The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 2008
Filed:
Jan. 28, 2004
Takahiro Eguchi, Saitama-ken, JP;
Ukyo Ogata, Saitama-ken, JP;
Takahiro Matsuda, Saitama-ken, JP;
Honda Motor Co., Ltd., Tokyo, JP;
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≧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.