Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1987-08-11
1989-04-04
Dolinar, Andrew M.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60285, 123489, F02D 4114
Patent
active
048173843
ABSTRACT:
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 air-fuel ratio correction amount is calculated in accordance with the outputs of the upstream-side and downstream-side air-fuel ratio sensors, thereby obtaining an actual air-fuel ratio. The air-fuel ratio correction amount is guarded within a predetermined range. When this correction amount reaches the maximum or minimum value of the range, the calculation of the air-fuel ratio correction amount by the output of the downstream-side air-fuel ratio sensor is prohibited.
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Kawase Takashi
Okumura Atsuo
Ujino Masato
Dolinar Andrew M.
Toyota Jidosha & Kabushiki Kaisha
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