Clutch control method for vehicle

Patent metadata

Field	Value
Publication number	US-11221049-B2
Application number	US-202017019758-A
Country	US
Kind code	B2
Filing date	Sep 14, 2020
Priority date	Apr 21, 2020
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A clutch control method for a vehicle includes: increasing, by a controller, a clutch torque to a refill execution torque at a predetermined first inclination when a predetermined first reference time period has elapsed in a micro-slip state of a clutch; increasing, by the controller, the clutch torque to a refill torque at a predetermined second inclination to initiate refilling of a pressure chamber of a hydraulic-driving actuator with oil in a reservoir tank when the clutch torque reaches the refill execution torque; and maintaining the clutch torque at the refill torque during a predetermined second reference time period.

First claim

What is claimed is:

1. A clutch control method for a vehicle, the method comprising:
increasing, by a controller, a clutch torque to a refill execution torque at a predetermined first inclination when a predetermined first reference time period has elapsed in a micro-slip state of a clutch;
increasing, by the controller, the clutch torque to a refill torque at a predetermined second inclination to initiate refilling of a pressure chamber of a hydraulic-driving actuator with oil in a reservoir tank when the clutch torque reaches the refill execution torque; and
maintaining, by the controller, the clutch torque at the refill torque during a predetermined second reference time period.

2. The method according to claim 1 , further comprising:
learning, by the controller, clutch characteristics during the predetermined first reference time period during which the micro-slip state is maintained.

3. The method according to claim 2 , further comprising:
reducing, by the controller, the clutch torque so that the clutch forms the micro-slip state after the clutch torque is maintained at the refill torque during the predetermined second reference time period; and
confirming, by the controller, the clutch characteristics learned during the predetermined first reference time period while maintaining the micro-slip state after reducing the clutch torque.

4. The method according to claim 3 , further comprising:
increasing, by the controller, the clutch torque again to the refill execution torque at the predetermined first inclination after confirming the learned clutch characteristics; and
increasing, by the controller, the clutch torque to the refill torque at the predetermined second inclination.

5. The method according to claim 1 , wherein the predetermined first inclination is set to be less than the predetermined second inclination, and
wherein the predetermined second inclination is set to a maximum possible value.

6. The method according to claim 1 , wherein the refill execution torque is a clutch torque value corresponding to a position of a piston located just before the pressure chamber communicates with the reservoir tank, where the piston is provided to generate pressure in the pressure chamber of the hydraulic-driving actuator.

7. The method according to claim 6 , wherein the refill torque is a clutch torque value corresponding to a position of the piston at which the piston fully opens a passage provided to communicate with the reservoir tank.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Cho Sung Hyun

Classifications

• F16H2061/062

  for controlling filling of clutches or brake servos, e.g. fill time, fill level or pressure during filling · CPC title

• F16H61/061 Primary

  using electric control means · CPC title

• F16H61/0213

  characterised by the method for generating shift signals · CPC title

• F16H2061/0087

  Adaptive control, e.g. the control parameters adapted by learning · CPC title

• F16H59/72

  dependent on oil characteristics, e.g. temperature, viscosity · CPC title