Method of detecting fault in electromagnetically-actuated intake

Details Method of detecting fault in electromagnetically-actuated intake Method of detecting fault in electromagnetically-actuated intake

1997-05-23

1999-03-30

Do, Diep N.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324418, 324546, 32420716, 324535, 123 9011, 137554, 361154, G01R 3102, F16K 3102, F01L 904

Patent

active

058894055

ABSTRACT:
A method of detecting a fault of an electromagnetically-actuated intake/exhaust valve is disclosed. A valve body is supported in neutral position by the energizing force of an elastic member, and the electromagnetic force generated by supplying a current to the coils arranged on the two sides of a plunger is applied to the plunger thereby to operate the valve. A fault is detected based on a change of the current flowing in one coil attracting and holding the plunger with the inductance change of the same coil when the plunger is switched from the position of the same coil to the position of the other coil. This method improves the fault detection accuracy for the electromagnetically-actuated intake/exhaust valve over the prior art.

REFERENCES:
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patent: 4809742 (1989-03-01), Grau
patent: 4823825 (1989-04-01), Buchl
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patent: 5109675 (1992-05-01), Hwang
patent: 5424637 (1995-06-01), Oudyn et al.
patent: 5450270 (1995-09-01), Takahashi
patent: 5477149 (1995-12-01), Spencer et al.

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