Drive control system for electric motor and method of controlling electric motor
First Claim
1. A drive control system for an electric motor, comprising:
- an electronic control unit programmed to;
determine whether a drive wheel of a vehicle slips, the determination that the drive wheel slips being maintained for a predetermined period of time after the drive wheel slips;
calculate a tentative vibration damper torque to reduce a variation component of a rotational speed of one ofa drive axle mechanically connected to the drive wheel, andthe electric motor mounted in the vehicle as a drive source;
set a limit value to limit the vibration damper torque to reduce the variation component of the rotational speed of one of the drive axle and the electric motor, the limit value including a positive vibration damper torque limit value and a negative vibration damper torque limit value based upon rotational vibration of the drive axle, the electric motor or both;
for the predetermined period of time after the determination that the drive wheel slips, reduce the limit value of the positive vibration damper torque limit value or the negative vibration damper torque limit value that is in a same direction as a rotational direction of the drive axle, the electric motor or both;
set a control torque obtained by limiting the tentative vibration damper torque using the limit value; and
control driving of the electric motor in accordance with a command value of a torque obtained by combining a requested torque for the electric motor with the control torque so that an amount of the vibration damper torque applied to the one of the drive axle and the electric motor in the same direction as the rotational direction of the one of the drive axle and the electric motor is reduced.
1 Assignment
0 Petitions
Accused Products
Abstract
A drive control system for an electric motor includes a slippage determination device, a tentative vibration damper torque calculator, a vibration damper torque limit value setting device, a vibration damper torque setting device, and a control device. The vibration damper torque setting device is configured to set a control torque obtained by limiting a tentative vibration damper torque using a limit value set by the vibration damper torque limit value setting device. The control device is configured to control driving of the electric motor in accordance with a command value of a torque obtained by combining a requested torque for the electric motor with the control torque set by the vibration damper torque setting device.
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Citations
19 Claims
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1. A drive control system for an electric motor, comprising:
an electronic control unit programmed to; determine whether a drive wheel of a vehicle slips, the determination that the drive wheel slips being maintained for a predetermined period of time after the drive wheel slips; calculate a tentative vibration damper torque to reduce a variation component of a rotational speed of one of a drive axle mechanically connected to the drive wheel, and the electric motor mounted in the vehicle as a drive source; set a limit value to limit the vibration damper torque to reduce the variation component of the rotational speed of one of the drive axle and the electric motor, the limit value including a positive vibration damper torque limit value and a negative vibration damper torque limit value based upon rotational vibration of the drive axle, the electric motor or both; for the predetermined period of time after the determination that the drive wheel slips, reduce the limit value of the positive vibration damper torque limit value or the negative vibration damper torque limit value that is in a same direction as a rotational direction of the drive axle, the electric motor or both; set a control torque obtained by limiting the tentative vibration damper torque using the limit value; and control driving of the electric motor in accordance with a command value of a torque obtained by combining a requested torque for the electric motor with the control torque so that an amount of the vibration damper torque applied to the one of the drive axle and the electric motor in the same direction as the rotational direction of the one of the drive axle and the electric motor is reduced. - View Dependent Claims (2, 3, 4, 5, 10)
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6. A drive control system for an electric motor, comprising:
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slippage determination means for determining whether a drive wheel of a vehicle slips, the slippage determination means maintains the determination that the drive wheel slips for a predetermined period of time after the drive wheel slips; tentative vibration damper torque calculating means for calculating a tentative vibration damper torque to reduce a variation component of a rotational speed of one of a drive axle mechanically connected to the drive wheel, and the electric motor mounted in the vehicle as a drive source; vibration damper torque limit value setting means for setting a limit value to limit the vibration damper torque to reduce the variation component of rotational speed of one of the drive axle and the electric motor, the limit value including a positive vibration damper torque limit value and a negative vibration damper torque limit value based upon rotational vibration of the drive axle, the electric motor or both, wherein the vibration damper torque limit value setting means, for the predetermined period of time after the determination that the drive wheel slips, reduces the limit value of the positive vibration damper torque limit value or the negative vibration damper torque limit value that is in a same direction as a rotational direction of the drive axle, the electric motor or both; vibration damper torque setting means for setting a control torque obtained by limiting the tentative vibration damper torque using the limit value set by the vibration damper torque limit value setting means; and control means for controlling driving of the electric motor in accordance with a command value of a torque obtained by combining a requested torque for the electric motor with the control torque set by the vibration damper torque setting means so that an amount of the vibration damper torque applied to the one of the drive axle and the electric motor in the same direction as the rotational direction of the one of the drive axle and the electric motor is reduced. - View Dependent Claims (15)
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7. A method of controlling an electric motor, the method comprising:
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determining whether a drive wheel of a vehicle slips; maintaining the determination that the drive wheel slips for a predetermined period of time after the drive wheel slips; calculating a tentative vibration damper torque to reduce a variation component of a rotational speed of one of a drive axle mechanically connected to the drive wheel, and the electric motor mounted in the vehicle as a drive source; setting a limit value to limit the vibration damper torque to reduce the variation component of rotational speed of one of the drive axle and the electric motor, the limit value including a positive vibration damper torque limit value and a negative vibration damper torque limit value based upon rotational vibration of the drive axle, the electric motor or both; for the predetermined period of time after the determination that the drive wheel slips, reducing the limit value of the positive vibration damper torque limit value or the negative vibration damper torque limit value that is in a same direction as a rotational direction of the drive axle, the electric motor or both; setting a control torque obtained by limiting the tentative vibration damper torque using the limit value; and controlling driving of the electric motor in accordance with a command value of a torque obtained by combining a requested torque for the electric motor with the control torque so that an amount of the vibration damper torque applied to the one of the drive axle and the electric motor in the same direction as the rotational direction of the one of the drive axle and the electric motor is reduced.
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8. A drive control system for an electric motor, comprising:
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an electronic control unit programmed to; determine whether a drive wheel of a vehicle slips, the determination that the drive wheel slips being maintained for a predetermined period of time after the drive wheel slips; calculate a tentative vibration damper torque to reduce a variation component of a rotational speed of one of a drive axle mechanically connected to the drive wheel, and the electric motor mounted in the vehicle as a drive source; set, for the predetermined period of time after the determination that the drive wheel slips, a limit value to limit a vibration damper torque that increases an absolute value of the rotational speed of the electric motor or the drive axle; set a control torque obtained by limiting the tentative vibration damper torque using the limit value; and control driving of the electric motor in accordance with a command value of a torque obtained by combining a requested torque for the electric motor with the control torque, wherein the predetermined period of time is set in accordance with a resonance frequency of rotational fluctuation caused by torsion of the drive axle. - View Dependent Claims (9)
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11. A drive control system for an electric motor, comprising:
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an electronic control unit programmed to; determine whether a drive wheel of a vehicle slips, the determination that the drive wheel slips being maintained for a predetermined period of time after the drive wheel slips; calculate a tentative vibration damper torque to reduce a variation component of a rotational speed of one of a drive axle mechanically connected to the drive wheel, and the electric motor mounted in the vehicle as a drive source; set, for the predetermined period of time after the determination that the drive wheel slips, a limit value to limit a vibration damper torque that increases an absolute value of the rotational speed of the electric motor or the drive axle; set a control torque obtained by limiting the tentative vibration damper torque using the limit value; and control driving of the electric motor in accordance with a command value of a torque obtained by combining a requested torque for the electric motor with the control torque, wherein the vibration damper torque limit value setting device is configured to set a positive limit value and a negative limit value of the vibration damper torque as the limit value, wherein the vibration damper torque setting device is configured to limit the tentative vibration damper torque within a range from the positive limit value to the negative limit value, and wherein the positive limit value to the negative limit value are set on a basis of a shift position of a gear shift operation unit of the vehicle. - View Dependent Claims (12)
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13. A drive control system for an electric motor, comprising:
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slippage determination means for determining whether a drive wheel of a vehicle slips, the slippage determination means maintains the determination that the drive wheel slips for a predetermined period of time after the drive wheel slips; tentative vibration damper torque calculating means for calculating a tentative vibration damper torque to reduce a variation component of a rotational speed of one of a drive axle mechanically connected to the drive wheel, and the electric motor mounted in the vehicle as a drive source; vibration damper torque limit value setting means for setting, for the predetermined period of time after the slippage determination means determines that the drive wheel slips, a limit value to limit a vibration damper torque that increases an absolute value of the rotational speed of the electric motor or the drive axle; vibration damper torque setting means for setting a control torque obtained by limiting the tentative vibration damper torque using the limit value set by the vibration damper torque limit value setting means; and control means for controlling driving of the electric motor in accordance with a command value of a torque obtained by combining a requested torque for the electric motor with the control torque set by the vibration damper torque setting means, wherein the predetermined period of time is set in accordance with a resonance frequency of rotational fluctuation caused by torsion of the drive axle. - View Dependent Claims (14)
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16. A drive control system for an electric motor, comprising:
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slippage determination means for determining whether a drive wheel of a vehicle slips, the slippage determination means maintains the determination that the drive wheel slips for a predetermined period of time after the drive wheel slips; tentative vibration damper torque calculating means for calculating a tentative vibration damper torque to reduce a variation component of a rotational speed of one of a drive axle mechanically connected to the drive wheel, and the electric motor mounted in the vehicle as a drive source; vibration damper torque limit value setting means for setting, for the predetermined period of time after the slippage determination means determines that the drive wheel slips, a limit value to limit a vibration damper torque that increases an absolute value of the rotational speed of the electric motor or the drive axle; vibration damper torque setting means for setting a control torque obtained by limiting the tentative vibration damper torque using the limit value set by the vibration damper torque limit value setting means; and control means for controlling driving of the electric motor in accordance with a command value of a torque obtained by combining a requested torque for the electric motor with the control torque set by the vibration damper torque setting means, wherein the vibration damper torque limit value setting means is configured to set a positive limit value and a negative limit value of the vibration damper torque as the limit value, wherein the vibration damper torque setting means is configured to limit the tentative vibration damper torque within a range from the positive limit value to the negative limit value, and wherein the positive limit value to the negative limit value are set on a basis of a shift position of a gear shift operation unit of the vehicle. - View Dependent Claims (17)
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18. A method of controlling an electric motor, the method comprising:
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determining whether a drive wheel of a vehicle slips; maintaining the determination that the drive wheel slips for a predetermined period of time after the drive wheel slips; calculating a tentative vibration damper torque to reduce a variation component of a rotational speed of one of a drive axle mechanically connected to the drive wheel, and the electric motor mounted in the vehicle as a drive source; setting, for the predetermined period of time after it is determined that the drive wheel slips, a limit value to limit a vibration damper torque that increases an absolute value of the rotational speed of the electric motor or the drive axle; setting a control torque obtained by limiting the tentative vibration damper torque using the limit value; and controlling driving of the electric motor in accordance with a command value of a torque obtained by combining a requested torque for the electric motor with the control torque, wherein the predetermined period of time is set in accordance with a resonance frequency of rotational fluctuation caused by torsion of the drive axle. - View Dependent Claims (19)
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Specification