Patent ID: 7047118

Claim:
Apparatus for regulating the transmission ratio of a continuously variable transmission for motor vehicles, said apparatus comprising: a. sensors for detecting transmission operating parameters; b. an electronic control unit including a microprocessor and at least one memory in which operating parameters associated with reference transmission ratios are stored, wherein the electronic control unit further includes a preliminary control device in which a preliminary control value is determined as a function of at least one of the transmission operating parameters detected by the sensors, wherein the preliminary control value is stored in the preliminary control device as a function of at least two transmission operating parameters; c. a comparator for comparing a measured transmission ratio of the transmission with a reference transmission ratio and for deriving therefrom an adjustment value; d. an adjusting device that receives the preliminary control value and the adjustment value to provide a set point value in order to adjust the measured transmission ratio, wherein the adjusting device adjusts the preliminary control value so that the measured transmission ratio coincides with the reference transmission ratio when the adjustment value is at least approximately zero, to account for changes in transmission operation over time caused by wear of transmission parts.