Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1993-03-02
1995-05-09
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60277, F01N 320
Patent
active
054129419
ABSTRACT:
A device for determining a deterioration of the catalytic converter for an engine equipped with a catalytic converter disposed in the exhaust passage and upstream and downstream air-fuel ratio sensors disposed in the exhaust passage upstream and downstream of the catalytic converter, respectively. The device also determines whether the three-way catalyst in the catalytic converter has deteriorated based on the output signal of the downstream air-fuel ratio sensor when the air-fuel ratio of the engine is feedback controlled by the output of the upstream air-fuel ratio sensor, wherein the execution of the determining operation of catalyst deterioration is prohibited when the period of the cycle of the air-fuel ratio feedback control becomes longer than a predetermined value, thereby preventing errors from accuracy in the determination.
REFERENCES:
patent: 4739614 (1988-04-01), Katsuno et al.
patent: 5119628 (1992-06-01), Uema et al.
patent: 5134847 (1992-08-01), Ogawa et al.
patent: 5267472 (1993-12-01), Schneider
Clemmens et al., "Detection of Catalyst Performance Loss Using On-Board Diagnostics"; SAE Technical Paper Series No. 900062; Feb. 26-Mar. 2, 1990.
Koupal et al., "Detection of Catalyst Failure On-Vehicle Using the Dual Oxygen Sensor Method"; SAE Technical Paper Series No. 910561; pp. 135-146.
Hayashi Katsuhiko
Itoh Akira
Suzuki Katsuhiro
Hart Douglas
Toyota Jidosha & Kabushiki Kaisha
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