Method for heating a gearbox for a working machine
AssigneeZF Friedrichshafen AG
InventorsTobias Dieterich, Sven Bieber, Anton Arnold
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Abstract
The present invention relates to a method for heating a transmission (1) for a working machine having a plurality of hydraulically actuated shifting elements (8; 9; 10; 11; 12; 13). The method involves the sending (III) of a closing signal for closing shifting elements (8; 9; 10; 11; 12; 13) in order to block the transmission (1). In addition, the method entails pulsed actuation (V) for opening and closing of at least one of the closed shifting elements (8; 9; 10; 11; 12; 13) while the transmission (1) remains blocked. Furthermore, the present invention relates to a control unit which is designed to carry out such a method, and to a transmission for a working machine with such a control unit.
Claims9
A method for heating a transmission for a working machine having a plurality of hydraulically actuated shifting elements, the method comprising:
- sending a closing signal for closing shifting elements of the transmission in order to block the transmission;
- and
- pulsed actuation to open and close at least one of the closed shifting elements while the transmission remains blocked;
- wherein the pulsed actuation consists in actuating, with a number of pulsed cycles for opening and closing, at least one of the plurality of hydraulically actuated shifting elements, wherein a pulse duration of the actuation decreases as a number of cycles increases.
Dependencies are inferred from the claim text.