Method for detecting misfires in gasoline internal combustion en

Details Method for detecting misfires in gasoline internal combustion en Method for detecting misfires in gasoline internal combustion en

1992-02-28

1994-05-03

Raevis, Robert

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

053076710

ABSTRACT:
In a method of detecting misfires in a gasoline internal combustion engine, the angular velocities of rotation of the engine detected by an angular velocity sensor are calculated over a period of time, and when the difference between the average value of the angular velocities of rotation and the maximum or minimum value thereof is equal to or larger than a predetermined threshold value, the occurrence of misfires is determined. The threshold value is changed according to the operating conditions of the engine such as engine speed or load. Thus, in the method, most suitable, threshold values are set over wide ranges spanning from low speed to high speed, and from light load to heavy load. The abnormal rotation of the engine due to misfires can thereby be with high accuracy.

REFERENCES:
patent: 5041980 (1991-08-01), Maddock et al.
patent: 5088318 (1992-02-01), Osawa
patent: 5095742 (1992-03-01), James
patent: 5105657 (1992-04-01), Nakaniwa

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