External catalytic converter for small internal combustion engin

Details External catalytic converter for small internal combustion engin External catalytic converter for small internal combustion engin

1993-03-05

1994-08-23

Kamen, Noah P.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60302, F01N 310

Patent

active

053396294

ABSTRACT:
A catalytic converter is mounted at the exhaust gas outlet of a muffler for a two or four-cycle internal combustion engine of the type having one or two cylinders such as those used for lawn and garden equipment. The catalytic converter is located exteriorly of the muffler body in the path of the exhaust gases for oxidizing and/or reducing exhaust gas components subsequent to their discharge from the muffler. Secondary air supply is provided upstream of the catalyst within the converter by mounting the catalytic converter to provide a gap between the converter and the muffler body. Alternately, secondary air is provided by at least one opening formed in the converter upstream of the catalyst which communicates between the interior of the converter and atmosphere. A reed valve may be associated with each opening which is operable in response to exhaust gas pressure pulsations between a normally closed position and an open position to permit atmospheric air to flow into the interior of the converter upstream of the catalyst.

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