Leakage diagnosis device, fuel tank leakage diagnosis system, and vehicle

Abstract

The present application provides a leakage diagnosis device, a fuel tank leakage diagnosis system and a vehicle. The leakage diagnosis device includes a body. The body includes a housing, a first chamber, a gas supplement valve and a motion mechanism. The housing is provided with a first opening for connecting to a gas pumping device and a second opening for connecting to a device to be diagnosed. The first chamber is arranged in the housing and communicated with the first opening. The gas supplement valve is used for communicating the second opening with the atmosphere. The motion mechanism is located in the housing and can move in the housing to control the opening and closing of the gas supplement valve. The fuel tank leakage diagnosis system includes the leakage diagnosis device. The vehicle includes the fuel tank leakage diagnosis system.

Description

Technical Field

[0001] This application relates to the technical field of leakage diagnosis, and particularly to a leakage diagnosis device, a fuel tank leakage diagnosis system and a vehicle. Background Art

[0002] With the improvement of living standards, automobiles have become common means of transportation. When the fuel tank of an automobile leaks, the gasoline in the fuel tank volatilizes into the air, causing air pollution and being unfavorable to environmental protection. Therefore, it is necessary to detect whether the fuel tank leaks.

[0003] In the prior art, a fuel tank leakage diagnosis system includes an air supply valve for connecting the fuel tank to the atmosphere and a control unit for controlling the closing and opening of the air supply valve. When the control unit controls the air supply valve to open, the air in the atmosphere can enter the fuel tank to balance the internal pressure of the fuel tank. When the control unit controls the air supply valve to close, the gas in the atmosphere cannot enter the fuel tank. It can be seen that the fuel tank leakage diagnosis system in the prior art needs to be provided with a control unit for controlling the air supply valve, and the structure is relatively complex. Summary of the Invention

[0004] This application provides a leakage diagnosis device, a fuel tank leakage diagnosis system and a vehicle.

[0005] According to the first aspect of the embodiments of this application, a leakage diagnosis device is provided. The leakage diagnosis device includes a body; the body includes a housing, a first chamber, an air supply valve and a motion mechanism;

[0006] The housing is provided with a first opening for connecting with a gas pumping device and a second opening for connecting with a device to be diagnosed;

[0007] The first chamber is arranged in the housing and communicates with the first opening;

[0008] The air supply valve is used to connect the second opening with the atmosphere;

[0009] The motion mechanism is located in the housing and can move in the housing to control the opening and closing of the air supply valve.

[0010] In one embodiment, the leakage diagnosis device further includes a control part for controlling the communication or non-communication between the first chamber and the second opening.

[0011] In one embodiment, the control part includes a first interface and a second interface. The first interface communicates with the first chamber, and the second interface communicates with the second opening. The control part controls the communication or non-communication between the first chamber and the second opening by controlling the communication or non-communication between the first interface and the second interface.

[0012] In one embodiment, the leakage diagnosis device further includes a control unit. The main body is further provided with a third opening for communicating the first chamber with the atmosphere, and the size of the third opening is smaller than that of the first opening.

[0013] The control unit is configured to control the communication or non-communication between the first chamber and the third opening.

[0014] In one embodiment, the control unit includes a first interface and a third interface. The first interface communicates with the first chamber, and the third interface communicates with the third opening. The control unit controls the communication or non-communication between the first chamber and the third opening by controlling the communication or non-communication between the first interface and the third interface.

[0015] In one embodiment, the main body further includes a first baffle, a second baffle, and a third baffle that are arranged in sequence from top to bottom within the housing. The first baffle, the second baffle, and the wall of the housing enclose to form the first chamber. The third baffle, the second baffle, and the wall of the housing enclose to form a second chamber. The second opening communicates with the second chamber. The control unit controls the communication or non-communication between the first chamber and the second opening by controlling the communication or non-communication between the second chamber and the first opening.

[0016] In one embodiment, the air replenishing valve includes a connecting rod, a fourth opening provided on the third baffle, a blocking portion located below the third baffle, and a first elastic member located between the blocking portion and the wall of the housing below. The blocking portion is connected to the connecting rod. The connecting rod penetrates through the third baffle and the second baffle and can move up and down. The fourth opening communicates the second chamber with the atmosphere.

[0017] The first baffle is a flexible plate, and the motion mechanism is located above the first baffle. When the pressure in the first chamber increases, the gas in the first chamber pushes the middle region of the first baffle in a direction away from the second baffle. The first elastic member stretches and pushes the blocking portion and the connecting rod upward, and the blocking portion blocks the fourth opening. When the motion mechanism moves downward, it pushes the connecting rod downward, and the connecting rod drives the blocking portion downward, compressing the first elastic member.

[0018] In one embodiment, the main body further includes a first baffle and a second baffle that are arranged in sequence from top to bottom within the housing. The first baffle, the second baffle, and the wall of the housing enclose to form the first chamber. The first baffle is a flexible plate. The motion mechanism is located above the first baffle.

[0019] The motion mechanism includes a main body portion and a second elastic member. The main body further includes a pressure sensor disposed within the housing. The pressure sensor is disposed above the first baffle. The pressure sensor detects the force exerted on it by the second elastic member. One end of the second elastic member abuts against the main body portion, and the other end abuts against the pressure sensor. One of the pressure sensor and the main body portion abuts against the housing, and the other abuts against the first baffle.

[0020] When the pressure in the first chamber increases, the gas in the first chamber pushes the middle region of the first baffle in a direction away from the second baffle, the second elastic member is compressed, and the force exerted by the second elastic member on the pressure sensor increases. When the pressure in the first chamber decreases, the middle region of the first baffle moves in a direction closer to the second baffle, the second elastic member expands, and the force exerted by the second elastic member on the pressure sensor decreases.

[0021] In one embodiment, the motion mechanism includes a main body portion and a second elastic member. The main body portion includes a sleeve, a turntable, a central rod, a support seat, and a limiting block.

[0022] The sleeve is fixed above the first baffle. The lower part of the inner wall of the sleeve is provided with a limiting groove and a protruding portion located between adjacent limiting grooves. The top of the protruding portion is provided with a first guiding surface and a stop portion adjacent to the first guiding surface. The top of the stop portion is provided with a second guiding surface, and the second guiding surface is located above the first guiding surface. The turntable can move up and down within the sleeve, and the outer wall of the turntable is provided with a rib. The support seat abuts against the upper end of the turntable. The lower end of the second elastic member abuts against the support seat, and the upper end abuts directly or indirectly against the housing. The limiting block is located above the bottom wall of the support seat and is connected to the central rod. The central rod passes through the turntable, and the upper and lower ends of the central rod respectively protrude out of the sleeve. The outer wall of the central rod is provided with a pushing portion and a convex block located outside the pushing portion. The turntable is located above the pushing portion.

[0023] In the initial state, the convex block and the rib are respectively located within the limiting groove. The first baffle abuts against the second baffle, the lower end of the central rod abuts against the first baffle, and the fourth opening is not blocked by the blocking portion.

[0024] When the pressure in the first chamber increases, the middle part of the first baffle moves upward, pushing the central rod upward. The pushing part pushes the turntable and the support seat upward, and the second elastic member is compressed. The blocking part moves upward to block the fourth opening. After the convex rib separates from the limiting groove, the acting force of the second elastic member on the turntable causes the turntable to rotate. After the turntable rotates, the convex rib and the first guiding surface are longitudinally corresponding.

[0025] When the pressure in the first chamber decreases, the middle part of the first baffle moves downward, and the central rod and the turntable move downward. After the convex rib abuts against the first guiding surface, the acting force of the second elastic member on the turntable causes the convex rib to move along the first guiding surface until it abuts against the blocking part. When the central rod continues to move downward until the limiting block abuts against the support seat, the lower end of the central rod does not exert a force on the connecting rod.

[0026] When the pressure in the first chamber increases again, the central rod, the turntable and the support seat move upward, and the second elastic member is compressed. During the upward movement of the turntable, the acting force of the second elastic member on the turntable causes the turntable to move. After the turntable rotates, the convex rib and the second guiding surface are longitudinally corresponding.

[0027] When the pressure in the first chamber decreases again, the central rod and the turntable move downward. After the convex rib abuts against the second guiding surface, the acting force of the second elastic member on the turntable causes the convex rib to move along the second guiding surface and enter the limiting groove adjacent to the second guiding surface. Then the central rod continues to move downward and pushes the first baffle to move until it abuts against the second baffle.

[0028] In one embodiment, a first meshing tooth structure is provided at the top end of the pushing part, and a second meshing tooth structure that can mesh with the first meshing tooth structure is provided at the bottom of the turntable.

[0029] In the initial state, the first meshing tooth structure and the second meshing tooth structure are not meshed.

[0030] When the convex rib separates from the limiting groove and the convex rib abuts against the blocking part, under the acting force of the second elastic member on the turntable and the cooperation of the meshing tooth structure and the second meshing tooth structure, the turntable rotates, and then the first meshing tooth structure and the second meshing tooth structure are meshed.

[0031] According to the second aspect of the embodiments of the present application, a fuel tank leakage diagnosis system is provided, including a fuel tank, a gas pumping device and the above leakage diagnosis device. The gas pumping device is connected to the first opening, and the fuel tank is connected to the second opening.

[0032] According to a third aspect of the embodiments of the present application, a vehicle is provided, including the above-mentioned fuel tank leakage diagnosis system.

[0033] For the leakage diagnosis device, fuel tank leakage diagnosis system and vehicle provided by the embodiments of the present application, when controlling the first chamber and the second opening to be not in communication, the air pumping device pumps air into the first chamber through the first opening, and it can be determined whether there is a leakage beyond the allowable range in the first chamber; when controlling the first chamber and the second opening to be in communication, the air pumping device pumps air into the first chamber and the device to be diagnosed simultaneously, and it can be determined whether there is a leakage beyond the allowable range in the device to be diagnosed; the movement mechanism arranged in the housing can control the opening and closing of the air supplement valve, so that the leakage diagnosis device does not need to be provided with a control member for controlling the air supplement valve, which helps to simplify the structural complexity of the leakage diagnosis device.

[0034] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present application, and are used together with the description to explain the principles of the present application.

[0036] Figure 1 A three-dimensional structure diagram of a leakage diagnosis device provided for an exemplary embodiment of the present application;

[0037] Figure 2 For Figure 1 A three-dimensional structure diagram of the leakage diagnosis device shown in a cut-open state;

[0038] Figure 3 For Figure 1 A partial cross-sectional view of the leakage diagnosis device shown in a state;

[0039] Figure 4 A three-dimensional structure diagram of a sleeve provided for an exemplary embodiment of the present application;

[0040] Figure 5 A three-dimensional structure diagram of a turntable provided for an exemplary embodiment of the present application;

[0041] Figure 6 A three-dimensional structure diagram of a central rod provided for an exemplary embodiment of the present application;

[0042] Figure 7 A partially cut-open three-dimensional structure diagram of a movement mechanism provided for an exemplary embodiment of the present application in a state;

[0043] Figure 8A schematic perspective view of a partially cut-away state of a motion mechanism provided by an exemplary embodiment of the present application;

[0044] Figure 9 A schematic perspective view of a partially cut-away state of a motion mechanism provided by another exemplary embodiment of the present application;

[0045] Figure 10 is Figure 1 A partial cross-sectional view of the leakage diagnosis device shown in another state;

[0046] Figure 11 is Figure 1 A partial cross-sectional view of the leakage diagnosis device shown in yet another state;

[0047] Figure 12 A schematic perspective view of a partially cut-away state of a motion mechanism provided by yet another exemplary embodiment of the present application;

[0048] Figure 13 A cross-sectional view of a motion mechanism provided by an exemplary embodiment of the present application in Figure 12 the state shown;

[0049] Figure 14 is Figure 1 A partial cross-sectional view of the leakage diagnosis device shown in yet another state;

[0050] Figure 15 A schematic perspective view of a partially cut-away state of a motion mechanism provided by yet another exemplary embodiment of the present application;

[0051] Figure 16 A schematic perspective view of a partially cut-away state of a motion mechanism provided by yet another exemplary embodiment of the present application. Detailed Description of the Embodiment

[0052] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0053] The terms used in the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "the", and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0054] It should be understood that the terms "first", "second" and similar terms used in the specification and claims of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. Unless otherwise indicated, terms such as "front part", "rear part", "lower part" and / or "upper part" are only for convenience of description and are not limited to a position or a spatial orientation. The terms "comprising" or "including" and similar terms mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items.

[0055] The leakage diagnosis device, fuel tank leakage diagnosis system and vehicle according to the embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the features in the following embodiments and implementation manners can be mutually supplemented or combined.

[0056] The embodiments of the present application provide a leakage diagnosis device. Refer to Figure 1 And Figure 2 , the leakage diagnosis device 100 includes a body 10. The body 10 includes a housing 11, a first chamber 121, a gas replenishing valve 13 and a motion mechanism 14.

[0057] The housing 11 is provided with a first opening 111 for connecting with a gas pumping device and a second opening 112 for connecting with a device to be diagnosed. The first chamber 121 is arranged inside the housing 11 and is communicated with the first opening 111. The gas replenishing valve 13 is used to communicate the second opening 112 with the atmosphere. The motion mechanism 14 is located inside the housing 11 and can move inside the housing 11 to control the opening and closing of the gas replenishing valve 13. Among them, when the motion mechanism 14 moves inside the housing 11, it can be that the whole motion mechanism 14 moves, or a part of the motion mechanism 14 moves inside the housing 11.

[0058] For the leakage diagnosis device provided by the embodiments of the present application, when it is controlled that the first chamber 121 is not communicated with the second opening 112, the gas pumping device pumps gas into the first chamber 121 through the first opening 111, and it can be judged whether there is a leakage beyond the allowable range in the first chamber 121; when it is controlled that the first chamber 121 is communicated with the second opening 112, the gas pumping device pumps gas into the first chamber 121 and the device to be diagnosed at the same time, and it can be judged whether there is a leakage beyond the allowable range in the device to be diagnosed; the motion mechanism 14 arranged inside the housing 11 can control the opening and closing of the gas replenishing valve 13, so that the leakage diagnosis device does not need to be provided with a control member for controlling the gas replenishing valve 13, which helps to simplify the structural complexity of the leakage diagnosis device.

[0059] It should be noted that the first chamber 121 and the device to be diagnosed are generally not absolutely sealed, and a small amount of leakage is allowed. However, when the leakage amount is large and exceeds the allowable range, it is not allowed. Therefore, it is necessary to detect the first chamber 121 and the device to be diagnosed.

[0060] In one embodiment, the body 10 further includes a first baffle 171, a second baffle 172, and a third baffle 173 that are arranged in sequence from top to bottom within the housing 11, and both ends of the first baffle 171, the second baffle 172, and the third baffle 173 are connected to the housing. The first baffle 171, the second baffle 172, and the wall of the housing 11 enclose to form the first chamber 121, the third baffle 173, the second baffle 172, and the wall of the housing 11 enclose to form a second chamber 122, and the third baffle 173 and the side wall and bottom wall of the housing 11 enclose to form a third chamber 123. The second opening 112 communicates with the second chamber 122. The housing 11 is further provided with a fifth opening 115 and a sixth opening 116. The fifth opening 115 communicates the third chamber 123 with the atmosphere, and the sixth opening 116 communicates with the second chamber 122.

[0061] In one embodiment, the leakage diagnosis device further includes a control unit 20, and the control unit 20 is used to control the connection or disconnection between the first chamber 121 and the second opening 112. When the control unit 20 controls the first chamber 121 and the second opening 112 to be disconnected, the air pumping device pumps air into the first chamber 121 through the first opening 111, and it can be determined whether there is leakage in the first chamber 121 that exceeds the allowable range; when the control unit 20 controls the first chamber 121 and the second opening 112 to be connected, air can be pumped into the device to be diagnosed through the second opening 112 to determine whether there is leakage in the device to be diagnosed that exceeds the allowable range.

[0062] In one embodiment, the control unit 20 includes a first interface 21 and a second interface 22. The first interface 21 communicates with the first chamber 121, and the second interface 22 communicates with the second opening 112. The control unit 20 controls the communication or non-communication between the first chamber 121 and the second opening 112 by controlling the communication or non-communication between the first interface 21 and the second interface 22. The first interface 21 can communicate with the first chamber 121 through a pipeline 42, a pipeline 41, and a first opening 111. The second interface 22 can communicate with the second opening 112 through a pipeline 43, a sixth opening 116, and a second chamber 122. The control unit 20 controls the communication or non-communication between the second chamber 122 and the first opening 111 by controlling the communication or non-communication between the first interface 21 and the second interface 22, and further controls the communication or non-communication between the first chamber 121 and the second opening 112. When the control unit 20 controls the first interface 21 to communicate with the second interface 22, the second chamber 122 communicates with the first opening 111, then the second opening 112 communicates with the first chamber 121, that is, the system to be diagnosed communicates with the first chamber 121. When the control unit 20 controls the first interface 21 not to communicate with the second interface 22, the second chamber 122 does not communicate with the first opening 111, then the second opening 112 does not communicate with the first opening 111, that is, the system to be diagnosed does not communicate with the first chamber 121.

[0063] In one embodiment, the body 10 is further provided with a third opening for communicating the first chamber 121 with the atmosphere. The size of the third opening is smaller than the size of the first opening 111. The control unit 20 is further configured to control the communication or non-communication between the first chamber 121 and the third opening. When the control unit 20 controls the first chamber 121 to communicate with the third opening, the gas in the first chamber 121 can flow out through the third opening.

[0064] In one embodiment, the control unit 20 further includes a third interface 23 that communicates with the third opening. The control unit 20 controls the communication or non-communication between the first chamber 121 and the third opening by controlling the communication or non-communication between the first interface 21 and the third interface 23. When the control unit 20 controls the first interface 21 to communicate with the third interface 23, since the first interface 21 communicates with the first chamber 121 and the third interface 23 communicates with the atmosphere, the first chamber 121 communicates with the atmosphere in sequence through the first opening 111, the first interface 21, the third interface 23, and the third opening.

[0065] In the embodiment of the present application, when the control unit 20 controls the first interface 21 to communicate with the third interface 23, it controls the second interface 22 not to communicate with the first interface 21; when the control unit 20 controls the second interface 22 to communicate with the first interface 21, it controls the first interface 21 not to communicate with the third interface 23. That is, one of the first interface 21 and the third interface 23, and the second interface 22 and the first interface 21 is in communication, and the other is not in communication.

[0066] When using the leakage diagnosis device provided by the embodiment of the present application to determine whether there is a leakage beyond the allowable range in the device to be diagnosed, first determine whether there is a leakage amount beyond the allowable range in the first chamber 121. When determining whether there is a leakage amount beyond the allowable range in the first chamber 121, the control unit 20 controls the first interface 21 to communicate with the third interface 23, the first interface 21 does not communicate with the second interface 22, and the air supply valve is closed. When it is determined that there is no leakage amount beyond the allowable range in the first chamber 121, detect whether there is a leakage in the device to be diagnosed. At this time, the control unit 20 controls the first interface 21 not to communicate with the third interface 23, the first interface 21 communicates with the second interface 22, and the air supply valve is closed. After the detection is completed, control the first interface 21 to communicate with the third interface 23, the first interface 21 does not communicate with the second interface 22, and the air supply valve is opened.

[0067] It can be known from the gas flow characteristics of the gas pumping device that as the pressure in the first chamber increases, the gas flow rate of the gas pumping device pumping gas into the first chamber first increases and then decreases. Since the size of the third opening is smaller than the size of the first opening 111, the flow rate of the gas flowing out through the third opening is slower. When the pressure in the first chamber 121 is relatively small, the gas outflow amount at the third opening is less than the gas pumping amount of the gas pumping device, and the pressure in the first chamber 121 keeps increasing. When the pressure in the first chamber reaches a certain value, the gas flow rate of the gas pumping device pumping gas into the first chamber is the same as the gas flow rate at the third opening, and the pressure in the first chamber reaches the maximum value. When stopping pumping gas into the first chamber 121, the high-pressure gas in the first chamber 121 can flow out through the third opening, so that the pressure of the gas in the first chamber 121 decreases. By setting the third opening, the gas in the first chamber 121 can be communicated with the atmosphere.

[0068] In one embodiment, the main body 10 is further provided with a pipeline 15. One end of the pipeline 15 extends to the outside of the housing 11 and communicates with the third interface 23 through the pipeline 44. The other end of the pipeline 15 penetrates through the third baffle 173 and extends into the third chamber 123. The opening at the end of the pipeline 15 extending into the third chamber 123 is the third opening. In one embodiment, the inner diameter of each part of the pipeline 15 can be the same and is the same as the diameter of the third opening.

[0069] In one embodiment, the diameter of the third opening is less than or equal to 1 mm.

[0070] In some embodiments, the pipeline 41, the pipeline 42 and the gas pumping device can be connected through a tee. The gas pumping device can pump gas into the first chamber 121 through the pipeline 41 and the first opening 111. A part of the gas pumped into the first chamber 121 flows into the atmosphere successively through the pipeline 42, the first interface 21, the third interface 23, the pipeline 44 and the pipeline 15.

[0071] In other embodiments, a seventh opening communicating with the first chamber 121 can be provided on the housing 11, and the pipeline 42 can be directly communicated with the seventh opening.

[0072] In one embodiment, the leakage diagnosis device further includes a controller. The control unit 20 is signal-connected to the controller. The controller sends a control signal to the control unit 20, and the control unit 20 controls the first interface 21 to be connected or disconnected from the second interface 22 according to the control signal, and controls the second interface 22 to be connected or disconnected from the first interface 21. The controller can be an ECU (Electronic Control Unit).

[0073] In some embodiments, the control unit 20 can be a solenoid valve, for example, a two-position three-way solenoid valve. For example, when the solenoid valve is energized, the first interface 21 is connected to the second interface 22, and the first interface 21 is not connected to the third interface 23; when the solenoid valve is de-energized, the first interface 21 is not connected to the second interface 22, and the first interface 21 is connected to the third interface 23.

[0074] In one embodiment, the first baffle 171 is a flexible plate, and the moving mechanism 14 is located above the first baffle 171. Both ends of the first baffle 171 can be connected to the housing 11 through a snap structure. There can be a certain distance between both ends of the first baffle 171 and the second baffle 172. The body 10 may further include a fourth baffle 174. The fourth baffle 174 is partially located above the first baffle 171, and its edge is covered by the first baffle 171. The fourth baffle 174 is a rigid plate. When the gas pressure in the first chamber 121 increases, the first baffle 171 pushes the moving mechanism 14 to move upward through the fourth baffle 174. The fourth baffle 174 can make the force on the middle area of the first baffle 171 more uniform and facilitate the connection between the lower end of the moving mechanism 14 and the fourth baffle 174.

[0075] In one embodiment, referring to Figure 3 , the air replenishing valve 13 includes a connecting rod 133, a fourth opening 131 provided on the third baffle 173, a blocking portion 132 located below the third baffle 173, and a first elastic member 134 located between the blocking portion 132 and the wall of the housing 11 below. The blocking portion 132 is connected to the connecting rod 133, and the connecting rod 133 passes through the third baffle 173 and the second baffle 172 and can move up and down.

[0076] See again Figure 3 When no gas is filled into the first chamber 121, the moving mechanism 14 applies a downward force to the first baffle 171, and the middle region of the first baffle 171 is in direct contact with the second baffle 172. Due to the downward force applied by the moving mechanism 14 to the connecting rod 133 through the first baffle 171, the first elastic member 134 is compressed, and the blocking portion 132 does not block the fourth opening 131.

[0077] When the pressure in the first chamber 121 increases, the gas in the first chamber 121 pushes the middle region of the first baffle 171 to move away from the second baffle 172. The first elastic member 134 expands and pushes the blocking portion 132 and the connecting rod 133 to move upward, and the blocking portion 132 blocks the fourth opening 131. When the pressure in the first chamber 121 decreases, when the first baffle 171 and the moving mechanism 14 move downward, they push the connecting rod 133 to move downward. The connecting rod 133 drives the blocking portion 132 to move downward, the first elastic member 134 is compressed, and the fourth opening 131 connects the second chamber 122 with the atmosphere.

[0078] By setting the first baffle 171 as a flexible plate, with the change of the gas in the first chamber 121, the first baffle 171 can move upward or downward, thereby driving the moving mechanism 14 to move upward or downward. The upward or downward movement of the moving mechanism can cause the blocking portion 132 to move upward or downward, realizing the opening or blocking of the fourth opening 131. By setting the first elastic member 134, when the moving mechanism 14 moves upward, the expansion of the first elastic member 134 can drive the blocking portion 132 to move upward to block the fourth opening 131, avoiding the situation where the blocking portion 132 cannot move upward smoothly and the fourth opening 131 cannot be blocked.

[0079] In some embodiments, a sealing gasket 1321 is provided on one side of the blocking portion 132 close to the third baffle 173. The sealing gasket 1321 can improve the sealing performance between the blocking portion 132 and the third baffle 173, preventing gas from flowing through the gap between the blocking portion 132 and the third baffle 173.

[0080] In some embodiments, the air replenishing valve 13 further includes a mounting seat 135. The mounting seat 135 is located below the blocking portion 132, and the first elastic member 134 is installed on the mounting seat 135. The mounting seat 135 can be integrally formed with the blocking portion 131.

[0081] In some embodiments, the first elastic member 134 is a spring.

[0082] In one embodiment, the second baffle 172 extends downward to form an annular retaining wall 1721, and the connecting rod 133 passes through the annular retaining wall 1721. The annular retaining wall 1721 and the second baffle 172 can be integrally formed. A seal 18 is provided between the annular retaining wall 1721 and the connecting rod 133, and the seal 18 can improve the sealing performance between the first chamber 121 and the second chamber 122. The seal 18 can be an annular sealing ring.

[0083] In one embodiment, the second baffle 172, the third baffle 173 and the housing 11 can be integrally formed.

[0084] In one embodiment, the motion mechanism 14 includes a main body portion 141 and a second elastic member 142. The main body 10 further includes a pressure sensor 16 disposed inside the housing 11. The pressure sensor 16 is disposed above the first baffle 171, and the pressure sensor 16 detects the force exerted on the pressure sensor by the second elastic member 142. One end of the second elastic member 142 abuts against the motion mechanism 14, and the other end abuts against the pressure sensor 141. One of the end of the pressure sensor facing away from the second elastic member 142 and the end of the main body portion facing away from the second elastic member 142 abuts against the housing, and the other abuts against the first baffle. When the pressure in the first chamber 121 increases, the gas in the first chamber 121 pushes the middle region of the first baffle 171 in a direction away from the second baffle 172, the second elastic member 142 is compressed, and the force exerted by the second elastic member 142 on the pressure sensor 16 increases; when the pressure in the first chamber 121 decreases, the middle region of the first baffle 171 moves in a direction close to the second baffle 172, the second elastic member 142 expands, and the force exerted by the second elastic member 142 on the pressure sensor 16 decreases.

[0085] It can be seen that the force exerted by the second elastic member 142 on the pressure sensor 16 is related to the pressure of the gas in the first chamber 121. The gas pressure in the first chamber 121 can be determined according to the pressure detected by the pressure sensor 16. That is, the cooperation between the motion mechanism 14 and the pressure sensor 16 can realize the detection of the gas pressure in the first chamber 121. In other embodiments, a gas pressure sensor can also be disposed in the first chamber 121 to detect the gas pressure in the first chamber 121.

[0086] In one embodiment, the pressure sensor 16 may be fixed on the top wall of the housing 11. The upper end of the second elastic member 142 abuts against the pressure sensor 16, and the lower end abuts against the upper end of the main body portion 141. The lower end of the main body portion 141 abuts against the first baffle 171. When the pressure in the first cavity 121 is different, the distance that the main body portion 141 moves upward is different, so the acting force of the main body portion 141 on the second elastic member 142 is different, the pressure of the second elastic member 142 on the pressure sensor 16 is different, and the pressure value detected by the pressure sensor 16 is different. The pressure magnitude in the first chamber 121 can be determined according to the pressure value detected by the pressure sensor 16.

[0087] In some embodiments, the second elastic member 142 is a spring.

[0088] In one embodiment, referring again to Figure 3 , the main body portion 141 includes a sleeve 143, a turntable 144, a central rod 145, a support seat 146 and a limit block 147.

[0089] The sleeve 143 is fixed above the first baffle 171. An annular portion 19 formed by extending from the inner wall of the housing 11 may be provided in the housing 11, and the annular portion 19 is fixedly connected to the sleeve 143. The housing 11, the annular portion 19 and the sleeve 143 may be integrally formed. The turntable 144 can move up and down in the sleeve 143. The support seat 146 abuts against the upper end of the turntable 144. The second elastic member 142 is mounted on the support seat 146, and its lower end abuts against the bottom wall of the support seat 146, and the upper end of the second elastic member 142 abuts directly or indirectly against the housing 11. The limit block 147 is located above the bottom wall of the support seat 146 and is connected to the central rod 145. The central rod 145 passes through the turntable 144, and the upper end and the lower end of the central rod 145 respectively protrude from the sleeve 143.

[0090] Referring to Figure 4 , a limiting groove 1431 and a protruding portion 1432 located between adjacent limiting grooves 1431 are provided at the lower part of the inner wall of the sleeve 143. A first guiding surface 1434 and a stop portion 1433 adjacent to the first guiding surface 1434 are provided at the top end of the protruding portion 1432. A second guiding surface 1435 is provided at the top of the stop portion 1433, and the second guiding surface 1435 is located above the first guiding surface 1434.

[0091] Referring to Figure 5 , a rib 1441 is provided on the outer wall of the turntable 144, and a plurality of second engagement tooth structures 1442 are provided at the bottom of the turntable 144.

[0092] Referring to Figure 6, a pushing portion 1451 and a convex block 1452 located outside the pushing portion 1451 are provided on the outer wall of the central rod 145, and the pushing portion 1451 can be annular. A first meshing tooth structure 1453 is provided at the top of the pushing portion 1451, and the second meshing tooth structure 1442 can mesh with the first meshing tooth structure 1453. The turntable 144 is located above the pushing portion 1451.

[0093] The number of the convex blocks 1452 of the central rod 145, the ribbed bars 1441 of the turntable 144, and the limiting grooves 1431 of the sleeve 143 can be the same, and the convex blocks 1452 and the limiting grooves 1431 are in one-to-one correspondence, and the ribbed bars 1441 and the limiting grooves 1431 are in one-to-one correspondence.

[0094] See Figure 7 and Figure 8 , in the initial state, that is, before gas is filled into the first cavity 121, the convex block 1452 of the central rod 145 and the ribbed bar 1441 of the turntable 144 are respectively located in the limiting grooves 1431 of the sleeve 143, the convex block 1452 and the corresponding ribbed bar 1441 are in corresponding positions longitudinally, and the first meshing tooth structure 1453 and the second meshing tooth structure 1442 are not meshed. See again Figure 3 , the first baffle 171 abuts against the second baffle 172, the lower end of the central rod 145 abuts against the first baffle 171, and the fourth opening 131 is not blocked by the blocking portion 132.

[0095] After the diagnosis starts, the control unit controls the first interface 21 and the second interface 22 to be not connected, and controls the first interface 21 and the third interface 23 to be connected. The air pumping device starts and pumps air into the first chamber 121, and the pressure in the first chamber 121 increases. When the pressure in the first chamber 121 increases, the middle part of the first baffle 171 moves upward, pushing the central rod 145 to move upward. The pushing portion 1451 pushes the turntable 144 to move upward, the turntable 144 pushes the support seat 146 to move upward, and the second elastic member 142 is compressed. At this time, the first elastic member 134 expands, and the blocking portion 132 moves upward to block the fourth opening 131. When the pressure in the first cavity 121 reaches the maximum value, the moving mechanism 14 moves to the top.

[0096] See Figure 9, during the upward movement of the motion mechanism 14, when the turntable 144 moves above the convex portion 1432, the rib 1441 of the turntable 144 separates from the limiting groove 1431. Since the second elastic member 142 is compressed, the second elastic member 142 exerts a downward force on the turntable 144, and the side walls of the first meshing tooth structure 1453 and the second meshing tooth structure 1442 are inclined planes. Then, the downward force of the second elastic member 142 on the turntable 144 causes the turntable 144 to rotate, enabling the first meshing tooth structure 1453 to mesh with the second meshing tooth structure 1442. After the first meshing tooth structure 1453 meshes with the second meshing tooth structure 1442, that is, after the turntable 144 rotates, the rib 1441 and the convex block 1452 are not longitudinally aligned, and the rib 1441 and the first guiding surface 1434 are longitudinally aligned. After the first meshing tooth structure 1453 meshes with the second meshing tooth structure 1442, the turntable 144 will move downward a small distance as a whole.

[0097] After the motion mechanism 14 rises to the highest point, continue to pump air into the first chamber 121. The gas in the first chamber 121 will continue to increase. When the gas flow rate pumped into the first chamber 121 by the air pumping device is equal to the gas flow rate flowing out through the third opening, the pressure in the first chamber 121 reaches the maximum value. At this time, the leakage diagnosis device is in Figure 10 the state shown. At this time, the pressure in the first chamber 121 can be detected.

[0098] Subsequently, stop pumping air into the first chamber 121. After stopping pumping air into the first chamber 121, since the first chamber 121 is in communication with the atmosphere through the third opening, the gas in the first chamber 121 will leak, and the pressure in the first chamber 121 will decrease until the pressure in the first chamber 121 is the same as the atmospheric pressure. During this process, the main body portion 141 will move downward a certain distance. However, when the pressure in the first chamber 121 is the same as the atmospheric pressure, the central rod 145 does not exert a downward force on the connecting rod 133, and the air replenishing valve 13 remains in the closed state, as Figure 11 shown.

[0099] During the process of the pressure in the first chamber 121 decreasing, the second elastic member stretches, the middle part of the first baffle 171 moves downward, the central rod 145 moves downward, the turntable 144 moves downward. After the rib 1441 abuts against the first guiding surface 1434, the force of the second elastic member 142 on the turntable 144 causes the rib 1441 to move along the first guiding surface 1434 until the rib 1441 abuts against the stopping portion 1433. At this time, the first meshing tooth structure 1453 and the second meshing tooth structure 1442 are not meshed, as Figure 12 shown.

[0100] In some embodiments, in the same protruding portion 1432, the first guiding surface 1434 extends obliquely downward from the side facing away from the stopping portion 1433 to the side adjacent to the stopping portion 1433. Since the turntable 144 is located above the protruding portion 1432 before rotation, and the convex rib 1441 corresponds to the first guiding surface 1434 in the longitudinal direction, after the turntable 144 moves downward, the convex rib 1441 will fall on the first guiding surface 1434. Under the downward acting force exerted by the second elastic member 142 on the turntable 144 and the guiding action of the first guiding surface 1434, the turntable 144 rotates along the first guiding surface 1434 until the convex rib 1441 abuts against the stopping portion 1433. Since the sleeve 143 is fixed in the first chamber 121, after the convex rib 1441 of the turntable 144 abuts against the stopping portion 1433 of the sleeve 143, the turntable 144 cannot continue to move downward, and the support seat 146 also stops moving downward. After the limiting block 147 abuts against the support seat 146, the central rod 145 also stops moving, as Figure 13 shown.

[0101] Subsequently, the control unit controls the first interface and the third interface to close, and the first interface and the second interface to open. The gas pumping device pumps gas into the first chamber 121, and the gas in the first chamber 121 also flows into the device to be diagnosed, and the pressure in the first chamber 121 increases again. When the pressure in the first chamber 121 increases again, the central rod 145, the turntable 144 and the support seat 146 move upward, and the second elastic member 142 is compressed. After the central rod 145 moves to the highest position, continue to pump gas into the first chamber 121, the gas in the first chamber 121 will continue to increase. When the gas flow rate pumped into the first chamber 121 by the gas pumping device is equal to the gas flow rate flowing out through the third opening, the pressure in the first chamber 121 reaches the maximum value, and the leakage diagnosis device is in the state as Figure 14 shown.

[0102] During the upward movement of the turntable 144, the downward acting force exerted by the second elastic member 142 on the turntable 144 causes the turntable 144 to rotate in the first direction, so that the first meshing tooth structure 1453 meshes with the second meshing tooth structure 1442. After the turntable 144 rotates, the convex rib 1441 corresponds to the second guiding surface 1435 in the longitudinal direction, as Figure 15 shown. During this process, the leakage amount between the first chamber 121 and the device to be diagnosed can be detected. By comparing this leakage amount with the leakage amount of the first chamber 121, it can be determined whether the device to be diagnosed has a leakage amount exceeding the allowable range.

[0103] Subsequently, the pumping device is turned off, and the control unit controls the first interface and the second interface to be non - communicating, and the first interface and the third interface to be communicating, so that the pressure in the first chamber 121 decreases again. When the pressure in the first chamber 121 decreases again, the central rod 145 and the turntable 144 move downward. After the convex rib 1441 abuts against the second guiding surface 1435, the acting force of the second elastic member 142 on the turntable 144 causes the turntable 144 to rotate. The convex rib 1441 of the turntable 144 moves along the second guiding surface 1435 and enters the limiting groove 1431 adjacent to the second guiding surface 1435. Thus, the central rod 145 continues to move downward and pushes the first baffle 171 to move until it abuts against the second baffle 172, and the fourth opening 131 is opened. The leakage diagnosis device returns to the initial state as shown in Figure 3 . The atmosphere communicates with the device to be diagnosed through the fourth opening 131 and the second chamber 122 to balance the pressure of the device to be diagnosed.

[0104] In some embodiments, in the same convex portion 1432, the second guiding surface 1435 extends obliquely downward from the side close to the first guiding surface 1434 to the side adjacent to the adjacent limiting groove. Since the turntable 144 is located above the convex portion 1432 before rotation and the convex rib 1441 and the second guiding surface 1435 are longitudinally corresponding, the convex rib 1441 will fall on the second guiding surface 1435 after the turntable 144 moves downward, as shown in Figure 16 . The second guiding surface 1435 guides the turntable 144 to continue rotating until the convex rib 1441 enters the adjacent limiting groove 1431. After the convex rib 1441 enters the limiting groove 1431, the central rod 145, the turntable 144, the support seat 146 and the limiting block 147 continue to move downward until the first baffle 171 abuts against the second baffle 172.

[0105] In the embodiment of the present application, during the process of the motion mechanism from the state shown in Figure 3 to the state shown in Figure 16 , the convex block 1452 of the central rod 145 is always located in the limiting groove 1431 of the sleeve 143, that is, the central rod 145 can only move up and down and cannot rotate.

[0106] In another embodiment, the pressure sensor 16 abuts against the first baffle 171, the lower end of the second elastic member 142 abuts against the pressure sensor 16, the lower end of the main body portion 141 abuts against the upper end of the elastic member 142, and the upper end of the main body portion 141 can abut against the top wall of the housing 11. The main body portion 141 includes a sleeve 143, a turntable 144, a central rod 145, a support seat 146 and a limit block 147. The upper end of the central rod 145 can be fixed to the housing 11. The support seat 146 abuts against the lower end of the turntable 144. That is, rotating the motion mechanism in the illustrated embodiment by 180° gives the position of the motion structure in this embodiment.

[0107] The motion process and principle of the motion mechanism 14 in this embodiment are similar to those in the illustrated embodiment and will not be elaborated here. In the embodiments of the present application, by providing a first meshing tooth structure and a second meshing tooth structure that can mesh with each other, when the convex rib 1441 separates from the limit groove 1431 and the convex rib 1441 abuts against the stop portion 1433, under the action of the second elastic member on the turntable and the guiding of the side walls of the first meshing tooth structure and the second meshing tooth structure, the turntable rotates, and then the first meshing tooth structure and the second meshing tooth structure mesh. In other embodiments, a guiding portion can also be provided on at least one of the opposite ends of the turntable 144 and the pushing portion 1451 to guide the rotation of the turntable 144.

[0108] When using the leakage diagnosis device provided by the embodiments of the present application to diagnose a device to be diagnosed, first connect the air pumping device to the first opening and connect the device to be diagnosed to the second opening.

[0109] Before diagnosis, the leakage diagnosis device is in Figure 3 the state shown. At this time, the air replenishing valve is open.

[0110] When starting the diagnosis, the control unit controls the first interface and the second interface to be non - communicating, and at the same time controls the first interface and the third interface to be communicating, and turns on the air pumping device. The air pumping device injects gas into the first chamber. As the pressure in the first chamber increases, the motion mechanism moves upward, and the air replenishing valve closes during the upward movement of the motion mechanism. When the pressure in the first chamber reaches equilibrium, the leakage diagnosis device is in Figure 4 the state shown. At this time, the pressure detected in the first chamber is the first pressure. Whether there is a leakage beyond the allowable range in the first chamber can be judged according to the pressure in the first chamber. When it is judged that there is no leakage beyond the allowable range in the first chamber, subsequent operation steps are executed.

[0111] Subsequently, turn off the air pumping device. After the motion mechanism moves downward a certain distance and stops, the air replenishing valve is still in the closed state, as shown in Figure 5 the figure.

[0112] Subsequently, the control unit controls the first interface to communicate with the second interface, controls the first interface not to communicate with the third interface, turns on the gas pumping device, and the gas pumping device injects gas into the first chamber again. As the pressure in the first chamber increases, the moving mechanism moves upward, and the air replenishing valve closes during the upward movement of the moving mechanism. Since the first interface communicates with the second interface, the pressure in the device to be diagnosed also continuously increases. After the pressure in the first chamber reaches equilibrium, the leak diagnosis device is in the Figure 6 state shown, and at this time, the pressure in the first chamber is detected as the second pressure. It is determined whether there is a leak beyond the allowable range in the device to be diagnosed according to the magnitude of the second pressure.

[0113] Subsequently, the control unit controls the first interface not to communicate with the second interface, controls the first interface to communicate with the third interface, turns off the gas pumping device, the moving mechanism moves downward until the first baffle abuts against the second baffle, the air replenishing valve opens, and the atmosphere communicates with the device to be diagnosed to balance the pressure of the device to be diagnosed.

[0114] The embodiment of the present application further provides a fuel tank leak diagnosis system. The fuel tank leak diagnosis system includes a fuel tank, a gas pumping device, and the leak diagnosis device according to any one of the above embodiments. The gas pumping device is connected to the first opening, and the fuel tank is connected to the second opening. That is, the device to be diagnosed is the fuel tank.

[0115] The fuel tank leak diagnosis device can diagnose whether the fuel tank leaks. The gas pumping device can be an air inflation pump.

[0116] The embodiment of the present application further provides a vehicle, including the fuel tank leak diagnosis system according to the above embodiment.

[0117] The embodiment of the present application further provides a vehicle, including the above fuel tank leak diagnosis system.

[0118] The above are only the preferred embodiments of the present application, and do not impose any formal restrictions on the present application. Although the present application has been disclosed above with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present application. However, as long as it does not depart from the content of the technical solution of the present application, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present application still fall within the scope of the technical solution of the present application.

[0119] The content disclosed in this patent document contains copyrighted material. This copyright belongs to the copyright owner. The copyright owner does not object to anyone copying this patent document or this patent disclosure as it exists in the official records and files of the Patent and Trademark Office.

Claims

1. A leakage diagnosis device, characterized in that, The leakage diagnosis device includes a main body (10); the main body includes a housing (11), a first chamber (121), an air replenishing valve (13), and a motion mechanism (14); The housing is provided with a first opening (111) for connecting to a gas pumping device and a second opening (112) for connecting to a device to be diagnosed; the first chamber is arranged inside the housing and communicates with the first opening; the air replenishing valve is used to connect the second opening to the atmosphere; the motion mechanism is located inside the housing and can move inside the housing to control the opening and closing of the air replenishing valve; The main body further includes a first baffle (171) and a second baffle (172) arranged in the housing from top to bottom in sequence; the first baffle, the second baffle, and the wall of the housing enclose to form the first chamber; the first baffle is a flexible plate; the motion mechanism is located above the first baffle; The motion mechanism (14) includes a main body part (141) and a second elastic member (142), and the main body further includes a pressure sensor (16) arranged inside the housing. The pressure sensor is arranged above the first baffle, and the pressure sensor detects the force exerted by the second elastic member on the pressure sensor; one end of the second elastic member abuts against the main body part, and the other end abuts against the pressure sensor; one of the pressure sensor and the main body part abuts against the housing, and the other abuts against the first baffle; When the pressure in the first chamber increases, the gas in the first chamber pushes the middle area of the first baffle to move in a direction away from the second baffle, the second elastic member is compressed, and the force exerted by the second elastic member on the pressure sensor increases; when the pressure in the first chamber decreases, the middle area of the first baffle moves in a direction close to the second baffle, the second elastic member stretches, and the force exerted by the second elastic member on the pressure sensor decreases; The leakage diagnosis device further includes a control part (20) and a controller. The control part is signal-connected to the controller, and the control part is used to control the connection or disconnection between the first chamber and the second opening according to the control signal of the controller.

2. The leak diagnosis device according to claim 1, characterized in that, The control part includes a first interface (21) and a second interface (22). The first interface communicates with the first chamber, and the second interface communicates with the second opening. The control part controls the connection or disconnection between the first chamber and the second opening by controlling the connection or disconnection between the first interface and the second interface.

3. The leak diagnosis device according to claim 1, wherein The main body is further provided with a third opening, and the third opening is used to connect the first chamber to the atmosphere. The size of the third opening is smaller than the size of the first opening; The control part is used to control the connection or disconnection between the first chamber and the third opening.

4. The leakage diagnosis device according to claim 3, characterized in that, The control unit includes a first interface (21) and a third interface (23). The first interface communicates with the first chamber, and the third interface communicates with the third opening. The control unit controls the communication or non-communication between the first chamber and the third opening by controlling the communication or non-communication between the first interface and the third interface.

5. The leak diagnosis device according to claim 1, characterized in that The body further includes a first baffle (171), a second baffle (172), and a third baffle (173) that are arranged in sequence from top to bottom within the housing. The first baffle, the second baffle, and the wall of the housing enclose the first chamber. The third baffle, the second baffle, and the wall of the housing enclose a second chamber (122). The second opening communicates with the second chamber. The control unit controls the communication or non-communication between the first chamber and the second opening by controlling the communication or non-communication between the second chamber and the first opening.

6. The leak diagnosis device according to claim 5, characterized in that, The air supplement valve (13) includes a connecting rod (133), a fourth opening (131) provided on the third baffle (173), a blocking portion (132) located below the third baffle, and a first elastic member (134) located between the blocking portion and the wall of the housing below. The blocking portion is connected to the connecting rod. The connecting rod passes through the third baffle and the second baffle and can move up and down. The fourth opening communicates the second chamber with the atmosphere. The first baffle is a flexible plate, and the motion mechanism is located above the first baffle. When the pressure in the first chamber increases, the gas in the first chamber pushes the middle region of the first baffle in a direction away from the second baffle. The first elastic member stretches and pushes the blocking portion and the connecting rod upward, and the blocking portion blocks the fourth opening. When the motion mechanism moves downward, it pushes the connecting rod downward, and the connecting rod drives the blocking portion downward, compressing the first elastic member.

7. The leak diagnosis device according to claim 6, characterized in that, The motion mechanism includes a main body portion (141) and a second elastic member (142). The main body portion (141) includes a sleeve (143), a turntable (144), a central rod (145), a support seat (146), and a limit block (147). The sleeve is fixed above the first baffle. A limiting groove (1431) and a convex part (1432) located between adjacent limiting grooves are provided at the lower part of the inner wall of the sleeve. A first guiding surface (1434) and a stop part (1433) adjacent to the first guiding surface are provided at the top end of the convex part. A second guiding surface (1435) is provided at the top of the stop part, and the second guiding surface is located above the first guiding surface. The turntable can move up and down in the sleeve, and a convex rib (1441) is provided on the outer wall of the turntable. The support seat (146) abuts against the upper end of the turntable. The lower end of the second elastic member abuts against the support seat, and the upper end abuts directly or indirectly against the housing. The limiting block is located above the bottom wall of the support seat and is connected to the central rod. The central rod passes through the turntable, and the upper end and the lower end of the central rod respectively expose out of the sleeve. A pushing part (1451) and a convex block (1452) located outside the pushing part are provided on the outer wall of the central rod. The turntable is located above the pushing part. In the initial state, the convex block (1452) and the convex rib (1441) are respectively located in the limiting groove (1431). The first baffle abuts against the second baffle, the lower end of the central rod abuts against the first baffle, and the fourth opening is not blocked by the blocking part. When the pressure in the first chamber increases, the middle part of the first baffle moves upward, pushing the central rod upward. The pushing part pushes the turntable and the support seat upward, and the second elastic member is compressed. The blocking part moves upward to block the fourth opening. After the convex rib separates from the limiting groove, the acting force of the second elastic member on the turntable causes the turntable to rotate. After the turntable rotates, the convex rib (1441) and the first guiding surface (1434) are vertically corresponding. When the pressure in the first chamber decreases, the middle part of the first baffle moves downward, and the central rod and the turntable move downward. After the convex rib abuts against the first guiding surface, the acting force of the second elastic member on the turntable causes the convex rib to move along the first guiding surface until it abuts against the stop part. When the central rod continues to move downward until the limiting block abuts against the support seat, the lower end of the central rod does not apply an acting force to the connecting rod. When the pressure in the first chamber increases again, the central rod, the turntable and the support seat move upward, and the second elastic member is compressed. During the upward movement of the turntable, the acting force of the second elastic member on the turntable causes the turntable to move. After the turntable rotates, the convex rib (1441) and the second guiding surface (1435) are vertically corresponding. When the pressure in the first chamber decreases again, the central rod and the turntable move downward. After the convex rib abuts against the second guiding surface, the acting force of the second elastic member on the turntable causes the convex rib to move along the second guiding surface and enter the limiting groove adjacent to the second guiding surface. Then, the central rod continues to move downward and pushes the first baffle to move until it abuts against the second baffle.

8. The leak diagnosis device according to claim 7, wherein A first meshing tooth structure (1453) is provided at the top of the pushing portion (1451), and a second meshing tooth structure (1442) that can mesh with the first meshing tooth structure is provided at the bottom of the turntable (144); In the initial state, the first meshing tooth structure and the second meshing tooth structure are not meshed; When the convex rib separates from the limiting groove and abuts against the stopping portion, under the acting force of the second elastic member on the turntable and the cooperation of the meshing tooth structure and the second meshing tooth structure, the turntable rotates, and then the first meshing tooth structure and the second meshing tooth structure are meshed.

9. A fuel tank leakage diagnosis system, characterized in that, It includes an oil tank, a gas pumping device, and the leakage diagnosis device according to any one of claims 1-8. The gas pumping device is connected to the first opening, and the oil tank is connected to the second opening.

10. A vehicle, characterized in that, It includes the oil tank leakage diagnosis system according to claim 9.

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