KONTROLLSYSTEM FUER EIN STUFENLOSES VARIABLES GETRIEBE EINES VIERRADKRAFTFAHRZEUGES

摘要

A belt drive continuously variable transmission of a four-wheel motor vehicle has a transmission ratio control valve which is operated in accordance with driven pulley speed. An analogous driven-pulley speed is calculated based on an analogous vehicle speed approximate to actual vehicle speed. In response to the analogous driven-pulley speed, the analogous driven pulley speed is used for operating the transmission ratio control valve instead of the driven pulley speed.