Electromagnetically driven valve control apparatus and method fo

Details Electromagnetically driven valve control apparatus and method fo Electromagnetically driven valve control apparatus and method fo

1998-12-15

2000-04-04

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Electrical system

25112901, 335266, F01L 904

Patent

active

060448148

ABSTRACT:
A control apparatus for a valve of an internal combustion engine electrically opens and closes an intake or exhaust valve of the internal combustion engine with reduced power consumption while securing stable operating characteristics. The electromagnetically driven valve is opened and closed by combining an electromagnetic force produced by upper and lower electromagnets and an elastic force produced by upper and lower springs. At a timing at which one of the upper and lower electromagnets is to attract the valve, a predetermined attracting current is supplied to the respective one of the upper and lower electromagnets, and it is detected whether there is a step out of the valve. If a step out is detected, the attracting current applied to the respective one of the upper and lower electromagnets in the next cycle is increased. If the step out is not detected, the attracting current used in the next cycle is decreased.

REFERENCES:
patent: 4794891 (1989-01-01), Knobloch
patent: 5636601 (1997-06-01), Moriya et al.
patent: 5671705 (1997-09-01), Matsumoto et al.
patent: 5748433 (1998-05-01), Schrey et al.
patent: 5775276 (1998-07-01), Yanai et al.
patent: 5782211 (1998-07-01), Kamimaru
patent: 5889405 (1999-03-01), Yanai et al.

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