Patent ID: 7341699

Claim:
An emission abatement device comprising: a housing, a tube positioned in the housing to define an outer passageway between the housing and the tube and that defines an inner passageway, a hydrocarbon trap positioned in the outer passageway, a 3-way catalyst in the housing positioned downstream from the hydrocarbon trap, a valve movable between (i) a closed position to block passage of exhaust gas through the inner passageway to force the exhaust gas into the outer passageway to pass through the hydrocarbon trap to the 3-way catalyst and (ii) an opened position to allow passage of exhaust gas to the 3-way catalyst through the outer passageway and the hydrocarbon trap and through the inner passageway, and wherein, the 3-way catalyst is spaced along an axis of the housing apart from the hydrocarbon trap and the tube, to define a chamber that is located in the housing between the 3-way catalyst and both the hydrocarbon trap and the tube, and that connects the outer and inner passageways with the 3-way catalyst to conduct exhaust gas from the outer and inner passageways through the chamber to the 3-way catalyst, and wherein, the hydrocarbon trap is spaced apart from the tube to define a gap therebetween.