JP2016213913A - Drive control device for vehicle drive motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive control device for vehicle drive motor capable of exerting necessary and sufficient functions regarding lubrication of a part to be lubricated and a cooling structure, without making the structure complex.SOLUTION: A drive control device 20 for vehicle drive motor controls a motor 6 of a vehicle which includes: the motor 6 for vehicle drive; a speed reducer for reducing the rotation speed of the motor 6 and transmitting it to wheels; and an oil feeding mechanism for supplying a lubrication oil to the motor 6 and the speed reducer by the rotation of the motor in one direction. Determination means 24 is provided which, at the vehicle retreating time during which the motor 6 rotates in the other direction, counts the rotational frequency of the motor 6, and determines whether or not the rotational frequency exceeds an upper limit of the preset rotational frequency. Motor output stop means 29 is provided which stops the output of the motor 6, when it is determined that the rotational frequency of the motor 6 has exceeded the upper limit of the preset rotational frequency by the determination means 24.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a drive control device for a motor for driving a vehicle, and relates to a technique capable of exhibiting necessary and sufficient functions for a lubrication and cooling structure of a lubricated portion without complicating the structure.

  An in-wheel motor (hereinafter referred to as “IWM”) including a motor, a speed reducer, and a wheel bearing disposed in a wheel incorporates a rotary oil pump (for example, a trochoid oil pump), and has an output shaft. Oil lubrication inside the IWM is carried out using rotation. The trochoid oil pump has a mechanism in which the direction of discharge of the lubricating oil is switched according to the rotation direction of the pump.

JP 2008-087713 A JP 2009-293779 A Japanese Patent No. 5176673

  The IWM using a rotary oil pump such as a trochoid type has an oil passage design that enables lubrication inside the IWM in the forward traveling state of the vehicle. However, in the reverse traveling (back traveling) state, the pump discharges the lubricating oil. Becomes impossible, and the lubricating oil cannot be fed into the IWM, resulting in an oil-free state.

  The prior art has an in-wheel motor lubrication oil supply mechanism, and the motor is used as the power source of the lubrication oil supply mechanism, so the rotation direction is reversed between the vehicle forward direction and the reverse direction, and the reverse direction In response to the problem that the lubricated part cannot be efficiently lubricated and cooled, an additional structure such as adding a pump to the lubricating oil supply device, devising the pump structure, or adding a clutch mechanism may be provided. It has been proposed (Patent Documents 1 to 3). Such a coping method is complicated because the incidental structure is provided, and the cost is high.

  An object of the present invention is to provide a drive control device for a vehicle drive motor that can exhibit necessary and sufficient functions for a lubrication and cooling structure of a lubricated part without complicating the structure.

The vehicle drive motor drive control device 20 of the present invention includes a vehicle drive motor 6, a speed reducer 7 that decelerates the rotation of the motor 6 and transmits the rotation to the wheels 2, and rotation of the motor 6 in one direction. A drive control device 20 for a vehicle drive motor for controlling the motor 6 of a vehicle provided with a motor 6 and an oil supply mechanism Jk for supplying lubricating oil to the speed reducer 7,
A determination unit 24 that counts the number of rotations of the motor 6 when the vehicle is moving backward in the other direction of the motor 6 and determines whether the number of rotations exceeds an upper limit value of the set number of rotations;
When the determination means 24 determines that the number of rotations of the motor 6 has exceeded the upper limit value of the set number of rotations, a motor output stop means 29 for stopping the output of the motor 6 is provided.
As the upper limit value of the number of rotations, for example, the number of rotations is set to such a degree that there is no practical problem depending on the results of tests and simulations.

  According to this configuration, the vehicle moves forward by decelerating the rotation of the motor 6 in one direction (vehicle forward side) by the speed reducer 7 and transmitting it to the wheels 2 by an accelerator operation or the like by the driver. The oil supply mechanism Jk supplies lubricating oil to the motor 6 and the speed reducer 7 that are lubricated parts by rotating the motor 6 in one direction. As a result, the motor 6 is cooled, and the speed reducer 7 is lubricated and cooled. The determination means 24 counts the number of rotations of the motor 6 when the vehicle is moving backward in the other direction of the motor 6, and determines whether or not the counted number of rotations exceeds an upper limit value of the set number of rotations. The rotation of the motor 6 in the other direction is a rotation opposite to the rotation of the motor 6 in one direction, and the vehicle 2 does not have to actually move backward due to the wheel 2 slipping or the like. .

  When it is determined that the counted number of rotations exceeds the upper limit value of the set number of rotations, the motor output stop unit 29 stops the output of the motor 6. As described above, when the number of rotations of the motor 6 exceeds the upper limit value when the vehicle 6 is not supplied with the lubricating oil to the motor 6 and the speed reducer 7, the motor output to the vehicle backward side is prevented so that the motor 6 does not rotate in the other direction. By forcibly stopping, overheating of the motor 6 can be suppressed, and the reduction gear 7 can be prevented from operating in an undesired lubrication state. Therefore, the lubrication and cooling structure of the motor 6 and the speed reducer 7 can exhibit necessary and sufficient functions without complicating the structure as compared with the prior art that provides the incidental structure.

  Even if the determination means 24 determines that the number of rotations of the motor 6 when the vehicle moves backward exceeds the upper limit value of the set number of rotations, the motor output stop means 29 is one of the motors 6 even when the motor output is stopped. You may allow the output of the said motor 6 to the vehicle advance side which is rotation of a direction. When the motor 6 rotates in one direction, the oil supply mechanism Jk supplies lubricating oil to the motor 6 and the speed reducer 7, so that the output of the motor 6 may be allowed. Thus, the convenience can be improved by always allowing the output of the motor 6 to the vehicle forward side.

When the determination means 24 determines that the number of rotations of the motor 6 when the vehicle moves backward exceeds the upper limit value of the set number of rotations, only when the motor 6 becomes equal to or higher than the rotation speed set on the vehicle forward side. Rotational frequency clearing means 25 may be provided for clearing the number of rotations of the motor 6 counted when the vehicle is moving backward and returning the output of the motor 6 to the vehicle backward side.
The set rotation speed or higher is set, for example, based on the result of a test or simulation.

  When the motor 6 exceeds the rotational speed set on the vehicle forward side, the lubricating oil can be sufficiently supplied to the motor 6 and the speed reducer 7. This is because the rotational speed of the motor 6 on the vehicle forward side and the flow rate of the lubricating oil supplied by the oil supply mechanism Jk are in a proportional relationship. When satisfying such a good lubrication condition, the rotation number clearing means 25 clears the counted number of rotations of the motor 6 to zero, and returns the output of the motor 6 to the vehicle reverse side, so that the motor 6 and It is possible to achieve a balance between necessary and sufficient functions for the lubrication and cooling structure of the speed reducer 7 and practical convenience.

  The motor 6 may be partly or wholly disposed in a wheel to constitute the in-wheel motor drive device IWM including the motor 6, the wheel bearing 4, and the speed reducer 7. In this case, the cost can be reduced without complicating the structure of the in-wheel motor drive device IWM as compared with the prior art, and the motor 6 and the speed reducer 7 can exhibit necessary and sufficient functions for the lubrication and cooling structure.

  The drive control device for a vehicle drive motor according to the present invention includes a vehicle drive motor, a speed reducer that decelerates the rotation of the motor and transmits it to the wheels, and a rotation of the motor in one direction to the motor and the speed reducer. A drive control device for a vehicle drive motor for controlling the motor of a vehicle having an oil supply mechanism for supplying lubricating oil, wherein the number of rotations of the motor is determined when the motor is moving backward in the other direction of the motor. Counting and determining means for determining whether or not the number of rotations exceeds the upper limit value of the set number of rotations, By this determination means, when determining that the number of rotations of the motor exceeds the upper limit value of the set number of rotations, Motor output stopping means for stopping the output of the motor is provided. For this reason, it is possible to exhibit necessary and sufficient functions for the lubrication and cooling structure of the lubricated part without complicating the structure.

1 is a block diagram of a conceptual configuration showing, in plan view, an electric vehicle equipped with a vehicle drive motor drive control device according to an embodiment of the present invention. It is sectional drawing of the in-wheel motor drive device in the same electric vehicle. It is the figure which looked at the pump of the oil supply mechanism of the in-wheel motor drive device from the axial direction. It is a block diagram of a control system of the drive control device. It is a flowchart of the ON / OFF process of the drive control apparatus. It is a flowchart which shows the motor rotation frequency counter process of the drive control apparatus. It is a block diagram of a conceptual structure which shows the electric vehicle carrying the drive control apparatus of the vehicle drive motor which concerns on other embodiment of this invention with a top view. It is a block diagram of a conceptual structure which shows the electric vehicle carrying the drive control apparatus of the vehicle drive motor which concerns on further another embodiment of this invention with a top view.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram of a conceptual configuration showing, in plan view, an electric vehicle equipped with a vehicle drive motor drive control device according to this embodiment. This electric vehicle is a four-wheeled vehicle in which the wheels 2 that are the left and right rear wheels of the vehicle body 1 are drive wheels and the wheels 3 that are the left and right front wheels are driven wheels. The front wheel 3 is a steering wheel. The left and right wheels 2 and 2 serving as driving wheels are driven by independent traveling motors 6. Each motor 6 constitutes an in-wheel motor drive device IWM described later. Each wheel 2 and 3 is provided with a brake (not shown). Further, the wheels 3 and 3 which are the left and right front wheels can be steered via a steering mechanism (not shown) and are steered by a steering means 15 such as a steering wheel.

  FIG. 2 is a cross-sectional view of the in-wheel motor drive device IWM in this electric vehicle. Each in-wheel motor drive device IWM has a motor 6, a speed reducer 7, a wheel bearing 4, and an oil supply mechanism (not shown) to be described later, and a part or all of these are arranged in the wheel. . The rotation of the motor 6 is transmitted to the drive wheel 2 via the speed reducer 7 and the wheel bearing 4. A brake rotor 5 constituting the brake is fixed to a flange portion of the hub wheel 4 a of the wheel bearing 4, and the brake rotor 5 rotates integrally with the drive wheel 2. The motor 6 is, for example, an embedded magnet type synchronous motor in which a permanent magnet is built in the core portion of the rotor 6a. This motor 6 is a motor in which a radial gap is provided between a stator 6 b fixed to the housing 8 and a rotor 6 a attached to the rotation output shaft 9.

The oil supply mechanism will be described.
As shown in FIGS. 2 and 3, the oil supply mechanism Jk is a so-called shaft center oil supply mechanism that supplies lubricating oil used for cooling the motor 6 and lubricating and cooling the speed reducer 7 from the inside of the rotary output shaft 9. The oil supply mechanism Jk includes a pump 27, a lubricating oil storage unit 10, and a plurality of oil passages 11. The pump 27 and the lubricating oil reservoir 10 are each provided in the housing 8. The pump 27 sucks up the lubricating oil stored in the lubricating oil reservoir 10 from the lubricating oil reservoir 10 and circulates it through the plurality of oil passages 11.

  As shown in FIG. 3, the pump 27 includes an inner rotor 40 that rotates as the output member 12 rotates, an outer rotor 41 that rotates following the rotation of the inner rotor 40, a pump chamber 42, and a suction port 43. , A cycloid pump having a discharge port 44. The inner rotor 40 is configured to be rotated by the rotation of the output member 12. When the inner rotor 40 is rotated by the rotation of the output member 12 driven by the motor 6, the outer rotor 41 is driven to rotate. At this time, the inner rotor 40 and the outer rotor 41 rotate about different rotation centers c1 and c2, respectively, so that the volume of the pump chamber 42 changes continuously. As a result, the lubricating oil stored in the lubricating oil reservoir 10 is sucked up, flows in from the suction port 43, and is sequentially pumped from the discharge port 44 to the plurality of oil passages.

  In this electric vehicle, the lubricating oil pumped into the rotation output shaft 9 when the vehicle moves forward, that is, when the motor 6 rotates in one direction, is one of the lubricating oils due to the centrifugal force of the rotor 6 a and the pressure of the pump 27. The part is guided to the motor 6 to cool the motor 6. The lubricating oil used for this cooling moves downward due to gravity, falls to the lower part of the housing 8, and is then stored in the lubricating oil storage part 10 communicating with the lower part of the housing 8. Further, when the electric vehicle moves forward, the remaining lubricating oil that is pumped into the rotary output shaft 9 and is not used for cooling the motor 6 is guided into the speed reducer 7 by centrifugal force and the pressure of the pump 21. Then, each part in the speed reducer 7 is lubricated and cooled. The lubricating oil provided for this lubrication or the like moves downward due to gravity and is stored in the lubricating oil reservoir 10 via an oil discharge port (not shown).

The control system will be described.
FIG. 4 is a block diagram of a control system of the drive control device 20 for the vehicle drive motor. In the following description, FIG. 1 is also referred to as appropriate.
The drive control device 20 includes an ECU 21 and an inverter device 22. The ECU 21 and the inverter device 22 are mounted on the vehicle body 1 of the electric vehicle. The ECU 21 is a higher-level control unit that performs overall control of the entire automobile and gives a command to the inverter device 22. Although only one inverter device 22 is shown in FIG. 4, each inverter device 22 is provided for each motor 6. Each inverter device 22 controls each traveling motor 6 according to a command from the ECU 21. The ECU 21 includes a computer, a program executed by the computer, various electronic circuits, and the like.

  The ECU 21 includes a command torque calculation unit 23, a determination unit 24, and a rotation number clear unit 25. The command torque calculation unit 23 generates an acceleration command to be given to each motor 6 as a command torque from the signal of the accelerator sensor 16a that detects the operation amount of the accelerator operation unit 16. The ECU 21 outputs the calculated command torque to each inverter device 22 so as to distribute it to each motor 6.

  The determination unit 24 includes a rotation number counting unit 24a and a determination unit 24b. The number-of-rotations counter 24a counts the number of rotations of the motor 6 when the vehicle moves backward, that is, when the motor 6 rotates in the other direction. The rotation number counting unit 24a detects the rotation direction of the motor 6 based on, for example, the sign of the rotation sensor Sa.

  The rotation of the motor 6 in the other direction is a rotation opposite to the rotation of the motor 6 in one direction, and the vehicle 2 does not have to actually move backward due to the wheel 2 slipping or the like. . In this example, the number of rotations of the motor 6 is calculated from a distance obtained by multiplying the motor rotation number (so-called rotation speed) obtained from the rotation sensor Sa provided in the motor 6 by the time for which the motor 6 rotates in the other direction. ing. However, for example, the number of rotations of the motor 6 may be calculated from a distance obtained by multiplying the number of times of rotation of the driven wheel detected by a rotation sensor (not shown) provided on the driven wheel by the time for which the motor 6 rotates in the other direction. .

  The determination unit 24b determines whether or not the number of rotations of the motor 6 obtained by the rotation number counting unit 24a has exceeded a preset upper limit value of the number of rotations. When the determination unit 24b determines that the number of rotations exceeds the set upper limit value during rotation in the other direction of the motor 6, the motor output stop means 29 in the motor control unit 28 described later stops the output of the motor 6. To do.

  The inverter device 22 includes a power circuit unit 30 provided for each motor 6 and a motor control unit 28 that controls the power circuit unit 30. The power circuit unit 30 includes an inverter 30a and a PWM driver 30b that drives the inverter 30a. The inverter 30 a converts the DC power of the battery 19 into three-phase AC power used for driving the motor 6. The inverter 30a is composed of a plurality of semiconductor switching elements (not shown), and the PWM driver 30b drives the inverter 30a based on an on / off command. The semiconductor switching element includes, for example, an insulated gate bipolar transistor (IGBT).

  The motor control unit 28 includes a motor drive control unit 31 as a basic control unit. The motor drive control unit 31 converts it into a current command and performs pulse width modulation in accordance with an acceleration command based on a command torque given from the ECU 21 which is a host control means, and gives an on / off command to the PWM driver 30b. The motor drive control unit 31 obtains a motor current flowing from the inverter 30a to the motor 6 from the current detection unit Sb, and performs current feedback control. Further, the motor drive control unit 31 obtains the rotation angle of the rotor 6a (FIG. 2) of the motor 6 from the rotation sensor Sa and performs vector control. As the rotation sensor Sa, for example, a resolver, a GMR sensor, or the like can be applied.

  The motor control unit 28 is provided with motor output stopping means 29. When the motor output stopping unit 29 determines that the number of rotations exceeds the set upper limit value during rotation in the other direction of the motor 6 by the determination unit 24b, for example, the current detected by the current detection unit Sb is The command torque is limited to zero. The motor output stopping unit 29 receives the determination result that the determination unit 24b has exceeded the upper limit value, and drives the motor so that the current command to the inverter 30a becomes zero regardless of the detection value of the current detection unit Sb. The power circuit unit 30 may be commanded via the control unit 31.

  Even if the determination unit 24b determines that the number of rotations of the motor 6 at the time of reverse of the vehicle has exceeded the upper limit value of the set number of rotations, the motor output stop means 29 is directed to the vehicle forward side that is one-way rotation of the motor 6. The output of the motor 6 is allowed. Specifically, when the driver operates the shift lever 26 to the operation position on the vehicle forward side such as the D drive while the motor output stop means 29 stops the output of the motor 6 to the vehicle backward side, the determination unit 24b instructs the motor output stopping means 29 to cancel the output stop of the motor 6. When the driver operates the accelerator operation unit 16 in this state, the ECU 21 outputs the command torque calculated by the command torque calculation unit 23 to each inverter device 22 so as to be distributed to each motor 6 as usual.

When the following condition is satisfied, the rotation number clear means 25 of the ECU 21 clears the rotation number of the motor 6 counted when the vehicle is moving backward, and returns the output of the motor 6 to the vehicle backward side.
Condition: When the determination unit 24b determines that the number of rotations of the motor 6 when the vehicle moves backward exceeds an upper limit value of the number of rotations set in advance, the rotation direction of the motor 6 is determined based on the sign of the rotation sensor Sa. The rotation speed obtained from the rotation sensor Sa provided in the motor 6 is equal to or higher than the set rotation speed.

  When the rotational speed is higher than the rotational speed set on the vehicle forward side of the motor 6, the lubricating oil can be sufficiently supplied from the oil supply mechanism Jk (FIG. 3) to the motor 6 and the speed reducer 7. This is because the rotational speed of the motor 6 on the vehicle forward side and the flow rate of the lubricating oil are in a proportional relationship. When satisfying such a good lubrication condition, the rotation number clearing means 25 gives a command to clear the rotation number of the motor 6 to the rotation number counting unit 24a. The determination unit 24b gives a command for returning the output of the motor 6 to the vehicle reverse side to the motor output stop means 29 from the cleared number of rotations given from the rotation number counting unit 24a.

FIG. 5 is a flowchart of ON / OFF processing of this drive control device. Hereinafter, a description will be given with reference to FIG.
For example, after the main power supply (not shown) of the vehicle is turned on, this process is started, and the determination means 24 determines whether the command to each motor 6 is “forward”, “stop” or “reverse” from the operation position of the shift lever 26. (Step a1). If it is determined as “forward”, the ECU 21 outputs the command torque calculated by the command torque calculation unit 23 to each inverter device 22 so as to be distributed to each motor 6 to drive the motor 6 forward (step a2). . When the operation position of the shift lever 26 is N neutral, the ECU 21 turns off the motor output (step a3). Thereafter, this process is terminated.

  When the determination unit 24 determines “reverse” from the operation position of the shift lever 26, the determination unit 24b determines whether the number of rotations of the motor 6 counted by the rotation number counting unit 24a exceeds the upper limit value of the set number of rotations. (Step a4). If it is determined that the upper limit value has been exceeded (step a4: Yes), the motor output is turned off by the motor output stop means 29 (step a5). When the determination unit 24b determines that the counted number of rotations of the motor does not exceed the upper limit value of the set number of rotations (step a4: No), the ECU 21 retracts the motor 6 via the inverter device 22 according to the command torque. Drive (step a6). Thereafter, this process is terminated.

FIG. 6 is a flowchart showing a motor rotation number counter process of the drive control device.
After the start of this process, the determination means 24 of the ECU 21 determines whether the rotation direction of the motor 6 is “forward”, “stop”, or “reverse” based on the positive and negative signs of the rotation sensor Sa (step b1). When the determination unit 24 determines “forward”, the rotation number clearing unit 25 determines whether or not the motor 6 has reached or exceeds the rotation speed set on the vehicle forward side (step b2). When the rotation speed of the motor 6 is less than the set rotation speed (step b2: No), this process is terminated.

  When the rotation speed of the motor 6 is equal to or higher than the set rotation speed (step b2: Yes), the rotation count clearing means 25 gives a command to clear the rotation count of the motor 6 to zero to the rotation count counter 24a (step b3). . Thereafter, this process is terminated. In step b1, when the determination unit 24 determines “stop”, the present process is terminated. When the determination unit 24 determines “reverse”, the rotation number counting unit 24a executes a count-up process (step b4). The number of rotations of the motor 6 counted in step b4 is used for determination in step a4 in FIG. Thereafter, this process is terminated.

  According to the vehicle drive motor drive control device 20 described above, the oil supply mechanism Jk supplies lubricating oil to the motor 6 and the speed reducer 7 by rotation in one direction of the motor 6 on the vehicle forward side. As a result, the motor 6 is cooled, and the speed reducer 7 is lubricated and cooled. The rotation number counting unit 24a counts the number of rotations of the motor 6 when the motor 6 rotates in the other direction, and the determination unit 24b determines whether or not the counted number of rotations exceeds an upper limit value of the set number of rotations. .

  When it is determined that the counted number of rotations of the motor 6 has exceeded the upper limit value of the set number of rotations, the motor output stopping means 29 stops the output of the motor 6. As described above, when the number of rotations of the motor 6 exceeds the upper limit value when the vehicle 6 is not supplied with the lubricating oil to the motor 6 and the speed reducer 7, the motor output to the vehicle backward side is prevented so that the motor 6 does not rotate in the other direction. By forcibly stopping, overheating of the motor 6 can be suppressed, and the reduction gear 7 can be prevented from operating in an undesired lubrication state. Therefore, the lubrication and cooling structure of the motor 6 and the speed reducer 7 can exhibit necessary and sufficient functions without complicating the structure as compared with the prior art that provides the incidental structure.

  Even if the determination means 24 determines that the number of rotations of the motor 6 at the time of reverse of the vehicle has exceeded the upper limit value of the set number of rotations and the motor output is stopped, the motor output stop means 29 is rotated in one direction of the motor 6. The output of the motor 6 to a certain vehicle forward side is allowed. When the motor 6 rotates in one direction, the oil supply mechanism Jk supplies lubricating oil to the motor 6 and the speed reducer 7, so that the output of the motor 6 may be allowed. Thus, the convenience can be improved by always allowing the output of the motor 6 to the vehicle forward side.

  When the motor 6 has reached or exceeds the rotational speed set on the vehicle forward side, the lubricating oil can be sufficiently supplied to the motor 6 and the speed reducer 7. This is because the rotational speed of the motor 6 on the vehicle forward side and the flow rate of the lubricating oil supplied by the oil supply mechanism Jk are in a proportional relationship. When satisfying such a good lubrication condition, the rotation number clearing means 25 clears the counted number of rotations of the motor 6 to zero, and returns the output of the motor 6 to the vehicle reverse side, so that the motor 6 and It is possible to achieve a balance between necessary and sufficient functions for the lubrication and cooling structure of the speed reducer 7 and practical convenience.

Another embodiment will be described.
In the following description, the same reference numerals are assigned to the portions corresponding to the matters described in the preceding forms in each embodiment, and overlapping descriptions are omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in advance unless otherwise specified. The same effect is obtained from the same configuration. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder.

In an in-wheel motor drive device, a cycloid type reduction gear, a planetary reduction gear, a two-axis parallel reduction gear, and other reduction gears can be applied. In the in-wheel motor drive device of the above-described embodiment, rear wheel drive is shown, but front wheel drive or four wheel drive may be used.
In the embodiment described above, an example in which the drive control device is applied to an electric vehicle equipped with an in-wheel motor drive device has been described. However, as shown in FIG. The vehicle drive motor drive control device 20 may be applied to a one-motor type electric vehicle that is provided and drives the left and right wheels 3, 3 by the one motor 6.

  As shown in FIG. 8, two motors 6, 6 and speed reducers 7, 7 corresponding to the motors 6 are provided on the vehicle body 1, and the two motors ON drive the left and right wheels 3, 3 by these motors 6, 6. The vehicle drive motor drive control device 20 may be applied to a board-type electric vehicle. 7 and 8, the left and right wheels driven by the motor 6 may be either the front or rear wheels 3 or 2. Also, four-wheel drive may be used.

In addition, for example, abnormality reporting means may be provided in the ECU 21 or the inverter device 22. This abnormality reporting means receives the determination result that the number of rotations of the motor by the determination unit 24b exceeds the upper limit value, and forcibly stops the motor output to the vehicle rearward side on the driver's seat display device or the like. Display.
In each embodiment, the rotation direction of the motor 6 is detected from the positive and negative signs of the rotation sensor Sa, but is not limited to this example. For example, the rotational direction of the motor 6 may be detected from the operation position of the shift lever 26.

  As mentioned above, although the form for implementing this invention based on embodiment was demonstrated, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 2 ... Wheel 4 ... Wheel bearing 6 ... Motor 7 ... Reduction gear 24 ... Determination means 25 ... Number of rotations clear means 29 ... Motor output stop means IWM ... In-wheel motor drive device Jk ... Oil supply mechanism

Claims (4)

A vehicle having a motor for driving a vehicle, a speed reducer that decelerates the rotation of the motor and transmits it to a wheel, and an oil supply mechanism that supplies lubricating oil to the motor and the speed reducer by rotation of the motor in one direction. A drive control device for a vehicle drive motor for controlling the motor,
Determination means for counting the number of rotations of the motor at the time of reverse of the vehicle that is rotating in the other direction of the motor and determining whether the number of rotations exceeds an upper limit value of the set number of rotations
When it is determined by this determination means that the number of rotations of the motor has exceeded the upper limit value of the set number of rotations, motor output stop means for stopping the output of the motor;
A drive control device for a vehicle drive motor, comprising:   2. The drive control device for a motor for driving a vehicle according to claim 1, wherein the motor output stop means even if the determination means determines that the number of rotations of the motor when the vehicle moves backward exceeds an upper limit value of the set number of rotations. These are the drive control apparatuses of the motor for a vehicle drive which accept | permit the output of the said motor to the vehicle advance side which is rotation of the said motor of one direction.   3. The drive control device for a vehicle drive motor according to claim 2, wherein when the determination means determines that the number of rotations of the motor at the time of reverse of the vehicle exceeds an upper limit value of the set number of rotations, the motor is moved forward of the vehicle. Only when the rotation speed exceeds the rotation speed set in step 1, the number of rotations of the motor counted during the reverse of the vehicle is cleared, and the number of rotations clearing means for returning the output of the motor to the reverse side of the vehicle is provided. Motor drive control device.   4. The vehicle drive motor drive control device according to claim 1, wherein a part or all of the motor is disposed in a wheel, and the motor, the wheel bearing, and the speed reducer are disposed. The drive control apparatus of the motor for vehicle drive which comprises the in-wheel motor drive device containing these.

Images