Misfire diagnostic system for internal combustion engine

Details Misfire diagnostic system for internal combustion engine Misfire diagnostic system for internal combustion engine

1996-11-15

1999-02-09

Dombroske, George M.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

73116, 731173, 123419, 123436, G01M 1500, F02D 4500

Patent

active

058706887

ABSTRACT:
A misfire diagnostic system for an Internal combustion engine comprises a crank-shaft angle sensor for monitoring a crankshaft angular velocity reflecting a combusting condition of each of engine cylinders, and a control unit for calculating an angular-velocity correction factor of each of the engine cylinders on the basis of the angular velocity in every engine operating region only under a stable engine operating condition. The control unit corrects the angular velocity by the angular-velocity correction factor of each of the engine cylinders for every engine operating region. The presence of a misfire is accurately decided on the basis of the angular velocity corrected for every engine cylinder and for every engine operating region.

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patent: 5452604 (1995-09-01), Namiki et al.
patent: 5522256 (1996-06-01), Hashimoto et al.
patent: 5567873 (1996-10-01), Toyoda

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