Engine exhaust purification system

Details Engine exhaust purification system Engine exhaust purification system

1993-03-16

1994-08-16

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 123688, 123691, F01N 328

Patent

active

053375580

ABSTRACT:
An engine exhaust purification system is provided with a catalyst in an exhaust line, and oxygen sensors disposed in the exhaust line upstream and downstream from the catalyst, respectively. Deterioration of the catalyst is judged based on a frequency ratio of reversal of an output from the downstream oxygen sensor with respect to a threshold value to an output from the upstream oxygen sensor with respect to a threshold value. The threshold value of the deteriorated oxygen sensor is changed so as to vary the frequency ratio of reversal.

REFERENCES:
patent: 5099647 (1992-03-01), Hamburg

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