JP2011226378A - Fuel injection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection device capable of mixing fine bubbles into fuel by a simple structure.SOLUTION: In the fuel injection device 1, a fuel pump 40 supplies the fuel reserved in a fuel tank 10 together with gas to an injector 61. A gas supply passage member 24 has a gas supply passage 25 for supplying gas containing vaporized fuel reserved in a canister 17 and gas flowing from an inflow passage 22 to the fuel pump 40. A fine bubble mixer 50 causes the gas supplied together with the fuel to be finer and mixed into the fuel. A return passage member 64 has a return passage 65 for returning the fuel in a delivery pipe 60 to the fuel tank 10. A relief valve 67 changes over the connection and disconnection of the delivery pipe 60 and the return passage 65. Thus, the canister 17 serves both to supply the gas into the fuel and to collect and reuse the vaporized fuel, thereby dispensing with a deaerator. Therefore, the fine bubbles can be mixed into the fuel with by the simple structure.

Description

  The present invention relates to a fuel injection device that injects fuel into an internal combustion engine.

  Conventionally, combustion efficiency is improved by injecting and supplying atomized fuel to a fuel chamber of an internal combustion engine. For example, in Patent Document 1, atomized droplets are atomized by atomizing air taken from outside, mixing it with liquid fuel, and injecting fuel containing fine bubbles, which is atomized air.

JP 2007-170295 A

By the way, in Patent Document 1, a defoaming device is provided in the middle of a return path from the delivery pipe to the fuel tank. In the defoaming device, air is separated from surplus fuel containing fine bubbles returned from the delivery pipe to the fuel tank, and only the fuel is returned to the fuel tank.
However, as in Patent Document 1, when a defoaming device that separates fine bubbles in surplus fuel is provided, there is a problem that energy consumed in the defoaming device is large and fuel consumption is deteriorated. Further, the provision of the defoaming device has a problem that the number of parts and the cost increase.
The present invention has been made in view of the above-described problems, and an object thereof is to provide a fuel injection device capable of mixing fine bubbles into fuel with a simple configuration.

  The fuel injection device according to claim 1 includes a fuel injection valve, a delivery pipe, a fuel tank, a fuel passage member, a fuel pump, an evaporated fuel storage member, an inflow passage member, a gas supply passage member, A fine bubble mixing means, a return passage member, and a relief valve are provided. The fuel injection valve injects fuel into the internal combustion engine. The delivery pipe distributes fuel to the fuel injection valve. The fuel tank stores fuel supplied to the fuel injection valve. The fuel passage member has a fuel passage that communicates the fuel tank and the delivery pipe. The fuel pump supplies the fuel stored in the fuel tank together with the gas to the fuel injection valve via the fuel passage. The evaporated fuel storage member stores a gas containing evaporated fuel in which the fuel in the fuel tank has evaporated. The inflow passage member has an inflow passage that is connected to the evaporated fuel storage member and supplies gas to the evaporated fuel storage member. The gas supply passage member has a gas supply passage for supplying the fuel pump with the gas containing the evaporated fuel stored in the evaporated fuel storage member and the gas supplied to the evaporated fuel storage member via the inflow passage. The fine bubble mixing means is provided in the fuel passage and finely mixes the gas supplied together with the fuel by the fuel pump into the fuel. The return passage member has a return passage for returning the fuel in the delivery pipe to the fuel tank. The relief valve switches between communication and disconnection between the delivery pipe and the return passage.

In the present invention, since the fuel in which the fine bubbles are mixed is injected from the fuel injection valve, atomization of the spray can be promoted. Thereby, combustion efficiency can be improved. In addition, when the degassing device is not provided in the return passage, fine bubbles are included in the fuel returned to the fuel tank via the return passage. The gas mixed as fine bubbles in the fuel returned to the fuel tank rises to the vicinity of the liquid surface over time and aggregates, and then defoamed and separated from the liquid fuel. The gas separated from the liquid fuel is stored in the evaporative fuel storage member together with the evaporative fuel, and then supplied to the fuel pump via the gas supply passage and mixed again in the fuel. In this way, the evaporative fuel storage member serves both for the supply of gas into the fuel and the recovery and reuse of the evaporative fuel, eliminating the need for a defoaming device and mixing fine bubbles in the fuel with a simple configuration. can do.
In the present invention, the “gas” may be any gas that can be returned to the fuel tank together with the fuel.

  The invention according to claim 2 further includes a bypass passage member connected to the gas supply passage member and having a bypass passage for supplying gas to the gas supply passage without going through the evaporated fuel storage member. By supplying the gas via the bypass passage without passing through the evaporated fuel storage member, the gas supply amount can be increased.

  According to a third aspect of the present invention, there is further provided a switching valve that is provided in the inflow passage and switches between permitting or prohibiting the inflow of gas to the evaporated fuel storage member via the inflow passage. Thereby, the quantity of the gas supplied to the gas supply passage via the evaporated fuel storage member can be made variable. For example, by adopting the configuration of claim 2 and switching the switching valve so as to prohibit the inflow of gas to the evaporated fuel supply member based on the operating state, and supplying the gas to the gas supply passage via the bypass passage The amount of gas supply can be increased.

  Further, for example, when the configuration according to claim 4 is adopted and the evaporated fuel stored in the evaporated fuel storage member becomes larger than a predetermined value, the gas is allowed to flow into the evaporated fuel storage member via the inflow passage. If the switching valve is switched as described above, it is possible to efficiently supply the gas into the fuel and collect and reuse the evaporated fuel.

  The invention according to claim 5 further includes a high-pressure pump provided between the fine bubble mixing portion and the delivery pipe. Thereby, the fuel mixed with fine bubbles can be pressurized and supplied to the delivery pipe.

  According to a sixth aspect of the present invention, the gas supply control valve further includes a gas supply control valve that is provided in the gas supply passage and switches between permitting or prohibiting the inflow of gas to the fuel pump. Then, the relief valve is opened for a predetermined period after the internal combustion engine is stopped, and the fuel pump is continuously driven with the gas supply control valve switched so that the gas supply passage is blocked and no gas is supplied to the fuel pump. To do. Note that the predetermined period of time during which the pump is continuously driven with the relief valve opened and the gas supply passage shut off is based on the capacity of the fuel passage and the delivery pipe and the discharge amount of the fuel pump. It is set to a period required for fuel containing fine bubbles to be returned to the fuel tank. Thereby, since the fuel containing gas does not remain in the fuel passage and the delivery pipe, it is possible to avoid the shortage of the fuel injection amount due to the injection of the agglomerated gas together with the fuel when the engine is restarted.

It is a schematic block diagram which shows the structure of the fuel-injection apparatus by 1st Embodiment of this invention. It is a flowchart explaining the switching valve control process by 1st Embodiment of this invention. It is a flowchart explaining the gas supply control process at the time of the engine stop by 1st Embodiment of this invention. It is a schematic block diagram which shows the structure of the fuel-injection apparatus by 2nd Embodiment of this invention. It is a schematic block diagram which shows the structure of the fuel-injection apparatus by 3rd Embodiment of this invention.

A fuel injection device according to the present invention will be described below with reference to the drawings.
(First embodiment)
A fuel injection device according to a first embodiment of the present invention is shown in FIG. The fuel injection device 1 injects fuel into an engine as an internal combustion engine (not shown). The fuel injection device 1 of this embodiment is applied to a port injection type engine. The fuel injection device 1 includes a fuel tank 10, a canister 17 as an evaporative fuel storage member, an inflow passage member 21, a gas supply passage member 24, a fuel pump 40, a fuel passage member 44, and a fine bubble mixer 50 as a fine bubble mixing means. A delivery pipe 60, an injector 61 as a fuel injection valve, a return passage member 64, a relief valve 67, an electronic control unit (hereinafter referred to as "ECU") 70, and the like.

Liquid fuel is stored in the fuel tank 10. The fuel in this embodiment is gasoline. In the fuel tank 10, the upper space 11 on the liquid level of the liquid fuel is filled with the evaporated fuel in which a part of the fuel is evaporated.
The upper space 11 communicates with the canister 17 via a canister passage 14 formed in the canister passage member 13. As a result, the gas containing the evaporated fuel is supplied to the canister 17 from the fuel tank 10 via the canister passage 14. The canister 17 has an adsorbing member such as activated carbon, and adsorbs and stores the evaporated fuel supplied from the fuel tank 10 via the canister passage 14 by the adsorbing member.

  The inflow passage member 21 has an inflow passage 22 that supplies gas to the canister 17. The end of the inflow passage 22 opposite to the canister 17 opens into an engine room (not shown). As a result, gas flows into the canister 17 via the inflow passage 22. In the present embodiment, the gas flowing into the inflow passage 22 and a bypass passage 32 described later is air.

  A gas supply passage member 24 having a gas supply passage 25 is provided between the canister 17 and the suction port of the fuel pump 40. The gas from the canister 17 and the bypass passage 32 flows into the gas supply passage 25, and the gas that has flowed into the gas supply passage 25 is supplied to the fuel pump 40. The gas flowing from the canister 17 into the gas supply passage 25 contains evaporated fuel.

  A gas supply control valve 27 is provided in the gas supply passage 25. The gas supply control valve 27 switches between permitting or prohibiting the inflow of gas to the fuel pump 40. In this embodiment, it is an on-off valve that switches between opening and closing of the gas supply passage 25. When the gas supply control valve 27 is open, inflow of gas to the fuel pump 40 side is allowed. On the other hand, when the gas supply control valve 27 is closed, the inflow of gas to the fuel pump 40 side is prohibited.

  The bypass passage member 31 has one end connected to the inflow passage member 21 and the other end connected to the gas supply passage member 24. The bypass passage member 31 is formed with a bypass passage 32 that supplies gas to the gas supply passage 25 without going through the canister 17. A switching valve 35 is provided at a connection portion between the inflow passage 22 and the bypass passage 32. The switching valve 35 of this embodiment is a three-way valve. By driving the switching valve 35, a gas containing evaporated fuel is supplied to the gas supply passage 25 via the canister 17, or evaporates to the gas supply passage 25 via the bypass passage 32 without passing through the canister 17. Switch between supplying gas without fuel. In the present embodiment, the switching valve 35 is normally configured to supply gas to the gas supply passage 25 via the bypass passage 32 during engine operation.

  The fuel pump 40 is an in-tank pump provided in the fuel tank 10. A suction passage member 41 is connected to the suction port of the fuel pump 40, and fuel in the fuel tank 10 is sucked into the fuel pump 40 via a suction passage 42 formed in the suction passage member 41. Further, the suction passage 42 and the gas supply passage 25 are in communication with each other, whereby the gas from the gas supply passage 25 and the fuel from the fuel tank 10 flow into the suction passage 42. The discharge port of the fuel pump 40 is connected to a fuel passage member 44 having a fuel passage 45 communicating with the delivery pipe 60. Accordingly, the fuel pump 40 sucks fuel and gas through the suction passage 42 and discharges the fuel and gas to the fuel passage 45. Note that the evaporated fuel in the gas supplied via the gas supply passage 25 is liquefied when being pumped by the fuel pump 40. Therefore, the fluid discharged by the fuel pump 40 includes a liquid fuel and a gas that does not dissolve in the liquid fuel.

  The fuel passage 45 is provided with a fine bubble mixer 50 that refines the gas supplied together with the fuel by the fuel pump 40 and mixes it with the fuel. For example, microvalves of several μm to several tens of μm are known as fine bubbles which are miniaturized gases. The fine bubble mixer 50 may be any device as long as the gas supplied together with the fuel can be refined and mixed in the fuel. For example, a shearing force is generated by generating a swirling flow to cut the gas. The gas is refined by pulverization. Further, for example, the gas is refined by increasing the flow rate from the state in which the fuel containing the gas is pressurized and the gas is dissolved in the fuel to cause cavitation. Further, the gas may be refined by ultrasonic waves.

  The delivery pipe 60 is supplied with fuel containing fine bubbles refined by the fine bubble mixer 50. The fuel containing fine bubbles supplied to the delivery pipe 60 is distributed to a plurality of injectors 61. The injector 61 injects fuel in which fine bubbles are mixed into an intake port (not shown) communicating with the fuel chamber of the engine. Thereby, the fuel injected from the injector 61 is atomized, and the combustion efficiency is improved.

  The return passage member 64 has a return passage 65 that returns excess fuel in the delivery pipe 60 to the fuel tank 10. The return passage 65 communicates with the delivery pipe 60 via the relief valve 67.

  The relief valve 67 is provided on the end side of the delivery pipe 60. The relief valve 67 opens when the fuel pressure in the delivery pipe 60 exceeds the set pressure. As a result, surplus fuel in the delivery pipe 60 is returned to the fuel tank 10 via the return passage 65. In the present embodiment, the return passage 65 is not provided with a defoaming device. Therefore, the fuel containing fine bubbles that are refined and mixed in the fuel is returned to the fuel tank 10 via the return passage 65.

  The ECU 70 controls the entire fuel injection device 1. The gas supply control valve 27, the switching valve 35, the fuel pump 40, the fine bubble mixer 50, the injector 61, the relief valve 67, and the like are connected to the output side of the ECU 70. Further, a crank angle sensor, an accelerator opening sensor, an air-fuel ratio sensor, and the like are connected to the input side of the ECU 70. In FIG. 1, the control lines other than the control line to the fine bubble mixer 50 are omitted to avoid complication.

In the present embodiment, whether the switching valve 35 supplies gas containing evaporated fuel via the canister 17 or supplies gas not including evaporated fuel via the bypass passage 32 without passing through the canister 17. Is switched.
Therefore, the switching valve control process for controlling the driving of the switching valve 35 will be described based on the flowchart shown in FIG. This process is executed at predetermined intervals during engine operation.

  In the first step S101 (hereinafter, “step” is omitted and is simply indicated by the symbol “S”), the switching valve 35 is switched so that the inhaled air passes through the bypass passage 32. When the gas is supplied through the bypass passage 32, the state is continued.

  In S102, an estimated fuel amount V that is the amount of evaporated fuel stored in the canister 17 is estimated. The estimated fuel amount V is determined based on an elapsed time after switching the switching valve 35 to a state where gas is supplied via the bypass passage 32 after a state where gas is supplied via the canister 17 and a valve opening time of the relief valve 67. Is estimated by referring to a map stored in advance. The estimated fuel amount V is determined based on the elapsed time after switching the switching valve 35 to the state in which the gas is supplied through the bypass passage 32 after the state in which the gas is supplied through the canister 17 and the opening of the relief valve 67. You may calculate by calculation based on valve time.

  In S103, it is determined whether the estimated fuel amount V stored in the canister 17 is greater than a predetermined value V1. When it is determined that the estimated fuel amount V is equal to or less than the predetermined value V1 (S103: NO), the process returns to S102. When it is determined that the estimated fuel amount V is larger than the predetermined value V1 (S103: YES), the process proceeds to S104.

  In S <b> 104, the switching valve 35 is switched so that the sucked air passes through the canister 17. At this time, since the sucked air passes through the canister 17, the gas containing the evaporated fuel stored in the canister 17 is sent to the fuel pump 40 through the gas supply passage 25 to process the evaporated fuel. Further, here, the time Tx after the switching valve 35 is switched so that the sucked air passes through the canister 17 is counted.

In S105, it is determined whether or not a time Tx after switching the switching valve 35 so that the sucked air passes through the canister 17 exceeds a predetermined time T1. The predetermined time T1 is set in advance based on the capacity of the canister 17 and the suction characteristics of the fuel pump 40. When it is determined that the time Tx after switching the switching valve 35 so that the inhaled air passes through the canister 17 is equal to or less than the predetermined time T1 (S105: NO), this determination process is repeated. When it is determined that the time Tx after switching the switching valve 35 so that the inhaled air passes through the canister 17 exceeds the predetermined time T1 (S105: YES), the process proceeds to S106.
In S106, the switching valve 35 is switched so that the sucked air passes through the bypass passage 32, and the present process is terminated.

Next, the gas supply control process when the engine is stopped will be described based on the flowchart shown in FIG. This process is executed when an engine stop command is acquired.
In the first S121, an engine stop command is acquired.
In S122, the fuel injection from the injector 61 is stopped.
In S123, the engine is stopped. At this time, the fuel injection from the injector 61 and the engine are stopped, but the drive of the fuel pump 40 is continued.

In S124, the gas supply control valve 27 is closed. Thereby, supply of the gas to the fuel pump 40 is stopped. Therefore, fuel that does not contain gas is discharged from the fuel pump 40.
In S125, the relief valve 67 is opened. Thereby, the fuel containing the fine bubbles in the delivery pipe 60 is returned to the fuel tank 10 via the return passage 65. Here, the time Ty after the relief valve 67 is opened is counted.

In S126, it is determined whether or not a time Ty after the relief valve 67 is opened exceeds a predetermined time T2. The predetermined time T2 is set to a time that does not leave fuel containing fine bubbles in the delivery pipe 60 and the fuel passage 45 based on the volume from the fuel pump 40 to the delivery pipe 60, the discharge performance of the fuel pump 40, and the like. . When it is determined that the time Ty after the relief valve 67 is opened is equal to or less than the predetermined time T2 (S126: NO), this determination process is repeated. When it is determined that the time Ty after the relief valve 67 is opened exceeds the predetermined time T2 (S126: YES), the process proceeds to S127.
In S127, the relief valve 67 is closed.
In S128, the driving of the fuel pump 40 is stopped and the present process is terminated.

Here, the operation of the fuel injection device 1 will be described.
When the evaporated fuel stored in the canister 17 is equal to or lower than the predetermined value V1 (S103 in FIG. 2: YES), the switching valve 35 is configured so that the gas supplied to the gas supply passage 25 does not pass through the canister 17 and bypass passage 32. Is going to go through. The gas supplied via the bypass passage 32 and the gas supply passage 25 joins the fuel in the suction passage 42 and is sucked into the fuel pump 40 together with the fuel. The fuel containing the gas sucked into the fuel pump 40 is discharged into the fuel passage 45.

  When the evaporated fuel stored in the canister 17 exceeds the predetermined value V1 (S103 in FIG. 2: YES), the switching valve 35 is switched so that the gas supplied to the gas supply passage 25 passes through the canister 17 (S104). ). At this time, the gas containing the evaporated fuel stored in the canister 17 via the canister passage 14 and the gas flowing in via the suction passage 42 are supplied to the fuel pump 40 via the gas supply passage 25. The The evaporated fuel contained in the gas supplied to the fuel pump 40 is liquefied by the discharge pressure.

  The fuel containing the gas discharged into the fuel passage 45 is refined by the fine bubble mixer 50 and mixed into the fuel. The fuel containing fine bubbles in which the gas is refined is supplied to the delivery pipe 60 and injected from the injector 61. Since fine bubbles are mixed in the fuel injected from the injector 61, atomization of the spray is promoted. Thereby, combustion efficiency improves.

  Excess fuel in the delivery pipe 60 is returned to the fuel tank 10 via the return passage 65 when the relief valve 67 is opened. In the present embodiment, fuel containing fine bubbles is returned to the fuel tank 10. When the fuel is returned to the fuel tank 10 in a state including the fine bubbles, the fine bubbles in the fuel rise with time to the vicinity of the liquid level of the fuel, aggregate and disappear, and the gas is released into the upper space 11. . The released gas is supplied to the canister 17 through the canister passage 14 together with the evaporated fuel. This gas is again supplied to the fuel pump 40 via the gas supply passage 25, and is refined by the fine bubble mixer 50 and mixed into the fuel. In other words, it can be said that the fuel tank 10, the canister passage 14, and the canister 17 function as a defoaming device. Further, the gas containing the evaporated fuel from the canister passage 14 and the gas from the inflow passage 22 supply the gas containing the evaporated fuel to the fuel pump 40 via the canister 17 and the gas supply passage 25, thereby It can be said that it combines processing, reuse, and gas supply.

  When an engine stop command is issued (S121 in FIG. 3), fuel injection from the injector 61 is stopped and the engine is stopped (S122, S123). At this time, the fuel pump 40 continues to drive. Further, the gas supply control valve 27 is closed, and the supply of gas to the fuel pump 40 is stopped (S124). As a result, fuel that does not contain gas is supplied to the delivery pipe 60 by the fuel pump 40. Further, since the relief valve 67 provided on the terminal side of the delivery pipe 60 is opened (S125), the fuel containing fine bubbles is returned to the fuel tank 10 via the relief valve 67 and the return passage 65. After there is no fuel containing fine bubbles in the delivery pipe 60 and the delivery pipe 60 is filled with fuel containing no fine bubbles (S126: YES), the relief valve 67 is closed (S127). The drive is stopped (S128). If fuel containing fine bubbles remains in the delivery pipe 60, the fine bubbles in the fuel may be aggregated into a large lump while the engine is stopped, which may reduce the injection amount at the time of restart or make it impossible to start. is there. In this embodiment, since the fuel pump 40 is stopped after the fuel containing fine bubbles in the delivery pipe 60 is returned to the fuel tank 10, the fuel containing fine bubbles does not remain in the delivery pipe 60. Thus, it is possible to avoid the fact that the air agglomerated together with the fuel is injected at the time of restart of the engine and the injection amount of the fuel is insufficient or the startability is deteriorated.

  As described above in detail, the injector 61 injects the fuel distributed by the delivery pipe 60 into the engine. The fuel tank 10 stores the fuel supplied to the injector 61. The fuel passage member 44 has a fuel passage 45 that allows the fuel tank 10 and the delivery pipe 60 to communicate with each other. The fuel pump 40 supplies the fuel stored in the fuel tank 10 to the injector 61 through the fuel passage 45 together with the gas. The canister 17 stores a gas containing evaporated fuel obtained by evaporating the fuel in the fuel tank 10. The inflow passage member 21 has an inflow passage 22 that is connected to the canister 17 and supplies gas to the canister 17. The gas supply passage member 24 has a gas supply passage 25 that supplies the fuel pump 40 with the gas containing the evaporated fuel stored in the canister 17 and the gas supplied to the canister 17 via the inflow passage 22. The fine bubble mixer 50 is provided in the fuel passage 45 and finely mixes the gas supplied together with the fuel by the fuel pump 40 into the fuel. The return passage member 64 has a return passage 65 that returns the fuel in the delivery pipe 60 to the fuel tank 10. The relief valve 67 switches communication and blocking between the delivery pipe 60 and the return passage 65.

Thereby, the following effects are produced.
(1) In this embodiment, since the fuel in which the fine bubbles are mixed is injected from the injector 61, atomization of the spray can be promoted. Thereby, combustion efficiency can be improved. In the present embodiment, since the return passage 65 is not provided with a defoaming device, the fuel returned to the fuel tank 10 via the return passage 65 contains fine bubbles. The gas mixed as fine bubbles in the fuel returned to the fuel tank 10 rises near the liquid surface over time and aggregates, then defoamed and separated from the liquid fuel. The gas separated from the liquid fuel is supplied together with the evaporated fuel to the canister 17 via the canister passage 14, supplied to the fuel pump 40 via the gas supply passage 25, and mixed with the fuel again. In this way, since the canister 17 serves both for the supply of gas into the fuel and for the recovery and reuse of the evaporated fuel, no defoaming device is required, and fine bubbles can be mixed in the fuel with a simple configuration. Can do.

  (2) Further, a bypass passage member 31 that is connected to the gas supply passage member 24 and has a bypass passage 32 that supplies gas to the gas supply passage 25 without going through the canister 17 is provided. By supplying gas via the bypass passage 32, the amount of gas supply can be increased.

  (3) Furthermore, a switching valve 35 is provided in the inflow passage 22 and switches between permitting or prohibiting the inflow of gas to the canister 17 via the inflow passage 22. Thereby, the amount of gas supplied to the gas supply passage 25 via the canister 17 can be made variable. For example, the gas supply amount is increased by switching the switching valve 35 so as to prohibit the inflow of gas into the canister 17 based on the operating state and supplying the gas to the gas supply passage 25 via the bypass passage 32. Can do.

  (4) In this embodiment, when the estimated fuel amount V of the evaporated fuel stored in the canister 17 becomes larger than the predetermined value V1 (S103: YES), gas flows into the canister 17 via the inflow passage 22. Since the switching valve 35 is switched so as to allow this (S104), the supply of gas into the fuel and the recovery and reuse of the evaporated fuel can be performed efficiently.

  (5) In this embodiment, the gas supply passage 25 is provided with a gas supply control valve 27 that switches between permitting or prohibiting the inflow of gas to the fuel pump 40. The fuel pump is opened in a state where the relief valve 67 is opened for a predetermined period after the engine is stopped and the gas supply control valve 27 is switched so that the gas supply passage 25 is shut off and the gas is not supplied to the fuel pump 40. 40 is continued (S124, S125). In this state, the drive of the fuel pump 40 is continued for a period required for the fuel containing the fine bubbles in the fuel passage 45 and the delivery pipe 60 to be returned to the fuel tank 10. Thereby, since the fuel containing gas does not remain in the fuel passage 45 and the delivery pipe 60, it is possible to avoid the shortage of the fuel injection amount due to the injection of the gas condensed together with the fuel when the engine is restarted. .

The second embodiment of the present invention will be described below with reference to FIG. 4 and the third embodiment with reference to FIG. Hereinafter, in a plurality of embodiments, substantially the same configuration is denoted by the same reference numeral, and description thereof is omitted.
(Second Embodiment)
As shown in FIG. 4, the fuel injection device 2 according to the second embodiment is applied to a gasoline direct injection engine or a diesel engine. The fuel injection device 2 includes a high-pressure pump 80 between the fine bubble mixer 50 and the delivery pipe 60. Thus, in addition to the same effects as the above embodiment, the fuel containing fine bubbles can be pressurized to a predetermined pressure and fuel containing fine bubbles can be supplied to the delivery pipe 60.

(Third embodiment)
As shown in FIG. 5, the fuel injection device 3 according to the third embodiment does not include the bypass passage member 31 having the bypass passage 32 and the switching valve 35 in the above embodiment. Also in this embodiment, since the canister 17 serves both for the supply of gas into the fuel and for the recovery and reuse of the evaporated fuel, the fine bubbles can be mixed into the fuel with a simpler configuration. The same effects as (1) and (5) are obtained.

(Other embodiments)
In the above embodiment, four injectors are illustrated, but in other embodiments, the number of cylinders is not limited to four, and may be six cylinders or the like.
Moreover, in the said embodiment, although the gas supplied in a fuel was air, in other embodiment, if it is a gas which can be returned in a fuel tank, other gases, such as nitrogen, may be sufficient, for example.

In the first embodiment and the second embodiment, the switching valve 35 is a three-way valve provided at the connection portion between the inflow passage 22 and the bypass passage 32. In another embodiment, the switching valve may be provided on the canister side in the inflow passage with respect to the connection portion with the bypass passage. In this case, the switching valve may be an on-off valve that switches communication and blocking of the inflow passage.
Furthermore, the bypass passage may be configured not to be connected to the inflow passage but to supply gas directly to the gas supply passage.

In the above embodiment, the gas supply passage is configured to supply gas to the fuel pump via the suction passage. In another embodiment, the gas supply passage may be connected to the fuel pump, and the gas may be supplied directly to the fuel pump without going through the suction passage. In the above embodiment, the fuel pump is provided in the fuel tank. However, in another embodiment, the fuel pump may be provided outside the fuel tank.
As mentioned above, this invention is not limited to the said embodiment at all, In the range which does not deviate from the meaning of invention, it can implement with a various form.

1, 2, 3 ... Fuel injection device
10 ... Fuel tank
17 ... canister (evaporative fuel storage member)
21 ... Inflow passage member
22 ... Inflow passage
24 ... Gas supply passage member
25 ... Gas supply passage
27 ... Gas supply control valve
31 ... Bypass passage member
32 ... Bypass passage
35 ... Switching valve
40 ... Fuel pump
44 ... Fuel passage member
45 ... Fuel passage
50 ... Fine bubble mixer (fine bubble mixing means)
60 ... Delivery pipe
61 ... Injector (fuel injection valve)
64 ... Return passage member
65 ... Return passage
67 ... Relief valve
70 ... ECU
80 ... High pressure pump

Claims (6)

A fuel injection valve for injecting fuel into the internal combustion engine;
A delivery pipe for distributing fuel to the fuel injection valve;
A fuel tank for storing fuel supplied to the fuel injection valve;
A fuel passage member having a fuel passage communicating the fuel tank and the delivery pipe;
A fuel pump for supplying the fuel stored in the fuel tank to the fuel injection valve together with gas via the fuel passage and the delivery pipe;
An evaporative fuel storage member for storing a gas containing evaporative fuel in which the fuel in the fuel tank is evaporated;
An inflow passage member connected to the evaporative fuel storage member and having an inflow passage for supplying gas to the evaporative fuel storage member;
A gas supply passage member having a gas supply passage for supplying the fuel pump with a gas containing the evaporated fuel stored in the evaporated fuel storage member and a gas supplied to the evaporated fuel storage member via the inflow passage; ,
A fine bubble mixing means that is provided in the fuel passage and finely mixes the gas supplied together with the fuel by the fuel pump into the fuel;
A return passage member having a return passage for returning the fuel in the delivery pipe to the fuel tank;
A relief valve for switching communication and blocking between the delivery pipe and the return passage;
A fuel injection device comprising:   2. The fuel according to claim 1, further comprising a bypass passage member connected to the gas supply passage member and having a bypass passage for supplying gas to the gas supply passage without passing through the evaporated fuel storage member. Injection device.   3. The fuel injection device according to claim 1, further comprising a switching valve that is provided in the inflow passage and switches between permitting or prohibiting the inflow of gas to the evaporated fuel storage member via the inflow passage. .   The switching valve is switched to allow gas to flow into the evaporated fuel storage member via the inflow passage when the evaporated fuel stored in the evaporated fuel storage member becomes larger than a predetermined value. The fuel injection device according to claim 3.   The fuel injection device according to any one of claims 1 to 4, further comprising a high-pressure pump provided between the fine bubble mixing means and the delivery pipe. A gas supply control valve that is provided in the gas supply passage and switches between permitting or prohibiting the inflow of gas to the fuel pump;
The fuel pump is opened in a state in which the relief valve is opened for a predetermined period after the internal combustion engine is stopped and the gas supply control valve is switched so that the gas supply passage is blocked and no gas is supplied to the fuel pump. The fuel injection device according to any one of claims 1 to 5, wherein the driving is continued.

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