Engine cycle identification from engine speed

Details Engine cycle identification from engine speed Engine cycle identification from engine speed

1995-03-20

1996-10-08

Nelli, Raymond A.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

F02P 514

Patent

active

055620825

ABSTRACT:
An internal combustion engine has a crankshaft sensor with an uneven tooth spacing to identify an index tooth corresponding in position to top dead center (TDC) of the number 1 cylinder. A microprocessor based engine controller determines from the sensor pulses each TDC event. During cranking, the number 1 cylinder compression stroke is detected from engine speed variations by measuring time periods over sample ranges before and after TDC. When a compression stroke occurs just before TDC, the period before TDC is greater than the period after TDC, whereas other TDC events are evidenced by the period before TDC being smaller than or equal to the period after TDC.

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