Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1991-04-11
1992-10-27
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 731181, F01N 320
Patent
active
051579219
ABSTRACT:
The invention provides a method for accurately and precisely measuring a converted rate of a catalyst for HC/CO/NOx, NOx, and HC/CO and detecting deterioration using two air/fuel ratio sensors disposed on the upstream and downstream sides of the catalyst. The converted rate of the catalyst is determined based on a predetermined relationship between the mean converted rate and a reduction ratio of output amplitudes of the downstream sensor to the upstream sensor. The catalyst is determined to be deteriorating when the reduction ratio becomes less than a predetermined value.
REFERENCES:
patent: 3969932 (1976-07-01), Rieger
patent: 4622809 (1986-11-01), Abthoff
patent: 4884066 (1989-11-01), Miyata
patent: 5097700 (1992-03-01), Nakane
Hayakawa Nobuhiro
Ito Yasuo
Hart Douglas
NGK Spark Plug Co. Ltd.
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