Ignition system tester

Details Ignition system tester Ignition system tester

1982-04-05

1984-05-15

Krawczewicz, Stanley T.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

324380, 324388, 324390, 324399, F02P 1700

Patent

active

044491000

ABSTRACT:
This specification discloses testing vehicle primary ignition systems by taking the integral of the primary spark plug firing voltage versus time over a time period when the spark should occur. To determine when an integration output should be evaluated, a phase locked loop circuit is used to predict the occurrence of an ignition firing pulse. To compensate for changes in engine speed and yet disregard extraneous spark plug firings, the phase locked loop circuit contains two loop filters having different response times which are automatically selected to minimize response to erroneous or missing spark plug firings and maximize response to actual engine RPM changes.

REFERENCES:
patent: 3961240 (1976-06-01), Pohl

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