Exhaust system for internal combustion engine

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

1992-06-29

1993-07-20

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 123691, 123692, F01N 320

Patent

active

052282872

ABSTRACT:
An exhaust system for an automobile engine having two groups of cylinders has a catalytic device. Deterioration of the catalytic device is detected based on an oxygen level in exhaust gas passed through the catalytic device. A feedback control of an air-fuel ratio is conducted for the cylinder groups all together, based on either of the air-fuel ratios determined, based on emission levels of exhaust gas discharged, for one of two of the groups of cylinders, only when a specific vehicle driving condition is detected.

REFERENCES:
patent: 5074113 (1991-12-01), Matsuoka

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