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Fuel injection device

A fuel injection device and a technology of fuel injection, which can be applied to fuel injection devices, special fuel injection devices, fuel injection valves driven by fluid pressure, etc., and can solve problems such as deterioration of control performance

Active Publication Date: 2012-12-19
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the control performance of the injected fuel may be deteriorated

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0030] refer to figure 1 to 4 and Figure 12 A description is given of the first embodiment of the present invention. figure 1 is a cross-sectional view showing the fuel injection device 100 of the first embodiment in which its fuel injection hole 14 is closed.

[0031] The fuel injection device 100 injects fuel into a combustion chamber (not shown) of an internal combustion engine that uses liquid gas type dimethyl ether (DME) as fuel. The fuel injection device 100 is installed for each cylinder, which forms a combustion chamber of the internal combustion engine. The fuel injection device 100 controls fuel injection according to an injection command signal received from an electronic control device (not shown).

[0032] Next, dimethyl ether will be explained. DME is synthesized using natural gas, coal bed methane, coal, or biomass as a raw material, and includes ether linkages in which carbon is held together by oxygen. DME has a higher cetane number than light oil and, ...

no. 2 example

[0092] Figure 6 is a cross-sectional view of a fuel injection device 200 according to a second embodiment of the present invention, showing the closed state of the injection hole 14 . This embodiment is similar to the first embodiment except that the discharge side passage 46 is formed in the fuel injection device 200 instead of the inlet side passage 32 of the fuel injection device 100 of the first embodiment. The discharge side passage 46 is a passage connecting the discharge passage 34 and the spring chamber 18 . An end portion of the discharge-side passage 46 on the side of the discharge-side passage 34 opens in the outlet constriction 36 . The discharge side channel 46 has a discharge side constriction 46 a at the portion of the discharge side channel 46 that opens into the inner wall of the outlet constriction 36 . The passage cross-sectional area (minimum passage cross-sectional area) Aej2 of the discharge-side constriction 46 a is smaller than the passage cross-sect...

no. 3 example

[0112] Figure 9 is a cross-sectional view of a fuel injection device 300 according to a third embodiment of the present invention, showing the closed state of the injection hole 14 . In this embodiment, the discharge side passage 46 of the fuel injection device 200 of the second embodiment is added to the fuel injection device 100 of the first embodiment, and a check valve 48 is provided in the middle of the inlet side passage 32 . One-way valve 48 enables fuel to flow from spring chamber 18 to feed passage 28 but does not allow fuel to flow from feed passage 28 to spring chamber 18 .

[0113] Even with this configuration, when the discharge passage 34 is opened with the valve element 86 , the fuel of the spring chamber 18 is output from the spring chamber 18 through the inlet-side passage 32 and the discharge-side passage 46 . Therefore, the spring chamber pressure Psp may be reduced during the valve opening time of the nozzle needle 50 and the valve closing time of the noz...

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Abstract

The present invention provides a fuel injection device. An inlet necking (30) forms in a fuel feed channel (28) which is disposed between an input port (25) and a console cabinet (20) and is suitable for receiving fuel at the input port (25) and then feed the fuel to the control cabinet (20). Feed neckings (32a, 46a) form in fuel feed channels (32, 46) which are disposed between the input port (25) and a middle cabinet (18) and are suitable for receiving fuel at the input port (25) and then feed the fuel to the middle cabinet (18). A cross sectional area of the smallest channel of the feed neckings (32a, 46a) is smaller than that of the inlet necking (30). When a valve member (86) moves from a valve opening position to a valve closing position, pressure increment of the middle cabinet (18) is put off compared with that of the console cabinet (20).

Description

technical field [0001] The invention relates to a fuel injection device. Background technique [0002] For example, JPH09-032681A teaches a fuel injection device including a nozzle valve member and a control piston member. The nozzle valve member axially reciprocates to enable and disable supply of fuel from a nozzle chamber of a main body of a fuel injection device to a fuel injection hole, and thereby enable and disable fuel injection to a combustion chamber of an internal combustion engine through the injection hole middle. The control piston member controls axial movement of the nozzle valve member. In an injection device having a nozzle valve member and a control piston member arranged successively one behind the other in the axial direction, a control chamber is formed on the side of the control piston member opposite to the injection hole, an intermediate chamber is formed on the Between the control piston member and the nozzle valve member. Therefore, in this fue...

Claims

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Application Information

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IPC IPC(8): F02M21/02
CPCF02M21/02F02M47/027F02M2200/28F02M2547/008F02M55/008F02M47/02
Inventor 加藤正明
Owner DENSO CORP
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