Valve operating apparatus of internal combustion engine

Details Valve operating apparatus of internal combustion engine Valve operating apparatus of internal combustion engine

1996-01-11

1997-03-18

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Electrical system

123 9012, 123 9014, F01L 904

Patent

active

056113030

ABSTRACT:
A valve operating apparatus includes a biasing unit which applies a biasing force to a valve element so that the valve element is held at a neutral position. A first solenoid coil generates an electromagnetic force to move the valve element in a valve-closing direction. A second solenoid coil generates an electromagnetic force to move the valve element in a valve-opening direction. A stroke-length modifying unit changes a position of the second solenoid coil relative to the first solenoid coil in an axial direction of the valve element in accordance with an operating condition of an engine so that a length of a stroke of the valve element is modified. A neutral-position modifying unit changes the neutral position of the valve element to a new neutral position in accordance with the operating condition of the engine.

REFERENCES:
patent: 4256065 (1981-03-01), Hirt
patent: 4777915 (1988-10-01), Bonvallet
patent: 5131624 (1992-07-01), Kreuter et al.
patent: 5347961 (1994-09-01), Buehrle, II et al.
SAE Paper No.940816, "Control of Engine Load via Electromagnetic Valve Actuators", Mark A. Theobald et al.

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