Double air-fuel ratio sensor system having divided-skip function

Power plants – Internal combustion engine with treatment or handling of... – Methods

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60276, 60285, 123489, F02B 7510, F02D 4114

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active

048541249

ABSTRACT:
In a double air-fuel ratio sensor system including two air-fuel ratio sensors, upstream and downstream of a catalyst converter provided in an exhaust gas passage, a skip amount is calculated in accordance with the output of the downstream-side air-fuel ratio sensor, and a skip operation is performed upon an air-fuel ratio correction amount FAF by the skip amount when the output of the upstream-side air-fuel ratio sensor is switched from the rich side to the lean side, or vice versa. When the skip amount is larger than a predetermined value, the skip amount is divided into a plurality of amounts, thus enabling a plurality of skip operations to be performed upon the air-fuel ratio correction amount FAF.

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