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. 26, 2009
Filed:
Feb. 24, 2006
Christian Koehler, Erligheim, DE;
Ruediger Schnell, Eberbach, DE;
Timm Hollmann, Ludwigsburg, DE;
Yves Lamirand, Asperg, DE;
Christian Koehler, Erligheim, DE;
Ruediger Schnell, Eberbach, DE;
Timm Hollmann, Ludwigsburg, DE;
Yves Lamirand, Asperg, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
In a method for operating an internal combustion engine () equipped with a piston pump as a high-pressure pump (), which is driven by a drive shaft () of the engine (), in which the high-pressure pump () delivers fuel from a low-pressure region () to a high-pressure side () and a quantity control valve () sets the quantity of fuel delivered by the high-pressure pump (), the acoustic emission of the high-pressure pump is reduced by virtue of the fact that the high-pressure pump () functions in a two-point operation, alternating between full delivery for individual or successive piston strokes and idle delivery for individual or successive piston strokes and, when the pressure falls below a lower pressure threshold, the full delivery is activated until an upper pressure threshold is reached.