Air-fuel ratio controller for an internal combustion engine

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

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Details

60276, 60285, 123695, 123703, F01N 320

Patent

active

054408776

ABSTRACT:
An alr-fuel ratio controller for-an internal-combustion engine is provided with front and rear O.sub.2 sensors respectively installed in the exhaust system on the upstream and downstream sides of an exhaust gas purifier. The controller corrects the air-fuel ratio in accordance with the result of the comparison between a detected value of the front O.sub.2 sensor and a first reference value, to thereby control the alr-fuel ratio to a desired value, and also corrects a value of a parameter related preferably to at least one of a correction amount or a correcting timing for the air-fuel ratio correction, e.g., the first reference value, in accordance with the deviation between a detected value of the rear O.sub.2 sensor and a second reference value. When the deviation is large in magnitude, the parameter value is corrected at a larger correction degree than that used when the deviation magnitude is small, to thereby nonlinearly correct the parameter value in accordance with the magnitude of the deviation, whereby optimized correction of the parameter value is achieved so as to prevent the degeneration of the exhaust gas performance caused by the deterioration of the front and rear O.sub.2 sensors or catalyst concerned.

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