Sparkplug voltage probe for use with an internal combustion engi

Details Sparkplug voltage probe for use with an internal combustion engi Sparkplug voltage probe for use with an internal combustion engi

1994-06-20

1996-08-06

O'Shea, Sandra L.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Apparatus for coupling a measuring instrument to an ignition...

324393, F02P 1700, G01R 1342, G01R 106

Patent

active

055437168

ABSTRACT:
In a sparkplug voltage probe device in use for an internal combustion engine, an insulator base is attached to the internal combustion engine, an upper surface of the insulator base having a plurality of grooves in which the sparkplug cables are placed. An insulator sheet is embedded in the insulator base. An electrode layer is provided on an upper surface of the insulator base along the grooves to form a static capacity between the electrode layer and the sparkplug cables when the voltage is applied across the spark plugs. On a lower surface of the insulator sheet an electrical shield layer is provided connected to the internal combustion engine by a ground wire. A lead wire electrically connects the electrode plate to a microcomputer so as to analyze the engine burning condition based on the static capacity between the electrode plate and the sparkplug cables.

REFERENCES:
patent: 4090130 (1978-05-01), Willenbeches
patent: 4159441 (1979-06-01), Livingston
patent: 4547734 (1985-10-01), Spaude
patent: 4691667 (1987-09-01), Eberhardt et al.
patent: 4875457 (1989-10-01), Fitzner
patent: 5175505 (1992-12-01), Magenau et al.
patent: 5307017 (1994-04-01), Maruyama et al.
patent: 5317267 (1994-05-01), Miyata et al.
patent: 5317268 (1994-05-01), Maruyama et al.

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