JP6146365B2 - Fuel supply system - Google Patents

Description

  The present invention relates to a fuel supply system that supplies fuel to an internal combustion engine.

  2. Description of the Related Art Conventionally, there is known a fuel supply system that can selectively switch fuel supply to either an intake passage communicating with a combustion chamber of an internal combustion engine or a combustion chamber. For example, Patent Document 1 discloses a low pressure rail having an intake passage fuel injection valve for injecting fuel into an intake passage according to an operating state of an internal combustion engine and a high pressure having a combustion chamber fuel injection valve for injecting fuel into a combustion chamber. A fuel supply system for supplying fuel through a high pressure pump to the rail is described.

JP 2011-179319 A

  Generally, in a high-pressure pump that pressurizes fuel so that it can be supplied to a high-pressure rail, a plunger reciprocates in the high-pressure pump in conjunction with a reciprocating movement of a piston in an internal combustion engine. When the plunger reciprocates in the high pressure pump, the heat generated by the friction between the inner wall of the pump body and the plunger is taken away by the fuel passing through the pressurizing chamber. However, in the fuel supply system described in Patent Document 1, when fuel is supplied to the low-pressure rail, the fuel flows to the low-pressure rail without passing through the pressurizing chamber, so that heat generated by the reciprocating movement of the plunger is taken away by the fuel. Disappear. For this reason, bubbles are generated in the fuel due to the heat generated by the reciprocating movement of the plunger, and when supplying the fuel to the high-pressure rail, the fuel may not be pressurized to a desired pressure.

  An object of the present invention is to provide a fuel supply system capable of pressurizing fuel to a desired pressure.

The first disclosure is a fuel supply system capable of selectively switching the supply of fuel to either the intake passage (9) communicating with the combustion chamber (8) of the internal combustion engine (7) or the combustion chamber. A low pressure pump (10), a high pressure pump (20), an intake passage fuel pressure accumulating member (30), a combustion chamber fuel pressure accumulating member (40), a fluid control valve (51, 52, 53, 54, 55), and And a control unit (57).
The low-pressure pump pumps the fuel stored in the fuel tank (11) .
The high pressure pump can pressurize the fuel pumped by the low pressure pump .
The intake passage fuel pressure accumulating member has an intake passage fuel injection valve (31) for injecting fuel into the intake passage and accumulates fuel flowing out from the high-pressure pump .
The combustion chamber fuel pressure accumulating member has a combustion chamber fuel injection valve (41) for injecting fuel into the combustion chamber, and accumulates fuel flowing out from the high-pressure pump .
The fluid control valve communicates or blocks the inside of the high-pressure pump and the inside of the fuel storage member for the intake passage .
The control unit controls operations of the high pressure pump and the fluid control valve.
In the first disclosure, the high-pressure pump, pressing the low-pressure pump to form a fuel pressurizable a pressure chamber for pumping (211) (21), pressure chamber inlet passage fuel flowing flows ( 201) a fuel pressure control valve portion (23) that closes in response to a command from the control portion when pressurizing fuel introduced into the pressurizing chamber, and a first outflow flow through which the fuel flowing out from the pressurizing chamber flows The difference between the pressure of the fuel in the pressurizing chamber provided in the passage (202) and the pressure of the fuel in the connection passage (251) communicating with the first outflow passage on the downstream side of the first outflow passage becomes greater than a certain level. It characterized by having a check valve unit (24) which opens valve when.
The second disclosure is a fuel supply system capable of selectively switching the supply of fuel to either the intake passage (9) communicating with the combustion chamber (8) of the internal combustion engine (7) or the combustion chamber. The low pressure pump (10), the high pressure pump (20), the fuel storage member for intake passage (30), the fuel storage member for combustion chamber (40), the fluid control valve (51, 52, 53, 54, 55). , A first combustion chamber pipe (401), a first intake passage pipe (301), and a controller (57).
The low-pressure pump pumps the fuel stored in the fuel tank (11).
The high-pressure pump (20) includes a pressurization section (21) that forms a pressurization chamber (211) capable of pressurizing fuel pumped by the low-pressure pump, and an inflow passage (201) through which fuel flowing into the pressurization chamber flows. The fuel pressure control valve portion (23) provided and the first outflow passage (202) provided in the first outflow passage (202) through which the fuel outflowing from the pressurization chamber flows and the downstream side of the first outflow passage and the pressure of the fuel in the pressurization chamber. 1 has a check valve part (24) which opens when the difference between the pressure of the fuel in the connection flow path (251) communicating with the outflow flow path becomes a certain value or more. The high pressure pump can pressurize the fuel pumped by the low pressure pump.
The intake passage fuel pressure accumulating member (30) has an intake passage fuel injection valve (31) for injecting fuel into the intake passage, and accumulates fuel flowing out from the high-pressure pump.
The combustion chamber fuel pressure accumulating member (40) has a combustion chamber fuel injection valve (41) that injects fuel into the combustion chamber, and accumulates fuel flowing out from the high-pressure pump.
The fluid control valves (51, 52, 53, 54, 55) communicate or block the inside of the high-pressure pump and the inside of the fuel storage member for the intake passage.
The 1st combustion chamber piping (401) connects the connection piping (25) which forms a connection flow path, and the fuel storage member for combustion chambers.
The first intake passage pipe (301) connects the connection pipe and the intake passage fuel pressure accumulating member.
The control unit (57) controls the operation of the high pressure pump and the fluid control valve.
In the second disclosure, the fuel pressure control valve portion closes in response to a command from the control portion when pressurizing the fuel introduced into the pressurizing chamber.

  In the fuel supply system of the present invention, when relatively high pressure fuel is supplied to the combustion chamber fuel pressure accumulating member, the opening and closing of the fuel pressure control valve portion is controlled while the fluid control valve is closed. Thereby, the fuel pumped by the low pressure pump is pressurized in the pressurizing chamber and supplied to the fuel accumulating member for the combustion chamber. On the other hand, when relatively low pressure fuel is supplied to the fuel pressure storage member for the intake passage, the fuel pressure control valve portion is opened to pass through the pressurizing chamber without pressurizing the fuel pumped by the low pressure pump. . Thereby, the fuel pressure-fed by the low-pressure pump is supplied to the fuel storage member for the intake passage without being pressurized in the pressurizing chamber. Therefore, even when the fuel is supplied to the fuel storage member for the intake passage, the fuel passing through the pressurizing chamber can take away the heat generated by the high pressure pump. Therefore, it is possible to prevent bubbles from being generated in the fuel by the heat of the high-pressure pump and pressurize the fuel to a desired pressure.

1 is a schematic diagram of a fuel supply system according to a first embodiment of the present invention. It is a schematic diagram of the fuel supply system by 2nd Embodiment of this invention. It is a schematic diagram of the fuel supply system by 3rd Embodiment of this invention. It is a schematic diagram of the fuel supply system by 4th Embodiment of this invention. It is a schematic diagram of the fuel supply system by 5th Embodiment of this invention.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
A fuel supply system according to a first embodiment of the present invention will be described with reference to FIG. The fuel supply system 1 is a system that supplies fuel, for example, gasoline, to a combustion chamber 8 of an engine 7 as an “internal combustion engine”. The fuel supply system 1 switches the fuel supply system 1 to supply fuel to either the intake passage 9 communicating with the combustion chamber 8 or the combustion chamber 8 according to the operating state of the vehicle on which the engine 7 is mounted. The fuel supply system 1 includes a low-pressure pump 10, a high-pressure pump 20, a low-pressure rail 30 as an “intake passage fuel storage member”, a high-pressure rail 40 as a “combustion chamber fuel storage member”, a fluid control valve 51, and a control unit 57. Etc. In FIG. 1, the flow of intake air taken into the engine 7 is indicated by an arrow F1. Further, the flow of exhaust discharged from the engine 7 is indicated by an arrow F2.

  The low-pressure pump 10 is provided in a fuel tank 11 that stores gasoline. The low pressure pump 10 is connected to the high pressure pump 20 via the fuel pipe 101. The low pressure pump 10 sucks the fuel in the fuel tank 11 and pumps the fuel toward the high pressure pump 20. The fuel pipe 101 is provided with a pressure adjusting valve 12 that adjusts the pressure of the fuel pumped by the low pressure pump 10.

  The high-pressure pump 20 is provided so that the fuel pumped by the low-pressure pump 10 can be pressurized to a pressure that can be directly injected into the combustion chamber 8 as a “desired pressure”. The high-pressure pump 20 includes a pump body 21 as a “pressurizing unit”, a plunger 22, a fuel pressure control valve unit 23, a check valve unit 24, and the like.

  The pump body 21 has a pressurizing chamber 211. Fuel that is pumped by the low-pressure pump 10 is introduced into the pressurizing chamber 211 via a fuel pressure control valve portion 23 described later. The pressurizing chamber 211 communicates with the inside of the fuel pressure control valve portion 23 via an inflow channel 201 formed in the pump body 21. The pressurizing chamber 211 communicates with a first outflow passage 202 formed in the pump body 21 and provided with a check valve portion 24.

  The plunger 22 is slidably provided on the inner wall of the pump body 21 that forms the pressurizing chamber 211. The plunger 22 reciprocates with respect to the pump body 21 by the rotational movement of the cam 221 provided on the cam shaft of the engine 7. An end surface 222 of the plunger 22 opposite to the side in contact with the cam 221 forms a pressurizing chamber 211 together with the inner wall of the pump body 21. Thereby, the volume of the pressurizing chamber 211 can be changed by the reciprocating movement of the plunger 22.

  The fuel pressure control valve unit 23 is an electromagnetic valve provided in the inflow channel 201 between the low pressure pump 10 and the pressurizing chamber 211. The fuel pressure control valve unit 23 is electrically connected to a control unit 57 described later. The fuel pressure control valve unit 23 includes a valve member 231, a valve seat 232, a coil 233, a fixed core 234, a movable core 235, and the like.

The valve member 231 is accommodated so as to be capable of reciprocating in the central axis direction of the fuel pressure control valve portion 23. A first spring 236 is provided on the pressure chamber 211 side of the valve member 231. The first spring 236 urges the valve member 231 to contact the valve seat 232.
The coil 233 is connected to the control unit 57. A fixed core 234 is provided inside the diameter of the coil 233. The movable core 235 is provided on the fixed core 234 side of the valve member 231. Between the fixed core 234 and the movable core 235, a second spring 237 that urges the fixed core 234 and the movable core 235 in the direction of separating is provided. The second spring 237 is formed so that the biasing force is larger than the biasing force of the first spring 236. In the fuel pressure control valve portion 23, when no electromagnetic attractive force is generated between the fixed core 234 and the movable core 235, the valve member 231 is separated from the valve seat 232 as shown in FIG. When an electromagnetic attractive force is generated between the movable core 235 and the valve member 231, the valve seat 232 comes into contact. In the fuel pressure control valve portion 23, the valve member 231 is separated from the valve seat 232 during the intake stroke of the fuel in the high-pressure pump 20, that is, during the lowering of the plunger 22 in which the volume of the pressurizing chamber 211 increases.

The check valve portion 24 is provided in the first outflow passage 202 on the opposite side of the pressurizing chamber 211 from the side where the fuel pressure control valve portion 23 is provided. The check valve portion 24 is formed of a valve member 241 and a spring 242.
The valve member 241 is provided on the pressure chamber 211 side of the check valve portion 24 so as to be able to contact a valve seat surface 243 formed on the inner wall of the pump body 21. The spring 242 biases the valve member 241 so that the valve member 241 contacts the valve seat surface 243. The biasing force of the spring 242 is set lower than the pressure of fuel supplied to the low-pressure rail 30 described later.

  In the check valve unit 24, the difference between the fuel pressure in the pressurizing chamber 211 and the fuel pressure in the connection channel 251 communicating with the first outflow channel 202 on the downstream side of the first outflow channel 202 is greater than a certain level. As a result, the valve member 241 is separated from the valve seat surface 243. As a result, the fuel in the pressurizing chamber 211 flows through the connection channel 251. The connection pipe 25 that forms the connection flow path 251 is connected to the low-pressure fuel pipe 301 and the high-pressure fuel pipe 401.

  The low pressure rail 30 has an intake passage injector 31 as an “intake passage fuel injection valve” for injecting fuel into the intake passage 9. The low-pressure rail 30 is connected to the connection pipe 25 via a low-pressure fuel pipe 301 as a “first intake passage pipe”. The low pressure rail 30 temporarily accumulates relatively low pressure fuel injected by the intake passage injector 31.

  The high-pressure rail 40 has a direct injection injector 41 as a “combustion chamber fuel injection valve” that injects fuel into the combustion chamber 8. The high-pressure rail 40 is connected to the connection pipe 25 via a high-pressure fuel pipe 401 serving as a “first combustion chamber pipe”. The high-pressure rail 40 temporarily stores relatively high-pressure fuel injected by the direct injection injector 41.

  The fluid control valve 51 is provided at a site where the connection pipe 25, the low pressure fuel pipe 301, and the high pressure fuel pipe 401 are connected. The fluid control valve 51 is electrically connected to the control unit 57. The fluid control valve 51 is a so-called three-way valve, and switches the flow path so that the fuel flowing through the connection pipe 25 is supplied to the low pressure rail 30 or the high pressure rail 40 in accordance with a signal output from the control unit 57. The fluid control valve 51 controls the amount of fuel supplied to the low pressure rail 30 or the high pressure rail 40.

  The control unit 57 is configured mainly with a microcomputer. The control unit 57 controls the operation of the fuel pressure control valve unit 23 and the fluid control valve 51 in accordance with, for example, the operating state of the engine 7 such as the rotational speed input from the outside, the accelerator opening degree by the driver, and the like.

Next, the operation of the fuel supply system 1 will be described.
When the fuel supply system 1 supplies fuel directly to the combustion chamber 8 by the direct injection injector 41, the fuel pressure control valve unit 23 is closed by a command from the control unit 57 when the plunger 22 is raised. The timing for closing the fuel pressure control valve 23 is determined by the required fuel flow rate obtained from the required fuel pressure in the high-pressure fuel pipe 401 and the fuel consumption in the direct injection injector 41. When the fuel pressure control valve portion 23 is closed, the pressure of the fuel pressurized in the pressurizing chamber 211 is equal to the value obtained by dividing the urging force of the spring 242 by the seat diameter of the valve seat surface 243. It becomes the value which added. In the fuel supply system 1, when the fuel pressure in the connection flow path 251 is relatively low, the fuel pressure in the connection flow path 251 is gradually increased by pressurizing the fuel multiple times in the high-pressure pump 20, and the direct injection injector The pressure 41 is increased to a pressure at which injection into the combustion chamber 8 is possible. The pressurized fuel is supplied from the connection channel 251 to the high-pressure rail 40 through the high-pressure fuel channel 402 formed by the high-pressure fuel pipe 401.

  On the other hand, when the fuel supply system 1 supplies fuel to the intake passage 9 by the intake passage injector 31, the fuel pressure control valve unit 23 maintains the valve open state regardless of the position of the plunger 22 by a command from the control unit 57. . Thereby, the fuel pumped by the low pressure pump 10 flows upstream of the check valve portion 24 of the first outflow passage 202 without being pressurized by the upper and lower portions of the plunger 22. In the fuel supply system 1, when the flow path through which the fuel flows so as to use the intake manifold injector 31 after using the direct injection injector 401 is switched from the high pressure fuel flow path 402 to the low pressure fuel flow path 302. The fuel pressure in the flow path 251 may be relatively high. At this time, the pressure of the fuel in the connection flow path 251 is adjusted by opening the fluid control valve 51 and injecting fuel from the intake passage injector 31. When the fuel pressure in the connection channel 251 decreases, the pressure of the fuel that passes without being pressurized in the pressurizing chamber 211 becomes a value obtained by dividing the urging force of the spring 242 by the seat diameter of the valve seat surface 243. The value becomes larger than the value obtained by adding the fuel pressure of 251 and the check valve portion 24 opens. Accordingly, the fuel that passes without being pressurized in the pressurizing chamber 211 is supplied from the connection flow path 251 to the low pressure rail 30 through the low pressure fuel flow path 302 formed by the low pressure fuel pipe 301.

  (1) When the fuel supply system 1 according to the first embodiment supplies fuel to the low-pressure rail 30, the fuel pressure control valve unit 23 maintains the valve open state, and the plunger 22 moves back and forth. Prevent fuel from being pressurized. Thereby, even when the fuel is supplied to the low pressure rail 30, the fuel passing through the pressurizing chamber 211 can take away the heat generated by the reciprocating movement of the plunger 22, and the high pressure pump 20 can be cooled. Therefore, when the fuel supply destination is switched from the low pressure rail 30 to the high pressure rail 40 while avoiding the vapor lock phenomenon caused by bubbles generated in the fuel due to the heat generated by the reciprocating movement of the plunger 22, the fuel is brought to a desired pressure. Can be pressurized.

  (2) Moreover, if the heat generated by the reciprocating movement of the plunger is accumulated, the high-pressure pump may be deformed. In the fuel supply system 1 according to the first embodiment, the heat in the vicinity of the pressurizing chamber 211 where heat is relatively easily generated by the fuel flowing through the pressurizing chamber 211 can be taken. Thereby, seizure of the plunger 22 due to heat and deformation of the high-pressure pump 20 can be prevented.

  (3) In the fuel supply system 1 according to the first embodiment, the fluid control valve 51 is provided at a site where the connection pipe 25, the low-pressure fuel pipe 301, and the high-pressure fuel pipe 401 are connected. In the fuel supply system 1, when switching from fuel injection by the direct injection injector 41 to fuel injection by the intake passage injector 31, the fluid control valve 51 communicates the connection channel 251 and the low pressure fuel channel 302. As a result, it is possible to supply relatively low-pressure fuel to the low-pressure rail 30 while maintaining the pressure of the fuel in the high-pressure fuel flow path 402 at such a level that the direct injection injector 41 can inject. Therefore, when fuel injection by the direct injection injector 41 is performed again, the fuel inside the high-pressure rail 40 can be quickly brought to a pressure at which the direct injection injector 41 can inject. Startability can be maintained.

  (4) The fluid control valve 51 controls the flow rate of the fuel flowing through the low pressure fuel flow path 302. As a result, only the amount of fuel required for injection by the intake passage injector 31 can be sent to the low-pressure rail 30. Therefore, the pulsation of the fuel can be reduced and the variation in the injection amount into the intake passage 9 can be reduced.

(Second Embodiment)
Next, a fuel supply system according to a second embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment in the position where the fluid control valve is provided. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  In the fuel supply system 2 according to the second embodiment, the fluid control valve 52 is provided at a portion where the low pressure fuel pipe 301 and the low pressure rail 30 are connected. The fluid control valve 52 controls the amount of fuel supplied to the low pressure rail 30.

  In the fuel supply system 2 according to the second embodiment, the fluid control valve 52 is fixed to the low-pressure rail 30 having relatively high rigidity. Thereby, compared with the case where the fluid control valve 52 is fixed to the low pressure fuel pipe 301 or the high pressure fuel pipe 401, the vibration of the fluid control valve 52 due to the vibration of the engine 7 can be reduced. Therefore, the second embodiment achieves the effects (1), (2), and (4) of the first embodiment, and prevents the high-pressure pump 20 from being damaged by the vibration of the low-pressure fuel pipe 301 or the high-pressure fuel pipe 401. can do.

(Third embodiment)
Next, a fuel supply system according to a third embodiment of the present invention will be described with reference to FIG. The third embodiment differs from the first embodiment in the position where the low-pressure fuel pipe is connected. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

The fuel supply system 3 according to the third embodiment includes a low pressure fuel pipe 601 as a “second intake passage pipe” connected to the high pressure pump 20 and a high pressure fuel pipe 701 as a “second combustion chamber pipe”. have.
The low-pressure fuel pipe 601 connects the high-pressure pump 20 and the low-pressure rail 30. A low pressure fuel flow path 602 as a “second intake passage” formed by the low pressure fuel pipe 601 is formed in the pump body 21 and communicates with the pressurizing chamber 211 without passing through the check valve portion 24. The path 603 communicates with the inside of the low pressure rail 30.
The high-pressure fuel pipe 701 connects the connection pipe 25 and the high-pressure rail 40. A high-pressure fuel flow path 702 formed by the high-pressure fuel pipe 701 communicates the connection flow path 251 and the inside of the high-pressure rail 40.

  The fluid control valve 53 is provided at a site where the high-pressure pump 20 and the low-pressure fuel pipe 601 are connected. The fluid control valve 53 controls the amount of fuel supplied to the low pressure rail 30.

  In the fuel supply system 3 according to the third embodiment, when the fuel is supplied to the low-pressure rail 30, the fuel pressure control valve unit 23 maintains the valve open state, and the fuel is added in the pressurizing chamber 211 even if the plunger 22 reciprocates. Avoid pressure. At this time, the fuel in the pressurizing chamber 211 is supplied to the low pressure rail 30 through the second outflow passage 603, the fluid control valve 53, and the low pressure fuel pipe 601. As a result, the fuel supplied to the low-pressure rail 30 passes through the pressurizing chamber 211. Therefore, 3rd Embodiment has the same effect as 1st Embodiment (1), (2), (4).

  In the fuel supply system 3, the fluid control valve 53 is provided at a site where the high pressure pump 20 and the low pressure fuel pipe 601 are connected. Thereby, when the fuel is pressurized in the pressurizing chamber 211, the low-pressure fuel flow path 602 and the pressurizing chamber 211 can be reliably shut off. Therefore, a space unnecessary for pressurizing the fuel, that is, a so-called dead volume can be reduced.

(Fourth embodiment)
Next, a fuel supply system according to a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment differs from the third embodiment in the position where the fluid control valve is provided. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 3rd Embodiment, and description is abbreviate | omitted.

  In the fuel supply system 4 according to the fourth embodiment, the fluid control valve 54 is provided at a portion where the low-pressure fuel pipe 601 and the low-pressure rail 30 are connected. The fluid control valve 54 controls the amount of fuel supplied to the low pressure rail 30.

  In the fuel supply system 4 according to the fourth embodiment, the fluid control valve 54 is fixed to the low pressure rail 30 having relatively high rigidity. Thereby, compared with the case where the fluid control valve 54 is fixed to the low pressure fuel pipe 601 or the high pressure fuel pipe 701, the vibration of the fluid control valve 54 due to the vibration of the engine 7 can be reduced. Therefore, the fourth embodiment achieves the effects (1), (2), and (4) of the first embodiment, and prevents the high-pressure pump 20 from being damaged by the vibration of the low-pressure fuel pipe 601 or the high-pressure fuel pipe 701. can do.

(Fifth embodiment)
Next, a fuel supply system according to a fifth embodiment of the present invention will be described with reference to FIG. The fifth embodiment differs from the first embodiment in the position where the low-pressure fuel pipe is connected. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

The fuel supply system 5 according to the fifth embodiment includes a low pressure fuel pipe 801 as a “third intake passage pipe” connecting the high pressure rail 40 and the low pressure rail 30 and a “third combustion chamber use” connected to the high pressure pump 20. It has a high-pressure fuel pipe 901 as “pipe”.
The low-pressure fuel pipe 801 connects the low-pressure rail 30 and the high-pressure rail 40. A low pressure fuel flow path 802 formed by the low pressure fuel pipe 801 communicates the inside of the low pressure rail 30 and the inside of the high pressure rail 40. A fluid control valve 55 is fixed to a portion connected to the low-pressure fuel pipe 801 of the high-pressure rail 40.
The high-pressure fuel pipe 901 connects the connection pipe 25 and the high-pressure rail 40. A high-pressure fuel flow path 902 formed by the high-pressure fuel pipe 901 communicates the connection flow path 251 and the inside of the high-pressure rail 40.

  In the fuel supply system 5 according to the fifth embodiment, when the fuel is supplied to the low-pressure rail 30, the fuel pressure control valve portion 23 maintains the valve open state, and the fuel is added in the pressurizing chamber 211 even if the plunger 22 reciprocates. Avoid pressure. At this time, the fuel in the pressurizing chamber 211 flows into the first outflow passage 202, the check valve portion 24, the connection passage 251, the inside of the high-pressure fuel pipe 901, the inside of the high-pressure rail 40, and the low-pressure fuel pipe 801. And is supplied to the low-pressure rail 30. As a result, the fuel supplied to the low-pressure rail 30 passes through the pressurizing chamber 211. Therefore, 5th Embodiment has the same effect as 1st Embodiment (1), (2), (4).

  In the fuel supply system 5, the fluid control valve 55 is fixed to the high-pressure rail 40 having relatively high rigidity. Thus, the fifth embodiment can prevent the high-pressure pump 20 from being damaged due to vibration of the low-pressure fuel pipe 801 or the high-pressure fuel pipe 901.

(Other embodiments)
(A) In the second, fourth, and fifth embodiments, the fluid control valve is fixed to the low-pressure rail or the high-pressure rail. However, the fluid control valve may not be fixed to the low pressure rail or the high pressure rail.

  (A) In the above-described embodiment, the fluid control valve controls the flow rate of the fuel flowing through the low-pressure fuel pipe. However, the fluid control valve may not control the fuel flow rate. The flow of fuel flowing through the low-pressure fuel pipe may be turned on and off.

  As mentioned above, this invention is not limited to such embodiment, It can implement with a various form in the range which does not deviate from the summary.

1, 2, 3, 4, 5 ... fuel supply system,
7 ・ ・ ・ Engine (internal combustion engine),
8 ... combustion chamber,
9 ・ ・ ・ Intake passage,
10 ・ ・ ・ Low pressure pump,
20 ・ ・ ・ High pressure pump,
21 ... Pump body (pressurizing part),
211 ・ ・ ・ Pressurization chamber,
23 ... Fuel pressure control valve part,
24 ・ ・ ・ Check valve part,
30 ... Low pressure rail (fuel accumulator for intake passage),
40 ・ ・ ・ High-pressure rail (fuel accumulating member for combustion chamber),
51, 52, 53, 54, 55 ... fluid control valves,
57: Control unit.

Claims (10)

An intake passage (9) communicating with the combustion chamber (8) of the internal combustion engine (7) and a fuel supply system (1, 2, 3, 4, 5)
A low pressure pump (10) for pumping the fuel stored in the fuel tank (11);
A high pressure pump (20) capable of pressurizing fuel pumped by the low pressure pump;
An intake passage fuel storage valve (31) having an intake passage fuel injection valve (31) for injecting fuel into the intake passage, and accumulating fuel flowing out from the high-pressure pump;
A combustion chamber fuel pressure accumulation member (40) having a combustion chamber fuel injection valve (41) for injecting fuel into the combustion chamber, and accumulating fuel flowing out of the high pressure pump;
A fluid control valve (51, 52, 53, 54, 55) for communicating or blocking between the inside of the high pressure pump and the inside of the fuel pressure accumulating member for the intake passage;
A controller (57) for controlling the operation of the high-pressure pump and the fluid control valve;
With
The high-pressure pump includes a pressurizing portion (21) that forms a pressurizing chamber (211) capable of pressurizing fuel pumped by the low-pressure pump, and an inflow passage (201) through which fuel flowing into the pressurizing chamber flows. A fuel pressure control valve section (23) that closes in response to a command from the control section when pressurizing the fuel that is provided and introduced into the pressurization chamber; and a first outflow flow through which the fuel flowing out of the pressurization chamber flows The difference between the pressure of the fuel in the pressurizing chamber provided in the passage (202) and the pressure of the fuel in the connection channel (251) communicating with the first outflow channel downstream of the first outflow channel is constant. have a check valve unit (24) which opens when becomes higher,
A fuel supply system, wherein all of the fuel supplied to the fuel storage member for the intake passage is fuel that flows out of the pressurizing chamber . The fuel supply system according to claim 1, wherein the fluid control valve (52) is fixed to the fuel storage member for the intake passage. The high-pressure pump has a second outflow passage (603) through which fuel flowing out of the pressurizing chamber flows.
A second combustion chamber pipe (701) connecting the connection pipe (25) forming the connection flow path and the combustion chamber fuel pressure accumulating member;
A second intake passage pipe (601) that forms a second intake passage (602) that communicates the pressurization chamber and the inside of the intake passage fuel pressure storage member via the second outflow passage;
The fuel supply system according to claim 1, further comprising: The fuel supply system according to claim 3 , wherein the fluid control valve (53) is provided at a portion where the high-pressure pump and the second intake passage pipe are connected. The fuel supply system according to claim 3 , wherein the fluid control valve (54) is fixed to the fuel storage member for the intake passage. A third combustion chamber pipe (901) connecting the connection pipe (25) forming the connection flow path and the combustion chamber fuel pressure accumulating member;
A third intake passage piping (801) connecting the combustion chamber fuel pressure accumulation member and the intake passage fuel pressure accumulation member;
The fuel supply system according to claim 1, further comprising: The fuel supply system according to claim 6 , wherein the fluid control valve is fixed to the combustion chamber fuel pressure accumulating member. The fuel supply system according to any one of claims 1 to 7 , wherein the fluid control valve controls a flow rate of the fuel supplied to the intake passage fuel pressure accumulating member. An intake passage (9) communicating with the combustion chamber (8) of the internal combustion engine (7) and a fuel supply system (1, 2, 3, 4, 5)
  A low pressure pump (10) for pumping the fuel stored in the fuel tank (11);
  A pressure control part (21) forming a pressurizing chamber (211) capable of pressurizing fuel pumped by the low pressure pump, and a fuel pressure control valve provided in an inflow passage (201) through which the fuel flowing into the pressurizing chamber flows And the first outlet channel (202) provided in the first outlet channel (202) through which the fuel flowing out of the pressurizing chamber flows, and the first pressure downstream of the first outlet channel. It has a check valve part (24) that opens when the difference between the pressure of the fuel in the connection channel (251) communicating with the outflow channel exceeds a certain level, and can pressurize the fuel pumped by the low-pressure pump A high pressure pump (20);
  An intake passage fuel storage valve (31) having an intake passage fuel injection valve (31) for injecting fuel into the intake passage, and accumulating fuel flowing out from the high-pressure pump;
  A combustion chamber fuel pressure accumulation member (40) having a combustion chamber fuel injection valve (41) for injecting fuel into the combustion chamber, and accumulating fuel flowing out of the high pressure pump;
  A fluid control valve (51, 52, 53, 54, 55) for communicating or blocking between the inside of the high pressure pump and the inside of the fuel pressure accumulating member for the intake passage;
  A first combustion chamber pipe (401) connecting the connection pipe (25) forming the connection flow path and the combustion chamber fuel pressure accumulating member;
  A first intake passage pipe (301) for connecting the connection pipe and the intake passage fuel pressure accumulating member;
  A controller (57) for controlling the operation of the high-pressure pump and the fluid control valve;
  With
  The fuel pressure control valve section closes in response to a command from the control section when pressurizing the fuel introduced into the pressurizing chamber. The fluid control valve (51) is provided at a site where the connection pipe, the first combustion chamber pipe and the first intake passage pipe are connected, and the fuel for the first combustion chamber of the fuel flowing through the connection pipe is provided. The fuel supply system according to claim 9, wherein supply to the pipe or the first intake passage pipe is controlled.

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