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:
Jul. 23, 1996
Filed:
Dec. 02, 1994
Kazuo Yamamoto, Nagoya, JP;
Nippondenso Co., Ltd., , JP;
Abstract
A high pressure fuel injection system for an internal combustion engine includes a fuel feed pump which pressurizes fuel to a given feed pressure during the engine being operated, while immediately stops pressurizing the fuel when the engine is stopped. The system further includes a high pressure supply pump connected in series to the fuel feed pump for further pressurizing the fuel supplied from the fuel feed pump to a higher pressure. The system further includes a high pressure fuel reservoir which receives the high pressure fuel from the high pressure supply pump and supplies it to fuel injection valves for injection therefrom. A pressure relief valve is connected to the high pressure fuel reservoir at its one side and to the fuel feed pump at its other side. The pressure relief valve is arranged to be held closed when the given feed pressure is applied thereto from the fuel feed pump, that is, when the engine is operated. On the other hand, the pressure relief valve is arranged to be immediately opened to release the pressure in the high pressure fuel reservoir in response to absence of the given feed pressure from the fuel feed pump, that is, when the engine is stopped. With this arrangement, leakage of the high pressure fuel via the fuel injection valves is effectively prevented.