JP2012097658A - Fuel tank system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel tank system that prevents the inner partial pressure of gas from increasing when a temperature in the fuel tank increases.SOLUTION: An inner pressure blockade valve 58 is disposed in a vapor-discharging pipe 56 for opening gas in the fuel tank 14 to the atmosphere. The fuel tank 14 is designed to be compressed by the external force due to a pressure actuator to reduce its volume. The inner pressure blockade valve 58 is opened and the volume of the fuel tank 14 is reduced prior to supply to the fuel tank 14, thereby reducing a gas amount in the fuel tank 14.

Description

  The present invention relates to a fuel tank system.

  As a fuel tank system mounted on an automobile, Patent Document 1 discloses a fuel tank system having an upper wall portion that can change a tank capacity by elastic deformation in accordance with the amount of evaporated fuel in the fuel tank. That is, in the fuel tank described in Patent Document 1, when the amount of evaporated fuel in the fuel tank increases, the upper wall portion bulges upward due to the pressure in the tank, and the volume of the fuel tank is increased.

  However, in the fuel tank system capable of increasing the volume of the fuel tank in this way, if the gas component in the fuel tank increases due to the increase in the volume of the fuel tank, for example, the gas partial pressure increases when the temperature in the fuel tank rises. As a result, the internal pressure of the fuel tank also increases. For this reason, it is necessary to increase the strength of the fuel tank.

JP 2009-30539 A

  In view of the above facts, an object of the present invention is to obtain a fuel tank system capable of suppressing an increase in internal gas partial pressure when the temperature in the fuel tank rises.

  According to the first aspect of the present invention, a fuel tank that contains fuel, a communication pipe for communicating an upper gas layer in the fuel tank with outside air, an on-off valve that can open and close the communication pipe, and the fuel A volume reduction portion provided on the wall of the tank and capable of reducing the volume of the fuel tank by being deformed; deformation means for applying a deformation force to cause the deformation to the volume reduction portion; and a fuel tank A pre-refueling process that is performed before refueling and a post-refueling process that is performed after refueling, and the on-off valve is opened when the pre-refueling process is detected by the process detecting unit. At the same time, the deformation means deforms the volume reducing portion to reduce the volume of the fuel tank, and when the post-refueling process is detected, the on-off valve is closed and the volume by the deformation means. A control means for releasing the deforming force to calamus, a.

  In this fuel tank system, a volume reducing portion is provided in a wall portion of a fuel tank that stores fuel. By deforming this volume reducing portion, the volume of the fuel tank can be reduced. Further, in this fuel tank system, a communication pipe is provided for communicating the upper gas layer in the fuel tank with the outside air. The communication pipe is opened and closed by an on-off valve, and can be switched between communication and non-communication with the outside air.

  When refueling pretreatment (for example, operation of the fuel lid opener or opening of the fuel lid) is detected by the processing detection means when refueling the fuel tank, the control means opens the on-off valve. At the same time, the volume reducing portion is deformed by the deforming means to reduce the volume of the fuel tank. Thereby, since the gas component in the fuel tank is discharged to the outside of the fuel tank through the communication pipe, the gas component in the fuel tank is reduced.

  Here, when fuel is supplied to the fuel tank, the fuel enters the fuel tank, so that the gas component in the fuel tank is further discharged to the outside of the fuel tank through the communication pipe. Then, after the refueling is finished, when the post-refueling process (for example, mounting of the fuel cap or closing of the fuel lid) is detected by the process detecting means, the control means closes the on-off valve and moves to the volume reducing portion by the deformation means Release the deformation force. Even if the temperature in the fuel tank rises in this state, the gas component in the fuel tank, that is, the number of gas molecules is reduced, so that an increase in the gas partial pressure can be suppressed. In this state, since the on-off valve is closed, the gas (including evaporated fuel) in the fuel tank is not discharged to the outside. In addition, since the deformation force applied to the volume reduction portion by the deformation means is released, the increase in the internal pressure is suppressed even when the volume of the fuel tank increases.

  In the invention of claim 2, in the invention of claim 1, a canister capable of adsorbing and desorbing evaporated fuel generated in the fuel tank is disposed in the communication pipe, and the on-off valve is It is provided between the fuel tank and the canister.

  Therefore, when the on-off valve is opened, the upper gas layer in the fuel tank is communicated with the outside air through the canister. For this reason, the vaporized fuel discharged from the fuel tank is adsorbed to the canister, so that the vaporized fuel can be prevented from being released into the atmosphere.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the fuel tank further includes an internal pressure detecting unit capable of detecting an internal pressure of the fuel tank, and the internal pressure detected by the internal pressure detecting unit is equal to or less than a predetermined value. In this case, the control means opens the on-off valve and performs the deformation of the volume reducing portion by the deformation means.

  That is, the control means opens the on-off valve when the pre-fueling process is detected and the internal pressure of the fuel tank is equal to or lower than a predetermined value, and causes the deforming means to apply a deforming force to the volume reducing portion. When the internal pressure of the fuel tank exceeds a predetermined value, the control means does not open the on-off valve, and the deformation means does not apply an external force to the volume reducing portion, so that the internal pressure of the fuel tank is high. Therefore, it is possible to suppress the release of the gas component to the outside air.

  According to a fourth aspect of the invention, there is provided a path opening / closing member for opening / closing a part of a fuel supply path for supplying fuel to the fuel tank according to any one of the first to third aspects. The control means performs control so that the path opening / closing member can be opened after the opening / closing valve is opened by the deforming means and the displacement of the volume reduction unit is performed.

  For example, a fuel cap corresponds to the path opening / closing member. That is, since the fuel supply path is opened after the volume reducing portion is deformed by the deformation means to reduce the volume of the fuel tank, the release of gas components in the fuel tank from the fuel supply path is suppressed. Is done.

  Since the present invention has the above-described configuration, it is possible to suppress an increase in the internal gas partial pressure when the temperature in the fuel tank rises.

1 is a schematic configuration diagram illustrating a partially broken fuel tank system according to a first embodiment of the present invention. It is sectional drawing which shows the fuel tank which comprises the fuel tank system of 1st Embodiment of this invention, (A) shows before volume reduction, (B) shows after volume reduction, respectively. 1 is a block diagram of a fuel tank system according to a first embodiment of the present invention. It is sectional drawing which shows the fuel tank which comprises the fuel tank system of 2nd Embodiment of this invention in the state before volume reduction. It is sectional drawing which shows the fuel tank which comprises the fuel tank system of 3rd Embodiment of this invention in the state before volume reduction.

  FIG. 1 shows a fuel tank system 12 according to a first embodiment of the present invention. 2A and 2B show a structure in which a fuel tank 14 constituting the fuel tank system 12 is attached to a floor panel 24 constituting a part of the vehicle body.

  The fuel tank 14 of the fuel tank system 12 is made of resin in this embodiment, and has a tank upper layer portion 16 and a tank lower layer portion 18 and a tank expansion / contraction portion 20 between them. The tank upper layer portion 16 is convex upward, and the tank lower layer portion 18 is convex downward, and these are joined by an annular tank expansion / contraction portion 20 so that the fuel can be contained inside as a whole (for example, It is formed in a substantially rectangular parallelepiped box shape.

  The tank upper layer portion 16 and the tank lower layer portion 18 have a predetermined rigidity and do not easily expand and contract. On the other hand, the tank expansion / contraction part 20 can be expanded and contracted in the vertical direction, that is, the direction in which the tank upper layer part 16 and the tank lower layer part 18 approach or separate from each other. By expanding and contracting the tank expansion / contraction part 20 in this way, the volume of the fuel tank 14 increases or decreases. In particular, the tank expansion / contraction portion 20 of the present embodiment is elastic (deformation) to the extent that the internal pressure of the fuel tank 14 increases and reaches a predetermined value in a state where the fuel tank 14 is hermetically sealed (no gas enters and exits from the outside). Ease of use).

  A lower part of the fuel tank 14 is supported by a tank band 22. Both ends of the tank band 22 are fixed to the bracket 26 of the floor panel 24, so that the fuel tank 14 is attached to the floor panel 24 while being supported by the tank band 22.

  The floor panel 24 is formed with a relief portion 44 that is curved so as to protrude upward above the fuel tank 14. The escape portion 44 has a shape surrounding the fuel tank 14 when viewed from above (in the direction of the arrow A1), and the upper portion of the fuel tank 14 is partially accommodated. In particular, a housing space 46 is formed between the upper wall 14T of the fuel tank 14 and the upper wall 44T of the escape portion 44.

  A pressing actuator 28 is disposed in the accommodation space 46. As shown in FIG. 3, the pressing actuator 28 is driven and controlled by the ECU 30, and by applying a pressing force (deformation force in the present invention) to the upper wall 14 </ b> T of the fuel tank 14 from above, the tank upper layer portion 16. Can be pressed downward. Even when the upper wall 14T is pressed downward in this way, the tank lower layer 18 is supported by the tank band 22, so that the tank expansion / contraction part 20 is surely contracted, the tank upper layer 16 is lowered, and the volume of the fuel tank 14 is reduced. Is reduced. Therefore, in this embodiment, the tank expansion / contraction part 20 and the tank upper layer part 18 are volume reduction parts according to the present invention.

  As the pressing actuator 28, as long as it is possible to apply an external force required to reduce the volume of the fuel tank 14 by pressing the upper wall 14T (tank upper layer portion 16) downward as described above, the configuration thereof is sufficient. Is not particularly limited. For example, a structure using a motor, a solenoid, or a structure using hydraulic pressure (such as hydraulic pressure) may be used.

  As shown in FIG. 1, the fuel tank 14 is connected to the lower part of the inlet pipe 32. An upper end of the inlet pipe 32 is a fuel supply port 36, and a fuel gun is inserted into the fuel supply port 36 so that fuel can be guided to the fuel tank 14 and supplied. The inlet pipe 32 constitutes the oil supply path of the present invention. Depending on the amount of fuel in the fuel tank 14, part of the fuel is also stored in the inlet pipe 32.

  The upper wall 14T of the fuel tank 14 is provided with a valve 38 for regulating the full tank liquid level and preventing fuel leakage. When the fuel tank 14 is refueled, the valve 38 is opened until the fuel in the fuel tank 14 reaches the full tank level, and the gas in the fuel tank 14 is discharged to the canister 40 described later. Can be continued. When the fuel in the fuel tank 14 reaches the full tank level, the valve 38 is closed and the gas in the fuel tank 14 is not discharged to the canister 40, so that the fuel supplied rises in the inlet pipe 32, Refueling gun is reached. As a result, the auto-stop mechanism of the fuel gun operates to stop fueling. Further, when the vehicle on which the fuel tank 14 is mounted rolls over, the valve 38 is closed, and the outflow of fuel is suppressed.

  An oil filler port 36 at the upper end of the inlet pipe 32 is opened and closed by a fuel cap 42. A fuel lid 50 is provided on the outer side of the fuel cap 42 on the side panel 48 of the vehicle body.

  As shown in FIG. 3, the fuel lid 50 is controlled by the ECU 30 to be locked or unlocked. When a fuel lid opener (not shown) is operated, the lock is released and the upper side of the inlet pipe 32 (oil supply path) can be opened.

The fuel cap 42 closes the inlet pipe 32 in a state where the fuel cap 42 is attached to the fuel filler port 36, and restricts access of the fuel gun to the inlet pipe 32 (oil supply path). On the other hand, when the fuel cap 42 is removed from the fuel filler port 36, the upper part of the inlet pipe 32 (oil supply path) is opened, and access to the fuel supply path becomes possible.
The vehicle body is provided with a cap open / close sensor 52, which detects the open / closed state of the fuel cap 42 and sends the information to the ECU 30. Similarly, a lid opening / closing sensor 54 is provided on the vehicle body, and the opening / closing state of the fuel lid 50 is detected, and the information is sent to the ECU 30.

  A canister 40 is disposed above the fuel tank 14. In the canister 40, an adsorbent made of activated carbon or the like is accommodated, and the adsorbent can adsorb and desorb the evaporated fuel. The fuel tank 14 and the canister 40 are communicated with each other through a vapor discharge pipe 56.

  In the middle of the vapor discharge pipe 56, an internal pressure blocking valve 58 is provided. As shown in FIG. 3, the internal pressure sealing valve 58 is controlled by the ECU 30 to be opened and closed. When the internal pressure blocking valve 58 is closed, the gas containing the evaporated fuel does not flow from the fuel tank 14 to the canister 40. On the other hand, when the internal pressure blocking valve 58 is opened, this gas can be fed into the canister 40.

  As the internal pressure sealing valve 58, an electric on-off valve, a mechanical on-off valve, an on-off valve using both electric and mechanical methods, and the like can be used. The internal pressure blocking valve 58 can be operated as a safety valve that suppresses an excessive increase in internal pressure by opening the fuel tank 14 when the fuel tank 14 is at a high pressure.

  The canister 40 is further provided with an air release pipe 60. The end of the atmosphere release pipe 60 is open to the atmosphere. Therefore, when the internal pressure blocking valve 58 is closed, the gas in the fuel tank 14 passes through the canister 40 (at this time, the evaporated fuel is adsorbed by the adsorbent) and then discharged to the atmosphere.

  A purge pipe 62 connects between the canister 40 and an engine (not shown). When negative pressure from the engine acts on the canister 40, outside air is introduced into the canister 40 from the atmosphere opening pipe 60, and the evaporated fuel adsorbed on the canister 40 is desorbed (purged) and sent to the engine. The air release pipe 60 is provided with an air filter 64 that removes foreign matter in the outside air introduced into the canister 40. This foreign matter includes substances that reduce the cross-sectional area of the flow path of the air release pipe 60, such as water and mud, in addition to air and dirt.

  A fuel pump module 66 for sending the internal fuel to the engine is provided in the fuel tank 14. The fuel pump module 66 and the engine are communicated with each other through a fuel supply pipe 68, and the fuel can be sent to the engine by driving a fuel pump 70 that constitutes the fuel pump module 66. Further, the fuel pump module 66 includes a liquid level sensor 72 so that the fuel level in the fuel tank 14 can be detected. The detected liquid level is sent to the ECU 30 as shown in FIG.

  In the present embodiment, the fuel pump 70 includes an outer cylinder 70G installed on the lower wall 14B of the fuel tank 14, and an inner cylinder that is slidably arranged up and down inside the outer cylinder 70G and is engaged with the upper wall 14T. 70N. As the inner cylinder 70N slides up and down with respect to the outer cylinder 70G, the fuel pump 70 follows the vertical movement of the tank upper layer portion 16 (expansion / contraction of the fuel tank 14).

  A tank internal pressure sensor 74 is provided on the upper wall 14 </ b> T of the fuel tank 14. The tank internal pressure sensor 74 detects the internal pressure of the fuel tank 14. Information on the detected internal pressure of the fuel tank 14 is sent to the ECU 30.

  Next, the operation of the fuel tank system 12 of this embodiment will be described.

  In the fuel tank system 12 of the present embodiment, the internal pressure block valve 58 is closed in a normal state (a state excluding before and after refueling described later). Therefore, the gas (including the evaporated fuel) in the fuel tank 14 does not move to the canister 40.

  When the fuel tank 14 is refueled, the vehicle ignition switch is turned off by an occupant (may be a refueler). In this state, when an opening operation (fuel refueling pretreatment) of the fuel lid 50 is performed by an operation of the fuel lid opener, the ECU 30 detects this.

  Next, when the internal pressure of the fuel tank 14 detected by the tank internal pressure sensor 74 is equal to or lower than a predetermined value, the ECU 30 determines that fuel can be safely supplied. However, at this stage, the ECU 30 maintains at least the lock of the fuel cap 42. In addition, you may maintain the lock | rock of the fuel lid 50 further as needed.

  Here, the ECU 30 opens the internal pressure block valve 58. Thereby, the gas in the fuel tank 14 can move to the canister 40. Further, the ECU 30 drives the pressing actuator 28 to apply a pressing force to the upper wall 14T of the fuel tank 14 from above, thereby pressing the tank upper layer portion 16 downward. Thereby, the tank expansion / contraction part 20 contracts, the tank upper layer part 16 falls, and the volume of the fuel tank 14 is reduced. Since the gas in the fuel tank 14 moves to the canister 40, the gas component (gas molecular weight) in the fuel tank 14 decreases.

  Thus, when the volume of the fuel tank 14 is reduced to a predetermined value, the ECU 30 stops driving the pressing actuator 28. Next, the ECU 30 releases the lock of the fuel cap 42 (if the fuel lid 50 is also locked, the ECU 30 releases this lock). When the fuel lid 50 is opened and the fuel cap 42 is further removed, the fuel gun can be inserted into the inlet pipe 32 and fuel can be supplied to the fuel tank 14.

  Thus, after the volume of the fuel tank 14 is reduced, the fuel cap 42 is removed from the fuel filler port 36 and the inlet pipe 32 (fuel supply path) is opened. Therefore, when the volume of the fuel tank 14 is reduced, the inlet pipe 32 is reduced. Thus, it is possible to prevent the gas (including the evaporated fuel) in the fuel tank 14 from being inadvertently released to the outside.

  During refueling, the gas in the fuel tank 14 moves to the canister 40, whereby the gas is replaced with fuel in the fuel tank 14. Thereby, the gas component (gas molecular weight) in the fuel tank 14 further decreases. In the canister 40, the evaporated fuel in the gas is adsorbed by the adsorbent and purified. The purified gas is discharged from the atmosphere open pipe 60 to the atmosphere.

  When the fuel level in the fuel tank 14 rises and reaches the valve 38 (see the full tank liquid level L1 shown in FIG. 2B), the gas in the fuel tank 14 is not discharged to the canister 40. Rises in the inlet pipe 32. When the fuel in the inlet pipe 32 reaches the fueling gun, the fueling gun auto-stop mechanism works to stop the fueling.

  When the refueling is completed, the fuel cap 42 is attached to the inlet pipe 32 (processing after refueling), and the fuel lid 50 is closed. When the lid opening / closing sensor 54 detects that the fuel lid 50 has been closed in this manner (and, if necessary, the cap opening / closing sensor 52 detects that the fuel cap 42 has been attached), the ECU 30 The internal pressure block valve 58 is closed. As a result, the gas discharge path (vapor discharge pipe 56) from the fuel tank 14 to the canister 40 is blocked, and the gas does not move from the fuel tank 14 to the canister 40.

  Further thereafter, the ECU 30 stops driving the pressing actuator 28 and releases the pressing force on the upper wall 14T of the fuel tank 14. The fuel tank 14 in which the pressing force no longer acts is expanded to a certain size in which the elasticity of the fuel tank 14 itself (particularly the elasticity of the tank expansion / contraction part 20) and the external pressure and internal pressure of the fuel tank 14 are balanced. However, at this time, since the internal pressure blocking valve 58 is closed, the gas molecular weight in the fuel tank 14 maintains a constant value and does not increase.

  As can be seen from the above description, in the fuel tank system 12 of the present embodiment, the volume is reduced by compressing the fuel tank 14 before refueling, so that the fuel tank system 12 is sucked into the fuel tank 14 together with fuel during refueling. The amount of air can also be reduced. Therefore, the number of gas molecules inside the fuel tank 14 is reduced as compared with the fuel tank system configured so as not to reduce the volume by compressing the fuel tank 14 in this way. For this reason, even if the temperature in the fuel tank 14 rises at times other than during fueling, such as when the vehicle is running or parked, an increase in the gas partial pressure in the fuel tank 14 can be suppressed. Further, it is not necessary to increase the strength of the fuel tank 14 in consideration of an excessive increase in the gas partial pressure.

  When the internal pressure of the fuel tank 14 rises at a timing other than the time of refueling in this way, the pressure of the fuel tank 14 by the pressing actuator 28 is released, so that the tank expansion / contraction part 20 extends and the volume of the fuel tank 14 increases. Is done. This also suppresses an excessive increase in the internal pressure of the fuel tank 14.

  Further, in this state, since the internal pressure block valve 58 is closed, the gas (including the evaporated fuel) in the fuel tank 14 is not sent to the canister 40.

  In the above description, the operation of the fuel lid opener is given as the pre-oiling process of the present invention, but instead, the opening operation of the fuel lid 50 may be the pre-oiling process, or these may be used in combination. Further, as the post-refueling process, the attachment of the fuel cap 42 to the inlet pipe 32 is cited, but instead of this, the closing operation of the fuel lid 50 may be performed, or these may be used in combination.

  FIG. 4 partially shows a fuel tank system 82 according to a second embodiment of the present invention. In the second embodiment, the overall configuration of the fuel tank system 82 is the same as that of the first embodiment, and a description thereof will be omitted.

  A bead 86 extending downward is formed on the upper wall 84T of the fuel tank 84 constituting the fuel tank system 82 of the second embodiment, and a concave portion 88 is formed on the upper side of the bead 86. The bead 86 acts as a resistance against the fuel flow in the fuel tank 84 and suppresses the flow noise, and suppresses this bias when the fuel in the fuel tank 84 is biased due to turning or tilting of the vehicle. Thus, there is an effect of preventing temporary fuel shortage, and further, the rigidity of the upper wall 84T of the fuel tank 84 is enhanced, and the effect of suppressing deformation when the inside of the fuel tank 84 becomes negative pressure is exhibited. The thing etc. can be mentioned. The bead 86 that exhibits any one of these actions may be used, but the shape and position of the bead 86 can be appropriately set so as to exhibit all these actions.

  In the fuel tank system 82 of the second embodiment, the pressing actuator 28 is provided in the recess 88. In other words, since the pressing actuator 28 is arranged using the recess 88 effectively, the space efficiency is higher than that of the fuel tank system 82 of the first embodiment. In other words, since the upper wall 84T is bulged upward on both sides of the bead 86 (recessed portion 88), the maximum capacity of the fuel tank 84 can be increased.

  FIG. 5 partially shows a fuel tank system 112 according to a third embodiment of the present invention. Also in the third embodiment, the overall configuration of the fuel tank system 112 is the same as that of the first embodiment, and thus the description thereof is omitted.

  In the fuel tank system 112 of the third embodiment, a tension actuator 118 is arranged in the fuel tank 114 as a deforming means of the present invention, instead of the pressing actuator 28 of the first embodiment. In particular, in the example shown in FIG. 5, the tension actuator 118 is integrated with the fuel pump module 66, and a cylindrical pump housing 120 (corresponding to the outer cylinder 70 </ b> G of the first embodiment) constituting the fuel pump 70. The lifting / lowering rod 122 is formed in a cylindrical or columnar shape having a smaller diameter than that of the pump housing 120.

  A female screw is formed on the inner peripheral surface of the pump housing 120, and a male screw 128 is formed on the outer peripheral surface of the elevating rod 122. The upper end of the elevating rod 122 is an engagement flange 124 extending radially outward, and is fitted in a rotatable state to a fitting ring 126 provided on the upper wall 114T of the fuel tank 114. .

  The elevating rod 122 is rotated by an elevating motor (not shown) arranged in the pump housing 120. With this rotation, the lifting rod 122 moves up and down with respect to the pump housing 120. Note that the tension actuator 118 (lifting motor) is driven and controlled by the ECU 30 in the same manner as the pressing actuator 28 of the first embodiment.

  In the fuel tank system 112 of the third embodiment, a downward tensile force (deformation force) is applied to the upper wall 114T of the fuel tank 114 by the tensile actuator 118 disposed inside the fuel tank 114 as described above. By displacing the tank upper layer portion 16 downward, the volume of the fuel tank 114 is reduced. Except this, there exists an effect similar to the fuel tank system 112 of 1st Embodiment.

  The deformation means according to the present invention is not limited to the pressing actuator 28 and the tension actuator 118 described above. In short, the deformation force is applied to the volume reduction portion of the fuel tank to reduce the volume of the fuel tank. I can do it.

  Furthermore, as the volume reduction part of the fuel tank according to the present invention, the structure in which the tank upper layer part 16 is lowered as the tank expansion / contraction part 20 contracts is mentioned above. It may be fixed to the floor panel 24) and the tank lower layer 18 may be raised to reduce the volume of the fuel tank. Furthermore, the fuel tank may be contracted in the lateral direction (either in the vehicle width direction or in the vehicle front-rear direction) to reduce the volume.

  In each of the above embodiments, when the internal pressure of the fuel tank 14 detected by the tank internal pressure sensor 74 is equal to or less than a predetermined value, it is determined that the fuel can be safely supplied, and the internal pressure sealing valve 58 is opened and deformed (the pressing actuator 28). Alternatively, the tension actuator 118) is driven, but the internal pressure block valve 58 may be opened and the deformation means (the pressing actuator 28 or the tension actuator 118) may be driven without detecting the internal pressure of the fuel tank 14. .

12 Fuel tank system 14 Fuel tank 14T Upper wall (wall part)
16 Upper tank part (volume reduction part)
28 Pressing actuator (deformation means)
30 ECU (control means)
40 canister 52 cap open / close sensor (process detection means)
54 Lid open / close sensor (process detection means)
56 Vapor discharge piping (communication piping)
58 Internal pressure blocking valve (open / close valve)
60 Open air pipe (communication piping)
74 Tank internal pressure sensor (internal pressure detection means)
82 Fuel tank system 84 Fuel tank 112 Fuel tank system 114 Fuel tank 118 Tension actuator (deformation means)

Claims (4)

A fuel tank containing fuel;
A communication pipe for communicating the upper gas layer in the fuel tank with the outside air;
An on-off valve capable of opening and closing the communication pipe;
A volume reducing portion that is provided on the wall of the fuel tank and can be deformed to reduce the volume of the fuel tank;
Deformation means for applying a deformation force for causing the deformation in the volume reducing portion;
A process detecting means capable of respectively detecting a pre-fueling process performed before refueling to the fuel tank and a post-fueling process performed after refueling;
When the pre-refueling process is detected by the process detecting means, the on-off valve is opened and the volume reducing portion is deformed by the deforming means to reduce the volume of the fuel tank, and the post-refueling process is detected. Then, the control means for closing the on-off valve and releasing the deformation force to the volume reducing portion by the deformation means,
Having fuel tank system. A canister capable of adsorbing and desorbing evaporated fuel generated in the fuel tank is disposed in the communication pipe,
The fuel tank system according to claim 1, wherein the on-off valve is provided between the fuel tank and the canister. An internal pressure detecting means capable of detecting the internal pressure of the fuel tank;
The said control means performs the said deformation | transformation of the said volume reduction | decrease part by the valve opening of the said on-off valve and the said deformation | transformation means when the internal pressure detected by the said internal pressure detection means is below a predetermined value. Fuel tank system. A path opening / closing member that opens and closes a part of a fuel supply path for supplying fuel to the fuel tank;
4. The control unit according to claim 1, wherein the control unit performs control so that the path opening / closing member can be opened after the opening / closing valve is opened by the deforming unit and the displacement of the volume reducing unit is performed. The fuel tank system according to item 1.

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