Method for controlling an actuator of a starting clutch in the automatic transmission of a vehicle
AssigneeZF Friedrichshafen AG
InventorWilhelm Härdtle
Life of this patent
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Abstract
A method for the control of an actuator of a starting clutch of a motor vehicle. The actuator is so regulated by a control apparatus that the starting clutch is closed upon the presence of a desire for starting, as well as closed by an adjusted, transmission ratio, and the clutch is opened upon the termination of the starting procedure. For the freeing of a vehicle from a roadway obstruction by way of a rocking process of the vehicle, it is proposed that the starting clutch, during a starting procedure and by way of control of the actuation actuator, is operated in a fully automatic manner in such a way, that the torque (M_K) periodically varies.
Claims19
A method for controlling an actuator of a starting clutch of an automatic transmission of a motor vehicle independently of a vehicle operator to cause a back-and-forth rocking motion of the vehicle to free the vehicle from a roadway obstruction, the method comprising the steps of:
- sensing
- a driving speed of the vehicle below a predetermined limit,
- at least one of
- a slippage of at least one vehicle wheel exceeding a predetermined slippage threshold, and
- a drive moment of a force acting against a vehicle wheel exceeding a predetermined drive moment threshold, and
- a positioning of an operator controlled gas pedal exceeding a kick-down deflection angle, and
- periodically activating the actuator to engage and disengage the starting clutch at an activation frequency (F1) selected to cause the back-and-forth rocking motion.
A method for controlling an actuator of a starting clutch of an automatic transmission of a motor vehicle, the method comprising the steps of:
- providing a control unit for controlling the actuator in the following manner:
- engaging the starting clutch when a starting operation request is received at a predetermined transmission ratio;
- disengaging the starting clutch to end the starting operation;
- controlling the actuator during the starting operation so as to periodically fluctuate a transmitted torque (M__K);
- and
- tuning the periodic fluctuation of the transmitted clutch actuator to characteristics of the motor vehicle and an obstacle in a drive path of the motor vehicle:
- and
- automatically overcoming the obstacle in the drive path while maintaining the predetermined transmission ratio unchanged during the periodic fluctuation operation of the actuator or the starting clutch.
Dependencies are inferred from the claim text.