METHOD FOR ACTIVATING A CLUTCH ARRANGEMENT

• US 20100004092A1
• Filed: 07/01/2009
• Published: 01/07/2010
• Est. Priority Date: 07/01/2008
• Status: Active Grant

• Current Assignee: Getrag Getriebe- und Zahnradfabrik Hermann Hagenmeyer GmbH & CIE KG
• Original Assignee: Getrag Getriebe- und Zahnradfabrik Hermann Hagenmeyer GmbH & CIE KG
• Inventors: Glatthaar, Josef, Thum, Stefan
• Granted Patent: US 8,340,879 B2
• Time in Patent Office: Days
• US Class Current: 477/109
• CPC Class Codes: F16D 2500/1026 Hydraulic
• CPC Class Codes: F16D 2500/1086 Concentric shafts
• CPC Class Codes: F16D 2500/3024 Pressure
• CPC Class Codes: F16D 2500/3121 Ambient conditions, e.g. air humidity, air temperature, ambient pressure
• CPC Class Codes: F16D 2500/50236 Adaptations of the clutch characteristics, e.g. curve clutch capacity torque - clutch actuator displacement
• CPC Class Codes: F16D 2500/50293 Reduction of vibrations
• CPC Class Codes: F16D 2500/50653 Gearing shifting without the interruption of drive
• CPC Class Codes: F16D 2500/50684 Torque resume after shifting
• CPC Class Codes: F16D 2500/70406 Pressure
• CPC Class Codes: F16D 48/066 Control of fluid pressure, e.g. using an accumulator F16D48/062, F16D48/068 take precedence

Abstract

A method for opening a closed clutch arrangement of a drivetrain for a motor vehicle. The clutch arrangement is activated in such a way that the torque which it can transmit is reduced up to an opening point at which torque can no longer be transmitted via the clutch arrangement. The clutch arrangement is placed into an intermediate slip state before the opening point is reached.

Claims

1. Method for opening a closed clutch arrangement of a drivetrain for a motor vehicle, wherein the clutch arrangement is activated in such a way that the torque which it can transmit is reduced up to an opening point at which torque can no longer be transmitted via the clutch arrangement, and wherein the clutch arrangement is placed into an intermediate slip state before the opening point is reached.

2. Method according to claim 1, wherein the torque which can be transmitted by the clutch arrangement is reduced linearly to reach the slip state.

3. Method according to claim 1, wherein the torque which can be transmitted by the clutch arrangement is reduced in a pulsed fashion to reach the slip state.

4. Method according to claim 1, wherein the pressure applied to the clutch arrangement is increased after the slip state is reached such that the slip state is ended again.

5. Method according to claim 4, wherein the clutch pressure is raised by a predefined value.

6. Method according to claim 4, wherein the pressure applied to the clutch arrangement at which the slip state is ended, and the transmissible torque, are measured and stored as a value pair.

7. Method according to claim 6, wherein the stored value pair is used for controlling the clutch arrangement during subsequent opening processes.

8. Method according to claim 6, wherein the stored value pair is used for controlling a second clutch arrangement.

9. Method according to claim 1, wherein the clutch arrangement has a wet-running clutch.

10. Method according to claim 1, wherein the clutch arrangement is actuated by means of a hydraulic actuator.

11. Method according to claim 9, wherein, in an open state in which no torque can be transmitted by the clutch arrangement, a hydraulic internal pressure of the clutch arrangement is measured and is used as a reference pressure for the pressure applied to the clutch arrangement.

12. Method according to claim 11, wherein the reference pressure is adapted in the closed state of the clutch arrangement corresponding to a varying outside pressure.

13. Method for opening a closed clutch arrangement of a drivetrain for a motor vehicle, wherein the clutch arrangement is activated in such a way that the torque which it can transmit is reduced up to an opening point at which torque can no longer be transmitted via the clutch arrangement, and wherein the clutch arrangement is placed into an intermediate slip state before the opening point is reached,

wherein the pressure applied to the clutch arrangement is increased after the slip state is reached such that the slip state is ended again,

wherein the pressure applied to the clutch arrangement at which the slip state is ended, and the transmissible torque, are measured and stored as a value pair,

and wherein the stored value pair is used for controlling the clutch arrangement during subsequent opening processes.

14. Method according to claim 13, wherein the clutch pressure is raised by a predefined value.

15. Method according to claim 13, wherein the stored value pair is used for controlling a second clutch arrangement.

16. Method for opening a closed clutch arrangement of a drivetrain for a motor vehicle, wherein the clutch arrangement is activated in such a way that the torque which it can transmit is reduced up to an opening point at which torque can no longer be transmitted via the clutch arrangement,

wherein the clutch arrangement has a wet-running clutch, and

wherein, in an open state in which no torque can be transmitted by the clutch arrangement, a hydraulic internal pressure of the clutch arrangement is measured and is used as a reference pressure for the pressure applied to the clutch arrangement.

17. Method according to claim 16, wherein the reference pressure is adapted in the closed state of the clutch arrangement corresponding to a varying outside pressure.