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

1993-09-10

1995-05-16

Chilcot, Jr., Richard E.

Measuring and testing

Vehicle chassis

Steering

F02D 4500, G01M 1500

Patent

active

054150353

ABSTRACT:
A combustion state-detecting system, for internal combustion engines, has a crank angle sensor. The crank angle sensor 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 a 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. The rate of variation is compared with a predetermined value, to determine whether or not the engine is in a degraded state of combustion.

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patent: 5307671 (1994-05-01), Akase
patent: 5309756 (1994-05-01), Osawa et al.

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