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Electrovalve for draining common rail

A technology of electric valve and valve seat, applied in the direction of valve details, valve device, valve operation/release device, etc., can solve uncontrolled dynamic movement of plunger, loss of magnetic force, pressure control, back leakage pressure peak and related problems such as noise instability

Active Publication Date: 2016-08-17
DELPHI TECH IP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In practice, however, the large fuel gap between the plunger and cap results in uncontrolled dynamic movement of the plunger and loss of magnetic force
Without damping, there are instabilities in the system's pressure control, back leak pressure peaks and associated noise

Method used

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  • Electrovalve for draining common rail
  • Electrovalve for draining common rail
  • Electrovalve for draining common rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] refer to figure 1 , the known embodiment to be improved comprises a valve body 1 with an internal longitudinal hole 2 in which a longitudinal axis 3 can move. The small gap between hole 2 and shaft 3 is filled with fuel.

[0029] The shaft 3 comprises at one end a ball 4 which sits on the opening of the passage 7 and is fixed at its other end to the plunger 5 .

[0030] The spring 6 pushes the plunger 5 downwards in such a way that the ball 4 keeps the closed passage 7 open. A passageway 7 is arranged through an end plug of the common rail to allow draining of the common rail to a fuel tank (not shown).

[0031] The spring 6 is held by a bearing cap 8 which partially surrounds the plunger 5 and the gap or void is filled with fuel.

[0032] The clearance is large enough to allow free movement of the plunger.

[0033] The solenoid coil 9 is energized to increase the force applied downwards on the ball. When the coil 9 reduces the force applied to the ball, fluid pres...

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PUM

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Abstract

An electrovalve that discharges a common rail while maintaining a minimum pressure, comprising a solenoid in which is disposed a movable plunger that controls the displacement of a movable shaft engaged with a ball valve, the movable rod The plug in the closed position of the ball valve is urged by a spring housed in the bearing cap, where the bottom wall of the bearing cap surrounds the outer surface of the movable plunger, wherein the gap between the outer surface of the plunger and the inner wall of the bearing cap is filled with fuel The membrane, the opening movement of the plunger causes fuel to flow from the chamber at the top of the plunger to the hole in which the shaft is arranged, wherein a sleeve of controlled thickness is arranged to surround the plunger in the gap Determine the thickness of the fuel film.

Description

technical field [0001] The invention relates to a fuel delivery system for an internal combustion engine. Background technique [0002] One type of known fuel injection system for an internal combustion engine includes a high pressure pump, a common rail and a plurality of fuel injectors, each fuel injector being associated with a respective combustion chamber of the engine. [0003] The high pressure pump is arranged to receive fuel at low pressure from a fuel source, eg a vehicle fuel tank, and to pump fuel into the common rail at a high pressure, eg 2000 bar. A common rail supplies each of the plurality of fuel injectors with fuel at high pressure. [0004] It is known to control the delivery of fuel at high pressure to the common rail by means of an electrovalve (flow metering valve) on the low-pressure side of the pump. EP0990791 and JP2004011448 disclose prior art valves. A second electrovalve located at one end of the high-pressure common rail functions to vent the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M61/12F02M63/02F02M63/00F16K31/06
CPCF02M61/12F02M63/0015F02M63/0225F02M63/025F02M63/0007F16K31/0658
Inventor M·马雷夏尔F·索瓦热C·卡东
Owner DELPHI TECH IP LTD