Valve timing control system for an internal combustion engine

Details Valve timing control system for an internal combustion engine Valve timing control system for an internal combustion engine

2005-08-02

2005-08-02

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090160, C123S090170

Reexamination Certificate

active

06923150

ABSTRACT:
A valve timing control system for an internal combustion engine is provided, which includes: a crank angle sensor detecting a crank angle corresponding to an internal combustion engine crank shaft rotational angle; an actuator relatively modifying phases of a cam angle with the crank angle; a cam angle sensor detecting the cam angle modified by the actuator; an oil control valve driving the actuator; a target value detection unit calculating a target value according to the internal combustion engine operation state; a cam angle control unit controlling the detected cam angle to coincide with the calculated target value; a learning unit learning a control signal to the oil control valve when the cam angle substantially coincides with the target value; and a failure detection unit detecting failure of the actuator. The failure detection unit modifies a failure detection condition according to whether learning is performed in the learning unit.

REFERENCES:
patent: 5333577 (1994-08-01), Shinojima
patent: 5664529 (1997-09-01), Kato et al.
patent: 5715779 (1998-02-01), Kato et al.
patent: 06-159105 (1994-06-01), None
patent: 2000-064862 (2000-02-01), None

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