Double air-fuel ratio sensor system carrying out learning...

Details Double air-fuel ratio sensor system carrying out learning... Double air-fuel ratio sensor system carrying out learning...

F - Mech Eng,Light,Heat,Weapons

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F04B 13/00 (2006.01) F02D 41/14 (2006.01) F04B 17/00 (2006.01) G05D 16/20 (2006.01)

Patent

CA 1256569

DOUBLE AIR-FUEL RATIO SENSOR SYSTEM CARRYING OUT LEARNING CONTROL OPERATION ABSTRACT OF THE DISCLOSURE 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 and downstream-side air-fuel ratio sensors including an air-fuel ratio correction amount. When a change of an air-fuel ratio correction amount or a change of an air-fuel ratio feedback control parameter calculated in accordance with the output of the downstream-side air-fuel ratio sensor is small, a learning correction amount is calculated so that a mean value of the air-fuel ratio correction amount is brought close to a reference value. The actual air-fuel ratio is further adjusted in accordance with the learning correction amount.

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