Patent Number: 7,356,399

Title: Failure determination system for stepless speed changer and failure determination device for start clutch

Abstract: 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.gtoreq.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.gtoreq.OD-side reference value, the transmission ratio.gtoreq.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.

Inventors: Eguchi; Takahiro (Saitama-ken, JP), Ogata; Ukyo (Saitama-ken, JP), Matsuda; Takahiro (Saitama-ken, JP)

Assignee: Honda Motor Co., Ltd.

International Classification: G06F 7/00 (20060101); G06F 17/00 (20060101); G06F 19/00 (20060101)

Expiration Date: 2020-04-08 0:00:00