Device for detecting the degree of deterioration of a catalyst

Details Device for detecting the degree of deterioration of a catalyst Device for detecting the degree of deterioration of a catalyst

1992-11-10

1995-05-16

Kamen, Noah P.

Power plants

Internal combustion engine with treatment or handling of...

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

F01N 300

Patent

active

054149967

ABSTRACT:
A catalyst deterioration detecting device comprising a first air-fuel ratio sensor and a second air-fuel ratio sensor which are arranged in the exhaust passage upstream and downstream of the catalyst, respectively. When the air-fuel ratio of the mixture fed into the engine is changed over from the lean air-fuel ratio (A/F).sub.L to the rich air-fuel ratio (a/F).sub.R, the air-fuel ratio detected by the second air-fuel ratio sensor is changed to the rich air-fuel ratio (A/F).sub.R after it is maintained at the stoichiometric air-fuel ratio for a time AT.sub.R. The deterioration of the catalyst is detected based on the time T.sub.R, the amount of air and the difference between the rich air-fuel ratio (A/F).sub.R and the stoichiometric air-fuel ratio.

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patent: 5099647 (1992-03-01), Hamberg
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patent: 5191762 (1993-03-01), Kuroda et al.
Detection of Catalyst Failure On-Vehicle Using The Dual Oxygen Sensor Method John W. Koupal, Michael A. Sabourin, and William B. Clemmens, U.S. Environmental Protection Agency, pp. 135-145.
SAE International, SAE Technical Paper Series-Detection of Catalyst Performance Loss Using On-Board Diagnostics, William B. Clemmens, Michael A. Sabourin and Thomas Rao, pp. 1-18.

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