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:
Nov. 30, 2004
Filed:
Oct. 25, 2002
Peter Schueler, Leonberg, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A fuel system is disclosed in which high-pressure fuel pump with a prefeed pump is proposed, in which the fuel quantity pumped by the prefeed pump is distributed for cooling and lubrication purposes, via a continuously adjustable multiposition valve, to the pump elements of the high-pressure fuel pump or to the low-pressure region of the high-pressure fuel pump. The multiposition valve is controlled by the control unit of the engine. An advantageous feature of the high-pressure fuel pump of the invention is that depending on the operating state of the engine and of the high-pressure fuel pump, an optimal distribution of the fuel quantity pumped by the prefeed pump can always be accomplished. Moreover, the energy demand by the prefeed pump is reduced and its service life is lengthened.