JP7822232B2 - Vehicle Drive System - Google Patents

Description

The present invention relates to a vehicle drive system.

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 (note that the second engagement device may also be provided within the automatic transmission; the same applies below) are provided in the power transmission path connecting the internal combustion engine and the wheels. An example of such a vehicle drive system is disclosed in Japanese Patent Application Laid-Open No. 2018-39317 (Patent Document 1).

The system of Patent Document 1 includes a vehicle drive system (parallel hybrid drivetrain) 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.

In the system of Patent Document 1, after the internal combustion engine has been started, the system performs internal combustion engine startup control by reducing the target rotational speed of the rotating electric machine toward the slip convergence rotational speed of the second engagement device while maintaining control that sets the transmission torque capacity of the second engagement device equivalent to the vehicle's required torque. In this case, the first control device is configured to switch the control settings (first motor rotational speed control law/second motor rotational speed control law) for controlling the rotational speed of the rotating electric machine based on the magnitude relationship between the differential rotational speed (slip rotational speed) of the second engagement device and a predetermined threshold value (predetermined value).

However, there have been cases where the rotational speed control of a rotating electric machine is not necessarily performed at the optimal control settings 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 settings for rotational speed control of a rotating electric machine may change depending on the purpose, but there have been cases where the control is performed at control settings that are not optimal given 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.

JP 2018-39317 A

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 the power transmission path connecting the internal combustion engine and the wheels, it is desirable to be able to control the rotational speed of the rotating electric machine with optimal control settings.

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 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 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.

With 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 the target rotational speed, and also output purpose information indicating the purpose of the rotational speed control. The first control device then receives the purpose information along with the execution command and target command, selects one control setting from multiple control settings in accordance with the purpose information, and executes rotational speed control using the selected control setting. This allows 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.

Further features and advantages of the technology disclosed herein will become more apparent from the following description of exemplary, non-limiting embodiments, which proceeds with reference to the drawings.

Schematic diagram of vehicle drive system FIG. 10 is a diagram showing an example of association between purpose information and control settings. Time chart of internal combustion engine start control

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 is equipped with 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.

In the following description, "driving connection" refers to a state in which two rotating elements are connected so that they can transmit a driving force (synonymous with torque). This concept includes a state in which two rotating elements are connected so that they rotate as a single unit, and a state in which they are connected so that a driving force can be transmitted via one or more transmission members. Such transmission members include various components (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.

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.

As shown in FIG. 1, the vehicle drive system 2 includes a power transmission path connecting an input member 21, which is drivingly connected to the internal combustion engine EG, and an output member 30, which is drivingly connected to the wheels W. The power transmission path connects the input member 21, which is drivingly connected to the internal combustion engine EG, and the output member 30. The power transmission path also includes an 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 rotating 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 that is drivingly connected to the rotating electric machine 24.

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

The intermediate member 23 is drivingly connected to the rotating electric machine 24. The intermediate member 23 is configured, for example, as 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, the 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, or may be connected via another member. In addition, an oil pump OP is drivingly connected to the intermediate member 23.

The disengagement engagement device 22 selectively connects the input member 21 and the intermediate member 23. In other words, the disengagement 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 disengagement engagement device 22, and more specifically, a wet multi-plate clutch, for example, can be used. In this embodiment, the disengagement engagement device 22 corresponds to the "first engagement device CL1."

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 the intermediate member 23 so as to rotate integrally with it. The intermediate member 23 is drivingly connected to the transmission input member 26 via a transmission engagement device 25. The transmission input member 26 is an input member of the automatic transmission 27. The transmission input member 26 is formed, for example, by a shaft member (transmission input shaft).

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, the transmission engagement device 25 can be a hydraulically driven friction engagement device, and more specifically, a wet multi-plate clutch, for example. In this embodiment, the transmission engagement device 25 corresponds to the "second engagement device CL2."

The automatic transmission 27 changes the rotational speed of the transmission input member 26 and transmits it to the transmission output member 28. In this embodiment, the automatic transmission 27 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). The transmission engagement device can be a hydraulically driven friction engagement device, similar to the disengagement engagement device 22 and the transmission engagement device 25; specifically, a wet multi-plate clutch, for example, can be used.

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 that they rotate together. The slip engagement state is a state in which the rotating members on both sides of each engagement device are engaged so that torque is transmitted while there is a differential rotation. These direct engagement state and slip engagement state are sometimes referred to as the engaged 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.

The automatic transmission 27 can selectively establish one of a number of gears depending on the engagement state of each of the gear shift engagement devices. The automatic transmission 27 then shifts the rotational speed of the transmission input member 26 based on a gear ratio corresponding to the established gear, and transmits the rotational speed to the transmission output member 28. The "gear ratio" is the ratio of the rotational speed of the transmission input member 26 to the rotational speed of the transmission output member 28, and is calculated as the value obtained by dividing the rotational speed of the transmission input member 26 by the rotational speed of the transmission output member 28. The transmission output member 28 is formed, for example, by a shaft member (transmission output shaft).

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. As a result, the vehicle drive system 2 can 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.

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, which is then supplied 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.

As shown in FIG. 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 with software (programs) stored in a storage medium such as a memory, or with separately provided hardware such as an arithmetic circuit, or both. Each functional part is configured to be able to exchange information with each other.

The control system is also configured to acquire information on the detection results of various sensors provided in various parts of the vehicle on which the vehicle drive device 2 is installed. 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. Sensors may also include sensors that detect the accelerator opening, brake operation amount, the amount of electricity stored in the electricity storage device, etc.

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, and the automatic transmission 27 (shift engagement device) for the entire vehicle. The integrated control device 41 controls the internal combustion engine EG via the internal combustion engine control device 42, controls the engagement state of the disengagement engagement device 22 and the transfer engagement device 25 via the clutch control device 43, and controls the rotating electric machine 24 via the rotating electric machine control device 44. The integrated control device 41 also controls the automatic transmission 27 (the engagement state of the shift engagement device) via the automatic transmission control device 45. In this embodiment, the integrated control device 41, which controls the automatic transmission 27 via the automatic transmission control device 45, corresponds to the "second control device CT2."

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 the amount of electricity stored in the power storage device). The driving modes that the integrated control device 41 can select include electric driving mode and hybrid driving mode.

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 disengaged and the transfer engagement device 25 (second engagement device CL2) is engaged. The hybrid driving mode is realized when both the disengagement engagement device 22 (first engagement device CL1) and the transfer engagement device 25 (second engagement device CL2) are engaged. 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 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 electrical machine control device 44 to execute rotational speed control.

The internal combustion engine control device 42 controls the internal combustion engine EG. Based on commands from the integrated control device 41, for example, the internal combustion engine control device 42 can switch between torque control and rotational speed control of the internal combustion engine EG depending on the vehicle's running state. 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 that target torque. 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 that target rotational speed.

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 transfer engagement device 25, which is the second engagement device CL2. The clutch control device 43 controls the engagement state of each engagement device to achieve the driving mode determined by the integrated control device 41. The clutch control device 43 also controls the oil pressure (and therefore the transmission torque capacity) supplied to each engagement device during mode transitions so that it changes 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.

The rotating electric machine control device 44 controls the rotating electric machine 24. The rotating electric machine control device 44 can perform torque control and rotational speed control of the rotating electric machine 24 according to the vehicle's running state, for example, based on commands 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 causes the output torque of the rotating electric machine 24 to 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 perform 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."

In this embodiment, the rotating electric machine control device 44 is provided with a plurality of selectable control settings for use in controlling the rotational speed of the rotating electric machine 24. Here, a control setting refers to a setting that defines detailed control characteristics for rotational speed control. In this embodiment, the plurality of selectable control settings by the rotating electric machine control device 44 includes at least a response-priority setting and a stability-priority setting.

The responsiveness priority setting is a control setting that prioritizes responsiveness in rotational speed control. In other words, 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 the feedback gain (PID control gain) in the 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 while the rotational speed feedback control of the rotating electric machine 24 is being executed. Here, the disturbance observer is a controller that estimates the torque (disturbance torque) that prevents the rotational speed of the rotating electric machine 24 from following the target, and adds a torque that cancels out this estimated disturbance torque to the feedback torque in the rotational speed feedback control. A disturbance observer with general specifications can be used as appropriate.

In particular, when the disturbance observer is activated with a response priority setting, it is preferable because it has high disturbance resistance and can correct disturbances with high responsiveness, resulting in high tracking ability of the rotational speed of the rotating electric machine 24.

The stability priority setting is a control setting that prioritizes stability in rotational speed control. In other words, 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 (PID control gain) in 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 while rotational speed feedback control of the rotating electric machine 24 is being executed. The disturbance observer is as described above.

When controlling the rotational speed of the rotating electric machine 24, the rotating electric machine control device 44 selects one control setting from among multiple control settings and performs rotational speed control using the selected control setting. In this embodiment, the rotating electric machine control device 44 performs rotational speed control by selectively using either a responsiveness-priority setting or a stability-priority setting. The method for selecting the control setting will be described later.

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 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.

The following describes a method for selecting control settings for controlling the rotational speed of the rotating electric machine 24, using internal combustion engine startup control as an example.

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 the disengagement engagement device 22 is placed 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 using the torque of the rotating electric machine 24. The reason the transfer engagement device 25 is placed 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.

The rotational speed control of the rotating electric machine 24 is performed to increase the rotational speed of the rotating electric machine 24 and ensure that each engagement device 22, 25 is in a slip engagement state. In particular, with respect to the engagement state of the transfer engagement device 25, in order to change from the previous direct engagement state to a slip engagement state, the rotational speed control of the rotating electric machine 24 increases the differential rotational speed from zero to a predetermined speed. 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").

Furthermore, after the differential rotational speed reaches a predetermined speed, the differential rotational 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 controlling the rotational speed of the rotating electric machine 24 is to maintain the differential rotational speed of the transfer engagement device 25 that has reached a predetermined speed (hereinafter referred to as "maintaining differential rotation").

Furthermore, once the output torque of the internal combustion engine EG has stabilized after starting, 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, 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 starting the internal combustion engine EG, toward zero (hereinafter referred to as "differential rotation convergence").

As such, even when taking the rotational speed control of the rotating electric machine 24 associated with internal combustion engine startup control as a single 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.

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 the target rotational speed is output along with the 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).

As shown in FIG. 2, the target information is composed of a combination of the target object and the target action. As explained above, the rotational speed control of the rotating electric machine 24 associated with the internal combustion engine start control may be performed for the purposes 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 composed of a combination of these.

In addition, as another example, control of the rotational speed of the rotating electric machine 24 may also be performed for the purpose of pre-filling the oil pump OP and the oil passages extending from it with oil that has leaked out due to a long period of vehicle stoppage. 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 the "start-up process" which represents pre-filling in accordance with a predetermined startup sequence, and the combination of these constitutes part of the target information.

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

When the integrated control device 41 (second control device CT2) outputs the objective information along with the execution command and the target command, the rotating electric machine control device 44 that receives them performs rotational speed control according to the objective information so that the rotational speed of the rotating electric machine 24 approaches the target rotational speed indicated in the target command. The rotating electric machine control device 44 performs rotational speed control of the rotating electric machine 24 with control settings according to the objective information. In this embodiment, as shown in FIG. 2, control settings appropriate for each objective information (combination of target object and action) are pre-associated.

Continuing with the example above, 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, a "responsiveness priority setting" is associated with the cranking of the internal combustion engine EG, and a "stability priority setting" is associated with the completion of cranking of the internal combustion engine EG. A "stability priority setting" is associated with "convergence of differential rotation." Furthermore, a "stability priority setting" is associated with the "startup process" of the "oil pump OP." Note that Figure 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.

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 controlling the rotational speed of the rotating electrical machine 24 is to "start up" the "oil pump OP," the rotating electrical machine control device 44 executes rotational speed control with a "stability priority setting" control setting.

Specific examples of each control in the internal combustion engine start control will be explained with reference to the time chart in Figure 3. When a request to start the internal combustion engine EG is issued at time T01, the oil pressure of the transfer engagement device 25 gradually decreases. 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 decreases 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, along with a target command and objective information. The objective information here is "differential rotation generation" of the transfer engagement device 25 to appropriately place the transfer engagement device 25 in a slip engagement state.

As explained with reference to FIG. 2, the "responsiveness priority setting" is associated with the "differential rotation generation" of the "transmission engagement device 25." Therefore, upon receiving the execution command, the rotating electric machine control device 44 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 can be quickly generated, quickly placing the transfer engagement device 25 in a slip engagement state.

When the target differential rotation of the transmission engagement device 25 is achieved at time T03, the integrated control device 41 outputs new (updated) objective information. The objective information here is "maintain differential rotation" of the "transmission engagement device 25" in order to properly 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 begin thereafter, so the integrated control device 41 acquires information that the state of the internal combustion engine EG is "cranking."

Since the "responsiveness priority setting" is associated with the "maintain differential rotation (during cranking)" setting of the "transmission engagement device 25," the rotating electric machine control device 44, which is currently executing rotational speed control, continues the "responsiveness priority setting" and controls the rotational speed of the rotating electric machine 24 based on that setting. The disturbance observer also continues to operate. This allows the rotational speed of the rotating electric machine 24 to be kept close to the target rotational speed, and the target differential rotation of the transmission engagement device 25 can be appropriately maintained.

This effectively prevents torque fluctuations that occur when hydraulic pressure is supplied to the disengagement engagement device 22 and the rotational speed of the internal combustion engine EG is increased by the torque of the rotating electric machine 24 to start the internal combustion engine EG from being transmitted to the wheels W. Even if the transmission torque of the disengagement engagement device 22 fluctuates as the internal combustion engine EG is cranked, the effect of the torque fluctuations acting as a disturbance can be responsively corrected, appropriately maintaining the target differential rotation of the transmission engagement device 25 and appropriately maintaining the slip engagement state of the transmission engagement device 25.

When 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 this setting. In this embodiment, the disturbance observer is deactivated. This suppresses fluctuations in feedback torque, allowing the state in which the target differential rotation of the transmission engagement device 25 is achieved to be stably maintained, and the slip engagement state of the transmission engagement device 25 to be appropriately maintained.

After that, 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. 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.

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 currently executing rotational speed control, continues the "stability priority setting" as is and executes rotational 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 rotational speed of the transfer engagement device 25, allowing it to smoothly approach zero. Therefore, synchronous engagement of the transfer engagement device 25 can be properly performed at time T06, and torque fluctuations associated with the transition of the transfer engagement device 25 to a direct engagement state can be properly avoided.

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 on a power transmission path connecting an input member 21 drivably connected to an internal combustion engine EG and an output member 30 drivably connected to a wheel 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 electric machine control device 44 (first control device CT1) to execute rotational speed control, and when instructing the rotating electric machine control device 44 (first control device CT1) to execute rotational speed control, outputs to the rotating electric 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) has a plurality of selectable control settings to be used for rotational speed control, and when it receives an execution command, it selects one control setting from the plurality of control settings according to the target information received along 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.

With 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 the 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 target command, the rotating electric machine control device 44 (first control device CT1) selects one control setting from 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 the optimal control setting depending on the purpose of the rotational speed control. For example, by determining the 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.

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).

This configuration allows various operations using the transmission engagement device 25 (second engagement device CL2) to be performed appropriately to suit their purpose.

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.

With this configuration, by selecting a responsiveness-priority setting in the rotational speed control of the rotating electric machine 24, the rotational speed of the rotating electric machine 24 can be brought closer to the target rotational speed quickly. On the other hand, by selecting a stability-priority setting in the rotational speed control of the rotating electric machine 24, fluctuations in feedback torque in the rotational speed control of the rotating electric machine 24 can be suppressed. Furthermore, by appropriately linking various control settings, including a responsiveness-priority setting and a stability-priority setting, to each control involving the rotational speed control of the rotating electric machine 24 according to its respective purpose, the rotational speed control of the rotating electric machine 24 can be performed appropriately according to its purpose.

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.

With this configuration, when it is desired to generate a differential rotation to initiate slip engagement of the transfer engagement device 25 (second engagement device CL2), selecting the responsiveness priority setting allows the rotational speed of the rotating electric machine 24 to quickly approach the target rotational speed, thereby quickly generating the target differential rotation. Furthermore, for example, when it is desired to end the slip engagement state of the transfer engagement device 25 (second engagement device CL2) after generating a differential rotation, selecting the stability priority setting suppresses fluctuations in feedback torque in rotational speed control of the rotating electric machine 24, allowing the slip engagement state of the transfer engagement device 25 (second engagement device CL2) to be smoothly released.

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.

This configuration allows various operations using the oil pump OP to be performed appropriately to suit their purpose.

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.

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

(3) In the above embodiment, the responsiveness-priority setting and the stability-priority setting were described as examples of multiple control settings that can be selected 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 moderate setting that strikes an appropriate balance between 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 greater accuracy than the responsiveness-priority setting or the stability-priority setting may be selectable.

(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 instruct the rotating electric machine control device 44 (first control device CT1) to perform 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 instruct the rotating electric machine control device 44 (first control device CT1) to perform 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 instructs the rotating electric machine control device 44 to perform 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 before being output to the rotating electric machine control device 44.

(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 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.

(6) In the above embodiment, an example has been described in which the vehicle drive system 2 is provided with a 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. It is also possible to have a configuration in which the transmission engagement device 25 is not provided, the rotating electric machine 24 is drivingly connected to the transmission input member 26 so as to rotate integrally with it, and one of the multiple transmission engagement devices in the automatic transmission 27 serves as the transmission engagement device 25. In such a configuration, one of the multiple transmission engagement devices corresponds to the "second engagement device CL2."

(7) In the above embodiment, an example was described in which the automatic transmission 27 provided in the vehicle drive device 2 was configured as a stepped automatic transmission. However, without being limited to such a configuration, the automatic transmission 27 may also be configured as, for example, a continuously variable automatic transmission.

(8) The configurations disclosed in each of the above-described embodiments (including the above-described embodiments and other embodiments; the same applies hereinafter) can also be applied in combination with configurations disclosed in other embodiments, provided that no contradictions arise. Regarding other configurations, the embodiments disclosed in this specification are illustrative in all respects and can be modified as appropriate within the scope of the present disclosure.

1: Vehicle drive system, 2: Vehicle drive device, 21: Input member, 22: Disconnection 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 (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 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. 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 . 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. 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. 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 . 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. 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 .