Powertrain control module spark duration diagnostic system

Details Powertrain control module spark duration diagnostic system Powertrain control module spark duration diagnostic system

2006-10-17

2006-10-17

Dolinar, Andrew M. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C324S388000, C324S399000

Reexamination Certificate

active

07124019

ABSTRACT:
A system and method for diagnosing ignition system performance of an internal combustion engine. The method operates an engine control unit to produce a sequence of spark ignition current pulses through primary windings of a plurality of ignition coils. The current pulses produce voltage pulses across electrodes of the spark plugs. The voltage pulses produce flyback voltages across the primary windings. Output pulses are produced in response to the flyback voltages having time durations related to the time durations of the sparks produced by the spark plugs. Digital signal are produced in response to each one of the output pulses representative of the spark time duration of a corresponding one of the sparks. A comparison of the digital signals determines whether the spark time duration of one of the spark plugs is substantially different from the spark time durations of the other ones of the plurality of spark plugs.

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