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

1992-12-09

1994-01-18

Kamen, Noah P.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, F02F 326, F02B 1900

Patent

active

052791157

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 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 .DELTA.T.sub.R. The deterioration of the catalyst is detected based on the difference .DELTA.(A/F) between (A/F).sub.R and (A/F)'.sub.R.

REFERENCES:
patent: 4739614 (1988-04-01), Katsuno et al.
SAE Technical Paper Series 910561, pp. 135-146, Detection of Catalyst Failure On-Vehicle Using the Dual Oxygen Sensor Method.
SAE Technical Paper Serial 900062, pp. 1-18, Detection of Catalyst Performance Loss Using On-Board Diagnostics.

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