System for detecting combustion condition of an internal combust

Details System for detecting combustion condition of an internal combust System for detecting combustion condition of an internal combust

1992-02-20

1993-06-29

Raevis, Robert

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

052223949

ABSTRACT:
A period when the combustion of an engine is not performed is detected at two points before and after the top dead center of the cylinder in the expansion stroke. Engine speeds in both the periods are detected and the speed difference between the detected periods is calculated. Mean speed difference is calculated. The mean speed difference is compared with a predetermined limit value, thereby estimating combustion condition of the cylinder.

REFERENCES:
patent: 4532798 (1985-08-01), Kohama et al.
patent: 4977508 (1990-12-01), Tanaka et al.
patent: 5041981 (1991-08-01), Sekozawa et al.

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