Double air-fuel ratio sensor system in internal combustion...

F - Mech Eng,Light,Heat,Weapons – 02 – D

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341/38.11

F02D 41/14 (2006.01) F01N 11/00 (2006.01)

Patent

CA 1253595

DOUBLE AIR-FUEL RATIO SENSOR SYSTEM IN INTERNAL COMBUSTION ENGINE ABSTRACT OF THE DISCLOSURE 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 passage, the actual air-fuel ratio is adjusted in accordance with an air-fuel ratio correction amount calculated by using the output of the upstream-side air-fuel ratio sensor and an air-fuel ratio feedback control parameter such as delay time periods, skip amounts, or integration amounts calculated by using the output of the downstream-side air-fuel ratio sensor, and the calculation of the air-fuel ratio feedback control parameter is prohibited when the downstream-side air-fuel ratio sensor is in an abnormal state.

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