Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1976-01-07
1977-05-24
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60299, F02B 7510, F01N 315
Patent
active
040247066
ABSTRACT:
A method is disclosed for widening the range of air-fuel ratios over which three-way catalysts having an oxygen storage capacity are operative. Three-way catalysts are operative when new both in oxidizing at least 80% of the unburned hydrocarbons and carbon monoxide and in reducing 80% of the oxides of nitrogen contained in an exhaust gas stream delivered to the catalysts from an engine. In general, the method is conducted by supplying to the engine to be burned therein an air-fuel mixture in which the fuel to air ratio is varied from a rich condition in which more fuel is present than air to burn it to a lean condition in which less fuel is present than air to burn it. The air-fuel ratio is displaced equal amounts to the rich and to the lean sides from a stoichiometric condition. The displacement to each side is generally of an identical nature and the overall frequency of displacement is such that the oxygen storage capacity of the particular three-way catalyst is not exhausted during the lean portion of the cycle.
REFERENCES:
patent: 3287899 (1966-11-01), Bintz
patent: 3782347 (1974-01-01), Schmidt
patent: 3809743 (1974-05-01), Unland
patent: 3861366 (1975-01-01), Masaki
Adawi Marwan K.
Briggs Allan D.
DeLosh Robert G.
Smith Carol S.
Ford Motor Company
Hart Douglas
Johnson William E.
Zerschling Keith L.
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