JP6946889B2 - Control device for vehicle power transmission device - Google Patents

Description

According to the present invention, in a control device of a power transmission device for a vehicle provided with a first differential mechanism and a second differential mechanism, the first engaging element and the second engaging element are released, respectively, to provide a second rotary machine. The present invention relates to a technique for starting an engine by engaging an engaging element of either a first engaging element or a second engaging element from a single rotating machine traveling by a single drive of the above.

A first differential mechanism including a first rotating element, a second rotating element, and a third rotating element, and a second differential mechanism including a fourth rotating element, a fifth rotating element, and a sixth rotating element are provided. Vehicle power transmission devices are well known. For example, the vehicle power transmission device described in Patent Document 1 is that. In the vehicle power transmission device described in Patent Document 1, the power transmission path between the differential portion (corresponding to the second differential mechanism) whose differential state is controlled and the engine and the differential portion is set. It is disclosed that a transmission unit (corresponding to a first differential mechanism) capable of switching between low and high stages is provided.

International Publication No. 2013/11594

By the way, in the vehicle power transmission device of Patent Document 1, the engine (engine) is driven (started) by adding an engaging element that changes the connection state between the first differential mechanism and the second differential mechanism. It is considered possible to form a plurality of running modes capable of running (engine-driven running). For example, an engine when shifting from a single-rotating machine running running by a second rotating machine alone to an engine-driven running. There is room for consideration regarding the starting method of.

The present invention has been made in the background of the above circumstances, and an object of the present invention is for a vehicle capable of suitably starting an engine from running on a single rotary machine that runs on a single drive of a second rotary machine. The purpose is to provide a control device for a power transmission device.

The gist of the first invention is (a) a first differential mechanism including a first rotating element, a second rotating element, and a third rotating element, a fourth rotating element, a fifth rotating element, and a sixth. A second differential mechanism including a rotating element, a first engaging element that engages any two of the first rotating element to the third rotating element, and the second rotating element and the fourth rotating element. And a second engaging element that engages with any one of the fifth rotating elements, the third rotating element being connected to the sixth rotating element, and the fifth rotating element. Is connected to an output shaft, the first rotating element is connected to an engine, the fourth rotating element is connected to a first rotating machine, and the output shaft is connected to a second rotating machine. In the control device, (b) the first engaging element is released from the single rotating machine traveling by releasing the first engaging element and the second engaging element, respectively, and traveling by the independent drive of the second rotating machine. The amount of heat generated by either the first engaging element or the second engaging element when the engine is started by engaging either the element or the second engaging element. When is greater than or equal to a predetermined value, the engine is started by engaging any other engaging element of the first engaging element or the second engaging element , and (c) from the single rotary machine running. When the amount of heat generated by each of the first engaging element and the second engaging element is equal to or greater than the predetermined value when the engine is started by engaging the one engaging element, the engine is started. said engaging one of the engaging elements after the implementation of synchronous control to suppress the differential rotation of the engagement element of the one by the first rotating machine, by the first rotating machine in Rukoto to starting the engine.

According to the first invention, the first engaging element is derived from the traveling of a single rotating machine in which the first engaging element and the second engaging element are released and the second rotating machine is driven independently. Alternatively, when the engine is started by engaging any one of the second engaging elements, the amount of heat generated by the engaging element of either the first engaging element or the second engaging element is generated. When it is equal to or more than a predetermined value, the engine is started by engaging the other engaging element of the first engaging element or the second engaging element, and the one is engaged from the traveling of the single rotary machine. When the amount of heat generated by each of the first engaging element and the second engaging element is equal to or more than the predetermined value when the combined element is engaged to start the engine, the first rotating machine engaging said one of the engaging elements after the implementation of synchronous control to suppress the differential rotation of the engagement element of the one by, by the first rotating machine Ru is starting the engine. Therefore, the amount of heat generated by the one engaging element is equal to or greater than a predetermined value, and the frictional heat generated by the one engaging element when the one engaging element is engaged to start the engine is described. When the durability of one engaging element is likely to decrease, the engine is started by engaging the other engaging element of either the first engaging element or the second engaging element. Be done. Further, the amount of heat generated by the one engaging element is smaller than a predetermined value, and the frictional heat generated by the one engaging element when the one engaging element is engaged to start the engine is caused by the frictional heat generated by the one engaging element. If the durability of the engaging element is unlikely to decrease, the engine is started by engaging the one engaging element. As a result, the engine can be suitably started from the traveling of the single rotating machine, which travels by the independent driving of the second rotating machine, while suppressing the decrease in the durability of the one engaging element.

It is a figure explaining the schematic structure of each part which concerns on the traveling of the vehicle to which this invention is applied, and is the figure explaining the main part of the control system for controlling each part. It is a figure which shows an example of the hydraulic control circuit which controls the operating state of an engaging element. It is a figure which shows each operating state of each engaging element in each traveling mode. It is a collinear diagram in the single drive EV mode (forward). It is a collinear diagram in the single drive EV mode (reverse). It is a collinear diagram in the dual drive EV mode (forward). It is a collinear diagram in the dual drive EV mode (reverse). It is a collinear diagram in the standby mode in the U / D input split. It is a collinear diagram in the standby mode in the O / D input split. It is a collinear diagram in the emblem combined mode in the U / D input split. It is a collinear diagram in the emblem combined mode in the O / D input split. It is a collinear diagram in the forward running in the U / DHV mode of the HV running mode. It is a collinear diagram in the forward running in the O / DHV mode of the HV running mode. It is a collinear diagram in the reverse running in the U / DHV mode of the HV running mode, and is the case of the engine reverse input. It is a collinear diagram in the reverse running in the U / DHV mode of the HV running mode, and is the case of the engine forward rotation input. It is a collinear diagram in the reverse running in the O / DHV mode of the HV running mode, and is the case of the engine forward rotation input. It is a collinear diagram in the fixed stage mode of the HV driving mode, and is a case of direct connection. It is a collinear diagram in the fixed stage mode of the HV traveling mode, and is the case where the output shaft is fixed. It is a figure which shows an example of the running mode switching map used for the switching control of engine running and motor running, and is the case of running in the state which holds the battery capacity. It is a figure which shows an example of the running mode switching map used for the switching control of engine running and motor running, and is the case of running while consuming the battery capacity. The control operation in the case where the main part of the control operation of the electronic control device, that is, the first engaging element and the second engaging element are released and the engine is started from the single rotating machine running by the independent driving of the second rotating machine. It is a flowchart to explain. It is a figure which shows an example of the time chart when the flowchart of FIG. 21 is executed.

In one embodiment of the present invention, when the engine is started by engaging the first engaging element from the traveling of the single rotary machine, it occurs in each of the first engaging element and the second engaging element. When the amount of heat to be generated exceeds a predetermined value, the first engaging element is engaged after the first synchronous control for suppressing the differential rotation of the first engaging element by the first rotating machine is performed. The engine is started by the first rotating machine. Therefore, the amount of heat generated by each of the first engaging element and the second engaging element is equal to or more than a predetermined value, and the engaging element of the first engaging element or the second engaging element is engaged. There is a high possibility that the durability of the first engaging element or the second engaging element will decrease due to the frictional heat generated by the first engaging element or the second engaging element when the engine is started. In this case, after the first synchronous control is performed, the first engaging element is engaged and the engine is started by the first rotating machine.

Further, in one embodiment of the present invention, when the second engaging element is engaged to start the engine from the traveling of the single rotary machine, the first engaging element and the second engaging element are respectively. When the amount of heat generated in the above is equal to or greater than a predetermined value, the second engaging element is engaged after the second synchronous control for suppressing the differential rotation of the second engaging element is performed by the first rotating machine. , The engine is started by the first rotating machine. Therefore, the amount of heat generated by each of the first engaging element and the second engaging element is equal to or more than a predetermined value, and the engaging element of the first engaging element or the second engaging element is engaged. There is a high possibility that the durability of the first engaging element or the second engaging element will decrease due to the frictional heat generated by the first engaging element or the second engaging element when the engine is started. In this case, after the second synchronous control is performed, the second engaging element is engaged and the engine is started by the first rotating machine.

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

FIG. 1 is a diagram for explaining a schematic configuration of each part related to traveling of the vehicle 10 to which the present invention is applied, and is a diagram for explaining a main part of a control system for controlling each part. In FIG. 1, the vehicle 10 is driven by an engine (engine) 12, a first rotary machine MG1, a second rotary machine MG2, a power transmission device (vehicle power transmission device) 14, and a power transmission device (vehicle power transmission device) 14, which can be power sources for traveling. It is a hybrid vehicle equipped with wheels 16.

The engine 12 is a known internal combustion engine such as a gasoline engine or a diesel engine that burns a predetermined fuel to output power. The engine torque Te of the engine 12 is controlled by controlling the throttle opening or the operating state such as the intake air amount, the fuel supply amount, and the ignition timing by the electronic control device 90 described later.

The first rotary machine MG1 and the second rotary machine MG2 are so-called motor generators having a function as an electric motor (motor) for generating drive torque and a function as a generator (generator). The first rotating machine MG1 and the second rotating machine MG2 are provided in the vehicle 10 as a power storage device that receives and receives electric power via a power control unit 50 provided in the vehicle 10 having an inverter unit, a smoothing capacitor, and the like. The output torque (power running torque or regenerative torque) of each of the first rotary machine MG1 and the second rotary machine MG2 is connected to the battery unit 52 and the power control unit 50 is controlled by the electronic control device 90 described later. MG1 torque Tg and MG2 torque Tm are controlled.

The power transmission device 14 is provided in a power transmission path between the engine 12 and the drive wheels 16. The power transmission device 14 includes a first rotary machine MG1, a second rotary machine MG2, a first power transmission unit 20, a second power transmission unit 22, and the like in a case 18 which is a non-rotating member attached to a vehicle body. .. Further, the power transmission device 14 is a drive pinion via a propeller shaft 26 connected to an output shaft 24 which is an output rotating member of the first power transmission unit 20, a drive pinion 28 connected to the propeller shaft 26, and a differential gear 30. It includes a differential gear 32 that meshes with 28, a drive shaft 34 connected to the differential gear 32, and the like.

The first power transmission unit 20 is arranged coaxially with the input shaft 36, which is an input rotation member of the first power transmission unit 20 and is connected to the crankshaft of the engine 12, and the first differential mechanism 38, the first differential mechanism 38, The two differential mechanism 40, the first rotary machine MG1, the clutch (first engaging element) CL1, the brake (third engaging element) BR1, the clutch (second engaging element) CLc, and the like are provided.

The first differential mechanism 38 includes a first sun gear S1, a plurality of pairs of first pinion gears P1a and P1b that mesh with each other, and first carriers C1 and first pinion gears P1a and P1b that support the first pinion gears P1a and P1b so as to rotate and revolve. It is a known double pinion type planetary gear mechanism having a first ring gear R1 that meshes with the first sun gear S1 via the above, and functions as a differential mechanism that produces a differential action. The first differential mechanism 38 employs a double pinion type planetary gear mechanism in consideration of making the gear ratio ρ1 (the gear ratio ρ will be described later) appropriate, for example. Further, the second differential mechanism 40 meshes with the second sun gear S2 via the second carrier C2 and the second pinion gear P2 that support the second sun gear S2, the second pinion gear P2, and the second pinion gear P2 so as to rotate and revolve. It is a known single pinion type planetary gear mechanism having a second ring gear R2, and functions as a differential mechanism that produces a differential action.

In the first differential mechanism 38, the first carrier C1 is the first rotating element RE1 integrally connected to the input shaft 36 and the engine 12 is power-transmittedly connected via the input shaft 36. 1 Functions as an input rotating member of the differential mechanism 38. The first ring gear R1 is a second rotating element RE2 that is selectively connected to the case 18 via the brake BR1. The first sun gear S1 is a third rotating element RE3 connected to an input rotating member of the second differential mechanism 40 (that is, the second ring gear R2 of the second differential mechanism 40), and is an output of the first differential mechanism 38. Functions as a rotating member.

In the second differential mechanism 40, the second sun gear S2 is integrally connected to the rotor shaft 42 of the first rotating machine MG1, and serves as a reaction force element to which the first rotating machine MG1 is connected so as to be able to transmit power. This is the fourth rotating element RE4. The second carrier C2 is a fifth rotating element RE5 as an output element connected to the output shaft 24 (that is, provided to rotate integrally with the output shaft 24) and connected to the drive wheels 16. It functions as an output rotating member of the second differential mechanism 40. The second ring gear R2 is a sixth rotating element RE6 as an input element connected to an output rotating member of the first differential mechanism 38 (that is, the first sun gear S1 of the first differential mechanism 38), and is a second differential. It functions as an input rotating member of the mechanism 40.

The first carrier C1 and the first ring gear R1 are selectively connected via the clutch CL1. Further, the first ring gear R1 and the second carrier C2 are selectively connected via the clutch CLc. Therefore, the clutch CL1 is a first engaging element that selectively connects the first rotating element RE1 and the second rotating element RE2. Further, the clutch CLc is a second engaging element that selectively connects the second rotating element RE2 and the fifth rotating element RE5. Further, the brake BR1 is a third engaging element that selectively connects the second rotating element RE2 to the case 18. The clutch CL1, the brake BR1, and the clutch CLc are preferably wet friction engagement devices, and are multi-plate type hydraulic friction engagement devices whose engagement is controlled by a hydraulic actuator.

FIG. 2 shows an example of a main part of the hydraulic control circuit 60 provided in the vehicle 10 that controls the operating state (state of engagement, disengagement, etc.) of each engaging element (clutch CL1, brake BR1, clutch CLc). It is a figure which shows. In FIG. 2, the hydraulic control circuit 60 includes a primary regulator valve 62, linear solenoid valves SL1, SL2, SL3, and the like. The primary regulator valve 62 uses the oil pressure generated by the mechanical oil pump 64 (also referred to as MOP64) provided in the vehicle 10 as the main pressure, or the electric oil pump 66 (also referred to as EOP66) provided in the vehicle 10. ) Is used as the original pressure to adjust the line hydraulic pressure PL. The MOP 64 is connected to any rotating member (with the same agreement as the rotating element) of the power transmission device 14 that rotates with the rotation of the engine 12, and is driven by the engine 12 to supply oil pressure. The EOP 66 supplies oil pressure by being driven by an electronic control device 90 described later, for example, when the rotation of the engine 12 is stopped (for example, when the motor is running when the operation of the engine 12 is stopped). The linear solenoid valve SL1 regulates the engagement hydraulic pressure (also referred to as CL1 hydraulic pressure Pcl1) supplied to the clutch CL1 using the line hydraulic pressure PL as the original pressure. The linear solenoid valve SL2 regulates the engagement hydraulic pressure (also referred to as BR1 hydraulic pressure Pbr1) supplied to the brake BR1 using the line hydraulic pressure PL as the original pressure. The linear solenoid valve SL3 regulates the engagement hydraulic pressure (also referred to as CLc hydraulic pressure Pclc) supplied to the clutch CLc using the line hydraulic pressure PL as the main pressure. The linear solenoid valves SL1, SL2, and SL3 have basically the same configuration, and the electronic control device 90 independently excites, de-excites, and controls the current, and makes each of the hydraulic Pcl1, Pbr1, and Pclc independent. Adjust the pressure. The operating state of each engaging element (clutch CL1, brake BR1, clutch CLc) is switched according to the respective hydraulic pressures Pcl1, Pbr1, and Pclc supplied from the hydraulic control circuit 60.

Returning to FIG. 1, the first differential mechanism 38 is in a direct connection state, a reverse rotation speed change state of the engine 12, a neutral state (neutral state), and an internal lock state by switching each operating state of the clutch CL1 and the brake BR1. It is possible to form four states. Specifically, the first differential mechanism 38 is in a directly connected state in which each rotating element of the first differential mechanism 38 is integrally rotated in the engaged state of the clutch CL1. Further, in the first differential mechanism 38, when the brake BR1 is engaged, the rotation of the first ring gear R1 is set to zero [rpm], and the first sun gear S1 (first difference) with respect to the normal rotation of the engine rotation speed Ne. The output rotating member of the moving mechanism 38) is set to the reverse rotation speed change state of the engine 12 in which the rotation is negative. Further, the first differential mechanism 38 is in a neutral state in which the differential of the first differential mechanism 38 is allowed in the released state of the clutch CL1 and the released state of the brake BR1. Further, the first differential mechanism 38 is in an internal lock state in which each rotating element of the first differential mechanism 38 stops rotating in the engaged state of the clutch CL1 and the engaged state of the brake BR1.

The second differential mechanism 40 divides the power of the engine 12 input to the second ring gear R2 into the first rotary machine MG1 and the second carrier C2 (the distribution also agrees) in a state where the differential is allowed. It can function as a mechanism. Therefore, in the vehicle 10, the direct torque (also referred to as the engine direct torque) that is mechanically transmitted to the second carrier C2 by taking the reaction force of the engine torque Te input to the second ring gear R2 by the first rotary machine MG1. It is possible to run the engine with MG2 torque Tm by the second rotary machine MG2 driven by the generated power of the first rotary machine MG1 by the power divided into the first rotary machine MG1. As a result, the second differential mechanism 40 is known to control the gear ratio (gear ratio) by controlling the power control unit 50 by the electronic control device 90 described later and controlling the operating state of the first rotary machine MG1. Functions as an electric differential unit (electric continuously variable transmission). That is, the second differential mechanism 40 is an electric transmission mechanism in which the differential state is controlled by controlling the operating state of the first rotating machine MG1.

The first power transmission unit 20 can form an electric continuously variable transmission that operates at a power division ratio different from the power division ratio in the second differential mechanism 40. That is, in the first power transmission unit 20, in addition to the first sun gear S1 (third rotating element RE3) and the second ring gear R2 (sixth rotating element RE6) being connected, the clutch CLc is engaged. By connecting the first ring gear R1 (second rotating element RE2) and the second carrier C2 (fifth rotating element RE5), the first differential mechanism 38 and the second differential mechanism 40 become 1 An electric type that constitutes two differential mechanisms and operates the entire first differential mechanism 38 and the second differential mechanism 40 at a power division ratio different from the power division ratio of the second differential mechanism 40 alone. It is possible to function as a continuously variable transmission.

In the first power transmission unit 20, the first differential mechanism 38 in which the above-mentioned four states are formed and the second differential mechanism 40 are connected, and the vehicle 10 switches the operating state of the clutch CLc. In addition, it is possible to realize a plurality of driving modes described later.

In the first power transmission unit 20 configured in this way, the power of the engine 12 and the power of the first rotary machine MG1 are transmitted to the output shaft 24. Therefore, the engine 12 and the first rotary machine MG1 are connected to the drive wheels 16 via the first power transmission unit 20 so as to be able to transmit power.

The second power transmission unit 22 is arranged coaxially with the input shaft 36 (or the output shaft 24), and includes a second rotary machine MG2 and a reduction mechanism 44 connected to the output shaft 24. The reduction mechanism 44 uses a third ring gear R3 that meshes with the third sun gear S3 via a third carrier C3 and a third pinion gear P3 that support the third sun gear S3, the third pinion gear P3, and the third pinion gear P3 so as to rotate and revolve. It is a known single pinion type planetary gear mechanism having. The third sun gear S3 is an input element connected to the rotor shaft 46 of the second rotary machine MG2. The third ring gear R3 is a reaction force element connected to the case 18. The third carrier C3 is an output element connected to the output shaft 24. The reduction mechanism 44 configured in this way decelerates the MG2 rotation speed Nm and transmits it to the output shaft 24. As a result, in the second power transmission unit 22, the power of the second rotary machine MG2 is transmitted to the output shaft 24 without going through the first power transmission unit 20. Therefore, the second rotary machine MG2 is connected to the drive wheels 16 so as to be able to transmit power without going through the first power transmission unit 20. That is, the second rotary machine MG2 is a rotary machine that is connected to the drive shaft 34, which is an output rotating member of the power transmission device 14, so as to be able to transmit power without going through the first power transmission unit 20. The output rotating member of the power transmission device 14 is an output rotating member connected to the drive wheels 16, and in addition to the drive shaft 34, the output shaft 24, the propeller shaft 26, and the like are also agreed.

The power transmission device 14 configured in this way is suitably used for FR (front engine / rear drive) type vehicles. Further, in the power transmission device 14, the power of the engine 12, the power of the first rotary machine MG1 and the power of the second rotary machine MG2 are transmitted to the output shaft 24, and the differential gear 32 and the drive shaft 34 are transmitted from the output shaft 24. Etc. are sequentially transmitted to the drive wheels 16.

The vehicle 10 includes an electronic control device 90 as a controller including a control device of the vehicle 10 related to control of the engine 12, the power transmission device 14, and the like. The electronic control device 90 is configured to include, for example, a so-called microcomputer provided with a CPU, RAM, ROM, an input / output interface, etc., and the CPU follows a program stored in the ROM in advance while using the temporary storage function of the RAM. Various controls of the vehicle 10 are executed by performing signal processing. For example, the electronic control device 90 is designed to execute output control of the engine 12, the first rotating machine MG1, and the second rotating machine MG2, switching control of the traveling mode described later, and the like, and if necessary, the engine. It is divided into control, rotary machine control, hydraulic control, etc.

The electronic control device 90 includes various sensors provided in the vehicle 10 (for example, an engine rotation speed sensor 70, an output rotation speed sensor 72, an MG1 rotation speed sensor 74 such as a resolver, an MG2 rotation speed sensor 76 such as a resolver, and an accelerator open. Various signals based on the values detected by the degree sensor 78, shift position sensor 80, battery sensor 82, etc. (for example, engine rotation speed Ne, output rotation speed No, MG1 rotation speed, which is the rotation speed of the output shaft 24 corresponding to the vehicle speed V). Ng, MG2 rotation speed Nm, accelerator opening θacc, shift lever operation position (shift position) POSsh such as "P", "R", "N", "D", battery temperature THbat of battery unit 52 and battery charge Discharge current Ibat, battery voltage Vbat, etc.) are supplied. Further, from the electronic control device 90, various devices provided in the vehicle 10 (for example, an engine control device 54 such as a throttle actuator, a fuel injection device, and an ignition device, a power control unit 50, a hydraulic control circuit 60, an EOP 66, etc.) Command signal (for example, engine control command signal Se for controlling the engine 12, rotary machine control command signal Smg for controlling the first rotary machine MG1 and the second rotary machine MG2, each engaging element (clutch CL1, brake). The hydraulic control command signal Sp for controlling the operating state of the BR1 and the clutch CLc), the pump drive control command signal Sop for driving the EOP66, etc.) are output, respectively. The electronic control device 90 calculates the charge capacity SOC (also referred to as battery capacity SOC) of the battery unit 52 as a value indicating the charge state of the battery unit 52 based on, for example, the battery charge / discharge current Ibat and the battery voltage Vbat. ..

The electronic control device 90 includes a hybrid control means, that is, a hybrid control unit 92, and a power transmission switching means, that is, a power transmission switching unit 94, in order to realize control functions for various controls in the vehicle 10.

The hybrid control unit 92 controls the opening and closing of the electronic throttle valve, controls the fuel injection amount and the injection timing, outputs the engine control command signal Se that controls the ignition timing, so that the target torque of the engine torque Te can be obtained. The output control of the engine 12 is executed. Further, the hybrid control unit 92 outputs a rotary machine control command signal Smg for controlling the operation of the first rotary machine MG1 and the second rotary machine MG2 to the power control unit 50, and outputs the target torque of MG1 torque Tg and MG2 torque Tm. The output control of the first rotating machine MG1 and the second rotating machine MG2 is executed so that

The hybrid control unit 92 calculates the required drive torque based on the accelerator opening θacc and the vehicle speed V, and takes into consideration the required charging value (charging required power) and the like so that the engine operates with low fuel consumption and a small amount of exhaust gas. 12. The required drive torque is generated from at least one of the first rotary machine MG1 and the second rotary machine MG2.

The hybrid control unit 92 selectively establishes a motor running (EV running) mode and a hybrid running (HV running) mode (also referred to as an engine running mode) as running modes according to the running state. The EV running mode is a control that enables motor running in which at least one of the first rotating machine MG1 and the second rotating machine MG2 is used as a power source for running while the operation of the engine 12 is stopped. It is a style. The HV running mode is a control mode that enables HV running (engine running) in which at least the engine 12 is used as a power source for running (that is, the power of the engine 12 is transmitted to the drive wheels 16 to run). Even in a mode that does not assume the running of the vehicle 10, such as a mode in which the power of the engine 12 is converted into electric power by the power generation of the first rotary machine MG1 and the electric power is exclusively charged to the battery unit 52, the engine Since 12 is in the driving state, it is included in the HV driving mode.

The power transmission switching unit 94 controls the operating states of the clutch CL1, the brake BR1, and the clutch CLc based on the traveling mode established by the hybrid control unit 92. The power transmission switching unit 94 engages and / or disengages the clutch CL1, the brake BR1, and the clutch CLc, respectively, so that the power transmission for traveling in the traveling mode established by the hybrid control unit 92 is possible. The hydraulic control command signal Sp to be operated is output to the hydraulic control circuit 60.

Here, the traveling modes that can be executed by the vehicle 10 will be described with reference to FIGS. 3 and 4 to 18. FIG. 3 is a chart showing each operating state of the clutch CL1, the brake BR1, and the clutch CLc in each traveling mode. In the chart of FIG. 3, ○ indicates the engagement of the engaging elements (clutch CL1, brake BR1, clutch CLc), blank indicates release, and Δ indicates the engine in which the engine 12 in the stopped operation state is rotated. It indicates that when a brake (also called an engine brake) is used in combination, one of them may be engaged or both may be engaged depending on the situation. Further, "G" indicates that the rotating machine (MG1, MG2) mainly functions as a generator, and "M" mainly causes the rotating machine (MG1, MG2) to function as a motor when driving, and mainly as a generator during regeneration. It is shown to function as. As shown in FIG. 3, the vehicle 10 can selectively realize the EV traveling mode and the HV traveling mode as the traveling modes. The EV drive mode includes a single drive EV mode, which is a control mode in which a motor can run with the second rotary machine MG2 as a single power source, and a motor run with the first rotary machine and the second rotary machine MG2 as a power source. It has two modes, a dual drive EV mode, which is a possible control mode. The HV driving modes are an overdrive (O / D) input split mode (hereinafter referred to as O / DHV mode), an underdrive (U / D) input split mode (hereinafter referred to as U / DHV mode), and a fixed stage mode. It has three modes:

FIG. 4-FIG. 18 is a collinear diagram capable of relatively representing the rotation speeds of the rotating elements RE1-RE6 in each of the first differential mechanism 38 and the second differential mechanism 40. In this co-line diagram, the vertical lines Y1-Y4 representing the rotation speed of each rotating element are in order from the left toward the paper surface, and the vertical line Y1 is the second sun gear which is the fourth rotating element RE4 to which the first rotating machine MG1 is connected. The rotation speed of S2, the vertical line Y2 is the rotation speed of the first carrier C1 which is the first rotation element RE1 to which the engine 12 (see "ENG" in the figure) is connected, and the vertical line Y3 is via the brake BR1. The rotational speed of the first ring gear R1 which is the second rotating element RE2 selectively connected to the case 18, and the second rotating element RE5 which is the fifth rotating element RE5 connected to the output shaft 24 (see "OUT" in the figure). The vertical line Y4 indicates the rotational speed of the carrier C2, and the vertical line Y4 indicates the rotational speed of the first sun gear S1 which is the third rotating element RE3 and the second ring gear R2 which is the sixth rotating element RE6, respectively. The second rotary machine MG2 is connected to the output shaft 24 via a reduction mechanism 44. The arrows in the white squares (□) indicate MG1 torque Tg, the arrows in white circles (◯) indicate engine torque Te, and the arrows in black circles (●) indicate MG2 torque Tm. Further, the clutch CL1 that selectively connects the first carrier C1 and the first ring gear R1 is shown in white, the clutch CL1 is in the released state, and the clutch CL1 is shown in hatching (diagonal line). The engaged state of CL1 is shown respectively. Further, the white diamond mark (◇) in the brake BR1 that selectively connects the first ring gear R1 to the case 18 indicates the released state of the brake BR1, and the black diamond mark (◆) indicates the engaged state of the brake BR1. .. Further, the white diamond mark (◇) in the clutch CLc that selectively connects the first ring gear R1 and the second carrier C2 indicates the released state of the clutch CLc, and the black diamond mark (◆) indicates the engaged state of the clutch CLc. Shown. The straight line representing the rotational speed of the first differential mechanism 38 is shown by a broken line, and the straight line representing the rotational speed of the second differential mechanism 40 is shown by a solid line. The arrow in the black circle (●) is driven by the power generated by the first rotary machine MG1 by the power of the engine 12 divided into the first rotary machine MG1 and / or the power supplied from the battery unit 52. It is the MG2 torque Tm by the second rotary machine MG2, and does not include the direct torque of the engine. Further, the black diamond mark (◆) in the clutch CLc overlaps with the black circle mark (●), so that it is not shown in the figure. The distance between the vertical lines Y1, Y2, Y3, and Y4 is determined according to the gear ratios ρ1 and ρ2 of the differential mechanisms 38 and 40. When the distance between the sun gear and the carrier is set to correspond to "1" in the relationship between the vertical axes of the co-line diagram, the gear ratio ρ of the planetary gear mechanism is between the carrier and the ring gear (= number of teeth of the sun gear / ring gear). The interval corresponds to the number of teeth).

4 and 5 are collinear diagrams in the single drive EV mode. The independent drive EV mode is realized in a state where the clutch CL1, the brake BR1, and the clutch CLc are all released, as shown in the “normal” of FIG. In the single drive EV mode, the clutch CL1 and the brake BR1 are released, the differential of the first differential mechanism 38 is allowed, and the first differential mechanism 38 is set to the neutral state. The hybrid control unit 92 stops the operation of the engine 12 and outputs the MG2 torque Tm for traveling from the second rotary machine MG2. FIG. 4 shows a case where the second rotary machine MG2 is rotating forward (that is, the rotation direction of the second carrier C2 when the vehicle 10 is moving forward) and is outputting a positive torque. Further, FIG. 5 shows a case in which the second rotary machine MG2 outputs a negative torque in a negative rotation (that is, a rotation direction of the second carrier C2 in the reverse rotation of the vehicle 10) when the vehicle is in reverse rotation. While the vehicle is running, the second carrier C2 connected to the output shaft 24 is rotated in conjunction with the rotation of the second rotary machine MG2 (here, the rotation of the drive wheels 16 is also agreed). In the single drive EV mode, since the clutch CLc is further released, the engine 12 and the first rotary machine MG1 are not rotated, respectively, and the engine rotation speed Ne and the MG1 rotation speed Ng can be set to zero. As a result, it is possible to reduce the drag loss of each of the engine 12 and the first rotary machine MG1 and improve the electric energy (that is, suppress the power consumption). The hybrid control unit 92 maintains the MG1 rotation speed Ng at zero by feedback control. Alternatively, the hybrid control unit 92 executes control (d-axis lock control) to pass a current through the first rotary machine MG1 so that the rotation of the first rotary machine MG1 is fixed, and maintains the MG1 rotation speed Ng at zero. do. Alternatively, even if the MG1 torque Tg is set to zero, it is not necessary to add the MG1 torque Tg when the MG1 rotation speed Ng can be maintained at zero by the cogging torque of the first rotating machine MG1. Even if the control for maintaining the MG1 rotation speed Ng at zero is performed, the first power transmission unit 20 is in a neutral state in which the reaction force of the MG1 torque Tg cannot be taken, so that the drive torque is not affected. Alternatively, in the single drive EV mode, the first rotary machine MG1 may be idled with no load.

6 and 7 are collinear diagrams in the dual drive EV mode. The dual drive EV mode is realized in a state where the clutch CL1 and the brake BR1 are engaged and the clutch CLc is released, as shown in "both drives" in FIG. In the dual drive EV mode, the clutch CL1 and the brake BR1 are engaged, the differential of the first differential mechanism 38 is regulated, and the rotation of the first ring gear R1 is stopped. Therefore, the rotation of any rotating element of the first differential mechanism 38 is stopped, and the first differential mechanism 38 is set to the internal locked state. As a result, the engine 12 is stopped at zero rotation, and the second ring gear R2 connected to the first sun gear S1 is also fixed at zero rotation. When the second ring gear R2 is fixed so as not to rotate, the reaction torque of MG1 torque Tg can be obtained by the second ring gear R2, so that the torque based on MG1 torque Tg is mechanically output from the second carrier C2 to drive the drive wheels. It can be transmitted to 16. The hybrid control unit 92 stops the operation of the engine 12 and outputs MG1 torque Tg and MG2 torque Tm for traveling from the first rotating machine MG1 and the second rotating machine MG2, respectively. FIG. 6 shows a case in which the first rotary machine MG1 and the second rotary machine MG2 are both in the forward rotation and output positive torque in the forward rotation. Further, FIG. 7 shows a case in which the first rotary machine MG1 and the second rotary machine MG2 are both in reverse rotation and output negative torque in negative rotation.

As shown in the description using FIGS. 4 to 7, in the single drive EV mode, the vehicle 10 is driven only by the second rotary machine MG2, and in the double drive EV mode, the first rotary machine MG1 and the second rotary machine MG2 are used. It is possible to drive the vehicle 10. Therefore, in the case of motor traveling, when the load is low, the independent drive EV mode is established and the second rotary machine MG2 is used for independent travel, and when the load is high, the double drive EV mode is established and the first rotary machine is established. Both are driven by MG1 and the second rotary machine MG2. Regeneration during vehicle deceleration, including engine running, is mainly executed by the second rotary machine MG2.

When regenerative control is performed by the second rotary machine MG2 while traveling in the single drive EV mode, the engine 12 whose operation has been stopped is not rotated and is stopped at zero rotation, so a large amount of regeneration should be taken. Can be done. On the other hand, if the battery unit 52 is in a fully charged state during traveling in the independent drive EV mode, regenerative energy cannot be obtained, so that braking torque cannot be obtained by the regenerative brake. When running in the single drive EV mode, if the battery unit 52 is in a fully charged state and regenerative energy cannot be obtained, braking torque is obtained with the engine brake, or if the battery unit 52 is nearly fully charged, the engine brake is also used. It is conceivable to do. From another point of view, if the battery capacity SOC decreases during traveling in the single drive EV mode and it becomes difficult to secure the electric power to be supplied to the second rotary machine MG2, the second rotary machine MG2 cannot be driven. If the battery capacity SOC drops during driving in the single drive EV mode, it is conceivable to switch to engine driving. From the above, the EV driving mode has a standby mode in which the engine brake is applied promptly or a preparation for promptly switching to the engine driving is provided, and an emblem combined mode in which the engine brake is used in combination. ..

8 and 9 are collinear diagrams in the standby mode in the EV traveling mode, respectively. This standby mode is realized in a state where the clutch CL1 or the clutch CLc is engaged, as shown in the “standby mode” of FIG. When the clutch CL1 or the clutch CLc is engaged, the engine 12 can be put into a rotating state, but in this standby mode, the first rotary machine MG1 is idled with no load, so that the engine 12 in the stopped operation is zero. It is stopped by rotation. Therefore, in this standby mode, the motor running or regeneration control can be performed by the second rotary machine MG2 without applying the engine brake. From the standby mode, the engine rotation speed Ne is raised by the first rotary machine MG1 and the reaction force of the engine torque Te (negative value) is taken by the first rotary machine MG1. The brake can be applied. Further, from the state of the standby mode, the engine rotation speed Ne can be increased and ignited by the first rotary machine MG1, so that the engine running can be started.

The operating state of each engaging element (clutch CL1, brake BR1, clutch CLc) in the standby mode in which the clutch CL1 is engaged as shown in FIG. 8 is the forward traveling in the U / DHV mode of the HV traveling mode described later. It is the same as the operating state of each engaging element. Although the engine 12 is not operated in the standby mode, for convenience, the standby mode in which the clutch CL1 is engaged is referred to as a standby mode in the U / D input split.

The operating state of each engaging element in the standby mode in which the clutch CLc is engaged as shown in FIG. 9 is the same as the operating state of each engaging element in the forward traveling in the O / DHV mode of the HV traveling mode described later. Is. For convenience, the standby mode in which the clutch CLc is engaged is referred to as a standby mode in the O / D input split.

10 and 11 are collinear diagrams in the EV traveling mode in the emblem combined mode, respectively. This engine braking combined mode is realized in a state where the clutch CL1 or the clutch CLc is engaged, as shown in the "engine braking combined use" of FIG. When the clutch CL1 or the clutch CLc is engaged, the engine 12 is brought into a rotating state. Therefore, in this emblem combined mode, the engine torque Te (negative value) is controlled by the first rotary machine MG1 while controlling the engine rotation speed Ne. By taking the reaction force of, the engine brake can be applied according to the engine rotation speed Ne. Therefore, in this emblem combined mode, the engine brake can be applied in addition to or in place of the regenerative brake by the second rotary machine MG2. The engine brake can also be applied by engaging the clutch CL1 and the clutch CLc. In this case, it is not necessary to take the reaction force of the engine torque Te (negative value) in the first rotary machine MG1. The operating state of each engaging element (clutch CL1, brake BR1, clutch CLc) in the emblem combined mode in which the clutch CL1 and the clutch CLc are engaged is the operating state of each engaging element in the direct connection fixed stage mode of the HV traveling mode described later. It is in the same state as the operating state.

The operating state of each engaging element (clutch CL1, brake BR1, clutch CLc) in the emblem combined mode in which the clutch CL1 is engaged as shown in FIG. 10 is the forward traveling in the U / DHV mode of the HV traveling mode described later. It is the same state as the operating state of each engaging element in. Although the engine 12 is not operated in the emblem combined mode, the emblem combined mode in which the clutch CL1 is engaged is referred to as an emblem combined mode in the U / D input split for convenience.

The operating state of each engaging element in the emblem combined mode in which the clutch CLc is engaged as shown in FIG. 11 is the same as the operating state of each engaging element in the forward traveling in the O / DHV mode of the HV traveling mode described later. It is in a state. For convenience, the emblem combined mode in which the clutch CLc is engaged is referred to as an emblem combined mode in the O / D input split.

FIG. 12 is a collinear diagram in forward traveling in the U / DHV mode of the HV traveling mode. In the forward running in the U / DHV mode (hereinafter referred to as the U / DHV mode (forward)), as shown in the "forward" of the "U / D input split" in FIG. 3, the clutch CL1 is engaged and the brake is applied. It is realized in the state where BR1 and the clutch CLc are released. In the U / DHV mode (forward), the clutch CL1 is engaged and the brake BR1 is released, and the first differential mechanism 38 is in a directly connected state. Therefore, the power of the engine 12 input to the first carrier C1 Is directly transmitted to the second ring gear R2 connected to the first sun gear S1. In addition, in the U / DHV mode (forward), the clutch CLc is released, and the second differential mechanism 40 alone constitutes an electric continuously variable transmission. As a result, the first power transmission unit 20 can divide the power of the engine 12 input to the second ring gear R2 into the second sun gear S2 and the second carrier C2. That is, in the first power transmission unit 20, the direct torque of the engine is mechanically transmitted to the second carrier C2 by taking the reaction force of the engine torque Te input to the second ring gear R2 by the first rotary machine MG1. At the same time, the generated power of the first rotating machine MG1 by the power of the engine 12 divided into the first rotating machine MG1 is transmitted to the second rotating machine MG2 via a predetermined electric path. The hybrid control unit 92 drives (starts) the engine 12, outputs MG1 torque Tg which is a reaction torque with respect to the engine torque Te by the power generation of the first rotary machine MG1, and uses the generated power of the first rotary machine MG1 to output the MG1 torque Tg. The MG2 torque Tm is output from the two-turn machine MG2. The hybrid control unit 92 can also drive the second rotary machine MG2 by adding the power supplied from the battery unit 52 to the generated power of the first rotary machine MG1. FIG. 12 shows a case where the second rotary machine MG2 is traveling forward by outputting a positive torque in the forward rotation. The U / DHV mode (advance) engages either one of the clutch CL1 which is the first engaging element and the clutch CLc which is the second engaging element, that is, the clutch CL1 which is the first engaging element. This is an HV driving mode in which the engine 12 is driven together.

FIG. 13 is a collinear diagram in forward traveling in the O / DHV mode of the HV traveling mode. The forward running in the O / DHV mode (hereinafter referred to as the O / DHV mode (forward)) is a state in which the clutch CL1 and the brake BR1 are released, as shown in the “forward” of the “O / D input split” in FIG. Moreover, it is realized in a state where the clutch CLc is engaged. In the O / DHV mode (forward), the clutch CLc is engaged, and the first differential mechanism 38 and the second differential mechanism 40 form one differential mechanism. In addition, in the O / DHV mode (forward), the clutch CL1 and the brake BR1 are released, and the first differential mechanism 38 and the second differential mechanism 40 as a whole are combined with the second differential mechanism 40 alone. An electric continuously variable transmission that operates at a power division ratio different from that of the above is configured. As a result, the first power transmission unit 20 can divide the power of the engine 12 input to the first carrier C1 into the second sun gear S2 and the second carrier C2. That is, in the first power transmission unit 20, the direct torque of the engine is mechanically transmitted to the second carrier C2 by taking the reaction force of the engine torque Te input to the first carrier C1 by the first rotary machine MG1. At the same time, the generated power of the first rotating machine MG1 by the power of the engine 12 divided into the first rotating machine MG1 is transmitted to the second rotating machine MG2 via a predetermined electric path. The hybrid control unit 92 drives (starts) the engine 12, outputs MG1 torque Tg which is a reaction torque with respect to the engine torque Te by the power generation of the first rotary machine MG1, and uses the generated power of the first rotary machine MG1 to output the MG1 torque Tg. The MG2 torque Tm is output from the two-turn machine MG2. FIG. 13 shows a case where the second rotary machine MG2 is moving forward while outputting a positive torque in the forward rotation. The O / DHV mode (advance) engages the clutch CL1 which is the first engaging element or the clutch CLc which is the second engaging element, whichever is the other engaging element, that is, the clutch CLc which is the second engaging element. This is an HV driving mode in which the engine 12 is driven together.

FIG. 14 is a collinear diagram of the reverse running in the U / DHV mode of the HV running mode, and the rotation and torque of the engine 12 with respect to the configuration achieving the function as an electric continuously variable transmission. Is input in reverse to a negative value, which is the case of engine reverse input. The reverse running with the U / DHV mode engine reverse input (hereinafter referred to as U / DHV mode reverse input (reverse)) is shown in the "engine reverse input" of the "reverse" of the "U / D input split" of FIG. As described above, the brake BR1 is engaged and the clutch CL1 and the clutch CLc are released. At the U / DHV mode reverse input (reverse), the clutch CL1 is released and the brake BR1 is engaged, and the first differential mechanism 38 is in the reverse rotation speed change state of the engine 12, so that the first carrier C1 is engaged. The input power of the engine 12 is transmitted to the second ring gear R2 connected to the first sun gear S1 by negative rotation and negative torque. In addition, at the U / DHV mode reverse input (reverse), the clutch CLc is released, and the second differential mechanism 40 alone constitutes an electric continuously variable transmission. As a result, the first power transmission unit 20 can divide the power of the engine 12 input to the second ring gear R2 in reverse to the second sun gear S2 and the second carrier C2. The hybrid control unit 92 drives (starts) the engine 12, outputs MG1 torque Tg which is a reaction torque with respect to the engine torque Te by the power running of the first rotary machine MG1, and uses the power supplied from the battery unit 52 to output the MG1 torque Tg. The MG2 torque Tm is output from the two-turn machine MG2. FIG. 14 shows a case where the second rotary machine MG2 outputs a negative torque in a negative rotation and travels backward. Further, in the U / DHV mode reverse input (reverse), the power of the engine 12 is transmitted to the second ring gear R2 by negative rotation and negative torque, so that the drive torque for reverse travel is output together with the MG2 torque Tm. Can be done. The second rotary machine MG2 may output a positive torque in a negative rotation in order to generate electric power used for power running of the first rotary machine MG1. Even in this case, the engine direct torque which is a negative torque is higher. Since the absolute value is larger than the MG2 torque Tm, reverse running is possible.

FIG. 15 is a collinear diagram in the reverse traveling in the U / DHV mode of the HV traveling mode, and is the case of the engine forward rotation input. The reverse running with the U / DHV mode engine forward rotation input (hereinafter referred to as the U / DHV mode normal rotation input (reverse)) is the "engine forward rotation input" of the "backward" of the "U / D input split" in FIG. As shown in the above, the clutch CL1 is engaged and the brake BR1 and the clutch CLc are released. In the U / DHV mode forward rotation input (reverse), the clutch CL1 is engaged and the brake BR1 is released, and the first differential mechanism 38 is in a directly connected state. Therefore, the engine input to the first carrier C1 The power of 12 is directly transmitted to the second ring gear R2 connected to the first sun gear S1. In addition, in the U / DHV mode forward rotation input (reverse), the clutch CLc is released, and the second differential mechanism 40 alone constitutes an electric continuously variable transmission. As a result, the first power transmission unit 20 can divide the power of the engine 12 input to the second ring gear R2 into the second sun gear S2 and the second carrier C2. The hybrid control unit 92 drives (drives) the engine 12 and outputs MG1 torque Tg, which is a reaction torque with respect to the engine torque Te, by the power generation of the first rotary machine MG1. The MG2 torque Tm is output from the two-turn machine MG2. FIG. 15 shows a case where the second rotary machine MG2 outputs a negative torque in a negative rotation and travels backward. Although the direct engine torque is positive torque, it is driven by the generated power of the first rotating machine MG1 (or is driven by adding the power supplied from the battery unit 52 to the generated power of the first rotating machine MG1. Since the output torque (negative value (negative torque)) of the second rotary machine MG2 has an absolute value larger than the engine direct torque, it is possible to drive backward.

FIG. 16 is a collinear diagram in the reverse traveling in the O / DHV mode of the HV traveling mode, and is the case of the engine forward rotation input. The reverse running with the engine forward rotation input in the O / DHV mode (hereinafter referred to as the O / DHV mode forward rotation input (reverse)) is the "engine forward rotation input" of the "reverse" of the "O / D input split" in FIG. As shown in the above, the clutch CL1 and the brake BR1 are released, and the clutch CLc is engaged. In the O / DHV mode forward rotation input (reverse), the clutch CLc is engaged, and the first differential mechanism 38 and the second differential mechanism 40 form one differential mechanism. In addition, in the O / DHV mode forward rotation input (reverse), the clutch CL1 and the brake BR1 are released, and the first differential mechanism 38 and the second differential mechanism 40 as a whole are combined with the second differential mechanism. An electric continuously variable transmission that operates at a power division ratio different from the power division ratio of the 40 alone is configured. As a result, the first power transmission unit 20 can divide the power of the engine 12 input to the first carrier C1 into the second sun gear S2 and the second carrier C2. The hybrid control unit 92 drives (starts) the engine 12, outputs MG1 torque Tg which is a reaction torque with respect to the engine torque Te by the power generation of the first rotary machine MG1, and uses the generated power of the first rotary machine MG1 to output the MG1 torque Tg. The MG2 torque Tm is output from the two-turn machine MG2. FIG. 16 shows a case where the second rotary machine MG2 outputs a negative torque in a negative rotation and travels backward. Although the direct torque of the engine is a positive torque, it is possible to drive in the reverse direction as in the case of the U / DHV mode forward rotation input (reverse).

As shown in the description using FIGS. 12-16, in the U / DHV mode and the O / DHV mode, the power of the engine 12 is relative to the configuration that achieves the function as an electric continuously variable transmission. The rotating elements to which are input are different, and the power division ratio when the first power transmission unit 20 functions as an electric continuously variable transmission is different. That is, the ratio of each output torque and each rotation speed of the rotary machines MG1 and MG2 to the engine 12 can be changed between the O / DHV mode and the U / DHV mode. The operating state of the clutch CLc is switched in order to change the ratio of each output torque and each rotation speed of the rotating machines MG1 and MG2 to the engine 12 while the engine is running.

The MG1 rotation speed Ng is set to zero, and the power of the engine 12 is all machine without passing through an electric path (an electric power transmission path which is an electric path related to power transfer of the first rotating machine MG1 and the second rotating machine MG2). In the U / DHV mode, there is a case where the rotation of the engine 12 is decelerated and the underdrive state is output from the second carrier C2 in the state of the so-called mechanical point where the electric power is transmitted to the second carrier C2. The O / DHV mode is a case where the rotation speed of the engine 12 is accelerated and an overdrive state is output from the second carrier C2. The engine direct torque in the U / DHV mode is increased with respect to the engine torque Te. On the other hand, the direct engine torque in the O / DHV mode is reduced with respect to the engine torque Te.

FIG. 17 is a collinear diagram in the fixed stage mode of the HV traveling mode, and is a case of direct connection in which the rotating elements of the first differential mechanism 38 and the second differential mechanism 40 are integrally rotated. The direct connection of the fixed stage mode (hereinafter referred to as the direct connection fixed stage mode) is a state in which the clutch CL1 and the clutch CLc are engaged and the brake BR1 is as shown in "Direct connection" of "Advance" of "Fixed stage" in FIG. Is realized in the released state. In the direct connection fixed stage mode, the clutch CL1 is engaged and the brake BR1 is released, and the first differential mechanism 38 is in the direct connection state. In addition, in the direct connection fixed stage mode, the clutch CLc is engaged, and each rotating element of the first differential mechanism 38 and the second differential mechanism 40 is integrally rotated. As a result, the first power transmission unit 20 can directly output the power of the engine 12 from the second carrier C2. The hybrid control unit 92 outputs the running engine torque Te from the engine 12. In this direct connection fixed stage mode, the power of the first rotating machine MG1 can be driven by the electric power from the battery unit 52, and the power of the first rotating machine MG1 can be directly output from the second carrier C2. Further, in this direct connection fixed stage mode, the second rotary machine MG2 can be driven by the electric power from the battery unit 52, and the power of the second rotary machine MG2 can be transmitted to the drive wheels 16. Therefore, in addition to outputting the engine torque Te, the hybrid control unit 92 may output the running torque from at least one of the first rotating machine MG1 and the second rotating machine MG2. That is, in the direct connection fixed stage mode, the vehicle 10 may be driven only by the engine 12, or torque assist may be performed by the first rotary machine MG1 and / or the second rotary machine MG2.

FIG. 18 is a collinear diagram in the fixed stage mode of the HV traveling mode, and is a case where the second carrier C2 is fixed so as not to rotate, and the output shaft is fixed. The fixed output shaft mode (hereinafter referred to as the fixed output shaft mode) engages the brake BR1 and the clutch CLc as shown in "Fixed output shaft" of "Advance" of "Fixed stage" in FIG. It is realized in a state and a state in which the clutch CL1 is released. In the output shaft fixed stage mode, the clutch CLc is engaged, and the first differential mechanism 38 and the second differential mechanism 40 form one differential mechanism. In addition, in the output shaft fixed stage mode, the brake BR1 is engaged and the clutch CL1 is released, so that the second carrier C2 is fixed so as not to rotate. As a result, in the first power transmission unit 20, the reaction force of the power of the engine 12 input to the first carrier C1 can be taken by the first rotary machine MG1. Therefore, in the output shaft fixed stage mode, the battery unit 52 can be charged with the power generated by the first rotary machine MG1 powered by the engine 12. The hybrid control unit 92 drives (starts) the engine 12, takes a reaction force against the power of the engine 12 by the power generation of the first rotary machine MG1, and transmits the generated power of the first rotary machine MG1 via the power control unit 50. The battery unit 52 is charged. In this output shaft fixed stage mode, since the second carrier C2 is fixed so as not to rotate, the battery unit 52 is exclusively charged when the vehicle 10 is stopped. As shown in the description using FIGS. 17 and 18, the clutch CLc is engaged in the direct connection fixed stage mode and the output shaft fixed stage mode of the HV traveling mode.

In the region where the reduction ratio I (= Ne / No) of the first power transmission unit 20 is relatively large, the output ratio of MG1 power Pg to engine power Pe (Pg / Pe) and the output ratio of MG2 power Pm to engine power Pe. Each absolute value of (Pm / Pe) is made smaller in the U / DHV mode than in the O / DHV mode. Therefore, in the region where the reduction ratio I is relatively large, the increase in the MG1 power Pg and the increase in the MG2 power Pm can be suppressed by establishing the U / DHV mode. On the other hand, in a relatively small region where the reduction ratio I is smaller than "1", the output ratio (Pm / Pe) becomes a negative value (that is, the output ratio (Pg / Pe) becomes a positive value), and the output ratio ( The absolute values of Pg / Pe) and output ratio (Pm / Pe) are made larger in the U / DHV mode than in the O / DHV mode. In the state where the output ratio (Pm / Pe) is a negative value (that is, the state where the output ratio (Pg / Pe) is a positive value), the second rotary machine MG2 generates power, and the generated power is transferred to the first rotary machine MG1. It is a power circulation state to be supplied. It is desirable to avoid or suppress this power circulation state as much as possible. Therefore, in the region where the reduction ratio I is relatively small, the power circulation power can be reduced by establishing the O / DHV mode. By switching between the U / DHV mode and the O / DHV mode according to the reduction ratio I, the engine power can be transmitted by the rotary machines MG1 and MG2 having lower output (low power).

That is, the U / DHV mode is established when the load of the engine 12 using the relatively large reduction ratio I is high, and the O / DHV mode is established when the load of the engine 12 using the relatively small reduction ratio I is low or the vehicle speed is high. In addition, by properly using the U / DHV mode and the O / DHV mode, an increase in each torque and each rotation speed of the rotary machines MG1 and MG2 is prevented or suppressed, and the power circulation power is reduced at a high vehicle speed. This reduces the energy conversion loss in the electric path and leads to improvement in fuel efficiency. Alternatively, it leads to miniaturization of the rotating machines MG1 and MG2.

19 and 20 are diagrams showing an example of a traveling mode switching map used for switching control between engine traveling and motor traveling, respectively. Each of these travel mode switching maps is a preliminary experiment having a boundary line between the engine travel region and the motor travel region with the vehicle speed V and the travel load of the vehicle 10 (hereinafter referred to as vehicle load) (for example, required drive torque) as variables. It is a relationship that is sought and memorized (that is, predetermined) in terms of design or design.

FIG. 19 shows a state transition (that is, switching of the traveling mode of the vehicle 10) of the power transmission device 14 in CS (Charge Sustain) traveling while maintaining the battery capacity SOC. FIG. 19 is used when the vehicle 10 is, for example, a hybrid vehicle in which the battery capacity SOC is originally set to be relatively small. Alternatively, FIG. 19 is used when the mode in which the vehicle 10 holds the battery capacity SOC is established in, for example, a plug-in hybrid vehicle, a range extended vehicle, or the like in which a relatively large battery capacity SOC is originally set. On the other hand, FIG. 20 shows a state transition (that is, switching of a traveling mode of the vehicle 10) of the power transmission device 14 in a CD (Charge Depleting) traveling traveling while consuming the battery capacity SOC. FIG. 20 is used when the vehicle 10 is in a mode of consuming the battery capacity SOC in, for example, a plug-in hybrid vehicle or a range extended vehicle in which a relatively large battery capacity SOC is originally set. When the vehicle 10 is, for example, a hybrid vehicle in which the battery capacity SOC is originally set to be relatively small, it is preferable not to use FIG. 20.

In FIG. 19, the region of each traveling mode according to the traveling state such as the vehicle speed V and the vehicle load so that the U / DHV mode is easily established when the load is high and the O / DHV mode is easily established when the load is low or the vehicle speed is high. Is set. A direct connection fixed stage mode region is set between the U / DHV mode region and the O / DHV mode region. Further, when the power of the battery unit 52 can be taken out (or when the warm-up of each device by the warm-up of the engine 12 or the operation of the engine 12 is completed), in the region where the operating efficiency of the engine 12 deteriorates. Power running of the second rotating machine MG2 is performed in the motor running. Therefore, the region of the independent drive EV mode is set in the region where the vehicle speed is low and the load is low as shown by the broken line. When the vehicle load is negative, deceleration running is performed in the U / DHV mode or the O / DHV mode by applying the engine brake using the negative torque of the engine 12. When the power of the battery unit 52 can be received, the regenerative control is performed by the second rotating machine MG2 in the motor running. Therefore, the region of the independent drive EV mode is set in the region where the vehicle load is negative as shown by the alternate long and short dash line. In the running mode switching map in CS running set in this way, for example, when starting, the U / DHV mode is established for both forward and backward running. As a result, the engine power Pe can be used more effectively, and the starting acceleration performance is improved. As the vehicle speed V increases in the forward traveling, the reduction ratio I of the first power transmission unit 20 becomes close to "1". In this state, the mode can be shifted to the direct connection fixed stage mode. In low vehicle speed running, the engine rotation speed Ne becomes extremely low, so the U / DHV mode is directly shifted to the O / DHV mode. In the direct connection fixed stage mode, since there is no power transmission via the rotary machines MG1 and MG2, there is no heat loss due to conversion between mechanical energy and electrical energy. Therefore, it is advantageous for improving fuel efficiency and avoiding heat generation. Therefore, when the load is high such as towing or the vehicle speed is high, the direct connection fixed stage mode may be positively shifted. When the switch for selecting the motor running is operated by the driver and the motor running is selected, the independent drive EV mode is established in the region shown by the broken line.

In FIG. 20, each driving mode according to the traveling state such as the vehicle speed V and the vehicle load is established so that the single drive EV mode is established in the region where the vehicle load is low and the dual drive EV mode is established in the region where the vehicle load is high. Area is set. In the dual drive EV mode, based on the operating efficiency of the first rotating machine MG1 and the second rotating machine MG2 (for example, for the purpose of improving the electric cost, lowering the temperature of the rotating machines MG1 and MG2, lowering the temperature of the power control unit 50, etc.). The power sharing ratio between the first rotating machine MG1 and the second rotating machine MG2 is determined. Further, depending on the maximum output of the battery unit 52 or the maximum outputs of the rotary machines MG1 and MG2, or due to an increase in the vehicle speed V when the motor is running, an increase in the rotational speed of any of the rotating elements of the power transmission device 14 causes the engine 12. When it is alleviated by driving, as shown in FIG. 20, the HV driving mode region is set in the high load region and the high vehicle speed region, and the engine 12 is used as the power source for traveling. You may move to. In FIG. 20, in the region of the HV traveling mode, the region of the direct connection fixed stage mode is set between the region of the U / DHV mode and the region of the O / DHV mode. Further, in the region where the vehicle load is negative, the region of the independent drive EV mode is set so that the regeneration control by the second rotary machine MG2 is performed in the motor running. In the running mode switching map in CD running set in this way, for example, when the vehicle speed V rises, the rotating speed of each element such as the rotating machines MG1 and MG2 and the differential mechanisms 38 and 40 increases, so that in CS running. The rotation speed of each element is controlled to be within the limit by shifting to the HV driving mode as set in the traveling mode switching map of. In the single drive EV mode, the first rotary machine MG1 and the engine 12 are separated (that is, the power transmission between the first rotary machine MG1 and the engine 12 is cut off), so that the single drive EV mode is high. The area on the vehicle speed side may be expanded to the higher vehicle speed side than the dual drive EV mode. The regenerative control in the region where the vehicle load is negative may be changed to the dual drive EV mode instead of the single drive EV mode. Further, the drive torque and the vehicle speed V may be set to an upper limit so that the engine 12 does not start and fuel is not consumed.

The hybrid control unit 92 applies the vehicle speed V and the vehicle load (for example, the required drive torque) to the travel mode switching map as shown in FIG. 19 or FIG. to decide. The hybrid control unit 92 establishes the current driving mode as it is when the determined driving mode is the current driving mode, and when the determined driving mode is different from the current driving mode, the current driving mode is present. Instead of the driving mode, the determined driving mode is established.

When the independently driven EV mode is established, the hybrid control unit 92 enables motor traveling using only the second rotary machine MG2 as a power source for traveling. When the dual drive EV mode is established, the hybrid control unit 92 enables motor traveling using both the first rotating machine MG1 and the second rotating machine MG2 as power sources for traveling.

When the U / DHV mode or the O / DHV mode is established, the hybrid control unit 92 takes charge of the reaction force with respect to the power of the engine 12 by the power generation of the first rotary machine MG1, so that the engine direct torque reaches the second carrier C2. By driving the second rotary machine MG2 with the generated power of the first rotary machine MG1, torque is transmitted to the drive wheels 16 to enable the engine to run. In the U / DHV mode or the O / DHV mode, the hybrid control unit 92 has an engine operating point in consideration of the optimum fuel line of the known engine 12 (that is, an engine operating point represented by an engine rotation speed Ne and an engine torque Te). The engine 12 is driven by. In this U / DHV mode or O / DHV mode, it is also possible to drive the second rotary machine MG2 by adding the power from the battery unit 52 to the generated power of the first rotary machine MG1.

When the direct connection fixed stage mode is established, the hybrid control unit 92 enables the engine to run by directly outputting the power of the engine 12 from the second carrier C2. In the direct connection fixed stage mode, the hybrid control unit 92 drives the first rotary machine MG1 with the electric power from the battery unit 52 in addition to the power of the engine 12, and directly transfers the power of the first rotary machine MG1. It is also possible to output from the two carrier C2 or drive the second rotary machine MG2 with the electric power from the battery unit 52 and transmit the power of the second rotary machine MG2 to the drive wheels 16 to travel.

When the vehicle is stopped, the hybrid control unit 92 establishes the output shaft fixed stage mode when the battery capacity SOC is equal to or less than a predetermined predetermined capacity at which it is determined that the battery unit 52 needs to be charged. When the output shaft fixed stage mode is established, the hybrid control unit 92 takes charge of the reaction force with respect to the power of the engine 12 by the power generation of the first rotary machine MG1, and the power control unit 50 receives the generated power of the first rotary machine MG1. The battery unit 52 is charged via the above.

In both the U / DHV mode and the O / DHV mode, the first power transmission unit 20 is made to function as an electric continuously variable transmission. Further, the state in which the reduction ratio I of the first power transmission unit 20 is "1" is the same as the state in the direct connection fixed stage mode in which the clutch CL1 and the clutch CLc are both engaged (see FIG. 17). Therefore, the hybrid control unit 92 switches between the U / DHV mode in which the clutch CL1 is engaged and the O / DHV mode in which the clutch CLc is engaged when the reduction ratio I is in the synchronized state of “1”. It is executed by switching each operating state of the clutch CL1 and the clutch CLc (via a state equivalent to the direct connection fixed stage mode). Alternatively, the hybrid control unit 92 switches between the U / DHV mode in which the clutch CL1 is engaged and the O / DHV mode in which the clutch CLc is engaged, so-called switching between the clutch CL1 and the clutch CLc. It may be executed by the shift control of the clutch to clutch.

In the single drive EV mode, the engine 12 is brought into a rotating state by engaging the clutch CL1 or the clutch CLc. Therefore, when the engine 12 is started while the motor is running in the single drive EV mode, the hybrid control unit 92 engages the clutch CL1 or the clutch CLc, raises the engine rotation speed Ne, and ignites the engine 12. At this time, the hybrid control unit 92 may increase the engine rotation speed Ne by the first rotary machine MG1 if necessary.

Alternatively, when the engine 12 is started while the motor is running in the independent drive EV mode, the hybrid control unit 92 engages the clutch CL1 or the clutch CLc with the engine rotation speed Ne at zero [rpm]. After synchronously controlling the rotation speed of each element of the differential mechanisms 38 and 40 with the first rotary machine MG1 so as to be in the same state, the clutch CL1 is engaged or the clutch CL1 is engaged or in the same state as the clutch CL1 is engaged. In the same state as when the clutch CLc is engaged, the clutch CLc is engaged, and the first rotary machine MG1 raises the engine rotation speed Ne and ignites. That is, when the hybrid control unit 92 starts the engine 12 while the motor is running in the independent drive EV mode, the engaging element (clutch CL1 or clutch CLc) for establishing the standby mode is still released. Is synchronously controlled by the first rotary machine MG1 so that the rotation speed of each element of the differential mechanisms 38 and 40 is in the same state as the standby mode, and then the engaging elements for establishing the standby mode are engaged. Then, the standby mode is once established, and from the state of the standby mode, the engine rotation speed Ne is raised by the first rotary machine MG1 and ignited. In this way, when the engine 12 is started while the motor is running in the single drive EV mode, the engine running may be started via the standby mode. In this case, it suffices if the standby mode (U / D input split or O / D input split) to be passed through is established in accordance with the running mode (U / DHV mode or O / DHV mode) when the engine is running.

When the engine 12 is started, the second carrier C2 connected to the drive wheels 16 receives the negative force of the engine 12 due to the increase in the rotation of the engine 12 when the operation is stopped as a reaction force for increasing the engine rotation speed Ne. Since the torque (also called the engine pull-in torque) is transmitted, the drive torque drops. When the hybrid control unit 92 starts the engine 12 while the motor is running in the single drive EV mode, the hybrid control unit 92 compensates for a drop in the drive torque (also referred to as a reaction force cancel torque) in order to suppress a shock at the time of starting the engine. Is additionally output by the second rotary machine MG2.

In the dual drive EV mode in which the clutch CL1 and the brake BR1 are engaged, the engine 12 is brought into a rotating state by releasing the brake BR1. Therefore, when the engine 12 is started while the motor is running in the dual drive EV mode, the hybrid control unit 92 engages the clutch CLc after releasing the brake BR1 to raise the engine rotation speed Ne and ignite. At this time, the hybrid control unit 92 may increase the engine rotation speed Ne by the first rotary machine MG1 if necessary. Alternatively, when the engine 12 is started while the motor is running in the dual drive EV mode, the hybrid control unit 92 releases the brake BR1 and raises the engine rotation speed Ne by the first rotary machine MG1 to ignite. Alternatively, in the dual drive EV mode, the clutch CL1 and the brake BR1 are released to achieve the same state as the independent drive EV mode. Therefore, the clutch CL1 and the brake BR1 are released to release the engine in the single drive EV mode described above. It is also possible to start. When the engine 12 is started while the motor is running in the dual drive EV mode, the hybrid control unit 92 additionally outputs the reaction force canceling torque by the second rotary machine MG2.

Here, from the single rotating machine running in which the clutch CL1 which is the first engaging element and the clutch CLc which is the second engaging element are released and the second rotating machine MG2 is driven independently, the clutch CL1 or the clutch CLc A case where one of the clutches is engaged to start the engine 12 will be examined. In this embodiment, for example, when the amount of heat QL generated by the clutch CL1 is predicted to be equal to or higher than the predetermined value QL1 when the clutch CL1 is engaged and the engine 12 is started while the single rotating machine is running. Instead of the clutch CL1, the clutch CHc is engaged to start the engine 12. In addition, in order to start the engine 12 by engaging the clutch of either the clutch CL1 or the clutch CLc from the traveling of the single rotary machine, the electronic control device 90 is further provided with an engine starting means, that is, an engine starting unit 96. It is equipped.

The engine starting unit 96 releases the clutch CL1 and the clutch CLc, respectively, and determines whether or not there is an engine start request during the running of the single rotating machine, which runs by the independent drive of the second rotating machine MG2. For example, in the engine starting unit 96, the single drive EV mode is established by the hybrid control unit 92, and the charge capacity SOC of the battery unit 52 is equal to or less than a predetermined value A (see FIG. 22) by the independent drive of the second rotary machine MG2. If it is determined to be present, it is determined that the engine start request has been made while the single rotary machine is running.

When the hybrid control unit 92 determines that the engine start unit 96 has requested the engine start while the single rotary machine is running, the U / DHV mode (forward) is selected, that is, the clutch CL1 is engaged to start the engine 12. Determining whether or not the engine 12 is selected, that is, whether the U / DHV mode (forward) is selected or the O / DHV mode (forward) is selected, that is, the clutch CLc is engaged to start the engine 12. Determine if it is selected.

When the hybrid control unit 92 determines that the U / DHV mode (forward) is selected, that is, the clutch CL1 is selected to start the engine 12, the engine starting unit 96 engages the clutch CL1. The amount of heat QL required to raise the engine rotation speed Ne to a predetermined rotation speed Ne1 that can be completely detonated by (slip engagement or complete engagement) is calculated (estimated), and the calculated heat amount QL is within the permissible range. It is determined whether or not there is, that is, whether or not the calculated calorific value QL is smaller than the predetermined value QL1. The calorific value QL is related to, for example, all the total calorific value generated in the clutch CL1 or the clutch CL1 until the engine rotational speed Ne rises to a predetermined rotational speed Ne1 that can be completely detonated by engaging the clutch CL1. It is the amount of heat per unit time until the engine rotation speed Ne1 rises to a predetermined rotation speed Ne1 that can be completely detonated by matching. For example, the heat amount QL is the difference rotation of the clutch CL1 and the transmission torque transmitted to the clutch CL1. It is calculated based on the value multiplied by (engagement hydraulic pressure of the clutch CL1). The engine starting unit 96 calculates the calorific value QL from the actual vehicle speed V detected by the output rotation speed sensor 72, for example, by using a map in which the calorific value QL is calculated from the vehicle speed V during traveling. ing. Further, the predetermined value QL1 may reduce the durability of the clutch CL1 due to the frictional heat generated in the clutch CL1 when the engine rotation speed Ne is raised to the predetermined rotation speed Ne1 that can be completely detonated by engaging the clutch CL1. It is a calorific value QL set in advance by an experiment or the like, which enhances the property.

When the power transmission switching unit 94 determines in the engine starting unit 96 that the amount of heat QL generated by the clutch CL1 is within the allowable range, the hybrid control unit 92 makes a difference rotation of the clutch CL1, that is, the first carrier C1 and the first ring rear R1. The rotation speed of the second sun gear S2 of the second differential mechanism 40 is adjusted by the first rotary machine MG1 so that the difference rotation with the first carrier C1 is reduced, that is, the perfect synchronization between the first carrier C1 and the first ring gear R1 is accelerated. The clutch CL1 is engaged while being controlled.

The hybrid control unit 92 determines that the amount of heat QL generated by the clutch CL1 in the engine starting unit 96 is within the allowable range, and determines that the clutch CL1 is engaged in the power transmission switching unit 94, and the engine rotation speed Ne. Is increased to a predetermined rotation speed Ne1 that can be completely detonated, fuel is injected into the cylinder of the engine 12 and ignited. As a result, the engine 12 is started, and the U / DHV mode (forward) is achieved from the independently driven EV mode.

Further, when the hybrid control unit 92 determines that the O / DHV mode (forward) is selected, that is, the clutch CLc is engaged to start the engine 12, the engine starting unit 96 disengages the clutch CLc. The amount of heat Qc required to raise the engine rotation speed Ne to a predetermined rotation speed Ne1 that can be completely detonated by engaging (slip engagement or complete engagement) is calculated (estimated), and the calculated heat amount Qc is permissible. It is determined whether or not it is within the range, that is, whether or not the calculated calorific value QL is smaller than the predetermined value Qc1. The calorific value Qc relates to all the total calorific value generated by the clutch CLc or the clutch CLc until the engine rotational speed Ne rises to a predetermined rotational speed Ne1 that can be completely detonated by engaging the clutch CLc, for example. It is the amount of heat per unit time until the engine rotation speed Ne1 rises to a predetermined rotation speed Ne1 that can be completely detonated by combining them. For example, the heat amount Qc is the difference rotation of the clutch CLc and the transmission torque transmitted to the clutch CLc. It is calculated based on the value multiplied by (engagement hydraulic pressure of the clutch CLc). The engine starting unit 96 calculates the calorific value Qc from the actual vehicle speed V detected by the output rotation speed sensor 72, for example, by using a map in which the calorific value Qc is calculated from the vehicle speed V during traveling. ing. Further, the predetermined value Qc1 may reduce the durability of the clutch CLc due to the frictional heat generated by the clutch CLc when the engine rotation speed Ne is raised to the predetermined rotation speed Ne1 that can be completely detonated by engaging the clutch CLc. It is a calorific value Qc set in advance by an experiment or the like, which enhances the property.

When the power transmission switching unit 94 determines that the amount of heat Qc generated by the clutch CLc is within the allowable range in the engine starting unit 96, the hybrid control unit 92 makes a difference rotation of the clutch CLc, that is, the second carrier C2 and the first ring rear R1. The rotation speed of the second sun gear S2 of the second differential mechanism 40 is adjusted by the first rotary machine MG1 so that the difference rotation with the second carrier C2 is reduced, that is, the perfect synchronization between the second carrier C2 and the first ring gear R1 is accelerated. The clutch CLc is engaged while being controlled.

The hybrid control unit 92 determines that the amount of heat Qc generated by the clutch CLc in the engine starting unit 96 is within the allowable range, and determines that the clutch CLc is engaged in the power transmission switching unit 94, and the engine rotation speed Ne. Is increased to a predetermined rotation speed Ne1 that can be completely detonated, fuel is injected into the cylinder of the engine 12 and ignited. As a result, the engine 12 is started, and the O / DHV mode (forward) is achieved from the independently driven EV mode.

When the hybrid control unit 92 determines that the hybrid control unit 92 injects fuel into the cylinder of the engine 12 and ignites the engine, and the power transmission switching unit 94 determines that the engagement of the clutch CLc is completed, the engine start unit 96 starts the engine. It is determined whether or not the calorific value QL calculated by the unit 96 is not within the permissible range and the clutch CLc is engaged instead of the clutch CL1 to start the engine 12, that is, the U / DHV mode selected by the hybrid control unit 92 ( It is determined whether or not the O / DHV mode (forward) different from the forward) is achieved. For example, the engine starting unit 96 is different from the U / DHV mode (forward) selected by the hybrid control unit 92 when the heat quantity QL of the clutch CL1 calculated by the engine starting unit 96 described above is equal to or greater than a predetermined value QL1. It is determined that a different O / DHV mode (forward) has been achieved.

When the power transmission switching unit 94 determines that the engine starting unit 96 has achieved an O / DHV mode (forward) different from the U / DHV mode (forward) selected by the hybrid control unit 92, the power transmission switching unit 94 O / In order to return from the DHV mode (forward) to the U / DHV mode (forward) selected by the hybrid control unit 92, so-called clutch-to-clutch shift control in which the clutch CL1 and the clutch CLc are gripped is executed.

The hybrid control unit 92 determines that the calorific value QL generated by the clutch CL1 is not within the permissible range in the engine starting unit 96 and determines that the calorific value Qc generated by the clutch CLc is not within the permissible range, that is, the clutch CL1 and the clutch are determined in the engine starting unit 96. When it is determined that the calorific values QL and Qc generated in each of the CLc are equal to or higher than the predetermined values QL1 and Qc1, the first differential mechanism by the first rotating machine MG1 so that the differential rotation of the clutch CL1 or the clutch CLc becomes zero. The 38 and the second differential mechanism 40 carry out synchronous control (first synchronous control or second synchronous control) for synchronizing the rotational speeds of predetermined rotating elements. For example, in the hybrid control unit 92, when the U / DHV mode (forward) is selected in the hybrid control unit 92, that is, when the clutch CL1 is engaged and the engine 12 is started, the differential rotation of the clutch CL1 is changed. The first synchronous control for synchronizing the rotational speed of the first carrier C1 and the rotational speed of the first ring gear R1 is performed by the first rotary machine MG1 so as to be zero, that is, so that the differential rotation of the clutch CL1 is suppressed. do. Further, for example, the hybrid control unit 92 determines the clutch CLc when the O / DHV mode (forward) is selected in the hybrid control unit 92, that is, when the clutch CLc is engaged to start the engine 12. The second synchronization in which the rotation speed of the second carrier C2 and the rotation speed of the first ring gear R1 are synchronized by the first rotary machine MG1 so that the difference rotation becomes zero, that is, the difference rotation of the clutch CLc is suppressed. Implement control.

The power transmission switching unit 94 determines that the synchronous control (first synchronous control or the second synchronous control) has been performed by the hybrid control unit 92, and when the differential rotation of the clutch CL1 or the clutch CLc is within a predetermined value, the clutch CL1 or the clutch CL1 or Engage the clutch CLc. For example, the power transmission switching unit 94 engages the clutch CL1 when it is determined by the hybrid control unit 92 that the first synchronous control has been performed and the differential rotation of the clutch CL1 is within a predetermined value. Further, for example, the power transmission switching unit 94 engages the clutch CLc when it is determined by the hybrid control unit 92 that the second synchronous control has been performed and the differential rotation of the clutch CLc is within a predetermined value.

The hybrid control unit 92 determines that the hybrid control unit 92 has performed synchronous control (first synchronous control or second synchronous control), and the power transmission switching unit 94 determines that the clutch CL1 or the clutch CLc is engaged. Then, the engine rotation speed Ne is increased by the first rotary machine MG1 to a predetermined rotation speed Ne1 that can be completely detonated. Further, when the engine rotation speed Ne rises to a predetermined rotation speed Ne1 that can be completely detonated, the hybrid control unit 92 injects fuel into the cylinder of the engine 12 and ignites the engine. As a result, the engine 12 is started to achieve the U / DHV mode (forward) or the O / DHV mode (forward) selected by the hybrid control unit 92 from the single drive EV mode.

FIG. 21 shows the control in the case where the main part of the control operation of the electronic control device 90, that is, the clutch CL1 and the clutch CLc are released and the engine 12 is started from the single rotary machine running by the independent drive of the second rotary machine MG2. It is a flowchart explaining operation, and is executed repeatedly, for example. Note that FIG. 22 is an example of a time chart when the flowchart of FIG. 21 is executed.

21; It is determined whether or not there was an engine start request while the aircraft was running. If the judgment of S10 is denied, this routine is terminated, but if the judgment of S10 is affirmed (at the time of t1 in FIG. 22), S20 corresponding to the function of the hybrid control unit 92 is executed. In S20, it is determined whether or not the U / DHV mode (forward) is selected. When the judgment of S20 is affirmed, S30 corresponding to the function of the engine starting unit 96 is executed, but when the judgment of S20 is denied, that is, when the O / DHV mode (forward) is selected. S40 corresponding to the function of the engine starting unit 96 is executed. In S30, the calorific value QL required for the engine rotational speed Ne to rise to a predetermined rotational speed Ne1 capable of complete explosion by engaging the clutch CL1 is calculated, and whether or not the calculated calorific value QL is within the permissible range. Is judged. If the judgment of S30 is affirmed, S50 corresponding to the functions of the hybrid control unit 92 and the power transmission switching unit 94 is executed, but if the judgment of S30 is denied, S40 is executed. In S50, the rotation speed of the second sun gear S2 of the second differential mechanism 40 is controlled by the first rotary machine MG1 so that the differential rotation of the clutch CL1 is reduced, and the clutch CL1 is engaged. Next, in S60 corresponding to the function of the hybrid control unit 92, when the clutch CL1 is engaged in S50 and the engine rotation speed Ne rises to a predetermined rotation speed Ne1 capable of complete explosion, fuel is injected into the cylinder of the engine 12. And ignited. As a result, the engine 12 is started.

In S40, the amount of heat Qc required for the engine rotation speed Ne to rise to a predetermined rotation speed Ne1 capable of complete explosion by engaging the clutch CLc is calculated, and whether or not the calculated heat amount Qc is within the permissible range. Is judged. When the judgment of S40 is affirmed, S70 corresponding to the functions of the hybrid control unit 92 and the power transmission switching unit 94 is executed, but when the judgment of S40 is denied, that is, it occurs in each of the clutch CL1 and the clutch CLc. When the amount of heat QL and Qc to be generated is not within the permissible range, S80 corresponding to the function of the hybrid control unit 92 is executed. In S70, the rotation speed of the second sun gear S2 of the second differential mechanism 40 is controlled by the first rotary machine MG1 so that the differential rotation of the clutch CLc is reduced, and the clutch CLc is engaged. Next, in S90 corresponding to the function of the hybrid control unit 92, when the clutch CLc is engaged in S70 and the engine rotation speed Ne rises to a predetermined rotation speed Ne1 capable of complete explosion (at t2 in FIG. 22), the engine 12 Fuel is injected into the cylinder and ignited. As a result, the engine 12 is started. Next, in S100 corresponding to the function of the engine starting unit 96, it is determined whether or not the O / DHV mode (forward) different from the U / DHV mode (forward) selected in S20 is achieved. If the judgment of S100 is denied, this routine is terminated, but if the judgment of S100 is affirmed, that is, if the judgment of S30 is denied, S110 corresponding to the function of the power transmission switching unit 94 is displayed. Will be executed. In S110, in order to return to the U / DHV mode (forward) selected in S20, so-called clutch-to-clutch shift control is executed, in which the clutch CL1 and the clutch CLc are gripped and replaced.

In S80, the first rotary machine MG1 so that the differential rotation of the clutch CL1 or the clutch CLc corresponding to the traveling mode (U / DHV mode (forward) or O / DHV mode (forward)) selected in S20 becomes zero. In the first differential mechanism 38 and the second differential mechanism 40, synchronous control (first synchronous control or second synchronous control) for synchronizing the rotational speeds of predetermined rotating elements is performed. Next, in S120 corresponding to the functions of the power transmission switching unit 94 and the hybrid control unit 92, when the difference rotation of the clutch CL1 or the clutch CLc is within a predetermined value by S80, the clutch CL1 or the clutch CLc is engaged and the first The one-rotating machine MG1 raises the engine rotation speed Ne1 to a predetermined rotation speed Ne1 capable of complete explosion. Next, in S60, when the engine rotation speed Ne is increased to a predetermined rotation speed Ne1 that can be completely detonated in S120, fuel is injected into the cylinder of the engine 12 and ignited. As a result, the engine 12 is started.

As described above, according to the electronic control device 90 of the power transmission device 14 of the present embodiment, the clutch CL1 and the clutch CLc are released from each of the clutch CL1 and the clutch CLc. When the amount of heat QL generated by the clutch CL1 is equal to or greater than the predetermined value QL1 when the clutch of either the CL1 or the clutch CLc, that is, the clutch CL1 is engaged to start the engine 12, either the clutch CL1 or the clutch CLc The other clutch, that is, the clutch CLc, is engaged to start the engine 12. Therefore, the amount of heat QL generated by the clutch CL1 is equal to or greater than the predetermined value QL1, and the frictional heat generated by the clutch CL1 when the clutch CL1 is engaged to start the engine 12 may reduce the durability of the clutch CL1. If it is high, the clutch CLc is engaged to start the engine 12. Further, when the amount of heat QL generated by the clutch CL1 is smaller than the predetermined value QL1 and it is unlikely that the durability of the clutch CL1 is lowered by the frictional heat generated by the clutch CL1 when the clutch CL1 is engaged and the engine 12 is started. The engine 12 is started by engaging the clutch CL1. As a result, the engine 12 can be suitably started from the traveling of the second rotating machine MG2 by the independent driving of the second rotating machine MG2 while suppressing the deterioration of the durability of the clutch CL1.

Further, according to the electronic control device 90 of the power transmission device 14 of the present embodiment, when the clutch CL1 is engaged and the engine 12 is started from the traveling of the single rotary machine, it is generated in each of the clutch CL1 and the clutch CLc. When the calorific values QL and Qc are equal to or higher than the predetermined values QL1 and Qc1, the clutch CL1 is engaged after the first synchronous control for suppressing the differential rotation of the clutch CL1 by the first rotary machine MG1 is performed, and the first rotary machine is engaged. The engine 12 is started by MG1. Therefore, the calorific values QL and Qc generated by the clutch CL1 and the clutch CLc are equal to or higher than the predetermined values QL1 and Qc1, respectively, and the clutch CL1 or the clutch is used when the clutch of the clutch CL1 or the clutch CLc is engaged to start the engine 12. If there is a high possibility that the durability of the clutch CL1 or the clutch CLc will decrease due to the frictional heat generated by the CLc, the clutch CL1 will be engaged after the first synchronous control is performed, and the engine 12 will be operated by the first rotary machine MG1. It can be started.

Further, according to the electronic control device 90 of the power transmission device 14 of the present embodiment, when the clutch CLc is engaged and the engine 12 is started from the traveling of the single rotary machine, it is generated in each of the clutch CL1 and the clutch CLc. When the calorific values QL and Qc are equal to or higher than the predetermined values QL1 and Qc1, the clutch CLc is engaged after the second synchronous control for suppressing the differential rotation of the clutch CLc by the first rotary machine MG1 is performed, and the first rotary machine is engaged. The engine 12 is started by MG1. Therefore, the calorific values QL and Qc generated by the clutch CL1 and the clutch CLc are equal to or higher than the predetermined values QL1 and Qc1, respectively, and the clutch CL1 or the clutch is used when the clutch of the clutch CL1 or the clutch CLc is engaged to start the engine 12. If there is a high possibility that the durability of the clutch CL1 or the clutch CLc will decrease due to the frictional heat generated by the CLc, the clutch CLc will be engaged after the second synchronous control is performed, and the engine 12 will be operated by the first rotary machine MG1. It can be started.

Although the examples of the present invention have been described in detail with reference to the drawings, the present invention also applies to other aspects.

For example, in the above-described first embodiment, the clutch CL1 that selectively engages the first rotating element RE1 and the second rotating element RE2 is exemplified as the first engaging element, but the present invention is not limited to this embodiment. For example, the first engaging element may be a clutch that selectively engages the second rotating element RE2 and the third rotating element RE3, or may selectively engage the first rotating element RE1 and the third rotating element RE3. A matching clutch may be used. In short, the first engaging element may be a clutch that engages any two rotating elements of the first rotating element RE1, the second rotating element RE2, and the third rotating element RE3.

Further, in the above-described first embodiment, a co-line diagram (FIG. 4-Fig. 4) capable of relatively representing the rotation speeds of the rotating elements RE1-RE6 in each of the first differential mechanism 38 and the second differential mechanism 40. (18), the vertical line Y1 is the rotation speed of the fourth rotating element RE4 to which the first rotating machine MG1 is connected, and the vertical line Y2 is the rotating speed of the first rotating element RE1 to which the engine 12 is connected. Y3 connects the rotation speed of the second rotating element RE2 selectively connected to the case 18 via the brake BR1 and the rotation speed of the fifth rotating element RE5 connected to the output shaft 24, and the vertical line Y4 connects them to each other. The rotation speeds of the third rotating element RE3 and the sixth rotating element RE6 are shown, respectively, but the present invention is not limited to this embodiment. For example, the vertical line Y1 vertically indicates the rotation speed of the second rotating element RE2 selectively connected to the case 18 via the brake BR1 and the rotation speed of the fourth rotating element RE4 to which the first rotating machine MG1 is connected. The line Y2 is the rotation speed of the first rotating element RE1 to which the engine 12 is connected, the vertical line Y3 is the rotation speed of the fifth rotating element RE5 connected to the output shaft 24, and the vertical line Y4 is connected to each other. The first differential mechanism and the second difference so that the rotation speeds of the rotation elements RE1-RE6 are relatively represented in the co-figure showing the rotation speeds of the third rotation element RE3 and the sixth rotation element RE6, respectively. A dynamic mechanism may be configured. In this case, the clutch CLc is a second engaging element that selectively engages the second rotating element RE2 and the fourth rotating element RE4. In this case, the U / DHV mode reverse input (reverse), which is realized with the brake BR1 engaged, cannot be established. In the U / DHV mode (forward), it is realized in the state where the clutch CL1 is engaged, in the case of low input in which the engine rotation speed Ne is input at a constant speed, and in the state where the brake BR1 is engaged. It is possible to establish the case of high input in which the engine speed Ne is increased and input.

Further, in the above-described embodiment, the engine braking is used in combination with the first traveling mode (U / DHV mode (forward), U / DHV mode forward rotation input (reverse), and U / D input split) with the clutch CL1 engaged. Mode) is established, and the engine braking in the second driving mode (O / DHV mode (forward), O / DHV mode forward input (reverse), and O / D input split) with the clutch CLc engaged. The combined mode) was established, but the present invention is not limited to this mode. For example, the first differential mechanism and the second differential are established so that the first traveling mode is established with the clutch CLc engaged and the second traveling mode is established with the clutch CL1 engaged. The mechanism may be configured.

In this case, in the co-line diagram capable of relatively representing the rotation speeds of the rotating elements RE1-RE6 in each of the first differential mechanism and the second differential mechanism, the vertical line Y1 is the first rotating machine MG1. The rotation speed of the 4th rotation element RE4 connected to each other, the vertical line Y2 is the rotation speed of the 3rd rotation element RE3 and the 6th rotation element RE6 connected to each other, and the vertical line Y3 is the case via the brake BR1. The rotation speed of the second rotation element RE2 selectively connected to 18 and the rotation speed of the fifth rotation element RE5 connected to the output shaft 24 are shown. The vertical line Y4 is the rotation speed of the first rotation element RE1 to which the engine 12 is connected. The rotation speed of each is shown. In this configuration, the clutch CLc is a second engaging element that selectively engages the second rotating element RE2 and the fifth rotating element RE5.

Alternatively, in a co-line diagram capable of relatively representing the rotation speeds of the rotating elements RE1-RE6 in each of the first differential mechanism and the second differential mechanism, the vertical line Y1 is connected to the case 18 via the brake BR1. The vertical line Y2 is the rotation speed of the second rotation element RE2 selectively connected and the rotation speed of the fourth rotation element RE4 to which the first rotation machine MG1 is connected, and the vertical line Y2 is connected to each other. And the rotation speed of the sixth rotation element RE6, the vertical line Y3 is the rotation speed of the fifth rotation element RE5 connected to the output shaft 24, and the vertical line Y4 is the rotation speed of the first rotation element RE1 to which the engine 12 is connected. Are shown respectively. In this configuration, the clutch CLc is a second engaging element that selectively engages the second rotating element RE2 and the fourth rotating element RE4.

Further, in the first differential mechanism 38 and the second differential mechanism 40 of the above-described embodiment, the brake BR1 is configured to fix the second rotating element RE2, that is, the first ring gear R1 so as not to rotate. For example, the first differential mechanism and the second differential mechanism may be configured so that the brake fixes the first rotating element so that it cannot rotate.

Further, in the above-described first embodiment, the first differential mechanism 38 is a double pinion type planetary gear mechanism, and the second differential mechanism 40 is a single pinion type planetary gear mechanism, but the present invention is not limited to this mode. .. For example, the first differential mechanism may be configured by a single pinion type planetary gear mechanism. Alternatively, the second differential mechanism may be configured by a double pinion type planetary gear mechanism.

Further, in the above-described embodiment, the clutch CL1, the brake BR1, and the clutch CLc are wet hydraulic friction engaging devices, but they may be engaging elements whose operating states can be switched by electric power.

Further, in the above-described embodiment, the vehicle 10 is provided with the brake BR1, but the brake BR1 does not necessarily have to be provided. Even in the vehicle 10 not provided with the brake BR1, the independent drive EV mode, the HV driving mode, and the standby mode can be established, and the U / DHV mode and the O / DHV mode can be switched in the HV driving mode. Can be done. Further, the vehicle 10 is a gear train having a connection relationship in which the second power transmission unit 22 is arranged coaxially with the input shaft 36. For example, the second power transmission unit 22 is the axis of the input shaft 36. It may be a gear train having a connection relationship such that it is arranged on another axis. Further, although the invention has been described using the power transmission device 14 preferably used for the FR type vehicle 10, the present invention is appropriately used for the power transmission device used for vehicles of other types such as the FF type and the RR type. Can be applied.

It should be noted that the above is only one embodiment, and the present invention can be implemented in a mode in which various changes and improvements are made based on the knowledge of those skilled in the art.

12: Engine
14: Power transmission device (power transmission device for vehicles)
24: Output shaft 38: First differential mechanism C1: First carrier (first rotating element)
R1: 1st ring gear (2nd rotating element)
S1: 1st sun gear (3rd rotating element)
40: 2nd differential mechanism S2: 2nd sun gear (4th rotating element)
C2: 2nd carrier (5th rotating element)
R2: 2nd ring gear (6th rotating element)
90: Electronic control device (control device)
92: Hybrid control unit 94: Power transmission switching unit 96: Engine starting unit CL1: Clutch (first engaging element)
CLc: Clutch (second engaging element)
MG1: 1st rotary machine MG2: 2nd rotary machine QL: Calorific value QL1: Predetermined value

Claims (1)

A first differential mechanism including a first rotating element, a second rotating element, and a third rotating element, a second differential mechanism including a fourth rotating element, a fifth rotating element, and a sixth rotating element, and the first The rotation of the first engaging element that engages any two of the third rotating elements from the one rotating element, and the rotation of any one of the second rotating element, the fourth rotating element, and the fifth rotating element. The third rotating element is connected to the sixth rotating element, the fifth rotating element is connected to the output shaft, and the first rotating element is an engine. The fourth rotating element is connected to the first rotating machine, and the output shaft is a control device of the vehicle power transmission device connected to the second rotating machine.
Either the first engaging element or the second engaging element from the traveling of the single rotating machine which releases the first engaging element and the second engaging element and travels by the independent driving of the second rotating machine. When the amount of heat generated by either the first engaging element or the second engaging element when the engine is started by engaging one of them is equal to or more than a predetermined value, the said Engage the other engaging element of either the first engaging element or the second engaging element to start the engine .
When the engine is started by engaging the one engaging element from the traveling of the single rotary machine, the amount of heat generated by each of the first engaging element and the second engaging element is equal to or higher than the predetermined value. In this case, after the synchronous control for suppressing the differential rotation of the one engaging element by the first rotating machine is performed, the one engaging element is engaged and the engine is started by the first rotating machine. It is not control apparatus for a vehicular power transmitting device according to claim Rukoto.

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