Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1991-03-25
1992-12-08
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60285, 123674, 123691, F01N 320
Patent
active
051687011
ABSTRACT:
This invention relates to a method of controlling the air-fuel ratio of an internal combustion engine having a main 0.sub.2 sensor and a subsidiary O.sub.2 sensor provided upstream and downstream, respectively, of a catalyst converter for detecting the oxygen concentration of the exhaust gas of the engine. The method comprises: feedback-controlling the air-fuel ratio of a mixture gas to be supplied to the engine to about a stoichiometric air-fuel ratio having the highest purification efficiency of the exhaust gas by adjusting the amount of fuel to be supplied by an injector in accordance with the output signal from the main O.sub.2 sensor; and also feedback-controlling more precisely the air-fuel ratio of the mixture gas to about the stoichiometric air-fuel ratio by adjusting the amount of fuel supply in accordance with the output signal of the subsidiary O.sub.2 sensor. The feedback control value set for adjusting the amount of fuel supply in accordance with the output signal of the subsidiary O.sub.2 sensor is usually increased or decreased by a predetermined value. When a change of the air-fuel ratio from the rich to the lean side or from the lean to the rich side is detected by the output signal of the subsidiary O.sub.2 sensor, the feedback control value is increased or decreased by a skip amount.
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Iwakura You-ichi
Kajitani Katsuyuki
Yamamoto Toshio
Daihatsu Motor Co. Ltd.
Hart Douglas
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