Apparatus and method for detecting output fluctuations of an int

Details Apparatus and method for detecting output fluctuations of an int Apparatus and method for detecting output fluctuations of an int

1996-02-22

1997-07-29

Dombroske, George M.

Measuring and testing

Test stand

For engine

73115, 731173, 123435, 36443103, F02D 4114, F02D 4500, G01M 1500

Patent

active

056523807

ABSTRACT:
A standard deviation and mean value of a value for the cylinder pressure integrated over a predetermined interval are computed. A value for the standard deviation divided by the mean value is then made an index value for judging a limit of output fluctuations. When the index value is less than a predetermined value corresponding to the output fluctuations, then weakening of the air-fuel ratio and retarding of the ignition timing is proceeded, while when the index value is equal to or greater than the predetermined value, it is judged that the limit of the output fluctuations has been exceeded, and the air-fuel ratio is corrected to the rich side, and the ignition timing is corrected to the advance side.

REFERENCES:
patent: 4802454 (1989-02-01), Tanaka
patent: 4885935 (1989-12-01), Feller et al.
patent: 4892075 (1990-01-01), Iriyama et al.
patent: 5069183 (1991-12-01), Nagano et al.
patent: 5386722 (1995-02-01), Meyer et al.
patent: 5499607 (1996-03-01), Tomisawa

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