Method for detecting deterioration of catalyst and measuring con

Details Method for detecting deterioration of catalyst and measuring con Method for detecting deterioration of catalyst and measuring con

1993-01-06

1994-10-25

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 320

Patent

active

053577507

ABSTRACT:
The invention provides a method for accurately and precisely detecting deterioration of a catalyst and measuring a conversion efficiency of a catalyst for HC/CO/NOx by using an oxygen sensor and an air/fuel ratio sensor disposed on the upstream and downstream sides of the catalyst, respectively. The catalyst is determined to be deteriorating when an output amplitude of the air/fuel ratio sensor becomes greater than a predetermined value. The conversion efficiency of the catalyst is determined based on a predetermined relationship between the output amplitude and the mean converted rate of HC/CO/NOx.

REFERENCES:
patent: 3969932 (1976-07-01), Rieger
patent: 4622809 (1986-11-01), Abthoff
patent: 4884066 (1989-11-01), Miyata

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