Method and arrangement for shifting the lambda mean value

Details Method and arrangement for shifting the lambda mean value Method and arrangement for shifting the lambda mean value

1992-10-19

1993-08-31

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114

Patent

active

052399753

ABSTRACT:
The invention is directed to a method of shifting the lambda value to that value at which a control in time average is effected with a two-point lambda control for an internal combustion engine. The method includes the steps of: forming a control deviation between the current value of a variable, which indicates the lambda value of the engine exhaust gas, and a pregiven fixed value; integrating to form an output variable component with the integration being in the direction of higher integration values in the presence of a control deviation indicating a lean mixture, and in the direction of lower integration values in the presence of a control deviation indicating a rich mixture; temporarily stopping the integration when there is a sign change of the control deviation to that sign which belongs to the desired lambda value shift, the lambda value shift being defined as a stop sign; utilizing an integration stop time span which is then always reset anew when the previous integration stop time span has run; and, permitting an integration stop over the entire integration stop time span when the output variable lies in that value range which belongs to the shift of the lambda mean value in the desired direction. The actual integration stop time span is provided only for the rich region of the control deviation. In this way, an unwanted shift of the lambda mean value in the lean direction does not occur with disturbances.

REFERENCES:
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patent: 4210106 (1980-07-01), Wessel et al.
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patent: 4461258 (1984-07-01), Becker et al.
patent: 4522180 (1985-06-01), Matsuoka et al.
patent: 4528962 (1985-07-01), Auth
patent: 5048494 (1991-09-01), Fujimoto et al.

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