Variable valve timing controller for internal combustion engine

Details Variable valve timing controller for internal combustion engine Variable valve timing controller for internal combustion engine

2007-12-18

2007-12-18

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S090160, C123S090310, C123S090110

Reexamination Certificate

active

11213900

ABSTRACT:
A variable valve timing controller adjusts valve timing of an intake valve and/or an exhaust valve by varying a motor speed relative to a camshaft. When an engine is running under a predetermined condition, an actual valve timing is calculated based on a cam angle signal and crank angle signal every when the cam angle signal is inputted. A final valve timing is calculated by adding a valve timing variation amount to the actual valve timing at the time the cam angle signal is outputted. The valve timing amount is periodically calculated based on a difference between a motor speed and a rotational speed of the intake camshaft. When the engine is running under another condition, only actual valve timing at the time the cam angle signal is outputted is calculated.

REFERENCES:
patent: 3978829 (1976-09-01), Takahashi et al.
patent: 6405694 (2002-06-01), Sato
patent: 7059285 (2006-06-01), Schafer et al.
patent: 7077087 (2006-07-01), Tani
patent: 7107951 (2006-09-01), Urushihata et al.
patent: 2006/0124095 (2006-06-01), Schafer et al.
U.S. Appl. No. 10/510,765, filed Oct. 23, 2003 in the name of Urushihata et al for Variable Valve Timing Control Device of Internal Combustion Engine.

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