Double air-fuel ratio sensor system having improved response cha

Details Double air-fuel ratio sensor system having improved response cha Double air-fuel ratio sensor system having improved response cha

1986-04-11

1987-11-24

Dolinar, Andrew M.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60285, 123489, 123491, F02D 4114

Patent

active

047079843

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 actual air-fuel ratio is adjusted in accordance with the outputs of the upstream-side air-fuel ratio sensor and the downstream-side air-fuel ratio sensor. The adjustment of the actual air-fuel ratio by the downstream-side air-fuel ratio sensor is prohibited in accordance with a coolant temperature of the engine.

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