Electricity: measuring and testing – Internal-combustion engine ignition system or device – Coil
Patent
1992-02-28
1993-05-04
Wieder, Kenneth A.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
Coil
36443104, 123644, G06F 1548, F02P 1700
Patent
active
052085406
ABSTRACT:
The ignition performance monitoring method and apparatus determines the time period during which the current generated in the primary winding of an ignition coil by a pulse from a capacitive discharge ignition system takes the decay to a zero ampere level and uses this determined period to calculate and indicate the firing voltage required to fire a spark plug. The apparatus includes a current sensor connected to sense the current in the primary winding of the ignition coil and a comparator to compare the sensed current with a reference indicative of a zero ampere current level. The comparator provides an output signal having a pulse width indicative of the time the sensed current was above the zero ampere level to a processor which uses the output signal and data values unique to the ignition coil employed to determine a firing voltage for a spark plug fired by the ignition coil.
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Coltec Industries Inc.
Regan Maura K.
Reiter Howard S.
Wieder Kenneth A.
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