Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1996-03-19
1998-01-13
Wolfe, Willis R.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60285, 123674, F01N 320, F02D 4114
Patent
active
057066540
ABSTRACT:
In the present invention, the air-fuel ratio of an engine is controlled by a fist air-fuel ratio control based on the output of an O.sub.2 sensor disposed in an exhaust gas passage downstream of a catalytic converter, and by a second air-fuel ratio control based on the output of an O.sub.2 sensor disposed downstream of the catalytic converter. The first air-fuel ratio control determines the air-fuel ratio correction factor FAF in accordance with the output of the downstream O.sub.2 sensor and a second air-fuel ratio correction factors RSR and RSL. The second air-fuel ratio control determines the values of RSR and RSL in accordance with the output of upstream O.sub.2 sensor. Further, a learning correction of FAF is performed in such a manner that the center value of the fluctuation of FAF agrees with a reference value. When the center value of FAF deviates from the reference value, since the values RSR and RSL fluctuate largely, the fluctuation of FAF also becomes large. This may cause an error in the learning correction. In the present invention, when the center value of FAF deviates from the reference value, the rate of change in the values RSR and RSL is reduced, to thereby suppress the fluctuation thereof. Therefore, the fluctuation of FAF is also suppressed to prevent an error in the learning correction from occurring without interrupting the second air-fuel ratio control.
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Toyota Jidosha & Kabushiki Kaisha
Wolfe Willis R.
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