Electricity: measuring and testing – Internal-combustion engine ignition system or device – In situ testing of spark plug
Patent
1991-06-26
1993-04-20
Harvey, Jack B.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
In situ testing of spark plug
340650, F02P 1700
Patent
active
052046303
ABSTRACT:
A device for and method of providing reliable audible and visual warnings of incipient preignition in a combustion chamber is disclosed. The current flow through at least one engine spark plug is monitored at specified times throughout a number of engine revolutions during which there should be no current flow and both an audible alarm and a visible alarm are activated in the event the monitored current flow exceeds a predetermined threshold. Circuitry establishes time intervals during which there should be no current flow through the monitored spark plug and additional circuitry temporarily provides both an audible alarm and a visible alarm for each occurrence of the monitored current exceeding the predetermined threshold. Such a temporary alarm typically has the same duration as the detected excess current. There is also circuitry for continuously enabling both the audible and visible alarms in the event of an excessive number of excessive monitored current flows within a specified length of time.
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Seitz William R.
Smith David M.
Taylor Richard D.
Allied Signal Inc.
Decker Ken C.
Harvey Jack B.
McCormick Leo H.
Regan Maura K.
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