Spark plug voltage probe device for use in an internal combustio

Details Spark plug voltage probe device for use in an internal combustio Spark plug voltage probe device for use in an internal combustio

1994-04-28

1995-12-19

Strecker, Gerard R.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

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

324126, 324393, F02P 1712, F02P 1700, G01R 19165, G01R 106

Patent

active

054771480

ABSTRACT:
In a spark plug voltage probe device which detects voltage applied to a spark plug installed in an internal combustion engine so as to analyze burning conditions in the internal combustion engine on the basis of the voltage applied to the spark plug, a rubber collar (74) is provided to surround rubber cap (7) secured to high tension terminal (71a) of spark plug (71) so as to form a static capacity between high tension terminal (71a) and rubber collar (74). Electrical conductor (73) is provided between rubber cap (7) and rubber collar (74), and conductor (73) is electrically connected to a microcomputer by output cable (64) so as to analyze the spark plug voltage waveform. Condenser (42) is connected at one end to the ground and the other end to a common point (A) between electrical conductor (73) and the microcomputer so as to reduce the spark plug voltage according to the capacity of condenser (42).

REFERENCES:
patent: 3538440 (1970-11-01), Galloway
patent: 3657650 (1972-04-01), Arndt
patent: 3743922 (1973-07-01), Festos
patent: 3970932 (1976-07-01), Harvey
patent: 4041373 (1977-08-01), Maringer
patent: 4306187 (1981-12-01), Kinder
patent: 4547734 (1985-10-01), Spaude

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