System and method for controlling impact reduction of electric vehicle

Patent metadata

Field	Value
Publication number	US-9610859-B1
Application number	US-201514938959-A
Country	US
Kind code	B1
Filing date	Nov 12, 2015
Priority date	Sep 10, 2015
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A system and method for controlling impact reduction of an electric vehicle can reduce the impact generated while releasing a P stage of a shift lever on a sloped road. The method and system utilize a motor as a power source, and the method includes: determining whether a torque applying condition is satisfied when a release of the P stage of the shift lever is required on a sloped road; calculating a torque for impact reduction when the torque applying condition is satisfied; applying the torque for impact reduction and controlling anti-jerk to change; stopping applying the torque for impact reduction when a vehicle speed is greater than or equal to a predetermined speed; and controlling anti-jerk to restore when the release of the P stage of the shift lever is completed.

First claim

What is claimed is:

1. A method for controlling impact reduction of an electric vehicle including a motor as a power source, comprising:
determining whether a torque applying condition is satisfied when a release of a P stage of a shift lever is required on a sloped road;
calculating a torque for impact reduction when the torque applying condition is satisfied;
applying the torque for impact reduction and controlling anti-jerk to change;
stopping applying the torque for impact reduction when a vehicle speed is greater than or equal to a predetermined speed; and
controlling anti-jerk to restore when the release of the P stage of the shift lever is completed.

2. The method of claim 1 , wherein the torque for impact reduction is calculated based on a vehicle weight, a wheel radius, a shift ratio, and an amount of braking requirement.

3. The method of claim 1 , wherein the torque applying condition is satisfied when an acceleration sensor is not in a malfunction state, the vehicle speed is less than the predetermined speed, and the amount of braking requirement is greater than or equal to a predetermined value.

4. The method of claim 1 , wherein the change control of anti-jerk adjusts an anti-jerk gain and a coefficient of a vibration component extraction filter according to a degree of road slope.

5. The method of claim 1 , further comprising:
when the torque applying condition is not satisfied,
controlling anti-jerk to change; and
controlling anti-jerk to restore when the release of the P stage of the shift lever is completed.

6. A system for controlling impact reduction of an electric vehicle including a motor as a power source, comprising:
a driving information detector configured to detect a vehicle speed, a degree of road slope, a position value of a brake pedal, and a shift lever of the electric vehicle; and
a controller configured to control a motor torque based on a signal from the driving information detector,
wherein the controller determines whether a torque applying condition is satisfied when a release of a P stage of the shift lever is required on a sloped road, calculates a torque for impact reduction when the torque applying condition is satisfied, applies the torque for impact reduction, controls anti-jerk to change, stops applying the torque for impact reduction when a vehicle speed is greater than or equal to a predetermined speed, and controls anti-jerk to restore when the release of the P stage of the shift lever is completed.

7. The system of claim 6 , wherein the controller calculates the torque for impact reduction based on a vehicle weight, a wheel radius, a shift ratio, and an amount of braking requirement.

8. The system of claim 6 , wherein the controller determines that the torque applying condition is satisfied when an acceleration sensor is not in a malfunction state, the vehicle speed is less than the predetermined speed, and the amount of braking requirement is greater than or equal to a predetermined value.

9. The system of claim 6 , wherein the controller controls anti-jerk to change by adjusting an anti-jerk gain and a coefficient of a vibration component extraction filter according to the degree of road slope.

10. The system of claim 6 , wherein the controller controls anti-jerk to change when the torque applying condition is not satisfied and controls anti-jerk to restore when the release of the P stage of the shift lever is completed.

11. A non-transitory computer readable medium containing program instructions executed by a processor, the computer readable medium comprising:
program instructions that determine whether a torque applying condition is satisfied when a release of a P stage of a shift lever is required on a sloped road;
program instructions that calculate a torque for impact reduction when the torque applying condition is satisfied;
program instructions that apply the torque for impact reduction and controlling anti-jerk to change;
program instructions that stop applying the torque for impact reduction when a vehicle speed is greater than or equal to a predetermined speed; and
program instructions that control anti-jerk to restore when the release of the P stage of the shift lever is completed.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Cho Woocheol

Classifications

• B60L15/20 Primary

  for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed · CPC title

• B60W30/20

  Reducing vibrations in the driveline · CPC title

• B60L2250/24

  by lever actuation · CPC title

• B60W2552/15

  Road slope, i.e. the inclination of a road segment in the longitudinal direction · CPC title

• B60L2240/423

  Torque · CPC title