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Fuel pump arrangements

A fuel pump and fuel technology, applied in fuel injection devices, fuel injection pumps, fuel injection control, etc., can solve problems such as low ratio, increased noise, vibration and wear, and decreased operating efficiency

Active Publication Date: 2015-07-08
DELPHI TECH IP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When lower rail pressures are desired, the operating efficiency of the pump 10 is reduced because the ratio of the volume of high pressure fuel reaching the fuel rail 20 to the volume of high pressure fuel returning to the low pressure source 24 is low when the metering valve 26 is open
Noise, vibration and wear associated with operation of the pump 10 also increase

Method used

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  • Fuel pump arrangements
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Examples

Experimental program
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Embodiment Construction

[0037] figure 2 A part of a fuel injection system 100 with a fuel pump arrangement according to a first embodiment of the invention is shown. The fuel pump device includes a plurality of fuel pumps of a unit pump type. In the illustrated embodiment, first and second fuel pump units 110a, 110b are provided.

[0038] Each fuel pump unit 110a, 110b, hereinafter referred to as a fuel pump, includes a pumping chamber 112a, 112b, and is arranged to reciprocate in a plunger bore (not shown) to increase and decrease the respective pumping chamber 112a, 112b volumetric pumping elements or plungers 114a, 114b. The pumping plungers 114a, 114b are driven by respective first and second cams 116a, 116b mounted on a common camshaft 118 .

[0039] The first cam 116a and the second cam 116b have different cam profiles. Specifically, the first cam 116a has a greater lift than the second cam 116b, the lift of each cam 116a, 116b being the difference between the smallest radius of the cam pr...

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PUM

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Abstract

A fuel pump arrangement for a fuel injection system is described. The fuel pump arrangement comprises one or more cam-driven pump units (110a, 110b), and the or each pump unit (110a, 110b) comprises a pumping chamber (112a, 112b) and a pumping element (114a, 114b) for pressurising fuel in the pumping chamber (112a, 112b). The or each pumping element (114a, 114b) is driven by a respective cam (116a, 116b) of the fuel pump arrangement to undergo at least one pumping stroke per revolution of the cam (116a, 116b). The fuel pump arrangement is configured such that the fuel volume displaced in a first pumping stroke is greater than the fuel volume displaced in a second pumping stroke. In this way, the efficiency of operation of the fuel pump arrangement can be improved.

Description

technical field [0001] The invention relates to a pump device suitable for pumping fuel. In particular, but not exclusively, the invention relates to a fuel pump arrangement for a high pressure fuel injection system of an internal combustion engine. Background technique [0002] In high pressure fuel injection systems it is known to use one or more cam driven pump units to boost the fuel delivered to the fuel injectors. Usually, several pump units are provided in order to distribute the pumping work among the several units. Each pump unit comprises a pumping chamber, and a pumping plunger driven to reciprocate inside the pumping chamber by an associated cam. The function of the pumping plunger is to draw fuel from a low pressure fuel source into the pumping chamber during the fill or return stroke of the plunger and to pressurize the fuel in the pumping chamber for delivery to the pumping chamber during the pumping or advance stroke of the plunger. fuel injector. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M63/02F02M59/10F02M59/36F02D41/38F04B9/04F02M59/06
CPCF02M63/027F02M59/102F02M59/06F02D41/3845F04B9/042F02M59/366F02M63/0265
Inventor E.威廉斯
Owner DELPHI TECH IP LTD