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. 31, 2005
Filed:
Sep. 10, 2002
Ilija Djordjevic, East Granby, CT (US);
Ilija Djordjevic, East Granby, CT (US);
Stanadyne Corporation, Windsor, CT (US);
Abstract
The invention is directed to the combination of fuel rail pressure control at lower speed using high pressure regulation plus fuel rail pressure control at higher speed using any of a variety of forms of inlet metering. The partial filing control at high speed can in one embodiment include pre-metering the quantity of feed fuel delivered to each pumping chamber, for example by modulating the feed pressure at the pumping chamber inlet. Another embodiment includes passing the feed fuel from the inlet passage through a fixed, calibrated orifice sized to pass sufficient feed fuel to fill the pumping chambers in the charging phase during operation of the engine in the low speed range, while in the high speed range the flow resistance of the orifice prevents the pumping chamber from filling in the charging phase, thereby monotonically decreasing the quantity of high pressure fuel delivered to the discharge passage in the discharge phase per engine revolution, with increasing speed above the transition speed.