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:
Apr. 19, 2005
Filed:
Apr. 01, 2003
Yoko Nakayama, Oyamazakicho, JP;
Toshiharu Nogi, Hitachinaka, JP;
Takuya Shiraishi, Hitachinaka, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Yoko Nakayama, Oyamazakicho, JP;
Toshiharu Nogi, Hitachinaka, JP;
Takuya Shiraishi, Hitachinaka, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
With a cylinder direct injection engine in which fuel is injected directly into combustion chambers and air-fuel mixture is guided by an air flow, it is difficult to secure combustion stability under low engine speed and low load conditions such as during idling. Furthermore, there are needs for improvement of emission characteristics and fuel economy in other operation modes as well. An engine according to the invention injects fuel while dividing the same in plural parts during a compression stroke. The first injection forms a lean air-fuel mixture around an ignition plug, and the second injection makes a flammable air-fuel mixture reach an area around the ignition plug. This ensures efficient stratified combustion and allows improvement in emission and fuel economy performance.