JP2016113027A - Fuel tank device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To liquefy efficiently fuel vapor generated inside a tank body without requiring a large-sized heat exchanger, or a condenser having a large power consumption.SOLUTION: Such a constitution is adopted that an internal tank 30 is arranged inside a tank body 12 for storing a fuel inside, and that volatile liquid is supplied to the inside of the tank body 12 to allow the volatile liquid to evaporate naturally in the tank body 12, and that the inside air in the internal tank 30 is discharged outside by an air exhauster 44.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fuel tank device, and more particularly to a fuel tank device including a device for liquefying fuel vapor generated inside a tank body.

  2. Description of the Related Art A fuel tank device for supplying a hydrocarbon-based fuel such as gasoline to an internal combustion engine of a vehicle such as an automobile includes a tank body having a sealed container structure that contains the fuel in a liquid state. In such a fuel tank device, fuel vapor is generated inside the tank body due to the ambient temperature of the tank body. Therefore, the heat exchanger provided inside or outside the tank body, the inside of the tank body, or the flow path of the fuel vapor It is proposed that the fuel vapor is cooled and re-liquefied by a cooler using a Peltier effect element provided in (for example, Patent Documents 1 and 2). This re-liquefaction of fuel vapor can reduce the adsorption load of a fuel vapor adsorption device such as a charcoal canister.

Japanese Patent No. 3399422 Japanese Patent No. 3830353

  However, the heat exchange area is large in order to liquefy the fuel vapor generated inside the tank body with a heat exchanger or cooler, and to liquefy a sufficient amount of fuel vapor effective for reducing the adsorption load of the fuel vapor adsorption device. Large heat exchangers and large capacity coolers are required. Large heat exchangers are poorly mounted on vehicles, and coolers using Peltier effect elements consume too much power.

  In a hybrid car, the operating time of the running internal combustion engine is shorter than that of an automobile having only the internal combustion engine, so that the period during which the fuel vapor adsorbed by the fuel vapor adsorption device can be discharged into the intake passage of the internal combustion engine is Less than a car with only an engine. For this reason, there is a great demand for a hybrid car to reduce the adsorption load of the fuel vapor adsorption device, and liquefaction of the fuel vapor generated inside the tank body requires a large heat exchanger and a cooler with high power consumption. There is a high need for efficient operation.

  The problem to be solved by the present invention is to enable the liquefaction of fuel vapor generated inside the tank body to be efficiently performed without requiring a large heat exchanger or a cooler with high power consumption. is there.

  The fuel tank apparatus according to the present invention includes a tank body (12) for containing fuel therein, an internal tank (30) at least partially disposed inside the tank body (12), and the internal tank (30). A volatile liquid supply device (36, 38, 40) for supplying a volatile liquid to the interior of the tank, and an exhaust device (44) for discharging the internal air of the internal tank (30) to the outside of the tank body (12). Have.

  According to this configuration, the volatile liquid supplied to the internal tank (30) spontaneously evaporates in the internal tank (30), whereby the internal tank (30) is cooled by heat of vaporization, and the internal tank (30) and Cooling and liquefaction of the fuel vapor (Fb) in the tank body (12) in a heat exchange relationship are effectively performed. Since the vapor generated in the internal tank (30) by natural evaporation is discharged to the outside by the exhaust device (44), the internal tank (30) is not in a high vapor concentration state, and the internal tank (30) It is maintained that the natural evaporation in is performed well.

  The fuel tank device according to the present invention preferably further includes a detection device (52, 54) for detecting an internal temperature or an internal pressure of the tank body (12), and the detection device (52, 54). When the internal temperature or the internal pressure is less than a predetermined value, the supply of the volatile liquid to the internal tank (30) is stopped and the exhaust device (44) is turned off so that the internal temperature or the internal pressure is not less than a predetermined value. A control device (50) for supplying a volatile liquid to the internal tank (30) and turning on the exhaust device (44).

  According to this configuration, the supply of the volatile liquid to the internal tank (30) and the operation of the exhaust device (44) are performed only when the fuel vapor (Fb) in the tank body needs to be cooled and liquefied. Energy for operating the ionic liquid and the exhaust device (44) is not wasted.

  The fuel tank device according to the present invention preferably has an atomizing device (56) for supplying a volatile liquid in the form of a mist to the inside of the internal tank (30).

  According to this configuration, the internal tank (30) is effectively cooled by the natural evaporation of the volatile liquid droplets adhering to the inner surface of the internal tank (30).

  The fuel tank apparatus according to the present invention preferably includes an impregnation member (48) provided in the internal tank (30) for impregnating and holding a volatile liquid.

  According to this configuration, the internal tank (30) is effectively cooled by natural evaporation of the volatile liquid impregnated and held by the impregnation member (48).

  A fuel tank apparatus according to the present invention includes a tank body (12) that contains fuel therein, and an internal tank (at least a part of which is disposed inside the tank body (12) and has a negative pressure relative to atmospheric pressure ( 30) and a volatile liquid supply device (36, 38, 40) for supplying a volatile liquid to the inside of the internal tank (30).

  According to this configuration, the internal pressure of the internal tank (30) is made negative with respect to the atmospheric pressure, so that the vapor partial pressure of the volatile liquid in the internal tank (30) is reduced, and the volatile liquid is vaporized. Is promoted. Thereby, cooling of the internal tank (30) by the heat of vaporization is promoted, and cooling and liquefaction of the fuel vapor (Fb) in the tank body (12) in a heat exchange relationship with the internal tank (30) are effectively performed. .

  The fuel tank device according to the present invention is preferably a detection device that detects an internal temperature or an internal pressure of the tank main body (12) when the internal tank (30) is at a negative pressure relative to the atmospheric pressure. 52, 54), and when the internal temperature or the internal pressure detected by the detection device (52, 54) is less than a predetermined value, the supply of the volatile liquid to the internal tank (30) is stopped, and the internal When the temperature or the internal pressure is equal to or higher than a predetermined value, a volatile liquid is supplied to the internal tank (30).

  According to this configuration, since the volatile liquid is supplied to the internal tank (30) only when the fuel vapor (Fb) in the tank body needs to be cooled and liquefied, the volatile liquid is wasted. It will not be consumed.

  In the fuel tank apparatus according to the present invention, preferably, the internal tank (30) is set to a negative pressure by using an intake negative pressure of an internal combustion engine (80) mounted on a vehicle.

  According to this configuration, there is no need to separately provide a negative pressure pump or the like for negative pressure inside the internal tank (30).

  According to the fuel tank device of the present invention, the volatile liquid spontaneously evaporates in the internal tank, whereby the internal tank is cooled by the heat of vaporization, and cooling of the fuel vapor in the tank body in a heat exchange relationship with the internal tank, Since the liquefaction is effectively performed, the liquefaction of the fuel vapor generated in the tank body is efficiently performed without requiring a large heat exchanger or a cooler with high power consumption. Since the water vapor generated in the internal tank by natural evaporation is discharged to the outside by the exhaust device, the internal tank does not become a high vapor concentration state, and the natural evaporation in the internal tank is maintained well. The

1 is a schematic configuration diagram showing Embodiment 1 of a fuel tank device according to the present invention. The schematic block diagram which shows Embodiment 2 of the fuel tank apparatus by this invention. The schematic block diagram which shows Embodiment 3 of the fuel tank apparatus by this invention. The schematic block diagram which shows Embodiment 4 of the fuel tank apparatus by this invention. The schematic block diagram which shows Embodiment 5 of the fuel tank apparatus by this invention. The schematic block diagram which shows Embodiment 6 of the fuel tank apparatus by this invention. The schematic block diagram which shows Embodiment 7 of the fuel tank apparatus by this invention.

  Below, Embodiment 1 of the fuel tank apparatus by this invention is demonstrated with reference to FIG.

  A fuel tank apparatus 10 according to the first embodiment is for supplying fuel such as gasoline to an internal combustion engine (not shown) of an automobile including a hybrid car, and includes a tank body 12 having a sealed container structure.

  The tank body 12 has a fuel storage chamber 16 defined by the outer wall 14, and stores fuel inside, that is, in the fuel storage chamber 16. The tank body 12 is provided with a fuel injection pipe 18 for injecting liquid fuel into the fuel storage chamber 16 and a fuel pump (not shown) for sending the fuel in the fuel storage chamber 16 to the internal combustion engine (engine).

  A charcoal canister 26 is connected to the tank body 12 by a fuel vapor pipe 20, a differential pressure valve 22, and a fuel vapor pipe 24 that communicate with the upper portion of the fuel storage chamber 16.

  The fuel exists in a liquid state (liquid fuel Fa) in the lower portion of the fuel storage chamber 16. The fuel vapor Fb generated in the fuel storage chamber 16 exists in the tank space above the liquid level of the liquid fuel Fa. When the pressure in the fuel storage chamber 16 exceeds a predetermined value by the fuel vapor Fb, the differential pressure valve 22 opens, and the fuel vapor Fb in the fuel storage chamber 16 flows to the charcoal canister 26 and is adsorbed and held by the charcoal canister 26. The fuel vapor adsorbed and held by the charcoal canister 26 is discharged into an intake passage (not shown) of the internal combustion engine through the purge pipe 28 under the same control as that of the conventional one.

  An internal tank 30 disposed inside the tank body 12 is attached to the tank body 12. The internal tank 30 has a vaporization chamber 34 defined by an outer wall 32 at the top of the fuel storage chamber 16. The outer wall 32 forms a heat exchange wall that separates the fuel storage chamber 16 and the vaporization chamber 34 and exchanges heat between the two.

  Above the internal tank 30, a water tank 36 is provided as a volatile liquid supply device. The water tank 36 stores water as a volatile liquid. A water supply pipe 38 is connected to the bottom of the water tank 36. The water supply pipe 38 extends vertically and has a lower end connected to the upper portion of the internal tank 30, and supplies water from the water tank 36 into the internal tank 30, that is, the vaporization chamber 34 by water head pressure. The water tank 36 may be replenished with rainwater from the roof portion of the automobile or the cowl top portion below the front shield glass, water discharged from the air conditioner, or the like.

  An electromagnetic on-off valve 40 is provided in the middle of the water supply pipe 38. The electromagnetic on-off valve 40 supplies and stops water to the vaporizing chamber 34 by opening and closing the valve, and a boundary surface between water and air, that is, a vaporizing surface (natural evaporation surface) A is formed in the vaporizing chamber 34. Thus, the amount of water supplied to the vaporizing chamber 34 is controlled.

  The upper part (above the vaporization surface A) of the internal tank 30 is connected to the electric exhaust pump 44 by an exhaust pipe 42. In the middle of the exhaust pipe 42, an electromagnetic opening / closing valve 46 that seals the vaporization chamber 34 by closing the valve is provided.

  The electric exhaust pump 44 is a suction pump, and when the electromagnetic opening / closing valve 46 is open, the electric exhaust pump 44 sucks the internal air (water vapor) of the internal tank 30 and discharges it into the atmosphere. The fuel is discharged outside the tank body 12 and the internal tank 30.

  A temperature sensor 52 is attached to the tank body 12. The temperature sensor 52 detects the temperature of the liquid fuel Fa in the fuel storage chamber 16 and outputs a sensor signal indicating the temperature to the control device 50.

  When the temperature of the liquid fuel Fa detected by the temperature sensor 52 is less than a predetermined value, the control device 50 closes the electromagnetic on-off valve 40 and turns off the electric exhaust pump 44 so that the temperature of the liquid fuel Fa is predetermined. When the value is equal to or greater than the value, the electromagnetic on-off valve 40 is opened to control the amount of water supplied to form the vaporized surface A, and the control to turn on the electric exhaust pump 44 is performed.

  The control device 50 performs control to open the electromagnetic on-off valve 46 while the engine is operating and to close the electromagnetic on-off valve 46 when the engine is stopped. The closing of the electromagnetic on-off valve 46 when the engine is stopped may be performed in a state where the vaporizing chamber 34 is decompressed by the internal air suction by the electric exhaust pump 44.

  When the temperature of the liquid fuel Fa becomes equal to or higher than a predetermined value, the supply amount of water to the vaporizing chamber 34 is controlled by opening and closing the electromagnetic on-off valve 40, and the vaporizing surface A is formed in the vaporizing chamber 34. Water spontaneously evaporates on the vaporization surface A, and the outer wall 32 of the internal tank 30 is cooled with high cold energy by the heat of vaporization. Thereby, the fuel vapor Fb in the fuel storage chamber 16 is effectively cooled, and the liquefaction of the fuel vapor Fb generated inside the tank body 12 requires a large heat exchanger or a cooler with high power consumption. Without being done efficiently. The liquefaction of the fuel vapor Fb reduces the fuel vapor adsorption load of the charcoal canister 26.

  When the temperature of the liquid fuel Fa exceeds a predetermined value, the electric exhaust pump 44 is turned on, and water vapor generated by natural evaporation on the vaporization surface A is discharged outside the vaporization chamber 34 by the electric exhaust pump 44. 34 is not in a high humidity state, and natural evaporation on the vaporized surface A is maintained well without being reduced by excessive time. The discharge of water vapor by the electric exhaust pump 44 reduces the vapor pressure of the vaporizing chamber 34 by suctioning the inside air, so that the vapor partial pressure of water in the vaporizing chamber 34 is reduced, and natural evaporation of water in the vaporizing chamber 34 is promoted. Thereby, the outer wall 32 of the internal tank 30 is quickly cooled.

  Since the replenishment of water to the vaporizing chamber 34 and the ON operation of the electric exhaust pump 44 are performed only when the temperature of the liquid fuel Fa is equal to or higher than a predetermined value, the water in the water tank 36 and the driving power of the electric exhaust pump 44 are wasted. There is no unnecessary consumption.

  When the temperature of the liquid fuel Fa reaches a predetermined value or more, supply of a small amount of water to the vaporizing chamber 34 is started, and while the temperature of the liquid fuel Fa is equal to or higher than the predetermined value, the water However, when the temperature of the liquid fuel Fa is lower than a predetermined value while the vaporization chamber 34 is maintained in a state where it can be vaporized immediately or quickly, the vaporization chamber 34 can be empty without water.

  By using rainwater and wastewater from air conditioners as volatile liquids, there is no need to separately prepare volatile liquids for evaporative cooling, which eliminates system costs and adversely affects the environment. Never give.

  When the engine is stopped, the electromagnetic on-off valve 46 is closed while the vaporizing chamber 34 is depressurized by the suction of the internal air by the electric exhaust pump 44, and when the vaporizing chamber 34 is sealed, the vapor partial pressure of water in the vaporizing chamber 34 is reduced. Since the natural evaporation in the vaporizing chamber 34 is promoted by the lowering, the outer wall 32 of the internal tank 30 can be maintained in a state where it is cooled with high cooling energy even after the engine is stopped.

  The opening / closing of the electromagnetic on-off valve 40 and the on / off of the electric exhaust pump 44 may be performed according to the temperature of the fuel vapor Fb instead of the temperature of the liquid fuel Fa. Further, the opening / closing of the electromagnetic opening / closing valve 40 and the on / off of the electric exhaust pump 44 may be performed according to the pressure of the gas phase portion of the tank body 12 detected by the pressure sensor 54 instead of the temperature of the liquid fuel Fa. . In this case, when the pressure detected by the pressure sensor 54 is less than the predetermined value, the control device 50 closes the electromagnetic on-off valve 40 and turns off the electric exhaust pump 44 so that the pressure is equal to or higher than the predetermined value. In some cases, the electromagnetic on-off valve 40 is opened to control the amount of water supplied to form the vaporized surface A, and the electric exhaust pump 44 is controlled to be turned on.

  Next, Embodiment 2 of the fuel tank apparatus according to the present invention will be described with reference to FIG. 2, parts corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

In this embodiment, an impregnation sheet 48 is attached to the inner surface of the outer wall 32 of the inner tank 30. The impregnation sheet 48 is constituted by a continuous porous member such as a sponge, is provided so as to cover the entire outer wall 32, and impregnates and holds water supplied from the water tank 36. In this case, the surface on which the impregnated sheet 48 is exposed to the vaporization chamber 34 becomes the vaporization surface.

  The control device 50 closes the electromagnetic opening / closing valve 40 when the temperature of the liquid fuel Fa detected by the temperature sensor 52 is less than a predetermined value, and the impregnation sheet 48 is determined when the temperature of the liquid fuel Fa is equal to or higher than the predetermined value. Control is performed to open and close the electromagnetic on-off valve 40 so that a state of impregnating with water exceeding the value is maintained. Control of the electric exhaust pump 44 and the electromagnetic on-off valve 46 is performed in the same manner as in the first embodiment.

  In this embodiment, the water impregnated by the impregnation sheet 48 is naturally evaporated, whereby the outer wall 32 is cooled with high cooling energy by the heat of vaporization, and the fuel vapor Fb in the fuel storage chamber 16 is effectively cooled. Become. Thereby, also in this embodiment, the liquefaction of the fuel vapor Fb generated in the tank body 12 is efficiently performed without requiring a large heat exchanger or a cooler with high power consumption, and the charcoal canister 26 is obtained. The fuel vapor adsorption load is reduced.

  Next, a third embodiment of the fuel tank apparatus according to the present invention will be described with reference to FIG. 3, parts corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

  In this embodiment, an atomizer 56 is attached to the tip of the water supply pipe 38, and the water in the water tank 36 is supplied to the vaporization chamber 34 in the form of a mist. Thereby, many fine water droplets adhere to the inner surface of the outer wall 32. Except for this, the second embodiment is the same as the first embodiment.

  The water droplets adhering to the inner surface of the outer wall 32 spontaneously evaporate, whereby the outer wall 32 is cooled with high cooling energy by the heat of vaporization, and the fuel vapor Fb in the fuel storage chamber 16 is effectively cooled. Thereby, also in this embodiment, the liquefaction of the fuel vapor Fb generated in the tank body 12 is efficiently performed without requiring a large heat exchanger or a cooler with high power consumption, and the charcoal canister 26 is obtained. The fuel vapor adsorption load is reduced.

  Next, Embodiment 4 of the fuel tank apparatus according to the present invention will be described with reference to FIG. 4, parts corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

  In this embodiment, a plurality of bottomed cylindrical portions 58 project from the bottom of the internal tank 30 to increase the heat exchange area between the fuel storage chamber 16 and the vaporization chamber 34. Due to the expansion of the heat exchange area, the fuel vapor Fb in the fuel storage chamber 16 is further effectively cooled. Note that the vaporization surface A is preferably formed in the vaporization chamber 34 above the bottomed cylindrical portion 58 so as to ensure a large surface area, as shown in the drawing.

  Next, a fuel tank apparatus according to a fifth embodiment of the present invention will be described with reference to FIG. In FIG. 5, parts corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG.

  In this embodiment, the tank body 12 is covered with a heat insulating sheet 60. As a result, the fuel storage chamber 16 is shut off from heat input and output, and the cooling loss of the fuel storage chamber 16 by the internal tank 30 is reduced, so that the cooling of the fuel vapor Fb in the fuel storage chamber 16 is more effective. Will be done.

  Next, a sixth embodiment of the fuel tank apparatus according to the present invention will be described with reference to FIG. In FIG. 6, parts corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

  In this embodiment, the fuel tank apparatus 10 includes a sub tank 70 separately from the tank body 12 (hereinafter referred to as the main tank 12). The sub tank 70 has a sub fuel storage chamber 74 defined by an outer wall 72. The sub fuel storage chamber 74 is connected to the fuel storage chamber 16 (hereinafter referred to as the main fuel storage chamber 16) by a liquid communication pipe 76 at the bottom, and connected to the upper portion of the main fuel storage chamber 16 by a gas communication pipe 78. ing.

  The internal tank 30 is provided in the sub tank 70. Water is supplied from the water tank 36 to the vaporizing chamber 34 of the internal tank 30 as in the first embodiment, and the vaporizing surface A is formed in the vaporizing chamber 34. The outer wall 32 of the internal tank 30 forms a heat exchange wall that isolates the sub fuel storage chamber 74 and the vaporization chamber 34 and exchanges heat between the two.

As a result, the fuel vapor Fb flowing from the main fuel storage chamber 16 through the gas communication pipe 78 to the sub fuel storage chamber 74 is cooled and liquefied in the sub fuel storage chamber 74. The liquefied fuel returns to the main fuel storage chamber 16 through the liquid communication pipe 76. In this manner, the same effects as in the first embodiment can be obtained in the sixth embodiment.

  Next, a fuel tank device according to a seventh embodiment of the present invention will be described with reference to FIG. In FIG. 6, parts corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

  In this embodiment, the electric exhaust pump 44 is omitted, and the exhaust pipe 42 is connected to an intake passage 82 of an internal combustion engine 80 mounted on an automobile (vehicle). As a result, the vaporization chamber 34 becomes a negative pressure compared to the atmospheric pressure due to the negative intake pressure of the internal combustion engine 80.

  With the vaporizing chamber 34 empty, the electromagnetic on-off valve 46 is opened under the operation of the internal combustion engine 80 to set the internal tank 30 to the atmospheric pressure, and then the electromagnetic on-off valve 46 is closed to Maintain negative pressure. Then, after the internal combustion engine 80 stops, the electromagnetic on-off valve 40 is opened according to the internal temperature or internal pressure of the tank body 12, and the water in the water tank 36 is supplied to the vaporization chamber 34.

  Thereby, in the vaporization chamber 34, water evaporates spontaneously in an atmosphere where the vapor partial pressure is reduced, and the vaporization of water is promoted. As a result, the cooling of the internal tank 30 by the heat of vaporization is promoted, and the cooling and liquefaction of the fuel vapor Fb in the tank body 12 in a heat exchange relationship with the internal tank 30 are effectively performed. The amount of water supplied at this time may be a very small amount so that the water can be immediately or rapidly vaporized in the vaporizing chamber 34.

  With this configuration, even after the internal combustion engine 80 is stopped, the fuel vapor Fb in the tank body 12 can be effectively cooled and liquefied without substantially consuming electric power. Further, when the intake negative pressure of the internal combustion engine 80 is used, a pressure sensor for detecting the internal pressure of the internal tank 30 is further provided so as to correspond to the internal pressure of the internal tank 30 during operation of the internal combustion engine 80. The internal tank 30 may be maintained in a negative pressure state by appropriately opening and closing the electromagnetic opening / closing valve 46.

  In this embodiment, since the intake negative pressure of the internal combustion engine 80 is used, it is not necessary to separately provide a negative pressure pump or the like for applying a negative pressure to the inside of the internal tank 30. Also in this embodiment, the supply of water to the vaporizing chamber 34 is performed only when the temperature of the liquid fuel Fa is equal to or higher than a predetermined value, so there is no wasteful consumption of water in the water tank 36.

  Although the present invention has been described above with reference to preferred embodiments thereof, the present invention is not limited to such embodiments and can be deviated from the spirit of the present invention, as will be readily understood by those skilled in the art. It is possible to change appropriately within the range not to be. For example, the entire internal tank need not be disposed inside the tank body, and at least a portion of the internal tank may be disposed inside the tank body. The exhaust device is not limited to the electric exhaust pump 44, and may be a pump driven by an internal combustion engine.

  The volatile liquid is not limited to water, and may be a mixed liquid of water and ethanol. It is also possible to combine the above embodiments. In addition, all the components shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Car 10 Fuel tank apparatus 12 Tank main body 14 Outer wall 16 Fuel storage chamber (main fuel storage chamber)
26 Charcoal Canister 30 Inner Tank 32 Outer Wall 34 Vaporization Chamber 36 Water Tank 38 Water Supply Pipe 40 Electromagnetic On / Off Valve 42 Exhaust Pipe 44 Electric Exhaust Pump 46 Electromagnetic On / Off Valve 48 Impregnated Sheet 50 Control Device 52 Temperature Sensor 54 Pressure Sensor 56 Atomizer 70 Sub tank 72 Outer wall 74 Sub fuel storage chamber 80 Internal combustion engine A Vaporized surface Fa Liquid fuel Fb Fuel vapor

Claims (7)

A tank body containing fuel inside,
An internal tank disposed at least partially inside the tank body, and a volatile liquid supply device for supplying a volatile liquid to the inside of the internal tank;
A fuel tank device having an exhaust device for discharging the inside air of the internal tank to the outside of the tank body. A detection device for detecting the internal temperature or internal pressure of the tank body;
When the internal temperature or the internal pressure detected by the detection device is less than a predetermined value, the supply of the volatile liquid to the internal tank is stopped and the exhaust device is turned off so that the internal temperature or the internal pressure is predetermined. 2. The fuel tank device according to claim 1, further comprising a control device that supplies a volatile liquid to the internal tank and turns the exhaust device on when the value is equal to or greater than a value.   The fuel tank apparatus according to claim 1, further comprising an atomizing device that supplies a volatile liquid in a mist state to the inside of the internal tank.   The fuel tank apparatus according to claim 1, further comprising an impregnation member provided in the internal tank and impregnating and holding a volatile liquid. A tank body containing fuel inside,
An internal tank that is at least partially disposed within the tank body and is at a negative pressure relative to atmospheric pressure;
A volatile liquid supply device for supplying a volatile liquid into the internal tank;
A fuel tank apparatus having A detection device for detecting the internal temperature or internal pressure of the tank body;
When the internal temperature or the internal pressure detected by the detection device is less than a predetermined value, the supply of volatile liquid to the internal tank is stopped, and when the internal temperature or the internal pressure is greater than or equal to a predetermined value, the internal tank The fuel tank apparatus according to claim 5, wherein a volatile liquid is supplied to the fuel tank.   The fuel tank device according to claim 5 or 6, wherein the internal tank is set to a negative pressure by using an intake negative pressure of an internal combustion engine mounted on a vehicle.

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