Spark plug voltage probe device for detecting a burning conditio

Details Spark plug voltage probe device for detecting a burning conditio Spark plug voltage probe device for detecting a burning conditio

1992-11-30

1995-06-20

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, 324126, F02P 1700, G01R 19165, G01R 106, G01R 1500

Patent

active

054263700

ABSTRACT:
In a spark plug voltage probe device, an electrically shield casing (301) is provided in which electrical circuit boards (302) are accommodated, the shield casing (301) having an electrically conductive wall (313) connected to the ground. An insulator base (303) is securely attached to an outer bottom of the electrical shield casing (301) and has an electrode plate (332) embedded in the insulator base to be connected to the electrical circuit boards (302). A rubber plate (342) is securely attached to a lower surface of the insulator base (303). A plurality of grooves (333, 341) are provided between the insulator base (303) and the rubber plate (342) to locate the corresponding cables (305) in the grooves (333,341) so as to form a static capacity (C1) between the electrode plate (332) and the cables (305). This makes it possible to reduce a noise level by the ratio of the static capacity (C1) to a static capacity (C2) between the electrically conductive wall (313) and the electrode plate (332). An electrical shield sheet (343) is fixedly attached to the lower surface of the rubber plate (342).

REFERENCES:
patent: 2245604 (1941-06-01), Peters et al.
patent: 2613345 (1952-10-01), Osterland
patent: 3477024 (1969-11-01), Petta
patent: 4090130 (1978-05-01), Willenbecher, Jr.
patent: 4547734 (1985-10-01), Spaude
patent: 5001431 (1991-03-01), Garasimowicz et al.

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