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. 23, 1993
Filed:
Jan. 15, 1993
Karl Konrath, Freiberg, DE;
Claus Koester, Ditzingen, DE;
Christin Taudt, Winnenden, DE;
Andre Brunel, Genis Laval, FR;
Pierre Lauvin, Stuttgart, DE;
Francois Quarret, Grezieu la Varenne, FR;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A fuel injection pump for internal combustion engines has an adjusting piston for adjusting an injection instant, is acted upon by a return force and delimits a working space, a control slide delimiting a pressure space in the adjusting piston and displaceable in the adjusting piston counter to a return force by a pressure-source supply pressure in the pressure space and controlled as a function of speed of the engine so that the working space can be connected to a pressure source or to a relief space, and so the supply pressure in the pressure space is additionally controlled as a function of further operating parameters of the engine. A feed pump delivering at a rate proportional to speed has a delivery side connected to the pressure space, a pressure line, containing a restriction, directly connects the delivery side of the feed pump to the pressure space so that the pressure is directly connected with the feed pump exclusively by the pressure line and is not connected with the inlet chamber. A discharge line is arranged for relieving the pressure space downstream of the restriction and having an element arranged in the discharge line for controlling the control pressure and influencing a flow a fuel from a delivery line, a pressure maintaining valve is arranged in the delivery line and enable passage to the inlet chamber only at a certain pressure at the delivery line, and a pressure control valve relieves the inlet chamber.