Continuous cylinder misfire detection method

Details Continuous cylinder misfire detection method Continuous cylinder misfire detection method

2006-11-28

2006-11-28

Vo, Hieu T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C073S117020, C123S406200

Reexamination Certificate

active

07142972

ABSTRACT:
A method and system for detection of continuous single cylinder misfire, by more completely analyzing an estimated periodic sequence of reference period signals, and comparing the periodic sequence with a sample corresponding to an immediately prior revolution, is offered. Data occurring periodically, with a period of one revolution, are eliminated, whereas signals associated with a period of one engine cycle are enhanced. This comprises measuring a sequence of engine reference periods corresponding to a single engine revolution. Transient noise is removed. A first difference is calculated, and a disturbance sequence is estimated, correlatable to a single engine cycle. A difference is calculated and compared to a threshold. The threshold comprises an array of calibrated values, determined based upon engine operating speed and engine load.

REFERENCES:
patent: 5668725 (1997-09-01), Naik
patent: 6439198 (2002-08-01), Lehner et al.
patent: 6659077 (2003-12-01), Morikami
patent: 7-34960 (1995-02-01), None

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