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:
Apr. 16, 1985
Filed:
Sep. 14, 1982
Hermann Eisele, Vaihingen-Enz, DE;
Volkhard Stein, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A fuel injection pump is proposed, based on a fuel injection pump of a known type, which has an adjusting member for determining the injection duration and is provided with a throttle device for determining the effective supply stroke of the pump piston. In accordance with the invention it is proposed that the position of the throttle device be varied by means of a pressure control device, which is controllable by signals of an rpm-dependent electronic control unit. The position of the adjusting member determining the duration of injection remains as constant as possible, while the throttle device adjusts the flowthrough cross section of a connecting line leading from the pump work chamber to a fuel withdrawal chamber in accordance with rpm. Thus it is possible, in particular given the small injection quantities required during idling, to effect a uniformly small injection quantity per unit of time during a relatively long injection duration; this results in a substantial reduction in noise.