Combustion state-detecting system for internal combustion engine

Details Combustion state-detecting system for internal combustion engine Combustion state-detecting system for internal combustion engine

1993-09-15

1996-02-27

Chilcot, Jr., Richard E.

Measuring and testing

Test stand

For engine

731173, 36443107, 36443108, 123419, 123436, G01M 1500

Patent

active

054939011

ABSTRACT:
A combustion state-detecting system for internal combustion engines has a crank angle sensor which generates a crank angle signal with a predetermined period shorter than a firing period of the engine whenever the crankshaft rotates through a predetermined angle. A value of the rotational speed of the engine is detected whenever the crank angle signal is generated. A first average value of the detected engine rotational speed is calculated over every period of one rotation of the crankshaft, followed by calculating a second average value of the first average value over every firing period, to thereby calculate a rate of variation in the second average value over every firing period. Values of the rate of variation are averaged over a predetermined number of ignition cycles of the engine, to obtain a third average value. A cumulative value of the absolute value of a difference between the third average value and the rate of variation is calculated over the above predetermined number of ignition cycles. The cumulative value is compared with a predetermined value, to determine that the engine is in a degraded state of combustion, when the cumulative value exceeds the predetermined value.

REFERENCES:
patent: 5044195 (1991-09-01), James et al.
patent: 5117681 (1992-06-01), Dosdall et al.
patent: 5197325 (1993-03-01), Tamura et al.
patent: 5200899 (1993-04-01), Ribbens et al.
patent: 5245866 (1993-09-01), Hashiguchi et al.
patent: 5263364 (1993-11-01), Nakayama et al.
patent: 5313395 (1994-05-01), Kawai et al.

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