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. 03, 1988
Filed:
Jul. 03, 1986
Gerald Hofer, Weissach-Flacht, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A fuel injection pump for internal combustion engines is proposed wherein control over the injected fuel quantity is exercised by regulating the outlet (C) of a second relief line (33) of the working space (5) of the fuel injection pump by means of a control edge (25) positionable as a function of load and/or speed in the part-load range, and optionally of the first outlet cross-sectional area (D), displaced along the stroke, of a first relief line (15). In full-load operation, the effective length of the delivery stroke is limited by opening a relief opening (E) carried by the pumping plunger at a control edge (9). To obtain delivery at reduced fuel injection rate, especially at no load or low load, over as long a stroke length (h.sub.L) as possible, fuel-quantity control is effected, first, with respect to the duration of injection, by means of the control edge (25) which controls the outlet (C), and secondly, by opening, at a constant point along the stroke, the relief opening (E). The leakage rate per plunger stroke can be predetermined by means of a throttle (34) located at the outlet (E).