Method for setting a clutch torque

Patent metadata

Field	Value
Publication number	US-9914457-B2
Application number	US-201514710607-A
Country	US
Kind code	B2
Filing date	May 13, 2015
Priority date	May 16, 2014
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

A method for setting a clutch torque between an engine and a drive of a vehicle during a starting process of the vehicle includes increasing the clutch torque during a first phase, limiting the clutch torque to a first torque value during the first phase, and further increasing the clutch torque in a second phase after an engine rotational speed reaches a rotational speed limit.

First claim

What is claimed is:

1. A method for setting a clutch torque between an engine and a drive of a vehicle during a starting process of the vehicle, the method comprising:
increasing the clutch torque during a first phase,
limiting the clutch torque to a first torque value during the first phase, and
further increasing the clutch torque in a second phase after an engine rotational speed increases above a rotational speed limit,
wherein in the second phase the clutch torque is increased in accordance with a first time behavior,
wherein, after a predefined torque limit is reached, the clutch torque is increased in accordance with a second time behavior in a third phase,
wherein, the first time behavior constitutes a faster increase in the clutch torque over time than the second time behavior.

2. The method as recited in claim 1 , wherein during the second phase the clutch torque is increased linearly over time.

3. The method as recited in claim 1 , wherein during the third phase the clutch torque is increased as a function of a driver's request.

4. The method as recited in claim 3 , wherein during the third phase the clutch torque is calculated from a multiplication of the driver's request by a predefined function.

5. The method as recited in claim 4 , wherein the predefined function is a predefined function of engine rotational speed.

6. The method as recited in claim 5 , wherein the predefined function is a characteristic curve that varies with engine rotational speed.

7. The method as recited in claim 1 , wherein the first phase is started as a function of a brake pressure of the vehicle.

8. The method as recited in claim 7 , wherein the first phase is started when the brake pressure approaches a predefined value.

9. The method as recited in claim 8 , wherein the first phase is started when the brake pressure undershoots a predefined value.

10. The method as recited in claim 1 , wherein the clutch torque is limited during the first phase to a torque of 5% of a maximum torque of the engine.

11. The method as recited in claim 1 , wherein the rotational speed limit is based on an idling rotational speed of the engine.

12. The method as recited in claim 11 , wherein the rotational speed limit is calculated from a sum of the idling rotational speed and a constant rotational speed value.

13. The method as recited in claim 1 , wherein the first torque value is obtained as a function of a driver's request.

14. The method as recited in claim 13 , wherein the first torque value is calculated with a multiplication of the driver's request by a constant.

15. The method as recited in claim 13 , wherein the method is carried out if the driver's request indicates an acceleration above a predefined threshold value.

16. The method as recited in claim 15 , wherein the method is carried out if activation of a gas pedal for inputting the driver's request exceeds a predefined speed.

17. A control unit configured to carry out a method for setting a clutch torque between an engine and a drive of a vehicle during a starting process of the vehicle, the control unit being configured to:
increase the clutch torque during a first phase,
limit the clutch torque to a first torque value during the first phase, and
further increase the clutch torque in a second phase after an engine rotational speed increases above a rotational speed limit,
wherein in the second phase the clutch torque is increased in accordance with a first time behavior,
wherein, after a predefined torque limit is reached, the clutch torque is increased in accordance with a second time behavior in a third phase,
wherein, the first time behavior constitutes a faster increase in the clutch torque over time than the second time behavior.

18. A method for setting a clutch torque between an engine and a drive of a vehicle during a starting process of the vehicle, the method comprising:
increasing the clutch torque during a first phase,
limiting the clutch torque to a first torque value during the first phase, and
further increasing the clutch torque in a second phase after an engine rotational speed increases above a rotational speed limit,
wherein the first phase is started as a function of a brake pressure of the vehicle.

Assignees

• Porsche Ag

Inventors

• Beller Dimitri
• Sieland Bjoern

Classifications

• B60W2710/027

  Clutch torque · CPC title

• F16D2500/50224

  Drive-off · CPC title

• Y10T477/753

  Cross-Sectional Technologies · mapped topic

• B60W2540/10

  Accelerator pedal position · CPC title

• B60W10/06

  including control of combustion engines · CPC title