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

WIPO Patent Application WO/2004/068003

A1

A failure determination device for a belt-type stepless speed changer, the device being capable of specifying a failure of a control valve that performs speed change operation and enhancing maintainabilty of the speed changer. While a vehicle is in stop, an ECU controls the speed change ratio of the speed changer so as to be within a LOW-side range for seizure determination. When a speed change ratio while the vehicle is in stop is in an OD-side range at stop, the ECU determines that a DR solenoid valve is in failure when engine torque, TQEG, is equal to or greater than DR-side determination torque at OD, TQDRJD, and a speed change ratio, RATIO, is less than a determination value for DN, RTDNJD. Also, the ECU determines that a DN solenoid valve is in failure when throttle valve opening, TH, is equal to or greater than an OD-side determination value, THDRDNJD, RATIO is equal to or greater than RTDNJD, and a vehicle speed, VP, is less than an OD-side determination value, VDRDNJD.

EGUCHI TAKAHIRO (JP)
OGATA UKYO (JP)
MATSUDA TAKAHIRO (JP)

PCT/JP2004/000744

August 12, 2004

January 28, 2004

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HONDA MOTOR CO LTD (JP)
EGUCHI TAKAHIRO (JP)
OGATA UKYO (JP)
MATSUDA TAKAHIRO (JP)

F16H61/12; G01M99/00; F16H61/662; (IPC1-7): F16H61/12

JPH08127261A	1996-05-21
JPH08178047A	1996-07-12
JPH10246320A	1998-09-14
JPH11280886A	1999-10-15
JPH09317873A	1997-12-12
JPH08326855A	1996-12-10
JPH04211777A	1992-08-03
JPS60157553A	1985-08-17
JPH02176265A	1990-07-09
JP2002039352A	2002-02-06

See also references of EP 1589263A4

Takahashi, Tomoo (11-5 Shiba 4-chome, Mimato-k, Tokyo, JP)

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