Patent ID: 8180540

Claim:
A continuously variable transmission comprising at least one rotatable output shaft, at least one rotatable non-output shafts, and at least one continuously variable transmission elements selectively interconnecting the at least one non-output shaft and the at least one output shaft so as to permit variation of a transmission ratio therebetween, one or more control elements for controlling the instantaneously prevailing ratio of the transmission; one or more sensor devices for sensing the rotational position of at least one sensed, non-output shaft, and a processing device for determining the rotational position of said at least one sensed non-output shaft at a chosen instant, the processing device being operatively connected to one or more said control elements to cause variation of the transmission ratio so that said output shaft attains a desired rotational position at a chosen instant; wherein the at least one rotatable non-output shafts includes two non-output shafts, and the one or more sensor devices includes two sensor devices for respectively sensing the rotational positions of the two non-output shafts, and wherein the outputs of said sensor devices are fed to the processing device that calculates said desired rotational position of said output shaft based on the difference between the sensed rotational positions.