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Reverse flow check valve for common rail fuel system

A common rail fuel system and common rail fuel technology, applied in the direction of charging system, fuel injection pump, fuel injection device, etc.

Inactive Publication Date: 2013-02-13
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the Ganser high pressure fluid volume is on the injector side of the wave mechanics and suppression check valves

Method used

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  • Reverse flow check valve for common rail fuel system
  • Reverse flow check valve for common rail fuel system
  • Reverse flow check valve for common rail fuel system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Now refer to figure 1 , common rail fuel system 10 includes a high pressure pump 20 having an outlet 22 fluidly connected to a common rail 30 . figure 1 The fuel system shown is connected to a sixteen-cylinder compression-ignition engine having a V-shaped configuration, thereby forming two sets of eight common rail fuel injectors. Those skilled in the art will appreciate that the concepts disclosed herein are applicable to both V-shaped and inline engines having any number of cylinders. The high pressure pump 20 includes eight separate pumping elements such that the outlet 22 actually includes a plurality of outlets 24 fluidly connected to an output rail (manifold) 26 . The common rail 30 includes a first injection rail 34 and a second injection rail 35 which are fluidly connected to the output rail 26 via a first distribution passage 90 and a second distribution passage 91 , respectively. Each of the plurality of common rail fuel injectors 40 is fluidly connected wit...

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PUM

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Abstract

A common rail fuel system (10,110) includes a reverse flow check valve (60,160) fluidly positioned between each of a plurality of common rail fuel injectors (40) and an outlet (22,154) of a high pressure pump (20). The reverse flow check valves (60,160) divide the overall system fluid volume (80) into an upstream common volume (82) and a plurality of separate downstream volumes (83). The upstream common volume (82) is greater than the sum of the separate downstream volumes (83). The reverse flow check valve (60,160) is movable between a first configuration with a large flow area (68,168) and a second configuration with a small flow area (69,169). The reverse flow check valve (60,160) associated with each of the individual fuel injectors may be housed in a quill (50) that fluidly connects the fuel injectors to the high pressure common rail (30,130).

Description

technical field [0001] The present invention relates generally to a common rail fuel system, and more particularly to a reverse flow check valve that suppresses pressure surges that impair control of fuel injection events. Background technique [0002] During an injection event, high pressure fuel flows from the common rail to the nozzle outlets of the individual fuel injectors. When this jetting event is unexpectedly terminated, a hydraulic hammer pressure wave is generated due to the sudden cessation of fluid momentum. Pressure waves propagate from the fuel injectors to the common rail. Not only can pressure waves cause pressure spikes within fuel injectors that accelerate structural fatigue damage, pressure fluctuations can also make it difficult to control the amount and timing of fuel delivered by the same injector in a tightly coupled post-injection. Also, a pressure wave can propagate through the common rail and reach the fuel injector inlet when another fuel inject...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M55/02F02M61/16F02M59/44
CPCF02M63/005F02M55/02
Inventor S·F·沙弗李振宇D·R·伊布拉西姆B·R·陶尔K·C·亚当斯M·D·吉尔斯特纳
Owner CATERPILLAR INC