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:
Aug. 31, 2004
Filed:
Feb. 28, 2002
Hitachi, Ltd., Tokyo, JP;
Abstract
A control method of an engine including at least an HC adsorbing catalyst for adsorbing HC at a low temperature, and emitting adsorbed HC at a high temperature, and a three-way purifying function on the same carrier, and an NO adsorbing catalyst having an NO adsorbing function for adsorbing or occluding NO in oxidizing atmosphere, and emitting NO in reducing atmosphere, and a three-way purifying function. The engine operated with stoichiometric value or a rich air-fuel when a temperature of the HC adsorbing catalyst and/or a temperature of the NO adsorbing catalyst is equal to/lower than a predetermined value. The engine is operated with a lean air-fuel ratio when a temperature of the HC adsorbing catalyst and/or a temperature of the NO adsorbing catalyst is equal to/higher than the predetermined value.