Exhaust gas purifying device of an engine

Details Exhaust gas purifying device of an engine Exhaust gas purifying device of an engine

1993-01-19

1993-12-21

Miller, Carl S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 123691, F01N 320

Patent

active

052712230

ABSTRACT:
An exhaust gas purifying device including a first O.sub.2 sensor, a first three-way catalyst, a secondary air feed port, a second O.sub.2 sensor, and a second three-way catalyst, which are arranged in the exhaust passage in that order. When not increasing the fuel supplied, the feeding of secondary air is stopped and feedback control is performed based on the output signals of the first O.sub.2 sensor and the second O.sub.2 Sensor so that the air-fuel ratio of the mixture fed to the engine cylinders becomes the stoichiometric air-fuel ratio. When increasing the fuel supplied, the feedback control of the air-fuel ratio is stopped, secondary air is fed from the secondary air feed port, and the amount of secondary air is controlled so that the air-fuel ratio of the gas flowing into the second three-way catalyst becomes the stoichiometric air-fuel ratio.

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