FAILURE DETERMINATION DEVICE FOR STEPLESS SPEED CHANGER AND FAILURE DETERMINATION DEVICE FOR START CLUTCH

摘要

There is provided a failure determination system for a continuously variable transmission of a belt type, which is capable of determining failure of control valves for performing speed varying operation, and enhancing maintainability. An ECU controls a transmission ratio of the transmission to a fixation-determining LOW-side range when the vehicle is standing. When the transmission ratio during stoppage of the vehicle is within a stop-time OD-side range if engine torque /= OD-time DR-side reference torque and at the same time the transmission ratio DN-side reference value hold, the ECU determines that the DR solenoid valve is faulty, and if the throttle valve opening /= OD-side reference value, the transmission ratio /= DN-side reference value, and at the same time a vehicle speed OD-side reference value hold, the ECU determines that the DN solenoid valve is faulty. IMAGE