Discriminator circuit for detecting the event spark plug in a di

Details Discriminator circuit for detecting the event spark plug in a di Discriminator circuit for detecting the event spark plug in a di

1997-08-12

1998-11-24

Brown, Glenn W.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324378, 324393, F02P 1700

Patent

active

058412832

ABSTRACT:
A discriminator circuit for detecting an event spark plug in a distributorless ignition system. The voltage waveform during event and waste cycles of the ignition system is conditioned and applied to a pair of comparators which compare the voltage waveform with different voltage reference levels. Both comparators switch states to a logical high level upon the firing of the event spark plug. The first comparator switches back to a low logical state after the end of the burn time in the event cycle. The second comparator remains in a high logic state following the burn time in the event cycle due to the negative voltage remaining on the spark cable, but switches back to a low logical state after the firing of the event spark plug in the waste cycle when the voltage on the spark plug cable goes positive. A delay element connected to the output of the first comparator holds the output of the first comparator at the high logical for a predetermined time period that is longer than the burn time in the event cycle. When the output of the delay element and the output of the second comparator are both at a logical high state, a gate passes the logical high as an indication signal of detection of the event spark plug. A second delay element may be interposed between the output of the first timer and the logic gate to determine the pulse width of the indication signal.

REFERENCES:
patent: 5510715 (1996-04-01), Takeuchi
patent: 5548220 (1996-08-01), Kawamoto et al.
patent: 5727534 (1998-03-01), Kondo et al.

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