Patent ID: 6939264

Claim:
A method for closed loop controlling a stepless transmission (G) having a transmission ratio that is continuously variable between two transmission ratio end values, said method comprising the following steps: a) generating at least one transmission ratio shifting actuator force that is effective on position shiftable transmission members (P 2 , S 2 ) for shifting said transmission members and thus on the transmission ratio between two transmission end positions corresponding to two transmission ratio end values, b) defining an end position operating mode as an operating mode by performing the further steps of c) generating a power oscillation, d) first modulating said at least one actuator force with said power oscillation to vary a mean proportion of said at least one actuator force to provide a closed loop control signal, e) second modulating said transmission ratio in response to said first modulating so that said transmission ratio oscillates about a transmission ratio mean value, f) ascertaining a measured value (a M ) which depends on said second modulating of said transmission ratio (i) and represents a mean spacing between each of said position shiftable transmission members (S 2 , P 2 ) and the respective end position, and g) controlling said measured value (a M ) in response to said closed loop control signal so that said measured value (a M ) corresponds to a predetermined rated value (a S ), whereby said at least one actuator force is limited when said position shiftable transmission members (P, S) move into a respective end position.