Engine exhaust system for reduction of hydrocarbon emissions

Details Engine exhaust system for reduction of hydrocarbon emissions Engine exhaust system for reduction of hydrocarbon emissions

1991-07-22

1993-05-04

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Material from exhaust structure fed to engine intake

55159, 55389, 123519, 123520, F02M 3302

Patent

active

052077349

ABSTRACT:
An engine exhaust system disclosed which is designed to reduce hydrocarbon emissions caused by the evaporation of fuel from the fuel tank and by the inefficiency of combustion and catalytic conversion during cold engine start-up. This system utilizes molecular sieves, such as high-silica zeolites, which adsorb hydrocarbons evaporating from the fuel tank or emitted during engine start-up, before the catalytic converter has attained an effective operating temperature. This system is designed so that hydrocarbons that would otherwise be emitted to the atmosphere from the fuel tank or by passing through the converter unconverted are held within the system either for combustion in the engine or passage through the converter once it is operating efficiently.

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