Misfire diagnosis method and apparatus of internal combustion en

Details Misfire diagnosis method and apparatus of internal combustion en Misfire diagnosis method and apparatus of internal combustion en

1998-03-09

2000-02-15

Oen, William

Measuring and testing

Vehicle chassis

Steering

73116, 731172, 701110, G01L 326

Patent

active

060239646

ABSTRACT:
The present invention relates to an apparatus for diagnosing misfire of an internal combustion engine. With this invention, crank angle intervals for detecting angular velocity for each cylinder are variably set for each operation region. An average value of a predetermined number of misfire judgment values M1 set based on a plurality of angular velocities is compared with a reference value, to thereby carry out misfire diagnosis distinguishably of a misfire in a single cylinder or misfires in multiple cylinders.

REFERENCES:
patent: 5044195 (1991-09-01), James et al.
patent: 5287737 (1994-02-01), Asawa et al.
patent: 5301546 (1994-04-01), Inada et al.
patent: 5728941 (1998-03-01), Yamamoto et al.
patent: 5747681 (1998-05-01), Kuroda et al.
patent: 5832404 (1998-11-01), Amano
patent: 5906651 (1999-05-01), Amano

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