Exhaust system for internal combustion engine

Details Exhaust system for internal combustion engine Exhaust system for internal combustion engine

1992-07-23

1993-08-10

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 123691, 123692, F01N 328

Patent

active

052338290

ABSTRACT:
In an exhaust system for an internal combustion engine, including an upstream catalytic converter and a downstream catalytic converter, emission levels of exhaust gas are detected at positions upstream from the upstream catalytic converter, between the upstream and downstream catalytic converters, and downstream from the downstream catalytic converter, respectively. An air-fuel ratio is feedback controlled based on an emission level detected by the first emission sensor or feedback controlled based on an emission level detected by the second emission sensor when the engine operates in a specific vehicle operating condition. Deterioration of the downstream catalytic converter is detected based on an emission level detected by the third emission sensor while an air-fuel ratio is feedback controlled based on the emission level detected by the second emission sensor.

REFERENCES:
patent: 4622809 (1986-11-01), Abthoff
patent: 5074113 (1991-12-01), Matsuoka

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