Vehicle Drive System

Abstract

To make it possible to execute rotation speed control of a rotating electric machine in a vehicle drive system for driving a vehicle in which a first engagement device, the rotating electric machine, a second engagement device, and an automatic transmission are provided on a power transmission path connecting an internal combustion engine and a wheel to each other.SOLUTION: A second control device, which controls at least an automatic transmission, outputs purpose information indicating a purpose of rotation speed control simultaneously when commanding execution of the rotation speed control for a first control device which controls a rotating electric machine. The first control device selects one control setting from a plurality of control setting according to the purpose information, and executes the rotation speed control by use of the selected control setting.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a vehicle drive system. [Background technology]

[0002] A vehicle drive system is used to drive a vehicle in which a first engagement device, a rotating electric machine, a second engagement device, and an automatic transmission (the second engagement device may be provided within the automatic transmission; the same applies below) are provided in a power transmission path connecting an internal combustion engine and wheels. An example of such a vehicle drive system is disclosed in Japanese Patent Laid-Open Publication No. 2018-39317 (Patent Document 1).

[0003] The system of Patent Document 1 includes a vehicle drive system (parallel hybrid drive system) in which a first engagement device (first clutch 2), a rotating electric machine (drive motor 3), a second engagement device (second clutch 4), and an automatic transmission (transmission 5) are provided in a power transmission path connecting an internal combustion engine (engine 1) and wheels (drive wheels 23), a first control device (motor controller 19) that controls the rotating electric machine, and a second control device (transmission controller 16) that controls at least the automatic transmission.

[0004] In the system of Patent Document 1, in internal combustion engine start control, after the start of the internal combustion engine is completed, control is performed to reduce the target rotation speed of the rotating electric machine toward the slip convergence rotation speed of the second engagement device while maintaining control that sets the transfer torque capacity of the second engagement device equivalent to the vehicle required torque. At this time, the first control device is configured to switch control settings (first motor rotation speed control law / second motor rotation speed control law) for controlling the rotation speed of the rotating electric machine based on the magnitude relationship between the differential rotation speed (slip rotation speed) of the second engagement device and a predetermined threshold value (predetermined value).

[0005] However, there have been cases where the rotational speed control of the rotating electric machine is not necessarily performed at an optimal control setting simply based on the magnitude relationship between the differential rotational speed of the second engagement device and the threshold value. For example, the optimal control setting for the rotational speed control of the rotating electric machine may change depending on the purpose, but there have been cases where the rotational speed control is performed at a control setting that is not optimal in view of the purpose of the rotational speed control simply based on the magnitude relationship between the differential rotational speed of the second engagement device and the threshold value. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2018-39317 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, in a vehicle drive system that drives a vehicle in which a first engagement device, a rotating electric machine, a second engagement device, and an automatic transmission are provided in a power transmission path connecting an internal combustion engine and wheels, it is desirable to be able to control the rotational speed of the rotating electric machine with optimal control settings. [Means for solving the problem]

[0008] A vehicle drive system according to the present disclosure includes: a vehicle drive device in which a first engagement device, a rotary electric machine, and a second engagement device are provided in this order from the input member side in a power transmission path that connects an input member that is drivingly connected to an internal combustion engine and an output member that is drivingly connected to a wheel, and an automatic transmission is provided on the power transmission path closer to the output member than the rotary electric machine; a first control device that controls the rotating electric machine; A vehicle drive system including a second control device that controls at least the automatic transmission, the first control device is capable of performing rotation speed control to control the rotation speed of the rotating electric machine so as to approach a target rotation speed, the second control device is capable of instructing the first control device to execute the rotational speed control, and when instructing the first control device to execute the rotational speed control, outputs to the first control device, together with the execution command for the rotational speed control, a target command indicating the target rotational speed and purpose information indicating a purpose of the rotational speed control; The first control device is provided with a plurality of selectable control settings to be used for the rotational speed control, and when it receives the execution command, it selects one of the plurality of control settings according to the target information received along with the execution command, and executes the rotational speed control using the selected control setting so as to bring the rotational speed of the rotating electric machine closer to the target rotational speed indicated in the target command.

[0009] According to this configuration, when the second control device commands the first control device to execute rotational speed control, it outputs the execution command, a target command indicating a target rotational speed, and also output purpose information indicating the purpose of the rotational speed control. The first control device, having received the purpose information along with the execution command and target command, selects one control setting from among a plurality of control settings in accordance with the purpose information and executes rotational speed control using the selected control setting. This allows the rotational speed control of the rotating electric machine to be executed using the optimal control setting in accordance with the purpose of the rotational speed control.

[0010] Further features and advantages of the techniques according to the present disclosure will become more apparent from the following description of exemplary and non-limiting embodiments, which proceeds with reference to the drawings. [Brief explanation of the drawings]

[0011] [Figure 1] Schematic diagram of vehicle drive system [Figure 2] FIG. 10 is a diagram showing an example of association between purpose information and control settings. [Figure 3] Time chart of internal combustion engine start control DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of a vehicle drive system will be described with reference to the drawings. This vehicle drive system 1 is a system for driving a vehicle (hybrid vehicle) equipped with both an internal combustion engine EG and a rotating electric machine 24. The vehicle drive system 1 of this embodiment includes a vehicle drive device 2 that is drivingly connected to the internal combustion engine EG as a first drive power source for the wheels W and that includes the rotating electric machine 24 as a second drive power source for the wheels W, and a control system that controls each part of the vehicle drive device 2.

[0013] In the following description, "driving connection" refers to a state in which two rotating elements are connected so as to be able to transmit a driving force (synonymous with torque). This concept includes a state in which two rotating elements are connected so as to rotate together, and a state in which two rotating elements are connected so as to be able to transmit a driving force via one or more transmission members. Such transmission members include various members (shafts, gear mechanisms, belts, etc.) that transmit rotation at the same speed or at variable speeds, and may also include engagement devices (friction engagement devices, meshing engagement devices, etc.) that selectively transmit rotation and driving force.

[0014] Furthermore, the term "rotating electric machine" is used as a concept that includes motors (electric motors), generators (electric generators), and motor-generators that function as both motors and generators as needed.

[0015] As shown in FIG. 1 , the vehicle drive system 2 includes a power transmission path connecting an input member 21 drivably connected to the internal combustion engine EG and an output member 30 drivably connected to wheels W. The power transmission path connects the input member 21, which is drivably connected to the internal combustion engine EG, and the output member 30, which is drivably connected to wheels W. The power transmission path also includes the input member 21, an intermediate member 23, a transmission input member 26, a transmission output member 28, and an output member 30. The input member 21, the disengagement engagement device 22, the rotary electric machine 24, the intermediate member 23, the transmission engagement device 25, the transmission input member 26, the automatic transmission 27, the transmission output member 28, the differential gear device 29, and the output member 30 are arranged in the listed order from the internal combustion engine EG (input member 21) side in the power transmission path. The vehicle drive system 2 also includes an oil pump OP drivably connected to the rotary electric machine 24.

[0016] The input member 21 is drivingly connected to the internal combustion engine EG. The internal combustion engine EG is a prime mover (such as a gasoline engine or a diesel engine) that is driven by the combustion of fuel inside the engine to extract power. The input member 21 is formed, for example, by a shaft member (input shaft). The input member 21 is drivingly connected to an internal combustion engine output member (such as a crankshaft), which is an output member of the internal combustion engine EG, so as to rotate integrally with the internal combustion engine output member. The input member 21 and the internal combustion engine output member may be directly connected to each other, or may be connected via another member such as a damper. The input member 21 is drivingly connected to an intermediate member 23 via a disconnecting engagement device 22.

[0017] The intermediate member 23 is drivingly connected to the rotating electric machine 24. The intermediate member 23 is formed of, for example, a shaft member (intermediate shaft). The intermediate member 23 is drivingly connected to the rotor of the rotating electric machine 24 and its output member, which is a rotating electric machine output member (rotor shaft, etc.), so as to rotate integrally with them. The intermediate member 23 and the rotating electric machine 24 may be directly connected to each other, or may be connected to each other via another member. An oil pump OP is drivingly connected to the intermediate member 23.

[0018] The disengaging engagement device 22 selectively connects the input member 21 and the intermediate member 23. In other words, the disengaging engagement device 22 can release the connection between the internal combustion engine EG and the rotating electric machine 24. A hydraulically driven friction engagement device can be used as the disengaging engagement device 22, and specifically, for example, a wet multi-plate clutch or the like can be used. In this embodiment, the disengaging engagement device 22 corresponds to the "first engagement device CL1."

[0019] The rotating electric machine 24 includes a stator fixed to a case (not shown), which is a non-rotating member, and a rotor rotatably supported radially inside the stator. The rotating electric machine 24 receives a supply of electric power from an electric storage device (not shown) for power running, or supplies electric power generated by the driving force of the internal combustion engine EG or the inertial force of the vehicle to the electric storage device for storage. The rotor of the rotating electric machine 24 is drivingly connected to an intermediate member 23 so as to rotate integrally with the intermediate member 23. The intermediate member 23 is drivingly connected to a transmission input member 26 via a transmission engagement device 25. The transmission input member 26 is an input member of an automatic transmission 27. The transmission input member 26 is formed, for example, by a shaft member (transmission input shaft).

[0020] The transmission engagement device 25 selectively connects the intermediate member 23 and the transmission input member 26. In other words, the transmission engagement device 25 can release the connection between the rotating electric machine 24 and the automatic transmission 27. As with the disengagement engagement device 22, a hydraulically driven friction engagement device can be used as the transmission engagement device 25, and more specifically, for example, a wet multi-plate clutch can be used. In this embodiment, the transmission engagement device 25 corresponds to the "second engagement device CL2."

[0021] The automatic transmission 27 changes the rotational speed of the transmission input member 26 and transmits the rotational speed to the transmission output member 28. The automatic transmission 27 of this embodiment is configured as a stepped automatic transmission, and includes at least one planetary gear device and at least one transmission engagement device (including a clutch and a brake). As the transmission engagement device, a hydraulically driven friction engagement device can be used, similar to the disengagement engagement device 22 and the transmission engagement device 25, and specifically, for example, a wet multi-plate clutch can be used.

[0022] The disengagement engagement device 22 as the first engagement device CL1, the transmission engagement device 25 as the second engagement device CL2, and the gear shift engagement device are each switchable between a direct engagement state, a slip engagement state, and a release state. The direct engagement state is a state in which the rotating members on both sides of each engagement device are engaged so as to rotate integrally. The slip engagement state is a state in which the rotating members on both sides of each engagement device are engaged so as to transmit torque while having differential rotation. These direct engagement state and slip engagement state are sometimes collectively referred to as the engagement state. The release state is a state in which rotation and torque are not transmitted between the rotating members on both sides of each engagement device.

[0023] The automatic transmission 27 can selectively establish one of a plurality of gear stages depending on the engagement state of each of the gear shift engagement devices. The automatic transmission 27 then changes the rotation speed of the transmission input member 26 based on a gear ratio corresponding to the established gear stage, and transmits the rotation speed to the transmission output member 28. Note that the "gear ratio" is the ratio of the rotation speed of the transmission input member 26 to the rotation speed of the transmission output member 28, and is calculated as the value obtained by dividing the rotation speed of the transmission input member 26 by the rotation speed of the transmission output member 28. The transmission output member 28 is formed, for example, by a shaft member (transmission output shaft).

[0024] The transmission output member 28 is drivingly connected to a pair of left and right output members 30 (e.g., shaft members (output shafts)) via a differential gear device 29, and is further drivingly connected to a pair of left and right wheels W. This allows the vehicle drive device 2 to transmit the driving force of at least one of the internal combustion engine EG and the rotating electric machine 24 to the wheels W to drive the vehicle.

[0025] As described above, the oil pump OP is drivingly connected to the intermediate member 23. The oil pump OP is driven by the rotating electric machine 24, which rotates integrally with the intermediate member 23, to discharge oil, and supplies the discharged oil to the automatic transmission 27 (gear-shift engagement device) via a hydraulic control device (not shown). The oil pump OP also supplies the discharged oil to the disengagement engagement device 22 and the transmission engagement device 25 via the hydraulic control device.

[0026] 1, in this embodiment, the control system that controls each part of the vehicle drive device 2 includes an integrated control device 41, an internal combustion engine control device 42, a clutch control device 43, a rotating electrical machine control device 44, and an automatic transmission control device 45. Each of these control devices is configured by software (programs) stored in a storage medium such as a memory, or by hardware such as a separately provided arithmetic circuit, or by both. Each functional part is configured to be able to exchange information with another.

[0027] The control system is also configured to be able to acquire information on the detection results of various sensors provided in various parts of the vehicle equipped with the vehicle drive device 2. Examples of such sensors include a sensor that detects the rotational speed of the input member 21 and the internal combustion engine EG that rotates integrally therewith, a sensor that detects the rotational speed of the intermediate member 23 and the rotating electric machine 24 that rotates integrally therewith, a sensor that detects the rotational speed of the transmission input member 26, and a sensor that detects the rotational speed of the transmission output member 28. The sensors may also include sensors that detect the accelerator opening, the amount of brake operation, the amount of electricity stored in the electricity storage device, etc.

[0028] The integrated control device 41 performs control that integrates various controls (torque control, rotational speed control, engagement control, etc.) performed on the internal combustion engine EG, the disengagement engagement device 22, the rotating electric machine 24, the transfer engagement device 25, the automatic transmission 27 (shift engagement device), etc. for the entire vehicle. The integrated control device 41 controls the internal combustion engine EG via an internal combustion engine control device 42, controls the engagement states of the disengagement engagement device 22 and the transfer engagement device 25 via a clutch control device 43, and controls the rotating electric machine 24 via a rotating electric machine control device 44. The integrated control device 41 also controls the automatic transmission 27 (the engagement states of the shift engagement devices) via an automatic transmission control device 45. In this embodiment, the integrated control device 41 that controls the automatic transmission 27 via the automatic transmission control device 45 corresponds to the "second control device CT2."

[0029] The integrated control device 41 calculates the vehicle torque required to drive the vehicle based on sensor detection information (mainly information on accelerator pedal position and vehicle speed). The integrated control device 41 also determines the driving mode based on sensor detection information (mainly information on accelerator pedal position, vehicle speed, and amount of electricity stored in the electricity storage device). The driving modes that the integrated control device 41 can select include an electric driving mode and a hybrid driving mode.

[0030] The electric driving mode is a driving mode in which the vehicle travels by transmitting only the driving force of the rotating electric machine 24 to the wheels W. The electric driving mode is realized when the disengagement engagement device 22 (first engagement device CL1) is in a disengaged state and the transmission engagement device 25 (second engagement device CL2) is in an engaged state. The hybrid driving mode is realized when both the disengagement engagement device 22 (first engagement device CL1) and the transmission engagement device 25 (second engagement device CL2) are in an engaged state. Switching between the electric driving mode and the hybrid driving mode can be performed by switching the engagement state of the disengagement engagement device 22 (first engagement device CL1). The integrated control device 41 executes internal combustion engine start control, for example, when transitioning from the electric driving mode to the hybrid driving mode. At that time, the integrated control device 41 outputs various control commands associated with the execution of the internal combustion engine start control. As an example, when executing internal combustion engine start control, the integrated control device 41 (second control device CT2) of this embodiment instructs the clutch control device 43 to execute control to place each engagement device 22, 25 in a slip engagement state, and also instructs the rotating electric machine control device 44 to execute rotational speed control.

[0031] The internal combustion engine control device 42 controls the internal combustion engine EG. The internal combustion engine control device 42 is capable of switching between torque control and rotational speed control of the internal combustion engine EG according to the running state of the vehicle, for example, based on a command from the integrated control device 41. The torque control of the internal combustion engine EG is a control that commands a target torque to the internal combustion engine EG and causes the output torque of the internal combustion engine EG to follow the target torque. The rotational speed control of the internal combustion engine EG is a control that commands a target rotational speed to the internal combustion engine EG and determines the output torque so that the rotational speed of the internal combustion engine EG follows the target rotational speed.

[0032] The clutch control device 43 controls the engagement state of the disengagement engagement device 22, which is the first engagement device CL1, and the engagement state of the transmission engagement device 25, which is the second engagement device CL2. The clutch control device 43 controls the engagement state of each engagement device so as to achieve the driving mode determined by the integrated control device 41. Furthermore, during mode transition, the clutch control device 43 controls the oil pressure supplied to each engagement device (and therefore the transmission torque capacity) so as to change in a predetermined manner. The clutch control device 43 adjusts the oil pressure of the hydraulic oil supplied from the oil pump OP using a hydraulic control device (not shown), and supplies the adjusted hydraulic oil to each engagement device.

[0033] The rotating electric machine control device 44 controls the rotating electric machine 24. The rotating electric machine control device 44 can execute torque control and rotational speed control of the rotating electric machine 24 according to the running state of the vehicle, for example, based on a command from the integrated control device 41. Torque control of the rotating electric machine 24 is a control that commands a target torque to the rotating electric machine 24 and makes the output torque of the rotating electric machine 24 follow the target torque. Rotational speed control of the rotating electric machine 24 is a control that commands a target rotational speed to the rotating electric machine 24 and determines the output torque so that the rotational speed of the rotating electric machine 24 follows the target rotational speed. It is also possible to execute torque control and rotational speed control of the rotating electric machine 24 simultaneously. In this embodiment, the rotating electric machine control device 44 corresponds to the "first control device CT1."

[0034] In this embodiment, the rotating electric machine control device 44 is provided with a plurality of selectable control settings to be used for controlling the rotational speed of the rotating electric machine 24. Here, the control settings refer to settings that define detailed control characteristics in rotational speed control. In this embodiment, the plurality of selectable control settings by the rotating electric machine control device 44 include at least a response-priority setting and a stability-priority setting.

[0035] The responsiveness-priority setting is a control setting that prioritizes responsiveness in rotational speed control. That is, the responsiveness-priority setting is a control setting that prioritizes bringing the rotational speed of the rotating electric machine 24 closer to the target rotational speed as quickly as possible. The responsiveness-priority setting is a control setting that can bring the rotational speed of the rotating electric machine 24 closer to the target rotational speed at least more quickly than the stability-priority setting. The responsiveness-priority setting is, for example, a setting in which a feedback gain (PID control gain) in rotational speed feedback control of the rotating electric machine 24 is relatively high. Alternatively, the responsiveness-priority setting is, for example, a setting in which a disturbance observer is activated during rotational speed feedback control of the rotating electric machine 24. Here, the disturbance observer is a controller that estimates a torque (disturbance torque) that prevents the rotational speed of the rotating electric machine 24 from following the target rotational speed and adds a torque that cancels the estimated disturbance torque to the feedback torque in the rotational speed feedback control. A disturbance observer with general specifications can be used as appropriate.

[0036] In particular, when the disturbance observer is operated in a response priority setting, it is preferable because the disturbance resistance is high and correction to the disturbance can be performed with high response, thereby improving the followability of the rotation speed of the rotating electrical machine 24.

[0037] The stability priority setting is a control setting that prioritizes stability in rotational speed control. That is, the stability priority setting is a control setting that prioritizes minimizing fluctuations in feedback torque in rotational speed feedback control of the rotating electric machine 24. The stability priority setting is a control setting that can at least suppress fluctuations in feedback torque in rotational speed feedback control of the rotating electric machine 24 compared to the responsiveness priority setting. The stability priority setting is, for example, a setting in which the feedback gain (gain of PID control) in the rotational speed feedback control of the rotating electric machine 24 is relatively low. Alternatively, the responsiveness priority setting is, for example, a setting in which the disturbance observer is deactivated during execution of rotational speed feedback control of the rotating electric machine 24. The disturbance observer is as described above.

[0038] When executing rotational speed control of the rotating electric machine 24, the rotating electric machine control device 44 selects one control setting from among a plurality of control settings and executes rotational speed control using the selected control setting. In this embodiment, the rotating electric machine control device 44 executes rotational speed control by selectively using either a response-priority setting or a stability-priority setting. The method for selecting the control setting will be described later.

[0039] The automatic transmission control device 45 controls the automatic transmission 27. The automatic transmission control device 45 controls the engagement state of the gear-shift engagement devices provided in the automatic transmission 27. The clutch control device 43 controls the engagement state of each gear-shift engagement device so as to achieve the target gear position determined by the integrated control device 41. The clutch control device 43 adjusts the hydraulic pressure of the hydraulic oil supplied from the oil pump OP using a hydraulic control device (not shown), and supplies the adjusted hydraulic oil to each gear-shift engagement device.

[0040] Hereinafter, a method for selecting control settings in the rotational speed control of the rotating electrical machine 24 will be described using an example of internal combustion engine startup control.

[0041] As described above, when executing internal combustion engine start control, the integrated control device 41 commands the clutch control device 43 to execute control to place the engagement devices 22, 25 in a slip engagement state, and commands the rotating electric machine control device 44 to execute rotational speed control. The reason for placing the disengagement engagement device 22 in a slip engagement state is to provide the disengagement engagement device 22 with a transmission torque capacity so that the internal combustion engine EG can be cranked by the torque of the rotating electric machine 24. The reason for placing the transfer engagement device 25 in a slip engagement state is to prevent torque fluctuations at the time of initial combustion of the internal combustion engine EG from being transmitted to the wheels W.

[0042] The rotational speed control of the rotating electric machine 24 is executed in order to increase the rotational speed of the rotating electric machine 24 and reliably bring the engagement devices 22, 25 into a slip engagement state. In particular, in relation to the engagement state of the transfer engagement device 25, the differential rotational speed is increased from zero to a predetermined speed by the rotational speed control of the rotating electric machine 24 in order to bring the previous direct engagement state into a slip engagement state. In this way, one of the purposes of the rotational speed control of the rotating electric machine 24 is to generate a differential rotational speed in the transfer engagement device 25, which has a differential rotational speed of zero (hereinafter referred to as "differential rotation generation").

[0043] Furthermore, after the differential rotation speed reaches a predetermined speed, the differential rotation speed of the transfer engagement device 25 is maintained so that the slip engagement state continues stably. In this way, one of the purposes of the rotation speed control of the rotating electric machine 24 is to maintain the differential rotation speed of the transfer engagement device 25 that has reached a predetermined speed (hereinafter referred to as "maintaining differential rotation").

[0044] Furthermore, once the output torque of the internal combustion engine EG has stabilized after it has started, it is no longer necessary to keep the transfer engagement device 25 in a slip engagement state, so the differential rotation speed of the transfer engagement device 25 is reduced toward zero, for example, in order to re-engage the transfer engagement device 25. In this way, one of the purposes of the rotation speed control of the rotating electric machine 24 is to converge the differential rotation speed of the transfer engagement device 25, which has completed its role upon completion of the start of the internal combustion engine EG, toward zero (hereinafter referred to as "differential rotation convergence").

[0045] Thus, even when taking the rotational speed control of the rotating electric machine 24 associated with internal combustion engine startup control as an example, the purpose of the rotational speed control differs depending on the situation. Furthermore, the control characteristics required for the rotational speed control of the rotating electric machine 24 often differ depending on the purpose.

[0046] Taking these points into consideration, when the integrated control device 41 (second control device CT2) of this embodiment commands the rotating electrical machine control device 44 (first control device CT1) to execute rotational speed control, it also outputs purpose information indicating the purpose of the rotational speed control. Normally, only a target command indicating a target rotational speed is output together with an execution command for rotational speed control, but in this embodiment, in addition to the execution command and target command, purpose information is also output to the rotating electrical machine control device 44 (first control device CT1).

[0047] 2, the target information is configured by a combination of a target object and an action. As explained above, the rotational speed control of the rotary electric machine 24 accompanying the internal combustion engine start control may be performed for the purpose of generating a differential rotation of the transfer engagement device 25 (second engagement device CL2), maintaining a differential rotation of the transfer engagement device 25, and converging a differential rotation of the transfer engagement device 25. In these cases, the target object is always the "transfer engagement device 25," and the target actions are "generating a differential rotation," "maintaining a differential rotation," and "converging a differential rotation," respectively, and a portion of the target information is configured by a combination of these.

[0048] As another example, the rotational speed control of the rotating electric machine 24 may also be executed for the purpose of pre-filling the oil pump OP and the oil passages extending therefrom with oil that has leaked out due to a long vehicle stop. The oil pump OP, which is drivingly connected to the intermediate member 23, is driven by the torque of the rotating electric machine 24 to discharge oil, thereby pre-filling the oil pump OP and the oil passages with oil. In this case, the target object is the "oil pump OP," and the target operation is a "startup process" that represents pre-filling in accordance with a predetermined startup sequence, and a combination of these constitutes part of the target information.

[0049] In this way, the target information includes the content of the operation to be performed using the target object, and specifically includes at least one of the content of the operation to be performed using the transmission engagement device 25 (second engagement device CL2) and the content of the operation to be performed using the oil pump OP (both in this embodiment).

[0050] When the integrated control device 41 (second control device CT2) outputs the objective information together with the execution command and the target command, the rotating electric machine control device 44 that receives them executes rotation speed control according to the objective information so as to bring the rotation speed of the rotating electric machine 24 close to the target rotation speed indicated in the target command. The rotating electric machine control device 44 executes rotation speed control of the rotating electric machine 24 with control settings according to the objective information. In this embodiment, as shown in FIG. 2, a control setting suitable for each objective information (combination of a target object and an action) is associated in advance with a control setting suitable for that objective.

[0051] Continuing with the above-described example, a "responsiveness priority setting" is associated with the "generation of differential rotation" of the "transmission engagement device 25." A "responsiveness priority setting" or a "stability priority setting" is associated with the "maintenance of differential rotation" of the "transmission engagement device 25." More specifically, the "responsiveness priority setting" is associated with the "responsiveness priority setting" during cranking of the internal combustion engine EG, and the "stability priority setting" is associated with the "stability priority setting" after cranking of the internal combustion engine EG is completed. A "stability priority setting" is associated with the "convergence of differential rotation." Furthermore, a "stability priority setting" is associated with the "startup process" of the "oil pump OP." Note that the example shown in FIG. 2 is a simplified representative example for ease of understanding, and it goes without saying that other objective information and other control settings may be included.

[0052] In the example shown in FIG. 2 , when the purpose of the rotational speed control of the rotating electric machine 24 is to “generate a rotational difference” of the “transmission engagement device 25,” the rotating electric machine control device 44 executes the rotational speed control with the control setting of “response priority setting.” Furthermore, when the purpose of the rotational speed control of the rotating electric machine 24 is to “maintain a rotational difference” of the “transmission engagement device 25” and the internal combustion engine EG is cranking, the rotating electric machine control device 44 executes the rotational speed control with the control setting of “response priority setting.” Furthermore, when the purpose of the rotational speed control of the rotating electric machine 24 is to “maintain a rotational difference” of the “transmission engagement device 25,” and the internal combustion engine EG has finished cranking, the rotating electric machine control device 44 executes the rotational speed control with the control setting of “stability priority setting.” Furthermore, when the purpose of the rotational speed control of the rotating electric machine 24 is to “converge a rotational difference” of the “transmission engagement device 25,” the rotating electric machine control device 44 executes the rotational speed control with the control setting of “stability priority setting.” Furthermore, if the purpose of the rotation speed control of the rotating electrical machine 24 is the "start-up process" of the "oil pump OP," the rotating electrical machine control device 44 executes the rotation speed control with the control setting of "stability priority setting."

[0053] Specific examples of each control in the internal combustion engine start control will be described with reference to the time chart in Fig. 3. When a start request for the internal combustion engine EG is issued at time T01, the oil pressure of the transfer engagement device 25 is gradually reduced. During this time, the rotating electric machine control device 44 executes torque control of the rotating electric machine 24. When the oil pressure of the transfer engagement device 25 is reduced to a predetermined oil pressure at time T02, the integrated control device 41 outputs a command to execute rotational speed control of the rotating electric machine 24 together with a target command and objective information. The objective information here is "differential rotation generation" of the "transmission engagement device 25" to appropriately place the transfer engagement device 25 in a slip engagement state.

[0054] As described with reference to Fig. 2, the "responsiveness priority setting" is associated with the "differential rotation generation" of the "transmission engagement device 25," and therefore the rotating electric machine control device 44, upon receiving the execution command, selects the "responsiveness priority setting" and executes rotational speed control of the rotating electric machine 24 based on that setting. In this embodiment, the disturbance observer is activated while the rotational speed control of the rotating electric machine 24 is being executed. This allows the rotational speed of the rotating electric machine 24 to quickly approach the target rotational speed, and the target differential rotation of the transfer engagement device 25 to be quickly generated, thereby quickly bringing the transfer engagement device 25 into a slip engagement state.

[0055] When the target differential rotation of the transmission engagement device 25 is achieved at time T03, the integrated control device 41 newly outputs (updates) the objective information. The objective information here is "maintain differential rotation" of the "transmission engagement device 25" in order to appropriately maintain the slip engagement state of the transmission engagement device 25. Note that although the internal combustion engine EG is stopped at this point, cranking will start thereafter, and therefore the integrated control device 41 acquires information that the state of the internal combustion engine EG is "cranking."

[0056] Since the "responsiveness priority setting" is associated with the "maintenance of differential rotation (during cranking)" of the "transmission engagement device 25," the rotating electric machine control device 44, which is executing rotational speed control, continues the "responsiveness priority setting" as is, and executes rotational speed control of the rotating electric machine 24 based on that setting. The disturbance observer also continues to operate. This makes it possible to keep the rotational speed of the rotating electric machine 24 close to the target rotational speed, and to appropriately maintain the target differential rotation of the transmission engagement device 25.

[0057] This makes it possible to appropriately prevent torque fluctuations that occur when hydraulic pressure is subsequently supplied to the disengagement engagement device 22 to increase the rotational speed of the internal combustion engine EG using the torque of the rotating electric machine 24 to start the internal combustion engine EG from being transmitted to the wheels W. At this time, even if the transmission torque of the disengagement engagement device 22 fluctuates in conjunction with cranking of the internal combustion engine EG, the effect of the torque fluctuations as a disturbance can be corrected with high responsiveness, and the target differential rotation of the transfer engagement device 25 can be appropriately maintained, and the slip engagement state of the transfer engagement device 25 can be appropriately maintained.

[0058] When the cranking of the internal combustion engine EG ends at time T04, the integrated control device 41 acquires information to that effect. Since the "stability priority setting" is associated with the "maintenance of differential rotation (after cranking ends)" of the "transmission engagement device 25," the rotating electric machine control device 44, which is currently executing rotational speed control, switches from the "response priority setting" to the "stability priority setting" and executes rotational speed control of the rotating electric machine 24 based on the "stability priority setting." In this embodiment, the disturbance observer is deactivated. This makes it possible to suppress fluctuations in feedback torque, stably maintain the state in which the target differential rotation of the transmission engagement device 25 is achieved, and appropriately maintain the slip engagement state of the transmission engagement device 25.

[0059] Thereafter, at time T05, when the output torque of the internal combustion engine EG stabilizes, the transfer engagement device 25, which had been maintained in the slip engagement state, is returned to the direct engagement state again. At this time, the integrated control device 41 outputs (updates) a new target command and objective information in order to reduce the differential rotation speed of the transfer engagement device 25 and bring it into synchronous engagement. The target command here is the rotation speed of the transmission input member 26, and the objective information is the "differential rotation convergence" of the "transmission engagement device 25" in order to release the slip engagement state of the transfer engagement device 25.

[0060] Since the "stability priority setting" is associated with the "differential rotation convergence" of the "transmission engagement device 25," the rotating electric machine control device 44, which is executing rotation speed control, continues the "stability priority setting" as is and executes rotation speed control of the rotating electric machine 24 based on that setting. The disturbance observer remains inactive. This makes it possible to suppress fluctuations in feedback torque and gradually reduce the differential rotation speed of the transfer engagement device 25 so that it approaches zero smoothly. Therefore, it is possible to appropriately perform synchronous engagement of the transfer engagement device 25 at time T06 and appropriately avoid the occurrence of torque fluctuations that accompany the transition of the transfer engagement device 25 to a direct engagement state.

[0061] As described above, the vehicle drive system 1 of this embodiment: a vehicle drive device 2 in which a disengagement engagement device 22 (first engagement device CL1), a rotary electric machine 24, and a transfer engagement device 25 (second engagement device CL2) are provided in this order from the input member 21 side in a power transmission path connecting an input member 21 drivingly connected to the internal combustion engine EG and an output member 30 drivingly connected to wheels W, and an automatic transmission 27 is provided on the output member 30 side of the rotary electric machine 24 in the power transmission path; a rotating electric machine control device 44 (first control device CT1) that controls the rotating electric machine 24; A vehicle drive system 1 including an integrated control device 41 (second control device CT2) that controls at least an automatic transmission 27, The rotating electric machine control device 44 (first control device CT1) is capable of performing rotation speed control to control the rotation speed of the rotating electric machine 24 so as to approach a target rotation speed, The integrated control device 41 (second control device CT2) is capable of instructing the rotating electrical machine control device 44 (first control device CT1) to execute rotational speed control, and when instructing the rotating electrical machine control device 44 (first control device CT1) to execute rotational speed control, outputs to the rotating electrical machine control device 44 (first control device CT1) a target command indicating a target rotational speed and purpose information indicating a purpose of the rotational speed control together with the execution command for the rotational speed control; The rotating electric machine control device 44 (first control device CT1) is provided with a plurality of selectable control settings to be used for rotational speed control, and when an execution command is received, it selects one control setting from the plurality of control settings according to the target information received together with the execution command, and performs rotational speed control using the selected control setting so as to bring the rotational speed of the rotating electric machine 24 closer to the target rotational speed indicated in the target command.

[0062] According to this configuration, when the integrated control device 41 (second control device CT2) commands the rotating electric machine control device 44 (first control device CT1) to execute rotational speed control, it outputs the execution command, a target command indicating a target rotational speed, and also purpose information indicating the purpose of the rotational speed control. Then, upon receiving the purpose information along with the execution command and the target command, the rotating electric machine control device 44 (first control device CT1) selects one control setting from among multiple control settings in accordance with the purpose information and executes rotational speed control using the selected control setting. Therefore, the rotational speed control of the rotating electric machine 24 can be executed with an optimal control setting depending on the purpose of the rotational speed control. For example, by determining an optimal control setting for each purpose of rotational speed control, the rotational speed control of the rotating electric machine 24 can be executed with the optimal control setting.

[0063] In this case, The purpose information preferably includes the content of the operation to be performed using the transmission engagement device 25 (second engagement device CL2).

[0064] According to this configuration, various operations using the transmission engagement device 25 (second engagement device CL2) can be performed appropriately so as to suit the purpose.

[0065] Also, the plurality of control settings include at least a responsiveness-first setting and a stability-first setting; The response priority setting is a control setting that can bring the rotation speed of the rotating electrical machine 24 closer to the target rotation speed more quickly than the stability priority setting. The stability priority setting is preferably a control setting that can suppress fluctuations in feedback torque in the rotational speed control, compared to the response priority setting.

[0066] According to this configuration, by selecting a response-priority setting in the rotational speed control of the rotating electric machine 24, it is possible to quickly bring the rotational speed of the rotating electric machine 24 closer to the target rotational speed. On the other hand, by selecting a stability-priority setting in the rotational speed control of the rotating electric machine 24, it is possible to suppress fluctuations in the feedback torque in the rotational speed control of the rotating electric machine 24. Then, by appropriately linking various control settings, including a response-priority setting and a stability-priority setting, to each control involving the rotational speed control of the rotating electric machine 24 according to the respective purpose, it is possible to appropriately control the rotational speed of the rotating electric machine 24 according to the purpose.

[0067] Also, The rotating electrical machine control device 44 (first control device CT1) When the purpose of the rotational speed control indicated in the purpose information is to generate a differential rotation speed for initiating slip engagement of the transmission engagement device 25 (second engagement device CL2), the response priority setting is selected, When the purpose of the rotational speed control indicated in the purpose information is differential rotation convergence for ending slip engagement of the transmission engagement device 25 (second engagement device CL2), it is preferable to select the stability priority setting.

[0068] According to this configuration, when it is desired to generate differential rotation to initiate slip engagement of the transfer engagement device 25 (second engagement device CL2), selecting the responsiveness priority setting makes it possible to quickly bring the rotation speed of the rotating electric machine 24 closer to the target rotation speed and quickly generate the target differential rotation. Also, when it is desired to end the slip engagement state of the transfer engagement device 25 (second engagement device CL2) after generation of differential rotation, selecting the stability priority setting suppresses fluctuations in feedback torque in rotation speed control of the rotating electric machine 24 and makes it possible to smoothly release the slip engagement state of the transfer engagement device 25 (second engagement device CL2).

[0069] Also, The vehicle drive device 2 includes an oil pump OP drivingly connected to a rotating electric machine 24, The purpose information preferably includes the content of the operation to be performed using the oil pump OP.

[0070] According to this configuration, various operations using the oil pump OP can be performed appropriately so as to suit the purpose.

[0071] Other Embodiments (1) In the above embodiment, an example has been described in which, when the purpose of the rotational speed control of the rotating electric machine 24 is to "maintain the differential rotation" of the "transmission engagement device 25," the "response priority setting" and the "stability priority setting" are switched depending on whether the internal combustion engine EG is cranking. However, the present invention is not limited to such a configuration, and when the purpose of the rotational speed control of the rotating electric machine 24 is to "maintain the differential rotation" of the "transmission engagement device 25," the "response priority setting" may be selected across the board.

[0072] (2) In the above embodiment, the target information is the content of the operation to be performed using the transmission engagement device 25 (second engagement device CL2) or the content of the operation to be performed using the oil pump OP. However, the target information is not limited to such a configuration, and the content of the operation to be performed using other components provided in the vehicle drive system 2 (for example, "shifting gears" of the "automatic transmission 27") may be the target information.

[0073] (3) In the above embodiment, the responsiveness-priority setting and the stability-priority setting have been described as examples of the multiple control settings selectable by the rotating electric machine control device 44 (first control device CT1). However, the present invention is not limited to such a configuration, and other control settings may be selectable. For example, a medium setting that appropriately balances responsiveness and stability, or a high-precision-priority setting that can bring the rotation speed of the rotating electric machine 24 closer to the target rotation speed with higher accuracy than the responsiveness-priority setting or the stability-priority setting may be selectable.

[0074] (4) In the above embodiment, the integrated control device 41, which indirectly controls the automatic transmission 27 via the automatic transmission control device 45, is configured to be able to command the rotating electric machine control device 44 (first control device CT1) to execute rotational speed control, and the integrated control device 41 is configured as the second control device CT2. However, the present invention is not limited to such a configuration. For example, the automatic transmission control device 45 may be configured to be able to directly command the rotating electric machine control device 44 (first control device CT1) to execute rotational speed control. In such a configuration, the automatic transmission control device 45 corresponds to the "second control device CT2." In this way, when the automatic transmission control device 45 commands the rotating electric machine control device 44 to execute rotational speed control, the target command and objective information output from the automatic transmission control device 45 may be reconciled in the integrated control device 41 and then output to the rotating electric machine control device 44.

[0075] (5) In the above embodiment, the control settings for the rotational speed control of the rotating electric machine 24 that is executed in conjunction with internal combustion engine start control have been described as an example. However, the present disclosure is not limited to such a configuration, and the technology of the present disclosure can also be applied to the rotational speed control of the rotating electric machine 24 that is executed in conjunction with other controls, such as gear shift control and learning control of the response characteristics of each engagement device.

[0076] (6) In the above embodiment, an example has been described in which the vehicle drive device 2 includes the transmission engagement device 25 closer to the output member 30 than the rotating electric machine 24, and the transmission engagement device 25 is the second engagement device CL2. However, the present invention is not limited to such a configuration. The rotating electric machine 24 may be drivingly connected to the transmission input member 26 so as to rotate integrally with the transmission engagement device 26 without including the transmission engagement device 25, and one of the multiple transmission engagement devices in the automatic transmission 27 may serve as the transmission engagement device 25. In such a configuration, one of the multiple transmission engagement devices corresponds to the "second engagement device CL2."

[0077] (7) In the above embodiment, an example has been described in which the automatic transmission 27 provided in the vehicle drive system 2 is configured as a stepped automatic transmission. However, without being limited to such a configuration, the automatic transmission 27 may be configured as, for example, a continuously variable automatic transmission.

[0078] (8) The configurations disclosed in the above-described embodiments (including the above-described embodiments and other embodiments; the same applies hereinafter) can be applied in combination with configurations disclosed in other embodiments, as long as no contradiction occurs. Regarding other configurations, the embodiments disclosed in this specification are illustrative in all respects and can be appropriately modified within the scope of the present disclosure. [Explanation of symbols]

[0079] 1: vehicle drive system, 2: vehicle drive device, 21: input member, 22: disengagement engagement device, 23: intermediate member, 24: rotating electric machine, 25: transmission engagement device, 26: transmission input member, 27: automatic transmission, 28: transmission output member, 29: differential gear device, 30: output member, 41: integrated control device, 42: internal combustion engine control device, 43: clutch control device, 44: rotating electric machine control device, 45: automatic transmission control device, CL1: first engagement device, CL2: second engagement device, CT1: first control device, CT2: second control device, EG: internal combustion engine, OP: oil pump, W: wheel

Claims

1. a vehicle drive device in which a first engagement device, a rotary electric machine, and a second engagement device are provided in this order from the input member side in a power transmission path that connects an input member that is drivingly connected to an internal combustion engine and an output member that is drivingly connected to a wheel, and an automatic transmission is provided on the output member side of the rotary electric machine in the power transmission path; a first control device that controls the rotating electric machine; A vehicle drive system including: a second control device that controls at least the automatic transmission; the first control device is capable of executing rotational speed control to control the rotational speed of the rotating electrical machine so as to approach a target rotational speed, the second control device is capable of instructing the first control device to execute the rotational speed control, and when instructing the first control device to execute the rotational speed control, outputs to the first control device, together with the execution command for the rotational speed control, a target command indicating the target rotational speed and target information indicating a purpose of the rotational speed control by a combination of a target object and a target action; the first control device is provided with a plurality of selectable control settings for control characteristics when executing the rotational speed control, and when receiving the execution command, selects one of the plurality of control settings in accordance with a combination of the target object and the target action that constitute the target information received along with the execution command, and executes the rotational speed control using the selected control setting so as to bring the rotational speed of the rotating electric machine closer to the target rotational speed indicated in the target command.

2. The vehicle drive system according to claim 1 , wherein the target information includes details of an operation to be performed using the second engagement device as the target object.

3. the plurality of control settings include at least a responsiveness-priority setting and a stability-priority setting; the response-priority setting is a control setting that can bring the rotation speed of the rotating electric machine closer to the target rotation speed more quickly than the stability-priority setting, 3. The vehicle drive system according to claim 1, wherein the stability-priority setting is a control setting that can suppress fluctuations in feedback torque in the rotational speed control, compared to the response-priority setting.

4. The first control device When the purpose of the rotational speed control indicated in the purpose information is to generate a differential rotation speed for initiating slip engagement of the second engagement device, the response priority setting is selected, The vehicle drive system according to claim 3 , wherein the stability priority setting is selected when the purpose of the rotational speed control indicated in the purpose information is differential rotation convergence for ending slip engagement of the second engagement device.

5. the vehicle drive device includes an oil pump drivingly connected to the rotating electric machine, The vehicle drive system according to claim 1 , wherein the target information includes details of an operation to be performed using the oil pump as the target object.

6. a vehicle drive device in which a first engagement device, a rotary electric machine, and a second engagement device are provided in this order from the input member side in a power transmission path that connects an input member that is drivingly connected to an internal combustion engine and an output member that is drivingly connected to a wheel, and an automatic transmission is provided on the output member side of the rotary electric machine in the power transmission path; a first control device that controls the rotating electric machine; A vehicle drive system including: a second control device that controls at least the automatic transmission; the first control device is capable of executing rotational speed control to control the rotational speed of the rotating electrical machine so as to approach a target rotational speed, the second control device is capable of instructing the first control device to execute the rotational speed control, and when instructing the first control device to execute the rotational speed control, outputs to the first control device, together with the execution command for the rotational speed control, a target command indicating the target rotational speed and purpose information indicating a purpose of the rotational speed control; the first control device is provided with a plurality of selectable control settings to be used for the rotational speed control, and when receiving the execution command, selects one of the plurality of control settings in accordance with the objective information received together with the execution command, and executes the rotational speed control using the selected control setting so as to bring the rotational speed of the rotating electric machine closer to the target rotational speed indicated in the target command; the plurality of control settings include at least a responsiveness-priority setting and a stability-priority setting; the response-priority setting is a control setting that can bring the rotation speed of the rotating electric machine closer to the target rotation speed more quickly than the stability-priority setting, the stability-priority setting is a control setting that can suppress fluctuations in feedback torque in the rotational speed control compared to the responsiveness-priority setting, The first control device When the purpose of the rotational speed control indicated in the purpose information is to generate a differential rotation speed for initiating slip engagement of the second engagement device, the response priority setting is selected, A vehicle drive system that selects the stability-priority setting when the purpose of the rotational speed control indicated in the purpose information is differential rotation convergence for ending slip engagement of the second engagement device.

7. a vehicle drive device in which a first engagement device, a rotary electric machine, and a second engagement device are provided in this order from the input member side in a power transmission path that connects an input member that is drivingly connected to an internal combustion engine and an output member that is drivingly connected to a wheel, and an automatic transmission is provided on the output member side of the rotary electric machine in the power transmission path; a first control device that controls the rotating electric machine; A vehicle drive system including: a second control device that controls at least the automatic transmission; the first control device is capable of executing rotational speed control to control the rotational speed of the rotating electrical machine so as to approach a target rotational speed, the second control device is capable of instructing the first control device to execute the rotational speed control, and when instructing the first control device to execute the rotational speed control, outputs to the first control device, together with the execution command for the rotational speed control, a target command indicating the target rotational speed and purpose information indicating a purpose of the rotational speed control; the first control device is provided with a plurality of selectable control settings to be used for the rotational speed control, and when receiving the execution command, selects one of the plurality of control settings in accordance with the objective information received together with the execution command, and executes the rotational speed control using the selected control setting so as to bring the rotational speed of the rotating electric machine closer to the target rotational speed indicated in the target command; the vehicle drive device includes an oil pump drivingly connected to the rotating electric machine, The purpose information includes details of an operation to be performed using the oil pump.

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