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:
May. 27, 2008
Filed:
Aug. 15, 2003
Yoshihiro Sukegawa, Hitachi, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Junichi Yamaguchi, Tokai, JP;
Hiroshi Fujii, Tokyo, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Junichi Yamaguchi, Tokai, JP;
Hiroshi Fujii, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In warming up operation when the temperature of an engine is low, heat release in a combustion chamber is delayed by making ignition timing immediately before the top dead center of compression stroke or later. Hereby, exhaust gas including a large quantity of unburned HC, oxygen and carbon monoxide is exhausted into an exhaust passage. Then, the mixture of the HC, oxygen and carbon monoxide is accelerated by a turbulence generating means for generating turbulence in an exhaust flow mounted in the exhaust passage. Hereby, the HC is combusted in the exhaust passage, exhaust temperature is raised, resulting in that effective reduction of the HC. As the exhaust temperature is raised, it can activate earlier a catalytic converter for purifying exhaust.