Self-diagnosing apparatus and method of variable valve timing st

Details Self-diagnosing apparatus and method of variable valve timing st Self-diagnosing apparatus and method of variable valve timing st

1998-06-03

2000-08-01

Noori, Max

Measuring and testing

Vehicle chassis

Steering

731181, 123 9016, G01L 326

Patent

active

060949740

ABSTRACT:
In a variable valve timing structure for changing the opening/closing timing of the intake valve and/or the exhaust valve by changing the rotation phase of a cam shaft corresponding to a target value, wherein the deviation between the actual rotation phase at the point of time after a predetermined time has passed from a step-change of the target value and the target value after the step-change is equal to or above a predetermined value, an abnormality of response characteristic of the variable valve timing structure is judged.

REFERENCES:
patent: 5495830 (1996-03-01), Wu
patent: 5549080 (1996-08-01), Uchikawa
patent: 5626108 (1997-05-01), Kato et al.
patent: 5644073 (1997-07-01), Matsuno et al.

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