Spark plug firing sensor with capacitive coupling and optical pi

Details Spark plug firing sensor with capacitive coupling and optical pi Spark plug firing sensor with capacitive coupling and optical pi

1991-06-19

1993-05-04

Strecker, Gerard R.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324393, 324402, 324 96, G01R 3100, G01R 19145, G01P 336

Patent

active

052085414

ABSTRACT:
A sensor for detecting the firing of a spark plug while maintaining electrical isolation of electronic equipment is disclosed. In the preferred embodiment, a conductive element is attached to one electrical lead of a neon bulb. A wrap secures one end of an optical fiber to the neon bulb for collecting the light from the neon bulb. The optical fiber carries the light from the neon bulb to a data logging device. During use, the conductive element is secured to an insulated spark plug wire and, when the spark plug fires, a voltage between the leads of the neon bulb is induced, causing the neon bulb to produce a pulse of light. The light pulse from the neon bulb is carried by the optical fiber and monitored by the data logging device. By providing an optical fiber to link the data logging device to the neon bulb, electrical isolation is accomplished.

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patent: 5015944 (1991-05-01), Bubash

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