System for detecting combustion state in internal combustion eng

Details System for detecting combustion state in internal combustion eng System for detecting combustion state in internal combustion eng

1991-02-19

1991-12-31

Myracle, Jerry W.

Measuring and testing

Vehicle drive train

Rear end

G01M 1500

Patent

active

050760980

ABSTRACT:
A system for detecting combustion state in an internal combustion engine, detects cylinder pressures in a detecting range from 120.degree. to 240.degree. of crank angle, i.e. from 60.degree. BTDC and 60.degree. ATDC positions, for respective cylinders by means of cylinder pressure sensors, to predict cylinder pressures in a range other than the detecting range in compression and expansion strokes. On the basis of these cylinder pressures, the system derives an indicated mean effective pressure P.sub.i.sup.+ i. This indicated mean effective pressure P.sub.i.sup.+ i is used for determining occurence of misfire in the engine.

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