Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1991-05-28
1993-06-22
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123496, F02M 4100
Patent
active
052208940
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a fuel injection pump for internal combustion engines as generically defined hereinafter. In such a fuel injection pump, known from German Patent 30 13 368, an in-line injection pump is provided with an electronic governor to which the intended load is input via a gas pedal. At each cylinder of the injection pump, a throttle controlling the intake bore to this cylinder is adjusted by this gas pedal. This throttle is intended to assure maintenance of engine operation if the governor fails and to reliably avoid exceeding a maximum rpm. This apparatus has the disadvantage that the throttle on the input side causes a filling loss of the pump work chambers, which for normal operation must be compensated for again by the governor. This necessitates greater expense in terms of construction, because the fuel injection pump must be designed for an intrinsically higher capacity than what it actually puts out.
ADVANTAGES OF THE INVENTION
The fuel injection pump according to the invention has the advantage over the prior art that the function of fuel injection quantity governing, when the governor is intact, is in no way interfered with, yet on the other hand if the governor has failed, the adjustable throttle, with the minimum constant flow cross section that continues to be provided, enables idling and operation under load for emergency operation. Advantageous further features of the provisions disclosed herein are recited in the dependent claims. Particularly advantageously, control of the throttle device of the throttle is achieved so that an rpm-dependent and load-dependent mechanical control of the fuel injection pump can be performed if the governor has failed.
DRAWINGS
Four exemplary embodiments, with three variants of one exemplary embodiment, are shown in the drawings and described in further detail in the ensuing description. Shown are in FIG. 1 illustrate a first exemplary embodiment of a fixed throttle located in a bypass around a throttle in the fuel supply line; FIG. 2 illustrate a variant of the exemplary embodiment of FIG. 1 having a seat valve as the throttle; FIG. 3 illustrate a second variant of the exemplary embodiment of FIG. 1, in a further development of FIG. 2, having a flow cross section forming the fixed throttle, in the valve closing element of the feed valve; FIGS. 4a and 4b illustrate a third variant of the exemplary embodiment of FIG. 1, with a fixed throttle integrated with a rotary slide, seen in three functional positions; FIG. 5 illustrate the second exemplary embodiment of the invention, having a throttle adjustable as a function of rpm; FIG. 6 illustrate a third exemplary embodiment, having a throttle body provided with an oblique control edge; and FIG. 7 illustrate a fourth exemplary embodiment as a modification of that shown in FIG. 6, having a pressure-equalizing annular groove.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
In the exemplary embodiment shown in FIG. 1, a cylinder bore 2, in which a pump piston 3 encloses a pump work chamber 4, is provided in a pump housing 1 of a fuel injection pump. The pump piston is rotatingly driven by means not further shown, via a cam disk 5 that runs on a roller race 6 (shown folded over by 90 into the plane of the drawing), and in its rotational motion executes a reciprocating pump motion with an intake stroke and a supply stroke. The supply of fuel to the pump work chamber is effected via a fuel supply line 8, which leads from a fuel supply chamber 9 serving as a fuel supply source to the cylinder 2; the fuel entry into the cylinder is controlled via longitudinal grooves 10 beginning at the end face of the pump piston. The fuel supply chamber is located inside the pump housing and is supplied with fuel by means of a fuel feed pump 12, which typically is driven synchronuously with the pump piston. To this end, the fuel feed pump communicates with a fuel supply tank 15 via an intake line 14. Connected parallel to the fuel feed pump is a pressure control valve 16 by means of which,
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patent: 3405700 (1968-10-01), Hoefer
patent: 4407249 (1983-10-01), Eheim
patent: 4409939 (1983-10-01), Eheim
patent: 4449504 (1984-05-01), Furuhashi
patent: 4463726 (1984-08-01), Roca-Nierga
patent: 4604979 (1986-08-01), Kobayashi
patent: 4974564 (1990-12-01), Laufer
Greigg Edwin E.
Greigg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
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