Exhaust valve, fuel supply system and vehicle

Abstract

The exhaust valve comprises a first flange and an oil tank isolating valve, the first flange is suitable for fixing an oil pump on an oil tank, the first flange is suitable for being connected with the oil tank, at least part of the structure of the first flange is located outside the oil tank, and the oil tank isolating valve is arranged on the first flange. The oil tank isolation valve is located outside the oil tank and suitable for communicating the carbon tank with the oil tank. According to the exhaust valve, the oil tank isolation valve is arranged on the first flange on the oil tank, the size of the exhaust valve is reduced, a pipeline between the oil tank isolation valve and the oil tank is omitted, cost is saved, and the exhaust valve is simple in structure.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle fuel supply, and in particular to an exhaust valve, a fuel supply system and a vehicle. Background Art

[0002] The existing vehicle fuel supply system is large in size and the exhaust valve is complicated to install, resulting in high cost of the entire fuel supply system. Utility Model Content

[0003] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of this application does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0004] The technical problem to be solved by the present application is that the fuel tank isolation valve in the existing vehicle fuel supply system is relatively large in size, and the fuel tank isolation valve is connected to the fuel pump flange through a pipeline, which makes the cost of the entire fuel supply system relatively high.

[0005] In order to at least solve the above-mentioned technical problems, the first aspect of the present application provides an exhaust valve, characterized in that the exhaust valve includes a first flange and a fuel tank isolation valve, the first flange is suitable for fixing the fuel pump on the fuel tank, the first flange is suitable for connecting to the fuel tank and at least part of the structure is located outside the fuel tank; the fuel tank isolation valve is arranged on the first flange, and the fuel tank isolation valve is located outside the fuel tank; the exhaust valve is suitable for connecting the carbon canister with the fuel tank.

[0006] The utility model arranges the oil tank isolation valve on the first flange on the oil tank, omitting the pipeline between the oil tank and the oil tank isolation valve and also omitting the additional installation parts of the oil tank isolation valve, thereby reducing the volume, saving costs and having a simple structure.

[0007] Optionally, part of the structure of the first flange is formed as a part of the tank isolation valve.

[0008] Optionally, the first flange has an outer plate, which is suitable for being arranged outside the oil tank. The oil tank isolation valve comprises a first shell and a valve assembly, which is arranged in the first shell, and the outer plate forms a part of the first shell.

[0009] Optionally, a cavity is formed in the first shell, and the cavity is divided into a first cavity and a second cavity. The first cavity is suitable for communicating with the carbon canister, and the second cavity is suitable for communicating with the fuel tank. The valve assembly can connect or isolate the first cavity and the second cavity.

[0010] Optionally, the valve assembly includes a first valve plate and a first valve seat, the first valve seat is provided with a first opening, the first opening connects the first cavity and the second cavity, the diameter of the first valve plate is greater than or equal to the diameter of the first opening, and the first valve plate can block or connect the first opening.

[0011] Optionally, the valve assembly also includes an electric switching component, and the first valve plate has an open state and a closed state. In the open state, the first cavity is connected to the second cavity, and in the closed state, the first cavity is isolated from the second cavity; the electric element can drive the first valve plate to switch between the open state and the closed state.

[0012] Optionally, the valve assembly further includes a second valve sheet, which is disposed at the first opening and close to one side of the second cavity, and the second valve sheet is disposed in close contact with the first valve sheet.

[0013] Optionally, a valve hole is provided on the first valve plate, a diameter of the second valve plate is smaller than a diameter of the first opening, and the second valve plate can block the valve hole.

[0014] Optionally, a diameter of the second valve plate is greater than a maximum diameter of the valve hole.

[0015] Optionally, the valve assembly further includes a valve housing, wherein the first valve plate, the first valve seat, the second valve plate and the electric element are accommodated in the valve housing, and the projection of the valve housing on the first flange is a rectangle, the length of the rectangle is less than 60 mm, and the width of the rectangle is less than 30 mm.

[0016] Optionally, the valve assembly also includes a second valve seat and a third valve plate, the second valve seat is provided with a third opening, the third opening connects the first cavity and the second cavity, the diameter of the third valve plate is greater than or equal to the diameter of the third opening, and the third valve plate can block or connect the third opening.

[0017] Optionally, the fuel tank isolation valve further comprises a vent connector, and the vent connector is suitable for connecting the carbon canister with the first cavity.

[0018] Optionally, a through hole is provided on the outer plate, and the through hole is suitable for connecting the oil tank with the second cavity.

[0019] Optionally, the operating voltage of the exhaust valve is a variable voltage.

[0020] Optionally, the operating opening voltage of the exhaust valve is greater than the operating voltage after the exhaust valve is opened.

[0021] A second aspect of the present application provides a fuel supply system, characterized by comprising the exhaust valve of the first aspect of the present application.

[0022] According to the fuel supply system of the second aspect of the present application, by adopting the above-mentioned exhaust valve, the structure is simplified to a certain extent, the cost is reduced, and the fuel supply efficiency is improved.

[0023] The third aspect of the present application provides a vehicle, characterized in that it includes the fuel supply system of the second aspect of the present application.

[0024] According to the third aspect of the present application, the vehicle's stability can be improved to a certain extent by adopting the above-mentioned fuel supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the integrated electronically controlled exhaust valve solution;

[0026] Figure 2 is a cross-sectional view of an integrated electronically controlled exhaust valve according to an embodiment;

[0027] Figure 3 is a cross-sectional view of a fuel tank isolation valve of an integrated electronically controlled exhaust valve according to an embodiment;

[0028] Figure 4 is a cross-sectional view of a solenoid valve of an integrated electrically controlled exhaust valve according to an embodiment;

[0029] Figure 5 is a cross-sectional view of an integrated electronically controlled exhaust valve according to an embodiment;

[0030] Figure 6 is a cross-sectional view of a fuel tank isolation valve of an integrated electronically controlled exhaust valve according to an embodiment;

[0031] Figure 7 is a cross-sectional view of a solenoid valve of an integrated electrically controlled exhaust valve according to an embodiment;

[0032] Figure 8 It is a fuel supply system for an integrated electronically controlled exhaust valve.

[0033] The reference numerals in the specification are as follows:

[0034] 100. Fuel supply system; 110. Exhaust valve; 111. Fuel tank; 112. Carbon canister; 113. Fuel pump; 114. Control module; 1. First flange; 10. Outer plate; 11. Through hole; 2. Fuel tank isolation valve; 20. First shell; 21. Valve assembly; 22. Vent joint; 3. Cavity; 30. First cavity; 31. Second cavity; 4. First valve seat; 40. First opening; 41. Second opening; 5. First valve plate; 50. Valve hole; 51. First elastic element; 6. Electric element; 60. Winding group; 61. Static iron core; 62. Moving iron core; 7. Valve shell; 70. Air hole; 8. Second valve plate; 80. Second elastic element; 9. Third valve plate. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer, the utility model is further described in detail below in conjunction with the embodiments. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the embodiments of the present application, some technical features known in the art are not described.

[0036] Herein, ordinal numbers such as “first” and “second” cited in the present application are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term “first component” itself does not imply the existence of the “second component”, and the term “second component” itself does not imply the existence of the “first component”.

[0037] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0038] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0039] Unless otherwise stated, the numerical ranges herein include not only the entire range within its two endpoints but also include several sub-ranges contained therein.

[0040] Hereinafter, the exhaust valve 110 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0041] like Figure 1 and Figure 6As shown, the exhaust valve 110 includes a first flange 1 and a fuel tank isolation valve 2. In the fuel supply system 100, the fuel pump 113 is located in the fuel tank 111. A part of the structure of the first flange 1 is located in the fuel tank 111 and connected to the fuel pump 113, and the other part of the structure is located outside the fuel tank 111 and connected to the fuel tank 111, similar to a cover on the surface of the fuel tank 111, that is, the function of the first flange 1 is to fix the fuel pump 113 on the fuel tank 111. The fuel tank isolation valve 2 is arranged on the first flange 1 and is located outside the fuel tank 111, that is, the fuel tank isolation valve 2 is arranged on the part of the structure of the first flange 1 located outside the fuel tank 111, forming a technical solution of an integrated exhaust valve 110 in which the fuel tank isolation valve 2 is integrated with the first flange 1 and the fuel tank isolation valve 2 is located outside the fuel tank 111. The integrated exhaust valve 110 serves to connect the carbon canister 112 with the fuel tank 111.

[0042] The embodiment of the present application sets the oil tank isolation valve 2 on the first flange 1 on the oil tank 111, omitting the pipeline between the oil tank 111 and the oil tank isolation valve 2, and also omitting the additional installation parts of the oil tank isolation valve 2, thereby saving costs and simplifying the structure.

[0043] In some embodiments, part of the structure of the first flange 1 forms part of the tank isolation valve 2. Specifically, the part of the structure of the first flange 1 located outside the tank 111 forms part of the first housing 20 of the tank isolation valve 2 (the "first housing 20" here is the same as the "first housing 20" referred to below). The part of the structure of the first flange 1 is integrated with the part of the structure of the tank isolation valve 2 to form an integral structure that cannot be disassembled. This integration solution of the tank isolation valve 2 and the first flange 1 has a high degree of integration, avoids repeated design of the structure of the tank isolation valve 2, saves raw materials, and reduces costs.

[0044] In other embodiments, the oil tank isolation valve 2 is directly fixed to the structure of the first flange 1 located outside the oil tank 111, but the structure of the first flange 1 does not become the structure of the oil tank isolation valve 2. The first flange 1 and the oil tank isolation valve 2 are independent structural parts, and the two can form a detachable fixed structure. This integration solution is direct and simple, and can also omit the pipeline structure between the oil tank isolation valve 2 and the first flange 1, so as to simplify the structure and save costs.

[0045] In one embodiment, if Figure 1 , Figure 2 and Figure 5As shown, the first flange 1 has an outer plate 10, which is arranged outside the oil tank 111. The outer plate 10 is the structure located outside the oil tank 111 in the first flange 1 mentioned above. The oil tank isolation valve 2 includes a first housing 20 and a valve assembly 21. The outer plate 10 of the first flange 1 becomes a part of the first housing 20. In the figure, the outer plate 10 becomes the bottom of the first housing 20 of the oil tank isolation valve 2, reducing the bottom design of the first housing 20. The valve assembly 21 is accommodated in the first housing 20, and the valve assembly 21 includes a solenoid valve, a pressure valve, etc.

[0046] In one embodiment, if Figure 2-3 or Figure 5-6 As shown, a cavity 3 is formed in the first shell 20, and the cavity 3 is divided into a first cavity 30 and a second cavity 31. The valve assembly 21 such as a solenoid valve is located in the first cavity 30. The first cavity 30 is connected to the carbon canister 112 through a vent joint (the same as the "vent joint" described below), and the second cavity 31 is connected to the fuel tank 111 through a through hole 11 (the same as the "through hole 11" described below). The first cavity 30 and the second cavity 31 are connected or isolated by the valve assembly 21, thereby forming a gas flow channel, that is, fuel tank 111 / carbon canister 112→through hole 11 / vent joint 22→second cavity 31 / first cavity 30→valve assembly 21→first cavity 30 / second cavity 31→vent joint 22 / through hole 11→carbon canister 112 / fuel tank 111.

[0047] In one embodiment, if Figure 3 and Figure 4 As shown, the valve assembly 21 includes a first valve seat 4, and a first opening 40 is provided on the first valve seat 4. The first opening 40 enables the first cavity 30 to communicate with the second cavity 31. The valve assembly 21 also includes a first valve disc 5, and the diameter of the first valve disc 5 is designed to be greater than or equal to the diameter of the first opening 40, so that when the first valve disc 5 abuts against the first valve seat 4, the first opening 40 can be blocked, that is, the first cavity 30 and the second cavity 31 are isolated. According to the requirements of the working conditions, the first valve disc 5 can abut against the first valve seat 4 or be away from the first valve seat 4 to achieve the isolation or communication between the first cavity 30 and the second cavity 31, so as to meet different working conditions.

[0048] In some embodiments, Figure 3 and Figure 4As shown, the valve assembly 21 also includes an electric element 6 and a first elastic element 51. The first valve disc 5 has an open state and a closed state. The "open state" refers to that the first valve disc 5 is separated from the first valve seat 4 under the drive of the electric element 6 or the internal pressure of the oil tank 111. At this time, the first opening 40 makes the first cavity 30 connected with the second cavity 31; the "closed state" refers to that when there is no power or oil pressure, the first elastic element 51 is in a pre-tightened state, pressing the first valve disc 5 on the first valve seat 4, blocking the first opening 40, so that the first cavity 30 is isolated from the second cavity 31; the electric element 6 can drive the first valve disc 5 to switch between the open state and the closed state, that is, the electric element 6 can drive the first valve disc 5 to move in the direction close to the first valve seat 4 and the direction away from the first valve seat 4, so that the first valve disc 5 is against the first valve seat 4 or separated from the first valve seat 4, so as to realize the connection and disconnection of the first cavity 30 and the second cavity 31.

[0049] In one embodiment, if Figure 6 and Figure 7 As shown, the valve assembly 21 further includes a second valve disc 8 and a second elastic member 80. The second valve disc 8 is arranged at the first opening 40 and close to the side of the second cavity 31. The second valve disc 8 is arranged in close contact with the first valve disc 5. In the figure, the first valve disc 5 is in close contact with the second valve disc 8 and the first valve disc 5 is located on the right side of the second valve disc 8. When the second valve disc 8 is in close contact with the first valve disc 5, the first cavity 30 and the second cavity 31 are in an isolated state. However, the second valve disc 8 and the first valve disc 5 are also separated. The first valve disc 5 is provided with a valve hole 50. The diameter of the second valve disc 8 is smaller than the diameter of the first opening 40, but larger than the maximum diameter of the valve hole 50, so that the second valve disc 8 can block the valve hole 50. When the second valve disc 8 is separated from the first valve disc 5, the valve hole 50 on the first valve disc 5 cooperates with the first opening 40 to become a passage connecting the first cavity 30 and the second cavity 31, so that the first cavity 30 and the second cavity 31 are in a connected state.

[0050] When the gas pressure in the oil tank 111 is greater than the positive pressure opening pressure of the exhaust valve 110, under the action of the air pressure, the first valve plate 5 overcomes the elastic force of the first elastic element 51 and reaches the open state. At this time, the second valve plate 8, under the action of the second elastic element 80, fits with the first valve plate 5 and moves with the first valve plate 5 in the direction away from the second cavity 31. The first opening 40 connects the first cavity 30 with the second cavity 31, and the gas in the oil tank 111 is discharged from the oil tank 111 into the atmosphere through the exhaust valve 110. When the pressure of the oil tank 111 reaches the negative pressure opening pressure of the exhaust valve 110, the second valve plate 8 overcomes the elastic force of the second elastic element 80 and reaches the open state. The "open state" here refers to the state when the oil tank 111 pressure reaches the negative pressure opening pressure of the exhaust valve 110. Figure 7As shown, the second valve disc 8 moves to the left, that is, moves toward the direction close to the second cavity 31, and the second valve disc 8 is separated from the first valve disc 5. At this time, the second opening 41 is connected with the air hole 70 through the valve hole 50, so that the oil tank 111 can be replenished with air through the valve assembly 21. When active air pressure balance is required, the first valve disc 5 moves in the direction away from the second cavity 31 under the drive of the electric element 6 and separates from the second valve disc 8, so that the first cavity 30 and the second cavity 31 are connected through the first opening 40 and the second opening 41, thereby performing air pressure balance.

[0051] In one embodiment, if Figure 2-Figure 7 As shown, the valve assembly 21 also includes a valve housing 7, a first valve plate 5, a first valve seat 4, a second valve plate 8 and an electric element 6 (the electric element 6 includes a winding group 60, a static iron core 61 and a moving iron core 62) are accommodated in the valve housing 7, and an air hole 70 is opened on the valve housing 7. The air hole 70 can connect the interior of the valve housing 7 with the first cavity 30, so that the gas passing through the interior of the valve housing 7 is discharged into the first cavity 30 through the air hole 70, and then enters the carbon canister 112, completing the closed loop of the gas passage.

[0052] In the prior art, the more windings the valve assembly 21 has, the larger the size of the winding group 60 is, and the larger the volume of the valve assembly 21 is. The valve assembly 21 of the existing oil tank isolation valve 2 is relatively large, with a diameter usually between 35-60 mm and a height usually between 80-110 mm, and cannot be directly integrated into the first flange 1. The embodiment of the utility model reduces the number of windings of the valve assembly 21 and increases the working current to achieve miniaturization of the valve assembly 21, so that the diameter of the valve assembly 21 is limited to less than 30 mm and the height is limited to less than 60 mm, thereby achieving an integrated solution. According to the arrangement position of the valve assembly 21 in actual work, the projection of the valve housing 7 on the first flange 1 is a rectangle, the length of the rectangle is less than 60 mm, and the width of the rectangle is less than 30 mm.

[0053] In other embodiments, the valve assembly 21 may not include the valve housing 7, and components such as the first valve plate 5, the first valve seat 4, the second valve plate 8 and the electric element 6 may be directly accommodated in the first cavity 30, and the connection and disconnection of the first cavity 30 and the second cavity 31 are realized by the opening and closing states of the first valve plate 5 and the second valve plate 8.

[0054] In one embodiment, if Figure 5As shown, the valve assembly 21 also includes a second valve seat (not shown in the figure) and a third valve disc 9. In this embodiment, there is no second valve disc 8. A third opening (not shown in the figure) is provided on the second valve seat. The third opening connects the first cavity 30 and the second cavity 31. The diameter of the third valve disc 9 is greater than or equal to the diameter of the third opening. The third valve disc 9 can block or connect the third opening. The third valve disc 9 is a negative pressure valve disc. When the pressure in the oil tank 111 is lower than the opening pressure of the third valve disc 9, the oil tank 111 needs to be supplemented with gas from the outside atmosphere. The third valve disc 9 is separated from the second valve seat, and the gas from the third opening enters the oil tank 111 through the exhaust valve 110. The specific flow process of the gas entering the oil tank 111 from the exhaust valve 110 is as follows: the gas enters the first cavity 30, enters the second cavity 31 through the third opening, and finally enters the oil tank 111.

[0055] In one embodiment, the fuel tank isolation valve 2 further includes a vent connector 22, which is suitable for connecting the carbon canister 112 and the first chamber 30. Figure 2 and Figure 8 As shown, one end of the vent connector 22 is connected to the carbon canister 112 through a pipeline, and the other end of the vent connector 22 is arranged on the fuel tank isolation valve 2 and connected to the first cavity 30 in the fuel tank isolation valve 2, so as to form a connection between the carbon canister 112 and the first cavity 30. The outer plate 10 is provided with a through hole 11, and the through hole 11 is suitable for connecting the fuel tank 111 with the second cavity 31. Specifically, the outer plate 10 is provided with a through hole 11 directly connected to the inside of the fuel tank 111, and the through hole 11 is also connected to the second cavity 31 of the fuel tank isolation valve 2, so as to form a connection between the inside of the fuel tank 111 and the second cavity 31.

[0056] In some embodiments, the working voltage of the exhaust valve 110 is a variable voltage, because the more windings, the greater the resistance and the smaller the current. The current of the prior art is generally below 1A or around 1A. In the embodiment of the utility model, in order to integrate the oil tank isolation valve 2 into the first flange 1, the winding of the valve assembly 21 of the oil tank isolation valve 2 is reduced, and the size of the winding group 60 will become smaller. The fewer windings, the smaller the resistance and the larger the current, which is currently above 1A. As the working current increases, the heat generated by the oil tank isolation valve 2 will increase. In view of this situation, the working voltage of the exhaust valve 110 is designed to be a variable voltage, which is solved by controlling the exhaust valve 110 in stages.

[0057] In some embodiments, the working opening voltage of the exhaust valve 110 is greater than the working voltage after the exhaust valve 110 is opened. Specifically, at the moment when the valve assembly 21 is opened, the oil tank isolation valve 2 needs to overcome the pressure of the oil tank 111. At this time, the rated voltage is given to make the electromagnetic force F of the solenoid valve reach the maximum state; when the valve assembly 21 is opened and reaches the holding state, the electromagnetic force F required to be provided at this time is reduced. At the same time, due to the reduction of the air gap of the oil tank isolation valve 2, the electromagnetic force F is greater under the same voltage. At this time, a low voltage, such as 50% of the rated voltage, can be used to keep the valve assembly 21 in the open state. When the voltage is reduced, the current is reduced, and the corresponding heating problem is solved. It is worth noting that the "50% rated voltage" here is just an example, and the specific design is adjusted according to the demand for electromagnetic force F. According to the following formula, the electromagnetic force F is proportional to the number of windings N and the current I. The prior art is to achieve the required electromagnetic force by a larger N value and a smaller current I, while keeping the power at a smaller level; the embodiment of the utility model is to achieve the required electromagnetic force F by a smaller number of windings N and a larger current, and the increase in current brings about an increase in power and an increase in heat generation. Specifically:

[0058]

[0059] μ0—air gap magnetic permeability, usually the magnetic permeability of air 4π×10^-7 (H / m);

[0060] S0—effective cross-sectional area (mm2);

[0061] I—current (A)

[0062] N—number of winding coils;

[0063] d—enameled wire diameter (mm);

[0064] U—input voltage (V);

[0065] δ—air gap length (m).

[0066] The present application also provides a fuel supply system 100 , comprising the above-mentioned exhaust valve 110 .

[0067] In one embodiment, if Figure 8As shown, the fuel supply system 100 also includes a control module 114. When the control module 114 receives the command to open the exhaust valve 110, it controls the fuel tank isolation valve 2 to open, so that the second cavity 31 is connected to the first cavity 30, and the gas in the fuel tank 111 can be discharged through the exhaust valve 110, leading to the carbon canister 112, and finally discharged into the atmosphere. The specific process is as follows: when the control module 114 recognizes the refueling command, it sends an opening command to the exhaust valve 110 and provides the rated working voltage, and the exhaust valve 110 is opened. When the exhaust valve 110 is fully opened, the voltage provided by the control module 114 decreases, for example, to 50%. At this time, due to the reduction of the air gap δ between the moving iron core 62 and the static iron core 61 of the valve assembly 21, the electromagnetic force is greater under the same voltage, so 50% of the rated voltage can keep the electromagnetic valve in the open state. Similarly, the "50% rated voltage" here is just an example like the above-mentioned "50% rated voltage". The specific design is adjusted according to the demand for electromagnetic force. The calculation of electromagnetic force is the same as above, and it will not be repeated here.

[0068] The present application also provides a vehicle, comprising the above-mentioned fuel supply system 100.

[0069] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of this application. The terms used herein are only for describing specific implementation purposes and are not intended to limit this application. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0070] The present application has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present application to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the present application, and these variations and modifications all fall within the scope of protection claimed in the present application.

Claims

1. An exhaust valve, characterized in that: The exhaust valve comprises: A first flange, wherein the first flange is suitable for fixing the oil pump on the oil tank, the first flange is suitable for connecting with the oil tank and at least a part of the structure is located outside the oil tank; A fuel tank isolation valve, wherein the fuel tank isolation valve is disposed on the first flange and is located outside the fuel tank; The exhaust valve is suitable for connecting the carbon canister and the oil tank.

2. The exhaust valve according to claim 1, characterized in that: Part of the structure of the first flange is formed as a part of the tank isolation valve.

3. The exhaust valve according to claim 2, characterized in that: The first flange has an outer plate, which is suitable for being arranged outside the oil tank. The oil tank isolation valve comprises a first shell and a valve assembly, which is arranged in the first shell. The outer plate forms a part of the first shell.

4. The exhaust valve according to claim 3, characterized in that: A cavity is formed in the first shell, and the cavity is divided into a first cavity and a second cavity. The first cavity is suitable for communicating with the carbon canister, and the second cavity is suitable for communicating with the fuel tank. The valve assembly can connect or isolate the first cavity and the second cavity.

5. The exhaust valve according to claim 4, characterized in that: The valve assembly includes a first valve plate and a first valve seat. The first valve seat is provided with a first opening. The first opening connects the first cavity and the second cavity. The diameter of the first valve plate is greater than or equal to the diameter of the first opening. The first valve plate can block or connect the first opening.

6. The exhaust valve according to claim 5, characterized in that The valve assembly also includes an electric element, and the first valve plate has an open state and a closed state. In the open state, the first cavity is connected to the second cavity, and in the closed state, the first cavity is isolated from the second cavity; the electric element can drive the first valve plate to switch between the open state and the closed state.

7. The exhaust valve according to claim 6, characterized in that The valve assembly further includes a second valve sheet, which is disposed at the first opening and close to one side of the second cavity, and the second valve sheet is disposed in close contact with the first valve sheet.

8. The exhaust valve according to claim 7, characterized in that: The first valve plate is provided with a valve hole, the diameter of the second valve plate is smaller than the diameter of the first opening, and the second valve plate can block the valve hole.

9. The exhaust valve according to claim 8, characterized in that The diameter of the second valve plate is greater than the maximum diameter of the valve hole.

10. The exhaust valve according to claim 7 or 9, characterized in that: The valve assembly also includes a valve housing, in which the first valve plate, the first valve seat, the second valve plate and the electric element are accommodated, and the projection of the valve housing on the first flange is a rectangle, the length of the rectangle is less than 60 mm, and the width of the rectangle is less than 30 mm.

11. The exhaust valve according to claim 6, characterized in that The valve assembly also includes a second valve seat and a third valve plate. The second valve seat is provided with a third opening. The third opening connects the first cavity and the second cavity. The diameter of the third valve plate is greater than or equal to the diameter of the third opening. The third valve plate can block or connect the third opening.

12. The exhaust valve according to claim 6, 9 or 11, characterized in that: The fuel tank isolation valve further comprises a vent connector, and the vent connector is suitable for connecting the carbon canister with the first cavity.

13. The exhaust valve according to claim 12, characterized in that The outer plate is provided with a through hole, and the through hole is suitable for connecting the oil tank and the second cavity.

14. The exhaust valve according to claim 13, characterized in that The working voltage of the exhaust valve is a variable voltage.

15. The exhaust valve according to claim 14, characterized in that The operating opening voltage of the exhaust valve is greater than the operating voltage after the exhaust valve is opened.

16. A fuel supply system, characterized in that: The exhaust valve comprises the exhaust valve according to any one of claims 1 to 14.

17. A vehicle, characterized in that: Includes the fuel supply system as claimed in claim 16.

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