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Fuel feed apparatus and accumulator fuel injection system having the same

A fuel injection system and fuel supply technology, applied in the direction of charging system, liquid fuel feeder, mechanical equipment, etc., can solve the problem of fuel supply equipment becoming larger

Active Publication Date: 2011-11-23
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the diameter of the inlet pipe makes the fuel supply equipment larger

Method used

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  • Fuel feed apparatus and accumulator fuel injection system having the same
  • Fuel feed apparatus and accumulator fuel injection system having the same
  • Fuel feed apparatus and accumulator fuel injection system having the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0021] The following will refer to figure 1 The first embodiment is described.

[0022] The accumulator fuel injection system is applied to, for example, a four-cylinder diesel engine. The accumulator fuel injection system includes: a common rail 1 for accumulating high-pressure fuel; an injector 2 for injecting high-pressure fuel from the common rail 1 into the combustion chamber of the diesel engine; and a fuel supply device 3 for High-pressure fuel is supplied into the common rail 1 .

[0023] Common rail 1 functions as a pressure accumulation unit for accumulating high-pressure fuel supplied from fuel supply device 3 and for containing the high-pressure fuel at a target common-rail pressure. A control unit (ECU), not shown, determines the target common rail pressure according to operating conditions such as the throttle position of the accelerator pedal and the rotational speed of the diesel engine.

[0024] The common rail 1 is provided with a pressure limiter 1a that ...

no. 2 example

[0060] In this example, as figure 2 As shown, the orifice 20 is configured to function as a backflow control unit.

[0061] Orifice 20 is a fixed throttling device for reducing the fuel pressure downstream of feed pump 5 . The capillary can be used as a fixed throttling device to function as a backflow control unit. In this embodiment, the orifice 20, i.e. the return control unit, is provided to the return channel 14, so that the amount of fuel returned through the return channel 14 can be correspondingly increased, thereby increasing the upstream of the feed pump 5 and the downstream of the feed pump 5. pressure difference between.

[0062] In this structure, as the fuel pressure downstream of the feed pump 5 increases to a predetermined pressure at which the pressure reducing valve 13 opens, the amount of fuel returned through the return passage 14 can be increased. The structure of the fuel supply device other than the features of this embodiment is basically the same a...

no. 3 example

[0065] exist image 3 In this embodiment shown, a breather valve 21 is provided to the fuel supply device in the first embodiment for discharging gas accumulated in the fuel supply passage.

[0066] The vent valve 21 has a structure similar to that of the pressure reducing valve 13 . The vent valve 21 is provided at a position downstream of the feed pump 5 where gas easily accumulates. Specifically, the breather valve 21 is provided, for example, at a vertical upper portion of a housing housing the fuel filter 12 .

[0067] In addition, the breather valve 21 is opened at a predetermined pressure which is equal to or lower than the allowable pressure of the fuel filter 12 and which is lower than the predetermined pressure at which the pressure reducing valve 13 is opened. When the fuel pressure downstream of the feed pump 5 increases so that the breather valve opens, the gas accumulated in the fuel passage returns to the fuel tank 4 through the fuel pipe 13 a together with th...

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Abstract

A fuel feed apparatus is provided for supplying high-pressure fuel to a common rail of an accumulator fuel injection system. The accumulator fuel injection system includes an injector for injecting high-pressure fuel accumulated in the common rail into a combustion chamber of an internal combustion engine. The fuel feed apparatus includes a high-pressure pump for press-feeding fuel to the common rail, and a feed pump for pumping fuel from a fuel tank to the high-pressure pump. A fuel filter is provided downstream of the feed pump for filtering fuel pumped from the feed pump. A return passage is provided for returning fuel from a downstream of the feed pump to an upstream of the feed pump. A return flow control unit is provided for controlling fuel retuning through the return passage.

Description

technical field [0001] The invention relates to a fuel supply device for an internal combustion engine. The invention furthermore relates to an accumulator fuel injection system having such a fuel supply device. Background technique [0002] Generally, US20060169251 (JP-A-2006-207499) discloses a fuel supply device provided to an accumulator fuel injection system of a diesel engine. The fuel supply equipment includes a supply pump and a high pressure pump. The feed pump supplies fuel from the fuel tank to the high pressure pump. The high-pressure pump pressure-supplies high-pressure fuel to a common rail provided to accumulate high-pressure fuel in the accumulator fuel injection system. [0003] The fuel supply device in US 20060169251 also includes a fuel filter and a relief valve. A fuel filter is provided downstream of the feed pump for filtering fuel. When the pressure becomes equal to or greater than a predetermined pressure, the pressure reducing valve releases th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M37/22
CPCY02T10/123Y02T10/12
Inventor 铃木雅词岛居宏行长井满
Owner DENSO CORP
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