JP2023150002A - vehicle drive system - Google Patents

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

The present invention relates to vehicle drive systems.

The power transmission path connecting the internal combustion engine and the wheels includes a first engagement device, a rotating electric machine, a second engagement device, and an automatic transmission (*The second engagement device may be included in the automatic transmission; below) A vehicle drive system is used to drive a vehicle equipped with a similar device. An example of such a vehicle drive system is disclosed in Japanese Unexamined Patent Publication No. 2018-39317 (Patent Document 1).

The system of Patent Document 1 includes a first engagement device (first clutch 2), a rotating electric machine (drive motor 3), and a first engagement device (first clutch 2), a rotating electric machine (drive motor 3), and a first engagement device (first clutch 2) in a power transmission path connecting an internal combustion engine (engine 1) and wheels (drive wheels 23). A vehicle drive system (parallel hybrid drive system) provided with two engagement devices (second clutch 4) and an automatic transmission (transmission 5), and a first control device (motor controller 19) that controls a 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, in internal combustion engine start control, after the start of the internal combustion engine is completed, the target rotational speed of the rotating electrical machine is set while maintaining control to make the transmission torque capacity of the second engagement device equal to the vehicle required torque. Control is performed to reduce the rotational speed of the second engagement device toward the slip convergence rotational speed. At this time, the first control device performs control for controlling the rotational speed of the rotating electrical 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). It is configured to switch settings (first motor rotation speed control law/second motor rotation speed control law).

However, the rotational speed control of the rotating electric machine may not necessarily be executed at the optimal control setting only based on the magnitude relationship between the differential rotational speed of the second engagement device and the threshold value. For example, when controlling the rotational speed of a rotating electric machine, the optimal control setting may change depending on the purpose, but if the rotational speed is In some cases, control settings were not optimal from the viewpoint of the purpose of control.

JP 2018-39317 Publication

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, the rotation of the rotating electric machine is It is desirable to be able to perform speed control with optimal control settings.

The vehicle drive system according to the present disclosure includes:
A first engagement device, a rotating electrical machine, and a second engagement device are provided in order from the input member side in a power transmission path connecting an input member drivingly connected to the internal combustion engine and an output member drivingly connected to the wheels. and an automatic transmission is provided closer to the output member than the rotating electric machine in the power transmission path;
a first control device that controls the rotating electric machine;
A vehicle drive system comprising at least a second control device that controls the automatic transmission,
The first control device is capable of executing rotational speed control to control the rotational speed of the rotating electric machine to approach a target rotational speed,
The second control device can instruct the first control device to execute the rotation speed control, and when instructing the first control device to execute the rotation speed control, the second control device can instruct the first control device to execute the rotation speed control. outputting a target command indicating the target rotational speed and purpose information indicating the purpose of the rotational speed control to the first control device together with an execution command;
The first control device is capable of selecting a plurality of control settings used for the rotational speed control, and when receiving the execution command, selects the plurality of control settings according to the purpose information received together with the execution command. Select one of the control settings from among the above, and use the selected control setting to execute the rotational speed control so that the rotational speed of the rotating electric machine approaches the target rotational speed indicated in the target command. .

According to this configuration, when the second control device instructs the first control device to execute the rotation speed control, in addition to the execution command and the target command indicating the target rotation speed, the second control device also sends the purpose information indicating the purpose of the rotation speed control. Output. The first control device, which has received the purpose information together with the execution command and the target command, selects one control setting from among the plurality of control settings according to the purpose information, and controls the rotation speed using the selected control setting. Execute. Therefore, the rotational speed control of the rotating electric machine can be performed with optimal control settings depending on the purpose of rotational speed control.

Further features and advantages of the technology according to the present disclosure will become clearer from the following description of illustrative and non-limiting embodiments, written with reference to the drawings.

Schematic diagram of vehicle drive system Diagram showing an example of correspondence between purpose information and control settings Internal combustion engine start control time chart

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) that includes both an internal combustion engine EG and a rotating electric machine 24. The vehicle drive system 1 of the present embodiment is a vehicle drive system that is drive-coupled to an internal combustion engine EG as a first drive power source for the wheels W and includes a rotating electric machine 24 as a second drive power source for the wheels W. It includes a device 2 and a control system that controls each part of the vehicle drive device 2.

In the following description, "drive connection" means a state in which two rotating elements are connected so that driving force (synonymous with torque) can be transmitted. This concept includes a state where two rotating elements are connected so that they rotate together, and a state where two rotating elements are connected so that driving force can be transmitted 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 engagement devices (frictional (an engagement device, a meshing engagement device, etc.) may also be included.

Furthermore, the term "rotating electric machine" is used as a concept that includes a motor (electric motor), a generator (generator), and, if necessary, a motor/generator that functions as both a motor and a generator.

As shown in FIG. 1, the vehicle drive device 2 includes a disconnection engagement device 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 the wheels W. 22, a rotating electric machine 24, a transmission engagement device 25, an automatic transmission 27, and a differential gear device 29. In addition, the vehicle drive device 2 includes an input member 21, an intermediate member 23, a speed change input member 26, a speed change output member 28, and an output member 30 in order to transmit rotation and driving force between each component in the power transmission path. It is equipped with Input member 21, disconnection engagement device 22, rotating electric machine 24 and intermediate member 23, transmission engagement device 25, speed change input member 26, automatic transmission 27, speed change output member 28, differential gear device 29, and output member 30 are provided in the order listed from the internal combustion engine EG (input member 21) side in the power transmission path. The vehicle drive device 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 (gasoline engine, diesel engine, etc.) that is driven by combustion of fuel within 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 an internal combustion engine output member (such as a crankshaft) that is an output member of the internal combustion engine EG so as to rotate integrally therewith. The input member 21 and the internal combustion engine output member may be connected directly 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 disconnection engagement device 22 .

The intermediate member 23 is drivingly connected to a rotating electric machine 24 . The intermediate member 23 is composed of, for example, a shaft member (intermediate shaft). The intermediate member 23 is drivingly connected to the rotor of the rotating electrical machine 24 and the rotating electrical machine output member (rotor shaft, etc.) that is its output member so as to rotate integrally therewith. The intermediate member 23 and the rotating electrical machine 24 may be connected directly or may be connected via another member. Further, an oil pump OP is drivingly connected to the intermediate member 23.

The disconnection engagement device 22 selectively connects the input member 21 and the intermediate member 23 . In other words, the disconnection engagement device 22 can disconnect the internal combustion engine EG and the rotating electric machine 24. As the disconnection engagement device 22, a hydraulically driven friction engagement device can be used, and specifically, for example, a wet multi-disc clutch or the like can be used. In this embodiment, the separation 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 electrical machine 24 receives power from a power storage device (not shown) and runs, or supplies power generated by the driving force of the internal combustion engine EG, inertia of the vehicle, etc. to the power storage device to store the power. The rotor of the rotating electric machine 24 is drivingly connected to the intermediate member 23 so as to rotate together with the intermediate member 23 . The intermediate member 23 is drivingly connected to a speed change input member 26 via a transmission engagement device 25 . Note that the speed change input member 26 is an input member of the automatic transmission 27. The speed change input member 26 is composed of, for example, a shaft member (speed change input shaft).

The transmission engagement device 25 selectively connects the intermediate member 23 and the speed change 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 the transmission engagement device 25, a hydraulically driven friction engagement device can be used like the disconnection engagement device 22, and specifically, for example, a wet multi-disc clutch or the like can be used. 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 speed change input member 26 and transmits the same to the speed change 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 shift engagement device (including a clutch and a brake). As the gear shifting 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-disc clutch or the like can be used. be able to.

Note that the disconnection 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 in a direct engagement state and a slip engagement state, respectively. It is possible to switch between the state and the 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 together. 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 a differential rotation. The direct engagement state and the slip engagement state may be collectively referred to as the engaged state. The released 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 form any one of a plurality of gear stages depending on the engagement state of each of the shift engagement devices. Then, the automatic transmission 27 changes the rotational speed of the speed change input member 26 based on a speed change ratio corresponding to the formed gear stage, and transmits the speed change to the speed change output member 28. Note that the "gear ratio" is the ratio of the rotation speed of the shift input member 26 to the rotation speed of the shift output member 28, and is calculated as the value obtained by dividing the rotation speed of the shift input member 26 by the rotation speed of the shift output member 28. Ru. The speed change output member 28 is composed of, for example, a shaft member (speed change output shaft).

The speed change output member 28 is drivingly connected to a pair of left and right output members 30 (for example, a shaft member (output shaft)) via a differential gear device 29, and is further drivingly connected to a pair of left and right wheels W. Thereby, the vehicle drive device 2 can transmit the driving force of at least one of the internal combustion engine EG and the rotary electric machine 24 to the wheels W to drive the vehicle.

As mentioned above, the oil pump OP is drivingly connected to the intermediate member 23. The oil pump OP is driven by a rotary electric machine 24 that rotates integrally with the intermediate member 23 to discharge oil, and the discharged oil is transmitted to the automatic transmission 27 (shift lever) via a hydraulic control device (not shown). supply to the equipment). Further, the oil pump OP supplies the discharged oil to the disconnection engagement device 22 and the transmission engagement device 25 via the hydraulic control device.

As shown in FIG. 1, 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 A transmission control device 45 is provided. Each of these control devices is configured by software (program) stored in a storage medium such as a memory, hardware such as a separately provided arithmetic circuit, or both. Each functional unit is configured to be able to exchange information with each other.

Further, the control system is configured to be able to acquire information on detection results of various sensors provided in various parts of the vehicle in which the vehicle drive device 2 is mounted. Examples of such sensors include, for example, 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, and a sensor that detects the rotational speed of the intermediate member 23 and the rotating electric machine 24 that rotates integrally with it, and the speed change input member 26. Examples include a sensor that detects the rotational speed of the shift output member 28, and a sensor that detects the rotational speed of the speed change output member 28. Further, the sensor may include a sensor that detects the accelerator opening, the amount of brake operation, the amount of electricity stored in the electricity storage device, and the like.

The integrated control device 41 performs various controls ( Performs control that integrates torque control, rotational speed control, engagement control, etc. 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 disconnection engagement device 22 and the transmission engagement device 25 via the clutch control device 43, The rotating electrical machine 24 is controlled via the rotating electrical machine control device 44. Further, the integrated control device 41 controls the automatic transmission 27 (the engagement state of the gear shift engagement device) via the 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."

The integrated control device 41 calculates a vehicle required torque required for driving the vehicle based on sensor detection information (mainly information on accelerator opening and vehicle speed). Further, the integrated control device 41 determines the driving mode based on sensor detection information (mainly information on the accelerator opening, vehicle speed, and amount of power stored in the power storage device). The driving modes that can be selected by the integrated control device 41 include an electric driving mode and a hybrid driving mode.

The electric driving mode is a driving mode in which only the driving force of the rotating electric machine 24 is transmitted to the wheels W to cause the vehicle to travel. The electric drive mode is realized with the disconnection engagement device 22 (first engagement device CL1) in a released state and the transmission engagement device 25 (second engagement device CL2) in an engaged state. The hybrid driving mode is realized when both the disconnection engagement device 22 (first engagement device CL1) and the transmission engagement device 25 (second engagement device CL2) are engaged. Switching between the electric drive mode and the hybrid drive mode can be performed by switching the engagement state of the disconnection engagement device 22 (first engagement device CL1). The integrated control device 41 executes internal combustion engine starting control, for example, when transitioning from electric drive mode to hybrid drive mode. At this time, the integrated control device 41 outputs various control commands associated with execution of internal combustion engine starting control. As an example, the integrated control device 41 (second control device CT2) of the present embodiment puts each of the engagement devices 22 and 25 into a slip engagement state with respect to the clutch control device 43 when executing internal combustion engine starting control. It instructs the execution of the control, and also instructs the rotating electric machine control device 44 to execute the rotation speed control.

Internal combustion engine control device 42 controls internal combustion engine EG. 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 driving state of the vehicle, for example, based on a command from the integrated control device 41. Torque control of the internal combustion engine EG is a control in which a target torque is commanded to the internal combustion engine EG, and the output torque of the internal combustion engine EG is made to follow the target torque. The rotational speed control of the internal combustion engine EG is a control in which a target rotational speed is commanded to the internal combustion engine EG, and an output torque is determined so that the rotational speed of the internal combustion engine EG follows the target rotational speed.

The clutch control device 43 controls the engagement state of the disconnection 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 realize the driving mode determined by the integrated control device 41. Further, the clutch control device 43 controls the oil pressure (and thus the transmission torque capacity) supplied to each engagement device to change in a predetermined manner during mode transition. The clutch control device 43 regulates the hydraulic pressure of hydraulic oil supplied from the oil pump OP using a hydraulic control device (not shown), and supplies the pressure-regulated hydraulic oil to each engagement device.

The rotating electrical machine control device 44 controls the rotating electrical 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 running state of the vehicle, for example, based on commands from the integrated control device 41. Torque control of the rotating electrical machine 24 is control in which a target torque is commanded to the rotating electrical machine 24 and the output torque of the rotating electrical machine 24 follows the target torque. The rotational speed control of the rotating electric machine 24 is a control in which a target rotational speed is commanded to the rotating electric machine 24 and an output torque is determined so that the rotational speed of the rotating electric machine 24 follows the target rotational speed. Note that it is also possible to perform torque control and rotational speed control of the rotating electrical machine 24 at the same time. In this embodiment, the rotating electric machine control device 44 corresponds to the "first control device CT1."

In the present embodiment, the rotating electric machine control device 44 is equipped with a control setting that can be selected from a plurality of control settings for use in controlling the rotational speed of the rotating electric machine 24. Here, the control settings are settings that define detailed control characteristics in rotational speed control. In this embodiment, the plurality of control settings that can be selected by the rotating electric machine control device 44 include at least a responsiveness priority setting and a stability priority setting.

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 electrical machine 24 closer to the target rotational speed as soon as possible. The responsiveness priority setting is at least a control setting that can bring the rotational speed of the rotating electric machine 24 closer to the target rotational speed faster than the stability priority setting. The responsiveness 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 set relatively high. Alternatively, the responsiveness priority setting is, for example, a setting in which the disturbance observer is activated while the rotational speed feedback control of the rotating electrical machine 24 is being executed. Here, the disturbance observer is a controller that estimates a torque (disturbance torque) that prevents the rotating electrical machine 24 from following the rotational speed, and adds a torque that cancels this estimated disturbance torque to the feedback torque in the rotational speed feedback control. As the disturbance observer, one having general specifications can be used as appropriate.

In particular, when the disturbance observer is activated in the responsiveness priority setting, it is preferable because the disturbance resistance is high and the disturbance can be corrected with high responsiveness, so that the followability of the rotational speed of the rotating electric machine 24 becomes high.

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 gives priority to suppressing fluctuations in feedback torque in rotational speed feedback control of the rotating electric machine 24 as much as possible. The stability priority setting is a control setting that can suppress fluctuations in feedback torque in rotational speed feedback control of the rotating electrical machine 24, at least 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 set relatively low. Alternatively, the responsiveness priority setting is, for example, a setting in which the disturbance observer is not activated while the rotational speed feedback control of the rotating electrical machine 24 is being executed. The disturbance observer is as described above.

When controlling the rotational speed of the rotating electrical machine 24, the rotating electric machine control device 44 selects one control setting from among the plurality of control settings, and executes the rotational speed control using the selected control setting. In this embodiment, the rotating electric machine control device 44 executes rotational speed control using either the responsiveness priority setting or the stability priority setting as an alternative. A method for selecting control settings will be described later.

Automatic transmission control device 45 controls automatic transmission 27 . The automatic transmission control device 45 controls the engagement state of a shift engagement device provided in the automatic transmission 27. The clutch control device 43 controls the engagement state of each shift engagement device so as to form the target gear position determined by the integrated control device 41. The clutch control device 43 regulates the hydraulic pressure of the hydraulic oil supplied from the oil pump OP using a hydraulic control device (not shown), and supplies the regulated hydraulic oil to each transmission engagement device.

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

As described above, when executing internal combustion engine starting control, the integrated control device 41 instructs the clutch control device 43 to perform control to bring each engagement device 22, 25 into a slip engagement state, and also controls rotation. The electric machine control device 44 is commanded to execute rotational speed control. The reason why the disengagement engagement device 22 is in the slip engagement state is to provide the disengagement engagement device 22 with a transmission torque capacity and crank the internal combustion engine EG with the torque of the rotating electric machine 24. The purpose of setting the transmission engagement device 25 in the slip engagement state is to prevent torque fluctuations from being transmitted to the wheels W at the time of initial combustion of the internal combustion engine EG.

The reason why the rotational speed control of the rotating electric machine 24 is executed is to increase the rotational speed of the rotating electric machine 24 to ensure that each of the engagement devices 22 and 25 is in the slip engagement state. In particular, in relation to the engagement state of the transmission engagement device 25, in order to change the previous direct engagement state to a slip engagement state, the rotational speed control of the rotating electric machine 24 is performed to reduce the differential rotational speed to a zero state. to a predetermined speed. As described above, one of the purposes of controlling the rotational speed of the rotating electrical machine 24 is to cause the transmission engagement device 25, which has a zero differential rotational speed, to generate a differential rotational speed (hereinafter referred to as "differential rotation generation"). executed.

Further, after the differential rotational speed reaches a predetermined speed, the differential rotational speed of the transmission 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 electrical machine 24 is to maintain the differential rotational speed of the transmission engagement device 25 that has reached a predetermined speed (hereinafter referred to as "differential rotation maintenance"). executed.

Furthermore, after the output torque of the internal combustion engine EG stabilizes after starting, it is no longer necessary to keep the transmission engagement device 25 in the slip engagement state. The differential rotational speed of the engagement device 25 is decreased towards zero. In this way, the rotational speed control of the rotating electric machine 24 is performed by converging the differential rotational speed of the transmission engagement device 25, which has finished its role upon completion of starting the internal combustion engine EG, toward zero (hereinafter referred to as "differential rotation convergence"). ) is also executed as one of the purposes.

In this way, even when controlling the rotational speed of the rotating electrical machine 24 in conjunction with internal combustion engine starting control, the purpose of the rotational speed control differs depending on the situation. Furthermore, the control characteristics required for controlling the rotational speed of the rotating electrical machine 24 often differ depending on the purpose.

Taking these points into consideration, the integrated control device 41 (second control device CT2) of the present embodiment, when instructing the rotating electric machine control device 44 (first control device CT1) to execute rotational speed control, Purpose information indicating the purpose of rotation speed control is also output. Normally, only the target command indicating the target rotation speed is output together with the rotation speed control execution command, but in this embodiment, in addition to the execution command and the target command, purpose information is also output to the rotating electrical machine. It is output to the control device 44 (first control device CT1).

As shown in FIG. 2, the purpose information is composed of a combination of a target object and an action. As explained above, the rotational speed control of the rotating electric machine 24 accompanying the internal combustion engine starting control includes generating a differential rotation of the transmission engagement device 25 (second engagement device CL2), maintaining the differential rotation of the transmission engagement device 25, In some cases, this is performed for the purpose of converging the differential rotation of the transmission engagement device 25. In these cases, the target object is the "transmission engagement device 25", and the target operations are "differential rotation generation", "differential rotation maintenance", and "differential rotation convergence", and the combination of these A part of the purpose information is constituted by:

Note that, as another example, the rotational speed control of the rotating electrical machine 24 may be performed for the purpose of prefilling the oil pump OP and an oil path extending from the oil pump OP with oil that has escaped due to the vehicle being stopped for a long time. The oil pump OP connected to the intermediate member 23 is driven by the torque of the rotating electric machine 24 to discharge oil, and the oil pump OP and the oil passage are prefilled with oil. In this case, the target object is the "oil pump OP" and the target operation is a "startup process" representing prefilling according to a predetermined startup sequence, and the combination of these constitutes part of the target information. ing.

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

When the integrated control device 41 (second control device CT2) outputs the purpose information together with the execution command and the target command, the rotating electric machine control device 44 that received them outputs the target command for the rotational speed of the rotating electric machine 24 according to the purpose information. Rotation speed control is executed so that the rotation speed approaches the target rotation speed shown in . The rotating electrical machine control device 44 executes rotational speed control of the rotating electrical machine 24 using control settings according to purpose information. In this embodiment, as shown in FIG. 2, each piece of purpose information (a combination of a target object and a motion) is associated in advance with a control setting suitable for that purpose.

To explain based on the example described above, "differential rotation generation" of "transmission engagement device 25" is associated with "responsiveness priority setting". "Difference rotation maintenance" of the "transmission engagement device 25" is associated with "responsiveness priority setting" or "stability priority setting", and more specifically, during cranking of the internal combustion engine EG, "Responsivity priority setting" is associated with "stability priority setting" after cranking of the internal combustion engine EG is completed. “Difference rotation convergence” is associated with “stability priority setting”. Further, "stability priority setting" is associated with "starting process" of "oil pump OP". Note that what is 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.

In the example shown in FIG. 2, if the purpose of the rotational speed control of the rotating electrical machine 24 is "differential rotation generation" of the "transmission engagement device 25", the rotating electrical machine control device 44 controls the "responsiveness priority setting". Execute rotation speed control in settings. Furthermore, when the purpose of the rotational speed control of the rotating electrical machine 24 is to "maintain differential rotation" of the "transmission engagement device 25", if the internal combustion engine EG is cranking, the rotating electrical machine control device 44 performs "response". Execute rotation speed control using the control settings of ``Priority Setting''. Furthermore, when the purpose of controlling the rotational speed of the rotating electrical machine 24 is to "maintain differential rotation" of the "transmission engagement device 25", if the internal combustion engine EG has finished cranking, the rotating electrical machine control device 44 Execute rotation speed control using the control settings of "Stability Priority Setting". Furthermore, if the purpose of the rotational speed control of the rotating electric machine 24 is "differential rotation convergence" of the "transmission engagement device 25", the rotating electric machine control device 44 controls the rotational speed with the control setting of the "stability priority setting". Execute. Further, if the purpose of the rotational speed control of the rotating electrical machine 24 is "starting processing" of the "oil pump OP", the rotating electrical machine control device 44 executes the rotational speed control with the control setting of "stability priority setting".

A specific example of each control in the internal combustion engine starting control will be explained with reference to the time chart of FIG. 3. When a request to start the internal combustion engine EG is issued at time T01, the oil pressure of the transmission engagement device 25 is gradually reduced. . During this time, the rotating electrical machine control device 44 is executing torque control of the rotating electrical machine 24. When the oil pressure of the transmission engagement device 25 drops to a predetermined oil pressure at time T02, the integrated control device 41 outputs an execution command for controlling the rotational speed of the rotating electric machine 24 together with a target command and purpose information. The purpose information here is "differential rotation generation" of the "transmission engagement device 25" in order to appropriately bring the transmission engagement device 25 into the slip engagement state.

As explained with reference to FIG. 2, since the "differential rotation generation" of the "transmission engagement device 25" is associated with the "responsiveness priority setting", the rotating electric machine control device 44 that has received the execution command , selects "responsiveness priority setting" and executes rotational speed control of the rotating electric machine 24 based on it. In this embodiment, the disturbance observer is activated while the rotational speed control of the rotating electric machine 24 is being executed. As a result, the rotational speed of the rotating electric machine 24 can be quickly brought close to the target rotational speed, and the target differential rotation of the transmission engagement device 25 can be quickly generated to quickly bring the transmission and engagement device 25 into the slip engagement state. Can be done.

When the target differential rotation of the transmission engagement device 25 is achieved at time T03, the purpose information is newly outputted (updated) by the integrated control device 41. The purpose information here is "differential rotation maintenance" of the "transmission engagement device 25" in order to appropriately maintain the slip engagement state of the transmission engagement device 25. Note that at this point, the internal combustion engine EG is stopped, but since cranking will start after that, the integrated control device 41 acquires information that the state of the internal combustion engine EG is "during cranking." do.

Since "maintenance of differential rotation (during cranking)" of the "transmission engagement device 25" is associated with "responsiveness priority setting", the rotating electric machine control device 44 that is executing rotational speed control is "responsive". The "speed priority setting" is continued as it is, and the rotational speed control of the rotating electric machine 24 is executed based on it. The disturbance observer also continues to operate. Thereby, the rotational speed of the rotating electric machine 24 can be kept close to the target rotational speed, and the target differential rotation of the transmission engagement device 25 can be appropriately maintained.

Therefore, the torque fluctuation that occurs when the internal combustion engine EG is started by supplying hydraulic pressure to the disconnection engagement device 22 and increasing the rotational speed of the internal combustion engine EG by the torque of the rotating electrical machine 24 is applied to the wheels W. It is possible to appropriately avoid being transmitted. At this time, even if the transmission torque of the disconnection engagement device 22 fluctuates due to cranking of the internal combustion engine EG, the influence of the torque fluctuation as a disturbance is corrected with high responsiveness, and the transmission and engagement device 25 The target differential rotation can be maintained appropriately, and the slip engagement state of the transmission engagement device 25 can be maintained appropriately.

When cranking of the internal combustion engine EG ends at time T04, the integrated control device 41 acquires information to that effect. Since "difference rotation maintenance (after cranking)" of the "transmission engagement device 25" is associated with "stability priority setting", the rotating electrical machine control device 44 executing rotation speed control The "responsiveness priority setting" is switched to the "stability priority setting", and the rotational speed control of the rotating electrical machine 24 is executed based on this. In this embodiment, the disturbance observer is inactive. This makes it possible to suppress fluctuations in the feedback torque, stably continue 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. Can be done.

Thereafter, when the output torque of the internal combustion engine EG becomes stable at time T05, the transmission 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 newly outputs (updates) the target command and purpose information in order to reduce the differential rotational speed of the transmission engagement device 25 and perform synchronous engagement. The target command here is the rotational speed of the speed change input member 26, and the purpose information is "differential rotation convergence" of the "transmission engagement device 25" in order to eliminate the slip engagement state of the transmission engagement device 25. It is.

Since the "difference rotation convergence" of the "transmission engagement device 25" is associated with the "stability priority setting", the rotating electric machine control device 44 that is executing rotation speed control can set the "stability priority setting". The process continues as it is, and the rotational speed control of the rotating electrical machine 24 is executed based on this. The disturbance observer remains inactive. Thereby, fluctuations in the feedback torque can be suppressed, and the differential rotational speed of the transmission engagement device 25 can be gradually reduced to smoothly approach zero. Therefore, the synchronous engagement of the transmission engagement device 25 can be appropriately performed at time T06, and the occurrence of torque fluctuations caused by the transition of the transmission engagement device 25 to the direct engagement state can be appropriately avoided.

As explained above, the vehicle drive system 1 of this embodiment is
Disconnection engagement devices 22 (first engagement devices) are installed in the power transmission path connecting the input member 21 drivingly connected to the internal combustion engine EG and the output member 30 drivingly connected to the wheels W, starting from the input member 21 side. CL1), a rotating electric machine 24, and a transmission engagement device 25 (second engagement device CL2), and an automatic transmission 27 is provided closer to the output member 30 than the rotating electric machine 24 in the power transmission path. A vehicle drive device 2;
A rotating electrical machine control device 44 (first control device CT1) that controls the rotating electrical machine 24;
A vehicle drive system 1 comprising at least an integrated control device 41 (second control device CT2) that controls an automatic transmission 27,
The rotating electric machine control device 44 (first control device CT1) can execute rotation speed control to control the rotation speed of the rotating electric machine 24 to approach a target rotation speed,
The integrated control device 41 (second control device CT2) can instruct the rotating electric machine control device 44 (first control device CT1) to execute rotation speed control, and also instructs the rotating electric machine control device to execute rotation speed control. 44 (first control device CT1), a target command indicating the target rotation speed and purpose information indicating the purpose of the rotation speed control are sent to the rotating electrical machine control device 44 (first control device CT1) together with the instruction to execute the rotation speed control. output to the first control device CT1),
The rotating electric machine control device 44 (first control device CT1) is equipped with a plurality of control settings used for rotational speed control in a selectable manner, and when receiving an execution command, selects a plurality of control settings according to the purpose information received together with the execution command. One control setting is selected from among the control settings, and using the selected control setting, rotational speed control is executed so that the rotational speed of the rotating electrical machine 24 approaches the target rotational speed indicated in the target command.

According to this configuration, when the integrated control device 41 (second control device CT2) instructs the rotating electric machine control device 44 (first control device CT1) to execute rotation speed control, the execution command and target rotation speed are indicated. In addition to the target command, purpose information indicating the purpose of rotational speed control is also output. Then, the rotating electric machine control device 44 (first control device CT1), which received the purpose information together with the execution command and the target command, selects one control setting from among the plurality of control settings according to the purpose information and selects one control setting from among the plurality of control settings. Perform rotational speed control using control settings. Therefore, the rotational speed control of the rotating electric machine 24 can be performed with optimal control settings depending on the purpose of rotational speed control. For example, by determining optimal control settings for each purpose of rotational speed control, the rotational speed control of the rotating electrical machine 24 can be executed with the optimal control settings.

In this case,
It is preferable that the purpose information includes the content of the operation to be performed using the transmission engagement device 25 (second engagement device CL2).

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

Also,
The plurality of control settings include at least a responsiveness priority setting and a stability priority setting,
The responsiveness priority setting is a control setting that can bring the rotational speed of the rotating electrical machine 24 closer to the target rotational speed faster than the stability priority setting,
It is preferable that 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.

According to this configuration, by selecting the responsiveness priority setting in controlling the rotational speed of the rotating electrical machine 24, the rotational speed of the rotating electrical machine 24 can be quickly brought close to the target rotational speed. On the other hand, by selecting stability priority setting in the rotational speed control of the rotating electrical machine 24, fluctuations in feedback torque in the rotational speed control of the rotating electrical machine 24 can be suppressed. By appropriately linking various control settings including responsiveness priority settings and stability priority settings to each control that involves rotational speed control of the rotating electrical machine 24, the rotation of the rotating electrical machine 24 is controlled. Speed control can be performed appropriately depending on the purpose.

Also,
The rotating electrical machine control device 44 (first control device CT1) is
If the purpose of the rotational speed control indicated in the purpose information is to generate a differential rotation for starting slip engagement of the transmission engagement device 25 (second engagement device CL2), select responsiveness priority setting,
If the purpose of the rotational speed control indicated in the purpose information is to converge the differential rotation to end the slip engagement of the transmission engagement device 25 (second engagement device CL2), it is possible to select the stability priority setting. preferable.

According to this configuration, when it is desired to generate a differential rotation for starting the slip engagement of the transmission engagement device 25 (second engagement device CL2), by selecting the responsiveness priority setting, the rotation of the rotating electric machine 24 is It is possible to quickly bring the speed close to the target rotation speed and quickly generate the target differential rotation. For example, if you want to end the slip engagement state of the transmission engagement device 25 (second engagement device CL2) after differential rotation is generated, by selecting the stability priority setting, the rotation speed of the rotating electric machine 24 can be controlled. The slip engagement state of the transmission engagement device 25 (second engagement device CL2) can be smoothly released by suppressing fluctuations in the feedback torque in .

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

According to this configuration, various operations using the oil pump OP can be performed appropriately to suit the purpose.

[Other embodiments]
(1) In the above embodiment, when the purpose of controlling the rotational speed of the rotating electrical machine 24 is to "maintain differential rotation" of the "transmission engagement device 25", whether or not the internal combustion engine EG is cranking is determined. The explanation has been given as an example of a configuration in which "responsiveness priority setting" and "stability priority setting" can be switched depending on the situation. However, without being limited to such a configuration, when the purpose of controlling the rotational speed of the rotating electrical machine 24 is to "maintain differential rotation" of the "transmission engagement device 25", the "responsive priority setting" is uniformly set. May be selected.

(2) In the above embodiment, the purpose 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. was explained as an example. However, the purpose is not limited to such a configuration, and the purpose is the content of the operation performed using other components provided in the vehicle drive device 2 (for example, "shifting" of the "automatic transmission 27", etc.) It may be considered information.

(3) In the above embodiment, the two examples of the plurality of control settings that can be selected by the rotating electrical machine control device 44 (first control device CT1) are the responsiveness priority setting and the stability priority setting. . However, the present invention is not limited to such a configuration, and other control settings other than these may be selectable. For example, a moderate setting that appropriately balances responsiveness and stability, or a high-accuracy priority setting that allows the rotational speed of the rotating electrical machine 24 to be brought closer to the target rotational speed with higher precision than the responsiveness priority setting or stability priority setting. Settings etc. may be selectable.

(4) In the above embodiment, the integrated control device 41 that indirectly controls the automatic transmission 27 via the automatic transmission control device 45 controls the rotational speed of the rotating electric machine control device 44 (first control device CT1). The explanation has been given as an example of a configuration in which the integrated control device 41 is configured to be able to command execution of control and is used as the second control device CT2. However, without being 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 execute rotation speed control. It's okay. 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 execute rotation speed control, the target command and purpose information output from the automatic transmission control device 45 are transmitted to the integrated control device 41. The configuration may be such that the output is output to the rotating electric machine control device 44 after being arbitrated in the .

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

(6) In the above embodiment, 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. was explained as an example. However, the present invention is not limited to such a configuration, and the rotating electric machine 24 is drive-coupled with the speed change input member 26 so as to rotate together with the speed change input member 26 without being provided with the transmission engagement device 25. One of the transmission engagement devices may be substituted for the transmission engagement device 25. In such a configuration, one of the plurality of shift engagement devices corresponds to the "second engagement device CL2."

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

(8) The configurations disclosed in each of the above-mentioned embodiments (including the above embodiments and other embodiments; the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments unless there is a conflict. It is also possible to do so. Regarding other configurations, the embodiments disclosed in this specification are illustrative in all respects, and can be modified as appropriate without departing from the spirit 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: speed change input member, 27: Automatic transmission, 28: Speed change 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 (5)

A first engagement device, a rotating electrical machine, and a second engagement device are provided in order from the input member side in a power transmission path connecting an input member drivingly connected to the internal combustion engine and an output member drivingly connected to the wheels. and an automatic transmission is provided closer to the output member than the rotating electric machine in the power transmission path;
a first control device that controls the rotating electric machine;
A vehicle drive system comprising at least a second control device that controls the automatic transmission,
The first control device is capable of executing rotational speed control that controls the rotational speed of the rotating electric machine to approach a target rotational speed,
The second control device can instruct the first control device to execute the rotation speed control, and when instructing the first control device to execute the rotation speed control, the second control device can instruct the first control device to execute the rotation speed control. outputting a target command indicating the target rotational speed and purpose information indicating the purpose of the rotational speed control to the first control device together with an execution command;
The first control device is capable of selecting a plurality of control settings used for the rotational speed control, and when receiving the execution command, selects the plurality of control settings according to the purpose information received together with the execution command. Select one of the control settings from among the above, and use the selected control setting to execute the rotational speed control so that the rotational speed of the rotating electrical machine approaches the target rotational speed indicated in the target command. , vehicle drive system. The vehicle drive system according to claim 1, wherein the purpose information includes details of an operation to be performed using the second engagement device. The plurality of control settings include at least a responsiveness priority setting and a stability priority setting,
The responsiveness priority setting is a control setting that can bring the rotational speed of the rotating electric machine closer to the target rotational speed faster than the stability priority setting,
The vehicle drive system according to claim 1 or 2, wherein 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 includes:
If the purpose of the rotational speed control indicated in the purpose information is to generate a differential rotation for starting slip engagement of the second engagement device, select the responsiveness priority setting;
4. 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. vehicle drive system. The vehicle drive device includes an oil pump drivingly connected to the rotating electric machine,
The vehicle drive system according to any one of claims 1 to 4, wherein the purpose information includes details of an operation to be performed using the oil pump.

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