JP7449120B2 - fuel storage device - Google Patents

Description

The present invention relates to a fuel storage device. More specifically, the present invention relates to a fuel storage device that stores fuel containing olefinic hydrocarbons in a predetermined proportion or more.

BACKGROUND ART In recent years, as an alternative to fossil fuels, synthetic fuels made from hydrogen produced by electricity generated by renewable energy and carbon sources such as biomass and carbon dioxide emitted from factories have been attracting attention.

Unlike fuels produced from petroleum, synthetic fuels are difficult to selectively produce substances with a high octane number, so ensuring a high octane number is an issue. Olefinic hydrocarbons have the advantage of having a higher octane number than paraffinic hydrocarbons, so in this respect they can be said to be suitable for synthetic fuels.

However, olefinic hydrocarbons have the disadvantage that they easily oxidize and turn into gummy substances when exposed to air. Therefore, when synthetic fuel containing olefinic hydrocarbons in a predetermined proportion or more is used as a fuel for an internal combustion engine, it is necessary to prevent the fuel from deteriorating in quality on the vehicle.

Japanese Patent Application Publication No. 2009-133280

For example, Patent Document 1 discloses an invention related to a fuel supply device that suppresses oxidative deterioration of biogas oil. Bio-gas oil is characterized by being more susceptible to oxidative deterioration under high-temperature conditions than standard diesel oil. Therefore, this fuel supply device suppresses oxidative deterioration of the fuel by supplying air into the fuel tank and cooling the fuel in the fuel tank when the temperature inside the fuel tank becomes higher than the atmospheric temperature by a predetermined temperature. are doing.

However, as mentioned above, the olefinic hydrocarbons contained in the synthetic fuel deteriorate into a gummy substance when exposed to air, so the technique disclosed in Patent Document 1 cannot be used to suppress the deterioration of the synthetic fuel.

An object of the present invention is to provide a fuel storage device that can suppress deterioration of fuel containing olefinic hydrocarbons in a predetermined proportion or more.

(1) The fuel storage device according to the present invention (for example, the fuel storage device 2 described below) stores fuel to be supplied to an internal combustion engine (for example, the engine 1 described below), and contains olefin at a predetermined ratio or more. A fuel tank (for example, fuel tank 3 described later) that stores fuel containing hydrocarbons, and a part of the exhaust gas of the internal combustion engine is supplied as an inert gas into the fuel tank, It is characterized by comprising an inert gas filling device (for example, an inert gas filling device 6 described below) that seals gas.

(2) In this case, the fuel storage device further includes a refueling detection means (for example, a sender unit 5, a control device 7, etc. to be described later) that detects that fuel has been refilled into the fuel tank, and the inert It is preferable that the gas filling device fills inert gas into the fuel tank in response to detection of refueling by the refueling detection means.

(3) In this case, the inert gas filling device connects the exhaust gas passage of the internal combustion engine (for example, the exhaust pipe 13 described below) and the fuel tank (for example, the inert gas introduction pipe 61), an exhaust gas chamber (e.g., exhaust gas chamber 62 described below) provided in the inert gas passage, and a first valve (1) provided in the inert gas passage closer to the fuel tank than the exhaust gas chamber. For example, it is preferable to include a first electromagnetic valve 63 (to be described later) and a control device (for example, a control device 7 to be described below) that opens and closes the first valve.

(4) In this case, it is preferable that the control device supplies the exhaust gas in the exhaust gas chamber into the fuel tank by opening the first valve while the internal pressure of the exhaust gas chamber is higher than atmospheric pressure.

(5) In this case, a second valve (for example, a second electromagnetic valve 64 to be described later) is provided in the inert gas passage on the exhaust gas passage side from the exhaust gas chamber, and the control device controls the first valve. It is preferable to close the exhaust gas chamber and close the second valve to supply exhaust gas into the exhaust gas chamber, and then close the second valve to seal the exhaust gas into the exhaust gas chamber.

(6) In this case, a compressor may be provided in the inert gas passage closer to the exhaust gas passage than the exhaust gas chamber, compressing the exhaust gas flowing through the inert gas passage and supplying it to the exhaust gas chamber. preferable.

(7) In this case, it is preferable that the inert gas passage or the exhaust gas chamber is provided with a water trap (for example, the water trap 66 described below) that captures water in the exhaust gas.

(8) In this case, the fuel storage device includes a canister (for example, a canister 42 described below) connected to the fuel tank via a charge pipe (for example, a charge pipe 41 described below), and a canister provided in the charge pipe. The fuel tank preferably includes a one-way valve (for example, one-way valve 45 described below), and the one-way valve opens when the internal pressure of the fuel tank becomes higher than a predetermined pressure.

(1) The fuel storage device according to the present invention includes a fuel tank that stores fuel containing olefinic hydrocarbons at a predetermined ratio or more, and a part of the exhaust gas discharged from an internal combustion engine by supplying the fuel in the fuel tank. and an inert gas filling device that supplies the fuel as an inert gas into the fuel tank and fills the fuel tank with the inert gas. According to the present invention, by sealing the exhaust gas in the fuel tank as an inert gas, it is possible to suppress the fuel in the fuel tank from coming into contact with oxygen at the liquid level, thereby preventing the deterioration of olefinic hydrocarbons in the fuel. Can be suppressed. Further, in the present invention, by using the exhaust gas of the internal combustion engine as the inert gas, there is no need to separately provide a tank for storing the inert gas, so the configuration of the fuel storage device can be simplified.

(2) When the cap provided on the fuel filler port is opened when filling the fuel tank with fuel, a considerable amount of air flows into the fuel tank. Therefore, in the fuel storage device according to the present invention, inert gas is sealed in the fuel tank in response to the fact that the fuel supply detection means detects that fuel has been supplied. Thereby, the air that has flowed into the fuel tank during refueling can be replaced with inert gas, so that deterioration of the olefinic hydrocarbons in the fuel can be suppressed.

(3) The inert gas filling device includes an inert gas passage that connects the exhaust gas passage of the internal combustion engine and the fuel tank, an exhaust gas chamber provided in this passage, and a side of the inert gas passage that is closer to the fuel tank than the exhaust gas chamber. The device includes a first valve provided in the first valve, and a control device that opens and closes the first valve. According to the present invention, after a part of the exhaust gas discharged from the internal combustion engine is stored in the exhaust gas chamber, the exhaust gas in the exhaust gas chamber is released into the fuel tank at any time by opening the first valve as necessary. can be supplied. In addition, by storing a portion of the exhaust gas from an internal combustion engine in the exhaust gas chamber, time can be secured for the exhaust gas to cool down, and the cooled exhaust gas can then be sealed in the fuel tank as an inert gas. can.

(4) The control device supplies the exhaust gas in the exhaust gas chamber into the fuel tank by opening the first valve while the internal pressure of the exhaust gas chamber is higher than atmospheric pressure. Therefore, according to the present invention, exhaust gas can be supplied into the fuel tank using the differential pressure between the inside of the exhaust gas chamber and the inside of the fuel tank. As described above, in the present invention, by utilizing the differential pressure, there is no need to separately provide a pump for compressing the exhaust gas in the exhaust gas chamber and supplying it into the fuel tank, so the configuration of the fuel storage device can be simplified.

(5) In the present invention, a first valve and a second valve are provided before and after the exhaust gas chamber. Further, the control device supplies the exhaust gas into the exhaust gas chamber by closing the first valve and opening the second valve, and then seals the exhaust gas into the exhaust gas chamber by closing the second valve. Thereby, compressed exhaust gas can be sealed in the exhaust gas chamber using the exhaust pressure in the exhaust gas passage of the internal combustion engine.

(6) In the present invention, a compressor is provided in the inert gas passage on the exhaust gas passage side from the exhaust gas chamber to compress the exhaust gas and supply it to the exhaust gas chamber. Thereby, even when the exhaust pressure in the exhaust gas passage is not high enough, compressed exhaust gas can be sealed in the exhaust gas chamber.

(7) In the present invention, the inert gas passage or the exhaust gas chamber is provided with a water trap that captures water in the exhaust gas. This can prevent condensed water in the exhaust gas from entering the fuel tank.

(8) In the present invention, a one-way valve that opens when the internal pressure of the fuel tank becomes higher than a predetermined pressure is provided in the charge pipe that connects the fuel tank and the canister. This makes it possible to prevent outside air from flowing into the fuel tank through the canister while allowing the fuel vapor generated within the fuel tank to be adsorbed by the canister, thereby further suppressing deterioration of the olefinic hydrocarbons in the fuel.

1 is a diagram showing the configuration of an engine and its fuel storage device according to an embodiment of the present invention. It is a flowchart which shows the specific procedure of exhaust gas charge processing which seals exhaust gas in an exhaust gas chamber. It is a flowchart which shows the specific procedure of the inert gas filling process which seals the exhaust gas in an exhaust gas chamber into a fuel tank as an inert gas.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A fuel storage device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an internal combustion engine (hereinafter referred to as "engine") 1 and a fuel storage device 2 that stores its fuel. The fuel storage device 2 includes a fuel tank 3 for storing fuel to be supplied to the engine 1, and an inert gas filling device 6 for filling inert gas into the fuel tank 3.

In the fuel tank 3, liquid fuel containing olefin hydrocarbons in a predetermined proportion or more is stored. The fuel stored in the fuel tank 3 is manufactured using hydrogen generated from electricity generated by renewable energy such as wind and sunlight, and carbon sources such as biomass and carbon dioxide emitted from factories. Synthetic fuels are preferably used. Further, it is preferable that the content of olefinic hydrocarbons in this synthetic fuel is adjusted so that the octane number is equal to or higher than a predetermined value. New fuel can be supplied into the fuel tank 3 from the outside by opening a cap 32 provided at a fuel filler port 31.

The fuel tank 3 includes a fuel supply device 11 that supplies fuel stored in the fuel tank 3 to the engine 1, a fuel vapor processing device 4 that processes fuel vapor generated in the fuel tank 3, and a fuel tank 3. A sender unit 5 that detects the remaining amount of fuel stored therein is connected to an inert gas filling device 6, which will be described later.

The evaporative fuel processing device 4 includes a canister 42 connected to the fuel tank 3 via a charge pipe 41 , a purge pipe 43 connecting the canister 42 and the intake pipe 12 of the engine 1 , and a one-way system provided in the charge pipe 41 . A valve 45 is provided.

The one-way valve 45 opens when the internal pressure of the fuel tank 3 becomes higher than a predetermined pressure, and only allows flow from the fuel tank 3 side to the canister 42 side. The canister 42 includes an adsorbent (not shown) (specifically, activated carbon, for example) that adsorbs evaporated fuel. Evaporated fuel generated in the fuel tank 3 is supplied into the canister 42 via the charge pipe 41 and temporarily stored in the adsorbent. Further, the evaporated fuel adsorbed by the adsorbent flows into the intake pipe 12 by appropriately opening a purge control valve (not shown) provided in the purge pipe 43, and is used for combustion in the engine 1.

The sender unit 5 transmits a signal corresponding to the liquid level of the fuel stored in the fuel tank 3 to a control device 7 of the inert gas filling device 6, which will be described later. The remaining amount of fuel stored in the fuel tank 3 is acquired by the control device 7 based on a signal transmitted from the sender unit 5. The control device 7 determines that fuel has been filled into the fuel tank 3 if the remaining amount of fuel increases by a predetermined amount or more between before the ignition switch 9 is turned off and after the ignition switch 9 is turned on. judge. Therefore, in this embodiment, the refueling detection means for detecting that fuel has been refilled into the fuel tank 3 is constituted by the sender unit 5 and the control device 7, but the present invention is not limited to this.

The inert gas filling device 6 includes an inert gas introduction pipe 61 that connects the exhaust pipe 13 of the engine 1 and the fuel tank 3, an exhaust gas chamber 62 provided in the inert gas introduction pipe 61, and an inert gas introduction pipe 61 that connects the exhaust pipe 13 of the engine 1 and the fuel tank 3. A first electromagnetic valve 63 provided in the pipe 61 closer to the fuel tank 3 than the exhaust gas chamber 62; and a second electromagnetic valve 64 provided in the inert gas introduction pipe 61 closer to the exhaust pipe 13 than the exhaust gas chamber 62. and a control device 7 that operates the first electromagnetic valve 63 and the second electromagnetic valve 64.

The inert gas filling device 6 stores part of the exhaust gas from the engine 1 flowing through the exhaust pipe 13 in an inert gas introduction pipe 61 and an exhaust gas chamber 62, and opens the first electromagnetic valve 63 at a predetermined timing to fill the exhaust gas with the engine 1. Inert gas is sealed in the fuel tank 3 by supplying the exhaust gas stored in the active gas introduction pipe 61 and the exhaust gas chamber 62 into the fuel tank 3 as an inert gas. The exhaust gas generated when the engine 1 burns the fuel stored in the fuel tank 3 contains almost no oxygen and contains a large amount of nitrogen and carbon dioxide. It can be used as an inert gas to suppress oxidation.

The inert gas introduction pipe 61 is connected to an exhaust gas introduction part 15 provided in the exhaust pipe 13 on the downstream side of the catalyst purification device 14 that purifies exhaust gas, and in the fuel tank 3 in the vertical direction above the liquid level 33 of the fuel. This is piping that connects the inert gas introduction section 35 provided on the side.

The exhaust gas chamber 62 stores exhaust gas introduced from the exhaust gas introduction section 15 through the inert gas introduction pipe 61. The exhaust gas stored in the exhaust gas chamber 62 is cooled by outside air.

Further, the exhaust gas chamber 62 is provided with a water trap 66 that captures and discharges condensed water in the exhaust gas stored in the exhaust gas chamber 62. The water trap 66 includes a recess 661 provided at the bottom of the exhaust gas chamber 62 and a check valve 662 provided in the recess 661. That is, condensed water generated within the exhaust gas chamber 62 as the exhaust gas is cooled accumulates in the recess 661. Further, when a predetermined amount of condensed water accumulates in the recess 661, the weight of the condensed water opens the check valve 662, and the condensed water accumulated in the recess 661 is discharged.

The first electromagnetic valve 63 is provided closer to the fuel tank 3 than the exhaust gas chamber 62 in the inert gas introduction pipe 61 . When the first electromagnetic valve 63 is opened, the exhaust gas chamber 62 and the fuel tank 3 communicate with each other, and when the first electromagnetic valve 63 is closed, the communication between the exhaust gas chamber 62 and the fuel tank 3 is cut off. The first electromagnetic valve 63 opens and closes in response to a command signal from the control device 7.

The second electromagnetic valve 64 is provided in the inert gas introduction pipe 61 closer to the exhaust pipe 13 than the exhaust gas chamber 62 is. When the second electromagnetic valve 64 is opened, the exhaust pipe 13 and the exhaust gas chamber 62 communicate with each other, and when the second electromagnetic valve 64 is closed, the communication between the exhaust pipe 13 and the exhaust gas chamber 62 is cut off. The second electromagnetic valve 64 opens and closes in response to a command signal from the control device 7.

As described above, electromagnetic valves 63 and 64 are provided before and after the exhaust gas chamber 62. Therefore, by closing both of the electromagnetic valves 63 and 64 while the compressed exhaust gas is stored in the exhaust gas chamber 62, the compressed exhaust gas is sealed in the exhaust gas chamber 62. Further, after filling the exhaust gas chamber 62 with compressed exhaust gas, by keeping the electromagnetic valves 63 and 64 closed, the internal pressure of the exhaust gas chamber 62 is maintained at a state higher than atmospheric pressure.

Furthermore, when the first electromagnetic valve 63 is opened after the compressed exhaust gas is sealed in the exhaust gas chamber 62 as described above, the exhaust gas in the exhaust gas chamber 62 is , is supplied as an inert gas into the space between the liquid level 33 and the inner wall surface 34 in the fuel tank 3 via the inert gas introduction part 35. Further, the gas existing in the space between the liquid level 33 and the inner wall surface 34 in the fuel tank 3 is pushed out from the one-way valve 45 toward the canister 42 by the inert gas supplied from the inert gas introduction part 35. , replaced by an inert gas. As a result, the fuel tank 3 is filled with inert gas.

The control device 7 repeatedly performs an exhaust gas charging process (see FIG. 2) and an inert gas filling process (see FIG. 3), which will be described below, to fill the fuel tank 3 with inert gas. maintain the condition.

FIG. 2 is a flowchart showing a specific procedure for exhaust gas charging processing for sealing exhaust gas into the exhaust gas chamber 62. The process shown in FIG. 2 is carried out by the control device when the engine 1 is operating, that is, when the engine 1 is burning fuel supplied from the fuel tank 3 and when no exhaust gas is sealed in the exhaust gas chamber 62. 7 is executed at a predetermined cycle.

In S1, the control device 7 closes the first electromagnetic valve 63 and the second electromagnetic valve 64, and moves to S2.

In S2, the control device 7 determines whether or not the engine 1 has finished warming up. If the determination result in S2 is NO, the control device 7 ends the process shown in FIG. 2 while keeping the first electromagnetic valve 63 and the second electromagnetic valve 64 closed. The exhaust gas from the engine 1 before the warm-up is completed contains more impurities than the exhaust gas from the engine 1 after the warm-up is completed. For this reason, the control device 7 closes the second electromagnetic valve 64 when the warm-up of the engine 1 is not completed, and prevents the exhaust gas from the engine 1 before the warm-up is completed from being supplied into the exhaust gas chamber 62. If the determination result in S2 is YES, the process moves to S3.

In S3, the control device 7 determines whether the operating state of the engine 1 is within a predetermined operating range. Here, the predetermined operating range is an operating range in which the exhaust pressure in the exhaust pipe 13 is equal to or higher than a predetermined pressure, and is, for example, a high rotation and high load range. If the determination result in S3 is YES, the control device 7 moves to S4. If the determination result in S3 is NO, the control device 7 ends the process shown in FIG. 2 while keeping the second electromagnetic valve 64 closed. For this reason, the control device 7 closes the second electromagnetic valve 64 to prevent exhaust gas from being supplied into the exhaust gas chamber 62 when the exhaust pressure in the exhaust pipe 13 is less than a predetermined pressure.

In S4, the control device 7 supplies the exhaust gas compressed by the exhaust pressure into the exhaust gas chamber 62 by opening the second electromagnetic valve 64 for a predetermined time while keeping the first electromagnetic valve 63 closed.

In S5, the control device 7 closes the second electromagnetic valve 64 and fills the exhaust gas chamber 62 with exhaust gas compressed by exhaust pressure. As a result, the exhaust gas chamber 62 is filled with exhaust gas at an internal pressure higher than atmospheric pressure.

FIG. 3 is a flowchart showing a specific procedure for an inert gas filling process in which the exhaust gas in the exhaust gas chamber 62 is sealed into the fuel tank 3 as an inert gas. The process shown in FIG. 3 is executed at a predetermined cycle in the control device 7 when the exhaust gas chamber 62 is filled with exhaust gas having a pressure higher than atmospheric pressure by executing the exhaust gas charging process shown in FIG.

In S11, the control device 7 determines whether the fuel tank 3 has been filled with fuel. As described above, whether or not fuel has been supplied depends on whether the remaining amount of fuel has increased by a predetermined amount or more between before the ignition switch 9 is turned off and after the ignition switch 9 is turned on. can be determined. If the determination result in S11 is NO, the control device 7 ends the process shown in FIG. 3 while keeping the first electromagnetic valve 63 closed, and if the determination result in S11 is YES, it moves to S12. .

In S12, the control device 7 determines whether or not a predetermined cooling time has elapsed since the last time exhaust gas was sealed in the exhaust gas chamber 62. If the determination result in S12 is YES, the control device 7 moves to S13, and if the determination result in S12 is NO, it ends the process shown in FIG. 3 while keeping the first electromagnetic valve 63 closed. That is, if the cooling time has not elapsed since the exhaust gas was sealed in the exhaust gas chamber 62 and the temperature of the exhaust gas in the exhaust gas chamber 62 has not decreased to a predetermined temperature or lower, the control device 7 controls the first electromagnetic Opening of valve 63 is prohibited.

In S13, the control device 7 supplies the exhaust gas in the exhaust gas chamber 62 into the fuel tank 3 as an inert gas by opening the first electromagnetic valve 63 for a predetermined time while keeping the second electromagnetic valve 64 closed. As a result, air flowing into the fuel tank 3 from the fuel filler port 31 during refueling is replaced by exhaust gas supplied from the exhaust gas chamber 62.

In S14, the control device 7 closes the first electromagnetic valve 63 and ends the process shown in FIG. 3. As a result, the fuel tank 3 is filled with inert gas.

According to the fuel storage device 2 according to this embodiment, the following effects are achieved.
(1) The fuel storage device 2 includes a fuel tank 3 that stores fuel containing olefinic hydrocarbons at a predetermined ratio or more, and a fuel storage device 2 that stores a portion of the exhaust gas discharged from the engine 1 by supplying the fuel in the fuel tank 3. An inert gas filling device 6 is provided for supplying an inert gas into the fuel tank 3 and sealing the inert gas in the fuel tank 3. According to the fuel storage device 2, by sealing the exhaust gas in the fuel tank 3 as an inert gas, it is possible to suppress the fuel in the fuel tank 3 from coming into contact with oxygen at the liquid level 33. It is possible to suppress deterioration of hydrocarbons. Further, in the fuel storage device 2, by using the exhaust gas of the engine 1 as an inert gas, there is no need to separately provide a tank for storing inert gas, so the configuration of the fuel storage device 2 can be simplified.

(2) When the cap 32 provided on the fuel filler port is opened when filling the fuel tank 3 with fuel, a considerable amount of air flows into the fuel tank 3. Therefore, in the fuel storage device 2, an inert gas is sealed in the fuel tank 3 in response to detection of refueling. Thereby, the air that has flowed into the fuel tank 3 during refueling can be replaced with inert gas, so that deterioration of the olefinic hydrocarbons in the fuel can be suppressed.

(3) The inert gas filling device 6 includes an inert gas introduction pipe 61 that connects the exhaust pipe 13 and the fuel tank 3, an exhaust gas chamber 62 provided in the inert gas introduction pipe 61, and an inert gas introduction pipe 61 that connects the exhaust pipe 13 and the fuel tank 3. A first electromagnetic valve 63 provided in the pipe 61 on the side closer to the fuel tank 3 than the exhaust gas chamber 62 is provided, and a control device 7 for opening and closing the first electromagnetic valve 63. According to the fuel storage device 2, after a part of the exhaust gas discharged from the engine 1 is stored in the exhaust gas chamber 62, the amount of exhaust gas in the exhaust gas chamber 62 can be stored at any time by opening the first electromagnetic valve 63 as necessary. Exhaust gas can be supplied into the fuel tank 3. In addition, by storing a portion of the exhaust gas from the engine 1 in the exhaust gas chamber 62 in this manner, time for cooling the exhaust gas can be secured, and the cooled exhaust gas can be sealed in the fuel tank 3 as an inert gas. be able to.

(4) The control device 7 supplies the exhaust gas in the exhaust gas chamber 62 into the fuel tank 3 by opening the first electromagnetic valve 63 while the internal pressure of the exhaust gas chamber 62 is higher than atmospheric pressure. Therefore, according to the fuel storage device 2, exhaust gas can be supplied into the fuel tank 3 using the differential pressure between the exhaust gas chamber 62 and the fuel tank 3. In this way, the fuel storage device 2 utilizes the differential pressure, so there is no need to separately provide a pump for compressing the exhaust gas in the exhaust gas chamber 62 and supplying it to the fuel tank 3. can be simplified.

(5) In the fuel storage device 2, a first electromagnetic valve 63 and a second electromagnetic valve 64 are provided before and after the exhaust gas chamber 62. Further, the control device 7 supplies exhaust gas into the exhaust gas chamber 62 by closing the first electromagnetic valve 63 and opening the second electromagnetic valve 64, and then supplies the exhaust gas into the exhaust gas chamber 62 by closing the second electromagnetic valve 64. Encapsulate. Thereby, the exhaust gas compressed using the exhaust pressure in the exhaust pipe 13 can be sealed in the exhaust gas chamber 62.

(6) In the fuel storage device 2, the exhaust gas chamber 62 is provided with a water trap 66 that captures condensed water in the exhaust gas. Thereby, condensed water in the exhaust gas can be prevented from entering the fuel tank 3.

(7) In the fuel storage device 2, the charge pipe 41 connecting the fuel tank 3 and the canister 42 is provided with a one-way valve 45 that opens when the internal pressure of the fuel tank 3 becomes higher than a predetermined pressure. As a result, fuel vapor generated in the fuel tank 3 can be adsorbed into the canister 42 while preventing outside air from flowing into the fuel tank 3 through the canister 42, thereby preventing deterioration of olefinic hydrocarbons in the fuel. It can be further suppressed.

Although one embodiment of the present invention has been described above, the present invention is not limited to this. The detailed structure may be changed as appropriate within the spirit of the present invention.

For example, in the above embodiment, a case has been described in which compressed exhaust gas is supplied into the exhaust gas chamber 62 using the exhaust pressure in the exhaust pipe 13, but the present invention is not limited to this. In some cases, it may not be possible to supply sufficiently compressed exhaust gas using exhaust pressure alone. In such a case, the exhaust gas flowing through the inert gas introduction pipe 61 is compressed and transferred to the exhaust gas chamber 62 in response to a command from the control device 7, in the inert gas introduction pipe 61 closer to the exhaust pipe 13 than the exhaust gas chamber 62. A supply compressor may also be provided. By using such a compressor, compressed exhaust gas can be supplied into the exhaust gas chamber 62 even when the exhaust pressure in the exhaust pipe 13 is not sufficiently high.

Further, in the above embodiment, a case has been described in which the water trap 66 is provided at the bottom of the exhaust gas chamber 62, but the present invention is not limited to this. The water trap 66 may be provided in the inert gas introduction pipe 61 in addition to the exhaust gas chamber 62 .

Further, in the above embodiment, a case has been described in which the exhaust gas is cooled by outside air within the exhaust gas chamber 62, but the present invention is not limited to this. For example, a heat exchanger through which a refrigerant flows may be provided in the exhaust gas chamber 62 or on the side of the exhaust pipe 13 of the inert gas introduction pipe 61 rather than the exhaust gas chamber 62, and the exhaust gas may be cooled by this heat exchanger.

1...Engine 13...Exhaust pipe (exhaust gas passage)
2...Fuel storage device 3...Fuel tank 4...Evaporative fuel processing device 41...Charge pipe 42...Canister 45...One-way valve 5...Sender unit (refueling detection means)
6...Inert gas filling device 61...Inert gas introduction pipe (inert gas passage)
62...Exhaust gas chamber 63...First electromagnetic valve (first valve)
64...Second electromagnetic valve (second valve)
66...Water trap 7...Control device (refueling detection means)

Claims (7)

A fuel storage device that stores fuel to be supplied to an internal combustion engine,
a fuel tank that stores fuel containing olefinic hydrocarbons at a predetermined ratio or more;
an inert gas filling device that supplies part of the exhaust gas of the internal combustion engine as an inert gas into the fuel tank, and seals the inert gas into the fuel tank;
Refueling detection means for detecting that fuel has been supplied into the fuel tank,
The inert gas filling device is a fuel storage device, wherein the inert gas filling device fills inert gas into the fuel tank in response to detection of refueling by the refueling detection means. A fuel storage device that stores fuel to be supplied to an internal combustion engine,
a fuel tank that stores fuel containing olefinic hydrocarbons at a predetermined ratio or more;
an inert gas filling device that supplies part of the exhaust gas of the internal combustion engine as an inert gas into the fuel tank and seals the inert gas into the fuel tank,
The inert gas filling device includes:
an inert gas passage connecting the exhaust gas passage of the internal combustion engine and the fuel tank;
an exhaust gas chamber provided in the inert gas passage;
a first valve provided in the inert gas passage closer to the fuel tank than the exhaust gas chamber;
A control device that opens and closes the first valve ,
The fuel storage device is characterized in that the control device supplies the exhaust gas in the exhaust gas chamber into the fuel tank by opening the first valve in a state where the internal pressure of the exhaust gas chamber is higher than atmospheric pressure. . A fuel storage device that stores fuel to be supplied to an internal combustion engine,
a fuel tank that stores fuel containing olefinic hydrocarbons at a predetermined ratio or more;
an inert gas filling device that supplies part of the exhaust gas of the internal combustion engine as an inert gas into the fuel tank and seals the inert gas into the fuel tank,
The inert gas filling device includes:
an inert gas passage connecting the exhaust gas passage of the internal combustion engine and the fuel tank;
an exhaust gas chamber provided in the inert gas passage;
a first valve provided in the inert gas passage closer to the fuel tank than the exhaust gas chamber;
A control device that opens and closes the first valve,
A second valve is provided in the inert gas passage closer to the exhaust gas passage than the exhaust gas chamber,
The control device closes the first valve and opens the second valve to supply exhaust gas into the exhaust gas chamber, and then closes the second valve to seal exhaust gas into the exhaust gas chamber. fuel storage device. A fuel storage device that stores fuel to be supplied to an internal combustion engine,
a fuel tank that stores fuel containing olefinic hydrocarbons at a predetermined ratio or more;
an inert gas filling device that supplies part of the exhaust gas of the internal combustion engine as an inert gas into the fuel tank and seals the inert gas into the fuel tank,
The inert gas filling device includes:
an inert gas passage connecting the exhaust gas passage of the internal combustion engine and the fuel tank;
an exhaust gas chamber provided in the inert gas passage;
a second valve provided in the inert gas passage closer to the exhaust gas passage than the exhaust gas chamber;
A control device that opens and closes the second valve,
The control device closes the second valve before the warm-up of the internal combustion engine is completed, and opens the second valve after the warm-up is completed, thereby supplying exhaust gas from the internal combustion engine after the warm-up is completed to the exhaust gas chamber. A fuel storage device characterized by: 2. A compressor is provided in the inert gas passage closer to the exhaust gas passage than the exhaust gas chamber, the compressor compressing the exhaust gas flowing through the inert gas passage and supplying the compressed gas to the exhaust gas chamber . 4. The fuel storage device according to any one of 4 to 4 . 6. The fuel storage device according to claim 2, wherein the inert gas passage or the exhaust gas chamber is provided with a water trap that captures water in the exhaust gas. a canister connected to the fuel tank via a charge pipe;
a one-way valve provided in the charge tube,
7. The fuel storage device according to claim 1, wherein the one-way valve opens when the internal pressure of the fuel tank becomes higher than a predetermined pressure.

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