Fault determining apparatus, fault determining method and...

Details Fault determining apparatus, fault determining method and... Fault determining apparatus, fault determining method and...

2005-04-26

2005-04-26

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Performance or efficiency evaluation

C702S136000, C702S183000, C073S117020, C123S090190, C123S090150

Reexamination Certificate

active

06885976

ABSTRACT:
A fault determining apparatus for a variable valve timing mechanism is provided for shortly and accurately determining a fault even at low oil temperatures. The mechanism is driven by an oil pressure to change a cam phase of an intake cam and/or an exhaust cam with respect to a crank shaft of an internal combustion engine, thereby controlling the actual cam phase to reach a target cam phase. The apparatus has a fault determining routine executed by an ECU (electric control unit) for determining that the mechanism is faulty when a cam phase difference between the target cam phase and the actual cam phase is not within a predetermined range, an oil temperature sensor for detecting the temperature of the working oil, and a correcting routine executed by the ECU for correcting the predetermined range in an increasing direction when the detected oil temperature is low.

REFERENCES:
patent: 5537961 (1996-07-01), Shigeru et al.
patent: 5979378 (1999-11-01), Matsuno et al.
patent: 6094974 (2000-08-01), Yamagishi et al.
patent: 6330870 (2001-12-01), Inoue et al.
patent: 8-232617 (1996-09-01), None

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