Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1994-09-26
1995-08-15
Lazarus, Ira S.
Power plants
Internal combustion engine with treatment or handling of...
Methods
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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Kamura Hitoshi
Kojima Atsuyoshi
Noma Kazutoshi
Lazarus Ira S.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
O'Connor Daniel J.
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