Method for setting a clutch torque

• US 9,914,457 B2
• Filed: 05/13/2015
• Issued: 03/13/2018
• Est. Priority Date: 05/16/2014
• Status: Active Grant

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Inventors: Beller, Dimitri, Sieland, Bjoern
• Primary Examiner(s): LE, HUAN G
• Application Number:
  US14/710,607
• Publication Number:
  US 20150329118A1
• Time in Patent Office: 1,035 Days
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/182 Brake pressure, e.g. of fluid or between pad and disc
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2710/027 Clutch torque
• CPC Class Codes: B60W 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: F16D 2500/10412 Transmission line of a vehicle
• CPC Class Codes: F16D 2500/3065 Torque of the engine
• CPC Class Codes: F16D 2500/3067 Speed of the engine
• CPC Class Codes: F16D 2500/3101 Detection of a brake actuation by a sensor on the brake
• CPC Class Codes: F16D 2500/50224 Drive-off
• CPC Class Codes: F16D 2500/50287 Torque control
• CPC Class Codes: F16D 2500/7027 Engine speed
• CPC Class Codes: F16D 2500/7044 Output shaft torque
• CPC Class Codes: F16D 2500/70605 Adaptive correction; Modifying control system parameters, e.g. gains, constants, look-up tables
• CPC Class Codes: F16D 48/06 Control by electric or electronic means, e.g. of fluid pressure
• CPC Class Codes: F16D 48/08 Regulating clutch take-up on starting

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.

Claims

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.