Internal combustion engine misfire detection with engine acceler

Details Internal combustion engine misfire detection with engine acceler Internal combustion engine misfire detection with engine acceler

1997-10-17

2000-02-08

Dombroske, George

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

73116, 731173, 123436, G01M 1500

Patent

active

060236515

ABSTRACT:
To accurately detect patterns of misfires in an internal combustion engine, misfire is detected by calculating angular speed variation responsive to crankshaft rotation and comparing that with a predetermined misfire reference value. The calculated angular speed variation includes a first elementary term showing rotational variation of two different cylinders and a second correction term showing the rotational variation of the same cylinder separated by one combustion cycle. The elementary term shows how much rotational variation is between the cylinder n and the previous cylinder n-1 due to the occurrence of misfire. In contrast, the correction term shows how much error in the rotational variation is caused in same cylinder (e.g., mainly when accelerating or decelerating).

REFERENCES:
patent: 5245866 (1993-09-01), Hashiguchi et al.
patent: 5275037 (1994-01-01), Nakayama et al.
patent: 5497328 (1996-03-01), Sugai et al.
patent: 5499537 (1996-03-01), Nakayama et al.
patent: 5670713 (1997-09-01), Machida et al.
patent: 5689065 (1997-11-01), Kuroda et al.

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