Device for determining deterioration of a catalytic converter fo

Details Device for determining deterioration of a catalytic converter fo Device for determining deterioration of a catalytic converter fo

1992-10-06

1994-04-19

Kamen, Noah P.

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60274, 60276, 60285, F02B 1900

Patent

active

053035488

ABSTRACT:
A device for determining deterioration of a 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, wherein the device calculates the area surrounded by the output response curve of the downstream air-fuel ratio sensor and a predetermined reference value line, the device determining whether or not the catalyst is deteriorated in accordance with the area calculated when the output of downstream air-fuel ratio sensor stays on a rich side or lean side air-fuel ratio for more than a predetermined time during feedback control of air-fuel ratio by the output of upstream air-fuel ratio sensor.

REFERENCES:
patent: Re33942 (1992-06-01), Katsuno et al.
patent: 4739614 (1988-04-01), Katsuno et al.
patent: 5088281 (1992-02-01), Izutani et al.
patent: 5119628 (1992-06-01), Uema et al.
John W. Koupal et al, "Detection of Catalyst Failure On-Vehicle Using the Dual Oxygen Sensor Method," Jul. 31, 1991, pp. 135-146. (SAE Technical Paper Series 910561).
William B. Clemens, et al, "Detection of Catalyst Performance Loss Using On-Board Diagnostics," Feb. 26-Mar. 2, 1990, pp. 1-18; International Congress and Exposition--Detroit, Michigan. (SAE Technical Paper Series 900062).

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