US 11,718,301 B2
Method for operating a motor vehicle comprising a power take-off unit
Ulf Lang, Friedrichshafen (DE)
Assigned to ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed by ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed on Dec. 9, 2021, as Appl. No. 17/546,591.
Claims priority of application No. 10 2020 215 661.1 (DE), filed on Dec. 10, 2020.
Prior Publication US 2022/0185286 A1, Jun. 16, 2022
Int. Cl. B60W 10/11 (2012.01); B60W 30/188 (2012.01); B60W 10/02 (2006.01); B60W 10/04 (2006.01)
CPC B60W 30/1888 (2013.01) [B60W 10/02 (2013.01); B60W 10/04 (2013.01); B60W 10/11 (2013.01); B60W 2300/15 (2013.01); B60W 2710/021 (2013.01); B60W 2710/0644 (2013.01); B60W 2710/0677 (2013.01); B60W 2710/081 (2013.01); B60W 2710/086 (2013.01); B60W 2710/1005 (2013.01); B60W 2710/1011 (2013.01); B60W 2710/1022 (2013.01); B60W 2710/1083 (2013.01)] 12 Claims
OG exemplary drawing
 
1. 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.