Electricity: measuring and testing – Internal-combustion engine ignition system or device – In situ testing of spark plug
Patent
1994-01-12
1995-09-12
Snow, Walter E.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
In situ testing of spark plug
324402, F02P 1700
Patent
active
054500133
ABSTRACT:
A spark plug voltage waveform detector probe for use in an internal combustion engine and which is mounted on a secondary circuit of an ignition circuit to form static capacity therebetween so as to detect a spark plug voltage waveform. The detector probe includes an insulator body and an electrode plate which is embedded in the insulator body and electrically connected to a lead wire. A pair of readily replaceable insulator plates are located under the insulator body each of the insulator plates having at least one groove, the at least one groove of each of the insulator plates opposing each other and cooperating to form an opening in which a spark plug cable is placed which is extended from the secondary circuit. Electromagnetic shield plates are provided to liquid-tightly sandwich the insulator body and the insulator plates so as to form a laminated detector probe structure. The electromagnetic shield plates are electrically connected to the internal combustion engine for grounding.
REFERENCES:
patent: 5317268 (1994-05-01), Maruyama et al.
Kondo Noriaki
Miyata Shigeru
NGK Spark Plug Co. Ltd.
Snow Walter E.
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