Method for operating a motor vehicle comprising a power take-off unit
AssigneeZF Friedrichshafen AG
InventorUlf Lang
Life of this patent
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Abstract
A method of operating a motor vehicle. A request for coupling a power take-off is detected. It is checked (12) whether relevant boundary conditions for coupling the power take-off are fulfilled. If the boundary conditions are fulfilled, a system pressure for actuating the power take-off clutch is built up (16). It is checked (18) whether sufficient system pressure to actuate the power take-off clutch has been built up. When sufficient system pressure has sufficiently been built up, a confirmation signal is produced (20). In reaction to the confirmation signal, a driving transmission control unit is modified (34) in order to actuate the at least one shifting element of the driving transmission with a higher actuation pressure than with an unmodified driving transmission control unit.
Claims12
A method of operating a motor vehicle with a motor, a driving transmission having at least one shifting element, a power take-off and a power take-off clutch by which the power take-off is coupleable to the driving transmission, the method comprising at least the following steps:
- detecting a request to couple the power take-off;
- checking whether respective boundary conditions for coupling the power take-off are fulfilled;
- when the respective boundary conditions are fulfilled, building-up a system pressure sufficient for actuating the power take-off clutch;
- checking whether a system pressure sufficient for actuating the power take-off clutch has been built up;
- when sufficient system pressure has been built up, producing a confirmation signal that actuation of the power take-off clutch is permitted;
- and
- modifying a driving transmission control unit in reaction to the confirmation signal, in order to actuate the at least one shifting element of the driving transmission with a higher actuation pressure than with an unmodified driving transmission control unit.
Dependencies are inferred from the claim text.