The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 10, 2002
Filed:
Apr. 08, 1999
Fuminori Yamanashi, Tokyo, JP;
Kimiyoshi Nishizawa, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
Plural hydrocarbon HC adsorbing units (A -A ) and plural three-way catalysts (B -B ) are accommodated in a shell ( ). The HC adsorbing units (A -A ) and three-way catalysts (B -B ) are disposed alternately in series, and one of the HC adsorbing units (A -A ) is disposed in the position nearest to an inlet ( ) of the shell ( ). The HC contained in exhaust gas when the engine is started cold is first adsorbed by the HC adsorbing units (A -A ), and the HC desorbed from the HC adsorbing units (A -A ) with temperature rise is oxidized by the adjacent three-way catalysts (B -B ) situated downstream. The heat capacities of the HC adsorbing units (A -A ) and the three-way catalysts (B -B ) are set so that the timing at which HC starts to be desorbed from the HC adsorbing units (A -A ) is later than the timing at which HC starts to be oxidized by the three-way catalysts (B -B ) situated downstream. In this way, HC which are discharged from the engine during a cold start are efficiently purified.