Patent ID: 8088040

Claim:
A process for actuating a transmission mechanism ( 3 ) having several shifting elements (A to E), which are actuated by hydraulic fluid from a pressure source ( 4 ) for one of engaging and disengaging different transmission steps, and several electric actuators ( 7 , 8 ) of a hydraulic system of the transmission mechanism ( 3 ) adjust actuating pressures of the hydraulic fluid for the shifting elements (A to E), the process comprising the steps of: adjusting a flow of electrical charge to the electric actuators ( 7 , 8 ) from an initial operating level that is not zero to a standby level when a request is made, by an engine start/stop function, to shut down an internal combustion engine ( 2 ) of a drive train comprising the transmission mechanism, the flow of electrical charge at the initial operating level energizes the electric actuators ( 7 , 8 ) with a current value that equates to an actuating pressure at which the shifting elements (A to E) are actuated in an initial operating state; adjusting the flow of electrical charge to the electric actuators ( 7 , 8 ) from the standby level to a subsequent operating level, when a request is made, by the engine start/stop function, to startup the internal combustion engine ( 2 ); adjusting the flow of electrical charge to the electric actuators ( 7 , 8 ) during normal driving operation of the vehicle ( 1 ) such that, on an actuator side, the transmission mechanism ( 3 ) is shifted, via a shift process, from a startup gear transmission ratio to a target gear transmission ratio, when a request is made to shutdown the internal combustion engine ( 2 ); providing a system pressure in the hydraulic system being zero when the internal combustion engine ( 2 ) is shutdown; providing the flow of electrical charge in the transmission mechanism to the electric actuators ( 7 , 8 ) being lower at the standby level than at the initial operating level; and providing the standby level of the current feed to the electric actuators ( 7 , 8 ), upon a request for the internal combustion engine ( 2 ) to shutdown, corresponds to the subsequent operating level provided for implementation of a subsequent transmission step.