Method and apparatus for reducing cold-phase emissions by utiliz

Details Method and apparatus for reducing cold-phase emissions by utiliz Method and apparatus for reducing cold-phase emissions by utiliz

1996-02-07

1997-06-10

Kamen, Noah

Internal-combustion engines

Charge forming device

Auxiliary air or oxygen added to combustible mixture

F02B 2300

Patent

active

056366191

ABSTRACT:
An oxygen-enriched air intake control system for an internal combustion engine includes air directing apparatus to control the air flow into the intake of the engine. During normal operation of the engine, ambient air flowing from an air filter of the engine flows through the air directing apparatus into the intake of the engine. In order to decrease the amount of carbon monoxide (CO) and hydrocarbon (HC) emissions that tend to be produced by the engine during a short period of time after the engine is started, the air directing apparatus diverts for a short period of time following the start up of the engine at least a portion of the ambient air from the air filter through a secondary path. The secondary path includes a selectively permeable membrane through which the diverted portion of the ambient air flows. The selectively permeable membrane separates nitrogen and oxygen from the diverted air so that oxygen enriched air containing from about 23% to 25% oxygen by volume is supplied to the intake of the engine.

REFERENCES:
patent: 5051113 (1991-09-01), Nemser
patent: 5051114 (1991-09-01), Nemser et al.
patent: 5400746 (1995-03-01), Susa et al.

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