Continuously variable transmission system for vehicle

摘要

An engine is connected to a sun gear of a planetary gear train via a toroidal type continuously variable transmission. Driven wheels of a vehicle are connected to a ring gear of the planetary gear train. The sun gear and the ring gear are connected to each other by a first clutch. A shifter can connect a second clutch connected to the engine either to a carrier of the planetary gear train or the driven wheels. When the vehicle is started when a failure of the electronic central system has occurred, by engaging the first and second clutches with predetermined engagement forces while the second clutch is connected to the carrier by the shifter, change of the ratio of the toroidal type continuously variable transmission beyond either the LOW ratio or the OD ration is prevented so as to avoid generating an excessive load.