JP5293665B2 - Vehicle drive control device - Google Patents

Description

  The present invention includes an electric differential unit having a differential mechanism capable of operating a differential action, such as a hybrid vehicle, and a transmission unit provided in a power transmission path from the electric differential unit to a drive wheel. The present invention relates to a technical field of a vehicle drive control device.

  As a drive control device for this type of vehicle, for example, in Patent Document 1, etc., when charging is limited when charging, so-called input limiting WIN, or when supplying power is limited, In the case of the so-called output limit WOUT, a technique for matching the shift speed of the stepped transmission unit with the shift speed of the continuously variable transmission unit is disclosed.

  As a drive control device for this type of vehicle, for example, Patent Document 2 discloses a technique for suppressing changes in engine speed so that the power balance of a storage battery is appropriate at the time of shifting.

  Further, as a drive control device for this type of vehicle, for example, Patent Document 3 discloses a technique for reducing the torque input to the stepped transmission unit at the time of shifting.

JP 2007-118727 A JP 2007-118698 A JP 2006-017033 A

  However, according to Patent Document 1 or 2 described above, for example, the rotational speeds of the continuously variable transmission unit and the stepped transmission unit are calculated, and the engagement pressure between the continuously variable transmission unit and the stepped transmission unit is changed. Complicated control such as synchronizing the two causes computation load and delays in the control process, resulting in an imbalance in power transfer between the storage battery and the motor, resulting in reduced durability of the storage battery There is a technical problem that the possibility of doing so increases.

  Therefore, the present invention has been made in view of, for example, the above-described problems. For example, in a hybrid vehicle, drive control of a vehicle that can perform gear shifting more appropriately when charging / discharging of a power storage device is restricted. It is an object to provide an apparatus.

  In order to solve the above-described problems, a vehicle drive control device according to the present invention has a first rotating electrical machine and three distribution elements that can be differentially rotated with respect to each other, and one of these two distribution elements. A power distribution mechanism in which the internal combustion engine is connected to the first rotary electric machine on the other side, the second rotary electric machine connected to the remaining distribution elements of the power distribution mechanism, and the remaining distribution elements of the power distribution mechanism A power transmission device connected to the first rotating electrical machine or the second rotating electrical machine, or a power storage device for charging power generated by the first rotating electrical machine or the second rotating electrical machine, An output member for outputting power to the drive wheels, a speed change mechanism provided in a power transmission path from the transmission member to the output member, and having a plurality of differentially rotatable elements, and traveling of the vehicle Based on state Determining means for determining a first shift pattern which is a combination when shifting from one gear stage of the transmission mechanism to another gear stage different from the one gear stage, and supplying the electric power or charging the electric power Is changed from the determined first shift pattern to a second shift pattern having a smaller number of shift stages compared to the first shift pattern (for example, “from the third speed gear stage to the first speed gear stage”). And a control means for controlling the speed change mechanism so as to change the gear shift to “shift from the third gear to the second gear”.

  Here, the speed change mechanism according to the present invention means a mechanism that is provided in the power transmission path from the transmission member to the output member and has a plurality of elements that can be differentially rotated with respect to each other. Typically, the speed change mechanism according to the present invention means a speed change device such as a stepped speed change device that changes a ratio between the rotation speed of the transmission member and the rotation speed of the output member.

  For example, it is a combination when shifting from one gear stage of the speed change mechanism to another gear stage different from one gear stage based on the running state of the vehicle by a determining means configured with a memory, a processor, etc. A first shift pattern is determined. Here, the “shift pattern” according to the present invention means a combination when shifting from one gear stage to another gear stage different from the one gear stage. Typically, a downshift from a third gear to a first gear, a downshift from a third gear to a second gear, a second gear to a third gear, Examples of combinations of selecting two different ones of the first speed gear stage, the second speed gear stage, and the third speed gear stage, such as upshifting to the right side, can be given. Further, the “first shift pattern” according to the present invention means a shift pattern determined based on the traveling state of the vehicle. The traveling state means a quantitative or qualitative state relating to traveling of the vehicle such as a target speed, target acceleration, target driving force, or target driving power required for the vehicle.

  For example, the control means configured to include a memory, a processor, or the like is configured such that when power supply or power charging is restricted, the first shift pattern determined from the determined first shift pattern is smaller than the first shift pattern. The speed change mechanism is controlled so as to change to the two speed change pattern. Here, the “number of shift stages” according to the present invention means a number determined based on the number of gear stages that are passed through when shifting from one gear stage to another gear stage. Typically, the number of gears may mean a number obtained by adding 1 to the number of gears that are passed through when shifting from one gear to another. More typically, the number of shift stages in the downshift from the third gear to the first gear is two. This is because, when downshifting from the third gear to the first gear, only one second gear is passed, so by adding 1 to this one, This is because 2 is obtained as the number of stages.

  Therefore, changing from the first shift pattern to the second shift pattern is, for example, a downshift shift from the third speed gear stage to the first speed gear stage. This is a downshift from the 3rd gear to the 2nd gear, meaning that the gear shift is changed to the second shift pattern in which the number of gears is 1.

  If power supply or power charging is restricted in the power storage device, for example, the rotational speed in a continuously variable transmission configured by an internal combustion engine, a first rotating electrical machine, a second rotating electrical machine, and a power distribution mechanism For example, the electric power exchanged between the first rotating electrical machine and the power storage device or the second rotating electrical machine by various control processes in the hybrid vehicle such as approaching the rotational speed of the speed change mechanism such as a stepped transmission. In the case where the electric power exchanged with the power storage device is set within an allowable range, the following technical problems arise. That is, in the control process in such a hybrid vehicle, the calculation load becomes high and the control process is delayed, and the electric power exchanged between the first rotating electrical machine and the power storage device and the second rotating electrical machine There arises a problem that it is technically difficult to properly balance the power exchange between the power and the power storage device.

  On the other hand, according to the present invention, when the power supply or the charging of the electric power is restricted in the power storage device, the control means starts from the first shift pattern and has a smaller number of shift stages than the first shift pattern. The speed change mechanism is controlled so as to change to the two speed change pattern.

  By simply changing the speed change pattern in such a speed change mechanism, it is possible to respond quickly to restrictions in power supply or power charge while suppressing an increase in calculation load in the control process. . Typically, it responds quickly to a sudden change in the power exchanged between the first rotating electrical machine and the power storage device, or a sudden change in the power delivered between the second rotary electrical machine and the power storage device. Is possible.

  Typically, due to the downshift of the speed change mechanism, the rotation speed of the rotation shaft connecting the transmission member and the speed change mechanism, that is, the input shaft of the speed change mechanism is increased. Due to the decrease in the control load accompanying the decrease in the number of shift stages in the changed second shift pattern, it is possible to respond promptly and reliably to the transient decrease in the rotational speed of the first rotating electrical machine. Thereby, under the state where charging / discharging of the power storage device is restricted, it is possible to effectively suppress the rotation speed of the first rotating electrical machine from falling below the allowable rotation speed (that is, the negative allowable rotation speed). .

  Alternatively, typically, the rotational speed of the rotation shaft connecting the transmission member and the transmission mechanism, that is, the input shaft of the transmission mechanism is increased by downshifting the transmission mechanism. Due to the decrease in the control load accompanying the decrease in the number of shift stages in the changed second shift pattern, it is possible to respond quickly and reliably to the transient increase in the rotational speed of the second rotating electrical machine. Thereby, under the state where charging / discharging of the power storage device is restricted, the rotation speed of the second rotating electric machine exceeds the allowable rotation speed (that is, the positive-side allowable rotation speed), or the rotation speed of the second rotating electric machine is It is possible to effectively suppress the stagnation in the high rotation range.

  Alternatively, typically, the rotation speed of the rotation shaft connecting the transmission member and the transmission mechanism, that is, the input shaft of the transmission mechanism is reduced by the upshift of the transmission mechanism. Due to the decrease in the control load accompanying the decrease in the number of shift stages in the changed second shift pattern, it is possible to quickly and surely respond to the transient increase in the rotational speed of the first rotating electrical machine. Accordingly, it is possible to effectively suppress the rotation speed of the first rotating electrical machine from exceeding the allowable rotation speed (that is, the positive-side allowable rotation speed) under a state where charging / discharging of the power storage device is limited. .

  As described above, even when a shift is performed under a state where power supply or power charging is limited in the power storage device, the first rotating electrical machine can be changed by simply changing the shift pattern in the transmission mechanism. It is possible to quickly and reliably reduce the rotation speed within the allowable rotation speed range, and to quickly and surely reduce the power exchanged between the first rotating electric machine and the power storage device in driving or power generation of the first rotating electric machine. it can. In substantially the same manner, even when a shift is performed under a state where power supply or power charging is restricted in the power storage device, the rotational speed of the second rotating electrical machine is quickly set within the allowable rotational speed range. In the driving of the second rotating electrical machine or power generation, the power exchanged between the second rotating electrical machine and the power storage device can be quickly and reliably reduced.

  As a result, it is possible to quickly realize an appropriate transmission / reception balance between the power transferred between the first rotating electrical machine and the power storage device and the power transferred between the second rotating electrical machine and the power storage device. Can do.

  As a result of the above, it is possible to achieve both a reliable limitation in power supply or power charging and an effective improvement in durability of the power storage device.

  In one aspect of the vehicle drive control apparatus according to the present invention, the control means is limited in the supply of the electric power or the charging of the electric power, and the determined number of shift stages of the first shift pattern is two or more. If so, the shift mechanism is controlled so as to prohibit the shift according to the first shift pattern and change to the second shift pattern.

  According to this aspect, it is possible to suppress a rapid change in the rotational speed of the input shaft of the speed change mechanism, and consequently, a rapid change in the rotational speed of the first rotating electrical machine or the rotational speed of the second rotating electrical machine. Can be suppressed appropriately. Thereby, the change of the electric power exchanged between a 1st rotary electric machine and an electrical storage apparatus can be made slow. Or the change of the electric power exchanged between a 2nd rotary electric machine and an electrical storage apparatus can be made slow.

  In another aspect of the vehicle drive control apparatus according to the present invention, the control means is configured such that the supply of electric power or the charging of the electric power is restricted, and the number of shift stages of the first shift pattern is two or more. The speed change mechanism is controlled to change the speed one step at a time.

  According to this aspect, since the progress of the shift by the speed change mechanism can be delayed, the change in the electric power exchanged between the first rotating electrical machine and the power storage device can be made slow. Or the change of the electric power exchanged between a 2nd rotary electric machine and an electrical storage apparatus can be made slow.

  In another aspect of the vehicle drive control apparatus according to the present invention, in addition to controlling the speed change mechanism so that the control means changes from the first speed change pattern to the second speed change pattern, the transmission member The driving state of the internal combustion engine and / or the rotating state of the first rotating electrical machine and / or the rotating state of the second rotating electrical machine are controlled so as to reduce the torque transmitted from the engine to the transmission mechanism.

  According to this aspect, as the torque transmitted from the transmission member to the transmission mechanism is reduced, the force transmitted between the elements in the transmission mechanism can be reduced. As a result, it is possible to effectively suppress an increase in the impact force generated at the time of shifting, and therefore it is possible to effectively improve the durability of the friction material of each element in the transmission mechanism.

  In another aspect of the vehicle drive control device according to the present invention, the control means is configured to supply electric power based on a charge capacity (so-called SOC (State Of Charge)) of the power storage device as a case where supply of the electric power is restricted. When the supply amount is outside the predetermined range, the transmission mechanism is controlled to change from the first shift pattern to the second shift pattern.

  According to this aspect, the case where the supply of electric power is restricted (in the case of so-called output restriction WOUT) is specified with high accuracy according to the charge capacity of the power storage device, and the first shift pattern that is a downshift is changed from the first shift pattern. It is possible to appropriately switch to the two shift patterns.

  In another aspect of the vehicle drive control device according to the present invention, the control means is configured to control the power based on a charge capacity (so-called SOC (State Of Charge)) of the power storage device as a case where charging of the power is restricted. When the charge amount is outside the predetermined range, the transmission mechanism is controlled to change from the first shift pattern to the second shift pattern.

  According to this aspect, the case where the charging of electric power is limited according to the charging capacity of the power storage device (in the case of so-called input limiting WIN) is specified with high accuracy, and the first shift pattern that is the upshift is changed from the first shift pattern. It is possible to appropriately switch to the two shift patterns.

  In another aspect of the vehicle drive control apparatus according to the present invention, the control means limits the supply of electric power or the charging of the electric power, and the determined first shift pattern is a downshift shift pattern. The shift mechanism is controlled to change from the first shift pattern to the second shift pattern.

  According to this aspect, the supply of electric power can be reliably restricted, and the durability of the power storage device can be effectively improved.

  In another aspect of the vehicle drive control apparatus according to the present invention, the control means is configured such that when the supply of the electric power or the charging of the electric power is restricted and the output power of the internal combustion engine exceeds a predetermined value, The speed change mechanism is controlled to change from the first speed change pattern to the second speed change pattern.

  Here, the predetermined value according to the present invention may typically mean output power required when the vehicle travels on a highway.

  According to this aspect, for example, when the vehicle is traveling at a high speed, the first rotating electrical machine changes as the rotational speed of the rotary shaft connecting the transmission member and the transmission mechanism changes significantly due to the transmission of the transmission mechanism. The rotational speed of the second rotating electrical machine or the rotational speed of the second rotating electrical machine can be effectively suppressed by the reduction in the control load accompanying the reduction in the number of shift stages in the changed second shift pattern. It is very useful.

  In another aspect of the vehicle drive control apparatus according to the present invention, the control means controls the speed change mechanism to prohibit a speed change as a change to the second speed change pattern.

  According to this aspect, it is possible to eliminate a sudden change in the rotational speed of the input shaft of the speed change mechanism. As a result, a sudden change in the rotational speed of the first rotating electrical machine, or the rotational speed of the second rotating electrical machine. Rapid changes can be eliminated. Thereby, the electric power exchanged between the first rotating electrical machine and the power storage device can be prevented from changing. Alternatively, it is possible to prevent the electric power exchanged between the second rotating electrical machine and the power storage device from being changed.

  In another aspect of the vehicle drive control apparatus according to the present invention, the control means controls the speed change mechanism so as to delay the speed change as a change to the second speed change pattern.

  According to this aspect, the speed change by the speed change mechanism can be delayed, and the change in the electric power exchanged between the first rotating electrical machine and the power storage device can be made slow. Or the change of the electric power exchanged between a 2nd rotary electric machine and an electrical storage apparatus can be made slow.

  Such an operation and other advantages of the present invention will become apparent from the embodiments described below.

1 is a block diagram showing a basic configuration of a speed change mechanism 10 in a hybrid vehicle drive device according to an embodiment of the present invention. It is a table | surface explaining the combination of the action | operation of the hydraulic friction engagement apparatus used for the speed change action in the drive device of the hybrid vehicle which concerns on embodiment of this invention. It is a collinear diagram explaining the relative rotational speed of each gear stage in the hybrid vehicle drive device according to the embodiment of the present invention. It is a figure explaining the input / output signal of the electronic controller provided in the drive device of the hybrid vehicle which concerns on embodiment of this invention. It is a circuit diagram regarding the linear solenoid valve which controls the action | operation of each hydraulic actuator of the clutch C and the brake B among the hydraulic control circuits which concern on embodiment of this invention. It is an example of the shift operation apparatus operated in order to select the multiple types of shift position provided with the shift lever which concerns on embodiment of this invention. It is a functional block diagram explaining the principal part of the control action of the electronic control unit concerning the embodiment of the present invention. An example of a shift map used in the shift control of the hybrid vehicle drive device according to the embodiment of the present invention, an example of a drive force source map used in a drive force source switching control for switching between engine travel and motor travel, and those It is a graph which shows a relationship. It is a graph which shows an example of the fuel consumption map containing the optimal fuel consumption rate curve of the engine which concerns on embodiment of this invention. It is the flowchart which showed the flow of operation | movement in the drive control apparatus of the vehicle which concerns on embodiment of this invention. It is a figure which shows an example of the input-output restriction | limiting map calculated | required experimentally beforehand and determined with the electrical storage apparatus temperature which concerns on embodiment of this invention, and input-output restriction | limiting. It is a figure which shows an example of the correction coefficient map for input / output restriction | limiting calculated | required experimentally beforehand and determined with the charging capacity and the correction coefficient of an input / output restriction | limiting which concern on embodiment of this invention. It is a figure which shows an example of the motor output map calculated | required experimentally beforehand and determined with the motor temperature and motor output (drive / electric power generation) which concern on embodiment of this invention. 3 is a timing chart showing operation timings in the vehicle drive control apparatus according to the embodiment of the present invention.

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

(Basic structure of transmission mechanism)
FIG. 1 is a block diagram showing a basic configuration of a speed change mechanism 10 in a drive device for a hybrid vehicle according to an embodiment of the present invention. In FIG. 1, a transmission mechanism 10 includes an input shaft 14 as an input rotation member disposed on a common axis in a transmission case 12 (hereinafter referred to as case 12) as a non-rotation member attached to a vehicle body, The differential unit 11 as a continuously variable transmission unit directly connected to the input shaft 14 or indirectly through a pulsation absorbing damper (vibration damping device) (not shown), the differential unit 11 and the drive wheel 34 (FIG. 7). An automatic transmission unit 20 as a power transmission unit connected in series via a transmission member (transmission shaft) 18 in a power transmission path between the output transmission member and the output rotation member connected to the automatic transmission unit 20 As an output shaft 22 in series. The speed change mechanism 10 is preferably used in, for example, 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 that is an internal combustion engine such as a gasoline engine or a diesel engine is provided between a pair of drive wheels 34 and power from the engine 8 is part of a power transmission path. Is transmitted to the pair of drive wheels 34 through the differential gear device (final reduction gear) 32 (see FIG. 7) and the pair of axles. The transmission mechanism 10 includes an electronic control device 80 described later, and operates under the control of the electronic control device 80. Further, an example of the “transmission mechanism” according to the present invention is configured by the transmission mechanism 10 including the automatic transmission unit 20. An example of the “output member” according to the present invention is configured by the output shaft 22.

  Thus, in the transmission mechanism 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 via the pulsation absorbing damper is included in this direct connection. Since the speed change mechanism 10 is configured symmetrically with respect to its axis, the lower side is omitted in the skeleton diagram of FIG. The same applies to the following embodiments.

  The differential unit 11 is a mechanical mechanism that mechanically distributes the output of the engine 8 input to the input motor 14 (i) the first motor M1 and (ii) the output of the engine 8 to the first motor M1. And a power distribution mechanism 16 as a differential mechanism that distributes to the transmission member 18, and (iii) a second electric motor M2 that is operatively connected to rotate integrally with the transmission member 18. The first motor M1 and the second motor M2 of the present embodiment are so-called motor generators that also have a power generation function, but the first motor M1 has at least a generator (power generation) function for generating a reaction force, and the second motor M2 has at least a motor (electric motor) function for outputting driving force as a driving force source for traveling. An example of the “first rotating electrical machine” according to the present invention is configured by the first electric motor M1. An example of the “second rotating electrical machine” according to the present invention is configured by the second electric motor M2. An example of the “power distribution mechanism” according to the present invention is configured by the power distribution mechanism 16. In addition, an example of the “transmission member” according to the present invention is configured by the transmission member 18.

  The power distribution mechanism 16 is mainly configured by a single pinion type first planetary gear device 24 having a predetermined gear ratio ρ1 of about “0.418”, for example. The first planetary gear unit 24 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 via the first planetary gear P1. A first ring gear R1 meshing with S1 is provided as a rotating element (that is, an element). When the number of teeth of the first sun gear S1 is ZS1 and the number of teeth of the first ring gear R1 is ZR1, the gear ratio ρ1 is ZS1 / ZR1.

  In the power distribution mechanism 16, the first carrier CA1 is connected to the input shaft 14, that is, the engine 8, the first sun gear S1 is connected to the first electric motor M1, and the first ring gear R1 is connected to the transmission member 18. In the power distribution mechanism 16 configured as described above, the first sun gear S1, the first carrier CA1, and the first ring gear R1, which are the three elements of the first planetary gear device 24, can be rotated relative to each other, so that a differential action is achieved. Therefore, the output of the engine 8 is distributed to the first electric motor M1 and the transmission member 18, and a part of the distributed output of the engine 8 is used. Since the electric energy generated from the first electric motor M1 is stored and the second electric motor M2 is rotationally driven, the differential unit 11 (that is, the power distribution mechanism 16) is caused to function as an electrical differential device. For example, the differential unit 11 is in a so-called continuously variable transmission state (that is, an electric CVT state), and the rotation of the transmission member 18 is continuously changed regardless of the predetermined rotation of the engine 8. That is, the differential unit 11 is an electrically stepless variable gear whose ratio γ0 (that is, the rotational speed NIN of the input shaft 14 / the rotational speed N18 of the transmission member 18) is continuously changed from the minimum value γ0min to the maximum value γ0max. This is an electric differential unit that functions as a transmission.

  The automatic transmission unit 20 includes a single pinion type second planetary gear unit 26, a single pinion type third planetary gear unit 28, and a single pinion type fourth planetary gear unit 30, and serves as a stepped automatic transmission. It is a functioning planetary gear type multi-stage transmission. The second planetary gear unit 26 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 and has a predetermined gear ratio ρ2 of about “0.562”, for example. The third planetary gear device 28 includes a third sun gear S3 via 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 planetary gear P3. A third ring gear R3 that meshes with the gear, and has a predetermined gear ratio ρ3 of, for example, about “0.425”. The fourth planetary gear unit 30 includes a fourth sun gear S4, a fourth planetary gear P4, a fourth carrier gear CA4 that supports the fourth planetary gear P4 so as to rotate and revolve, and a fourth sun gear S4 via the fourth planetary gear P4. And has a predetermined gear ratio ρ4 of about “0.421”, for example. 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, the number of teeth of the third ring gear R3 is ZR3, the number of teeth of the fourth sun gear S4 is ZS4, When the number of teeth of the fourth ring gear R4 is ZR4, the gear ratio ρ2 is ZS2 / ZR2, the gear ratio ρ3 is ZS3 / ZR3, and the gear ratio ρ4 is ZS4 / ZR4.

  In the automatic transmission unit 20, the second sun gear S2 and the third sun gear S3 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 second carrier CA2 is selectively connected to the case 12 via the second brake B2, the fourth ring gear R4 is selectively connected to the case 12 via the third brake B3, The two ring gear R2, the third carrier CA3, and the fourth carrier CA4 are integrally connected to the output shaft 22, and the third ring gear R3 and the fourth sun gear S4 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 differential unit 11 (transmission member 18) are used to establish each gear stage (that is, the gear stage) of the automatic transmission unit 20, the first clutch C1 or the second clutch. It is selectively connected via C2. In other words, the first clutch C <b> 1 and the second clutch C <b> 2 are a power transmission path between the transmission member 18 and the automatic transmission unit 20, that is, a power transmission path from the differential unit 11 (that is, the transmission member 18) to the drive wheels 34. Is operated as an engagement device that selectively switches between a power transmission enabling state that enables power transmission through the power transmission path and a power transmission cutoff state that interrupts power transmission through the power transmission path. That is, when at least one of the first clutch C1 and the second clutch C2 is engaged, the power transmission path is brought into a power transmission enabled state, or the first clutch C1 and the second clutch C2 are released. Thus, the power transmission path is brought into a power transmission cutoff state.

  In addition, the automatic transmission unit 20 is substantially configured by performing clutch-to-clutch shift by releasing the disengagement-side engagement device and engaging the engagement-side engagement device to selectively establish each gear stage. A gear ratio γ (= rotational speed N18 of the transmission member 18 / rotational speed NOUT of the output shaft 22) that changes in an equal ratio is obtained for each gear stage.

  FIG. 2 is an operation chart for explaining a combination of operations of the hydraulic friction engagement device used for the speed change operation of the drive device of FIG. For example, as shown in the engagement operation table of FIG. 2, the first speed gear stage in which the gear ratio γ1 is the maximum value, for example, “3.357” is established by the engagement of the first clutch C1 and the third brake B3. Thus, the engagement of the first clutch C1 and the second brake B2 establishes the second speed gear stage in which the speed ratio γ2 is smaller than the first speed gear stage, for example, about “2.180”. The engagement of the clutch C1 and the first brake B1 establishes the third speed gear stage in which the speed ratio γ3 is smaller than the second speed gear stage, for example, about “1.424”. Engagement of the clutch C2 establishes the fourth speed gear stage in which the speed ratio γ4 is smaller than the third speed gear stage, for example, about “1.000”. In addition, when the second clutch C2 and the third brake B3 are engaged, the reverse gear stage (reverse speed change) 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”. Stage) is established. Further, the neutral "N" state is established by releasing the first clutch C1, the second clutch C2, the first brake B1, the second brake B2, and the third brake B3.

  The first clutch C1, the second clutch C2, the first brake B1, the second brake B2, and the third brake B3 (hereinafter referred to as the clutch C and the brake B unless otherwise specified) are conventional automatic transmissions for vehicles. A hydraulic friction engagement device as an engagement element often used in a machine, and a wet multi-plate type in which a plurality of friction plates stacked on each other are pressed by a hydraulic actuator, or an outer peripheral surface of a rotating drum One end of one or two bands wound around is composed of a band brake or the like that is tightened by a hydraulic actuator, and is for selectively connecting the members on both sides of the band brake.

  In the transmission mechanism 10 configured as described above, the differential unit 11 that functions as a continuously variable transmission and the automatic transmission unit 20 constitute a continuously variable transmission as a whole. Further, by controlling the gear ratio of the differential unit 11 to be constant, the differential unit 11 and the automatic transmission unit 20 can configure a state equivalent to a stepped transmission.

  Specifically, 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 at least one shift of the automatic transmission unit 20 is performed. The rotational speed input to the automatic transmission unit 20 with respect to the stage M (hereinafter referred to as the input rotational speed of the automatic transmission unit 20), that is, the rotational speed of the transmission member 18 (hereinafter referred to as the transmission member rotational speed N18) is changed steplessly. As a result, a continuously variable transmission ratio width is obtained at the gear stage M. Therefore, the overall gear ratio γT (= the rotational speed NIN of the input shaft 14 / the rotational speed NOUT of the output shaft 22) of the transmission mechanism 10 is obtained in a stepless manner, and the transmission mechanism 10 constitutes a continuously variable transmission. The overall speed ratio γT of the speed change mechanism 10 is a total speed ratio γT of the speed change mechanism 10 as a whole formed based on the speed ratio γ0 of the differential portion 11 and the speed ratio γ of the automatic speed change portion 20.

  For example, the transmission member rotational speed N18 is changed steplessly for each of the first to fourth gears and the reverse gear of the automatic transmission 20 shown in the engagement operation table of FIG. As a result, each gear stage has a continuously variable transmission ratio width. Therefore, the gear ratio between the gear stages can be continuously changed continuously, and the total gear ratio γT of the transmission mechanism 10 as a whole can be obtained continuously.

  Further, the gear ratio of the differential unit 11 is controlled to be constant, and the clutch C and the brake B are selectively engaged and operated, so that one of the first gear to the fourth gear or the reverse drive By selectively establishing the gear stage (reverse gear stage), a total gear ratio γT of the transmission mechanism 10 that changes approximately in a ratio is obtained for each gear stage. Therefore, a state equivalent to the stepped transmission is configured in the transmission mechanism 10.

  For example, when the gear ratio γ0 of the differential unit 11 is controlled to be fixed to “1”, the first to fourth gear stages of the automatic transmission unit 20 as shown in the engagement operation table of FIG. A total speed ratio γT of the speed change mechanism 10 corresponding to each of the speed gears and the reverse gear is obtained for each gear. Further, if the gear ratio γ0 of the differential unit 11 is controlled to be fixed to a value smaller than “1”, for example, about 0.7 in the fourth speed gear stage of the automatic transmission unit 20, the fourth speed gear stage Is obtained, for example, a total speed ratio γT of about “0.7”.

  FIG. 3 is a collinear diagram that can represent, on a straight line, the relative relationship between the rotational speeds of the rotating elements having different connection states for each gear stage in the speed change mechanism 10 including the differential portion 11 and the automatic speed change portion 20. The figure 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. X1 indicates zero rotation speed, the horizontal line X2 indicates the rotation speed “1.0”, that is, the rotation speed NE of the engine 8 connected to the input shaft 14, and the horizontal line XG indicates the rotation speed 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 correspond to the second rotation element (that is, the second element) RE2 in order from the left side. The relative rotational speed of the first sun gear S1, the first carrier CA1 corresponding to the first rotating element (ie, the first element) RE1, and the first ring gear R1 corresponding to the third rotating element (third element) RE3 is shown. And the distance between them is determined according to the gear ratio ρ1 of the first planetary gear unit 24. Further, the five vertical lines Y4, Y5, Y6, Y7, and Y8 of the automatic transmission unit 20 correspond to the fourth rotation element (ie, the fourth element) RE4 in order from the left and are connected to each other. The sun gear S2 and the third sun gear S3 are connected to the second carrier CA2 corresponding to the fifth rotating element (ie, the fifth element) RE5, and the fourth ring gear R4 corresponding to the sixth rotating element (ie, the sixth element) RE6. The second ring gear R2, the third carrier CA3, and the fourth carrier CA4 corresponding to and connected to the seventh rotating element (ie, the seventh element) RE7 are connected to the eighth rotating element (ie, the eighth element) RE8. And the third sun gear S4 and the fourth sun gear S4 are connected to each other, and the distance between them is the gear ratios ρ2, ρ3, ρ4 of the second, third, and fourth planetary gear devices 26, 28, and 30, respectively. According to each There. 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 unit 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 ρ1. Further, in the automatic transmission unit 20, the interval between the sun gear and the carrier is set to an interval corresponding to "1" for each of the second, third, and fourth 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 speed change mechanism 10 of the present embodiment is configured so that the power distribution mechanism 16 (that is, the differential unit 11) has the first rotating element RE1 ( That is, the first carrier CA1) is connected to the input shaft 14, that is, the engine 8, the second rotating element RE2 is connected to the first electric motor M1, and the third rotating element (that is, the first ring gear R1) RE3 is connected to the transmission member 18 and It is connected to the second electric motor M2, and is configured to transmit (input) the rotation of the input shaft 14 to the automatic transmission unit 20 via the transmission member 18. At this time, the relationship between the rotational speed of the first sun gear S1 and the rotational speed of the first ring gear R1 is indicated by an oblique straight line L0 passing through the intersection of Y2 and X2.

  For example, in the differential section 11, the first rotation element RE1 to the third rotation element RE3 are in a differential state in which they can rotate relative to each other, and are indicated by the intersections of the straight line L0 and the vertical line Y3. When the rotational speed of the one ring gear R1 is constrained by the vehicle speed V, the rotational speed of the first carrier CA1 indicated by the intersection of the straight line L0 and the vertical line Y2 is controlled by controlling the engine rotational speed NE. When it is raised or lowered, the rotational speed of the first sun gear S1 indicated by the intersection of the straight line L0 and the vertical line Y1, that is, the rotational speed of the first electric motor M1 is raised or lowered.

  Further, when the rotation speed of the first electric motor M1 is controlled so that the speed ratio γ0 of the differential section 11 is fixed to “1”, the rotation of the first sun gear S1 is set to the same rotation as the engine rotation speed NE. The straight line L0 is made to coincide with the horizontal line X2, and the rotation speed of the first ring gear R1, that is, the transmission member 18, is rotated at the same rotation as the engine rotation speed NE. Alternatively, the rotation of the first sun gear S1 is made zero by controlling the rotation speed of the first electric motor M1 so that the speed ratio γ0 of the differential unit 11 is fixed to a value smaller than “1”, for example, about 0.7. Then, the transmission member rotation speed N18 is rotated at a rotation speed higher than the engine rotation speed NE.

  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 section 20, when the differential section 11 makes the straight line L0 coincide with the horizontal line X2 and the same rotational speed as the engine rotational speed NE is input from the differential section 11 to the eighth rotational element RE8, it is shown in FIG. As described above, 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 rotating element RE8 and the horizontal line X2 and the rotational speed of the sixth rotating element RE6 are set. Of the first speed (1st) at the intersection of an oblique straight line L1 passing through the intersection of the vertical line Y6 and the horizontal line X1 and the vertical line Y7 indicating the rotational speed of the seventh rotation element RE7 connected to the output shaft 22. The rotational speed of the output shaft 22 is shown. 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 (2nd) is shown, and a seventh rotation coupled to the output shaft 22 and the oblique straight line L3 determined by engaging the first clutch C1 and the first brake B1. The rotation speed of the output shaft 22 of the third speed (3rd) is indicated by the intersection with the vertical line Y7 indicating the rotation speed of the element RE7, and is determined by the engagement of the first clutch C1 and the second clutch C2. The rotation speed of the output shaft 22 at the fourth speed (4th) is shown at the intersection of the straight line L4 and the vertical line Y7 indicating the rotation speed of the seventh rotation element RE7 connected to the output shaft 22.

  FIG. 4 illustrates a signal input to the electronic control device 80 for controlling the transmission mechanism 10 of the present embodiment and a signal output from the electronic control device 80. The electronic control unit 80 includes a so-called microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like, and performs signal processing according to a program stored in the ROM in advance while using a temporary storage function of the RAM. By performing the above, drive control such as hybrid drive control for the engine 8, the first and second electric motors M1, M2 and the shift control of the automatic transmission unit 20 is executed.

  The electronic control unit 80 indicates a signal indicating the engine water temperature TEMPW, the shift position PSH of the shift lever 52 (see FIG. 6), the number of operations at the “M” position, and the like from each sensor and switch as shown in FIG. Corresponding to the signal, the signal representing the engine speed NE, which is the rotational speed of the engine 8, the signal representing the gear ratio train set value, the signal for instructing the M mode (manual shift running mode), the signal representing the operation of the air conditioner, and the vehicle speed V A signal representing the rotational speed of the output shaft 22 (hereinafter referred to as output shaft rotational speed) NOUT, a signal representing the ATF temperature (hereinafter referred to as ATF temperature) TOIL, a signal representing the side brake operation, a signal representing the foot brake operation, catalyst A signal indicating the temperature, a signal indicating the accelerator opening Acc, which is the operation amount of the accelerator pedal corresponding to the driver's required output, and the cam angle Signal indicating snow mode setting, signal indicating vehicle longitudinal acceleration G, signal indicating auto cruise traveling, signal indicating vehicle weight (vehicle weight), signal indicating wheel speed of each wheel, first motor M1 Of the second motor M2 (hereinafter referred to as the second motor rotation speed) NM2, a signal indicating the rotation speed (hereinafter referred to as the second motor rotation speed) NM2, and the temperature of the first motor M1 (hereinafter referred to as the first motor rotation speed). A signal representing THM1 (referred to as “1 motor temperature”), a signal representing the temperature of the second motor M2 (hereinafter referred to as “second motor temperature”) THM2, and a signal representing the charge capacity (charging state) SOC of the power storage device 56 (see FIG. 7). Etc. are supplied respectively.

  A control signal from the electronic control device 80 to the engine output control device 58 (see FIG. 7) for controlling the engine output, for example, the throttle valve opening θTH of the electronic throttle valve 62 provided in the intake pipe 60 of the engine 8. A command for a drive signal to the throttle actuator 64 for operating the engine, a fuel supply amount signal for controlling the amount of fuel supplied to the intake pipe 60 or the cylinder of the engine 8 by the fuel injection device 66, and an ignition timing of the engine 8 by the ignition device 68 are commanded. Ignition signal, supercharging pressure adjustment signal for adjusting the supercharging pressure, electric air conditioner drive signal for operating the electric air conditioner, command signal for instructing the operation of the motors M1 and M2, and shift position for operating the shift indicator (Operation position) Display signal, gear ratio display signal for displaying gear ratio, snow mode A snow mode display signal for indicating, an ABS operation signal for operating an ABS actuator that prevents slipping of the wheel during braking, an M mode display signal for indicating that the M mode is selected, A valve command signal for operating an electromagnetic valve (linear solenoid valve) included in a hydraulic control circuit 70 (see FIGS. 5 and 7) to control the hydraulic actuator of the hydraulic friction engagement device of the automatic transmission 20; A signal for adjusting the line oil pressure PL by a regulator valve (pressure adjusting valve) provided in the oil pressure control circuit 70, and for operating an electric hydraulic pump that is a source of hydraulic pressure for adjusting the line oil pressure PL. Drive command signals, signals for driving the electric heater, signals to the cruise control computer, etc. are output respectively. Is done.

  FIG. 5 is a circuit relating to linear solenoid valves SL1 to SL5 for controlling the operation of the hydraulic actuators (hydraulic cylinders) AC1, AC2, AB1, AB2, and AB3 of the clutches C1 and C2 and the brakes B1 to B3 in the hydraulic control circuit 70. FIG.

  In FIG. 5, each hydraulic actuator AC1, AC2, AB1, AB2, AB3 has an engagement pressure PC1, PC2, PB1 corresponding to a command signal from the electronic control unit 80 by the linear solenoid valves SL1 to SL5. , PB2 and PB3 are respectively regulated and supplied directly. This line oil pressure PL is based on the hydraulic pressure generated from an electric oil pump (not shown) or a mechanical oil pump that is driven to rotate by the engine 30 as an original pressure, for example, by a relief type pressure regulating valve (regulator valve), and the accelerator opening Acc or throttle valve opening. The pressure is adjusted to a value corresponding to the engine load or the like represented by the degree θTH.

  The linear solenoid valves SL1 to SL5 are basically the same in configuration and are excited and de-energized independently by the electronic control unit 80, and the hydraulic pressures of the hydraulic actuators AC1, AC2, AB1, AB2, and AB3 are independently regulated. Thus, the engagement pressures PC1, PC2, PB1, PB2, and PB3 of the clutches C1 to C4 and the brakes B1 and B2 are controlled. In the automatic transmission unit 20, for example, as shown in the engagement operation table of FIG. 2, each gear stage is established by engaging a predetermined engagement device. In the shift control of the automatic transmission unit 20, for example, a so-called clutch-to-clutch shift is performed in which release and engagement of the clutch C and the brake B involved in the shift are controlled simultaneously.

  FIG. 6 is a diagram showing an example of a shift operation device 50 as a switching device for switching a plurality of types of shift positions PSH by an artificial operation. The shift operation device 50 includes a shift lever 52 that is disposed next to the driver's seat, for example, and is operated to select a plurality of types of shift positions PSH.

  The shift lever 52 is in a neutral state, that is, a neutral state in which the power transmission path in the transmission mechanism 10, that is, the automatic transmission unit 20 is interrupted, and a parking position “P (parking) for locking the output shaft 22 of the automatic transmission unit 20. ) ”, Reverse travel position“ R (reverse) ”for reverse travel, neutral position“ N (neutral) ”to establish neutral state where power transmission path in transmission mechanism 10 is cut off, automatic transmission mode established Of the speed change mechanism 10 obtained by the stepless speed change ratio width of the differential unit 11 and each gear stage that is automatically controlled to shift within the range of the first to fourth speed gears of the automatic transmission unit 20. A forward automatic shift travel position “D (drive)” for executing automatic shift control within a change range of the total gear ratio γT that can be shifted, or a manual shift travel mode (manual mode) Is established so as to be manually operated to a forward manual shift travel position “M (manual)” for setting a so-called shift range for limiting the high-speed shift stage in the automatic shift control of the automatic transmission unit 20. Yes.

  In association with the manual operation of the shift lever 52 to each shift position PSH, the shift gears in the reverse gear stage “R”, neutral “N”, forward gear stage “D” shown in the engagement operation table of FIG. For example, the hydraulic control circuit 70 is electrically switched so as to be established.

  In the shift positions PSH 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 operation table, the first clutch C1 and the first clutch C1 and the first clutch C1 are configured so that the vehicle in which the power transmission path in the automatic transmission 20 is cut off so that both the first clutch C1 and the second clutch C2 are released cannot be driven. This is a non-driving position for selecting switching to the power transmission cutoff state of the power transmission path by the two 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 52 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 52 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 52 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 in which 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.

(Electronic control device)
FIG. 7 is a functional block diagram for explaining the main part of the control function by the electronic control unit 80. As shown in FIG. 7, the electronic control unit 80 includes a hybrid control unit 84, a hydraulic control circuit 70, a stepped shift control unit 82, a charge / discharge limit shift control unit 96, a charge / discharge limit determination unit 98, which will be described later. In addition, the motor output limit determining means 100 is provided. An example of “control means” and “decision means” according to the present invention is constituted by this electronic control device 80.

  In FIG. 7, the stepped shift control means 82 is a pre-stored upshift line (V) stored in advance with the vehicle speed V and the output torque TOUT of the automatic transmission unit 20 as variables as shown in FIGS. 8 (a) and 8 (b). The shift of the automatic transmission unit 20 based on the vehicle state indicated by the actual vehicle speed V and the required output torque TOUT of the automatic transmission unit 20 from the relationship (shift line diagram, shift map) having a solid line) and a downshift line (dotted line). Is determined, i.e., the shift stage of the automatic transmission unit 20 to be shifted is determined, and automatic shift control of the automatic transmission unit 20 is performed so that the determined shift stage is obtained. FIG. 8 is a graph (FIG. 8A) showing the relationship between the vehicle speed V in the downshift according to this embodiment and the output torque TOUT of the automatic transmission unit 20, and the vehicle speed V in the upshift. 8 is a graph (FIG. 8B) showing the relationship between the output torque TOUT and the output torque TOUT of the automatic transmission unit 20.

  The solid lines L12, L23, and L34 in FIGS. 8A and 8B indicate the transition from the first speed (that is, 1st in FIG. 2) to the second speed (that is, 2nd in FIG. 2). A shift line from the second speed to the third speed (that is, 3rd in FIG. 2) and a shift line from the third speed to the fourth speed (that is, 4th in FIG. 2) are shown. The dotted lines L43, L32, and L21 in FIGS. 8A and 8B indicate a shift from the fourth speed to the third speed, a shift from the third speed to the second speed, and a second speed to the first speed. The shift lines to are shown respectively. In particular, an alternate long and short dash line L21 'in FIG. 8A indicates a corrected shift line from the second speed to the first speed. By this correction, as indicated by the upward arrow AR3 in FIG. 8A, the shift from the third speed to the first speed can be corrected to the shift from the third speed to the second speed.

  In addition, a one-dot chain line L23 'in FIG. 8B indicates a corrected shift line from the second speed to the third speed. By this correction, as indicated by the downward arrow AR1 in FIG. 8B, the shift from the first speed to the third speed can be corrected to the shift from the first speed to the second speed.

  At this time, the stepped shift control means 82 engages and / or engages the hydraulic friction engagement device involved in the shift of the automatic transmission unit 20 so that the shift stage is achieved, for example, according to the engagement table shown in FIG. A clutch-to-clutch shift is executed by releasing a release command (shift output command, hydraulic pressure command), that is, by releasing the release-side engagement device involved in the shift of the automatic transmission unit 20 and engaging the engagement-side engagement device. Command to output to the hydraulic control circuit 70. In accordance with the command, for example, the hydraulic control circuit 70 releases the disengagement side engagement device and engages the engagement side engagement device so that the shift of the automatic transmission unit 20 is executed. The linear solenoid valve SL is actuated to actuate the hydraulic actuator of the hydraulic friction engagement device involved in the speed change.

  The hybrid control unit 84 functions as a differential unit control unit and operates the engine 8 in an efficient operating range, while distributing the driving force between the engine 8 and the second electric motor M2 and the first electric motor M1. The gear ratio γ0 of the differential unit 11 as an electric continuously variable transmission is controlled by changing the reaction force generated by the power generation so as to be optimized. For example, at the traveling vehicle speed V at that time, the target (request) output of the vehicle is calculated from the accelerator opening Acc and the vehicle speed V as the driver's required output amount, and the total required from the target output and the required charging value of the vehicle. Calculate the target output, calculate the target engine output in consideration of transmission loss, auxiliary load, assist torque of the second motor M2, etc. so as to obtain the total target output, and obtain the target engine output. The engine 8 is controlled so as to be the speed NE and the engine torque TE, and the power generation amount of the first electric motor M1 is controlled.

  For example, the hybrid control means 84 executes the control in consideration of the gear position of the automatic transmission unit 20 for improving power performance and fuel consumption. In such hybrid control, in order to match the engine rotational speed NE determined for operating the engine 8 in an efficient operating range with the vehicle speed V and the rotational speed of the transmission member 18 determined by the gear position of the automatic transmission unit 20. The differential unit 11 is caused to function as an electric continuously variable transmission. That is, the hybrid control means 84 is configured to achieve both drivability and fuel efficiency during continuously variable speed travel within the two-dimensional coordinates formed by the engine rotational speed NE and the output torque (engine torque) TE of the engine 8. For example, a target output (total target output) is set so that the engine 8 is operated along an optimum fuel consumption rate curve (fuel consumption map, relationship) of the engine 8 as shown by a dotted line in FIG. The target value of the total gear ratio γT of the speed change mechanism 10 is determined so that the engine torque TE and the engine speed NE for generating the engine output necessary for satisfying the required driving force) are satisfied. In order to obtain the gear ratio of the automatic transmission section 20, the transmission ratio γ0 of the differential section 11 is controlled so that the total transmission ratio γT is continuously variable within the changeable range. To control to.

  At this time, the hybrid control means 84 supplies the electric energy generated by the first electric motor M1 to the power storage device 56 and the second electric motor M2 through the inverter 54, so that the main part of the power of the engine 8 is mechanically transmitted to the transmission member 18. 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 54, 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. An example of the “power storage device” according to the present invention is configured by the power storage device 56.

  In particular, when the shift control of the automatic transmission unit 20 is executed by the stepped shift control means 82, the transmission mechanism 10 before and after the shift is accompanied by the step change of the transmission ratio of the automatic transmission unit 20. The total gear ratio γT is changed stepwise. By changing the total speed ratio γT stepwise, that is, by changing the speed ratio rather than continuously, it becomes possible to change the drive torque more quickly than the continuous change of the total speed ratio γT. . On the other hand, there is a possibility that a shift shock may occur or the engine speed NE cannot be controlled along the optimum fuel consumption rate curve, resulting in a deterioration in fuel consumption.

  Therefore, the hybrid control means 84 shifts in a direction opposite to the direction of change of the gear ratio of the automatic transmission unit 20 in synchronization with the shift of the automatic transmission unit 20 so that the step change of the total gear ratio γT is suppressed. Shifting of the differential section 11 is executed so that the ratio changes. In other words, the hybrid control means 84 synchronizes with the shift control of the automatic transmission unit 20 so that the total transmission ratio γT of the transmission mechanism 10 continuously changes before and after the automatic transmission unit 20 shifts. Execute. For example, the hybrid control unit 84 controls the shift of the automatic transmission unit 20 to form a predetermined total transmission ratio γT so that the total transmission ratio γT of the transmission mechanism 10 does not change transiently before and after the automatic transmission unit 20 shifts. In synchronism with this, the shift control of the differential unit 11 is executed so that the gear ratio is changed stepwise in the opposite direction to the change direction corresponding to the step change of the gear ratio of the automatic transmission unit 20. To do.

  From another viewpoint, even if the shift of the automatic transmission unit 20 is executed and the gear ratio of the automatic transmission unit 20 is changed stepwise, the hybrid control unit 84 changes the operating point of the engine 8 before and after the shift. Therefore, the speed ratio γ0 of the differential section 11 is controlled so as not to occur. For example, curves P1, P2, and P3 shown in FIG. 9 are examples of the equal power line P in the engine 8, and the point A indicates the fuel efficiency (optimum fuel efficiency) of the engine 8 when the required engine output P2 is generated. It is an example of an operating point of the engine 8, that is, a driving state of the engine 8, which is defined by the engine rotational speed NE and the engine torque TE set based on the engine rotational speed NE. Then, the hybrid control means 84 does not change the operating point of the engine 8 as indicated by the point A in FIG. 9 before and after the automatic transmission unit 20 shifts, that is, the operating point of the engine 8 is the optimum fuel consumption rate curve. A so-called equal power shift is performed to shift the differential unit 11 so that the equal power is maintained along the line. More specifically, the hybrid control means 84 performs throttle control so as to maintain the engine torque TE substantially constant during the shift of the automatic transmission unit 20, and maintains the engine speed NE substantially constant. In addition, the first motor rotation speed NM1 is changed in the opposite direction to the change in the second motor rotation speed NM2 accompanying the shift of the automatic transmission unit 20.

  Note that, as indicated by the point A in FIG. 9 described above, the equal power shift means that the operating point of the engine 8 is along the optimum fuel consumption rate curve and the equal power is maintained before and after the shift of the automatic transmission unit 20. Therefore, if the operating point of the engine 8 does not follow the optimum fuel consumption rate curve before and after the automatic transmission 20 is changed, even if the same power is maintained, It may be included in the non-equal power shift.

  Further, the hybrid control means 84 controls, for example, the first motor rotation speed NM1 by the electric CVT function of the differential section 11 to maintain the engine rotation speed NE substantially constant regardless of whether the vehicle is stopped or traveling. Or can be controlled to rotate at an arbitrary rotational speed. In other words, the hybrid control means 84 can control the rotation of the first motor rotation speed NM1 to an arbitrary rotation speed while maintaining the engine rotation speed NE substantially constant or controlling the rotation speed to an arbitrary rotation speed. For example, as can be seen from the nomograph of FIG. 3, when the hybrid control means 84 increases the engine speed NE while the vehicle is running, the hybrid motor means 84 sets the second motor speed NM2 restrained by the vehicle speed V (drive wheel 34). The first motor rotation speed NM1 is increased while maintaining substantially constant.

  Further, the hybrid control means 84 controls the opening and closing of the electronic throttle valve 62 by the throttle actuator 64 for the throttle control, and controls the fuel injection amount and the injection timing by the fuel injection device 66 for the fuel injection control. For control, a command for controlling the ignition timing by the ignition device 68 such as an igniter is output to the engine output control device 58 alone or in combination, and the output control of the engine 8 is executed so as to generate the necessary engine output. An engine output control means is functionally provided.

  For example, the hybrid controller 84 basically drives the throttle actuator 60 based on the accelerator opening Acc from a previously stored relationship (not shown), and increases the throttle valve opening θTH as the accelerator opening Acc increases. The throttle control is executed as follows. Further, the engine output control device 58 controls the opening and closing of the electronic throttle valve 62 by the throttle actuator 64 for throttle control according to the command from the hybrid control means 84, and the fuel injection by the fuel injection device 66 for fuel injection control. The engine torque control is executed by controlling the ignition timing by an ignition device 68 such as an igniter for controlling the ignition timing.

  Further, the hybrid control means 84 can drive the motor by the electric CVT function (differential action) of the differential portion 11 regardless of whether the engine 8 is stopped or in an idle state. For example, the hybrid control means 84 uses the driving power source for driving stored in advance as a variable with the vehicle speed V and the output torque TOUT of the automatic transmission 20 as shown in FIGS. 8A and 8B. The actual vehicle speed V and the required output of the automatic transmission unit 20 from the relationship (driving force source switching diagram, driving force source map) having a boundary line between the engine traveling region and the motor traveling region for switching between the motor 2 and the second electric motor M2. Based on the vehicle state indicated by the torque TOUT, it is determined which of the motor travel region and the engine travel region, and the motor travel or the engine travel is executed. The driving force source map indicated by the solid line A in FIGS. 8A and 8B is stored in advance together with, for example, the shift maps indicated by the solid line and the dotted line in FIGS. 8A and 8B. . As described above, the motor traveling by the hybrid control means 84 is relatively low output in which the engine efficiency is generally poor as compared with the high torque range, as is apparent from FIGS. 8 (a) and 8 (b). It is executed in the torque TOUT region, that is, the low engine torque TE region, or in the vehicle speed region where the vehicle speed V is relatively low, that is, in the low load region.

  The hybrid control means 84 controls the first motor rotation speed NM1 at a negative rotation speed so as to suppress the drag of the stopped engine 8 and improve the fuel efficiency when the motor is running, for example, the first motor M1. Is set to a no-load state, and the engine speed NE is maintained at zero or substantially zero as required by the electric CVT function (differential action) of the differential section 11.

  Further, even in the engine travel region, the hybrid control means 84 supplies the second motor M2 with the electric energy from the power storage device 56 in addition to or instead of the electric energy from the first motor M1 by the electric path described above. The so-called torque assist for assisting the power of the engine 8 is possible by driving the second electric motor M2 and applying torque to the drive wheels 34.

  Further, the hybrid control means 84 makes the first electric motor M1 in a no-load state and freely rotates, that is, idles, so that the differential unit 11 cannot transmit torque, that is, the power transmission path in the differential unit 11 is interrupted. It is possible to make the state equivalent to the state in which the output from the differential unit 11 is not generated. That is, the hybrid control means 84 can place the differential motor 11 in a neutral state (neutral state) in which the power transmission path is electrically cut off by setting the first electric motor M1 to a no-load state.

  Further, the hybrid control means 84 controls the engine rotation speed NE to a predetermined rotation speed by controlling the first motor rotation speed NM1 when shifting the automatic transmission unit 20. For example, when the hybrid control means 84 maintains the engine rotation speed NE substantially constant during the shift of the automatic transmission unit 20, the second control associated with the shift of the automatic transmission unit 20 while maintaining the engine rotation speed NE substantially constant. The first motor rotation speed NM1 is changed in the opposite direction to the change in the motor rotation speed NM2.

  Generally, when the automatic transmission unit 20 performs a shift, the operating point of the engine 8 is substantially changed before and after the shift so that the operating point of the engine 8 is operated along the optimum fuel consumption rate curve by the hybrid control unit 84. The first motor rotation speed NM1 is controlled in consideration of the gear position of the automatic transmission unit 20 so as to be maintained constant, and the differential unit 11 is shifted. At this time, the electric power generated by the first electric motor M1 when the first electric motor rotation speed NM1 is controlled is supplied to the power storage device 56 and the second electric motor M2 through the inverter 54.

  Here, the power storage device 56 can be charged or discharged (hereinafter referred to as chargeable / dischargeable) power (power), that is, input restriction or output restriction (hereinafter referred to as input / output restriction) in accordance with the power storage device temperature THBAT and the charge capacity SOC. Since WIN / WOUT changes, it is necessary to limit charging or discharging (hereinafter referred to as charge / discharge) of the power storage device 56 based on the input / output limit WIN / WOUT so as not to reduce durability. Alternatively, the output PM2 of the second electric motor M2 is limited because the possible output (power) PM2 changes according to the second electric motor temperature THM2. It is necessary to limit the output of the second electric motor M2 so as to drive within the range of the possible output PM2.

  Then, when charge / discharge restriction of the power storage device 56 or output restriction of the second electric motor M2 is applied, the electric power supplied from the power storage device 56 when the first electric motor M1 is driven or the electric power of the first electric motor M1. There is a possibility that the power balance with the power supplied to the power storage device 56 and the second motor M2 during power generation may not be balanced, and the first motor rotation speed NM1 is appropriately set when the automatic transmission 20 is shifted. Therefore, there is a risk that the shift shock will increase. Apart from this, even when the output of the first electric motor M1 is limited, there is a possibility that the first electric motor rotation speed NM1 cannot be controlled appropriately when the automatic transmission 20 is shifted.

  Therefore, in the present embodiment, when charging / discharging of the power storage device 56 that supplies or charges power during driving or power generation of the first electric motor M1 is limited, compared to when charging / discharging of the power storage device 56 is not limited. The charging / discharging limiting shift control means 96 that determines the shift of the automatic transmission unit 20 is provided so that the charge / discharge power of the power storage device 56 is reduced.

  Under the cooperative control of the hybrid control means 84 and the stepped speed change control means 82 based on the speed change judgment by the charge / discharge restriction speed change control means 96, the speed change mechanism 10 can change the first speed change pattern or the second speed change pattern. The gear shift is executed.

  If the power supply or the charging of power is restricted in the power storage device 56, for example, various control processes in the hybrid vehicle such as bringing the rotational speed in the differential unit 11 close to the rotational speed in the automatic transmission unit 20 When the electric power exchanged between the first electric motor M1 and the electric storage device 56 or the electric power exchanged between the second electric motor M2 and the electric storage device 56 is within an allowable range by the following technique, Problems arise. That is, in the control process in such a hybrid vehicle, the calculation load becomes high and the control process is delayed, and the electric power exchanged between the first electric motor M1 and the power storage device 56 and the second electric motor There arises a problem that it is technically difficult to properly balance the transmission / reception between the electric power exchanged between M2 and the power storage device 56.

  On the other hand, according to the present embodiment, based on the shift determination by the charge / discharge limiting shift control means 96, under the cooperative control of the hybrid control means 84 and the stepped shift control means 82, the speed change mechanism 10 executes a shift of the first shift pattern or the second shift pattern. That is, the charge / discharge restriction determination unit 98 determines whether or not the power transfer of the power storage device 56 is restricted, that is, whether the charge / discharge of the power storage device 56 is restricted. When it is determined that the power transfer of the power storage device 56 is restricted, under the cooperative control of the hybrid control unit 84 and the stepped shift control unit 82, the transmission mechanism 10 The second shift pattern is changed to the second shift pattern having a smaller number of shift stages than the first shift pattern, and the shift of the second shift pattern is executed. On the other hand, when it is not determined that the power transfer of the power storage device 56 is restricted, the transmission mechanism 10 starts from the first transmission pattern under the cooperative control of the hybrid control unit 84 and the stepped transmission control unit 82. The shift of the first shift pattern is executed without changing to the second shift pattern.

  By simply changing the speed change pattern in the speed change mechanism 10 as described above, it is possible to quickly respond to a limitation in power supply or power charge while suppressing an increase in calculation load in the control process. is there. Typically, a rapid change in power exchanged between the first motor M1 and the power storage device 56 or a rapid change in power exchanged between the first motor M1 and the power storage device 56 is quick. It is possible to respond to

  Typically, the downshift of the transmission mechanism 10 increases the rotational speed of the rotation shaft that connects the transmission member 18 and the transmission mechanism 10, that is, the input shaft of the transmission mechanism. Due to the decrease in the control load accompanying the decrease in the number of shift stages in the changed second shift pattern, it is possible to respond quickly and reliably to the transient decrease in the rotational speed of the first electric motor M1 with this increase. Accordingly, it is possible to effectively suppress the rotation speed of the first electric motor M1 from being lower than the allowable rotation speed (that is, the negative-side allowable rotation speed) in a state where charging / discharging of the power storage device 56 is limited. it can.

  Alternatively, typically, the rotational speed of the rotation shaft connecting the transmission member 18 and the transmission mechanism 10, that is, the input shaft of the transmission mechanism 10 is increased by the downshift of the transmission mechanism 10. Due to the decrease in the control load accompanying the decrease in the number of shift stages in the changed second shift pattern, it is possible to quickly and reliably respond to the transient increase in the rotational speed of the second electric motor M2 with this increase. As a result, the rotation speed of the second electric motor M2 exceeds the allowable rotation speed (that is, the positive-side allowable rotation speed) under the state where charging / discharging of the power storage device 56 is restricted, or the rotation speed of the second electric motor M2 Can be effectively suppressed from staying in the high rotation range.

  Alternatively, typically, the rotation speed of the rotation shaft connecting the transmission member 18 and the transmission mechanism 10, that is, the input shaft of the transmission mechanism 10 is decreased by the upshift of the transmission mechanism 10. Due to the decrease in the control load accompanying the decrease in the number of shift stages in the changed second shift pattern, it is possible to respond promptly and reliably to the transient increase in the rotational speed of the first electric motor M1 accompanying this decrease. This effectively suppresses the rotation speed of the first electric motor M1 from exceeding the allowable rotation speed (that is, the positive-side allowable rotation speed) under a state where charging / discharging of the power storage device 56 is limited. it can.

  As described above, the first electric motor can be obtained by simply changing the shift pattern in the transmission mechanism 10 even when a shift is performed in a state where the supply of electric power or the charging of electric power is restricted in the power storage device 56. The rotation speed of M1 is quickly and reliably within the range of the allowable rotation speed, and the electric power exchanged between the first motor M1 and the power storage device 56 is quickly and reliably reduced in driving or power generation of the first motor M1. can do. In substantially the same manner, even when a shift is performed in a state where power supply or power charging is restricted in the power storage device 56, the rotational speed of the second electric motor M2 is quickly kept within the allowable rotational speed range. In addition, in the driving or power generation of the second electric motor M2, the electric power exchanged between the second electric motor M2 and the power storage device 56 can be quickly and reliably reduced.

  As a result, it is possible to quickly realize an appropriate transfer balance between the power transferred between the first electric motor M1 and the power storage device 56 and the power transferred between the second motor M2 and the power storage device 56. can do.

  As a result, the durability of the power storage device 56 can be effectively improved.

(Operational principle of vehicle drive unit)
Next, the operation principle of the vehicle drive control apparatus according to the present embodiment will be described with reference to FIGS. FIG. 10 is a flowchart showing an operation flow in the vehicle drive control apparatus according to the embodiment of the present invention. The operation shown in FIG. 10 is repeatedly executed at a predetermined cycle such as several microseconds.

  As shown in FIG. 10, first, it is determined whether or not the drag state of the engine 8 is a normal state under the control of the hybrid control means 84 (step S101). Typically, for example, a state where the drag state of the engine 8 is normal means a state where the degree of drag of the engine 8 is less than a predetermined value. More typically, it means a state in which the temperature of the engine oil is high and the viscosity of the engine oil is low.

  As a result of the determination in step S101 described above, when it is determined that the engine 8 is in a normal state where the degree of dragging is below a predetermined value (step S101: Yes), the drive as shown in FIG. Based on the force source map, it is determined whether the traveling state of the vehicle is an engine traveling state (step S102). Here, when it is determined that the traveling state of the vehicle is the engine traveling state (step S102: Yes), the charging / discharging of the power storage device 56 is further restricted under the control of the charge / discharge limiting shift control means 96. It is determined whether or not there is (step S103). Typically, it is determined whether or not power delivery between power storage device 56 and first electric motor M1 is restricted, and power delivery between power storage device 56 and second electric motor M2 is restricted. It is determined whether or not there is.

  More typically, in the state where the delivery of power is restricted, the state of the input restriction WIN in which the power charged in the power storage device 56 is restricted and the power discharged from the power storage device 56 are There is a state of output restriction WOUT, which is a restricted state. The state of the input / output restriction that promotes the occurrence of a problem differs depending on whether the shift generated in the automatic transmission unit 20 is an upshift or a downshift. In other words, the upshift shift promotes the occurrence of a problem in the input limit WIN state. On the other hand, the downshift shift promotes the occurrence of problems in the state of the output limit WOUT.

  More typically, the charge / discharge restriction determination unit 98 calculates the input restriction WIN and the output restriction WOUT based on the power storage device temperature THBAT and the charge capacity SOC, and the input restriction WIN is set in advance as the charge restriction determination value. Charging / discharging of power storage device 56 is restricted based on whether at least one of input restriction threshold value WINth or less and output restriction value WOUT is less than output restriction threshold value WOUTth set in advance as a discharge restriction determination value is established. It is determined whether or not it has been done.

  FIG. 11 shows a relationship (input / output restriction map) obtained and determined experimentally in advance between the power storage device temperature THBAT and the input / output restriction WIN / WOUT. FIG. 12 is a graph showing the relationship (input / output limiting correction coefficient map) determined in advance and experimentally determined between the charging capacity SOC and the correction coefficient of the input / output limiting WIN / WOUT (FIG. 12A). And FIG. 12B). Then, the charge / discharge restriction determination means 98 calculates the basic values of the input restriction WIN and the output restriction WOUT based on the power storage device temperature THBAT from the input / output restriction map of FIG. 11, for example, and the output restriction of FIG. The input restriction correction coefficient and the output restriction correction coefficient are calculated based on the charge capacity SOC from the correction coefficient map for FIG. 12 and the input restriction correction coefficient map of FIG. 12B, respectively, and the input restriction WIN and the output restriction WOUT are calculated. An input limit WIN and an output limit WOUT are calculated by multiplying the basic value by the input limit correction coefficient and the output limit correction coefficient, respectively.

  As a result of the determination in step S103 described above, when it is determined that charging / discharging of the power storage device 56 is restricted (step S103: Yes), for example, as shown in FIG. Based on the shift map, the shift stage of the automatic transmission unit 20 corresponding to the vehicle state is determined, and the shift stage of the automatic transmission unit 20 causes a problem in the input limit WIN state or the output limit WOUT state. It is determined whether or not it has occurred (step S104). Typically, the malfunction in the state of the input restriction WIN or the state of the output restriction WOUT is the transmission / reception of electric power between the first electric motor M1 and the power storage device 56 in accordance with the shift by the automatic transmission unit 20. In the transfer of power between the second electric motor M2 and the power storage device 56, the actual power transfer amount is significantly deviated from a desired value in consideration of the input limit WIN or the output limit WOUT. This means that charging / discharging of power in the device 56 is not in a desired state. In other words, the problem in the state of the input restriction WIN or the state of the output restriction WOUT is the electric power constituted by the first electric motor M1, the second electric motor M2, and the power storage device 56 as the automatic transmission unit 20 shifts. It may mean that the system voltage in the system is outside the desired range.

  As a result of the determination in step S104, when it is determined that a problem has occurred in the input limit WIN state or the output limit WOUT state due to the shift of the automatic transmission unit 20 (step S104: Yes), further, the motor output Under the control of the limit determining means 100, for example, due to heat generation or the like, it is determined whether or not output limitation is performed in the second electric motor M2 in addition to or instead of the first electric motor M1 (step S105).

  Typically, the electric motor output restriction determination means 100 determines whether or not the output of the first electric motor M1 and / or the second electric motor M2 is restricted. For example, the motor output limit determination means 100 can be used to determine the actual temperature (motor output map) relationship between the motor temperature THM and the motor output (driving / power generation) PM, as shown in FIG. The motor outputs PM1 and PM2 that can be output based on the motor temperatures THM1 and THM2, respectively, are calculated, and the first motor output PM1 is equal to or lower than a first motor output limit threshold PM1th that is set in advance as an output limit determination value. Whether or not the output of the motor M1 / M2 is limited based on whether or not at least one of the second motor output PM2 is equal to or less than a second motor output limit threshold PM2th set in advance as an output limit determination value Determine.

  As a result of the determination in step S105 described above, when it is determined that output limitation is performed in the second electric motor M2 in addition to or instead of the first electric motor M1 (step S105: Yes), the charge / discharge limiting shift control means Under the control of 96, a change to the second shift pattern having a smaller number of shift stages compared to the first shift pattern is performed, and the shift of the second shift pattern is executed (step S106).

  Here, the “shift pattern” according to the present embodiment means a combination when shifting from one gear stage to another gear stage different from the one gear stage. Typically, a downshift from a third gear to a first gear, a downshift from a third gear to a second gear, a second gear to a third gear, Examples of combinations of selecting two different ones of the first speed gear stage, the second speed gear stage, and the third speed gear stage, such as upshifting to the right side, can be given.

  Further, the “number of shift stages” according to the present embodiment means a number obtained by adding 1 to the number of gear stages that are passed through when shifting from one gear stage to another gear stage. Typically, the number of gears in the downshift from the third gear to the first gear is two. This is because, when downshifting from the third gear to the first gear, only one second gear is passed, so by adding 1 to this one, This is because 2 is obtained as the number of stages. In substantially the same manner, the number of shift stages in the downshift from the third gear to the second gear is one. This is because, when downshifting from the 3rd gear to the 2nd gear, the other gears do not go through, in other words, only 0 gears go through. This is because 1 is obtained as the number of gears by adding 1.

  Note that “when it is determined that charging / discharging of the power storage device 56 is restricted (step S103: Yes)”, “in the state of the input restriction WIN or the state of the output restriction WOUT depending on the shift of the automatic transmission unit 20”. When it is determined that a problem has occurred (step S104: Yes) "and" when it is determined that output restriction has been implemented in the second electric motor M2 in addition to or instead of the first electric motor M1 (step S105: Yes). ")" Is true, an example of "when the supply of power or charging of the power is limited" according to the present invention is configured.

  Returning to the above step S106 again, typically, when the downshift shift from the third gear to the first gear is instructed as the shift of the first shift pattern, the shift at the time of charge / discharge limitation is performed. Under the control of the control means 96, a downshift from the third gear to the second gear is performed as a shift of the second shift pattern having a smaller number of shift stages compared to the first shift pattern. The transmission mechanism 10 is controlled.

  Or, typically, when a downshift from the third gear to the first gear is instructed as a shift of the first shift pattern, under the control of the charge / discharge limiting shift control means 96, As a shift of the second shift pattern, in addition to the downshift from the third gear to the second gear, the downshift from the second gear to the first gear is performed. The transmission mechanism 10 is controlled. As a result, the charge / discharge limiting shift control means 96 advances the shift in the downshift from the third gear to the first gear, and downshifts from the normal third gear to the first gear. The transmission mechanism 10 including the automatic transmission unit 20 is controlled so as to be delayed as compared with the transmission. In other words, the charge / discharge limiting shift control means 96 takes a period of time until the downshift shift from the third gear to the first gear is completed, from the normal third gear to the first gear. The speed change mechanism 10 including the automatic speed change unit 20 is controlled so as to be slower than the downshift to the right side.

  Typically, when the upshift shift from the first gear to the third gear is instructed as the shift of the first shift pattern, the second shift under the charge / discharge limiting shift control means 96 is performed. The speed change mechanism 10 is controlled so that the upshift speed change from the first speed gear stage to the second speed gear stage is performed as the shift of the shift pattern.

  Alternatively, typically, when the upshift shift from the first gear to the third gear is instructed as the shift of the first shift pattern, under the control of the charge / discharge limiting shift control means 96, As the shift of the second shift pattern, in addition to the upshift from the first gear to the second gear, the upshift from the second gear to the third gear is performed. The transmission mechanism 10 is controlled. As a result, the charge / discharge limiting shift control means 96 performs the upshift from the first gear to the third gear in the upshift from the first gear to the third gear. The transmission mechanism 10 including the automatic transmission unit 20 is controlled so as to be delayed as compared with the transmission. In other words, the charge / discharge limiting shift control means 96 takes a period of time until the upshift shift from the first gear to the third gear is completed, from the normal first gear to the third gear. The speed change mechanism 10 including the automatic speed change unit 20 is controlled so as to be slower than the upshift to the upshift.

  More typically, as shown in FIG. 14 to be described later, when a shift from the first gear to the second gear is performed as the shift of the second shift pattern that is an upshift, During the inertia phase, the opening degree of the electronic throttle valve of the engine 8 may be reduced, and the output torque of the engine 8 may be reduced. Here, the inertia phase according to the present embodiment means a traveling state in which the vehicle is traveling by inertia, regardless of the driving force from the engine 8, the first electric motor M1, and the second electric motor M2. By reducing the force transmitted between each element of the speed change mechanism 10 by the traveling state of the inertia phase, the amount of change in the rotational speed of the first electric motor M1 before and after the speed change is made smaller than in the comparative example. Can do. Thereby, since durability of the friction material of each element of the speed change mechanism 10 can be effectively improved, it is very useful in practice. More typically, the transmission force between the elements of the speed change mechanism 10 that is generated when the rotational speed of the engine 8 is reduced as the output torque generated by the engine 8 decreases during the inertia phase. Can be reduced. As a result, it is possible to effectively suppress an increase in the impact force generated at the time of shifting, and thus it is possible to effectively improve the durability of the friction material of each element of the transmission mechanism 10.

  In the upshift, when the gear stage is shifted one by one, it is not necessary to change the shift pattern. As a result, the possibility of fuel cut traveling due to the high rotational speed of the engine 8 can be reduced.

  On the other hand, as a result of the determination in step S103 described above, when it is not determined that charging / discharging of the power storage device 56 is restricted (step S103: No), for example, as shown in FIG. 8 under the control of the hybrid control means 84. Based on the correct shift map, the shift stage of the automatic transmission unit 20 corresponding to the vehicle state is determined, and it is determined whether or not a shift by the automatic transmission unit 20 has actually occurred (step S107). Here, when it is determined that the shift by the automatic transmission unit 20 has actually occurred (step S107: Yes), the shift of the first shift pattern described above is executed under the control of the charge / discharge limiting shift control means 96. (Step S108).

  On the other hand, as a result of the determination in step S101 described above, when it is determined that the drag state of the engine 8 is not normal, that is, when it is determined that the drag state of the engine 8 is abnormal (step S101). : No), under the control of the hybrid control means 84, for example, even if the vehicle state is the motor travel region in the driving force source map as shown in FIG. 8, the motor travel is prohibited and the engine travel is continued. Alternatively, switching from motor travel to engine travel is executed (step S109). This is because if the drag state of the engine 8 is abnormal, the engine rotational speed NE may not be maintained at zero or substantially zero during motor travel, and normal motor travel may not be performed. Because it is expensive.

  On the other hand, as a result of the determination in step S104 described above, as a result of the determination in step S104, it is not determined that a problem has occurred in the input limit WIN state or the output limit WOUT state due to the shift of the automatic transmission unit 20 (step S104). S104: No), as a result of the determination in step S105 described above, when it is not determined that the output limitation is implemented in the second electric motor M2 in addition to or instead of the first electric motor M1 (step S105: No), or As a result of the determination in step S107, if it is not determined that a shift by the automatic transmission unit 20 has actually occurred (step S107: No), this routine ends.

  Note that, as a result of the determination in step S104 described above, if it is determined that a problem has occurred in the input limit WIN state or the output limit WOUT state due to the shift of the automatic transmission unit 20 as a result of the determination in step S104 (step S104). (S104: No), as described above, the shift of the first shift pattern described above may be executed under the control of the charge / discharge limiting shift control means 96 (step S108).

(Operation timing of vehicle drive device)
Next, the operation timing of the vehicle drive control apparatus according to the present embodiment will be described with reference to FIG. FIG. 14 is a timing chart showing the operation timing in the vehicle drive control apparatus according to this embodiment. The solid line in FIG. 14 shows the case where the progress of the upshift from the first speed gear stage to the second speed gear stage according to the present embodiment is delayed, and the dotted line in FIG. 14 shows the comparative example. The case where the progress of the upshift from the first gear to the second gear is not delayed is shown. FIG. 14 shows a running state in which the engine 8 is used as a driving force source and the vehicle starts at the D position. Further, the solid line in FIG. 14 corresponds to this embodiment, and the chain line corresponds to a general example.

  As shown in FIG. 14, at time T <b> 1 along the time axis, it is determined that charging / discharging of power storage device 56 is limited under the control of charge / discharge limiting shift control means 96. Typically, it is determined that the power transfer between the power storage device 56 and the first electric motor M1 is restricted, or the power transfer between the power storage device 56 and the second electric motor M2 is restricted. It is determined. More typically, it is determined that the state of the input restriction WIN, which is a state in which the power charged in the power storage device 56 is restricted, is reached. More typically, it is determined that the storage battery (nickel metal hydride battery or lithium ion battery) is in the input restriction WIN state for some reason during traveling.

  Next, at time T2 along the time axis, under the control of the hybrid control means 84, the shift gear stage of the automatic transmission unit 20 corresponding to the vehicle state is determined based on, for example, a shift map as shown in FIG. It is determined that the upshift from the first gear to the second gear is performed.

  Next, at time T3 along the time axis, the hydraulic pressure at the element of the automatic transmission unit 20 corresponding to the first speed gear starts to decrease. In particular, this time T3 is a time point when the vehicle starts the traveling state of the inertia phase.

  Next, at time T4 along the time axis, the hydraulic pressure in the element of the automatic transmission unit 20 corresponding to the second speed gear starts to increase.

  Next, at time T5 along the time axis, the charge / discharge limiting shift control means 96 changes the progress in the upshift from the first gear to the second gear in the normal upshift according to the comparative example. The transmission mechanism 10 including the automatic transmission unit 20 is controlled so as to be delayed as compared with the transmission. In other words, the charge / discharge limiting shift control means 96 automatically sets the time required for completing the upshift from the first gear to the second gear to be delayed as compared with the normal upshift. The transmission mechanism 10 including the transmission unit 20 is controlled. Typically, the hydraulic pressure of the automatic transmission section 20 corresponding to the first speed gear stage, that is, the hydraulic pressure of the automatic transmission section 20 corresponding to the second speed gear stage as the release pressure of the first speed gear stage decreases. The so-called increase speed when the engagement pressure increases is made slower than the shift according to the comparative example (see the dotted line in FIG. 14), and the shift from the first gear to the second gear is performed. The progress of the upshift is delayed (see the solid line in FIG. 14). Subsequently, at time T6 along the time axis, the increase of the hydraulic pressure in the element of the automatic transmission unit 20 corresponding to the second speed gear stage is completed, and the upshift from the first speed gear stage to the second speed gear stage is completed. Is completed. It should be noted that the time T6x along the time axis corresponds to the second speed gear stage from the first speed gear stage when the progress of the upshift from the first speed gear stage to the second speed gear stage according to the comparative example is not delayed. Indicates the time when the upshift to 1 is completed.

  The change speed when the rotation speed of the first electric motor M1 increases due to the delay in the progress of the upshift from the first gear to the second gear according to the present embodiment is related to the comparative example. Compared with the case where the progress of the upshift from the first gear to the second gear is not slowed (see the dotted line in FIG. 14), it can be reduced (see the solid line in FIG. 14). . This effectively suppresses the rotation speed of the first electric motor M1 from exceeding the allowable rotation speed (that is, the positive-side allowable rotation speed) under a state where charging / discharging of the power storage device 56 is limited. it can.

  As described above, the rotational speed of the first electric motor M1 is within the allowable rotational speed range even when the speed change of the speed change mechanism 10 is performed in a state where power supply or power charging is restricted in the power storage device 56. In this way, in the drive or power generation of the first electric motor M1, the electric power exchanged between the first electric motor M1 and the power storage device 56 can be reduced. In substantially the same manner, when the speed change of the speed change mechanism 10 is performed under the state where the power supply or the charge of power is restricted in the power storage device 56, the rotation speed of the second electric motor M2 is set to the allowable rotation speed. The electric power exchanged between the second electric motor M2 and the power storage device 56 can be reduced in driving or power generation of the second electric motor M2.

  As a result, the durability of the power storage device 56 can be effectively improved.

  In particular, the rotational torque of the input shaft of the automatic transmission unit 20 is reduced in accordance with the control of the transmission mechanism 10 that slows the progress of the upshift from the first gear to the second gear. It's okay. Typically, the rotational torque of the input shaft of the automatic transmission unit 20 may be reduced by reducing the opening of the electronic throttle valve of the engine 8, and the ignition timing of the engine 8 may be retarded more than usual. Thus, the rotational torque of the input shaft of the automatic transmission unit 20 may be reduced.

  As a result, the degree of change in the rotational speed of the first electric motor M1 before and after the shift can be made smaller than that in the comparative example (see the dotted line in FIG. 14) (see the solid line in FIG. 14). Alternatively, the degree of change in the rotational speed of the second electric motor M2 before and after the shift can be made smaller than that in the comparative example (see the dotted line in FIG. 14) (see the solid line in FIG. 14). ). As a result, the durability of the power storage device 56 can be effectively improved, which is very useful in practice.

  In particular, the force transmitted between the elements of the speed change mechanism 10 according to the traveling state of the inertia phase by lowering the opening of the electronic throttle valve of the engine 8 after the start of the inertia phase and lowering the output torque of the engine 8. Decrease. Thereby, the amount of change in the rotational speed of the first electric motor M1 before and after the shift can be made smaller than in the comparative example, and the durability of the friction material of each element of the transmission mechanism 10 can be effectively improved. This is very useful in practice. More typically, as the output torque generated in the engine 8 decreases after the start of the inertia phase, the transmission force between the elements of the transmission mechanism that occurs when the rotational speed of the engine 8 is decreased is reduced. can do. As a result, it is possible to effectively suppress an increase in the impact force generated at the time of shifting, and thus it is possible to effectively improve the durability of the friction material of each element of the transmission mechanism 10.

  The present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit or idea of the invention that can be read from the claims and the entire specification, and vehicle drive control with such a change. The apparatus is also included in the technical scope of the present invention.

  The present invention includes an electric differential unit having a differential mechanism capable of operating a differential action, such as a hybrid vehicle, and a transmission unit provided in a power transmission path from the electric differential unit to a drive wheel. It can be used for a drive control device of a vehicle provided.

8: Engine 10: Transmission mechanism (vehicle drive device)
11: Electric differential unit 16: Power distribution mechanism (differential mechanism)
18: Transmission member 20: Automatic transmission unit (transmission unit, automatic transmission)
22: Output shaft 34: Drive wheel 56: Power storage device 70: Hydraulic control circuit 80: Electronic control device (control device)
84: Hybrid control means,
82: Stepped speed change control means 96: Charge / discharge restriction shift control means 98: Charge / discharge restriction determination means 100: Electric motor output restriction determination means M1: First electric motor M2: Second electric motor

Claims (10)

A first rotating electrical machine;
A power distribution mechanism having three distribution elements capable of differentially rotating with respect to each other, wherein one of two of these distribution elements is connected to the internal combustion engine and the first rotating electric machine to the other;
The second rotating electrical machine coupled to the remaining distribution elements of the power distribution mechanism;
A transmission member coupled to the remaining distribution elements of the power distribution mechanism;
A power storage device for supplying electric power to the first rotating electric machine or the second rotating electric machine or charging electric power generated by the first rotating electric machine or the second rotating electric machine;
An output member for outputting power to the drive wheels of the vehicle;
A transmission mechanism provided in a power transmission path from the transmission member to the output member and having a plurality of elements capable of differentially rotating with each other;
Determining means for determining a first shift pattern which is a combination when shifting from one gear stage of the transmission mechanism to another gear stage different from the one gear stage based on a running state of the vehicle;
When the supply of electric power or the charging of the electric power is restricted, the speed change mechanism is changed from the determined first speed change pattern to a second speed change pattern having a smaller number of speeds compared to the first speed change pattern. And a control means for controlling the vehicle.   The control means prohibits a shift by the first shift pattern when the supply of the electric power or the charging of the electric power is restricted and the determined number of shift stages of the first shift pattern is two or more, The vehicle drive control device according to claim 1, wherein the speed change mechanism is controlled to change to the second speed change pattern.   The control means controls the speed change mechanism so that the speed is changed step by step when the supply of electric power or the charging of the electric power is restricted and the number of speed steps of the first shift pattern is two or more. The drive control apparatus for a vehicle according to claim 1 or 2.   The control means controls the transmission mechanism to change from the first transmission pattern to the second transmission pattern, and further reduces the torque transmitted from the transmission member to the transmission mechanism. The driving state of the internal combustion engine and / or the rotating state of the first rotating electrical machine and / or the rotating state of the second rotating electrical machine are controlled. Vehicle drive control device.   The control means changes from the first shift pattern to the second shift pattern when the supply amount of power based on the charge capacity of the power storage device is out of a predetermined range as the supply of power is restricted. The vehicle drive control device according to any one of claims 1 to 4, wherein the speed change mechanism is controlled.   The control means changes the first shift pattern to the second shift pattern when the charge amount of the power based on the charge capacity of the power storage device is out of a predetermined range as the charge of the power is restricted. The vehicle drive control device according to any one of claims 1 to 5, wherein the speed change mechanism is controlled at the same time.   The control means changes from the first shift pattern to the second shift pattern when the supply of electric power or the charging of the electric power is restricted and the determined first shift pattern is a downshift shift pattern. The vehicle drive control device according to any one of claims 1 to 6, wherein the transmission mechanism is controlled to do so.   The control means changes the first shift pattern to the second shift pattern when the supply of electric power or the charging of the electric power is restricted and the output power of the internal combustion engine exceeds a predetermined value. The vehicle drive control device according to any one of claims 1 to 7, wherein the transmission mechanism is controlled.   The drive of a vehicle according to any one of claims 1 to 8, wherein the control means controls the speed change mechanism to prohibit a speed change as a change to the second speed change pattern. Control device.   The drive of a vehicle according to any one of claims 1 to 8, wherein the control means controls the speed change mechanism so as to delay a speed change as a change to the second speed change pattern. Control device.