WO2024034427A1

WO2024034427A1 - Vehicular drive device

Info

Publication number: WO2024034427A1
Application number: PCT/JP2023/027688
Authority: WO
Inventors: 尾関舞里菜; 渡辺忠明; 林純輝
Original assignee: 株式会社アイシン
Priority date: 2022-08-08
Filing date: 2023-07-28
Publication date: 2024-02-15

Abstract

This parking lock mechanism comprises: a locking member that is capable of moving between a locked position, at which the locking member engages with a target rotating member that rotates in conjunction with vehicle wheels to restrict the rotation of the target rotating member, and an unlocked position, at which the locking member is separated from the target rotating member to allow the target rotating member to rotate; a drive device that drives the locking member; and a position detection device that detects the position of the locking member. When the drive device generates driving force for moving the locking member from the locked position to the unlocked position, if movement of the locking member is not detected by the position detection device, a control device executes an unlock assist process in which the absolute value of the torque of a rotary electrical machine is gradually increased so as to weaken the engaging force between the locking member and the target rotating member until movement of the locking member is detected.

Description

Vehicle drive system

The present invention relates to a vehicle drive device that includes a rotating electric machine as a driving force source for wheels, and a parking lock mechanism that selectively restricts rotation of a target rotating member that rotates in conjunction with the wheels.

An example of such a vehicle drive device is disclosed in Patent Document 1 below. Hereinafter, in the description of the background art, the reference numerals in Patent Document 1 will be cited in parentheses.

In the vehicle drive device (110) disclosed in Patent Document 1, the parking lock mechanism (40) includes a parking lock gear ( 12), a parking pole (14) that restricts rotation of the parking lock gear, and a parking rod (16) that is driven by an actuator to selectively engage the parking pole with the parking lock gear.

Japanese Patent Application Publication No. 9-286312

By the way, when a vehicle is stopped on a sloped road surface, torque is transmitted from the wheels (126L, 126R) to the parking lock gear (12) due to the vehicle's own weight, so that the parking lock gear (12) and the parking pole ( 14) A load acts on the engaging portion. As a result, the driving force of the actuator for the parking rod (16) may not be able to release the parking pole (14) from the parking lock gear (12).

In the vehicle drive device (110) described above, the load required to reduce the load acting on the engagement portion between the parking lock gear (12) and the parking pole (14) to zero is determined based on the detection values of various sensors. Calculate the torque of the rotating electric machine (112). Then, by outputting the calculated torque to the rotating electric machine (112), the engagement of the parking pole (14) with the parking lock gear (12) is released by the driving force of the actuator for the parking rod (16). It has been realized. Patent Document 1 discloses that the parking lock is activated based on the rotational position of the parking lock gear (12) detected using a rotational position sensor (42), the tilt angle of the vehicle detected using a tilt angle sensor (52), etc. It is disclosed that the torque of the rotating electrical machine (112) required to zero the load acting on the engagement portion between the gear (12) and the parking pole (14) is calculated.

However, in the vehicle drive device (110) described above, when disengaging the parking pole (14) from the parking lock gear (12), it is necessary to calculate the torque of the rotating electric machine (112) using various sensors. This has led to a complicated configuration and increased costs.

Therefore, in a configuration including a parking lock mechanism, it is desired to realize a vehicle drive device that is easy to simplify the configuration and reduce costs.

In view of the above, the characteristic configuration of the vehicle drive device is as follows:
A rotating electric machine as a driving force source for the wheels,
a parking lock mechanism that selectively restricts rotation of a target rotating member that rotates in conjunction with the wheel;
A vehicle drive device comprising: a control device for controlling the rotating electric machine and the parking lock mechanism;
The parking lock mechanism has a lock position in which it engages with the target rotation member to restrict rotation of the target rotation member, and an unlocked position in which it is separated from the target rotation member and allows rotation of the target rotation member. comprising a movable lock member, a drive device that drives the lock member, and a position detection device that detects the position of the lock member,
The control device is configured to detect a case where movement of the lock member is not detected by the position detection device when the drive device is generating a driving force for moving the lock member from the lock position to the unlocked position. The lock release auxiliary process includes gradually increasing the absolute value of the torque of the rotating electrical machine so as to weaken the engagement force between the locking member and the target rotating member until movement of the locking member is detected. be.

According to this characteristic configuration, even if the locking member cannot be moved from the locked position to the unlocked position by the driving force of the drive device, the locking member and the target rotating member are moved using the torque of the rotating electric machine. Since the engaging force of the parking lock mechanism can be weakened, the parking lock mechanism can be brought into an unlocked state by the driving force of the driving device. At this time, since the torque of the rotating electrical machine is gradually increased until movement of the locking member is detected, it becomes easy to set the torque of the rotating electrical machine to an appropriate value for unlocking the parking lock mechanism. This makes it possible to eliminate the need for various sensors for calculating the torque of the rotating electric machine required to weaken the engagement force between the lock member and the target rotating member. Therefore, in the configuration provided with the parking lock mechanism, it is easy to simplify the configuration and reduce the cost of the vehicle drive device.

A cross-sectional view showing a part of a vehicle drive device according to an embodiment. Skeleton diagram of a vehicle drive device according to an embodiment Control block diagram of a vehicle drive device according to an embodiment A sectional view showing the engagement between the lock member and the target rotating member Flowchart showing an example of control processing of the control device Time chart showing an example of control processing of the control device Time chart showing an example of control processing of the control device

Below, a vehicle drive device 100 according to an embodiment will be described with reference to the drawings. As shown in FIG. 1, the vehicle drive device 100 includes a rotating electric machine 1 and a parking lock mechanism 10.

The rotating electric machine 1 functions as a driving force source for wheels W (see FIG. 2) included in the vehicle. The rotating electric machine 1 has a function as a motor (electric motor) that receives power supply and generates power, and a function as a generator (generator) that receives power supply and generates power. Specifically, the rotating electrical machine 1 is electrically connected to a power storage device (not shown) such as a battery or a capacitor. Then, the rotating electric machine 1 performs power running using the electric power stored in the power storage device to generate driving force. Further, the rotating electric machine 1 generates power using the driving force transmitted from the wheel W side, and charges the power storage device.

The rotating electric machine 1 includes a stator 11 and a rotor 12. The stator 11 includes a cylindrical stator core 11a. Stator core 11a is fixed to non-rotating member NR. The rotor 12 includes a cylindrical rotor core 12a. Rotor core 12a is rotatably supported by stator core 11a. In this embodiment, the rotor 12 further includes a rotor shaft 12b connected to rotate integrally with the rotor core 12a.

In the following description, the direction along the rotational axis of the rotor 12 will be referred to as the "axial direction L." One side in the axial direction L is defined as the "first axial side L1", and the other side in the axial direction L is defined as the "second axial side L2". Further, a direction perpendicular to the axial direction L is referred to as a "radial direction R." The radial direction R is defined with each rotational axis of a rotating member such as the rotor 12 as a reference. Note that when there is no need to distinguish which rotational axis is used as a reference or when it is clear which rotational axis is used as a reference, it may be simply written as "radial direction R."

In this embodiment, the rotating electrical machine 1 is an inner rotor type rotating electrical machine. Therefore, the rotor core 12a is arranged inside the stator core 11a in the radial direction R. Further, the rotor shaft 12b is arranged inside the rotor core 12a in the radial direction R.

Furthermore, in this embodiment, the rotating electrical machine 1 is a rotating field type rotating electrical machine. Therefore, a stator coil is wound around the stator core 11a. In this embodiment, the stator coil is wound around the stator core 11a so that a coil end portion 11b protruding in the axial direction L with respect to the stator core 11a is formed. Although not shown, the rotor core 12a is provided with a permanent magnet.

The parking lock mechanism 10 selectively restricts the rotation of the target rotating member T that rotates in conjunction with the wheels W (see FIG. 2). In this embodiment, the target rotating member T is the rotor shaft 12b. Note that the detailed configuration of the parking lock mechanism 10 will be described later.

As shown in FIG. 2, in this embodiment, the vehicle drive device 100 further includes a power transmission mechanism 2, a differential gear mechanism 3, and a case 9.

The power transmission mechanism 2 transmits the rotation of the rotor 12 to the differential gear mechanism 3. In this embodiment, the power transmission mechanism 2 includes a planetary gear mechanism 21, a first gear 22, and a second gear 23. In this embodiment, the planetary gear mechanism 21 and the first gear 22 are arranged on the first axis X1, which is the rotation axis of the rotor 12. The second gear 23 is arranged on a second axis X2 different from the first axis X1.

The planetary gear mechanism 21 is configured to reduce the rotation speed of the rotor 12 and transmit it to the first gear 22. The planetary gear mechanism 21 includes a sun gear SG, a carrier CR, and a ring gear RG.

The sun gear SG is connected to the rotor 12 so as to rotate integrally with the rotor 12. That is, the sun gear SG is an input element of the planetary gear mechanism 21. In this embodiment, sun gear SG is connected to rotor shaft 12b via input shaft I so as to rotate integrally with rotor shaft 12b. The input shaft I is formed to extend along the axial direction L. In this embodiment, the input shaft I is formed to extend from the sun gear SG toward the first axial side L1.

The carrier CR rotatably supports a first pinion gear PG1 and a second pinion gear PG2 that rotate integrally with each other. Each of the first pinion gear PG1 and the second pinion gear PG2 rotates (rotates) around its own axis, and also rotates (revolutions) around the sun gear SG together with the carrier CR. A plurality of first pinion gears PG1 and second pinion gears PG2 are provided at intervals along their own orbits.

The first pinion gear PG1 is meshed with the sun gear SG. The second pinion gear PG2 meshes with the ring gear RG. The second pinion gear PG2 is formed to have a smaller diameter than the first pinion gear PG1. In this embodiment, the second pinion gear PG2 is arranged closer to the first axial side L1 than the first pinion gear PG1.

The carrier CR is connected to the first gear 22 so as to rotate integrally therewith. That is, the carrier CR is an output element of the planetary gear mechanism 21. In this embodiment, the first gear 22 is arranged on the second axial side L2 with respect to the planetary gear mechanism 21.

Ring gear RG is fixed to non-rotating member NR. In this embodiment, ring gear RG is fixed to case 9 as non-rotating member NR.

The first gear 22 and the second gear 23 mesh with each other. In this embodiment, the second gear 23 is formed to have a larger diameter than the first gear 22. Therefore, in this embodiment, the rotation of the carrier CR of the planetary gear mechanism 21 is reduced in speed between the first gear 22 and the second gear 23 and transmitted to the differential gear mechanism 3.

The differential gear mechanism 3 distributes the rotation transmitted from the power transmission mechanism 2 to the pair of wheels W. In this embodiment, the differential gear mechanism 3 is arranged on the second axis X2.

In this embodiment, the differential gear mechanism 3 is a bevel gear type differential gear mechanism. Specifically, the differential gear mechanism 3 includes a pair of pinion gears, a first side gear and a second side gear that mesh with the pair of pinion gears, and a differential case that accommodates these gears.

In this embodiment, the differential case is connected to the second gear 23 so as to rotate integrally therewith. Further, the differential case is connected to rotate integrally with a pinion shaft that rotatably supports a pair of pinion gears. In the present embodiment, the first side gear rotates integrally with the first drive shaft DS1 that is drivingly connected to the wheel W on the first axial side L1 via the transmission shaft 35 extending along the axial direction L. are connected so that Further, the second side gear is connected to rotate integrally with a second drive shaft DS2 that is drivingly connected to the wheel W on the second axial side L2.

The case 9 houses the rotating electrical machine 1, the power transmission mechanism 2, the differential gear mechanism 3, and the parking lock mechanism 10. As shown in FIG. 1, in this embodiment, the case 9 includes a first cylindrical part 91, a second cylindrical part 92, a first side wall part 93, and a second side wall part 94. .

Each of the first cylindrical part 91 and the second cylindrical part 92 is formed into a cylindrical shape concentric with the rotor 12. In this embodiment, the rotor shaft 12b is formed into a cylindrical shape having an axis along the axial direction L. The first cylindrical portion 91 is disposed outside the rotor shaft 12b in the radial direction R. Further, the second cylindrical portion 92 is arranged inside the rotor shaft 12b in the radial direction R. In this embodiment, the rotor shaft 12b is rotatably supported with respect to the case 9 via a rotor bearing B1 disposed between the rotor shaft 12b and the first cylindrical portion 91 in the radial direction R. There is.

The first side wall portion 93 is formed to extend outward in the radial direction R from the first cylindrical portion 91. The first side wall portion 93 is arranged to cover the first axial side L1 of the rotating electrical machine 1. The second side wall portion 94 is formed to extend inward in the radial direction R from the first cylindrical portion 91 . The second side wall portion 94 is disposed closer to the first side L1 in the axial direction than the first side wall portion 93 is. In the present embodiment, the second side wall portion 94 is connected to the end of the first cylindrical portion 91 on the first axial side L1 so as to cover the first cylindrical portion 91 from the first axial side L1. There is. Further, in this embodiment, the second cylindrical portion 92 is formed to extend from the second side wall portion 94 toward the second axial side L2.

As shown in FIG. 1, the parking lock mechanism 10 includes a lock member 4 and a drive device 5.

The locking member 4 has a locking position P1 in which it engages with the target rotating member T to restrict rotation of the target rotating member T, and a non-locking position P2 in which it is separated from the target rotating member T and allows rotation of the target rotating member T. It is configured to be movable. The locking member 4 is supported so as not to rotate relative to the non-rotating member NR. In this embodiment, the lock member 4 includes a cylindrical portion 41 that is concentric with the rotor 12 .

The cylindrical portion 41 is disposed on the outside of the second cylindrical portion 92 of the case 9 in the radial direction R. An engaging portion 411 is formed on the inner peripheral surface of the cylindrical portion 41 . An engaged portion 921 is formed on the outer peripheral surface of the second cylindrical portion 92 . The engaging portion 411 is movable in the axial direction L and is engaged with the engaged portion 921 so as not to be relatively rotatable. Here, the engaging portion 411 is an unevenness formed along the circumferential direction on the inner circumferential surface of the cylindrical portion 41, and is continuously formed along the axial direction L. The engaged portion 921 is a concavity and convexity formed along the circumferential direction on the outer circumferential surface of the second cylindrical portion 92, and is continuously formed along the axial direction L.

In this embodiment, the end portion of the outer peripheral surface of the cylindrical portion 41 on the second axial side L2 is engaged with the locked portion Ta of the target rotating member T from the first axial side L1, and A locking portion 412 that restricts rotation of the rotating member T is formed. Here, the locking portion 412 is an unevenness formed along the circumferential direction on the outer peripheral surface of the cylindrical portion 41, and extends from the end surface of the axially second side L2 of the cylindrical portion 41 to the axially first side L1. It is formed continuously. The locked portion Ta is an unevenness formed along the circumferential direction on the inner peripheral surface of the rotor shaft 12b, and is directed from the end surface of the first axial side L1 of the rotor shaft 12b toward the second axial side L2. It is formed continuously.

In this embodiment, when the locking member 4 moves from the non-locking position P2 to the second axial side L2 and is at the locking position P1, the locking part 412 of the cylindrical part 41 is connected to the locked part of the target rotating member T. Ta is engaged, and the parking lock mechanism 10 becomes locked. On the other hand, when the lock member 4 is in the unlocked position P2, the lock member 4 is separated from the target rotating member T toward the first axial side L1, and the parking lock mechanism 10 is in the unlocked state. In this embodiment, not only the position closest to the first axial side L1 in the movable region of the lock member 4 but also the position on the second axial side L2 from this position corresponds to the unlocked position P2. That is, in this embodiment, when the locking member 4 is within a predetermined range from the position of the first axial side L1 to the second axial side L2 in the movable region, the locking part 412 is located at the locked part. When the locking member 4 moves from that range to the second axial side L2 without engaging with the locked portion Ta, the locking portion 412 engages with the locked portion Ta.

The drive device 5 is a device that drives the lock member 4. In this embodiment, the drive device 5 includes a position holding section 6 and an electromagnetic drive section 7.

The position holding section 6 includes a permanent magnet 61 supported by the locking member 4. The position holding section 6 holds the locking member 4 at each of the locked position P1 and the unlocked position P2 by the magnetic force of the permanent magnet 61. Note that the permanent magnet 61 may be configured by joining a plurality of divided magnets.

The permanent magnet 61 is a permanent magnet having an N pole and an S pole. In this embodiment, the permanent magnet 61 is arranged so that the north pole and the south pole are lined up in the axial direction L. Specifically, the permanent magnet 61 is arranged so that its north pole and south pole are aligned in the axial direction L on the side of the electromagnetic drive unit 7 (in this embodiment, on the outside in the radial direction R). For example, one permanent magnet 61 is arranged such that the N pole and S pole of the permanent magnet 61 are aligned in the axial direction L on the side of the electromagnetic drive unit 7, or two permanent magnets 6 are arranged such that one permanent magnet 61 The north pole of the magnet 61 and the south pole of the other permanent magnet 61 are arranged so as to be lined up in the axial direction L on the electromagnetic drive unit 7 side. In the following description, one of the N and S poles of the permanent magnet 61 will be referred to as a "first pole 61A", and the other will be referred to as a "second pole 61B". The permanent magnets 61 are arranged so that the first pole 61A and the second pole 61B are lined up in this order from the first axial side L1 to the second axial side L2.

In this embodiment, the permanent magnet 61 is formed into a cylindrical shape concentric with the rotor 12. The permanent magnet 61 is fixed to the cylindrical portion 41 of the lock member 4. In the example shown in FIG. 1, the permanent magnet 61 is fixed to a portion of the outer peripheral surface of the cylindrical portion 41 that is closer to the first axial side L1 than the locking portion 412.

The electromagnetic drive unit 7 moves the locking member 4 from the unlocked position P2 to the locked position P1 and from the locked position P1 to the unlocked position by electromagnetic force generated by electric power from a power source (not shown). Move to lock position P2. In this embodiment, the electromagnetic drive unit 7 is formed in a cylindrical shape concentric with the permanent magnet 61. Further, in this embodiment, the electromagnetic drive section 7 includes a fixed section 70, a first magnetic section 71, a second magnetic section 72, a third magnetic section 73, and a coil 74. .

The fixed part 70 is fixed to the non-rotating member NR. In this embodiment, the fixing part 70 is formed into a cylindrical shape concentric with the first cylindrical part 91 of the case 9 . The fixing part 70 is fixed to the inner circumferential surface of the first cylindrical part 91.

Each of the first magnetic body part 71, the second magnetic body part 72, and the third magnetic body part 73 is made of a magnetic body. The first magnetic body part 71, the second magnetic body part 72, and the third magnetic body part 73 are arranged at intervals in the axial direction L in the stated order. In this embodiment, the first magnetic body part 71, the second magnetic body part 72, and the third magnetic body part 73 are formed to protrude inward in the radial direction R from the fixed part 70. The first magnetic body part 71, the second magnetic body part 72, and the third magnetic body part 73 are arranged in the stated order from the first axial side L1 to the second axial side L2. ing.

The coil 74 is configured to generate magnetic flux passing through the first magnetic body part 71, the second magnetic body part 72, and the third magnetic body part 73 when energized. In the present embodiment, the coil 74 is located between the first magnetic body part 71 and the second magnetic body part 72 in the axial direction L on the inner circumferential surface of the fixed part 70, and between the second magnetic body part 72 and the third magnetic body part 72. It is wound in each direction between the magnetic body portion 73 and the axial direction L.

As shown in FIG. 3, the vehicle drive device 100 includes a control device 20 that controls the rotating electrical machine 1 and the parking lock mechanism 10.

In this embodiment, the vehicle drive device 100 further includes a rotational position sensor 13 that detects the rotational position of the rotor 12 of the rotating electric machine 1. The control device 20 controls the rotating electrical machine 1 based on the rotational position of the rotor 12 detected by the rotational position sensor 13. As the rotational position sensor 13, a resolver can be used. In this case, for example, the stator of the resolver can be fixed to the case 9, and the rotor of the resolver can be connected to the rotor shaft 12b. Note that the rotational position sensor 13 is not limited to a resolver, and various sensors such as a Hall element sensor, an encoder, and a magnetic rotation sensor can be used, for example.

In the present embodiment, the parking lock mechanism 10 further includes a position detection device 8 that detects the position of the lock member 4 (here, the position in the axial direction L). As the position detection device 8, various sensors such as a displacement sensor and a potentiometer can be used, for example.

The control device 20 controls the parking lock mechanism 10 based on the position of the lock member 4 detected by the position detection device 8. In this embodiment, the control device 20 controls the operation of the locking member 4 by controlling the current flowing through the coil 74. To explain, when the control device 20 does not apply current to the coil 74 and the locking member 4 is in the non-locking position P2, the first pole 61A attracts the first magnetic body part 71, and the second pole 61B attracts the first magnetic body part 71. 2 magnetic material portion 72 is attracted. Then, when the control device 20 moves the locking member 4 from the non-locking position P2 to the locking position P1, the first magnetic body part 71 becomes a pole that repels the first pole 61A, and the second magnetic body part 72 becomes a second pole. A current is passed through the coil 74 so that the third magnetic body portion 73 becomes a pole that repels the pole 61B and attracts the second pole 61B. Further, when the control device 20 does not apply current to the coil 74 and the lock member 4 is in the lock position P1, the first pole 61A attracts the second magnetic body part 72, and the second pole 61B attracts the third magnetic body part 73 is in a state of being sucked. When the control device 20 moves the lock member 4 from the lock position P1 to the unlocked position P2, the second magnetic body part 72 becomes a pole that repels the first pole 61A, and the third magnetic body part 73 becomes a second pole. A current is passed through the coil 74 so that the first magnetic body part 71 becomes a pole that repels the pole 61B and attracts the first pole 61A.

By the way, when a vehicle equipped with the vehicle drive device 100 is stopped on an inclined road surface, torque is transmitted from the wheels W to the target rotating member T (here, the rotor shaft 12b) due to the vehicle's own weight. . Therefore, as shown in FIG. 4, the locked portion Ta of the target rotating member T is locked so as to strengthen the engagement force between the locking portion 412 of the locking member 4 and the locked portion Ta of the target rotating member T. It comes into contact with the locking portion 412 of the locking member 4 at position P1. In the following description, the torque transmitted to the target rotating member T, which acts to strengthen the engagement force between the locking portion 412 and the locked portion Ta, will be referred to as “load torque”. Note that the direction of the load torque can be determined based on the rotational position of the rotor 12 detected by the rotational position sensor 13, for example. If the vehicle is provided with a tilt angle sensor, the direction of the load torque may be determined by the tilt angle sensor. Alternatively, the direction of the load torque may be determined based on the slope of the road surface based on map information.

Depending on the magnitude of the load torque, the driving force (here, electromagnetic force) of the drive device 5 may not be able to release the engagement of the locking portion 412 with the locked portion Ta. Therefore, in the vehicle drive device 100, the rotating electrical machine 1 is caused to output torque so as to weaken the engagement force between the locking portion 412 and the locked portion Ta, that is, to cancel the load torque. In the following description, the absolute value of the torque output by the rotating electrical machine 1 to cancel out the load torque will be referred to as "load cancellation torque."

Hereinafter, the control processing of the control device 20 when unlocking the parking lock mechanism 10 will be explained with reference to FIGS. 5 to 7.

FIG. 5 is a flowchart illustrating an example of control processing by the control device 20. As shown in FIG. 5, the control device 20 first responds to a request from the vehicle driver to unlock the parking lock mechanism 10, that is, from the parking range (P range) to the other ranges (for example, the forward driving range (D range). It is determined whether a change in the shift position to range)) has been detected (step #1).

If the request to unlock the parking lock mechanism 10 by the vehicle driver is not detected (step #1: No), the control device 20 executes the above step #1 again. That is, the control device 20 executes step #1 described above until a request to unlock the parking lock mechanism 10 by the driver of the vehicle is detected.

When a request to unlock the parking lock mechanism 10 by the vehicle driver is detected (step #1: Yes), the control device 20 controls a drive for moving the lock member 4 from the lock position P1 to the unlocked position P2. A force is generated in the drive device 5 (step #2). In the present embodiment, the control device 20 causes the drive device 5 to generate an electromagnetic force for moving the lock member 4 from the lock position P1 to the unlocked position P2 by passing a current through the coil 74.

The control device 20 determines whether movement of the lock member 4 is detected by the position detection device 8 as the driving force of the drive device 5 is generated (step #3). When the position detection device 8 detects movement of the locking member 4 with the generation of the driving force of the drive device 5 (step #3: Yes), the control device 20 ends the control process.

On the other hand, if the position detection device 8 does not detect movement of the locking member 4 even after a predetermined period of time has passed after the drive force of the drive device 5 is generated (step #3: No), the control device 20 generates a load canceling torque. (Step #4). Then, the control device 20 determines whether movement of the locking member 4 is detected by the position detection device 8 as the load canceling torque increases (step #5).

If the position detection device 8 does not detect movement of the locking member 4 even if the load canceling torque increases (step #5: No), the control device 20 returns to step #4 and continues the control process. That is, after the control device 20 gradually increases the load canceling torque, the control device 20 executes steps #4 and #5 described above until the movement of the locking member 4 is detected by the position detection device 8.

When the position detection device 8 detects movement of the locking member 4 as the load canceling torque increases (Step #5: Yes), the control device 20 maintains the load canceling torque constant (Step #6).

While maintaining the load canceling torque constant, the control device 20 determines whether movement of the locking member 4 is detected by the position detection device 8 (step #7).

If the position detection device 8 does not detect movement of the locking member 4 while maintaining the load cancellation torque constant (step #7: No), that is, from the locking position P1 to the non-locking position P2, the control device 20 When it is detected that the lock member 4 that was moving towards the target has stopped, the load canceling torque is gradually increased (step #8). Then, the control device 20 determines whether movement of the locking member 4 is detected by the position detection device 8 as the load canceling torque increases (step #9).

If the position detection device 8 does not detect movement of the locking member 4 even if the load canceling torque increases (step #9: No), the control device 20 returns to step #8 and continues the control process. That is, after the control device 20 gradually increases the load canceling torque, the control device 20 executes steps #8 and #9 described above until the movement of the locking member 4 is detected by the position detection device 8.

When the position detection device 8 detects movement of the locking member 4 as the load canceling torque increases (Step #9: Yes), the control device 20 maintains the load canceling torque constant (Step #10).

Thereafter, the control device 20 determines whether rotation of the rotating electrical machine 1 (specifically, the rotor 12) has been detected, and whether the position detection device 8 has detected that the lock member 4 has reached the unlocked position P2. It is determined whether or not (step #11). In this embodiment, the control device 20 determines whether or not the rotation of the rotating electrical machine 1 is detected based on the rotational position of the rotor 12 detected by the rotational position sensor 13.

When the control device 20 detects the rotation of the rotating electrical machine 1 or when the position detection device 8 detects that the locking member 4 has reached the unlocked position P2 (step #11: Yes), the control device 20 calculates the load cancel torque. is gradually decreased (step #12), and the control process is ended.

On the other hand, if the rotation of the rotating electric machine 1 is not detected and the position detection device 8 also does not detect that the locking member 4 has reached the unlocked position P2 (step #11: No), the control device 20 performs the above-mentioned The process returns to step #7 to continue the control process. In addition, in the above step #7, if the movement of the locking member 4 is detected by the position detection device 8 (step #7: Yes), the above steps #8 to #10 are not executed, and the above step #11 is executed. Execute.

As described above, the vehicle drive device 100 is
A rotating electrical machine 1 as a driving force source for wheels W,
a parking lock mechanism 10 that selectively restricts rotation of a target rotating member T that rotates in conjunction with wheels W;
A vehicle drive device 100 including a control device 20 that controls a rotating electrical machine 1 and a parking lock mechanism 10,
The parking lock mechanism 10 has a lock position P1 where it engages with the target rotating member T to restrict rotation of the target rotating member T, and an unlocked position P2 where it is separated from the target rotating member T and allows rotation of the target rotating member T. A lock member 4 that is movable, a drive device 5 that drives the lock member 4, and a position detection device 8 that detects the position of the lock member 4,
The control device 20 determines whether movement of the lock member 4 is not detected by the position detection device 8 when the drive device 5 is generating a driving force for moving the lock member 4 from the lock position P1 to the unlocked position P2. In this step, a lock release assisting process is executed in which the absolute value of the torque of the rotating electric machine 1 is gradually increased so as to weaken the engagement force between the lock member 4 and the target rotating member T until the movement of the lock member 4 is detected.
Note that in the flowchart shown in FIG. 5, steps #3 and #4 correspond to the unlock assisting process.

According to this configuration, even if the lock member 4 cannot be moved from the lock position P1 to the unlocked position P2 by the driving force of the drive device 5, the lock member 4 is moved using the torque of the rotating electric machine 1. Since the engagement force between the target rotating member T and the target rotating member T can be weakened, the parking lock mechanism 10 can be brought into the unlocked state by the driving force of the driving device 5. At this time, the torque of the rotating electric machine 1 is gradually increased until the movement of the locking member 4 is detected, so that it is easy to set the torque of the rotating electric machine 1 to an appropriate value for unlocking the parking lock mechanism 10. . This makes it possible to eliminate the need for various sensors for calculating the torque of the rotating electric machine 1 required to weaken the engagement force between the lock member 4 and the target rotating member T. Therefore, in a configuration including the parking lock mechanism 10, it is easy to simplify the configuration and reduce the cost of the vehicle drive device 100.

Further, in this embodiment, the control device 20
If movement of the locking member 4 is detected by the position detection device 8 during execution of the lock release auxiliary process, a torque maintenance process is executed to maintain the torque of the rotating electric machine 1 constant,
When the rotation of the rotating electric machine 1 is detected during the execution of the torque maintenance process, or when the position detection device 8 detects that the locking member 4 has reached the unlocked position P2, the torque of the rotating electric machine 1 is Execute termination processing to gradually decrease the absolute value of .
Note that in the flowchart shown in FIG. 5, steps #5 and #6 correspond to torque maintenance processing. Furthermore, steps #11 and #12 correspond to termination processing.

According to this configuration, the absolute value of the torque of the rotating electrical machine 1 increases excessively in the lock release auxiliary process, and the engagement force between the locking member 4 and the target rotating member T increases, so that the movement of the locking member 4 is prevented. You can avoid being blocked. Furthermore, by continuing to output the torque of the rotating electric machine 1 even after the parking lock mechanism 10 is unlocked, it is possible to avoid transmitting unnecessary torque to the wheels W.

Furthermore, in the present embodiment, if the movement of the locking member 4 is no longer detected by the position detection device 8 during execution of the torque maintenance process, the control device 20 locks the locking member 4 until the movement of the locking member 4 is detected. Additional auxiliary processing is performed to gradually increase the absolute value of the torque of the rotating electric machine 1 so as to weaken the engagement force between the member 4 and the target rotating member T.
Note that in the flowchart shown in FIG. 5, steps #7 and #8 correspond to additional auxiliary processing.

According to this configuration, even if the torque of the rotating electric machine 1 is insufficient in the torque maintenance process and the movement of the locking member 4 is stopped, the torque of the rotating electric machine 1 is reduced to the locking member 4 by the additional auxiliary process. It becomes easy to set the appropriate value for the move.

Furthermore, in this embodiment, the drive device 5 is configured to move the lock member 4 from the lock position P1 to the unlocked position P2 by electromagnetic force.

Although the drive device 5 configured in this way can suppress power consumption to a low level, the driving force for driving the lock member 4 is often insufficient. However, as described above, even if the lock member 4 cannot be moved from the lock position P1 to the unlocked position P2 by the driving force of the drive device 5, the lock member 4 is Since the engagement force between the target rotating member T and the target rotating member T can be weakened, the drive device 5 having this configuration can be used.

FIG. 6 is a time chart showing an example of the control process of the control device 20 when the parking lock mechanism 10 is unlocked.

As shown in FIG. 6, when the control device 20 detects a request to unlock the parking lock mechanism 10 by the driver of the vehicle, it supplies current to the coil 74 at time t1 to move the lock member 4 from the lock position P1 to the unlocked state. The drive device 5 generates an electromagnetic force for moving to the position P2.

At time t2, when a predetermined time has elapsed from time t1, the control device 20 detects that the lock member 4 does not move from the first position PA, which is the lock position P1, and gradually reduces the torque of the rotating electric machine 1 from zero. (Lock release auxiliary processing). In this example, the first position PA is the position closest to the second axial side L2 in the movable region of the locking member 4.

In this example, the rate of increase in the absolute value of the torque (load canceling torque) of the rotating electrical machine 1 during the execution of the lock release auxiliary process is determined by the rotation of the rotating electrical machine immediately after the rotation of the rotating electrical machine is detected by the rotation sensor of the rotating electrical machine. Preferably, the speed is set to the highest within a range in which the driver does not sense the rotation of the wheels W when the wheels W are stopped. According to this, it is possible to both increase the speed of the unlock assistance process and suppress the discomfort felt by the driver.

Due to the unlock assist process, the torque value of the rotating electric machine 1 becomes T1 (T1<0 in this example) at time t3. When the movement of the lock member 4 toward the unlocked position P2 (first axial side L1) is detected at time t3, the control device 20 maintains the torque of the rotating electrical machine 1 constant (torque maintenance process). .

The locking member 4 reaches the second position PB as the unlocked position P2 at time t4. In this example, the second position PB is a position on the second axial side L2 of the movable region of the locking member 4, rather than the position furthest on the first axial side L1. Further, the rotational position of the rotor 12, which has been maintained at θ1, reaches θ2 at time t4.

At time t4, the control device 20 detects that the rotational position of the rotor 12 has reached θ2, determines that the rotor 12 has rotated, and determines that the locking member 4 has reached the unlocked position P2, and stops rotating. The torque of the electric machine 1 is gradually increased (termination process). Then, the control device 20 sets the torque of the rotating electrical machine 1 to zero at time t5. Furthermore, the control device 20 stops energizing the coil 74 at time t5. In this example, the rate of decrease in the absolute value of the torque of the rotating electrical machine 1 (load canceling torque) during the execution of the termination process is the same as the decreasing speed of the absolute value of the torque of the rotating electrical machine 1 (load canceling torque) during the execution of the lock release auxiliary process. higher than the rate of increase.

FIG. 7 is a time chart showing an example of the control process of the control device 20 when the parking lock mechanism 10 is unlocked. The time chart in FIG. 7 differs from that in FIG. 6 in that additional auxiliary processing is executed. Note that in the time chart of FIG. 7, description of the same parts as in FIG. 6 will be omitted.

As shown in FIG. 7, in this example, at time t31 during execution of the torque maintenance process, it is detected that the lock member 4 does not move from the third position PC, and the torque of the rotating electrical machine 1 is gradually decreased from T1 ( additional auxiliary processing).

In this example, the rate of increase in the absolute value of the torque of the rotating electric machine 1 (load canceling torque) during the execution of the additional auxiliary process is the absolute value of the torque of the rotating electric machine 1 (load canceling torque) during the execution of the unlocking auxiliary process. is lower than the rate of increase.

According to this configuration, the absolute value of the torque of the rotating electrical machine 1 increases excessively in the additional auxiliary processing, and the engagement force between the locking member 4 and the target rotating member T increases on the contrary, thereby hindering the movement of the locking member 4. You can avoid being caught.

Due to the additional auxiliary processing, the torque value of the rotating electric machine 1 becomes T2 (T2<T1 in this example) at time t32. When the movement of the lock member 4 toward the unlocked position P2 (first axial side L1) is detected at time t32, the control device 20 maintains the torque of the rotating electric machine 1 constant (torque maintenance process). . In this way, in this example, the control device 20 maintains the torque of the rotating electric machine 1 constant even when the position detection device 8 detects movement of the lock member 4 during execution of the additional auxiliary process. Execute maintenance processing.

[Other embodiments]
(1) In the above embodiments, a configuration in which the target rotating member T is the rotor shaft 12b has been described as an example. However, without being limited to such a configuration, for example, the target rotating member T may be a carrier CR. Alternatively, instead of the rotating member itself constituting the power transmission path connecting the rotating electric machine 1 and the wheels W, the target rotating member T may be a parking gear connected to the rotating member.

(2) In the above embodiment, the configuration in which the drive device 5 uses electromagnetic force to move the lock member 4 from the lock position P1 to the unlocked position P2 has been described as an example. However, without being limited to such a configuration, for example, a configuration may be adopted in which the lock member 4 is moved from the lock position P1 to the unlocked position P2 by the driving force of an electric motor.

(3) In the above embodiment, the rate of increase in the absolute value of the torque of the rotating electrical machine 1 (load canceling torque) during the execution of the additional auxiliary process is the absolute value of the torque of the rotating electrical machine 1 during the execution of the unlocking auxiliary process. An example of a configuration that is lower than the increase rate of (load canceling torque) has been explained. However, without being limited to such a configuration, the rate of increase in the absolute value of the torque (load canceling torque) of the rotating electric machine 1 during execution of the additional auxiliary process is the same as the increase rate of the absolute value of the torque (load canceling torque) of the rotating electric machine 1 during the execution of the unlocking auxiliary process. It may be greater than or equal to the rate of increase in the absolute value of torque (load canceling torque).

(4) Note that the configurations disclosed in each of the embodiments described above can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction occurs. Regarding other configurations, the embodiments disclosed herein are merely illustrative in all respects. Therefore, various modifications can be made as appropriate without departing from the spirit of the present disclosure.

[Summary of this embodiment]
Below, an overview of the vehicle drive system (100) described above will be described.

The vehicle drive device (100) includes:
A rotating electric machine (1) as a driving force source for the wheels (W),
a parking lock mechanism (10) that selectively restricts rotation of a target rotating member (T) that rotates in conjunction with the wheel (W);
A vehicle drive device (100) comprising: a control device (20) that controls the rotating electric machine (1) and the parking lock mechanism (10);
The parking lock mechanism (10) has a lock position (P1) that engages with the target rotation member (T) to restrict rotation of the target rotation member (T), and a lock position (P1) that is spaced apart from the target rotation member (T). a locking member (4) movable to an unlocked position (P2) that allows rotation of the target rotating member (T); a drive device (5) for driving the locking member (4); and a drive device (5) for driving the locking member (4); A position detection device (8) that detects the position of the member (4),
The control device (20) is configured such that when the drive device (5) generates a driving force for moving the lock member (4) from the lock position (P1) to the unlocked position (P2), , when movement of the locking member (4) is not detected by the position detecting device (8), the locking member (4) and the target rotating member (T ) is executed to gradually increase the absolute value of the torque of the rotating electric machine (1) so as to weaken the engagement force with the rotary electric machine (1).

According to this configuration, even if the lock member (4) cannot be moved from the lock position (P1) to the unlocked position (P2) by the driving force of the drive device (5), the rotating electric machine ( Since the engagement force between the locking member (4) and the target rotating member (T) can be weakened using the torque of 1), the parking lock mechanism (10) can be brought into the unlocked state by the driving force of the driving device (5). can do. At this time, in order to gradually increase the torque of the rotating electrical machine (1) until movement of the locking member (4) is detected, the torque of the rotating electrical machine (1) is adjusted to an appropriate level for unlocking the parking lock mechanism (10). It becomes easy to set it as a value. This makes it possible to eliminate the need for various sensors for calculating the torque of the rotating electric machine (1) required to weaken the engagement force between the lock member (4) and the target rotating member (T). Therefore, in the configuration including the parking lock mechanism (10), it is easy to simplify the configuration and reduce the cost of the vehicle drive device (100).

Here, the control device (20)
If movement of the lock member (4) is detected by the position detection device (8) during execution of the lock release auxiliary process, a torque maintenance process of maintaining the torque of the rotating electric machine (1) constant; Run
When the rotation of the rotating electric machine (1) is detected during execution of the torque maintenance process, or when the locking member (4) reaches the unlocked position (P2) by the position detection device (8). If detected, it is preferable to execute a termination process in which the absolute value of the torque of the rotating electric machine (1) is gradually reduced.

According to this configuration, the absolute value of the torque of the rotating electrical machine (1) increases excessively in the lock release assisting process, and the engagement force between the locking member (4) and the target rotating member (T) increases instead. It is possible to prevent the movement of the lock member (4) from being hindered. Furthermore, since the rotating electric machine (1) continues to output torque even after the parking lock mechanism (10) is unlocked, it is possible to avoid transmitting unnecessary torque to the wheels (W).

In a configuration in which the control device (20) can execute the torque maintenance process,
The control device (20) controls the movement of the lock member (4) when the position detection device (8) no longer detects movement of the lock member (4) during execution of the torque maintenance process. It is preferable to perform an additional auxiliary process of gradually increasing the absolute value of the torque of the rotating electrical machine (1) so as to weaken the engagement force between the locking member (4) and the target rotating member (T) until the locking member (4) and the target rotating member (T) are detected. be.

According to this configuration, even if the locking member (4) stops moving due to insufficient torque of the rotating electrical machine (1) during the torque maintenance process, the rotating electrical machine (1) can be It becomes easy to set the torque to an appropriate value for the movement of the locking member (4).

In a configuration in which the control device (20) can execute the additional auxiliary processing,
The rate of increase in the absolute value of the torque of the rotating electrical machine (1) during the execution of the additional auxiliary process is lower than the rate of increase in the absolute value of the torque of the rotating electrical machine (1) during the execution of the unlocking auxiliary process. and is suitable.

According to this configuration, the absolute value of the torque of the rotating electrical machine (1) increases excessively in the additional auxiliary process, and the engagement force between the locking member (4) and the target rotating member (T) increases, which causes the locking This prevents the movement of the member (4) from being hindered.

Further, the drive device (5) includes:
A permanent magnet (61) supported by the locking member (4) is provided, and the locking member (4) is moved between the locked position (P1) and the unlocked position (P2) by the magnetic force of the permanent magnet (61). a position holding part (6) that holds the position in each position;
The electromagnetic force generated by the power from the power source causes the locking member (4) to move from the unlocked position (P2) to the locked position (P1), and to move the locking member (4) to the locked position ( It is preferable to include an electromagnetic drive unit (7) that moves from the unlocked position (P1) to the unlocked position (P2).

Although the drive device (5) configured in this way can suppress power consumption to a low level, the driving force for driving the locking member (4) is often insufficient. However, as described above, even if the lock member (4) cannot be moved from the lock position (P1) to the unlocked position (P2) by the driving force of the drive device (5), the rotating electric machine ( Since the engagement force between the lock member (4) and the target rotating member (T) can be weakened using the torque of 1), the drive device (5) having this configuration can be used.

The technology according to the present disclosure can be used in a vehicle drive device that includes a rotating electric machine as a driving force source for wheels and a parking lock mechanism that selectively restricts rotation of a target rotating member that rotates in conjunction with the wheels. can do.

100: Vehicle drive device, 1: Rotating electric machine, 4: Lock member, 5: Drive device, 6: Position holding unit, 61: Permanent magnet, 7: Electromagnetic drive unit, 8: Position detection device, 10: Parking lock mechanism , 20: Control device, T: Target rotating member, W: Wheel, P1: Lock position, P2: Unlock position

Claims

A rotating electric machine as a driving force source for the wheels,
a parking lock mechanism that selectively restricts rotation of a target rotating member that rotates in conjunction with the wheel;
A vehicle drive device comprising: a control device for controlling the rotating electric machine and the parking lock mechanism;
The parking lock mechanism has a lock position in which it engages with the target rotation member to restrict rotation of the target rotation member, and an unlocked position in which it is separated from the target rotation member and allows rotation of the target rotation member. comprising a movable lock member, a drive device that drives the lock member, and a position detection device that detects the position of the lock member,
The control device is configured to detect a case where movement of the lock member is not detected by the position detection device when the drive device is generating a driving force for moving the lock member from the lock position to the unlocked position. The vehicle further comprises: executing an unlock assisting process of gradually increasing the absolute value of the torque of the rotating electrical machine so as to weaken the engagement force between the locking member and the target rotating member until movement of the locking member is detected; drive unit.
The control device includes:
If movement of the locking member is detected by the position detection device during execution of the lock release assisting process, executing a torque maintenance process to maintain the torque of the rotating electric machine constant;
When the rotation of the rotating electrical machine is detected during the execution of the torque maintenance process, or when the position detection device detects that the locking member has reached the unlocked position, the rotation of the rotating electrical machine is detected. The vehicle drive system according to claim 1, wherein the vehicle drive system executes a termination process that gradually reduces the absolute value of the torque.
If movement of the locking member is no longer detected by the position detection device during execution of the torque maintenance process, the control device controls the locking member and the target rotation until movement of the locking member is detected. The vehicle drive device according to claim 2, wherein additional auxiliary processing is executed to gradually increase the absolute value of the torque of the rotating electric machine so as to weaken the engagement force with the member.
According to claim 3, the rate of increase in the absolute value of the torque of the rotating electrical machine during execution of the additional auxiliary process is lower than the rate of increase in the absolute value of the torque of the rotating electrical machine during execution of the unlocking auxiliary process. drive unit for vehicles.
The drive device includes:
a position holding part comprising a permanent magnet supported by the locking member, and holding the locking member in each of the locked position and the unlocked position by the magnetic force of the permanent magnet;
an electromagnetic drive unit that moves the locking member from the unlocked position to the locked position and moves the locking member from the locked position to the unlocked position using electromagnetic force generated by electric power from a power source; The vehicle drive device according to any one of claims 1 to 4, comprising: