Method for adjusting a friction coefficient of an automated clutch

Patent metadata

Field	Value
Publication number	US-10260573-B2
Application number	US-201515520620-A
Country	US
Kind code	B2
Filing date	Oct 20, 2015
Priority date	Nov 18, 2014
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

The invention relates to a method for adjusting a friction coefficient of an automated clutch, wherein a current friction coefficient (RK) is determined by a comparison with a moment of the internal combustion engine during a slipping phase of the clutch. In a method, in which the adaptation over the entire operation of the motor vehicle is possible, the current friction coefficient (RK) is pilot-controlled to a long-term friction coefficient (RL) in a non-slipping phase of the clutch and/or in the event of a torque signal that cannot be monitored.

First claim

The invention claimed is:

1. A method for adapting a friction value of an automated clutch, the method comprising:
(i) determining a current friction value (RK) by comparison with a torque of an internal combustion engine during a slipping phase of the clutch, and
(ii) pilot controlling the current friction value (RK) to a long-term friction value (RL) during at least one of the following phases:
(1) a non-slipping phase of the clutch, or
(2) a non-monitoring phase of a torque signal.

2. The method according to claim 1 , further comprising determining the long-term friction value (RL) as a function of temperature of the clutch.

3. The method according to claim 1 , wherein the long-term friction value (RL) is constant during a phase (III) of the pilot control.

4. The method according to claim 1 , further comprising determining a speed of an adjustment of the current friction value (RK) for the long-term friction value (RL) as a function of at least one of a relaxation rate or a cooling rate of the clutch.

5. The method according to claim 1 , further comprising determining a start value of the current friction value (RK) as a function of a temperature of the clutch at a beginning of step (ii).

6. The method according to claim 1 , further comprising determining a start value of the current friction value (RK) as a function of a cooling period of the clutch during step (ii).

7. A method for adapting a friction value of an automated clutch, the method comprising:
(i) pre-setting a long-term friction value that is constant;
(ii) determining a current friction value based on a comparative torque value during a slippage phase of the clutch, and
(iii) adapting the current friction value to the long-term friction value during a constant driving operation and at least one of the following phases:
(1) a non-slipping phase of the clutch, or
(2) a non-monitoring phase of a torque signal.

8. The method according to claim 7 , wherein step (iii) is carried out during the non-slipping phase of the clutch.

9. The method according to claim 7 , wherein step (iii) is carried out during the non-monitoring phase of the torque signal.

10. The method according to claim 7 , further comprising determining the long-term friction value as a function of temperature of the clutch.

11. The method according to claim 7 , further comprising determining a speed of an adjustment of the current friction value for the long-term friction value as a function of at least one of a relaxation rate or a cooling rate of the clutch.

12. The method according to claim 7 , further comprising determining a start value of the current friction value as a function of a temperature of the clutch at a beginning of step (iii).

13. The method according to claim 7 , further comprising determining a start value of the current friction value as a function of a cooling period of the clutch during step (iii).

Assignees

• Schaeffler Technologies Ag

Inventors

• Goppert Georg

Classifications

• F16D2500/50236

  Adaptations of the clutch characteristics, e.g. curve clutch capacity torque - clutch actuator displacement · CPC title

• F16D2500/3056

  Cooling oil temperature · CPC title

• F16D2500/30402

  Clutch friction coefficient · CPC title

• F16D2500/30404

  Clutch temperature · CPC title

• F16D2500/30406

  Clutch slip · CPC title