Method for controlling a friction clutch
AssigneeSchaeffler Technologies AG & Co. KG
InventorsEkkehard Reibold, Georg Goeppert, Loyal George MacMillian
Life of this patent
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Abstract
A method for controlling a friction clutch in a drive train of a motor vehicle, using a clutch actuator, on the basis of a clutch model. A nominal characteristic curve of the clutch moment, which is transmitted via the friction clutch, is adapted continuously to actual operating parameters. In order to counteract a loss of comfort of the motor vehicle, which is caused by the running-in behavior, for example, of the friction linings of the friction clutch, the friction clutch is operated by way of different sets of operating parameters during a running-in phase of the friction clutch, and after the run-in phase of the friction clutch.
Claims12
A method for controlling a friction clutch in a drivetrain of a motor vehicle by means of a clutch actuator, comprising:
- transitioning from a running-in phase of the friction clutch to a post-running-in phase for the friction clutch based on a threshold, wherein the threshold is selected from a group consisting of energy input to the friction clutch, driving behavior of a driver, a number of clutch processes, and a number and intensity of slip processes for the friction clutch;
- operating the friction clutch using:
- a first set of operating parameters during the running-in phase;
- and,
- a second set of operating parameters, different from the first set of operating parameters, during the post-running-in-phase of the friction clutch;
- specifying from a clutch model, a clutch torque to be transmitted and at least one set point value which produces the clutch torque;
- establishing a connection, with a nominal characteristic curve, between the set point value and the clutch torque;
- transmitting the clutch torque by the friction clutch;
- and,
- continuously adapting, using the clutch model, the nominal characteristic curve of the clutch torque;
- according to the first set of operating parameters during the running-in phase;
- and,
- according to the second set of operating parameters during the post-running-in phase.
A method for controlling a friction clutch in a drivetrain of a motor vehicle by means of a clutch actuator, comprising:
- operating the friction clutch using:
- a first set of operating parameters during a running-in phase in which friction linings for the friction clutch are in a new condition or have not yet adapted to each other;
- and,
- a second set of operating parameters, different from the first set of operating parameters, during a post-running-in phase of the friction clutch in which the friction linings for the friction clutch are not in the new condition or have adapted to each other;
- specifying from a clutch model, a clutch torque to be transmitted and at least one set point value which produces the clutch torque;
- establishing a connection, with a nominal characteristic curve, between the set point value and the clutch torque;
- transmitting the clutch torque by the friction clutch;
- and,
- continuously adapting, using the clutch model, the nominal characteristic curve of the clutch torque:
- according to the first set of operating parameters during the running-in phase;
- and,
- according to the second set of operating parameters during the post-running-in phase.
A method for controlling a friction clutch in a drivetrain of a motor vehicle by means of a clutch actuator, comprising:
- operating the friction clutch using:
- a first set of operating parameters during a running-in phase in which friction linings for the friction clutch are in a new condition or have not yet adapted to each other;
- and,
- a second set of operating parameters, different from the first set of operating parameters, during a post-running-in phase of the friction clutch in which the friction linings for the friction clutch are not in the new condition or have adapted to each other;
- specifying from a clutch model, a clutch torque to be transmitted and at least one set point value which produces the clutch torque;
- establishing a connection, with a nominal characteristic curve, between the set point value and the clutch torque;
- transmitting the clutch torque by the friction clutch;
- and,
- continuously adapting, using the clutch model, the nominal characteristic curve of the clutch torque:
- according to the first set of operating parameters during the running-in phase;
- and,
- according to the second set of operating parameters during the post-running-in phase, wherein the at least one set of point value includes:
- a first set point for the running-in phase;
- and,
- a second set point, different from the first set point, for the post-running-in phase.
Dependencies are inferred from the claim text.