JP5051050B2 - Control device for vehicle power transmission device - Google Patents

Description

  The present invention relates to a control device for a power transmission device for a vehicle, and relates to shift control during traveling of the vehicle.

A first electric motor, a second electric motor, a first rotating element connected to the first electric motor, a second rotating element connected to the second electric motor via a transmission shaft, and a third rotating element connected to the engine A stepped automatic transmission connected between the transmission shaft and the drive wheel, and a power storage device (battery) for charging and discharging the first motor and the second motor. 2. Description of the Related Art A vehicle power transmission device having the above has been conventionally known. This vehicle power transmission device is suitably used for a hybrid vehicle, for example, the vehicle power transmission device of Patent Document 1. In the control device for a vehicle power transmission device disclosed in Patent Document 1, during the shift of the automatic transmission, the rotational speed of the transmission shaft corresponding to the input shaft of the automatic transmission increases or decreases. The first electric motor and the second electric motor are controlled so as to keep the rotational speed of the engine as constant as possible by the differential action of the moving device. Specifically, the output torque (absolute value) of the first electric motor is temporarily reduced during shifting of the automatic transmission, particularly during upshifting.
JP 2007-118696 A

  The control device for a vehicle power transmission device disclosed in Patent Document 1 also controls the output torque of the second electric motor independently of controlling the output torque of the first electric motor during the shift of the automatic transmission. Therefore, during the speed change, the motor power balance, which is the total balance of input / output power of the first motor and the second motor, is not constant but varies with a certain range.

  Here, in order to facilitate understanding, for example, it is assumed that the operation of the second electric motor is restricted by the restriction on the electric power balance of the electric motor, and that the power storage device becomes unable to be charged / discharged for some reason. In that case, the electric power balance of the motor needs to be substantially zero, and during the shift of the automatic transmission, the output torque of the first motor is reduced in the same manner as in the case where the operation of the second motor is not limited by the restriction. If it is temporarily reduced, the input / output power of the first motor fluctuates according to the amount of decrease in the output torque, and the input / output power of the second motor, that is, the second electric power, according to the fluctuation. The output torque of the electric motor must be changed so that the electric motor power balance becomes substantially zero. That is, when a large restriction (limitation) occurs on the electric motor power balance due to a decrease in charge / discharge capacity of the power storage device for some reason, the input / output power of the first motor and the second electric motor Therefore, it is assumed that it is difficult to control the output torques of the first motor and the second motor independently of each other. In other words, it is assumed that the operation of the second electric motor is limited by restrictions on the electric motor power balance. Since the second motor is connected to the transmission shaft, the output torque change of the second motor due to the operation restriction of the second motor becomes the input torque change of the automatic transmission, and the input of the automatic transmission If the torque can independently control the output torques of the first motor and the second motor, respectively, and the operation of the second motor is not limited by restrictions on the motor power balance, for example, the power storage device operates the second motor. For example, the change rate of the input rotational speed of the automatic transmission during the inertia phase of the shift is a predetermined target. There is a possibility that the shift shock will increase due to deviation from the rate of change.

  For this reason, the control device of Patent Document 1 does not cause any particular problems if the fluctuation of the electric motor power balance is sufficiently absorbed by charging and discharging of the power storage device. On the other hand, there was a possibility that the shift shock would increase when a large restriction occurred. Such a problem is not yet known.

  The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a control device capable of reducing a shift shock during traveling in a vehicle power transmission device.

In order to achieve such an object, in the invention according to claim 1, (a) a differential mechanism connected between the engine and the drive wheels, and a first electric motor connected to the differential mechanism so as to transmit power. And an electric differential unit in which the differential state of the differential mechanism is controlled by controlling the operating state of the first electric motor, and a second electric motor coupled to the drive wheel so as to transmit power A control device for a vehicle power transmission device, comprising: a stepped transmission portion that constitutes a part of a power transmission path; and (b) the stepped transmission portion engages and releases a plurality of engagement devices. A stepped transmission that selectively establishes a plurality of shift speeds according to the speed change of the stepped speed change portion by switching the engagement devices, and (c) the stepped speed change portion. During the shifting of the motor, the reaction force torque of the first motor is reduced with respect to that before the shifting. Is provided with a torque control means, (d) the motor reaction torque control means, when the operation of the second electric motor is limited by constraints on balance of the input and output power of the first electric motor and a second electric motor According to the size of the restriction, the amount of decrease in the reaction torque before the shift is changed . (E) The operation of the second motor is a constraint on the balance of input / output power of the first motor and the second motor. The engagement pressure of the engagement device on the engagement side during the shift is increased according to the increase in the input torque of the stepped transmission unit caused by the decrease in the generated power of the second motor. It is characterized by including an engagement pressure control means for preferentially executing the increase in response to a change in the amount of decrease in the reaction force torque by the electric motor reaction force torque control means .

In the invention according to claim 2 , the motor reaction force torque control means is not so when the operation of the second motor is limited by the restriction on the balance of input / output power of the first motor and the second motor. The amount of decrease in the reaction torque of the first electric motor is reduced as compared with the case.

In the invention according to claim 3, when the operation of the second electric motor is limited by the restriction on the input / output power balance of the first electric motor and the second electric motor, the stepped speed change is distinguished from the case where it is not. It includes a shift control means that performs learning control of the engagement pressure of the part or does not perform the learning control.

In the invention according to claim 4 , the shift control means is implemented when the operation of the second electric motor is restricted by the restriction on the balance of input / output power of the first electric motor and the second electric motor, and when not so. The learning value obtained as a result of the learning control is used to determine the engagement pressure of the stepped transmission unit.

In the invention which concerns on Claim 5 , (a) The electrical storage apparatus which charges / discharges with respect to the said 1st motor and a 2nd motor is provided, (b) The said 1st motor and the 2nd motor are the said electrical storage apparatuses. The charging / discharging power is operated so as to be within a predetermined allowable range with respect to the charging / discharging power.

The invention according to claim 6 is characterized in that the first electric motor and the second electric motor are operated so that the temperatures of the first electric motor and the second electric motor are respectively equal to or lower than a predetermined allowable motor temperature. .

According to the control device for a vehicle power transmission device of the first aspect of the invention, the electric motor reaction force torque control means is configured such that the operation of the second electric motor is a balance of input / output electric power of the first electric motor and the second electric motor ( The amount of decrease in the reaction torque with respect to the stepped transmission before the shift is changed according to the size of the restriction when restricted by the restriction on the motor power balance). It is possible to reduce the operation shock of the second electric motor and reduce the shift shock.
According to the control device for a vehicle power transmission device according to the first aspect of the present invention, the engagement pressure control means included in the control device is configured such that the operation of the second motor is the first motor and the second motor. When the speed of the stepped transmission unit is being changed according to the increase in the input torque of the stepped transmission unit caused by the decrease in the generated power of the second motor. The engagement pressure (engagement side engagement pressure) of the engagement device on the engagement side is increased. Accordingly, an appropriate engagement-side engagement pressure corresponding to an increase in the input torque of the stepped transmission unit due to the operation restriction of the second electric motor is obtained, and thereby the stepped transmission unit of the stepped transmission unit is reduced so as to reduce the shift shock. It is possible to change the input rotation speed. That is, increasing the engagement-side engagement pressure during the shift acts in a direction to cancel the influence of the increase in the input torque on the rate of change in the input rotation speed.

  Here, preferably, the constraint on the motor power balance, which is the balance of input / output power (total balance) of the first motor and the second motor, is that at least one of the first motor and the second motor is , A condition that prevents generation or consumption of electric power required to reach a target operating state, or prevents such generation or consumption of electric power.

  Preferably, the case where the operation of the second electric motor is restricted is a case where the second electric motor cannot exhibit the target output torque.

  Preferably, in the upshifting of the stepped transmission unit, the motor reaction force torque control means limits the operation of the second motor when the operation of the second motor is limited by the constraint on the motor power balance. The amount of decrease in the reaction torque with respect to the stepped transmission before the shift is changed according to the magnitude of the stepped transmission. More preferably, the upshift is an inertia phase of the upshift.

  Preferably, when the first electric motor functions as a motor that consumes power and the second electric motor M2 is in a reverse power running state in which electric power is generated, the electric motor reaction force torque control means reduces the reaction force torque. Change the amount.

Also, preferably, the engaging pressure control means, the higher the operation of the second electric motor is greatly limited, the input torque of the step-variable shifting portion due to the decrease of the generated power is an output power of the second electric motor In accordance with the increase, the engagement side engagement pressure during the shift of the stepped transmission unit is increased.

According to the control device for a vehicle power transmission device of the invention according to claim 2 , the motor reaction force torque control means is configured such that the operation of the second motor is a balance of input / output power of the first motor and the second motor ( In the case where it is limited by the constraint on the electric motor power balance), the amount of decrease in the reaction torque of the first motor is reduced compared to the case where it is not so, the amount of decrease in the amount of decrease in the reaction torque is The operation restriction of the second motor due to the restriction on the electric power balance of the motor is relaxed, and as a result, the influence of the restriction on the change rate of the input rotation speed during the shift of the stepped transmission unit can be reduced.

According to the control device for a vehicle power transmission device of the invention according to claim 3 , the shift control means included in the control device is configured such that the operation of the second motor is the input / output power of the first motor and the second motor. If it is limited by the constraint on the balance of the balance, the learning control of the engagement pressure of the stepped transmission unit is performed separately from the case where it is not, or the learning control is not performed. In practice, it is possible to avoid the shift shock from becoming large and to implement appropriate learning control.

According to the control device for a vehicle power transmission device of the invention according to claim 4 , the shift control means is configured such that the operation of the second motor is limited by the restriction on the balance of input / output power of the first motor and the second motor. If so, the learning value obtained as a result of the learning control performed otherwise is used to determine the engagement pressure of the stepped transmission, so that the operation of the second electric motor is Even when the input / output power balance is rarely limited by the constraint on the input / output power balance, it is possible to determine the engagement pressure based on a sufficiently learned value, thereby reducing shift shock. Can be planned.

  Here, it is preferable that the shift control means determines the engagement-side engagement pressure by adding a predetermined engagement pressure correction value to the learning value. The engagement pressure correction value refers to the change in the input motor speed with respect to the rate of change in the input rotational speed of the stepped transmission when the operation of the second motor is limited by restrictions on the motor power balance. The correction value is set in advance so as to cancel the influence of the operation restriction. That is, the engagement pressure correction value is a correction that is set in advance so as to cancel the influence of the increase in the input torque of the stepped transmission unit due to the operation restriction of the second electric motor on the change rate of the input rotation speed. Value.

According to the control device for a vehicle power transmission device of the invention according to claim 5 , the first electric motor and the second electric motor are configured such that the charge / discharge power of the power storage device is determined in advance with respect to the charge / discharge power. Therefore, the durability of the power storage device and related electrical components can be maintained.

  Here, preferably, the predetermined allowable range for the charge / discharge power of the power storage device is an allowable charge / discharge power of the power storage device set for maintaining durability of the power storage device. It is a range (charge / discharge power allowable range).

According to the control device for a vehicle power transmission device of the invention according to claim 6 , the first motor and the second motor are such that the temperatures of the first motor and the second motor are respectively equal to or lower than a predetermined allowable motor temperature. Therefore, it is possible to maintain the durability of the first electric motor, the second electric motor, and components related to them.

  Here, preferably, the allowable electric motor temperature is an allowable temperature when operating the first electric motor and the second electric motor in order to prevent a decrease in durability of the first electric motor and the second electric motor. This is the upper limit value of the set temperature of the motor.

  Preferably, the second electric motor is connected to the input side of the stepped transmission unit so as to be able to transmit power so as to change the input rotation speed of the stepped transmission unit.

  Preferably, in the power transmission path between the engine and the drive wheel, the engine, the electric differential unit, the stepped transmission unit, and the drive wheel are connected in this order.

  Preferably, the differential mechanism includes a first rotating element coupled to the engine so as to transmit power, a second rotating element coupled to the first electric motor so as to transmit power, the drive wheel, A planetary gear device having a third rotating element coupled to the stepped transmission unit so as to be capable of transmitting power. The first rotating element is a carrier of the planetary gear device, the second rotating element is a sun gear of the planetary gear device, and the third rotating element is a ring gear of the planetary gear device. In this way, the axial direction dimension of the differential mechanism is reduced. Further, the differential mechanism is simply constituted by one planetary gear device.

  Preferably, the planetary gear device is a single pinion type planetary gear device. In this way, the axial direction dimension of the differential mechanism is reduced. Further, the differential mechanism is simply constituted by one single pinion type planetary gear device.

  Preferably, the overall transmission ratio of the vehicle power transmission device is formed based on the transmission ratio of the stepped transmission unit and the transmission ratio of the electric differential unit. In this way, a wide driving force can be obtained by using the gear ratio of the stepped transmission unit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The control device of the present invention is used in, for example, a hybrid vehicle. FIG. 1 is a skeleton diagram illustrating a vehicle power transmission device 10 (hereinafter, referred to as “power transmission device 10”) to which a control device of the present invention is applied. In FIG. 1, a power transmission device 10 includes an input shaft 14 as an input rotating member disposed on a common axis in a transmission case 12 (hereinafter referred to as “case 12”) as a non-rotating member attached to a vehicle body. And a differential portion 11 directly connected to the input shaft 14 or via a pulsation absorbing damper (vibration damping device) (not shown), and the differential portion 11 and the drive wheel 38 (see FIG. 6). An automatic transmission unit 20 connected in series via a transmission member (transmission shaft) 18 in the power transmission path between and an output shaft 22 as an output rotation member connected to the automatic transmission unit 20 in series. I have. As shown in FIG. 6, the power transmission device 10 includes an inverter 58 and a power storage device 60 that charges and discharges the first electric motor M <b> 1 and the second electric motor M <b> 2 via the inverter 58. The power transmission device 10 is preferably used for an FR (front engine / rear drive) type vehicle vertically installed in a vehicle, and directly to the input shaft 14 or directly via a pulsation absorbing damper (not shown). As a driving power source for traveling, for example, an engine 8 which is an internal combustion engine such as a gasoline engine or a diesel engine, and a pair of driving wheels 38 (see FIG. 6) are provided to drive the power from the engine 8. The transmission is transmitted to the left and right drive wheels 38 sequentially through a differential gear device (final reduction gear) 36 and a pair of axles that constitute a part of the transmission path.

  Thus, in the power transmission device 10 of the present embodiment, the engine 8 and the differential unit 11 are directly connected. This direct connection means that the connection is made without using a hydraulic power transmission device such as a torque converter or a fluid coupling. For example, the connection through the pulsation absorbing damper is included in this direct connection. Since the power transmission device 10 is configured symmetrically with respect to its axis, the lower side is omitted in the skeleton diagram of FIG.

  The differential unit 11 corresponding to the electric differential unit of the present invention is a mechanical mechanism that mechanically distributes the output of the engine 8 input to the input shaft 14, and outputs the output of the engine 8 to the first electric motor M <b> 1 and A power distribution mechanism 16 serving as a differential mechanism that distributes to the transmission member 18, a first electric motor M 1 that is coupled to the power distribution mechanism 16 so as to be able to transmit power, and an input side of the automatic transmission unit 20 of the automatic transmission unit 20. And a second electric motor M2 that is connected so as to be able to transmit power so as to change the input rotational speed and is provided to rotate integrally with the transmission member 18. The first motor M1 and the second motor M2 are so-called motor generators that also have a power generation function, but the first motor M1 that functions as a differential motor for controlling the differential state of the power distribution mechanism 16 is: At least a generator (power generation) function for generating a reaction force is provided. The second electric motor M2 connected to the drive wheel 38 so as to be able to transmit power is provided with at least a motor (electric motor) function in order to function as a traveling motor that outputs driving force as a driving force source for traveling. As shown in FIG. 1, since the second electric motor M2 is connected to the input side of the automatic transmission unit 20, the input torque of the automatic transmission unit 20 can be increased or decreased. Further, as shown in FIG. 6, the first electric motor M1 and the second electric motor M2 are provided in a case 12 as a casing of the power transmission device 10, and the power transmission device 10 (automatic transmission unit 20) is provided. Since the hydraulic oil functions as a coolant for the hydraulic oil by being sprayed on the first electric motor M1 and the second electric motor M2, the first electric motor M1 and the second electric motor M2 are detected by detecting the temperature of the hydraulic oil. Can be detected. Hereinafter, when the first electric motor M1 and the second electric motor M2 are not particularly distinguished from each other, they are simply expressed as “electric motor M”.

  The power distribution mechanism 16 corresponding to the differential mechanism of the present invention is a differential mechanism connected between the engine 8 and the drive wheel 38, and has a predetermined gear ratio ρ0 of about “0.418”, for example. A single pinion type differential planetary gear unit 24, a switching clutch C0 and a switching brake B0 are mainly provided. The differential unit planetary gear unit 24 includes a differential unit sun gear S0, a differential unit planetary gear P0, a differential unit carrier CA0 that supports the differential unit planetary gear P0 so as to rotate and revolve, and a differential unit planetary gear P0. The differential part ring gear R0 meshing with the differential part sun gear S0 is provided as a rotating element (element). If the number of teeth of the differential sun gear S0 is ZS0 and the number of teeth of the differential ring gear R0 is ZR0, the gear ratio ρ0 is ZS0 / ZR0.

In the power distribution mechanism 16, the differential carrier CA0 is connected to the input shaft 14, that is, the engine 8, the differential sun gear S0 is connected to the first electric motor M1, and the differential ring gear R0 is connected to the transmission member 18. ing. The switching brake B0 is provided between the differential sun gear S0 and the case 12, and the switching clutch C0 is provided between the differential sun gear S0 and the differential carrier CA0. When the switching clutch C0 and the switching brake B0 are released, the power distribution mechanism 16 includes a differential unit sun gear S0, a differential unit carrier CA0, and a differential unit ring gear R0, which are the three elements of the differential unit planetary gear unit 24, respectively. Since the differential action is enabled, that is, the differential action is activated, the output of the engine 8 is distributed to the first electric motor M1 and the transmission member 18, Since a part of the output of the distributed engine 8 is stored with electric energy generated from the first electric motor M1, or the second electric motor M2 is rotationally driven, the differential unit 11 (power distribution mechanism 16) is electrically For example, the differential unit 11 is set in a so-called continuously variable transmission state (electric CVT state) so that the transmission member 18 continuously rotates regardless of the predetermined rotation of the engine 8. It is varied. That is, when the power distribution mechanism 16 is in the differential state, the differential unit 11 is also in the differential state, and the differential unit 11 has its speed ratio γ0 (the rotational speed of the input shaft 14 / the rotational speed N _{18 of the} transmission member _18). ) Is a continuously variable transmission state that functions as an electrical continuously variable transmission that is continuously changed from the minimum value γ0min to the maximum value γ0max. When the power distribution mechanism 16 is set to the differential state in this way, the operation state of the first electric motor M1 and / or the second electric motor M2 connected to the power distribution mechanism 16 so as to be able to transmit power is controlled, so that the power The differential state of the distribution mechanism 16, that is, the differential state of the rotational speed of the input shaft 14 and the rotational speed N _{18 of the} transmission member ₁₈ (hereinafter referred to as “transmission member rotational speed N ₁₈ ”) is controlled.

In this state, when the switching clutch C0 or the switching brake B0 is engaged, the power distribution mechanism 16 does not perform the differential action, that is, enters a non-differential state where the differential action is impossible. Specifically, when the switching clutch C0 is engaged and the differential sun gear S0 and the differential carrier CA0 are integrally engaged, the power distribution mechanism 16 is connected to the differential planetary gear unit 24. Since the differential part sun gear S0, the differential part carrier CA0, and the differential part ring gear R0, which are the three elements, are all in a locked state where they are rotated, that is, integrally rotated, the differential action is disabled. The differential unit 11 is also in a non-differential state. In this non-differential state, the rotation of the engine 8 and the transmission member rotational speed N ₁₈ is matched, the differential portion 11 (power distributing mechanism 16) functions as a transmission the speed ratio γ0 is fixed to "1" constant A shift state, that is, a stepped shift state is set. Next, when the switching brake B0 is engaged instead of the switching clutch C0 and the differential sun gear S0 is connected to the case 12, the power distribution mechanism 16 locks the differential sun gear S0 in a non-rotating state. Since the differential action is impossible because the differential action is impossible, the differential unit 11 is also in the non-differential state. Further, since the differential portion ring gear R0 is rotated at a higher speed than the differential portion carrier CA0, the power distribution mechanism 16 functions as a speed increase mechanism, and the differential portion 11 (power distribution mechanism 16) has a gear ratio. A constant speed change state, that is, a stepped speed change state in which γ0 functions as a speed increasing transmission with a value smaller than “1”, for example, about 0.7, is set.

  Thus, in the present embodiment, the switching clutch C0 and the switching brake B0 change the shift state of the differential unit 11 (power distribution mechanism 16) between the differential state, that is, the non-locked state, and the non-differential state, that is, the locked state. That is, a differential state in which the differential unit 11 (power distribution mechanism 16) can be operated as an electric differential device, for example, an electric continuously variable transmission operation that operates as a continuously variable transmission whose speed ratio can be continuously changed is possible. A continuously variable transmission state and a gearless state in which an electric continuously variable transmission does not operate, for example, a lock state in which a continuously variable transmission operation is not operated without being operated as a continuously variable transmission, that is, one or more types are locked. A constant speed state (non-differential state) in which an electric continuously variable speed operation is not performed, that is, an electric continuously variable speed operation is not possible. one Functions as selectively switches the differential state switching device in the fixed-speed-ratio shifting state to operate as a transmission of one-stage or multi-stage.

The automatic transmission unit 20 corresponding to the stepped transmission unit of the present invention has a gear ratio γA (= transmission member rotation speed) by engaging and / or releasing a plurality of engagement devices (clutch C, brake B) included in the automatic transmission unit 20. N ₁₈ / rotational speed N _OUT of the output shaft 22) and a transmission unit that functions as a stepped automatic transmission capable of performing a shift that selectively establishes a plurality of shift stages. Switching of the gear position of the automatic transmission unit 20 is performed by holding the engaging device, that is, the automatic transmission unit 20 performs a so-called clutch-to-clutch shift. The automatic transmission unit 20 includes a single pinion type first planetary gear device 26, a single pinion type second planetary gear device 28, and a single pinion type third planetary gear device 30. The first planetary gear unit 26 includes a first sun gear S1, a first planetary gear P1, a first carrier CA1 that supports the first planetary gear P1 so as to rotate and revolve, and a first sun gear S1 via the first planetary gear P1. The first ring gear R1 meshing with the first gear R1 has a predetermined gear ratio ρ1 of about “0.562”, for example. The second planetary gear device 28 includes a second sun gear S2 via a second sun gear S2, a second planetary gear P2, a second carrier CA2 that supports the second planetary gear P2 so as to rotate and revolve, and a second planetary gear P2. The second ring gear R2 that meshes with the second gear R2 has a predetermined gear ratio ρ2 of about “0.425”, for example. The third planetary gear device 30 includes a third sun gear S3, a third planetary gear P3, a third carrier CA3 that supports the third planetary gear P3 so as to rotate and revolve, and a third sun gear S3 via the third planetary gear P3. A third ring gear R3 that meshes with the gear, and has a predetermined gear ratio ρ3 of about “0.421”, for example. The number of teeth of the first sun gear S1 is ZS1, the number of teeth of the first ring gear R1 is ZR1, the number of teeth of the second sun gear S2 is ZS2, the number of teeth of the second ring gear R2 is ZR2, the number of teeth of the third sun gear S3 is ZS3, If the number of teeth of the third ring gear R3 is ZR3, the gear ratio ρ1 is ZS1 / ZR1, the gear ratio ρ2 is ZS2 / ZR2, and the gear ratio ρ3 is ZS3 / ZR3.

  In the automatic transmission unit 20, the first sun gear S1 and the second sun gear S2 are integrally connected and selectively connected to the transmission member 18 via the second clutch C2 and the case 12 via the first brake B1. The first carrier CA1 is selectively connected to the case 12 via the second brake B2, the third ring gear R3 is selectively connected to the case 12 via the third brake B3, The first ring gear R1, the second carrier CA2, and the third carrier CA3 are integrally connected to the output shaft 22, and the second ring gear R2 and the third sun gear S3 are integrally connected to connect the first clutch C1. And selectively connected to the transmission member 18. As described above, the automatic transmission unit 20 and the transmission member 18 are selectively connected via the first clutch C1 or the second clutch C2 used to establish the gear position of the automatic transmission unit 20. In other words, the first clutch C1 and the second clutch C2 have a power transmission path between the transmission member 18 and the automatic transmission unit 20, that is, between the differential unit 11 (transmission member 18) and the drive wheel 38, with its power. It functions as an engagement device that selectively switches between a power transmission enabling state that enables power transmission on the transmission path and a power transmission cutoff state that interrupts power transmission on the power transmission path. That is, at least one of the first clutch C1 and the second clutch C2 is engaged so that the power transmission path can be transmitted, or the first clutch C1 and the second clutch C2 are disengaged. The power transmission path is in a power transmission cutoff state.

  The switching clutch C0, first clutch C1, second clutch C2, switching brake B0, first brake B1, second brake B2, and third brake B3 are often used in conventional stepped automatic transmissions for vehicles. A hydraulic friction engagement device (engagement device), a wet multi-plate type in which a plurality of friction plates stacked on each other are pressed by a hydraulic actuator, or one wound around the outer peripheral surface of a rotating drum Alternatively, one end of each of the two bands is configured by a band brake or the like that is tightened by a hydraulic actuator, and is for selectively connecting members on both sides on which the band is interposed.

In the power transmission device 10 configured as described above, for example, as shown in the engagement operation table of FIG. 2, the switching clutch C0, the first clutch C1, the second clutch C2, the switching brake B0, the first brake B1, second brake B2, and third brake B3 are selectively engaged and operated, so that any one of the first speed gear stage (first gear stage) to the fifth speed gear stage (fifth gear stage) is selected. Alternatively, the reverse gear stage (reverse gear stage) or neutral is selectively established, and the gear ratio γ (= input shaft rotational speed N _IN / output shaft rotational speed N _OUT ) that changes substantially is proportional to each gear stage. It has come to be obtained. In particular, in this embodiment, the power distribution mechanism 16 is provided with a switching clutch C0 and a switching brake B0, and the differential unit 11 is configured as described above when either the switching clutch C0 or the switching brake B0 is engaged. In addition to the continuously variable transmission state that operates as a continuously variable transmission, it is possible to configure a constant transmission state that operates as a transmission having a constant gear ratio. Therefore, in the power transmission device 10, the differential unit 11 and the automatic transmission unit 20 that are brought into the constant transmission state by engaging any of the switching clutch C 0 and the switching brake B 0 operate as a stepped transmission. A stepped speed change state is configured, and the differential part 11 and the automatic speed changer 20 that are brought into a continuously variable speed state by operating neither the switching clutch C0 nor the switching brake B0 are operated as an electric continuously variable transmission. A continuously variable transmission state is configured. In other words, the power transmission device 10 is switched to the step-shifted state by engaging any of the switching clutch C0 and the switching brake B0, and does not engage any of the switching clutch C0 and the switching brake B0. It is switched to the continuously variable transmission state. Further, it can be said that the differential unit 11 is also a transmission that can be switched between a stepped transmission state and a continuously variable transmission state.

  For example, when the power transmission device 10 functions as a stepped transmission, as shown in FIG. 2, the gear ratio γ1 is set to a maximum value, for example, due to the engagement of the switching clutch C0, the first clutch C1, and the third brake B3. A first gear that is approximately “3.357” is established, and the gear ratio γ2 is smaller than the first gear, for example, by engagement of the switching clutch C0, the first clutch C1, and the second brake B2. A second gear that is about "2.180" is established, and the gear ratio γ3 is smaller than the second gear, for example, by engagement of the switching clutch C0, the first clutch C1, and the first brake B1. For example, the third speed gear stage of about “1.424” is established, and the gear ratio γ4 is smaller than that of the third speed gear stage due to the engagement of the switching clutch C0, the first clutch C1, and the second clutch C2. The fourth speed gear stage which is about “1.000” is established, and the gear ratio γ5 is smaller than the fourth speed gear stage due to the engagement of the first clutch C1, the second clutch C2 and the switching brake B0. For example, the fifth gear stage which is about “0.705” is established. Further, by the engagement of the second clutch C2 and the third brake B3, the reverse gear stage in which the speed ratio γR is a value between the first speed gear stage and the second speed gear stage, for example, about “3.209” is established. Be made. When the neutral “N” state is set, for example, all clutches and brakes C0, C1, C2, B0, B1, B2, and B3 are released.

However, when the power transmission device 10 functions as a continuously variable transmission, both the switching clutch C0 and the switching brake B0 in the engagement table shown in FIG. 2 are released. Accordingly, the differential unit 11 functions as a continuously variable transmission, and the automatic transmission unit 20 in series with the differential unit 11 functions as a stepped transmission, whereby the first speed, the second speed, the third speed of the automatic transmission unit 20 , The rotational speed input to the automatic transmission unit 20 for each gear stage of the fourth speed, that is, the rotational speed N ₁₈ of the transmission member 18 is changed steplessly so that each gear stage has a stepless speed ratio width. Is obtained. Therefore, the gear ratio between the gear stages can be continuously changed continuously, and the total gear ratio (total gear ratio) γT of the power transmission device 10 as a whole can be obtained continuously.

FIG. 3 illustrates a gear stage in a power transmission device 10 including a differential unit 11 that functions as a continuously variable transmission unit or a first transmission unit and an automatic transmission unit 20 that functions as a stepped transmission unit or a second transmission unit. The collinear diagram which can represent on a straight line the relative relationship of the rotational speed of each rotation element from which a connection state differs for every is shown. The collinear diagram of FIG. 3 is a two-dimensional coordinate composed of a horizontal axis indicating the relationship of the gear ratio ρ of each planetary gear unit 24, 26, 28, 30 and a vertical axis indicating the relative rotational speed. shows the lower horizontal line X1 rotational speed zero of the horizontal lines, the upper horizontal line X2 the rotational speed of "1.0", that represents the rotational speed N _E of the engine 8 connected to the input shaft 14, horizontal line XG Indicates the rotational speed N ₁₈ of the transmission member 18.

  In addition, three vertical lines Y1, Y2, and Y3 corresponding to the three elements of the power distribution mechanism 16 constituting the differential unit 11 indicate the differential corresponding to the second rotation element (second element) RE2 in order from the left side. This shows the relative rotational speed of the differential part ring gear R0 corresponding to the part sun gear S0, the differential part carrier CA0 corresponding to the first rotational element (first element) RE1, and the third rotational element (third element) RE3. These intervals are determined according to the gear ratio ρ 0 of the differential planetary gear unit 24. Further, the five vertical lines Y4, Y5, Y6, Y7, Y8 of the automatic transmission unit 20 correspond to the fourth rotation element (fourth element) RE4 and are connected to each other in order from the left. And the second sun gear S2, the first carrier CA1 corresponding to the fifth rotation element (fifth element) RE5, the third ring gear R3 corresponding to the sixth rotation element (sixth element) RE6, the seventh rotation element ( Seventh element) The first ring gear R1, the second carrier CA2, and the third carrier CA3 corresponding to RE7 and connected to each other are connected to the eighth rotation element (eighth element) RE8 and connected to each other. The two ring gear R2 and the third sun gear S3 are respectively represented, and the distance between them is determined according to the gear ratios ρ1, ρ2, and ρ3 of the first, second, and third planetary gear devices 26, 28, and 30, respectively. In the relationship between the vertical axes of the nomogram, when the distance between the sun gear and the carrier is set to an interval corresponding to “1”, the interval between the carrier and the ring gear is set to an interval corresponding to the gear ratio ρ of the planetary gear device. That is, in the differential section 11, the interval between the vertical lines Y1 and Y2 is set to an interval corresponding to “1”, and the interval between the vertical lines Y2 and Y3 is set to an interval corresponding to the gear ratio ρ0. Further, in the automatic transmission unit 20, the space between the sun gear and the carrier is set at an interval corresponding to "1" for each of the first, second, and third planetary gear devices 26, 28, and 30, so that the carrier and the ring gear The interval is set to an interval corresponding to ρ.

  If expressed using the collinear diagram of FIG. 3 described above, the power transmission device 10 of the present embodiment is configured so that the power distribution mechanism 16 (differential unit 11) has the first rotating element RE1 ( The differential carrier CA0) is connected to the input shaft 14, that is, the engine 8, and is selectively connected to the second rotating element (differential sun gear S0) RE2 via the switching clutch C0, and the second rotating element RE2 is connected to the second rotating element RE2. 1 is connected to the electric motor M1 and selectively connected to the case 12 via the switching brake B0, and the third rotating element (differential ring gear R0) RE3 is connected to the transmission member 18 and the second electric motor M2 to be input. The rotation of the shaft 14 is transmitted (inputted) to the automatic transmission unit (stepped transmission unit) 20 via the transmission member 18. At this time, the relationship between the rotational speed of the differential section sun gear S0 and the rotational speed of the differential section ring gear R0 is shown by an oblique straight line L0 passing through the intersection of Y2 and X2.

For example, when the switching clutch C0 and the switching brake B0 are released to switch to a continuously variable transmission state (differential state), the intersection of the straight line L0 and the vertical line Y1 is controlled by controlling the rotational speed of the first electric motor M1. If the rotation speed of the differential portion ring gear R0 restrained by the vehicle speed V is substantially constant when the rotation of the differential portion sun gear S0 indicated by is increased or decreased, the intersection of the straight line L0 and the vertical line Y2 The rotational speed of the differential part carrier CA0 indicated by is increased or decreased. Further, when the differential part sun gear S0 and the differential part carrier CA0 are connected by the engagement of the switching clutch C0, the power distribution mechanism 16 is in a non-differential state in which the three rotation elements rotate integrally. L0 is aligned with the horizontal line X2, whereby the power transmitting member 18 is rotated at the same rotation to the engine speed N _E. Alternatively, when the rotation of the differential sun gear S0 is stopped by the engagement of the switching brake B0, the power distribution mechanism 16 is in a non-differential state that functions as a speed increasing mechanism, so that the straight line L0 is in the state shown in FIG. , the rotational speed N ₁₈ of the differential portion ring gear R0, i.e., the power transmitting member 18 represented by a point of intersection between the straight line L0 and the vertical line Y3 is input to the automatic shifting portion 20 at a rotation speed higher than the engine speed N _E The

  Further, in the automatic transmission unit 20, the fourth rotation element RE4 is selectively connected to the transmission member 18 via the second clutch C2, and is also selectively connected to the case 12 via the first brake B1, for the fifth rotation. The element RE5 is selectively connected to the case 12 via the second brake B2, the sixth rotating element RE6 is selectively connected to the case 12 via the third brake B3, and the seventh rotating element RE7 is connected to the output shaft 22. The eighth rotary element RE8 is selectively connected to the transmission member 18 via the first clutch C1.

In the automatic transmission unit 20, as shown in FIG. 3, when the first clutch C1 and the third brake B3 are engaged, the intersection of the vertical line Y8 indicating the rotational speed of the eighth rotation element RE8 and the horizontal line X2 And an oblique straight line L1 passing through the intersection of the vertical line Y6 indicating the rotational speed of the sixth rotational element RE6 and the horizontal line X1, and a vertical line Y7 indicating the rotational speed of the seventh rotational element RE7 connected to the output shaft 22. The rotational speed of the output shaft 22 of the first speed is shown at the intersection point. Similarly, at an intersection of an oblique straight line L2 determined by engaging the first clutch C1 and the second brake B2 and a vertical line Y7 indicating the rotational speed of the seventh rotating element RE7 connected to the output shaft 22. The rotational speed of the output shaft 22 at the second speed is shown, and an oblique straight line L3 determined by engaging the first clutch C1 and the first brake B1 and the seventh rotational element RE7 connected to the output shaft 22 The rotation speed of the output shaft 22 of the third speed is indicated by the intersection with the vertical line Y7 indicating the rotation speed, and the horizontal straight line L4 and the output shaft determined by engaging the first clutch C1 and the second clutch C2. The rotation speed of the output shaft 22 of the fourth speed is indicated by the intersection with the vertical line Y7 indicating the rotation speed of the seventh rotation element RE7 connected to the second rotation element RE7. Power from the aforementioned first speed through the fourth speed, as a result of the switching clutch C0 is engaged, the eighth rotary element RE8 differential portion 11 or power distributing mechanism 16 in the same rotational speed as the engine speed N _E Is entered. However, when the switching brake B0 in place of the switching clutch C0 is engaged, the drive force received from the differential portion 11 is input at a higher speed than the engine rotational speed N _E, first clutch C1, second The output shaft of the fifth speed at the intersection of the horizontal straight line L5 determined by engaging the clutch C2 and the switching brake B0 and the vertical line Y7 indicating the rotational speed of the seventh rotation element RE7 connected to the output shaft 22 A rotational speed of 22 is indicated.

  FIG. 4 illustrates a signal input to the electronic control device 40 that is a control device for controlling the power transmission device 10 according to the present invention and a signal output from the electronic control device 40. The electronic control unit 40 includes a so-called microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like, and performs signal processing in accordance with a program stored in advance in the ROM while using a temporary storage function of the RAM. By performing the above, drive control such as hybrid drive control relating to the engine 8, the first electric motor M1, and the second electric motor M2 and the shift control of the automatic transmission unit 20 is executed.

The electronic control unit 40 includes a signal indicating the engine water temperature TEMP _W , a signal indicating the shift position P _SH , a rotation speed N _{M1 of} the first electric motor _M1 (hereinafter referred to as “first electric motor”) from each sensor and switch shown in FIG. signal representative of) that the rotational speed _{N M1} ", the rotational speed _{N M2} of the second electric motor M2 (hereinafter," second electric motor speed _{N M2} "hereinafter) signal representing the engine speed _{N E} is the rotational speed of the engine 8 , A signal indicating a gear ratio train set value, a signal for instructing an M mode (manual shift travel mode), an air conditioner signal indicating the operation of an air conditioner, and a signal indicating a vehicle speed V corresponding to the rotational speed N _OUT of the output shaft 22 , An oil temperature signal indicating the operating oil temperature of the automatic transmission unit 20, a signal indicating a side brake operation, a signal indicating a foot brake operation, a catalyst temperature signal indicating a catalyst temperature, a driver output Accelerator opening signal indicating the amount of operation (accelerator opening) Acc of the accelerator pedal 41 corresponding to the required amount, cam angle signal, snow mode setting signal indicating snow mode setting, acceleration signal indicating vehicle longitudinal acceleration, auto cruise traveling An auto cruise signal indicating the vehicle weight, a vehicle weight signal indicating the weight of the vehicle, a wheel speed signal indicating the wheel speed of each wheel, a signal indicating the air-fuel ratio A / F of the engine 8, and the like are supplied.

Further, the electronic control device 40 sends a control signal to the engine output control device 43 (see FIG. 6) for controlling the engine output, for example, the opening degree θ _TH of the electronic throttle valve 96 provided in the intake pipe 95 of the engine 8. A drive signal to the throttle actuator 97 to be operated, a fuel supply amount signal for controlling the fuel supply amount into each cylinder of the engine 8 by the fuel injection device 98, an ignition signal for instructing the ignition timing of the engine 8 by the ignition device 99, A supercharging pressure adjustment signal for adjusting the supply pressure, an electric air conditioner drive signal for operating the electric air conditioner, a command signal for instructing the operation of the electric motors M1 and M2, and a shift position (operation position) for operating the shift indicator Display signal, gear ratio display signal for displaying gear ratio, snow motor for displaying that it is in snow mode Mode display signal, ABS operation signal for operating an ABS actuator for preventing wheel slippage during braking, an M mode display signal for indicating that the M mode is selected, the differential unit 11 and the automatic transmission unit 20 In order to control the hydraulic actuator of the hydraulic friction engagement device, a valve command signal for operating an electromagnetic valve included in the hydraulic control circuit 42 (see FIG. 6), and an electric hydraulic pump that is a hydraulic source of the hydraulic control circuit 42 are operated. A drive command signal for driving the motor, a signal for driving the electric heater, a signal to the cruise control computer, etc. are output.

FIG. 5 is a diagram showing an example of a shift operation device 48 as a switching device for switching a plurality of types of shift positions _PSH by an artificial operation. The shift operation device 48 includes, for example, a shift lever 49 that is disposed beside the driver's seat and is operated to select a plurality of types of shift positions _PSH .

  The shift lever 49 is in a neutral position where the power transmission path in the power transmission device 10, that is, in the automatic transmission unit 20 is interrupted, that is, in a neutral state, and is a parking position “P (” for locking the output shaft 22 of the automatic transmission unit 20. Parking) ”, reverse travel position“ R (reverse) ”for reverse travel, neutral position“ N (neutral) ”for achieving a neutral state in which the power transmission path in the power transmission device 10 is interrupted, power transmission device In the automatic shift control, a forward automatic shift travel position “D (drive)” for executing automatic shift control within a change range of 10 shiftable total gear ratios γT or a manual shift travel mode (manual mode) is established. Forward manual shift travel position “M (manual) for setting a so-called shift range that limits the high-speed gear position. It is provided so as to be manually operated to ".

The reverse gear "R" shown in the engagement operation table of FIG 2 in conjunction with the manual operation of the various shift positions P _SH of the shift lever 49, the neutral "N", the shift speed in forward gear "D" etc. For example, the hydraulic control circuit 42 is electrically switched so that is established.

In the shift positions P _SH shown in the “P” to “M” positions, the “P” position and the “N” position are non-traveling positions that are selected when the vehicle is not traveling. As shown in the combined operation table, the first clutch C1 that disables driving of the vehicle in which the power transmission path in the automatic transmission unit 20 in which both the first clutch C1 and the second clutch C2 are released is interrupted. This is a non-driving position for selecting switching to the power transmission cutoff state of the power transmission path by the second clutch C2. The “R” position, the “D” position, and the “M” position are travel positions that are selected when the vehicle travels. For example, as shown in the engagement operation table of FIG. And a power transmission path by the first clutch C1 and / or the second clutch C2 capable of driving a vehicle to which a power transmission path in the automatic transmission 20 is engaged so that at least one of the second clutch C2 is engaged. It is also a drive position for selecting switching to a power transmission enabled state.

  Specifically, when the shift lever 49 is manually operated from the “P” position or the “N” position to the “R” position, the second clutch C2 is engaged and the power transmission path in the automatic transmission unit 20 is changed. When the power transmission is cut off from the power transmission cut-off state and the shift lever 49 is manually operated from the “N” position to the “D” position, at least the first clutch C1 is engaged and the power in the automatic transmission unit 20 is increased. The transmission path is changed from a power transmission cutoff state to a power transmission enabled state. Further, when the shift lever 49 is manually operated from the “R” position to the “P” position or the “N” position, the second clutch C2 is released, and the power transmission path in the automatic transmission unit 20 is in a state where power transmission is possible. From the "D" position to the "N" position, the first clutch C1 and the second clutch C2 are released, and the power transmission in the automatic transmission unit 20 is performed. The path is changed from the power transmission enabled state to the power transmission cut-off state.

FIG. 6 is a functional block diagram illustrating the main part of the control function by the electronic control unit 40. In FIG. 6, the stepped shift control unit 54 functions as a shift control unit that shifts the automatic transmission unit 20. For example, the stepped shift control means 54 determines the vehicle speed V and the required output torque T _OUT of the automatic transmission unit 20 from the relationship (shift diagram, shift map) shown in FIG. Based on the vehicle state indicated by the above, it is determined whether or not the shift of the automatic transmission unit 20 should be executed, that is, the shift stage of the automatic transmission unit 20 to be shifted is determined, and the determined shift stage is obtained. Shifting of the automatic transmission unit 20 is executed. At this time, the stepped shift control means 54 engages and / or engages the hydraulic friction engagement device excluding the switching clutch C0 and the switching brake B0 so that the shift stage is achieved according to the engagement table shown in FIG. A release command (shift output command) is output to the hydraulic control circuit 42. The accelerator opening Acc and the required output torque T _OUT (vertical axis in FIG. 7) of the automatic transmission unit 20 have a correspondence relationship in which the required output torque T _OUT increases in accordance with the increase in the accelerator opening Acc. Therefore, the vertical axis of the shift diagram in FIG. 7 may be the accelerator opening Acc.

Further, the stepped shift control means 54 is a shift control means for causing the automatic transmission unit 20 to perform a so-called clutch-to-clutch shift, so that the input rotational speed N of the automatic transmission unit 20 during the inertia phase of the shift of the automatic transmission unit 20. ₁₈ (learning control for changing the engagement pressure of the friction engagement device (brake B, clutch C) of the automatic transmission unit 20 by learning so that the transmission speed ₁₈ (transmission member rotation speed N ₁₈ ) changes at a predetermined change rate Ani. To do. The predetermined change rate Ani is, for example, a shift of the automatic transmission 20 so that the input rotational speed N ₁₈ uniquely determined by the vehicle speed V and the transmission gear ratio γA of the automatic transmission 20 changes ideally. Among them, it is said that the change rate AN ₁₈ (= dN ₁₈ / dt) of the input rotational speed N ₁₈ is considered to have a good feeling, and that the speed change response and the speed change shock are easily suppressed. The input rotation of the automatic transmission unit 20 that realizes an ideal change state of the automatic transmission unit 20 that has been experimentally set in advance so that a moderate shift response with a small input rotation speed change rate AN ₁₈ can be achieved. is a speed rate of change _{aN 18.} The stepped shift control means 54 applies the engagement pressure after the learning control is performed to the next and subsequent shifts of the automatic transmission unit 20, and for this purpose, the engagement pressure after the learning control is performed as shown in FIG. The engagement pressure is stored as a hydraulic pressure learning value map (shift control value map).

FIG. 9 is an example of a hydraulic pressure learning value map, which is provided separately for upshifts and downshifts, where (a) is for upshifts and (b) is for downshifts. Further, the oil pressure learning value map shown in FIG. 9 is stratified according to its magnitude as shown by engine torques 1 to 7 and provided individually for each type of shift such as 1 → 2, 2 → 3, etc. Each hydraulic pressure learning value of the engagement pressure is stored in the storage means 56. For example, in a 1 → 2 upshift of the engine torque 1, the hydraulic pressure learning value of the disengagement side engagement device is Pb3u121, and the hydraulic pressure learning value of the engagement side engagement device is Pb2u121. Further, in this hydraulic pressure learning value map, the default values of the respective hydraulic pressure learning values experimentally obtained in advance are stored in, for example, the storage means 56, and the default is increased as the number of times of execution of learning control by the stepped shift control means 54 increases. The value is updated and rewritten to the latest hydraulic pressure learning value. The engine torque, for example, from a previously empirically sought stored relationship between the engine rotational speed N _E and the throttle valve opening theta _TH as a parameter and the estimated engine torque T _{E ',} the actual throttle valve opening theta _TH is calculated by the step-variable shifting control means 54 based on the engine rotational speed N _E and.

Note that the stepped shift control means 54 does not always perform the engagement pressure learning control for each shift of the automatic transmission unit 20, but performs the engagement pressure learning control when a predetermined learning precondition is satisfied. To implement. For example, change of the engine torque T _E during the shifting of the automatic shifting portion 20 is within a predetermined value, an engine coolant temperature TEMP _W that is warmed up the engine 8 is completed, the working oil of the automatic shifting portion 20 When the shift is normally executed and finished so that the temperature is within a predetermined appropriate value, the stepped shift control means 54 determines that the learning precondition is satisfied, and the engagement pressure learning control is performed. To implement.

The hybrid control means 52 operates the engine 8 in an efficient operating range in the continuously variable transmission state of the power transmission device 10, that is, the differential state of the differential unit 11, while driving the engine 8 and the second electric motor M2. The transmission ratio γ0 of the differential unit 11 as an electric continuously variable transmission is controlled by changing the force distribution and the reaction force generated by the first motor M1 so as to be optimized. For example, at the traveling vehicle speed at that time, the vehicle target (request) output is calculated from the accelerator pedal operation amount (accelerator opening) Acc and the vehicle speed V as the driver output request amount, and the vehicle target output and the charge request value are calculated. To calculate the required total target output, calculate the target engine output in consideration of transmission loss, auxiliary load, assist torque of the second electric motor M2, etc. so that the total target output can be obtained. so that the resulting engine speed N _E and engine torque T _E to control the amount of power generated by the first electric motor M1 controls the engine 8.

The hybrid control means 52 executes the control in consideration of the gear position of the automatic transmission unit 20 for improving power performance and fuel consumption. In such a hybrid control, align the rotational speed N ₁₈ of the power transmitting member 18 determined by the gear position of the engine rotational speed N _E and the vehicle speed V and the automatic transmission portion 20 determined to operate the engine 8 in an operating region at efficient Therefore, the differential unit 11 is caused to function as an electric continuously variable transmission. That is, the hybrid control means 52, for example, drivability when continuously-variable shifting control in the output torque in the two-dimensional coordinates to the (engine torque) T _E parameters of the engine rotational speed N _E and the engine 8 as shown in FIG. 8 An optimum fuel consumption rate curve L _EF (fuel consumption map, relationship), which is a kind of operation curve of the engine 8 that has been experimentally determined in advance so as to achieve both fuel efficiency and fuel efficiency, is stored in advance, and the optimum fuel consumption rate curve L For example, the target output (total target output, required driving force) is satisfied so that the engine 8 can be operated while the operating point P _EG of the engine 8 (hereinafter referred to as “engine operating point P _EG ”) is aligned with the _EF. Target value of the total gear ratio γT of the power transmission device 10 so that the engine torque T _E and the engine rotation speed N _E for generating the engine output necessary for this are obtained. And the gear ratio γ0 of the differential section 11 is controlled so that the target value is obtained, and the total gear ratio γT is controlled within the changeable range of the gearshift, for example, in the range of 13 to 0.5. Here, the above-mentioned engine operating point P _EG, the operating state of the engine 8 in the engine rotational speed N _E and the two-dimensional coordinates with coordinate axes state quantity indicating the operating state of the engine 8 is exemplified by such engine torque T _E This is the operating point shown.

  At this time, the hybrid control means 52 supplies the electric energy generated by the first electric motor M1 to the power storage device 60 and the second electric motor M2 through the inverter 58, so that the main part of the power of the engine 8 is mechanically transmitted. However, a part of the motive power of the engine 8 is consumed for power generation of the first electric motor M1 and converted into electric energy there, and the electric energy is supplied to the second electric motor M2 through the inverter 58. The second electric motor M2 is driven and transmitted from the second electric motor M2 to the transmission member 18. An electric path from conversion of a part of the power of the engine 8 into electric energy and conversion of the electric energy into mechanical energy by a device related from the generation of the electric energy to consumption by the second electric motor M2 Composed.

The hybrid control means 52 controls opening and closing of the electronic throttle valve 96 by the throttle actuator 97 for throttle control, and also controls the fuel injection amount and injection timing by the fuel injection device 98 for fuel injection control, and controls the ignition timing control. Therefore, an engine output control for executing the output control of the engine 8 so as to generate a necessary engine output by outputting to the engine output control device 43 a command for controlling the ignition timing by the ignition device 99 such as an igniter alone or in combination. Means are provided functionally. For example, the hybrid controller 52 basically drives the throttle actuator 97 based on the accelerator opening signal Acc from a previously stored relationship (not shown), and increases the throttle valve opening θ _TH as the accelerator opening Acc increases. Execute throttle control to increase.

The solid line A in FIG. 7 indicates that the driving force source for starting / running the vehicle (hereinafter referred to as running) is switched between the engine 8 and the electric motor, for example, the second electric motor M2, in other words, driving the engine 8 for running. Engine running region and motor running for switching between so-called engine running for starting / running (hereinafter referred to as running) the vehicle as a power source and so-called motor running for running the vehicle using the second electric motor M2 as a driving power source for running. This is the boundary line with the region. The pre-stored relationship having a boundary line (solid line A) for switching between engine running and motor running shown in FIG. 7 is a two-dimensional parameter using vehicle speed V and output torque T _{OUT as} a driving force related value as parameters. It is an example of the driving force source switching diagram (driving force source map) comprised by the coordinate. This driving force source switching diagram is stored in advance in the storage means 56 together with a shift diagram (shift map) indicated by, for example, the solid line and the alternate long and short dash line in FIG.

Then, the hybrid control means 52 determines whether the motor travel region or the engine travel region is based on the vehicle state indicated by the vehicle speed V and the required output torque T _OUT from the driving force source switching diagram of FIG. Judgment is made and motor running or engine running is executed. As described above, as shown in FIG. 7, the motor running by the hybrid control means 52 is generally performed at a relatively low output torque T _OUT , that is, when the engine efficiency is low compared to the high torque range, that is, the low engine torque T. It is executed at _E or when the vehicle speed V is relatively low, that is, in a low load range.

The hybrid control means 52 rotates the first electric motor by the electric CVT function (differential action) of the differential section 11 in order to suppress dragging of the stopped engine 8 and improve fuel consumption during the motor running. the speed N _M1 controlled for example by idling a negative rotational speed, to maintain the engine speed N _E at zero or substantially zero by the differential action of the differential portion 11.

  The hybrid control means 52 switches an engine start / stop control means 66 for switching the operation state of the engine 8 between the operation state and the stop state, that is, for starting and stopping the engine 8 in order to switch between engine travel and motor travel. I have. The engine start / stop control means 66 starts or stops the engine 8 when the hybrid control means 52 determines, for example, switching between motor travel and engine travel based on the vehicle state from the driving force source switching diagram of FIG. Execute.

For example, the engine start / stop control means 66, as indicated by the point a → the point b of the solid line B in FIG. 7, the accelerator pedal 41 is depressed to increase the required output torque T _OUT and the vehicle state changes from the motor travel region to the engine. when the changes to the running region, by raising the first electric motor speed N _M1 is energized to the first electric motor M1, i.e. it to function first electric motor M1 as a starter, raising the engine rotational speed N _E, performing starting of the engine 8 so as to ignite a predetermined engine speed N _{E 'for} example autonomous rotatable engine speed N _E at the ignition device 99, switching from the motor running by the hybrid control means 52 to the engine running. At this time, engine start stop control means 66 may be pulled up until the engine rotational speed N _E promptly predetermined engine rotational speed N _{E 'by} raising the first electric motor speed N _M1 quickly. Thereby, the resonance region in the engine rotation speed region below the well-known idle rotation speed N _EIDL can be quickly avoided, and the vibration at the start is suppressed.

Further, the engine start / stop control means 66, as indicated by the point b → point a of the solid line B in FIG. 7, the accelerator pedal 41 is returned to reduce the required output torque T _OUT and the vehicle state changes from the engine travel region to the motor travel. In the case of changing to the region, the fuel supply is stopped by the fuel injection device 98, that is, the engine 8 is stopped by fuel cut, and the engine traveling by the hybrid control means 52 is switched to the motor traveling. At this time, engine start stop control means 66 may lower the engine rotational speed N _E to promptly zeroed or nearly zeroed by lowering the first electric motor speed N _M1 quickly. As a result, the resonance region can be quickly avoided, and vibration during stoppage is suppressed. Alternatively, engine start stop control means 66, before the fuel cut lower the engine rotational speed N _E by pulling down the first electric motor speed N _M1, the engine to the fuel cut at a predetermined engine speed N _{E '8} May be stopped.

  Further, even in the engine travel region, the hybrid control means 52 supplies the second motor M2 with the electric energy from the first electric motor M1 and / or the electric energy from the power storage device 60 by the electric path described above. 2 Torque assist that assists the power of the engine 8 by driving the electric motor M2 is possible. Therefore, in the present embodiment, the traveling of the vehicle using both the engine 8 and the second electric motor M2 as a driving force source for traveling is included in the engine traveling instead of the motor traveling.

Further, the hybrid control means 52 can maintain the operating state of the engine 8 by the electric CVT function of the differential section 11 regardless of whether the vehicle is stopped or at a low vehicle speed. For example, when the remaining charge SOC of the power storage device 60 decreases when the vehicle is stopped and the first motor M1 needs to generate power, the first motor M1 is generated by the power of the engine 8 and the first motor is generated. Even if the rotation speed of M1 is increased and the second motor rotation speed N _M2 uniquely determined by the vehicle speed V becomes zero (substantially zero) when the vehicle is stopped, the engine rotation speed N is caused by the differential action of the power distribution mechanism 16. _E is maintained above the rotational speed at which autonomous rotation is possible.

Further, the hybrid control means 52 controls the first motor rotation speed N _M1 and / or the second motor rotation speed N _M2 by the electric CVT function of the differential section 11 regardless of whether the vehicle is stopped or traveling. the engine rotational speed N _E is caused to maintain the arbitrary rotation speed. For example, if the hybrid control means 52 as can be seen from the diagram of FIG. 3 to raise the engine rotational speed N _E, while maintaining the second-motor rotation speed N _M2, bound with the vehicle speed V substantially constant first 1 Increase the motor rotation speed _NM1 .

  The speed-increasing gear stage determining means 62 stores, for example, based on the vehicle state in order to determine which of the switching clutch C0 and the switching brake B0 is to be engaged when the power transmission device 10 is in the stepped shift state. In accordance with the shift diagram shown in FIG. 7 stored in advance in the means 56, it is determined whether or not the gear position to be shifted of the power transmission device 10 is the speed increasing side gear stage, for example, the fifth speed gear stage.

The switching control means 50 switches between the continuously variable transmission state and the stepped transmission state by switching engagement / release of the differential state switching device (switching clutch C0, switching brake B0) based on the vehicle state. That is, the differential state and the lock state are selectively switched. For example, the switching control means 50 is a vehicle state indicated by the vehicle speed V and the required output torque T _{OUT based} on the relationship (switching diagram, switching map) shown in FIG. Based on the above, it is determined whether or not the speed change state of the power transmission device 10 (differential unit 11) should be switched, that is, the power transmission device 10 is in a continuously variable control region where the power transmission device 10 is in a continuously variable speed state or power By determining whether the transmission device 10 is in the stepped control region where the stepped gear shift state is set, the shift state of the power transmission device 10 to be switched is determined, and the power transmission device 10 is switched between the stepless shift state and the stepped shift state. The shift state is selectively switched to either the step shift state.

  Specifically, when it is determined that the switching control means 50 is within the stepped shift control region, the hybrid control means 52 outputs a signal that disables or prohibits the hybrid control or continuously variable shift control. The step-variable shift control means 54 is allowed to shift at a preset step-change. At this time, the stepped shift control means 54 executes the automatic shift of the automatic transmission unit 20 in accordance with, for example, the shift diagram shown in FIG. For example, FIG. 2 preliminarily stored in the storage means 56 shows a combination of operations of the hydraulic friction engagement devices, that is, C0, C1, C2, B0, B1, B2, and B3 that are selected in the shifting at this time. That is, the entire power transmission device 10, that is, the differential unit 11 and the automatic transmission unit 20 function as a so-called stepped automatic transmission, and the gear stage is achieved according to the engagement table shown in FIG.

  For example, when the fifth speed gear stage is determined by the acceleration side gear stage determination means 62, the so-called overdrive gear stage in which the speed ratio is smaller than 1.0 is obtained for the entire power transmission device 10. Therefore, the switching control means 50 releases the switching clutch C0 and engages the switching brake B0 so that the differential unit 11 can function as a sub-transmission having a fixed gear ratio γ0, for example, a gear ratio γ0 of 0.7. The command is output to the hydraulic control circuit 42. Further, when it is determined by the acceleration side gear stage determination means 62 that it is not the fifth speed gear stage, the switching control is performed in order to obtain a reduction side gear stage having a gear ratio of 1.0 or more as the entire power transmission device 10. The means 50 instructs the hydraulic control circuit 42 to engage the switching clutch C0 and release the switching brake B0 so that the differential unit 11 can function as a sub-transmission with a fixed gear ratio γ0, for example, a gear ratio γ0 of 1. Output. As described above, the power transmission device 10 is switched to the stepped shift state by the switching control means 50, and is selectively switched to be one of the two types of shift steps in the stepped shift state. 11 is made to function as a sub-transmission, and the automatic transmission unit 20 in series with it functions as a stepped transmission, whereby the entire power transmission device 10 is made to function as a so-called stepped automatic transmission.

However, if the switching control means 50 determines that it is within the continuously variable transmission control region for switching the power transmission device 10 to the continuously variable transmission state, the power transmission device 10 as a whole can obtain the continuously variable transmission state. A command for releasing the switching clutch C0 and the switching brake B0 is output to the hydraulic control circuit 42 so that the section 11 is in a continuously variable transmission state and can be continuously variable. At the same time, a signal for permitting hybrid control is output to the hybrid control means 52, and a signal for fixing to a preset gear position at the time of continuously variable transmission is output to the stepped shift control means 54, or For example, a signal for permitting automatic shifting of the automatic transmission unit 20 is output in accordance with the shift diagram shown in FIG. In this case, the stepped shift control means 54 performs an automatic shift by an operation excluding the engagement of the switching clutch C0 and the switching brake B0 in the engagement table of FIG. Thus, the differential unit 11 switched to the continuously variable transmission state by the switching control means 50 functions as a continuously variable transmission, and the automatic transmission unit 20 in series with the differential unit 11 functions as a stepped transmission. At the same time that a large driving force is obtained, the rotational speed input to the automatic transmission unit 20 for each of the first speed, the second speed, the third speed, and the fourth speed of the automatic transmission unit 20, that is, transmission rotational speed N ₁₈ of the member 18 each gear is varied continuously variable manner is that the speed ratio of can be obtained. Therefore, the gear ratio between the gears is continuously variable and the power transmission device 10 as a whole is in a continuously variable transmission state, and the total gear ratio γT can be obtained continuously.

Here, FIG. 7 will be described in detail. FIG. 7 is a relationship (shift diagram, shift map) stored in advance in the storage means 56 that is the basis of the shift determination of the automatic transmission unit 20, and relates to vehicle speed V and driving force. FIG. 5 is an example of a shift diagram composed of two-dimensional coordinates using a required output torque T _OUT as a parameter. The solid line in FIG. 7 is an upshift line, and the alternate long and short dash line is a downshift line.

7 indicates the determination vehicle speed V1 and the determination output torque T1 for determining the stepped control region and the stepless control region by the switching control means 50. That is, the broken line in FIG. 7 indicates a high vehicle speed determination line that is a series of determination vehicle speeds V1 that are preset high-speed traveling determination values for determining high-speed traveling of the hybrid vehicle, and a driving force related to the driving force of the hybrid vehicle. For example, a high output travel determination line that is a series of determination output torque T1 that is a preset high output travel determination value for determining high output travel in which the output torque T _OUT of the automatic transmission unit 20 is high output. Is shown. Further, as indicated by a two-dot chain line with respect to the broken line in FIG. 7, hysteresis is provided for the determination of the stepped control region and the stepless control region. In other words, the area or FIG. 7 includes a vehicle-speed limit V1 and the upper output torque T1, which one of the step-variable control region and the continuously variable control region by switching control means 50 and an output torque T _OUT with the vehicle speed V as a parameter It is the switching diagram (switching map, relationship) memorize | stored beforehand for determination. In addition, you may memorize | store in the memory | storage means 56 previously as a shift map including this switching diagram. Further, this switching diagram may include at least one of the determination vehicle speed V1 and the determination output torque T1, or is a switching line stored in advance using either the vehicle speed V or the output torque T _OUT as a parameter. There may be.

The shift diagram, the switching diagram, or the driving force source switching diagram is not a map but a judgment formula for comparing the actual vehicle speed V with the judgment vehicle speed V1, and comparing the output torque T _OUT with the judgment output torque T1. May be stored as a determination formula or the like. In this case, the switching control means 50 sets the power transmission device 10 to the stepped speed change state when the vehicle state, for example, the actual vehicle speed exceeds the determination vehicle speed V1. Further, the switching control means 50 places the power transmission device 10 in the stepped gear shift state when the vehicle state, for example, the output torque T _OUT of the automatic transmission unit 20 exceeds the determination output torque T1.

  In addition, when the control unit of an electric system such as an electric motor for operating the differential unit 11 as an electric continuously variable transmission is malfunctioning or deteriorated, for example, the electric energy is generated from the generation of electric energy in the first electric motor M1. Degradation of equipment related to the electrical path until it is converted into dynamic energy, that is, failure (failure) of the first electric motor M1, the second electric motor M2, the inverter 58, the power storage device 60, the transmission line connecting them, etc. When the vehicle state is such that a function deterioration due to low temperature occurs, the switching control means 50 preferentially places the power transmission device 10 in the stepped shift state in order to ensure vehicle travel even in the continuously variable control region. It is good.

The driving force-related value is a parameter corresponding to the driving force of the vehicle on a one-to-one basis, and includes not only the driving torque or driving force at the driving wheels 38 but also the output torque T _OUT of the automatic transmission unit 20, engine torque T _E, and the vehicle acceleration, for example, the accelerator opening or the throttle valve opening theta _{TH (or} intake air quantity, air-fuel ratio, fuel injection amount) and the engine torque T _E which is calculated based on the engine rotational speed N _E, etc. Required (target) engine torque T _E calculated based on the actual value of the driver, the accelerator pedal operation amount or the throttle opening, etc., the required (target) output torque T _{OUT of} the automatic transmission unit 20, the required driving force, etc. May be an estimated value. The driving torque may be calculated from the output torque T _OUT or the like in consideration of the differential ratio, the radius of the driving wheel 38, or may be directly detected by, for example, a torque sensor or the like. The same applies to the other torques described above.

  Further, for example, the determination vehicle speed V1 is set so that the power transmission device 10 is in the stepped speed change state at the high speed so that the fuel consumption is prevented from deteriorating when the power transmission device 10 is in the stepless speed change state at the high speed travel. Is set to be. The determination torque T1 is, for example, an electric power from the first electric motor M1 in order to reduce the size of the first electric motor M1 without causing the reaction torque of the first electric motor M1 to correspond to the high output range of the engine in the high output traveling of the vehicle. It is set in accordance with the characteristics of the first electric motor M1 that can be disposed with a reduced maximum energy output.

As shown in the relationship of FIG. 7, the stepped control region is a high torque region where the output torque T _OUT is equal to or higher than the predetermined determination output torque T1, or a high vehicle velocity region where the vehicle speed V is equal to or higher than the predetermined determination vehicle speed V1. Therefore, the step-variable traveling is executed at the time of a high driving torque at which the engine 8 has a relatively high torque or at a relatively high vehicle speed, and the continuously variable speed traveling is performed at a relatively low torque of the engine 8. The engine 8 is executed at a low driving torque or at a relatively low vehicle speed, that is, in a normal output range of the engine 8.

As a result, for example, when the vehicle is traveling at low to medium speed and at low to medium power, the power transmission device 10 is set to a continuously variable transmission state to ensure the fuel efficiency of the vehicle, but the actual vehicle speed V is equal to the determination vehicle speed V1. In high-speed running exceeding this, the power transmission device 10 is in a stepped speed change state in which it operates as a stepped transmission, and the output of the engine 8 is transmitted to the drive wheels 38 exclusively through a mechanical power transmission path. Conversion loss between power and electric energy generated when operating as a transmission is suppressed, and fuel efficiency is improved. Further, in high output traveling such that the driving force related value such as the output torque T _OUT exceeds the determination torque T1, the power transmission device 10 is set to a stepped transmission state in which it operates as a stepped transmission, and mechanical power transmission is exclusively performed. The region in which the output of the engine 8 is transmitted to the drive wheels 38 through the route to operate as an electric continuously variable transmission is the low / medium speed travel and the low / medium power travel of the vehicle, and the first motor M1 should generate electricity. In other words, the maximum value of the electric energy transmitted by the first electric motor M1 can be reduced, and the first electric motor M1 or a vehicle driving device including the first electric motor M1 can be further downsized. As another concept, in this high-power running, the demand for the driver's driving force is more important than the demand for fuel consumption, so that the stepless speed change state is switched to the stepped speed change state (constant speed change state). Thus, the user, for example, changes i.e. changes in the rhythmic engine rotational speed N _E due to the shift of the engine speed N _E accompanying the upshift in the stepped automatic transmission cars can enjoy.

  Thus, the differential section 11 (power transmission device 10) of this embodiment can be selectively switched between the continuously variable transmission state and the stepped transmission state (constant transmission state), and is controlled by the switching control means 50. A shift state to be switched by the differential unit 11 is determined based on the vehicle state, and the differential unit 11 is selectively switched between a continuously variable transmission state and a stepped transmission state. In this embodiment, the hybrid control means 52 executes motor travel or engine travel based on the vehicle state. In order to switch between engine travel and motor travel, the engine start / stop control means 66 controls the engine 8. Starts or stops.

In addition to the functions described above, the hybrid control means 52 outputs the output torque T _M1 (hereinafter referred to as “first motor torque T _M1 ”) of the first electric motor M1 during the shift of the automatic transmission unit 20 and the output of the second electric motor M2. An electric motor control means 68 for controlling the torque T _M2 (hereinafter referred to as “second electric motor torque T _M2 ”) is provided. The motor control means 68, when the shifting of the automatic shifting portion 20 has been performed, as the shift shock is not possible occurs, the second-motor torque T _M2 in the inertia phase in the shift from the pre-shift torque The speed is changed to the target torque after the shift determined by the vehicle speed V, the accelerator opening degree Acc, and the like. For example, the second motor torque T _M2 is changed as smoothly as possible within the inertia phase, for example, to the target torque after the shift so that the fluctuation range of the change rate of the second motor torque T _M2 is as small as possible. Let me. The motor control means 68 is different from the above when the operation of the second motor M2 is restricted by the restriction on the motor power balance Wm that is the total balance of the input / output power of the first motor M1 and the second motor M2. The second motor torque _TM2 may be changed, which will be described later. Here, the input power of the motor M is the power consumption of the motor M, and the output power of the motor M is the generated power of the motor M.

Furthermore, in the inertia phase of the upshift of the automatic transmission portion 20 is lowered the input rotation speed N ₁₈ is transmitting member rotational speed N ₁₈ of the automatic transmission portion 20, increasing the transmission member rotational speed N ₁₈ is the inertia phase of the downshift to place, for such to suppress the sense of discomfort given to the passenger, the motor control unit 68 in the inertia phase of the shift of the automatic shifting portion 20 so as to suppress a change in the engine rotational speed N _E, that is, the engine rotation speed as keep the N _E constant, to control the first electric motor torque _{T M1.} For example, motor control means 68, during the shifting of the automatic shifting portion 20, in particular, the inertia phase of the upshift, the first electric motor torque T _M1 so as to suppress the change in the engine rotational speed N _E pre-shift ( The control is performed to reduce the speed before the shift is started. Thus, the motor control means 68, the shift in the automatic shifting portion 20 (during an upshift), the first electric motor torque T _{M1 (absolute} value) as the reaction torque for the engine torque T _E to pre-shift Therefore, it can be said that it functions as a motor reaction force torque control means.

  Further, when there is a restriction on the electric motor power balance Wm of the first electric motor M1 and the second electric motor M2 due to a decrease in charge / discharge capability of the power storage device 60, the electric motor control means 68 The input / output powers of the first electric motor M1 and the second electric motor M2 are adjusted so that the electric motor power balance Wm falls within the above-mentioned restriction range. For example, in the case where the above restriction occurs, if the input / output power of the first electric motor M1 is changed by executing the reaction force torque down control, the operation of the second electric motor M2 is limited as necessary. Thus, the input / output power of the second electric motor M2 is adjusted according to the change in the input / output power of the first electric motor M1.

  For example, when the accelerator pedal 41 is depressed greatly, the second electric motor M2 may generate power and the first electric motor M1 may be in a reverse power running state where power is consumed. In such a reverse power running state, when the motor control means 68 reduces the power consumption (input power) of the first motor M1 by executing the reaction force torque down control, the motor power balance Wm The generated electric power (output electric power) of the second electric motor M2 is reduced within a necessary range so as to be within the range of restrictions on it. In this way, the motor control means 68 balances the input / output power between the first motor M1 and the second motor M2, so that the motor power balance Wm is within the above-mentioned constraints. And the 2nd electric motor M2 is operated.

By the way, with respect to the temperatures of the first motor M1 and the second motor M2, the first motor M1 and the second motor M2 set so as to maintain the durability of the first motor M1 and the second motor M2 are operated. A motor allowable temperature L _TM is provided as an upper limit temperature that is sometimes allowed. The first motor M1 and the second motor M2 are operated so as to be equal to or lower than the motor allowable temperature _LTM . In addition, a permissible range W _{IN / OUT} (charge / discharge power permissible range W _{IN / OUT} ) set so as to maintain the durability of the power storage device 60 is provided for the charge / discharge power of the power storage device 60. In order to maintain the durability of the power storage device 60, etc., the motor control means 68 uses the first motor M1 and the second motor so that the charge / discharge power of the power storage device 60 falls within the charge / discharge power allowable range W _{IN / OUT} . The electric motor M2 is operated. For example, when the charge / discharge power allowable range W _{IN / OUT} becomes small (narrow) due to the extremely low temperature of the power storage device 60, the motor power balance Wm is thereby largely restricted, and the motor power It is conceivable that the input / output power of the first electric motor M1 and the input / output electric power of the second electric motor M2 are mutually restricted due to the restriction on the balance Wm, that is, the operation of the second electric motor M2 is restricted by the restriction. . When so that operation of the second electric motor M2 is limited, as may the second motor M2 changes the input rotational speed N ₁₈ of the input side to the automatic transmission portion 20 of the automatic shifting portion 20 as shown in FIG. 1 Therefore, it is assumed that the input rotational speed change rate AN _{18 of} the automatic transmission unit 20 deviates from the target predetermined change rate Ani, thereby causing a shift shock.

On the other hand, in the present embodiment, the engagement pressure of the engagement device (clutch C, brake B) on the engagement side during the shift of the automatic transmission unit 20 so as to suppress such a shift shock, that is, the engagement side. The engagement pressure is adjusted, and the input / output power of the first motor M1 and the second motor M2, that is, the first motor torque T _M1 and the second motor torque T _M2 are adjusted. Hereinafter, the main part of the control function will be described.

  The shift occurrence determination means 70 in FIG. 6 determines whether or not the shift of the automatic transmission unit 20 has occurred, in other words, whether or not the shift of the automatic transmission unit 20 has started. For example, when the stepped shift control unit 54 outputs the shift output command for shifting the automatic transmission unit 20 to the hydraulic control circuit 42, the shift generation determination unit 70 indicates that the shift of the automatic transmission unit 20 has occurred. Affirm. Preferably, the shift occurrence determination means 70 determines whether or not an upshift of the automatic transmission unit 20 has started (whether or not it has occurred).

The power balance restriction determination unit 72 determines whether or not the operation of the second electric motor M2 is restricted by the restriction on the electric motor power balance Wm. The restriction on the electric motor power balance Wm is necessary for at least one of the first electric motor M1 and the second electric motor M2 to enter a target operating state such as exerting a target electric motor torque. It is a condition that prevents generation or consumption of power, or prevents generation or consumption of power as such. Further, the case where the operation of the second electric motor M2 is restricted is a case where the second electric motor M2 cannot exhibit the target output torque _TM2 . For example, when the charge / discharge power allowable range W _{IN / OUT of the} power storage device 60 becomes small due to the extremely low temperature of the power storage device 60, or when the first motor M1 and the second motor M2 become high temperature. when margin for the electric motor allowable temperature L _TM of the electric motor temperature is small, restrictions with respect to the motor power balance Wm is increased. For example, the power balance constraint determination means 72 calculates the motor power balance Wm required at that time from the target operating states of the first motor M1 and the second motor M2, and the calculated motor power balance Wm is generated. If the charge / discharge power of the power storage device 60 deviates from the charge / discharge power allowable range W _{IN / OUT,} it is determined that the operation of the second electric motor M2 is limited. Further, when the calculated motor power balance Wm is generated, if the temperature of the second motor M2 exceeds the motor allowable temperature _LTM , it is determined that the operation of the second motor M2 is limited.

The motor control means 68 (motor reaction force torque control means 68) has a decrease amount DT _M1 (hereinafter referred to as “the first torque reduction) of the first motor torque (reaction torque) T _M1 with respect to the automatic transmission 20 before shifting, in addition to the above-described functions. 1 motor torque reduction amount DT _M1 ), that is, the first motor torque reduction amount DT _M1 in the reaction force torque down control is limited by the restriction on the motor power balance Wm. Change according to the size of that limit. Here, the magnitude of the restriction when the operation of the second electric motor M2 is restricted is, for example, how small the output torque T _M2 that can be output with respect to the target output torque T _{M2 of} the second electric motor _M2 is. This is the difference between the output torques T _M2 of them. Desirably, the motor control means 68 decreases the first motor torque reduction amount DT _M1 as the limit increases in accordance with the limit on the operation of the second motor M2 caused by the constraint on the motor power balance Wm. To do. Here, since the reaction force torque down control is a control that is executed during a shift (upshift) of the automatic transmission unit 20, the motor control means 68 changes the first motor torque reduction amount DT _M1 . It can be said that the determination is made when the shift occurrence determination means 70 affirms that the shift (upshift) of the automatic transmission unit 20 has occurred.

Further, the motor control means 68 changes the first motor torque reduction amount DT _M1 according to the size of the restriction when the operation of the second motor M2 is restricted by the restriction on the motor power balance Wm. Therefore, the first motor torque reduction amount DT _M1 may be changed based on the determination by the power balance constraint determination means 72. For example, the power balance constraint determining means 72 affirms the determination that the operation of the second motor M2 is limited by the constraint on the motor power balance Wm, and the determination that the shift of the automatic transmission unit 20 has occurred is changed. When the generation determination unit 70 affirms, the motor control unit 68 decreases the first motor torque reduction amount DT _M1 in the reaction force torque down control as the restriction on the operation of the second motor M2 increases. In other words, when the shift occurrence determination means 70 affirms the determination, the motor control means 68 compares the reaction force when the power balance constraint determination means 72 affirms the determination as compared with the case where the determination is not. The first motor torque reduction amount DT _M1 in the torque down control is reduced.

  The stepped shift control means 54 is an engagement pressure control means 78 for controlling the engagement pressure of the engagement device (clutch C, brake B) of the automatic transmission unit 20 based on the hydraulic pressure learned value map illustrated in FIG. It has. The engagement pressure control means 78 determines that the operation of the second electric motor M2 is restricted by the restriction on the electric motor power balance Wm, and that the power balance restriction determination means 72 denies that the automatic transmission unit 20 is shifting. The engagement pressure (engagement side engagement pressure) of the engagement device on the engagement side is determined according to the hydraulic pressure learning value map. However, when the power balance constraint determination unit 72 affirms the determination, the engagement pressure that increases the engagement-side engagement pressure during the shift (particularly during the upshift) compared to the case where the determination is not so. Execute adjustment control. Preferably, the engagement pressure adjustment control is executed when the differential unit 11 (power transmission device 10) is in the reverse power running state. Preferably, the engagement side engagement pressure is increased during the upshift inertia phase of the automatic transmission unit 20.

For example, when the operation of the second electric motor M2 is restricted by the restriction on the electric motor power balance Wm, the engagement pressure control means 78 is specifically configured to suppress the shift shock in the engagement pressure adjustment control. Is the engagement-side engagement pressure so that the input rotational speed change rate AN _{18 in} the inertia phase of the automatic transmission unit 20 does not deviate from the predetermined change rate Ani due to the operation restriction of the second electric motor M2. To increase. In other words, the engagement pressure control means 78, when the power balance restriction determination means 72 affirms the determination, the shifting of the automatic transmission unit 20 (particularly, the upshifting) is increased as the operation of the second electric motor M2 is greatly limited. The engagement-side engagement pressure in the engagement pressure adjustment control during shifting is increased. In other words, the more the operation of the second electric motor M2 is greatly limited, the more the operation of the automatic transmission unit 20 depends on the increase in the input torque of the automatic transmission unit 20 due to the decrease in the generated power that is the output power of the second electric motor M2. The engagement side engagement pressure of the engagement pressure adjustment control during the shift is increased. Since the engagement pressure adjustment control is a control executed during the shift of the automatic transmission unit 20, the engagement pressure control means 78 determines that a shift (upshift) of the automatic transmission unit 20 has occurred. It can be said that the engagement pressure adjustment control is executed when the shift occurrence determination means 70 is affirmed.

There are various methods for determining the engagement-side engagement pressure in the engagement pressure adjustment control. For example, the engagement pressure control means 78 is used when the power balance constraint determination means 72 denies the determination. A predetermined engagement pressure correction value is added to the side engagement pressure, that is, the normal engagement side engagement pressure to determine the engagement side engagement pressure in the engagement pressure adjustment control. Its engagement pressure correction value, the operating limits of the second electric motor M2 in the case where the operation of the second electric motor M2 is limited by constraints on the motor power balance Wm counteracts the effect on the input rotation speed variation rate AN ₁₈ The correction value is experimentally set in advance. For example, in the upshift of the automatic transmission unit 20 in the reverse power running state, as shown in FIG. 10, the greater the restriction on the motor power balance Wm, that is, the greater the operation restriction of the second electric motor M2 due to the restriction, The engagement pressure correction value (engagement pressure correction amount) is set to be large. This is because as the operation limit of the second electric motor M2 is larger, the regenerative torque of the second electric motor M2 is greatly reduced with the execution of the reaction force torque down control. When the engagement pressure correction value is set as described above, the engagement pressure control means 78 causes the input of the automatic transmission unit 20 due to a decrease in the second motor torque T _M2 as the operation limit of the second motor _M2 increases. In accordance with the increase in torque, the engagement-side engagement pressure in the engagement pressure adjustment control is determined so as to increase. Note that the broken line indicated as “none” on the horizontal axis in FIG. 10 is a division of the determination result of the power balance constraint determination unit 72, and is on the right side (the side on which the constraint on the motor power balance Wm is larger) than the broken line. In the region, the power balance constraint determination means 72 affirms the determination. If the power balance constraint determination means 72 affirms the determination, such a case is rare, so that the stepped shift control means 54 determines that the learning precondition has not been satisfied, and The combined pressure learning control may not be performed.

When the power balance constraint determination means 72 affirms that the operation of the second motor M2 is limited by the constraint on the motor power balance Wm, the motor control means 68 is As described above, the first motor torque reduction amount DT _M1 in the force torque down control is reduced, and the engagement pressure control means 78 executes the engagement pressure adjustment control. It does not have to be the same as whether or not the operation is limited by the restriction on the electric motor power balance Wm, and the electric motor control means 68 makes the first electric motor torque decrease amount DT _M1 with different control execution conditions. The engagement pressure control means 78 may execute the engagement pressure adjustment control in preference to reducing the value. For example, the control execution condition of whether or not the operation of the second electric motor M2 is limited by the restriction on the electric motor power balance Wm is applied as it is to the engagement pressure adjustment control, and the electric motor control means 68 (the electric motor reaction force torque). In addition to the affirmation of the determination by the power balance constraint determination unit 72, the control unit 68) determines that when the operation of the second electric motor M2 is limited beyond a predetermined limit, compared to the case where it is not. 1 Decrease the motor torque reduction amount DT _M1 . In this case, when the operation of the second electric motor M2 is restricted but the magnitude of the restriction does not exceed the predetermined limit, that is, when the operation restriction of the second electric motor M2 is not so large. While the engagement pressure control means 78 performs the engagement pressure adjustment control, the motor control means 68 does not execute the control to reduce the first motor torque reduction amount DT _M1 , but exceeds a predetermined limit. When the operation of the second electric motor M2 is restricted, that is, when the operation of the second electric motor M2 is greatly restricted, both controls are executed. That is, the engagement pressure adjustment control is executed with priority over the control for reducing the first motor torque reduction amount DT _M1 in relation to the operation restriction of the second motor M2. When the operation of the second electric motor M2 is restricted beyond the predetermined limit set for the operation restriction of the second electric motor M2, the engagement pressure adjustment control is performed in order to suppress the shift shock. It is an experimentally determined determination value that determines that it is necessary to execute the control for reducing the first motor torque reduction amount DT _M1 in conjunction with the engagement pressure adjustment control. . In short, this is a determination value for determining the necessity of executing control for reducing the first motor torque reduction amount DT _M1 in order to suppress the shift shock. Therefore, when the operation of the second electric motor M2 is limited beyond a predetermined limit, even if the engagement pressure control means 78 executes the engagement pressure adjustment control, it is not sufficient for suppressing the shift shock. a case where it is determined that there is no, i.e., if the amount of deviation between the output torque T _M2 can be output as the output torque T _M2 as a target of the second electric motor M2 exceeds a predetermined amount corresponding to the predetermined limit .

  FIG. 11 is a diagram for explaining the main control operation of the electronic control unit 40, that is, the control operation during shifting of the automatic transmission unit 20 when the operation of the second electric motor M2 is limited by the restriction on the electric motor power balance Wm. This flowchart is repeatedly executed with an extremely short cycle time of about several milliseconds to several tens of milliseconds, for example. In order to facilitate understanding, the following description will be given by taking as an example the case where the upshift of the automatic transmission unit 20 is performed in the reverse power running state. However, the application of the present invention is limited to such a case. is not. Preferably, the flowchart of FIG. 11 is executed when the differential unit 11 is in the unlocked state and the vehicle is running on the engine.

  First, in step (hereinafter, “step” is omitted) SA1 corresponding to the shift generation determination means 70, it is determined whether or not a shift of the automatic transmission unit 20 has occurred. Preferably, it is determined whether or not an upshift of the automatic transmission unit 20 has occurred. If the determination of SA1 is affirmative, that is, if a shift (upshift) of the automatic transmission unit 20 occurs, the process proceeds to SA2. On the other hand, if the determination of SA1 is negative, this flowchart ends.

  In SA2 corresponding to the power balance constraint determination means 72, it is determined whether or not the operation of the second electric motor M2 is limited by the constraint on the motor power balance Wm. When the determination of SA2 is affirmed, that is, when the operation of the second electric motor M2 is restricted due to the restriction on the electric motor power balance Wm, the process proceeds to SA5. On the other hand, when the determination of SA2 is negative, the process proceeds to SA3.

In SA3 corresponding to the motor control means 68, the second motor torque T _M2 is changed from the torque before the shift to the vehicle speed V or the torque before the shift within the inertia phase of the shift of the automatic transmission unit 20 so that the shift shock is not generated as much as possible. It smoothly changes to the target torque after the shift determined by the accelerator opening Acc.

In addition SA3, so as to suppress the change in the engine rotational speed N _E in the inertia phase of the shift of the automatic shifting portion 20, to lower the first electric motor torque T _M1 with respect to the pre-shift (shift start before) The reaction force torque down control is executed. The first motor torque reduction amount DT _M1 in the reaction force torque down control is experimentally determined in advance based on, for example, inertia included in the first motor M1 and a rotating component that rotates in conjunction with the first motor M1. Since SA3 is a step executed when the determination of SA2 is denied, in SA3, the input / output power of the first motor M1 and the input / output power of the second motor M2 mutually limit each other. There is no. After SA3, the process proceeds to SA4.

  In SA4 corresponding to the engagement pressure control means 78, the normal engagement is performed without correcting the normal engagement side engagement pressure by adding an engagement pressure correction amount as shown in FIG. The clutch-to-clutch shift of the automatic transmission unit 20 is performed with the engagement side engagement pressure.

In SA5 corresponding to the motor control means 68, the reaction force torque down control is executed within the inertia phase of the shift of the automatic transmission unit 20, and the first motor torque reduction amount DT _{M1 at} that time is SA3. It is made smaller than the first motor torque reduction amount DT _M1 in the executed reaction force torque down control. The amount of reduction is set experimentally using the vehicle speed V, the charge / discharge power allowable range W _{IN / OUT of the} power storage device 60, and the like as parameters. The greater the restriction on the operation of is, the smaller the first motor torque reduction amount DT _M1 is.

  Further, in SA5, in the reverse power running state, the power consumption (input power) of the first motor M1 is reduced by executing the reaction force torque down control, and accordingly, the motor power balance Wm The generated power (output power) of the second electric motor M2 is reduced within a necessary range so as to be within the range. After SA5, the process proceeds to SA6.

In SA5, the first motor torque reduction amount DT _M1 when the reaction torque reduction control is executed within the inertia phase of the shift of the automatic transmission unit 20 is the reaction torque reduction executed in SA3. When the first motor torque decrease amount DT _M1 in the control is made smaller than the first motor torque decrease amount DT _M1, but the operation of the second motor M2 is limited beyond a predetermined limit. You may be made to perform.

  In SA6 corresponding to the engagement pressure control means 78, the engagement side of the automatic transmission unit 20 during the shift according to the increase in the input torque of the automatic transmission unit 20 due to the decrease in the generated power of the second electric motor M2 is described. The engagement pressure adjustment control for increasing the engagement pressure (engagement side engagement pressure) of the engagement device is executed. For example, the engagement-side engagement pressure in the engagement-pressure adjustment control is illustrated with respect to the engagement-side engagement pressure (normal engagement-side engagement pressure) when the determination of SA2 is negative. 10 is determined by correcting the engagement pressure correction amount as shown in FIG. Then, the clutch-to-clutch shift of the automatic transmission unit 20 is performed with the engagement-side engagement pressure corrected as described above.

FIG. 12 shows that when the accelerator pedal 41 is depressed and the differential unit 11 is in the unlocked state and in the reverse power running state, the gear stage of the automatic transmission unit 20 increases from the second speed to the third speed. It is a time chart for demonstrating the control action | operation shown by FIG. 11 taking the case where it shifted as an example. In this time chart, since it is an upshift from the second speed to the third speed, as shown in FIG. 2, the first brake B1 is the engagement side engagement device, and the second brake B2 is It is a disengagement side engagement device. Further, in FIG. 12, the change in the hydraulic pressure value, the first electric motor torque T _M1 , and the second electric motor torque T _M2 is shown by the broken line as well as the solid line, but the solid line indicates the SA2 in FIG. The case where the determination is negative is shown, and the broken line shows the case where the determination of SA2 in FIG. 11 is positive.

Time point t ₁ in FIG. 12, shift the speed change is started the output of the automatic transmission portion 20 to the hydraulic control circuit 42 (shift output command) indicating that were made. That, t ₁ point is the shift start time of the automatic shifting portion 20. Also, t ₂ time is the inertia phase starting point of the shift of the automatic shifting portion 20, t ₄ time is a lever end of the automatic shifting portion 20. Then, t ₃ time from the differential portion 11 (power transmitting device 10) is the reverse power running state, cut to the powering state in which the second electric motor M2 the first electric motor M1 generates power exerts a driving force by consuming power It is the time of change.

Thus, in the time chart of hydraulic pressure value, begins to decrease the hydraulic pressure value P _B2 of the disengagement side from time point t _1, also oil pressure value P _B1 dashed and solid lines and in the process is different although both engagement side t ₁ begins to rise from the time, it has been shown that the clutch-to-clutch shifting action of the automatic transmission portion 20 is performed between the time point t ₁ and t ₄ time. Then, between t ₂ time and t ₄ time is the inertia phase of the shifting action of the automatic transmission portion 20, the input rotational speed N ₁₈ of the automatic shifting portion 20 is lowered at the predetermined rate of change Ani, power distribution because utilizing the differential action of the mechanism 16 suppresses the fluctuation of the engine rotational speed N _E during the shift, the reaction torque down to lower the first electric motor torque T _{M1 (absolute} value) at SA3 or SA5 in FIG. 11 control is performed so that the first electric motor speed N _M1 in reverse is rising as the input rotational speed N _18.

Here, when the determination of SA2 in FIG. 11 is negative, the input / output power of the first motor M1 and the input / output power of the second motor M2 are not mutually limited, that is, the second since operation of the motor M2 is not particularly limited, by the execution of SA3 in FIG. 11, between t ₂ time and t ₄ time (inertia phase), as shown by the solid line in the time chart of the first electric motor torque of FIG. 12 In the reaction torque reduction control, the first motor torque T _M1 is decreased as an absolute value, and the second motor torque T _M2 is the target as shown by the solid line in the time chart of the second motor torque in FIG. It is smoothly changed to the target torque after shifting along the second motor torque change (solid line). Further, by executing SA4 in FIG. 11, the clutch-to-clutch shift of the automatic transmission unit 20 with the normal engagement side engagement pressure as shown by the solid line in the time chart of the hydraulic pressure value P _B1 (engagement side) in FIG. Is progressing.

On the other hand, when the determination of SA2 in FIG. 11 is affirmed, the input / output power of the first motor M1 is set so that the motor power balance Wm of the first motor M1 and the second motor M2 is within the range of the restriction thereto. When since the output power of the second electric motor M2 is adjusted to one another, by the execution of the SA5 in FIG. 11, between t ₂ time and t ₄ time, the SA3 similarly to the reaction torque down control Although executed, the first motor torque reduction amount DT _M1 (absolute value) at that time is as compared to the time of SA3 execution (solid line in FIG. 12) as shown by the broken line in the time chart of the first motor torque in FIG. Have been made smaller. Further, between the t ₂ time and t ₃ time points is the reverse power running state, since the reduction of the first electric motor torque T _M1 is the reduction in the power consumption of the first electric motor M1, the motor power balance Wm is thereto The generated electric power (output electric power) of the second electric motor M2 is reduced so as to be within the constraint range, and the second electric motor torque T _M2 (absolute value) is indicated by a broken line in the second electric motor torque time chart of FIG. ) Is smaller than that when SA3 is executed (solid line in FIG. 12). Thus, although the second motor torque T _M2 (dashed line in FIG. 12) at SA5 in FIG. 11 deviates from that at the time of SA3 execution (solid line in FIG. 12), the first motor torque reduction amount DT _M1 is reduced. As the deviation amount of the second electric motor torque T _M2 is suppressed by the. Then, if the above deviation amount with respect to the solid line of the second motor torque T _M2 in FIG. 12 is suppressed, the operation limitation of the second motor M2 due to the restriction on the motor power balance Wm is correspondingly reduced to the input rotational speed N of the automatic transmission unit 20. _The effect on ₁₈ is reduced.

Moreover, by the execution of the SA5 in FIG. 11, although the deviation amount with respect to the dashed solid lines in the time chart of the second electric motor torque T _M2 of Figure 12 is suppressed, t ₂ time and t ₃ time points and is the inertia phase early since the input torque of the automatic transmission portion 20 by the relative decrease of the second electric motor torque T _{M2 (absolute} value) at between increasing, the rate of change input speed N ₁₈ of the automatic shifting portion 20 is lowered is small There is a risk. Therefore, by executing SA6 in FIG. 11, as indicated by a broken line in the time chart of the hydraulic pressure value P _B1 (engagement side) in FIG. 12, substantially synchronizes with the relative decrease in the second motor torque T _M2 (absolute value). In the initial phase of the inertia phase, the hydraulic pressure value P _B1 on the engagement side is increased with respect to the time of SA4 execution (solid line in FIG. 12). As a result, increasing the engagement-side engagement pressure (hydraulic pressure value P _B1 ) acts to increase the rate of change of the input rotation speed N ₁₈ , so that the relative value of the second motor torque T _M2 (absolute value) The influence on the input rotation speed N ₁₈ of the general decrease and the relative increase of the engagement-side engagement pressure cancel each other, and the input rotation speed N ₁₈ is controlled to change at the predetermined change rate Ani. ing.

This embodiment has the following effects (A1) to (A5). (A1) According to the present embodiment, the motor control means 68 (the motor reaction force torque control means 68) reduces the first motor torque (reaction torque) T _M1 reduction amount DT _M1 with respect to the automatic transmission 20 before shifting. That is, since the first motor torque reduction amount DT _M1 in the reaction torque reduction control is changed according to the magnitude of the restriction when the operation of the second motor M2 is restricted by the restriction on the motor power balance Wm. The operation shock of the second electric motor M2 due to the restriction on the electric motor power balance Wm can be relaxed, and the shift shock can be reduced.

(A2) According to the present embodiment, the engagement pressure control unit 78 determines that the operation of the second electric motor M2 is restricted by the restriction on the electric motor electric power balance Wm when the electric power balance restriction determination unit 72 affirms the determination. The greater the operation of the second electric motor M2, the more the operation of the automatic transmission unit 20 depends on the increase in the input torque of the automatic transmission unit 20 due to the decrease in the generated power that is the output power of the second electric motor M2. The engagement side engagement pressure of the engagement pressure adjustment control during the shift is increased. Accordingly, an appropriate engagement-side engagement pressure corresponding to an increase in input torque of the automatic transmission unit 20 due to the operation restriction of the second electric motor M2 is obtained, and thereby the input of the automatic transmission unit 20 is reduced so as to reduce the shift shock. it is possible to change the rotational speed N _18. That is, increasing the engagement-side engagement pressure during the shift of the automatic transmission unit 20 acts in a direction to cancel the influence of the increase in the input torque on the change rate AN ₁₈ of the input rotation speed N ₁₈ .

(A3) According to the present embodiment, when the shift occurrence determination means 70 affirms the determination, the motor control means 68 indicates that the operation of the second motor M2 is limited by the restriction on the motor power balance Wm. When the power balance constraint determination means 72 affirms the determination, the first motor torque decrease amount DT _M1 in the reaction force torque down control is made smaller than in the case where the determination is not so. The operation limit of the second electric motor M2 due to the restriction on the electric motor power balance Wm is relaxed by reducing _M1 , and as a result, the restriction is given to the input rotational speed change rate AN ₁₈ during the shift of the automatic transmission unit 20. The impact can be reduced.

(A4) According to the present embodiment, the motor control means 68 sets the first motor M1 and the second motor M2 so that the charge / discharge power of the power storage device 60 falls within the charge / discharge power allowable range W _{IN / OUT} . Since the operation is performed, it is possible to maintain the durability of the power storage device 60 and the electrical components related thereto.

(A5) According to the present embodiment, the motor control means 68 includes the first motor M1 and the second motor M2 so that the temperatures of the first motor M1 and the second motor M2 are equal to or lower than the motor allowable temperature L _TM, respectively. Therefore, it is possible to maintain the durability of the first electric motor M1, the second electric motor M2, and parts related thereto.

  Next, another embodiment of the present invention will be described. In the following description, parts common to the embodiments are denoted by the same reference numerals and description thereof is omitted.

  A functional block diagram of this embodiment is shown in FIG. 6, which is common to the first embodiment. In FIG. 6, the present embodiment is the same as the first embodiment except for the stepped speed change control means 54, but the stepped speed change control means 54 is replaced with the stepped speed change control means 102. Different. The stepped shift control means 102 has the following functions in addition to the function of the stepped shift control means 54.

The stepped shift control means (shift control means) 102 of this embodiment is the same as the stepped shift control means 54 of the first embodiment, and the input rotation of the automatic transmission unit 20 during the inertia phase of the shift of the automatic transmission unit 20. as the speed N ₁₈ is changed at the predetermined rate of change Ani, the frictional engagement device of the automatic transmission portion 20 (the brake B, the clutch C) carrying out the learning control for changing the learning engagement pressure. However, unlike the stepped shift control means 54, if the power balance constraint determination means 72 affirms that the operation of the second motor M2 is limited by the constraint on the motor power balance Wm, The shift control means 102 performs the engagement pressure learning control as distinguished from the case where the shift is not so, that is, the case where the power balance constraint determination means 72 denies the determination. For example, a hydraulic pressure learning value map (see FIG. 9) when the power balance constraint determination unit 72 denies the determination is set to A pattern, and a hydraulic pressure learning value map when the power balance constraint determination unit 72 affirms the determination is B. Each step is provided separately as a pattern, and the stepped shift control unit 102 executes the learning control and selectively updates the A pattern or the B pattern according to the determination result of the power balance constraint determination unit 72.

Further, instead of providing a plurality of hydraulic pressure learning value maps such as A pattern and B pattern, for example, the stepped shift control means 102 is configured such that the operation of the second electric motor M2 is limited by the restriction on the electric motor power balance Wm. If the power balance constraint determination means 72 affirms this determination, the engagement pressure learning control may not be performed. Assuming that the stepped shift control unit 102 does not perform the learning control when the power balance constraint determining unit 72 affirms the determination, the engagement pressure control unit included in the stepped shift control unit 102 is assumed. 78 for determining the engagement pressure when the power balance constraint determination means 72 affirms the determination, that is, for determining the engagement side engagement pressure in the engagement pressure adjustment control. The learning value obtained as a result of the learning control of the engagement pressure performed when the balance constraint determination means 72 denies the determination is used. For example, the engagement pressure control unit 78 uses a learning value obtained as a result of the engagement pressure learning control performed when the power balance constraint determination unit 72 denies the determination, and uses the learning value as the learning value. An engagement pressure correction value (see the first embodiment) is added to determine the engagement side engagement pressure in the engagement pressure adjustment control. In the upshift of the automatic transmission 20 in the reverse power running state, for example, as shown in FIG. 10 of the first embodiment, the greater the restriction on the motor power balance Wm, that is, the second electric motor M2 due to the restriction. The engagement pressure correction value (engagement pressure correction amount) is set so as to increase as the operation limit increases. When the engagement pressure correction value (engagement pressure correction amount) is set as shown in FIG. 10, the engagement pressure control means 78 increases the second motor torque as the operation limit of the second motor M2 increases. depending on the increase in the input torque of the automatic transmission portion 20 due to a decrease in T _M2, as the engagement side engagement pressure in the engagement pressure adjustment control is high and thus to determine it.

  FIG. 13 is a flowchart of the second embodiment corresponding to FIG. 11 of the first embodiment, in which the main part of the control operation of the electronic control unit 40, that is, the automatic transmission unit according to restrictions on the motor power balance Wm. 20 is a flowchart illustrating a control operation for switching execution of learning control of 20 engagement pressures, and is repeatedly executed with a very short cycle time of, for example, about several milliseconds to several tens of milliseconds. As in the description of FIG. 11, for ease of understanding, the following description will be given by taking as an example a case where the automatic transmission unit 20 is upshifted in the reverse power running state. The application of the present invention is not limited. Preferably, the flowchart of FIG. 13 is executed when the differential unit 11 is in the unlocked state and the vehicle is running on the engine. Further, SB1 and SB2 in FIG. 13 are the same steps as SA1 and SA2 in FIG. 11 of the first embodiment, respectively. Hereinafter, differences from FIG. 11 in FIG. 13 will be mainly described.

  When the determination of SB2 in FIG. 13 is negative, the process proceeds to SB3. In SB3 corresponding to the stepped shift control means 102, the learning is performed by changing the engagement pressure of the friction engagement device (brake B, clutch C) of the automatic transmission unit 20 by learning on the condition that the learning precondition is satisfied. Control is performed, and the oil pressure learning value map as shown in FIG. 9 is updated. After SB3, the process proceeds to SB4.

  In SB4 corresponding to the engagement pressure control means 78, when the determination of SB2 is negative, the learning value (see FIG. 9) obtained as a result of the engagement pressure learning control performed in SB3 is used as it is. 10 is used without correction for adding the engagement pressure correction amount as shown in FIG. 10, and the clutch-to-clutch shift of the automatic transmission unit 20 is performed with the normal engagement-side engagement pressure.

  When the determination of SB2 is affirmed, the process proceeds to SB5. In SB5 corresponding to the stepped shift control means 102, the learning control of the engagement pressure is prohibited, and the learning control is not performed. Alternatively, as another control operation, for example, the hydraulic pressure learning value map (see FIG. 9) when the determination of SB2 is negative is set as the A pattern, and the hydraulic pressure learning value map when the determination of SB2 is positive is the B pattern. A plurality of oil pressure learning value maps are provided, and in SB3 executed when the determination of SB2 is denied, the learning control is performed and the oil pressure learning value map of the A pattern is updated. In SB5 executed when the determination is affirmative, the learning control may be performed and the hydraulic pressure learning value map of the B pattern may be updated. After SB5, the process proceeds to SB6.

  In SB6 corresponding to the engagement pressure control means 78, as in SA6 of FIG. 11, the shift of the automatic transmission unit 20 is changed according to the increase in the input torque of the automatic transmission unit 20 due to the decrease in the generated power of the second electric motor M2. The engagement pressure adjustment control for increasing the engagement pressure (engagement side engagement pressure) of the engagement device on the engagement side is executed. At this time, in SB6 of this flowchart, for example, the engagement side engagement pressure in the engagement pressure adjustment control is the result of the engagement pressure learning control performed in SB3 when the determination in SB2 is negative. It is determined by correcting the obtained learning value (see FIG. 9) by adding an engagement pressure correction amount as shown in FIG. Then, the clutch-to-clutch shift of the automatic transmission unit 20 is performed with the engagement-side engagement pressure corrected as described above. If the learning control is not performed in SB5, the engagement-side engagement pressure is calculated by the correction in SB6 as described above. However, the learning control is performed separately according to the determination result of SB2. In this case, the engagement side engagement pressure in the engagement pressure adjustment control of SB6 is determined using the hydraulic pressure learning value map of the B pattern.

  This embodiment is the same as the first embodiment except for the stepped shift control means 54 in FIG. 6, and the stepped shift control means 102 has a function added to the stepped shift control means 54. In addition to the effects (A1) to (A5) of the first embodiment, there are the following effects. (B1) According to the present embodiment, when the power balance constraint determining means 72 affirms that the operation of the second motor M2 is limited by the constraint on the motor power balance Wm, the stepped shift control means 102, because the engagement pressure learning control is not performed, or the engagement pressure learning control is not performed separately from the case where the power balance constraint determination means 72 denies the determination. By implementing the learning control, it is possible to avoid an increase in shift shock and to implement appropriate learning control.

  (B2) According to the present embodiment, as in the first embodiment, when the power balance constraint determination means 72 affirms the determination that the operation of the second motor M2 is limited by the constraint on the motor power balance Wm. The engagement pressure control means 78 executes the engagement pressure adjustment control. In this embodiment, the stepped shift control means 102 may not perform the engagement pressure learning control when the power balance constraint determination means 72 affirms the determination. The combined pressure control unit 78 uses a learning value obtained as a result of the learning control of the engagement pressure performed when the power balance constraint determination unit 72 denies the determination, and the engagement pressure is used as the learning value. A correction value is added to determine the engagement side engagement pressure in the engagement pressure adjustment control. In this way, even if the operation of the second electric motor M2 is rarely restricted by the restriction on the electric motor power balance Wm, the engagement-side engagement pressure is set based on the sufficiently learned value. Can be determined, thereby reducing shift shock. As shown in FIG. 6, since the engagement pressure control means 78 is included in the stepped shift control means (shift control means) 102, the control function of the engagement pressure control means 78 is the control function of the stepped shift control means 102. It can be said that.

  FIG. 14 is a skeleton diagram illustrating the configuration of a vehicle power transmission device 110 (hereinafter referred to as “power transmission device 110”) according to another embodiment of the present invention, and FIG. 15 is a shift stage of the power transmission device 110. FIG. 16 is a collinear diagram illustrating a speed change operation of the power transmission device 110. FIG.

  The power transmission device 110 includes the differential unit 11 including the first electric motor M1, the power distribution mechanism 16, and the second electric motor M2, and the differential unit 11 and the output shaft 22 in the same manner as in the above-described embodiment. And a forward three-stage automatic transmission unit 112 connected in series via a transmission member 18. The power distribution mechanism 16 includes, for example, a single pinion type differential planetary gear unit 24 having a predetermined gear ratio ρ0 of about “0.418”, a switching clutch C0, and a switching brake B0. The automatic transmission unit 112 includes a single pinion type first planetary gear device 26 having a predetermined gear ratio ρ1 of about “0.532”, for example, and a single pinion having a predetermined gear ratio ρ2 of about “0.418”, for example. And a second planetary gear device 28 of the type. The first sun gear S1 of the first planetary gear device 26 and the second sun gear S2 of the second planetary gear device 28 are integrally connected and selectively connected to the transmission member 18 via the second clutch C2. The first carrier CA1 of the first planetary gear device 26 and the second ring gear R2 of the second planetary gear device 28 are integrally connected to the output shaft 22 by being selectively connected to the case 12 via one brake B1. The first ring gear R1 is selectively connected to the transmission member 18 via the first clutch C1, and the second carrier CA2 is selectively connected to the case 12 via the second brake B2.

In the power transmission device 110 configured as described above, for example, as shown in the engagement operation table of FIG. 15, the switching clutch C0, the first clutch C1, the second clutch C2, the switching brake B0, the first brake By selectively engaging the B1 and the second brake B2, either the first gear (first gear) to the fourth gear (fourth gear) or the reverse gear ( Reverse gear) or neutral is selectively established, so that a gear ratio γ (= input shaft rotational speed N _IN / output shaft rotational speed N _OUT ) that changes approximately in a ratio is obtained for each gear stage. It has become. In particular, in this embodiment, the power distribution mechanism 16 is provided with a switching clutch C0 and a switching brake B0, and the differential unit 11 is configured as described above when either the switching clutch C0 or the switching brake B0 is engaged. In addition to the continuously variable transmission state that operates as a continuously variable transmission, it is possible to configure a constant transmission state that operates as a transmission having a constant gear ratio. Therefore, in the power transmission device 110, the differential unit 11 and the automatic transmission unit 112 that are brought into a constant transmission state by engaging and operating either the switching clutch C0 or the switching brake B0 operate as a stepped transmission. A stepped speed change state is configured, and the differential part 11 and the automatic speed changer 112, which are set to a continuously variable speed state by operating neither the switching clutch C0 nor the switching brake B0, operate as an electric continuously variable transmission. A continuously variable transmission state is configured. In other words, the power transmission device 110 is switched to the stepped shift state by engaging any one of the switching clutch C0 and the switching brake B0, and does not engage any switching clutch C0 or the switching brake B0. It is switched to the continuously variable transmission state.

  For example, when the power transmission device 110 functions as a stepped transmission, as shown in FIG. 15, the gear ratio γ1 is set to a maximum value, for example, due to the engagement of the switching clutch C0, the first clutch C1, and the second brake B2. A first speed gear stage that is approximately “2.804” is established, and the gear ratio γ2 is smaller than the first speed gear stage by engagement of the switching clutch C0, the first clutch C1, and the first brake B1, for example. The second speed gear stage which is about “1.531” is established, and the gear ratio γ3 is smaller than the second speed gear stage by engagement of the switching clutch C0, the first clutch C1 and the second clutch C2, for example. The third speed gear stage which is about “1.000” is established, and the gear ratio γ4 is smaller than the third speed gear stage due to the engagement of the first clutch C1, the second clutch C2 and the switching brake B0. For example fourth gear is approximately "0.705", is established. Further, by the engagement of the second clutch C2 and the second brake B2, a reverse gear stage in which the speed ratio γR is a value between the first speed gear stage and the second speed gear stage, for example, about “2.393” is established. Be made. When the neutral “N” state is set, for example, all clutches and brakes C0, C1, C2, B0, B1, and B2 are released.

However, when power transmission device 110 functions as a continuously variable transmission, both switching clutch C0 and switching brake B0 in the engagement table shown in FIG. 15 are released. Thus, the differential unit 11 functions as a continuously variable transmission, and the automatic transmission unit 112 in series functions as a stepped transmission, whereby the first speed, the second speed, and the third speed of the automatic transmission unit 112 are achieved. For each gear, the input rotational speed N ₁₈ of the automatic transmission 112, that is, the transmission member rotational speed N ₁₈ is changed steplessly, and a stepless speed ratio width is obtained for each gear step. Therefore, the gear ratio between the gear stages can be continuously changed continuously and the total gear ratio γT of the power transmission device 110 as a whole can be obtained continuously.

  FIG. 16 shows a power transmission device 110 including a differential unit 11 that functions as a continuously variable transmission unit or a first transmission unit, and an automatic transmission unit 112 that functions as a transmission unit (stepped transmission unit) or a second transmission unit. FIG. 2 shows a collinear diagram that can represent on a straight line the relative relationship between the rotational speeds of the rotating elements that are connected in different gear stages. When the switching clutch C0 and the switching brake B0 are released and when the switching clutch C0 or the switching brake B0 is engaged, the rotational speeds of the elements of the power distribution mechanism 16 are the same as those described above.

  The four vertical lines Y4, Y5, Y6, Y7 of the automatic transmission unit 112 in FIG. 16 correspond to the fourth rotating element (fourth element) RE4 and are connected to each other in order from the left. The second sun gear S2, the second carrier CA2 corresponding to the fifth rotating element (fifth element) RE5, the first carrier CA1 corresponding to the sixth rotating element (sixth element) RE6 and coupled to each other A two-ring gear R2 represents a first ring gear R1 corresponding to a seventh rotating element (seventh element) RE7. Further, in the automatic transmission unit 112, the fourth rotation element RE4 is selectively connected to the transmission member 18 via the second clutch C2, and is also selectively connected to the case 12 via the first brake B1, for the fifth rotation. The element RE5 is selectively connected to the case 12 via the second brake B2, the sixth rotating element RE6 is connected to the output shaft 22 of the automatic transmission unit 112, and the seventh rotating element RE7 is connected via the first clutch C1. It is selectively connected to the transmission member 18.

In the automatic transmission unit 112, as shown in FIG. 16, when the first clutch C1 and the second brake B2 are engaged, the vertical line Y7 and the horizontal line X2 indicating the rotational speed of the seventh rotation element RE7 (R1). And an oblique straight line L1 passing through the intersection of the vertical line Y5 and the horizontal line X1 indicating the rotational speed of the fifth rotation element RE5 (CA2), and a sixth rotation element RE6 (CA1, CA1) connected to the output shaft 22. The rotational speed of the output shaft 22 of the first speed is shown at the intersection with the vertical line Y6 indicating the rotational speed of R2). Similarly, at an intersection of an oblique straight line L2 determined by engaging the first clutch C1 and the first brake B1, and a vertical line Y6 indicating the rotational speed of the sixth rotating element RE6 connected to the output shaft 22. The rotation speed of the output shaft 22 at the second speed is shown, and the horizontal straight line L3 determined by engaging the first clutch C1 and the second clutch C2 and the sixth rotation element RE6 connected to the output shaft 22 The rotation speed of the third-speed output shaft 22 is shown at the intersection with the vertical line Y6 indicating the rotation speed. In the first speed to third speed, as a result of the switching clutch C0 is engaged, power from the differential portion 11 to the seventh rotary element RE7 at the same speed as the engine speed N _E is input. However, when the switching brake B0 in place of the switching clutch C0 is engaged, the drive force received from the differential portion 11 is input at a higher speed than the engine rotational speed N _E, first clutch C1, second The output shaft of the fourth speed at the intersection of the horizontal straight line L4 determined by engaging the clutch C2 and the switching brake B0 and the vertical line Y6 indicating the rotational speed of the sixth rotating element RE6 connected to the output shaft 22 A rotational speed of 22 is indicated.

  The power transmission device 110 of the present embodiment also includes a differential unit 11 that functions as an electric differential unit or a first transmission unit, and an automatic transmission unit 112 that functions as a stepped transmission unit or a second transmission unit. Since the control function as described above with reference to FIG. 6 is applied, the same effect as in the first and second embodiments can be obtained.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this is an embodiment to the last, and this invention is implemented in the aspect which added various change and improvement based on the knowledge of those skilled in the art. Can do.

  For example, in the above-described embodiment, it is assumed that the subject to be changed by the execution of the learning control of the stepped shift control means 54, 102 is the engagement pressure of the friction engagement device provided in the automatic transmission units 20, 112. Although the control has been described, it may be the change rate of the engagement pressure or the engagement time. In short, the object to be changed by the execution of the learning control may be a shift control value for a shift operation exemplified by the engagement pressure of the friction engagement device during the shift of the automatic transmission units 20 and 112. .

Further, in the above-described embodiment, the motor control means 68 determines the first motor torque decrease amount DT _M1 in the reaction force torque down control when the operation of the second motor M2 is restricted by the restriction on the motor power balance Wm. The first motor torque reduction amount DT _M1 may be continuously changed according to the magnitude of the operation limit of the second electric motor M2. It may be changed step by step in one step or two or more steps.

In the above-described embodiment, the motor control means 68 (motor reaction force torque control means 68) uses the first motor torque decrease amount DT _M1 in the reaction force torque down control, and the operation of the second motor M2 determines the motor power. The change is made according to the magnitude of the restriction when restricted by the constraint on the balance Wm. This change is made when the first electric motor M1 functions as a motor that consumes power, that is, the differential section 11. It may be performed when the (power transmission device 10) is in the reverse power running state.

Further, in FIG. 12 of the above-described embodiment, as shown by the broken line in the time chart of the hydraulic pressure value P _B1 (engagement side), the execution of the engagement pressure adjustment control in SA6 of the flowchart of FIG. 2 The hydraulic pressure value P _B1 on the engagement side is increased at the initial stage of the inertia phase in synchronization with the relative decrease in the motor torque T _M2 (absolute value) when SA4 is executed (solid line in FIG. 12). This is not an essential control.

  In the above-described embodiment, the flowchart of FIG. 11 is described as the main part of the control operation of the first embodiment, and the flowchart of FIG. 13 is described as the main part of the control operation of the second embodiment. 11 and FIG. 13 may be combined and expressed as one flowchart. If the flowchart is expressed by combining FIG. 11 and FIG. 13 in this way, for example, FIG. 17 is obtained.

In a normal automatic transmission, the shift transition control is performed by adjusting the engagement pressure of the engagement device (clutch C, brake B) on the engagement side of the automatic transmission, that is, the engagement side engagement pressure. However, in the above-described embodiment, the first electric motor M1 and the second electric motor M2 are connected to the power transmission path from the engine 8 to the input side of the automatic transmission unit 20 so that the power can be transmitted. In the transient control, for example, controlling the input rotational speed change rate AN ₁₈ of the automatic transmission unit 20 to be the target predetermined change rate Ani in the inertia phase of the shift of the automatic transmission unit 20 is the engagement side. There are a case where it is performed by adjusting the engagement pressure, a case where it is performed by controlling one or both of the first electric motor M1 and the second electric motor M2, and a case where both are performed in combination. In the above-described embodiment, when both are performed in combination, the shift transient control by adjusting the engagement side engagement pressure and the shift by one or both of the first motor M1 and the second motor M2 are performed. Which of the transient control is prioritized and executed may be determined based on, for example, restrictions on the motor power balance Wm, the temperatures of the first motor M1 and the second motor M2, and the like.

  Further, in the above-described embodiment, by controlling the operating state of the first electric motor M1, the differential unit 11 (power distribution mechanism 16) continuously changes its speed ratio γ0 from the minimum value γ0min to the maximum value γ0max. Although it functions as an electric continuously variable transmission that can be changed, for example, the gear ratio γ0 of the differential section 11 is changed in a stepwise manner using a differential action instead of continuously. Also good.

  In the power transmission device 10 of the above-described embodiment, the engine 8 and the differential unit 11 are directly connected, but the engine 8 is connected to the differential unit 11 via an engagement device (engagement element) such as a clutch. May be.

  In the power transmission devices 10 and 110 of the above-described embodiments, the first electric motor M1 and the second rotating element RE2 are directly connected, and the second electric motor M2 and the third rotating element RE3 are directly connected. One electric motor M1 is connected to the second rotating element RE2 via an engaging device (engaging element) such as a clutch, and the second electric motor M2 is connected to the third rotating element RE3 via an engaging device such as a clutch. May be.

  In the above-described embodiment, the automatic transmission units 20 and 112 are connected next to the differential unit 11 in the power transmission path from the engine 8 to the drive wheels 38. The order in which the moving part 11 is connected may be sufficient. In short, the automatic transmission units 20 and 112 may be provided so as to constitute a part of the power transmission path from the engine 8 to the drive wheels 38.

  Further, according to FIGS. 1 and 14 of the above-described embodiment, the differential unit 11 and the automatic transmission units 20 and 112 are connected in series, but the power transmission devices 10 and 110 as a whole are electrically differential. If the electric differential function capable of changing the state and the function of shifting according to the principle different from the shift by the electric differential function are provided, the differential unit 11 and the automatic transmission units 20, 112 are mechanically connected. The present invention is applicable even if it is not independent.

  In the above-described embodiment, the power distribution mechanism 16 is a single planetary, but may be a double planetary.

  In the above-described embodiment, the engine 8 is connected to the first rotating element RE1 constituting the differential planetary gear unit 24 so that power can be transmitted, and the first motor M1 can transmit power to the second rotating element RE2. The third rotation element RE3 is connected to the power transmission path to the drive wheel 38. For example, two planetary gear devices are connected to each other by a part of the rotation elements constituting the planetary gear device. , The engine, the electric motor, and the driving wheel are connected to the rotating element of the planetary gear device so that power can be transmitted, and the stepped speed change and the continuously variable are controlled by the clutch or brake connected to the rotating element of the planetary gear device. The present invention is also applied to a configuration that can be switched to a shift.

  In the above-described embodiment, the automatic transmission units 20 and 112 are transmission units that function as stepped automatic transmissions, but may be continuously variable CVTs.

  Further, the hydraulic friction engagement devices such as the clutch C and the brake B in the above-described embodiment are constituted by magnetic powder type, electromagnetic type, mechanical type engagement devices such as a powder (magnetic powder) clutch, an electromagnetic clutch, and a meshing type dog clutch. May be.

  In the above-described embodiment, the second electric motor M2 is directly connected to the transmission member 18. However, the connection position of the second electric motor M2 is not limited to this, and the interval between the engine 8 or the transmission member 18 and the drive wheels 38 is not limited thereto. May be directly or indirectly connected to the power transmission path via a transmission, a planetary gear device, an engagement device, or the like.

  In the power distribution mechanism 16 of the above-described embodiment, the differential carrier CA0 is connected to the engine 8, the differential sun gear S0 is connected to the first electric motor M1, and the differential ring gear R0 is connected to the transmission member 18. However, the connection relationship is not necessarily limited thereto, and the engine 8, the first electric motor M1, and the transmission member 18 are the three elements CA0, S0, and R0 of the differential planetary gear unit 24. It can be connected to either of these.

  In the above-described embodiment, the engine 8 is directly connected to the input shaft 14. However, the engine 8 only needs to be operatively connected, for example, via a gear, a belt, or the like, and does not need to be disposed on a common axis. .

  Further, the first motor M1 and the second motor M2 of the above-described embodiment are disposed concentrically with the input shaft 14, the first motor M1 is connected to the differential sun gear S0, and the second motor M2 is connected to the transmission member 18. However, the first motor M1 is operatively connected to the differential sun gear S0 and the second motor M2 is transmitted through, for example, a gear, a belt, and a speed reducer. It may be connected to the member 18.

  In the above-described embodiment, the automatic transmission units 20 and 112 are connected in series with the differential unit 11 via the transmission member 18, but a counter shaft is provided in parallel with the input shaft 14 and is on the counter shaft. The automatic transmission units 20 and 112 may be arranged concentrically. In this case, the differential unit 11 and the automatic transmission units 20 and 112 are coupled so as to be able to transmit power, for example, as a transmission member 18 through a pair of transmission members including a counter gear pair, a sprocket and a chain. The

  Further, the power distribution mechanism 16 of the above-described embodiment is composed of a pair of differential planetary gear devices 24, but is composed of two or more planetary gear devices in a non-differential state (constant shift state). It may function as a transmission having three or more stages.

  Further, the second electric motor M2 of the above-described embodiment is connected to the transmission member 18 that constitutes a part of the power transmission path from the engine 8 to the drive wheel 38, but the second electric motor M2 is connected to the power transmission path. In addition, the power distribution mechanism 16 can be connected to the power distribution mechanism 16 via an engagement device (engagement element) such as a clutch. The power distribution mechanism 16 is replaced by the second electric motor M2 instead of the first electric motor M1. The configuration of the power transmission devices 10 and 110 that can control the differential state of the motor may be used.

  In the above-described embodiment, the power distribution mechanism 16 includes the switching clutch C0 and the switching brake B0. However, the switching clutch C0 and the switching brake B0 are included in the power transmission device 10 separately from the power distribution mechanism 16. Also good. A configuration in which either one or both of the switching clutch C0 and the switching brake B0 is not conceivable is also conceivable.

  In the above-described embodiment, the differential unit 11 includes the first electric motor M1 and the second electric motor M2. However, the first electric motor M1 and the second electric motor M2 are different from the differential unit 11 in the power transmission device 10. May be provided.

  Further, each of the plurality of embodiments described above can be implemented in combination with each other, for example, by setting priorities.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

1 is a skeleton diagram illustrating a configuration of a vehicle power transmission device to which a control device of the present invention is applied. 2 is an operation chart for explaining a relationship between a speed change operation and an operation of a hydraulic friction engagement device used therefor when the vehicle power transmission device of FIG. FIG. 3 is a collinear diagram illustrating the relative rotational speeds of the respective gear stages when the vehicle power transmission device of FIG. It is a figure explaining the input-output signal of the electronic controller provided in the power transmission device for vehicles of FIG. It is an example of the shift operation apparatus operated in order to select multiple types of shift positions provided with the shift lever. It is a functional block diagram explaining the principal part of the control function by the electronic controller of FIG. In the vehicle power transmission device of FIG. 1, an example of a pre-stored shift diagram that is based on the same two-dimensional coordinates having the vehicle speed and the output torque as parameters and is a basis for shift determination of the automatic transmission unit, An example of a pre-stored switching diagram as a basis for determining whether to change the transmission state of the transmission device, and a pre-stored boundary line between the engine travel region and the motor travel region for switching between engine travel and motor travel It is a figure which shows an example of a driving force source switching diagram, Comprising: It is also a figure which shows each relationship. It is a figure showing the optimal fuel consumption rate curve of the engine of FIG. It is an example of the hydraulic pressure learning value map used in order to explain learning of the engagement pressure (shift control value) by the stepped shift control means of FIG. 6, and is distinguished by upshift and downshift, (a) Is for upshifting, and (b) is for downshifting. When the engagement-side engagement pressure in the engagement pressure adjustment control executed by the engagement pressure control means in FIG. 6 is determined by adding an engagement pressure correction value to the normal engagement pressure, the engagement It is the figure which showed an example of the relationship between a combined pressure correction value (engagement pressure correction amount) and the restriction | limiting with respect to a motor electric power balance. FIG. 5 is a flowchart for explaining a main control operation of the electronic control device of FIG. 4, that is, a control operation for controlling the first motor and the second motor during a shift of the automatic transmission unit. FIG. FIG. 12 is a time chart for explaining the control operation shown in FIG. 11, when the accelerator pedal is depressed, the differential unit is in the unlocked state and the reverse power running state, and the gear stage in the automatic transmission unit. Is a time chart illustrating an example in which the upshift is performed from the second speed to the third speed. FIG. 12 is a flowchart of the second embodiment corresponding to FIG. 11 of the first embodiment, in which the main control operation of the electronic control device of FIG. 4, that is, the engagement pressure of the automatic transmission unit according to the restriction on the motor power balance; It is a flowchart explaining the control action which switches implementation of learning control of this. FIG. 5 is a skeleton diagram illustrating another configuration example of a vehicle power transmission device to which the present invention is preferably applied, and is a skeleton diagram of a third embodiment corresponding to FIG. 1. FIG. 15 is an operation chart for explaining the relationship between the gear position in the stepped speed change state of the vehicle power transmission device of FIG. 14 and the operation combination of the hydraulic friction engagement device for achieving the same, corresponding to FIG. 2. It is an action | operation chart of 3rd Example. FIG. 15 is a collinear diagram for explaining the relative rotational speeds of the respective gear stages when the vehicle power transmission device of FIG. 14 is operated in a stepped speed change operation, and is a collinear diagram of the third embodiment corresponding to FIG. 3. . 14 is a flowchart when the control operation shown in the flowchart of FIG. 11 and the control operation shown in the flowchart of FIG. 13 are combined and expressed as one flowchart.

Explanation of symbols

8: Engine 10, 110: Power transmission device (vehicle power transmission device)
11: Differential part (electrical differential part)
16: Power distribution mechanism (differential mechanism)
20, 112: Automatic transmission (stepped transmission)
38: Drive wheel 40: Electronic control device (control device)
54, 102: Stepped shift control means (shift control means)
60: Power storage device 68: Electric motor control means (electric motor reaction force torque control means)
78: Engagement pressure control means M1: First electric motor M2: Second electric motor C1: First clutch (engagement device)
C2: Second clutch (engagement device)
C3: Third clutch (engagement device)
B1: First brake (engagement device)
B2: Second brake (engagement device)
B3: Third brake (engagement device)

Claims (6)

A differential mechanism coupled between the engine and the drive wheel; and a first electric motor coupled to the differential mechanism so as to be able to transmit power, and the operation state of the first electric motor is controlled to control the differential. An electric differential unit that controls a differential state of the mechanism, a second electric motor that is coupled to the drive wheel so as to be able to transmit power, and a stepped transmission that forms part of the power transmission path. A control device for a vehicle power transmission device,
The stepped transmission unit is a stepped transmission that selectively establishes a plurality of shift stages according to engagement and release of a plurality of engagement devices, and switching of the shift stages of the stepped transmission unit engages them. Done by re-holding the device,
Electric motor reaction force torque control means for reducing the reaction force torque of the first electric motor with respect to that before the gear shift during gear shifting of the stepped transmission unit is provided;
The motor reaction force torque control means is configured to change the operation of the second motor before the shift according to the magnitude of the limitation when the operation of the second motor is limited by the constraint on the balance of input / output power of the first motor and the second motor. The amount of decrease in the reaction torque with respect to
When the operation of the second motor is limited by the restriction on the input / output power balance of the first motor and the second motor, the input torque of the stepped transmission unit caused by the decrease in the generated power of the second motor Increasing the engagement pressure of the engagement device on the engagement side during the speed change according to the increase in the speed is given priority over the change in the amount of decrease in the reaction force torque by the motor reaction force torque control means. And a control device for a vehicle power transmission device, characterized in that the control device includes an engagement pressure control means to be executed . When the operation of the second motor is limited by constraints on the input / output power balance of the first motor and the second motor, the motor reaction force torque control means is configured to compare the first motor and the first motor as compared with the case where the operation is not performed. 2. The control device for a vehicle power transmission device according to claim 1, wherein a reduction amount of a reaction torque of the electric motor is reduced. When the operation of the second electric motor is limited by the restriction on the input / output power balance of the first electric motor and the second electric motor, the learning control of the engagement pressure of the stepped transmission is distinguished from the case where it is not. The control device for a vehicle power transmission device according to claim 1 or 2 , further comprising a shift control means that implements or does not implement the learning control. When the operation of the second electric motor is limited by the constraint on the input / output power balance of the first electric motor and the second electric motor, the shift control means obtains the result of the learning control performed otherwise. The control device for a vehicle power transmission device according to claim 3 , wherein the learned value is used to determine an engagement pressure of the stepped transmission unit. A power storage device for charging and discharging the first motor and the second motor is provided;
The first electric motor and the second electric motor, according to claim 1 to 4, characterized in that charge-discharge electric power of said power storage device is actuated so as to fall within a predetermined allowable range with respect to this charge-discharge electric power The control apparatus of the power transmission device for vehicles of any one of Claims. The first electric motor and the second electric motor, any one of claims 1 to 5, characterized in that the temperature of said first motor and the second electric motor is operated such that the following motor allowable temperature previously determined, respectively 2. A control device for a vehicle power transmission device according to item 1.

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