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Fuel injector for internal combustion engine

一种燃料喷射装置、内燃机的技术，应用在燃料喷射装置、装料系统、机械设备等方向，能够解决减压不足、减压控制稳定性差、过于减压等问题，达到提高响应性及控制性的效果

Inactive Publication Date: 2009-08-05
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] When such a large fuel pressure is decompressed, as described in Patent Document 1, if one pulse is supplied to the supply valve to depressurize, the decompression may be too much or the decompression may be insufficient, and the decompression control may become unstable. sex problem

Method used

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  • Fuel injector for internal combustion engine
  • Fuel injector for internal combustion engine
  • Fuel injector for internal combustion engine

Examples

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Embodiment Construction

[0049] Below, combine Figure 1 to Figure 9 , the configuration and operation of the fuel injection device for an internal combustion engine according to the first embodiment of the present invention will be described.

[0050] First, combine figure 1 , the configuration of a system in which the fuel injection device for an internal combustion engine according to this embodiment is applied to a fuel supply device for a direct-injection gasoline engine will be described.

[0051] figure 1 It is a configuration diagram of a system in which the fuel injection device for an internal combustion engine according to the first embodiment of the present invention is applied to a fuel supply device for a direct-injection gasoline engine.

[0052] Fuel in the fuel tank 100 is pumped up by a low-pressure fuel pump 101 , passes through a fuel filter (not shown), and is supplied to a high-pressure fuel pump 103 via a low-pressure pipe 102 . The pressure of the fuel supplied to the high-p...

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Abstract

Disclosed herein is a fuel injector for an internal combustion engine, which can achieve the improved responsiveness to the target fuel pressure as well as the improved controllability even when the fuel pressure is greatly decreased. A fuel injector for an internal combustion engine: a high pressure pump 103 for pressure feeding high pressure fuel of the internal combustion engine; a fuel rail 105 for accumulating the fuel that has been pressure fed by the high pressure pump; an injection valve 106 for injecting, into a cylinder, the fuel accumulated in the fuel rail; a fuel pressure sensor 104 for detecting the pressure of the fuel that is accumulated in the fuel rail; an electromagnetic relief valve 107 for discharging the pressure accumulated fuel of the fuel rail; and an ECU 110 for controlling opening and closing of the electromagnetic relief valve 107. The ECU 110 repeats the opening and closing of the relief valve to discharge the fuel pressure in stages so that the fuel pressure in the fuel rail is decreased down to the target fuel pressure.

Description

technical field [0001] The present invention relates to a fuel injection device for an internal combustion engine, and more particularly to a fuel injection device for an internal combustion engine equipped with a pressure control valve for reducing pressure on a fuel rail that stores fuel for the internal combustion engine. Background technique [0002] As a mechanism to increase the fuel pressure in the fuel rail during normal operation of the internal combustion engine, the general method is to press the fuel with a high-pressure fuel pump. As a decompression mechanism, the general method is to stop the pressure from the high-pressure pump Each cylinder injects fuel, reducing fuel pressure in the fuel rail. This method only needs to inject fuel for reducing the fuel pressure, wasting fuel in vain. [0003] In contrast, in a fuel system that injects fuel into each cylinder from a fuel rail that stores fuel pumped by a high-pressure fuel pump through a fuel injection valve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M55/02
CPCF02D2250/31F02D41/3845F02D41/3863F02D2200/0602
Inventor 塚田伸作江原秀治冈本多加志
Owner HITACHI LTD