Diagnostic apparatus for valve timing control system

Details Diagnostic apparatus for valve timing control system Diagnostic apparatus for valve timing control system

2006-05-02

2006-05-02

McCall, Eric S. (Department: 2855)

Measuring and testing

Vehicle chassis

Steering

Reexamination Certificate

active

07036358

ABSTRACT:
A diagnostic apparatus of a valve timing control system in which a valve timing is variably controlled by changing a rotational phase between a crankshaft and a cam shaft of an engine. The apparatus has a detector for detecting a fluctuation of engine speeds of the engine following a change of engine operating conditions and for calculating a diagnosis value based on the fluctuation; and a comparator for comparing the diagnosis value with a preestablished threshold value and for judging that a failure occurs in the valve timing control system, in case where the diagnosis value exceeds the threshold value.

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patent: 2001-20798 (2001-01-01), None

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