Fuel supply system having pressure control valve

A fuel supply system and high-pressure fuel technology, applied in the field of pressure control valves, can solve the problems of fuel consumption, deterioration of starting performance, and insufficient completion of fuel pressurization.

Inactive Publication Date: 2011-06-01
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, pressurization of fuel may not be sufficiently completed, which may lead to deterioration of fuel consumption and starting performance

Method used

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  • Fuel supply system having pressure control valve
  • Fuel supply system having pressure control valve
  • Fuel supply system having pressure control valve

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0071] The fuel supply system to which the pressure control valve according to the first embodiment of the present invention is applied is a fuel supply system 1 for a direct injection type internal combustion engine in which fuel is directly injected to the in the cylinder (combustion chamber). Such as figure 1 As shown, the fuel supply system 1 includes a fuel tank 10, a high-pressure pump 20, a fuel delivery pipe 15, a fuel injection device (injector) 17, a pressure relief valve 30, a pressure maintaining valve 40 (also called a constant residual pressure valve), A fuel pressure sensor 18, a controller (electronic control unit) 19, and the like. The pressure control valve 100 includes a pressure relief valve 30, a pressure maintaining valve 40, and the like.

[0072] Fuel is drawn from a fuel tank 10 by a low-pressure fuel pump 11 and supplied to a high-pressure fuel pump 20 via a low-pressure fuel pipe 12 . Fuel is pressurized by a high-pressure fuel pump 20 and supplie...

no. 2 approach

[0146] will refer to Figure 10A and 10B A fuel supply system to which the pressure control valve according to the second embodiment of the present invention is applied is explained.

[0147] According to the second embodiment, when the controller 19 determines at step S4 that the flag for the abnormal situation stored in the memory is "1", that is, "Yes" at step S4, until the fuel in the fuel delivery pipe 15 The process continues until the pressure becomes higher than a predetermined value ( Figure 10B , "No" at step S6), then the fuel pressure in the fuel delivery pipe 15 becomes higher than a predetermined value ( Figure 10B , YES at step S6), the process shifts to cleaning mode operation.

[0148] The predetermined value here refers to a pressure close to but lower than the first pressure. Furthermore, the predetermined value refers to a pressure in the fuel delivery pipe 15 close to the maximum fuel injection pressure for the injection 17 during acceleration of the...

no. 3 approach

[0151] will refer to Figure 11 A pressure control valve according to a third embodiment of the present invention is explained. The shapes of the stopper 50 and the first spring 55 of the relief valve 30 according to the third embodiment are different from those in the first embodiment.

[0152] The stopper 50 is formed in a cylindrical shape having a large diameter portion 51 and a small diameter portion 52 . The outer peripheral wall of the large-diameter portion 51 is fixed to the inner peripheral wall of the fuel return pipe 14 . The small-diameter portion 52 extends from one end of the large-diameter portion 51 in the direction toward the fuel delivery pipe 15 .

[0153] A first through hole 53 is formed in the stopper 50 , the first through hole 53 extending in the axial direction thereof so that both axial end spaces thereof communicate with each other. A second through hole 54 is formed in the small diameter portion 52 , wherein the second through hole 54 extends in...

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PUM

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Abstract

A pressure control valve (100) is provided in a fuel return pipe (14) connected between a high pressure fuel pipe (16) and a fuel pressurizing chamber (27) of a high pressure pump (20). A pressure relief valve (30) is opened when fuel pressure in a fuel delivery pipe (15) is higher than a first pressure. A first valve body (31) of the pressure relief valve (30) is brought into contact with a stopper so that a movement of the first valve body (31) is limited. A pressure holding valve (40), which is provided in an inside of the first valve body (31), is opened when the fuel pressure in the fuel delivery pipe (15) is larger than a second pressure. When the pressure relief valve (30) is opened and the first valve body crashes into the stopper (33), a lifting amount of a second valve body (43) of the pressure holding valve (40) is increased by inertia of the second valve body (43), so that extraneous material attached to the second valve body (43) can be removed.

Description

technical field [0001] The present invention relates to a fuel supply system for an internal combustion engine, and in particular, the present invention relates to a pressure control valve provided in the fuel supply system. Background technique [0002] In a conventional fuel supply system for a direct injection (direct injection) type gasoline engine, fuel from a fuel tank is pressurized by a high-pressure pump and the pressurized high-pressure fuel is supplied to and stored in a fuel delivery pipe , so that high-pressure fuel is injected into the combustion chamber of the engine through the fuel injection device connected to the fuel delivery pipe. [0003] In said type of fuel supply system, a pressure relief valve is provided to reduce the fuel pressure in the fuel delivery pipe when the fuel pressure in the fuel delivery pipe increases to a value higher than a predetermined pressure at which , fuel injection may become impossible by the fuel injection device. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M69/26F02M37/04F02D41/04
CPCF02M59/466F02M2200/315F02D2250/04F02M63/0056F02M63/0245F02M59/366F02D41/126F02M63/028F02M2200/08F02M59/46F02M63/0077F02D2041/224F02M37/0023F02M63/005F02M63/0052F02D41/3863F02M63/025
Inventor 铃木隆小林正幸伊藤嘉彦及川忍井上宏史
Owner DENSO CORP
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