Double air-fuel ratio sensor system having improved exhaust emis

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

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60276, 60285, 123489, F02D 4114

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active

048173843

ABSTRACT:
In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, an air-fuel ratio correction amount is calculated in accordance with the outputs of the upstream-side and downstream-side air-fuel ratio sensors, thereby obtaining an actual air-fuel ratio. The air-fuel ratio correction amount is guarded within a predetermined range. When this correction amount reaches the maximum or minimum value of the range, the calculation of the air-fuel ratio correction amount by the output of the downstream-side air-fuel ratio sensor is prohibited.

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