Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1994-09-14
1995-12-19
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60285, F01N 320
Patent
active
054759757
ABSTRACT:
The air-fuel ratio control device according to the present invention controls the air-fuel ratio of the engine in accordance with the output of the air-fuel ratio sensor disposed on the exhaust gas passage upstream of the three-way reducing and oxidizing catalyst. Further, to compensate for the change in the output characteristics of the upstream air-fuel ratio sensor, the output of the upstream air-fuel ratio sensor is corrected in accordance with the output of another air-fuel ratio sensor disposed on the exhaust gas passage downstream of the catalyst. Since the response of the downstream air-fuel ratio sensor is delayed due to the O.sub.2 storage capacity of the catalyst, the air-fuel ratio control device in the present invention predicts the future value, by a specified time, of the output of the downstream air-fuel ratio sensor based on the history of the change in the output of the upstream air-fuel ratio sensor and the present output of the downstream air-fuel ratio sensor. Since the output of the upstream air-fuel ratio sensor is corrected based on the predicted output of the downstream air-fuel ratio sensor, precise air-fuel ratio control can be achieved by eliminating the delay in the response of the downstream air-fuel ratio sensor caused by the O.sub.2 storage capacity of the catalyst.
REFERENCES:
patent: 4739614 (1988-04-01), Katsuno et al.
patent: 5077970 (1992-01-01), Hamburg
patent: 5088281 (1992-02-01), Izutani
patent: 5203165 (1993-04-01), Wild
patent: 5214915 (1993-06-01), Schneider
Hart Douglas
Toyota Jidosha & Kabushiki Kaisha
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