Method and apparatus for determining deterioration of three-way

Details Method and apparatus for determining deterioration of three-way Method and apparatus for determining deterioration of three-way

1992-04-22

1994-02-01

Raevis, Robert

Measuring and testing

Simulating operating condition

Marine

G01M 1900

Patent

active

052823830

ABSTRACT:
In a double air-fuel ratio sensor system including two air-fuel ratio sensors disposed on the upstream and the downstream of the catalyst which is installed in the exhaust passage of the engine and has oxygen storage effect, an air-fuel ratio correction amount is calculated in accordance with the output of the upstream O.sub.2 sensor, and the actual air-fuel ratio is adjusted in accordance with the calculated air-fuel ratio correction amount. Further, the determination of the deterioration of the catalyst is carried out in accordance with the output of the second O.sub.2 sensor when the air-fuel ratio of the engine is adjusted.

REFERENCES:
patent: 4622809 (1986-11-01), Abthoff et al.
patent: 4691562 (1987-09-01), Abthoff et al.
patent: 5119628 (1992-06-01), Uema et al.

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