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Fuel supply equipment of common rail type fuel injection system and fuel supply control method

A fuel injection system and fuel supply technology, applied in fuel injection control, fuel injection pumps, fuel injection devices, etc., can solve problems such as fuel leakage

Inactive Publication Date: 2014-08-06
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But fuel still leaks through the operating gap of the metering unit and continues to flow to the high pressure pump

Method used

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  • Fuel supply equipment of common rail type fuel injection system and fuel supply control method

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Embodiment Construction

[0012] figure 1 A schematic diagram showing a fuel supply device of a common rail fuel injection system according to an embodiment of the present invention. The fuel supply device 100 comprises a low pressure pump 2 which supplies fuel from a fuel tank 4 through a filter 8 and a metering unit 10 to a high pressure pump 6 , for example a port controlled reciprocating pump 6 .

[0013] The metering unit 10 is also referred to as a fuel control unit. The metering unit 10 is electronically controlled to regulate the amount of fuel supplied to the high pressure pump 6 based on the pressure at the common rail 12 .

[0014] The high-pressure pump 6 has a port through which fuel is supplied to said pump 6 from the metering unit 10 . The ports control fuel flow to the pump body. A piston in the high pressure pump 6 moves up and down to pressurize fuel and supply it to the common rail 12 .

[0015] The metering unit 10 is controlled based on the fuel pressure at the common rail 12 ....

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Abstract

Disclosed are fuel supply equipment (100) of a common rail type fuel injection system and a fuel supply control method. The fuel supply equipment (100) includes a lower pressure pump (2) which supplies fuel from a fuel tank (4) to a high pressure pump (6), such as a port-controlled reciprocating pump (6), through a fitler (8) and a meterin unit (10). A one-way valve (14) is arranged between an outlet of the metering unit (10) and an inlet of the high pressure pump (6). The one-way valve (14) selectively supplies fuel output by the metering unit (10) to the high pressure pump (6) according to fuel pressure at an output position of the metering unit (10) / A retrun pipeline (16) connects output of the metering unit (10) to the fuel tank (4). A throttling device (18) on the return pipeline (16) selectively supplies a part of fuel output from the metering unit (10) to the fuel tank (4).

Description

technical field [0001] The present invention relates to a fuel supply device and a fuel supply control method for a common rail fuel injection system. More specifically, the present invention relates to controlling the fuel supply to a high pressure pump for a common rail fuel injection system. Background technique [0002] In a common rail fuel injection system, a low pressure pump feeds fuel from the fuel tank through a metering unit to the high pressure pump. The metering unit regulates the amount of fuel supplied to the high pressure pump. The high pressure pump pressurizes the fuel and supplies it to the common rail. In some cases, such as when the car is traveling downhill, fuel is not supplied to the injectors. If the pump continues to supply fuel to the common rail, fuel pressure in the common rail may increase to unsafe levels. Thus, the metering unit is switched off when the pressure at the common rail exceeds a certain value, in order to avoid continued fuel s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M41/00F02D1/02
Inventor S·沙斯坎斯N·纳格斯B·萨克希维
Owner ROBERT BOSCH GMBH
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