Actuation of a converter lock-up clutch of a hydrodynamic torque converter by means of a safety function
AssigneeZF Friedrichshafen AG
InventorsChristoph Hess, Jörg Arnold, Jens Weller
Life of this patent
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Abstract
The invention relates to the actuation of a converter lock-up clutch (44) of a hydrodynamic torque converter (4) in a vehicle drive-train by means of a safety function where, in addition to a driving strategy function, the safety function can actuate the converter lock-up clutch (44) by issuing a clutch actuation command. For this purpose, at least one rotation speed at the torque converter (4) is monitored. If the monitored rotation speed is below a rotation speed threshold, the safety function commands an actuation of the converter lock-up clutch (44) in its opening direction.
Claims16
A method for actuating a converter lock-up clutch of a hydrodynamic torque converter in a vehicle drive-train by means of a safety function, the method comprising:
- providing the vehicle drive-train with the hydrodynamic torque converter having the safety function configured to actuate the converter lock-up clutch and to actuate a driving strategy function by issuing a clutch actuation command;
- monitoring, by the safety function, at least one rotation speed at the hydrodynamic torque converter to determine a monitored rotation speed;
- determining that the monitored rotation speed falls below a rotation speed threshold;
- and
- issuing, by the safety function, the clutch actuation command, to open the converter lock-up clutch.
Dependencies are inferred from the claim text.