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Low-pressure regulating system of a fuel delivery device of a fuel injection system and a discharge valve therefor

A fuel injection system and fuel delivery technology, applied in the field of relief valve, can solve problems such as high cost and large structure space, and achieve the effect of reducing the risk of cavitation and reducing the variety of variants

Inactive Publication Date: 2019-11-26
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, however, this means that a certain filter size is required, which requires a correspondingly large installation space and thus entails correspondingly high costs.
Furthermore, the total leakage through the fuel filter means that a rapid loading of the fuel filter with dirty particles takes place, whereby frequent replacement of the fuel filter is necessary

Method used

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  • Low-pressure regulating system of a fuel delivery device of a fuel injection system and a discharge valve therefor
  • Low-pressure regulating system of a fuel delivery device of a fuel injection system and a discharge valve therefor
  • Low-pressure regulating system of a fuel delivery device of a fuel injection system and a discharge valve therefor

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Embodiment Construction

[0026] exist figure 1 The fuel delivery device for a fuel injection system of an internal combustion engine shown in FIG. 1 shows a low-pressure circuit 10 with a low-pressure regulating system. The low-pressure circuit 10 comprises a suction line 11 , a delivery line 12 , a delivery pump 13 and at least one fuel filter 14 . Assigned to the low-pressure regulating circuit is a controllable adjusting element 15 , for example designed as a metering unit, an overflow valve 20 and a hydraulically actuatable discharge valve 30 , wherein the discharge valve 30 is actuated via a hydraulic control line 33 . In this case, a fuel filter 14 is arranged in the delivery line 12 between the delivery pump 13 and the controllable adjusting element 15 .

[0027] The delivery pump 13 operates as a pre-delivery pump and draws fuel from the fuel tank 17 and delivers the fuel via the delivery line 12 through the fuel filter 14 to the input side of the high-pressure pump 18 . A high-pressure line...

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Abstract

The invention relates to a low-pressure automatic control system for a fuel-delivery device of a fuel-injection system. The low-pressure automatic control system is designed with: a delivery line (12) which forms a supply from a delivery pump (13) to a high-pressure pump (18); at least one fuel filter (14) arranged in the delivery line (12); and a controllable control element (15), also arranged in the delivery line (12), which element transfers a pre-selectable delivery flow to the high-pressure pump (18), an excess delivery amount that has been conveyed by the delivery pump (13) being carried away into a return flow line (22) by means of an overflow valve (20). A hydraulically controllable cut-off valve (30) is provided in addition to the controllable control element (15), said valve carrying away at least one portion of the excess delivery amount from the fuel line (12), upstream of the fuel filter (14) in the flow direction of the fuel.

Description

technical field [0001] The invention relates to a low-pressure regulating system of a fuel delivery system of a fuel injection system and a discharge valve therefor. Background technique [0002] Known fuel delivery devices have a low-pressure circuit with a delivery pump which draws fuel from the fuel tank and supplies it to the intake side via a delivery line of the high-pressure pump. At least one high-pressure side outlet of the high-pressure pump leads into the high-pressure circuit and via a high-pressure line into a high-pressure accumulator (also referred to as a common rail). The high-pressure accumulator is connected to at least one fuel injector via which fuel is injected into a combustion chamber of the internal combustion engine. In the low-pressure circuit, at least one fuel filter for filtering solid particles from the fuel is arranged between the delivery pump and the high-pressure pump. An adjusting element is connected upstream of the inlet side of the hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M37/00F02D41/38
CPCF02D41/3854F02M37/0029F02M37/0041F02M37/0052F02M59/34
Inventor C·朗根巴赫
Owner ROBERT BOSCH GMBH
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