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Low-pressure circuit of the fuel supply device of the fuel injection system

A technology of fuel supply device and fuel injection system, which is applied in the direction of fuel injection device, fuel injection pump, charging system, etc., and can solve problems such as the complex structure of high-pressure pumps

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

AI Technical Summary

Problems solved by technology

In this type of fuel supply, the metering unit and the overflow valve are flanged on the high-pressure pump or integrated in a housing section of the high-pressure pump, whereby the high-pressure pump has a complex construction

Method used

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  • Low-pressure circuit of the fuel supply device of the fuel injection system
  • Low-pressure circuit of the fuel supply device of the fuel injection system
  • Low-pressure circuit of the fuel supply device of the fuel injection system

Examples

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Embodiment Construction

[0020] figure 1 and 2 The illustrated fuel supply system for a fuel injection system of an internal combustion engine has a low-pressure circuit 10 with a low-pressure line 11 and a high-pressure circuit 20 with a high-pressure line 21 . The low-pressure line 11 leads from the oil sump 19 to the high-pressure pump 15 through the feed pump 14 and the fuel filter 13 . A high-pressure line 21 leads from the high-pressure pump 15 to a fuel accumulator 22 , also called a fuel rail. The fuel accumulator 22 is optionally connected to a pressure regulating valve 23 which regulates the pressure in the fuel accumulator 22 to the required injection pressure. For example, a plurality of fuel injectors 24 are connected to the fuel accumulator 22 . Fuel is injected under high pressure into a combustion chamber (not shown) of the internal combustion engine by means of the fuel injectors 24 . Return line 17 returns from pressure regulator valve 23 and from fuel injector 24 to sump 19 .

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Abstract

A low-pressure circuit of a fuel supply device of a fuel injection system of an internal combustion engine is proposed. The low-pressure circuit (10) has a low-pressure line (11), which forms an input from the supply pump (13) to the high-pressure pump (15), wherein a controllable regulating element (16) delivers a pre-pressure to the high-pressure pump (15). The selected supply flow, and the excess fuel supplied from the supply pump (13) is directed into the return line (17) by means of an overflow valve (30). A T-piece (40) is arranged in the low-pressure line (11), in which the overflow valve (30) is accommodated.

Description

technical field [0001] The invention relates to a low-pressure circuit of a fuel supply of a fuel injection system of an internal combustion engine according to the inventive subject matter of claim 1 . Background technique [0002] A fuel supply system for a fuel injection system of an internal combustion engine supplies fuel from a sump of a high-pressure accumulator, also called a fuel rail. The high-pressure accumulator is hydraulically connected to at least one fuel injector via which fuel is injected into a combustion chamber of the internal combustion engine. [0003] Such a fuel supply is known, for example, from DE 10 2011 077 794 A1. A feed pump is provided here, which sucks up fuel from the sump and feeds the suction side in a low-pressure circuit via the low-pressure line of the high-pressure pump. At least one high-pressure-side outlet of the high-pressure pump leads into a high-pressure circuit and via a high-pressure line to the high-pressure accumulator, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M37/04F02M55/00
CPCF02M37/0029F02M37/0052F02M59/34
Inventor J·阿莱克尔
Owner ROBERT BOSCH GMBH
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