Electric vehicle

Patent metadata

Field	Value
Publication number	US-11052768-B2
Application number	US-201916675100-A
Country	US
Kind code	B2
Filing date	Nov 5, 2019
Priority date	Nov 6, 2018
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

In an electric vehicle including a motor for traveling, when an accelerator is switched from an on-state to an off-state, the motor is controlled such that a vehicle torque is varied more gradually toward a requested torque on a brake side (requested torque in the off-state) in turning than in traveling straight. Thereby, when the accelerator is switched from the on-state to the off-state in turning, drivability of the driver can be restrained from deteriorating.

First claim

What is claimed is:

1. An electric vehicle comprising:
a motor for traveling; and
a control apparatus that controls the motor such that a vehicle torque is varied more gradually toward a requested torque on a brake side in turning than in traveling straight, when an accelerator is switched from an on-state to an off-state.

2. The electric vehicle according to claim 1 , wherein:
the control apparatus sets a transient torque by performing rate processing using a rate value on the requested torque when the accelerator is switched from the on-state to the off-state, and controls the motor such that the transient torque acts on the vehicle; and
the control apparatus sets the rate value to be smaller in turning than in traveling straight, when the accelerator is switched from the on-state to the off-state.

3. The electric vehicle according to claim 2 , wherein the control apparatus sets the rate value to be smaller when an absolute value of a steering angle or an acceleration in a transverse direction of the vehicle is large than when the absolute value of the steering angle or the acceleration in the transverse direction of the vehicle is small, when the accelerator is switched from the on-state to the off-state in turning.

4. The electric vehicle according to claim 2 , wherein the control apparatus sets the rate value to be smaller when the requested torque on a brake side is large than when the requested torque on a brake side is small or to be smaller when a requested deceleration of the vehicle based on the requested torque is large than when the requested deceleration of the vehicle based on the requested torque is small, when the accelerator is switched from the on-state to the off-state.

5. The electric vehicle according to claim 1 , wherein a vehicle torque rate when the vehicle is turning varies in a substantially linear fashion.

6. The electric vehicle according to claim 1 , wherein a vehicle torque rate when the vehicle is traveling straight varies in a substantially linear fashion.

7. The electric vehicle according to claim 1 , wherein the control apparatus is connected to an accelerator pedal.

8. An electric vehicle comprising:
a motor for traveling;
a control apparatus configured to control the motor such that a vehicle torque is varied more gradually toward a requested torque on a brake side in turning than in traveling straight, when an accelerator is switched from an on-state to an off-state, wherein:
the control apparatus is configured to set a transient torque by performing rate processing using a rate value on the requested torque when the accelerator is switched from the on-state to the off-state, and controls the motor such that the transient torque acts on the vehicle; and
the control apparatus is configured to set the rate value to be smaller in turning than in traveling straight, when the accelerator is switched from the on-state to the off-state.

9. The electric vehicle according to claim 8 , wherein the control apparatus is configured to set the rate value to be smaller when an absolute value of a steering angle or an acceleration in a transverse direction of the vehicle is large than when the absolute value of the steering angle or the acceleration in the transverse direction of the vehicle is small, when the accelerator is switched from the on-state to the off-state in turning.

10. The electric vehicle according to claim 8 , wherein the control apparatus is configured to set the rate value to be smaller when the requested torque on a brake side is large than when the requested torque on a brake side is small.

11. The electric vehicle according to claim 8 , wherein the control apparatus is configured to set the rate value to be smaller when a requested deceleration of the vehicle based on the requested torque is large than when the requested deceleration of the vehicle based on the requested torque is small, when the accelerator is switched from the on-state to the off-state.

12. The electric vehicle according to claim 8 , wherein a vehicle torque rate when the vehicle is turning varies in a substantially linear fashion.

13. The electric vehicle according to claim 8 , wherein a vehicle torque rate when the vehicle is traveling straight varies in a substantially linear fashion.

14. The electric vehicle according to claim 8 , wherein the control apparatus is connected to an accelerator pedal.

15. An hybrid vehicle comprising:
a motor for traveling;
a control apparatus configured to control the motor such that a vehicle torque is varied more gradually toward a requested torque on a brake side in turning than in traveling straight, when an accelerator is switched from an on-state to an off-state, wherein:
the control apparatus is configured to set a transient torque by performing rate processing using a rate value on the requested torque when the accelerator is switched from the on-state to the off-state, and controls the motor such that the transient torque acts on the vehicle; and
the control apparatus is configured to set the rate value to be smaller in turning than in traveling straight, when the accelerator is switched from the on-state to the off-state.

16. The hybrid vehicle according to claim 15 , wherein the control apparatus is configured to set the rate value to be smaller when an absolute value of a steering angle or an acceleration in a transverse direction of the vehicle is large than when the absolute value of the steering angle or the acceleration in the transverse direction of the vehicle is small, when the accelerator is switched from the on-state to the off-state in turning.

17. The hybrid vehicle according to claim 15 , wherein the control apparatus is configured to set the rate value to be smaller when the requested torque on a brake side is large than when the requested torque on a brake side is small.

18. The hybrid vehicle according to claim 15 , wherein the control apparatus is configured to set the rate value to be smaller when a requested deceleration of the vehicle based on the requested torque is large than when the requested deceleration of the vehicle based on the requested torque is small, when the accelerator is switched from the on-state to the off-state.

19. The hybrid vehicle according to claim 15 , wherein a vehicle torque rate when the vehicle is turning varies in a substantially linear fashion.

20. The hybrid vehicle according to claim 15 , wherein a vehicle torque rate when the vehicle is traveling straight varies in a substantially linear fashion.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kaneko Tatsuya

Classifications

• Y02T10/72

  Electric energy management in electromobility · CPC title

• B60L2240/18

  lateral · CPC title

• B60K6/22

  characterised by apparatus, components or means specially adapted for HEVs · CPC title

• H02P23/183

  of one shaft without controlling the prime mover · CPC title

• B60W2510/083

  Torque · CPC title