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:
Dec. 30, 2003
Filed:
Feb. 10, 2003
Akira Kato, Nagoya, JP;
Tatsumasa Sugiyama, Anjyo, JP;
Denso Corporation, Aichi-pref., JP;
Abstract
A pump control valve contained in a high-pressure fuel pump is closed when an engine is stopped, so that the pressure of a common rail is prevented from becoming too high when the engine speed NE is not less than a predetermined value &agr;. The pump control valve is opened when the engine speed NE is decreased to a predetermined value &agr;. Consequently, a predetermined amount of fuel is stored in the pump because the high-pressure fuel pump sucks fuel but does not deliver the fuel to the common rail. Therefore, a lack of fuel being delivered at early stage of startup is prevented because the fuel stored in the pump can be delivered to the common rail in a subsequent startup of the engine. Thus, the pressure of fuel necessary to start the engine can be obtained in a short time, and the time for startup can be decreased.