METHOD FOR ACTUATING A CLUTCH AND CONTROL SYSTEM FOR A MANUAL CHANGE-SPEED TRANSMISSION

• US 20130173126A1
• Filed: 12/13/2012
• Published: 07/04/2013
• Est. Priority Date: 12/15/2011
• Status: Abandoned Application

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Ruebsam, Christian
• Application Number:
  US13/714,250
• Publication Number:
  US 20130173126A1
• Time in Patent Office: Days
• US Class Current: 701/67
• CPC Class Codes: B60K 23/02 for main transmission clutches
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/14 Clutch pedal position
• CPC Class Codes: B60W 30/1884 Avoiding stall or overspeed of the engine
• CPC Class Codes: B60Y 2300/56 Engine stall prevention

Abstract

A method for actuating a clutch for coupling a manual change-speed transmission of a motor vehicle, in which the clutch can be actuated with the help of a clutch pedal, is provided. The method includes sensing a rotational speed of a motor of the motor vehicle that can be coupled to the change-speed transmission via the clutch and/or sensing a travelling speed of the motor vehicle and actuating the clutch independently of a position of the clutch pedal when the sensed rotational speed undershoots a predefined limit rotational speed and/or the sensed travelling speed undershoots a predefined limit travelling speed.

Claims

1. A method for actuating a clutch for coupling a manual change-speed transmission of a motor vehicle, wherein the clutch can be actuated with the help of a clutch pedal, comprising:

sensing at least one of a rotational speed of a motor of the motor vehicle that is couplable to the change-speed transmission via the clutch and a travelling speed of the motor vehicle; and

actuating the clutch independently of a position of the clutch pedal, when at least one of the sensed rotational speed undershoots a predefined limit rotational speed and the sensed travelling speed undershoots a predefined limit travelling speed.

2. The method according to claim 1, wherein the predefined limit travelling speed is less than or equal to about 10 km/h.

3. The method according to claim 1, wherein the predefined limit travelling speed is less than or equal to about 3 km/h.

4. The method according to claim 2, wherein the clutch is actuated independently of the position of the clutch pedal in such a manner that for the motor vehicle a travelling speed v of about 0.5 km/h≦

v≦

about 7 km/h is obtained.

5. The method according to claim 2, wherein the clutch is actuated independently of the position of the clutch pedal in such a manner that for the motor vehicle a travelling speed v of about 3 km/h≦

v≦

about 4 km/h is obtained.

6. The method according to claim 1, wherein before reaching a stalling rotational speed of the motor the clutch is opened independently of a position of the clutch pedal.

7. The method according to claim 1, wherein the predefined limit rotational speed of the motor is selected as a function of an idle rotational speed of the motor.

8. The method according to claim 1, wherein the clutch is opened as soon as the sensed rotational speed of the motor in comparison with the predefined limit rotational speed of the motor percentage wise undershoots an amount of ≧

about 5% to ≦

about 20%.

9. The method according to claim 1, wherein reaching a critical resonance rotational speed of a two-mass flywheel associated with the drive train, the clutch is opened or closed independently of a position of the clutch pedal.

10. A control system for a manual change-speed transmission for a motor vehicle comprising:

a clutch in order to connect a combustion engine, with the change-speed transmission;

a clutch pedal for actuating the clutch; and

a control electronic device,

wherein at least one of a rotational speed of the motor and a travelling speed of the motor vehicle is sensed by the control electronic device and the clutch is actuated by the control electronic device upon at least one of an undershooting of the sensed rotational speed below a predefined limit rotational speed of the motor and an undershooting of the travelling speed below a limit travelling speed independently of a position of the clutch pedal.

11. The control system according to claim 10, wherein the clutch via the control electronic device is connected to the clutch pedal via at least one of a cable and a cableless connection, wherein upon an actuation of the clutch pedal control signals for actuating the clutch are transmitted to the control electronic device via the at least one cable and cableless connection and the clutch is actuated by the control electronic device.

12. The control system according to claim 10, wherein the clutch via the control electronic device is connected to the clutch pedal via a radio connection.

13. The control system according to claim 11, wherein the control electronic device further comprises at least one storage unit and at least one processor unit, wherein in the at least one storage unit, at least one of a measured rotational speed for a comparison with the predefined limit rotational speed of the motor and a stored travelling speed of the motor vehicle for a comparison with the predefined limit travelling speed is stored.

14. A motor vehicle, comprising:

a drive train including a manual change-speed transmission; and

a motor that can be coupled to the manual change-speed transmission via a clutch for driving the motor vehicle, wherein the clutch can be actuated by a control electric device that;

senses at least one of a rotational speed of a motor of the motor vehicle is couplable to the change-speed transmission via the clutch and a travelling speed of the motor vehicle; and

actuates the clutch independently of a position of the clutch pedal, when at least one of the sensed rotational speed undershoots a predefined limit rotational speed and the sensed travelling speed undershoots a predefined limit travelling speed.

15. A computer program product, comprising:

a storage unit readable by a processor unit and storing instructions for execution by the processor unit for performing a method comprising;

sensing at least one of a rotational speed of a motor of the motor vehicle is couplable to the change-speed transmission via the clutch and a travelling speed of the motor vehicle; and

actuating the clutch independently of a position of the clutch pedal, when at least one of the sensed rotational speed undershoots a predefined limit rotational speed and the sensed travelling speed undershoots a predefined limit travelling speed.