Electrohydraulic transmission clutch of a motor vehicle

Patent metadata

Field	Value
Publication number	US-11326657-B2
Application number	US-201615774326-A
Country	US
Kind code	B2
Filing date	Oct 27, 2016
Priority date	Nov 9, 2015
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A method for operating an electrohydraulic transmission clutch of a motor vehicle, wherein, for a clutch operation, a hydraulic pressure is set by way of a regulating device of a controller as a function of a clutch signal, and, through the pressure, a disengagement element of the transmission clutch is moved through a soft region into a rigid region via a rigid point, or vice versa. The soft region is to be compensated for. Further, as a function of the clutch signal, the regulating device generates a preliminary target value signal for the pressure and a time derivative of the preliminary target value signal is generated as a movement signal, and a pilot control generates a pilot control signal as a function of the movement signal, and the preliminary target value signal and the pilot control signal are combined to give a final actuating value signal for the pressure.

First claim

The invention claimed is:

1. A method for operating an electrohydraulic transmission clutch of a motor vehicle, comprising:
setting a hydraulic pressure for a clutch operation by way of a regulating device of a controller as a function of a clutch signal and
moving a disengagement element of the transmission clutch through a soft region into a rigid region after a rigid point, or vice versa,
wherein, as a function of the clutch signal, the regulating device generates a preliminary target value signal for the pressure, a time derivative of the preliminary target value signal is generated as a movement signal, a pilot control generates a pilot control signal as a function of the movement signal, and the preliminary target value signal and the pilot control signal are combined to give a final actuating value signal for the pressure as a control signal at a signal output to compensate for a pressure difference between the soft region and the rigid region, wherein in the rigid region a ratio of clutch movement to movement of a disengagement element is greater than the ratio of clutch movement to movement of the disengagement element with respect to linear displacement or pressure in the soft region, and wherein the pilot control is active only in the soft region.

2. The method according to claim 1 , wherein, by way of the pilot control, the movement signal is scaled with a pilot control factor and the pilot control factor is set as a function of at least one operating variable of the motor vehicle.

3. The method according to claim 2 , wherein, as the at least one operating variable, at least one temperature is recorded.

4. The method according to claim 2 , wherein the pilot control factor is determined as a function of the at least one operating variable by means of an assignment device, and the assignment device is adapted in the operation of the motor vehicle, as a function of a time constant with which a time signal of the pressure follows the preliminary target value signal or the final actuating value signal.

5. The method according to claim 2 , wherein the pilot control factor is set as a function of a difference between the actual pressure and a pressure that is obtained in the rigid point.

6. The method according to claim 1 , further comprising:
adjusting, by the controller, an actuating output for setting the hydraulic pressure for moving the disengagement element of the transmission clutch.

7. The method according to claim 6 , wherein the controller is coupled to an electric actuator for setting the hydraulic pressure for moving a disengagement element of the transmission clutch.

Assignees

• Audi Ag

Inventors

• Jonuscheit Michael

Classifications

• F16D2500/70235

  Displacement · CPC title

• F16D2500/3142

  Clutch pedal position rate · CPC title

• F16D2500/3024

  Pressure · CPC title

• F16D2500/3166

  Detection of an elapsed period of time · CPC title

• F16D2500/7041

  Position · CPC title