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:
Oct. 20, 1992
Filed:
Apr. 16, 1990
Takashi Iwanaga, Kariya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A Diesel fuel injection device has a pressure accumulation piping for accumualting a fuel at a high pressure and an injector for injecting the fuel supplied by the pressure accumulating piping. The injector including a nozzle needle operative to open and close an injection orifice and a three-way solenoid valve operative to control the fuel pressure acting on the nozzle needle. The three-way solenoid valve is controlled to actuate the nozzle needle and to cause the fuel in the pressure accumulation piping to be injected through the injection orifice. A control valve is provided to control the injection rate characteristic to provide a boot-type injection characteristic. A boot type invention characteristic that is defined by a first characteristic in which the injection rate is substantially constant for a predetermined time period, a subsequent second characteristic in which the injection rate is gradually increased from the first characteristic, and a subsequent third characteristic in which the injection rate is suddenly decreased from the second characteristic; whereby operation noise is be reduced.