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

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

F - Mech Eng,Light,Heat,Weapons

02

D

354/24

F02D 41/14 (2006.01)

Patent

CA 1256568

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. Accordingly, only when the change of the intake air density is large, is a learning correction amount calculated so that a means 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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