Internal-combustion engines – Spark ignition timing control – Electronic control
Patent
1993-03-03
1994-07-12
Nelli, Raymond A.
Internal-combustion engines
Spark ignition timing control
Electronic control
123630, F02P 500
Patent
active
053278674
ABSTRACT:
A misfire-detecting system for an internal combustion engine carries out self-diagnosis of the system. In the system, sparking voltage generated across a spark plug of a cylinder of the engine is detected, and the detected sparking voltage is compared with a first predetermined reference voltage value, and a time period is measured over which the detected sparking voltage exceeds the first predetermined reference voltage value. It is determined that a misfire occurred in the engine when the measured time period exceeds a predetermined time period value. It is determined whether the engine is in self-sustaining operation. When it is determined that the engine is in self-sustaining operation, it is determined whether the misfire-detecting system is abnormal. It is determined that the misfire-detecting system is abnormal when the detected sparking voltage is lower than a second reference voltage value. Alternatively or in combination, it is determined that the misfire-detecting system is abnormal when the detected sparking voltage has continued to be higher than a third predetermined reference voltage value over a predetermined time period.
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Baba Shigeki
Chikamatsu Masataka
Hisaki Takashi
Ishioka Takuji
Kakimoto Kazuhito
Honda Giken Kogyo Kabushiki Kaisha
Nelli Raymond A.
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