Damping control device for electric vehicle

Patent metadata

Field	Value
Publication number	US-10112617-B2
Application number	US-201515554792-A
Country	US
Kind code	B2
Filing date	Mar 20, 2015
Priority date	Mar 20, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A damping control device for an electric vehicle is having a continuously variable transmission between a motor and left and right front wheels. The damping control device drive system includes a feedback control unit, which suppresses a vibration accompanying a disturbance in the rotational speed of the motor, and an operation determination unit, which determines whether or not an absolute value of a second-order differential of the transmission ratio is equal to, or greater than, a predetermined value, wherein when the absolute value of the second-order differential of the transmission ratio is equal to, or greater than, the predetermined value. The feedback control unit performs control of the output torque of the motor whereby a compensation torque component for suppressing a vibration accompanying a gear shift is subtracted from a compensation torque.

First claim

The invention claimed is:

1. A damping control device for an electric vehicle having a transmission provided between a motor and drive wheels, the damping control device comprising:
a shift vibration suppression unit that subtracts a compensation torque component for suppressing vibration caused by shifting from a compensation torque for suppressing vibration caused by disturbance of a rotational speed of a motor to control an output torque of the motor; and
the damping control device comprising:
a transmission ratio second-order differentiation calculating unit that calculates a second-order differential of a transmission ratio of the transmission,
the shift vibration suppression unit carries out the control of the output torque of the motor, when an absolute value of the second-order differential is equal to or greater than a predetermined value.

2. The damping control device according to claim 1 , comprising:
a shift determination unit that determines a presence or absence of a change in the transmission ratio based on the second-order differential,
the shift vibration suppression unit carries out the control of the output torque of the motor, when the shift determination means determines that there is a change in the transmission ratio.

3. The damping control device according to claim 2 , further comprising:
a manual shifting mode determination unit that determines whether or not it is a manual shifting mode in which the transmission ratio is changed in a stepwise manner based on a shift request of a driver,
the shift vibration suppression unit carrying out a control of the output torque of the motor regardless of the value of the second-order differential, when shifting by the manual shifting mode.

4. The damping control device according to claim 1 , further comprising:
a working fluid temperature detection unit that detects a temperature of a working fluid of the transmission, wherein
the shift vibration suppression unit carrying out a control of the output torque of the motor, when the working fluid temperature is a predetermined temperature or higher.

5. The damping control device according to claim 1 , further comprising:
a predetermined value setting unit for setting the predetermined value smaller as the vehicle speed is increased.

6. The damping control device according to claim 1 , wherein
a predetermined value setting unit for setting the predetermined value smaller as a gear shift stage is lower with respect to the gear shift stage before shifting.

7. The damping control device according to claim 1 , wherein
the shift vibration suppression unit stops the control of the output torque of the motor after a predetermined time has elapsed from a start of the control of the output torque of the motor.

8. The damping control device according to claim 1 , wherein
a shift control unit that sets a target transmission ratio of the transmission is provided; and
the shift vibration suppression unit stopping the control of the output torque of the motor when a deviation between a transmission ratio that is detected by the transmission ratio detection unit and the target transmission ratio is less than a predetermined value.

9. The damping control device according to claim 8 , wherein
the shift vibration suppression unit stops the control of the output torque of the motor when a change rate of the target transmission ratio is less than a predetermined value.

10. The damping control device according to claim 8 , wherein
the shift vibration suppression unit stops the control of the output torque of the motor when a deviation between the target transmission ratio and a reaching transmission ratio by a shift control of the shift control unit is less than a predetermined value.

Assignees

• Nissan Motor

Inventors

• Orita Shuichi

Classifications

• B60W2050/0012

  Feedforward or open loop systems · CPC title

• B60W2510/107

  Temperature · CPC title

• B60W2510/1005

  Transmission ratio engaged · CPC title

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• B60L15/2054

  by controlling transmissions or clutches · CPC title