Method of operating a three-way catalyst for internal combustion

Details Method of operating a three-way catalyst for internal combustion Method of operating a three-way catalyst for internal combustion

1977-12-22

1980-04-29

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60289, 60290, 60299, F01N 315

Patent

active

041999380

ABSTRACT:
A method of operating a three-way catalyst which contains an oxygen storage material and which is mounted on the exhaust system of an internal combustion engine is disclosed. In order to operate the three-way catalyst effectively, the air-fuel ratio of the mixture supplied to the engine is set to be richer than the stoichiometric ratio, and secondary air is intermittently supplied by an air pump into the exhaust system upstream of the three-way catalyst, thereby to alternately vary the air-fuel ratio of the exhaust gases supplied to the three-way catalyst to become rich and lean with respect to the stoichiometric ratio.

REFERENCES:
patent: 3768259 (1973-10-01), Carnahan
patent: 3885019 (1975-05-01), Matsushita
patent: 3962867 (1976-06-01), Ikeura
patent: 4024706 (1977-05-01), Adawi

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