Diagnostic device and vehicle

Abstract

The invention discloses a diagnostic device and a vehicle, and the diagnostic device is used for diagnosing the evaporation leakage condition of a fuel tank and comprises a shell, a first driving device and a second driving device, the electromagnetic valve comprises a coil assembly and a valve element assembly, the coil assembly comprises a supporting piece used for winding a coil, the supporting piece comprises a supporting main body and an extending part, the supporting main body is located in the first cavity, and the extending part is connected to the side, facing the second cavity, of the supporting main body and extends into the second cavity; the valve element assembly is movably arranged in the supporting body and the extending part in a penetrating mode, one end of the valve element assembly in the axial direction is located in the supporting body, the other end of the valve element assembly is located in the second cavity, and at least part of the extending part is in interference fit with the valve element assembly in the length direction of the extending part. According to the diagnosis device, the problems of potential safety hazards such as explosion and spontaneous combustion can be solved, and the working safety is ensured.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and more particularly to a diagnostic device and a vehicle. Background Art

[0002] In the related art, the diagnostic module is connected to the fuel tank and has electrical components inside. If a short circuit occurs in the electrical components, a large amount of heat will be generated, which may easily ignite the fuel vapor, causing violent combustion or explosion, thus easily causing safety hazards and other problems. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a diagnostic device that can solve the safety hazards such as explosion and spontaneous combustion, and ensure work safety.

[0004] Another object of the present invention is to provide a vehicle having the above-mentioned diagnostic device.

[0005] A diagnostic device according to an embodiment of the present invention is used to diagnose the evaporation leakage of a fuel tank and includes: a shell having a first cavity and a second cavity; a solenoid valve, the solenoid valve including a coil assembly and a valve core assembly, the coil assembly including a support member for winding the coil, the support member including a support body and an extension portion, the support body is located in the first cavity, the extension portion is connected to a side of the support body facing the second cavity and extends into the second cavity, the valve core assembly is movably arranged in the support body and the extension portion, and one end of the valve core assembly in an axial direction is located in the support body and the other end is located in the second cavity, and along the length direction of the extension portion, at least a portion of the extension portion is interference fit with the valve core assembly.

[0006] According to the diagnostic device of the embodiment of the present invention, the support member of the coil assembly includes a support body and an extension part, the support body is located in the first cavity, the extension part is connected to the side of the support body facing the second cavity and extends into the second cavity, the valve core assembly is movably arranged in the support body and the extension part, and along the length direction of the extension part, at least part of the extension part is interference fit with the valve core assembly. In this way, the gap between the support member and the valve core assembly can be blocked, and the fuel vapor can be effectively prevented from entering the first cavity through the gap between the support member and the valve core assembly, thereby solving the safety hazards of the diagnostic module being prone to explosion and spontaneous combustion from the root, and ensuring the working safety of the diagnostic module.

[0007] In addition, the diagnostic device according to the above embodiment of the present invention may also have the following additional technical features:

[0008] According to some embodiments of the diagnostic device of the present invention, the extension portion comprises an inclined section, and an inner diameter of the inclined section gradually decreases in a direction from the support body to the extension portion.

[0009] According to some embodiments of the present invention, in a cross section along the axial direction of the extension portion, an angle between an inner contour line of the inclined segment and a central axis of the extension portion is 2°-3°.

[0010] According to some embodiments of the present invention, in the length direction of the extension portion, the height of the inclined section is 1.7 mm-2.3 mm.

[0011] According to some embodiments of the present invention, the extension portion further includes: a straight line segment, wherein the straight line segment is connected between the support body and the inclined segment, and along the length direction of the extension portion, the inner diameter of the straight line segment is constant and is greater than or equal to the maximum inner diameter of the inclined segment.

[0012] According to some embodiments of the present invention, the wall thickness of the straight line segment is 0.4 mm-0.6 mm.

[0013] According to some embodiments of the present invention, a partition is provided in the shell, and the partition is located between the first cavity and the second cavity for separating the first cavity and the second cavity, and a first sealing ring is provided between the outer peripheral wall of the partition and the inner wall surface of the shell.

[0014] According to some embodiments of the present invention, the shell further has a third cavity, and the diagnostic device further includes: an air pump, the air pump includes a pump body, the pump body is arranged in the third cavity, the air outlet of the pump body is connected to the second cavity, and a second sealing ring is provided between the outer circumferential wall of the pump body and the inner circumferential wall of the third cavity.

[0015] According to some embodiments of the present invention, the air inlet of the pump body is connected to the third cavity, and the air pump also includes: a first sealing device, which is arranged at the air inlet, and the first sealing device only allows the medium to flow from the third cavity to the air inlet, and prevents the medium from flowing from the air inlet to the third cavity.

[0016] According to some embodiments of the present invention, the first sealing device includes: a limiting portion, which is provided on the pump body and is spaced apart from the air inlet; and a sealing member, which is located between the limiting portion and the air inlet and is movable along the axial direction of the air inlet, and is used to seal the air inlet.

[0017] According to some embodiments of the present invention, the first sealing device also includes: a supporting portion, which is arranged on a side of the limiting portion close to the air inlet and surrounds the air inlet, the supporting portion and the limiting portion are spaced apart in the axial direction of the air inlet, and the sealing member is located between the supporting portion and the limiting portion; a portion of the supporting portion is recessed in a direction away from the limiting portion to form a groove, the depth of the groove is less than the thickness of the supporting portion, and the supporting portion, the sealing member and the limiting portion jointly define an air channel.

[0018] According to some embodiments of the present invention, the groove extends along the radial direction of the support portion; and / or, the groove is a plurality of grooves arranged at intervals along the circumferential direction of the support portion.

[0019] According to some embodiments of the present invention, the pump body comprises a accommodating cavity, a connecting channel and an air outlet channel, one end of the connecting channel is connected to the air inlet of the pump body, one end of the air outlet channel is configured as the air outlet, one end of the connecting channel away from the air inlet and one end of the air outlet channel away from the air outlet are connected to the accommodating cavity, and the air pump further comprises: a second sealing device, at least a portion of the second sealing device is disposed in the accommodating cavity, the second sealing device is used to connect or disconnect the connection between the connecting channel and the air outlet channel.

[0020] According to some embodiments of the present invention, the second sealing device includes: a blocking member, which is movably disposed in the accommodating cavity and is used to connect or disconnect the connection between the connecting channel and the air outlet channel; and a driving mechanism, at least a portion of which is disposed in the pump body and is used to drive the blocking member to move.

[0021] According to some embodiments of the present invention, the pump body further has an installation cavity, and the driving mechanism includes: a driving motor, which is disposed in the first cavity; a cam, which is disposed in the installation cavity and connected to the output shaft of the driving motor; a driving plate, which is disposed in the installation cavity and connected to the sealing member, and the driving plate is suitable for abutting against the outer peripheral wall of the cam, and the driving plate and the cam are arranged in the moving direction of the sealing member.

[0022] According to some embodiments of the present invention, the driving mechanism further includes: an elastic member, one end of which is connected or abutted to the driving plate, and the other end of which is connected or abutted to the pump body, and the elastic member is used to drive the driving plate to move toward the cam side.

[0023] According to some embodiments of the present invention, a sealing portion is provided between the outer peripheral wall of the sealing member and the inner peripheral wall of the accommodating cavity, and the sealing portion is located on the side of the connecting channel and the air outlet channel close to the driving mechanism to separate the installation cavity and the accommodating cavity, and the installation cavity is connected to the external atmosphere.

[0024] According to some embodiments of the present invention, the driving mechanism further includes: a connecting member, both ends of which in the length direction are respectively connected to the blocking member and the driving plate, and the cam is located on a side of the connecting member close to the driving motor.

[0025] According to some embodiments of the present invention, the shell has a main air channel, a main hole and a reference hole, the main hole and the reference hole are connected with the second cavity and the main air channel, and the main air channel is connected with the air outlet; the diagnostic device has a learning mode, when the diagnostic device is in the learning mode, the valve core assembly closes the main hole and opens the connection between the second cavity and the atmosphere, the air pump drives air into the main air channel, and part of the air flows out through the reference hole and the second cavity.

[0026] According to some embodiments of the present invention, the diagnostic device has a diagnostic mode. When the diagnostic device is in the diagnostic mode, the valve core assembly opens the main hole and closes the connection between the second cavity and the atmosphere, and the air pump drives air into the main air channel and into the fuel tank through the reference hole and the main hole.

[0027] According to some embodiments of the present invention, the diagnostic device has an adsorption mode, and when the diagnostic device is in the adsorption mode, the second cavity is connected to the fuel tank and the atmosphere.

[0028] According to some embodiments of the present invention, a carbon canister is provided between the diagnostic device and the fuel tank, and the diagnostic device has a desorption mode. When the diagnostic device is in the desorption mode, the second cavity is connected to the atmosphere and to the engine manifold through the carbon canister, and air flows only from the second cavity to the engine manifold.

[0029] The vehicle according to the embodiment of the present invention includes the diagnosis device according to the embodiment of the present invention.

[0030] According to the vehicle of the embodiment of the present invention, the support member through the coil assembly includes a support body and an extension part, the support body is located in the first cavity, the extension part is connected to the side of the support body facing the second cavity and extends into the second cavity, the valve core assembly is movably arranged in the support body and the extension part, and along the length direction of the extension part, at least part of the extension part is interference fit with the valve core assembly. In this way, the gap between the support member and the valve core assembly can be blocked, and the fuel vapor can be effectively prevented from entering the first cavity through the gap between the support member and the valve core assembly, so as to fundamentally solve the safety hazards such as explosion and spontaneous combustion of the diagnostic module, and ensure the working safety of the diagnostic module.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 is a cross-sectional view of a diagnostic device according to an embodiment of the present invention;

[0034] Figure 2 is a cross-sectional view of a support member of a diagnostic device according to an embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of a diagnostic device in an adsorption mode according to an embodiment of the present invention;

[0036] Figure 4 is a cross-sectional view of a diagnostic device in an adsorption mode according to an embodiment of the present invention;

[0037] Figure 5 is a schematic diagram of a diagnostic device in a desorption mode according to an embodiment of the present invention;

[0038] Figure 6 is a cross-sectional view of a diagnostic device in a desorption mode according to an embodiment of the present invention;

[0039] Figure 7 is a schematic diagram of a diagnostic device in a learning mode according to an embodiment of the present invention;

[0040] Figure 8 is a cross-sectional view of a diagnostic device in a learning mode according to an embodiment of the present invention;

[0041] Fig. 9 is a schematic diagram of a diagnostic device in a diagnostic mode according to an embodiment of the present invention;

[0042] Fig.10is a cross-sectional view of a diagnostic device according to an embodiment of the present invention in a diagnostic mode;

[0043] Fig.11 is a cross-sectional view of an air pump of a diagnostic device according to an embodiment of the present invention, wherein the connecting channel and the air outlet channel are disconnected;

[0044] Fig.12 is a cross-sectional view of an air pump of a diagnostic device according to an embodiment of the present invention, wherein the connecting channel and the air outlet channel are in communication;

[0045] Fig.13 yes Fig.12 The middle circle shows the enlarged structural schematic diagram of A;

[0046] Fig.14 is a partial structural schematic diagram of an angle of a housing of a diagnostic device according to an embodiment of the present invention;

[0047] Fig.15 is a partial structural schematic diagram of a housing of a diagnostic device according to an embodiment of the present invention from another angle;

[0048] Fig.16 4 is a schematic diagram of the partial structure of the second sealing device of the diagnostic device according to an embodiment of the present invention.

[0049] Reference numerals:

[0050] 100, diagnostic device; 200, fuel tank; 300, carbon canister; 400, engine manifold;

[0051] 10. Shell; 11. First cavity; 12. Second cavity; 13. Third cavity; 14. Atmospheric interface; 15. Interface of the device to be diagnosed; 16. Main airway; 17. Main hole; 18. Reference hole; 19. Filter; 121. First airway; 122. Second airway; 123. First sub-cavity; 124. Second sub-cavity;

[0052] 20. Solenoid valve; 21. Coil assembly; 22. Valve core assembly; 23. Spring; 24. Valve seat; 211. Support member; 221. Iron core; 222. Valve cover; 241. Vent hole;

[0053] 31. Support body; 32. Extension portion; 321. Inclined section; 322. Straight section;

[0054] 40. partition; 41. first sealing ring;

[0055] 50. air pump; 51. pump body; 52. second sealing ring; 53. first sealing device; 54. second sealing device; 511. air outlet; 512. air inlet; 513. accommodating chamber; 514. connecting channel; 515. air outlet channel; 516. mounting chamber; 531. supporting part; 532. limiting part; 533. sealing member; 534. groove; 535. air channel; 541. blocking member; 542. driving mechanism; 543. sealing member;

[0056] 61. driving motor; 62. cam; 63. driving plate; 64. elastic member; 65. connecting member; 611. output shaft;

[0057] 71. Stop valve; 72. Control valve. DETAILED DESCRIPTION

[0058] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, a first feature "above" or "below" the second feature may include the first and second features being directly in contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, and a first feature "above", "above" and "above" the second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is horizontally higher than the second feature.

[0061] The following describes a diagnostic apparatus 100 according to an embodiment of the present invention with reference to the accompanying drawings.

[0062] Reference Figure 1-Figure 10As shown, the diagnostic device 100 according to the embodiment of the present invention can diagnose the evaporation leakage of the fuel tank 200, so as to facilitate timely acquisition of the evaporation leakage of the fuel tank 200, and avoid serious leakage of the fuel tank 200 into the air, thereby preventing air pollution and other problems. The diagnostic device 100 may include: a housing 10 and a solenoid valve 20.

[0063] Specifically, the housing 10 has a first cavity 11 and a second cavity 12. The solenoid valve 20 includes a coil assembly 21 and a valve core assembly 22. The coil assembly 21 includes a support member 211. The support member 211 can be wound around the coil to meet the required installation requirements. The support member 211 includes a support body 31 and an extension 32. The support body 31 is located in the first cavity 11. The extension 32 is connected to the side of the support body 31 facing the second cavity 12 (for example, Figure 1 The valve core assembly 22 is movably disposed in the support body 31 and the extension portion 32, and the valve core assembly 22 is axially (eg Figure 1 One end of the valve core assembly 22 in the up and down direction as shown in the figure is located in the support body 31, and the other end of the valve core assembly 22 in the axial direction is located in the second cavity 12, which can meet the movement requirements of the valve core assembly 22, thereby meeting the working requirements of the diagnostic device 100, and the extension portion 32 can increase the support and guide area of ​​the valve core assembly 22, ensuring that the movement of the valve core assembly 22 is more reliable and avoiding movement deviation.

[0064] The diagnostic module is connected to the fuel tank 200 to diagnose the evaporation leakage of the fuel tank 200. Since the diagnostic module has electrical components (such as electrical connectors, motors and coils, etc.), the electrical components are located in the first cavity 11, and the fuel vapor can easily enter the first cavity 11. If a short circuit occurs in the electrical components, a large amount of heat will be generated, which can easily ignite the fuel vapor and cause violent combustion or explosion, thereby easily causing safety hazards and other problems.

[0065] Therefore, in the present invention, if Figure 1 and Figure 2 As shown, along the length direction of the extension portion 32 (eg Figure 1 ), at least a portion of the extension portion 32 is interference fit with the valve core assembly 22, thereby, the gap between the support member 211 and the valve core assembly 22 can be blocked by the interference fit between the extension portion 32 and the valve core assembly 22, and the fuel vapor is effectively prevented from entering the first cavity 11 through the gap between the support member 211 and the valve core assembly 22, thereby solving the safety hazards such as explosion and spontaneous combustion of the diagnostic module from the root, and ensuring the working safety of the diagnostic module.

[0066] It should be noted that, for the convenience of description, the directions such as “upper” and “lower” in the present invention are based on the directions shown in the accompanying drawings, and are not limitations on the directions in actual application.

[0067] According to the diagnostic device 100 of the embodiment of the present invention, the support member 211 of the coil assembly 21 includes a support body 31 and an extension 32, the support body 31 is located in the first cavity 11, the extension 32 is connected to the side of the support body 31 facing the second cavity 12 and extends into the second cavity 12, the valve core assembly 22 is movably arranged in the support body 31 and the extension 32, and along the length direction of the extension 32, at least part of the extension 32 is interference fit with the valve core assembly 22. In this way, the gap between the support member 211 and the valve core assembly 22 can be blocked, and the fuel vapor can be effectively prevented from entering the first cavity 11 through the gap between the support member 211 and the valve core assembly 22, thereby solving the safety hazards such as explosion and spontaneous combustion of the diagnostic module from the root, and ensuring the working safety of the diagnostic module.

[0068] In some embodiments of the present invention, Figure 2 As shown, the extension portion 32 includes an inclined section 321, which extends from the support body 31 to the extension portion 32 (eg Figure 1 As shown in the figure, the inner diameter of the inclined section 321 gradually decreases. Therefore, when the valve core assembly 22 moves in the support body 31 and the extension 32, the valve core assembly 22 can be interference-fitted with the inclined section 321 when it moves to the inclined section 321, thereby achieving interference fit between the extension 32 and the valve core assembly 22, and when the valve core assembly 22 moves toward the direction close to the support body (for example, Figure 1 When the valve core assembly 22 moves (as shown in the upper part), it is convenient for the valve core assembly 22 to disengage from the extension portion 32, so that the valve core assembly 22 moves more smoothly. At the same time, the structure of the extension portion 32 is simple, which is convenient for processing and manufacturing the support member 211, and is conducive to reducing manufacturing costs.

[0069] For example, when the solenoid valve 20 is powered off, the coil is not energized, and the valve core assembly 22 moves downward under the action of gravity, so that the valve core assembly 22 and the inclined section 321 have an interference fit to achieve the sealing requirement; when the solenoid valve 20 is powered on, since the inclined section 321 has an inclination, the valve core assembly 22 can move upward smoothly, making the movement and sealing reliable.

[0070] According to some embodiments of the present invention, Figure 2As shown, on the cross section along the axial direction of the extension portion 32, the angle between the inner contour line of the inclined section 321 and the central axis of the extension portion 32 is 2°-3°, that is, on the cross section along the axial direction of the extension portion 32, the angle between the inner contour line of the inclined section 321 and the central axis of the extension portion 32 is α, and α satisfies: 2°≤α≤3°. Within the above range, it is convenient for the valve core assembly 22 to have an interference fit with the inclined section 321, ensuring a reliable seal, and it is convenient for the valve core assembly 22 to be disengaged from the extension portion 32, ensuring smooth movement, and at the same time, it can avoid processing difficulties and cost increases caused by excessive angles. For example, in some specific embodiments, on the cross section along the axial direction of the extension portion 32, the angle between the inner contour line of the inclined section 321 and the central axis of the extension portion 32 can be 2°, 2.1°, 2.2°, 2.3°, 2.4°, 2.5°, 2.6°, 2.7°, 2.8°, 2.9°, 3°, etc.

[0071] In some embodiments of the present invention, Figure 2 As shown, in the length direction of the extension portion 32, the height of the inclined section 321 is 1.7mm-2.3mm, that is, in the length direction of the extension portion 32, the height of the inclined section 321 is H, and H satisfies: 1.7mm≤H≤2.3mm. Within the above range, it is possible to ensure that the valve core assembly 22 smoothly transitions during movement, avoids increasing friction resistance due to excessive height, and avoids affecting the sealing effect due to too small height, while facilitating processing and manufacturing. For example, in some specific embodiments, in the length direction of the extension portion 32, the height of the inclined section 321 can be 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, etc.

[0072] According to some embodiments of the present invention, Figure 2 As shown, the extension portion 32 also includes a straight section 322, which is connected between the support body 31 and the inclined section 321. Along the length direction of the extension portion 32, the inner diameter of the straight section 322 remains unchanged, and the inner diameter of the straight section 322 is greater than or equal to the maximum inner diameter of the inclined section 321. The straight section 322 can provide a stable guiding effect for the valve core assembly 22, thereby facilitating the movement of the valve core assembly 22 between the support body 31 and the extension portion 32, thereby ensuring smooth and reliable movement.

[0073] In some embodiments of the present invention, Figure 2As shown, the wall thickness of the straight segment 322 is 0.4 mm-0.6 mm, that is, the wall thickness of the straight segment 322 is t, and t satisfies: 0.4 mm≤t≤0.6 mm. Within the above range, while ensuring the structural strength of the extension portion 32, the extension portion 32 can be formed into a thin wall, and the thin wall structure has a certain elasticity, which is convenient for achieving the required sealing and movement requirements, and can reduce weight and cost. For example, in some specific embodiments, the wall thickness of the straight segment 322 can be 0.4 mm, 0.42 mm, 0.45 mm, 0.48 mm, 0.5 mm, 0.52 mm, 0.55 mm, 0.58 mm, 0.6 mm, etc.

[0074] In some specific embodiments, Figure 2 As shown, the extension portion 32 includes an inclined section 321 and a straight section 322. The straight section 322 is connected between the support body 31 and the inclined section 321. In the up-down direction, the inner diameter of the straight section 322 is constant and is greater than or equal to the maximum inner diameter of the inclined section 321. The wall thickness of the straight section 322 is 0.4mm-0.6mm. In the direction from top to bottom, the inner diameter of the inclined section 321 gradually decreases. In the cross section along the axial direction of the extension portion 32, the angle between the inner contour line of the inclined section 321 and the central axis of the extension portion 32 is 2°-3°. In the up-down direction, the height of the inclined section 321 is 1.7mm-2.3mm.

[0075] As a result, the extension portion 32 is formed into a thin-walled structure with a certain elasticity. When the solenoid valve 20 is powered off, the valve core assembly 22 loses the electromagnetic attraction and moves downward under the action of gravity, so that it can be inserted into the inclined section 321 at the lower end of the extension portion 32 to form an interference fit and achieve a sealing effect. When the solenoid valve 20 is powered on, since the inclined section 321 at the lower end of the extension portion 32 is a thin-walled structure with an inclination, the valve core assembly 22 can move upward smoothly to meet the required movement requirements.

[0076] According to some embodiments of the present invention, Figure 1 , Figure 4 , Figure 6 , Figure 8 and Fig.10 As shown, a partition 40 is provided in the housing 10, and the partition 40 is located between the first cavity 11 and the second cavity 12. The partition 40 can separate the first cavity 11 and the second cavity 12 to prevent the fuel vapor in the second cavity 12 from entering the first cavity 11, and a first sealing ring 41 is provided between the outer peripheral wall of the partition 40 and the inner wall surface of the housing 10, which can effectively prevent the fuel vapor from entering the first cavity 11 through the gap between the partition 40 and the housing 10, thereby solving the safety hazards such as explosion and spontaneous combustion of the diagnostic module from the root, and ensuring the working safety of the diagnostic module. For example, the first sealing ring 41 is an O-ring.

[0077] In some embodiments of the present invention, Figure 1 , Figure 3-Figure 10 As shown, the shell 10 also has a third cavity 13, and the diagnostic device 100 also includes an air pump 50. The air pump 50 includes a pump body 51. The pump body 51 is arranged in the third cavity 13. The air outlet 511 of the pump body 51 is connected to the second cavity 12. The air pump 50 can realize the demand for driving airflow flow required by the diagnostic device 100, thereby realizing the working requirements of the diagnostic device 100.

[0078] Since all parts of the air pump 50 have gaps, fuel vapor can easily enter the third cavity 13 through the gaps, and fuel vapor in the third cavity 13 can easily enter the first cavity 11, which can easily cause safety hazards and other problems. Figure 1 , Figure 4 , Figure 6 , Figure 8 and Fig.10 As shown, a second sealing ring 52 is provided between the outer peripheral wall of the pump body 51 and the inner peripheral wall of the third cavity 13, and the second sealing ring 52 can effectively prevent the fuel vapor from entering the first cavity 11 through the gap between the pump body 51 and the inner peripheral wall of the third cavity 13, thereby solving the safety hazards such as explosion and spontaneous combustion of the diagnostic module from the root, and ensuring the working safety of the diagnostic module. For example, the second sealing ring 52 is an O-ring.

[0079] According to some embodiments of the present invention, Figure 7 and Figure 8 As shown, the housing 10 has a main air passage 16, a main hole 17 and a reference hole 18, the main hole 17 and the reference hole 18 are connected to the second cavity 12 and the main air passage 16, and the main air passage 16 is connected to the air outlet 511. The diagnostic device 100 has a learning mode. When the diagnostic device 100 is in the learning mode, the valve core assembly 22 closes the main hole 17 and opens the connection between the second cavity 12 and the atmosphere. The air pump 50 can drive air to enter the main air passage 16 from the air outlet 511, and part of the air in the main air passage 16 flows out through the reference hole 18 and the second cavity 12, for example, to the atmosphere, simulating the leakage of the fuel tank 200. After the air pressure in the main air passage 16 is stabilized, the current of the air pump 50 reaches a balanced value, and the current value of the air pump 50 is recorded, thereby completing the detection of the reference current. For example, the current value of the air pump 50 is recorded by the electronic control unit (ECU) of the vehicle.

[0080] In some embodiments of the present invention, Fig. 9 and Fig.10As shown, the diagnostic device 100 has a diagnostic mode. When the diagnostic device 100 is in the diagnostic mode, the valve core assembly 22 opens the main hole 17 and closes the connection between the second cavity 12 and the atmosphere. The air pump 50 can drive air from the air outlet 511 into the main air passage 16. The air in the main air passage 16 enters the fuel tank 200 through the reference hole 18 and the main hole 17. When the air pressure in the fuel tank 200 is stable and the current of the air pump 50 reaches a balanced value, the current value of the air pump 50 is recorded. Therefore, the leakage of the fuel tank 200 is determined by comparing and analyzing the current value of the air pump 50 obtained in the diagnostic mode with the current value of the air pump 50 obtained in the learning mode, and the leakage of the fuel tank 200 is detected.

[0081] According to some embodiments of the present invention, Figure 3 and Figure 4 As shown, the diagnostic device 100 has an adsorption mode. When the diagnostic device 100 is in the adsorption mode, the second cavity 12 connects the fuel tank 200 with the atmosphere, thereby enabling conduction between the fuel tank 200 and the atmosphere, ensuring the stability of the air pressure in the fuel tank 200, and realizing different usage requirements of the diagnostic device 100.

[0082] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, a carbon canister 300 is provided between the diagnostic device 100 and the fuel tank 200, and the diagnostic device 100 has a desorption mode. When the diagnostic device 100 is in the desorption mode, the second cavity 12 is connected to the atmosphere, and the second cavity 12 is connected to the engine manifold 400 through the carbon canister 300, and the air only flows from the second cavity 12 to the engine manifold 400, so that the fuel absorbed on the carbon canister 300 can enter the engine through the engine manifold 400 together with the airflow to be burned, which can fully utilize the fuel and avoid waste, and can also clean the carbon canister 300 so that the carbon canister 300 can maintain its adsorption capacity.

[0083] In some specific embodiments, Figure 1-Figure 10 As shown, the second cavity 12 includes a first sub-cavity 123 and a second sub-cavity 124, the first sub-cavity 123 and the second sub-cavity 124 are connected through a vent hole 241, the housing 10 is provided with an atmosphere interface 14 and a device interface 15 to be diagnosed, the atmosphere interface 14 is connected to the outside atmosphere, the first sub-cavity 123 and the third cavity 13, and the device interface 15 to be diagnosed is connected to the second sub-cavity 124. The housing 10 also has a main airway 16, a main hole 17 and a reference hole 18, the main hole 17 and the reference hole 18 are connected to the main airway 16 and the second sub-cavity 124, the air outlet 511 is connected to the main airway 16, the valve core assembly 22 can open the vent hole 241 when closing the main hole 17 or close the vent hole 241 when opening the main hole 17, and the exhaust volume of the reference hole 18 is less than the maximum allowable leakage of the device to be diagnosed.

[0084] The diagnostic device 100 is connected to the carbon canister 300 through the interface of the device to be detected. The carbon canister 300 is connected to the fuel tank 200 and the engine manifold 400 respectively. A stop valve 71 is provided between the carbon canister 300 and the fuel tank 200, and a control valve 72 is provided between the carbon canister 300 and the engine manifold 400. The diagnostic device 100 has four working modes, namely, adsorption mode, desorption mode, learning mode and diagnostic mode.

[0085] In adsorption mode, such as Figure 3 and Figure 4 As shown, the solenoid valve 20 is in the power-off state, the valve core assembly 22 closes the main hole 17 and opens the vent hole 241, the stop valve 71 is in the open state, and the control valve 72 is in the closed state. The volatilized fuel vapor in the fuel tank 200 first passes through the carbon canister 300, and the carbon canister 300 absorbs the fuel in the fuel vapor. Then the remaining gas enters the second sub-cavity 124 through the interface 15 of the device to be diagnosed, and then flows from the atmosphere interface 14 to the atmosphere through the vent hole 241 and the first sub-cavity 123, so as to realize the conduction between the fuel tank 200 and the atmosphere, thereby ensuring the stability of the air pressure in the fuel tank 200. At the same time, the fuel vapor is adsorbed by the carbon canister 300 to prevent the evaporated fuel from being discharged into the air and polluting the air.

[0086] In desorption mode, Figure 5 and Figure 6 As shown, the solenoid valve 20 is in the power-off state, the valve core assembly 22 closes the main hole 17 and opens the vent hole 241, the stop valve 71 is in the closed state, and the control valve 72 is in the open state. The engine starts to generate suction force, and a large negative pressure is generated in the engine manifold 400 under the engine intake pressure. The air enters the first sub-cavity 123 from the atmosphere interface 14, and then flows through the vent hole 241 and the second sub-cavity 124, and flows through the carbon canister 300 from the device to be diagnosed interface 15 to enter the engine manifold 400. In this process, the fuel absorbed on the carbon canister 300 can enter the engine with the air flow to be burned, which can fully utilize the fuel and avoid waste, and can clean the carbon canister 300 so that the carbon canister 300 can maintain its adsorption capacity.

[0087] In learning mode, such as Figure 7 and Figure 8As shown, the solenoid valve 20 is in a power-off state, the valve core assembly 22 closes the main hole 17 and opens the vent hole 241, and the control valve 72 and the stop valve 71 are both in a closed state. The air pump 50 is started to generate negative pressure, and air enters the third cavity 13 from the atmospheric interface 14. The air in the third cavity 13 enters the air pump 50 from the air inlet 512, and flows into the main air passage 16 from the air outlet 511 after being pressurized by the air pump 50. Part of the air leaks out from the reference hole 18, and flows through the vent hole 241 through the second sub-cavity 124 and the first sub-cavity 123 from the atmospheric interface 14 to the atmosphere or the third sub-cavity, simulating the leakage of the fuel tank 200. After the air pressure in the main air passage 16 is stabilized, the current of the air pump 50 reaches a balanced value, and the current value of the air pump 50 is recorded, thereby completing the detection of the reference current.

[0088] In diagnostic mode, such as Fig. 9 and Fig.10 As shown, the solenoid valve 20 is in the power-on state, the valve core assembly 22 opens the main hole 17 and closes the vent hole 241, the control valve 72 is in the closed state, and the stop valve 71 is in the open state. The air pump 50 is started to generate negative pressure, and air enters the third cavity 13 from the atmospheric interface 14. The air in the third cavity 13 enters the air pump 50 from the air inlet 512, and after being pressurized by the air pump 50, it flows into the main air channel 16 from the air outlet 511. The airflow passes through the reference hole 18 and the main hole 17 and enters the second sub-cavity 124, and enters the fuel tank 200 from the carbon canister 300 through the interface 15 of the device to be diagnosed. When the air pressure in the fuel tank 200 is stable and the current of the air pump 50 reaches a balanced value, the current value of the air pump 50 is recorded.

[0089] The leakage of the fuel tank 200 is determined by comparing and analyzing the current value of the air pump 50 obtained in the diagnostic mode with the current value of the air pump 50 obtained in the learning mode, thereby completing the detection of the leakage of the fuel tank 200. For example, if the current value of the air pump 50 obtained in the diagnostic mode is greater than the current value of the air pump 50 obtained in the learning mode, that is, the leakage amount of the fuel tank 200 is less than the exhaust amount of the reference hole 18, it is determined that the fuel tank 200 has no leakage; if the current value of the air pump 50 obtained in the diagnostic mode is less than the current value of the air pump 50 obtained in the learning mode, that is, the leakage amount of the fuel tank 200 is greater than the exhaust amount of the reference hole 18, it is determined that the fuel tank 200 has a leakage.

[0090] In some embodiments, Figure 1 , Figure 4 , Figure 6 , Figure 8 and Fig.10 As shown, the valve core assembly 22 includes an iron core 221 and a valve cover 222. The end of the iron core 221 away from the first cavity 11 (eg Figure 1The lower end shown in the figure is connected to the valve cover 222, the valve cover 222 is located in the second sub-cavity 124, and the iron core 221 is movably arranged in the support body 31 and the extension portion 32, so that the valve cover 222 can open the air hole 241 when the main hole 17 is closed or close the air hole 241 when the main hole 17 is opened, thereby meeting the required control requirements, and the valve core assembly 22 has a simple structure and is easy to process and manufacture, which is conducive to reducing production costs.

[0091] In addition, if Figure 1 , Figure 4 , Figure 6 , Figure 8 and Fig.10 As shown, the valve core assembly 22 further includes a spring 23, which is disposed between the housing 10 and the valve cover 222. The spring 23 can drive the valve cover 222 toward a direction away from the support body (eg Figure 1 Thus, through the elastic force of the spring 23, it is easy to realize the driving movement of the valve core assembly 22, so that the movement of the valve core assembly 22 in the support body 31 and the extension portion 32 is more reliable, meeting the required movement requirements.

[0092] For example, when the coil is energized, suction is generated on the iron core 221, so that the iron core 221 drives the valve cover 222 toward a direction close to the vent hole 241 (for example, Figure 1 ) to block the vent hole 241, while the main hole 17 is opened to meet the required gas flow requirements; when the coil is powered off, the valve cover 222 will move away from the vent hole 241 (for example, Figure 1 The main hole 17 is blocked while the vent hole 241 is opened, thereby meeting the required gas flow requirements.

[0093] In some embodiments, Figure 1 , Figure 4 , Figure 6 , Figure 8 and Fig.10 As shown, the solenoid valve 20 also includes a valve seat 24, which is disposed in the second cavity 12. The valve seat 24 can divide the second cavity 12 into a first sub-cavity 123 and a second sub-cavity 124. A vent 241 is disposed on the valve seat 24, which is convenient for dividing the second cavity 12 and can reduce the complexity of the shell 10, thereby helping to reduce production costs.

[0094] In some embodiments, Figure 1 , Figure 4 , Figure 6 , Figure 8 , Fig.10 , Fig.14 and Fig.15As shown, the shell 10 is also provided with a first air vent 121 and a second air vent 122. The first air vent 121 connects the atmosphere interface 14 with the first sub-cavity 123, and the second air vent 122 connects the atmosphere interface 14 with the third cavity 13, which is convenient for realizing the connection requirement between the atmosphere interface 14 and the first sub-cavity 123 and the third cavity 13, and the structure is simple, which is convenient for processing and manufacturing.

[0095] In some embodiments, Figure 1 , Figure 4 , Figure 6 , Figure 8 and Fig.10 As shown, a filter 19 is provided at the reference hole 18 , and the filter 19 can filter impurities in the airflow to prevent the impurities from entering the solenoid valve 20 through the reference hole 18 and causing damage to the solenoid valve 20 , which is beneficial to extending the service life of the diagnostic device 100 .

[0096] According to some embodiments of the present invention, Figure 1 , Figure 4 , Figure 6 , Figure 8 , Figure 10-13 As shown, the air inlet 512 of the pump body 51 is connected to the third cavity 13, and the air pump 50 further includes a first sealing device 53, which is arranged at the air inlet 512. The first sealing device 53 only allows the medium to flow from the third cavity 13 to the air inlet 512, and prevents the medium from flowing from the air inlet 512 to the third cavity 13. Thus, the medium (such as air) can flow from the third cavity 13 to the air inlet 512, ensuring the normal operation of the air pump 50, and when the air pump 50 is not working, the medium (such as fuel vapor) in the air pump 50 can be prevented from flowing from the air inlet 512 to the third cavity 13, thereby preventing the fuel vapor from entering the first cavity 11 through the third cavity 13, thereby solving the safety hazards of the diagnostic module being prone to explosion and spontaneous combustion from the root, and ensuring the working safety of the diagnostic module.

[0097] In some embodiments of the present invention, Fig.13 As shown, the first sealing device 53 includes a limiting portion 532 and a sealing member 533. The limiting portion 532 is provided on the pump body 51, and the limiting portion 532 is spaced apart from the air inlet 512. The sealing member 533 is located between the limiting portion 532 and the air inlet 512. The sealing member 533 is arranged along the axial direction of the air inlet 512 (for example, Fig.13 The first sealing device 533 is movable in the vertical direction shown in the figure, so that the sealing member 533 can block the air inlet 512, preventing the medium in the air pump 50 from flowing from the air inlet 512 to the third cavity 13, ensuring the working safety of the diagnostic module, and the first sealing device 53 has a simple structure, which is easy to process and manufacture, and is conducive to reducing production costs. For example, the sealing member 533 can be a soft rubber gasket, etc.

[0098] According to some embodiments of the present invention, Fig.13 As shown, the first sealing device 53 also includes a support portion 531, which is arranged on a side of the limiting portion 532 close to the air inlet 512, and the support portion 531 surrounds the air inlet 512. The support portion 531 and the limiting portion 532 are spaced apart in the axial direction of the air inlet 512, and the structural strength at the air inlet 512 can be increased by the support portion 531.

[0099] In addition, if Fig.13 As shown, the sealing member 533 is located between the support portion 531 and the limiting portion 532, and a portion of the support portion 531 is recessed in a direction away from the limiting portion 532 to form a groove 534, the depth of the groove 534 is less than the thickness of the support portion 531, and the support portion 531, the sealing member 533 and the limiting portion 532 jointly define an air passage 535. When the sealing member 533 moves toward the direction close to the support portion 531 (for example Fig.13 ), the medium in the third cavity 13 can enter the air inlet 512 through the air channel 535, so that the medium can flow from the third cavity 13 to the air inlet 512, thereby ensuring the normal operation of the air pump 50. Therefore, the sealing member 533 allows the medium to flow from the third cavity 13 to the air inlet 512 and prevents the medium from flowing from the air inlet 512 to the third cavity 13, thereby making the control convenient and the structure simple.

[0100] For example, when the air pump 50 is working, the gas between the seal 533 and the support portion 531 is sucked, so that the air pressure between the seal 533 and the support portion 531 is lower than the air pressure in the third cavity 13, and the seal 533 moves upward under the action of the air pressure, and the gas in the third cavity 13 can enter the air inlet 512 along the air channel 535, thereby achieving the required air intake requirement; when the air pump 50 stops running, the seal 533 moves downward due to gravity, blocking the air inlet 512.

[0101] In some embodiments, Fig.13 As shown, the groove 534 extends along the radial direction of the support portion 531, which facilitates the airflow to enter the air inlet 512 through the groove 534, so that the gas flows smoothly, avoids airflow loss, ensures the working efficiency of the air pump 50, and has a simple structure and is easy to process and manufacture.

[0102] In some embodiments, there are multiple grooves 534 (greater than or equal to two), and the multiple grooves 534 are arranged at intervals along the circumferential direction of the support portion 531. The multiple grooves 534 can increase the air intake amount flowing to the air inlet 512, thereby ensuring the working efficiency of the air pump 50.

[0103] According to some embodiments of the present invention, Figure 1 , Figure 4 , Figure 6 , Figure 8 , Figure 10-12 As shown, the pump body 51 has a accommodating chamber 513, a connecting channel 514 and an air outlet channel 515. One end of the connecting channel 514 is connected to the air inlet 512 of the pump body 51, and one end of the air outlet channel 515 is configured as an air outlet 511. The end of the connecting channel 514 away from the air inlet 512 and the end of the air outlet channel 515 away from the air outlet 511 are communicated with the accommodating chamber 513, so that the connecting channel 514 and the air outlet channel 515 are communicated with the accommodating chamber 513, thereby connecting the air inlet 512 with the air outlet 511, ensuring that the air flow enters from the air inlet 512, flows through the connecting channel 514, the accommodating chamber 513 and the air outlet channel 515 and flows out from the air outlet 511, thereby meeting the working requirements of the air pump 50.

[0104] In addition, if Figure 1 , Figure 4 , Figure 6 , Figure 8 , Figure 10-12 , Fig.16 As shown, the air pump 50 further includes a second sealing device 54, at least part of which is disposed in the accommodating cavity 513, and the second sealing device 54 can connect or disconnect the connection between the connecting channel 514 and the air outlet channel 515. Thus, when the second sealing device 54 connects the connecting channel 514 and the air outlet channel 515, the normal operation of the air pump 50 can be ensured; when the air pump 50 is not working, the second sealing device 54 disconnects the connection between the connecting channel 514 and the air outlet channel 515, which can prevent the fuel vapor from entering the air pump 50 from the air outlet 511 and flowing out from the air inlet 512 to the third cavity 13, thereby preventing the fuel vapor from entering the first cavity 11 through the third cavity 13, thereby solving the potential safety hazards of the diagnostic module such as explosion and spontaneous combustion from the root, and ensuring the working safety of the diagnostic module.

[0105] In some embodiments of the present invention, Fig.16 As shown, the second sealing device 54 includes a blocking member 541 and a driving mechanism 542. The blocking member 541 is movably disposed in the accommodating chamber 513. At least a portion of the driving mechanism 542 is disposed in the pump body 51. The driving mechanism 542 can drive the blocking member 541 to move, so that the blocking member 541 can connect or disconnect the connection between the connecting channel 514 and the air outlet channel 515, thereby realizing the control requirement of the second sealing device 54 on the connection between the connecting channel 514 and the air outlet channel 515. The driving structure can ensure that the blocking member 541 moves accurately and quickly to meet the required movement requirements, and the structure of the second sealing device 54 is simple and convenient for processing and manufacturing.

[0106] According to some embodiments of the present invention, Figure 1 , Figure 4 , Figure 6 , Figure 8 , Figure 10-12 , Fig.16 As shown, the pump body 51 also has a mounting cavity 516, and the driving mechanism 542 includes a driving motor 61, a cam 62 and a driving plate 63. The driving motor 61 is disposed in the first cavity 11, and the cam 62 is disposed in the mounting cavity 516. The cam 62 is connected to the output shaft 611 of the driving motor 61, so that the driving motor 61 can drive the cam 62 to rotate. The driving plate 63 is disposed in the mounting cavity 516, and the driving plate 63 is connected to the blocking member 541. The driving plate 63 can stop against the outer peripheral wall of the cam 62, and the driving plate 63 and the cam 62 are arranged in the moving direction of the blocking member 541.

[0107] Therefore, when the driving motor 61 is working, the output shaft 611 of the driving motor 61 rotates to drive the cam 62 to rotate, and the cam 62 can drive the driving plate 63 to move, so that the driving plate 63 can drive the blocking member 541 to move, so that the blocking member 541 can connect or disconnect the connection between the connecting channel 514 and the air outlet channel 515, which is convenient for realizing remote control and precise driving of the blocking member 541, which is beneficial to improving the working efficiency and reliability of the air pump 50, and makes the structure of the driving mechanism 542 simple, which is convenient for processing and manufacturing, and is beneficial to reducing production costs.

[0108] In some embodiments of the present invention, Fig.16 As shown, the driving mechanism 542 also includes an elastic member 64, one end of the elastic member 64 is connected or abutted with the driving plate 63, and the other end of the elastic member 64 is connected or abutted with the pump body 51. The elastic member 64 can drive the driving plate 63 to move toward the cam 62 side. Therefore, through the coordinated movement of the elastic member 64 and the cam 62, it is convenient to control the driving plate 63, so that the blocking member 541 can be controlled, and different movement requirements can be achieved, and different use requirements can be met, and the structure is simple, which is conducive to reducing production costs. For example, the elastic member 64 is a thin spring 23.

[0109] For example, when the air pump 50 is running, the output shaft 611 drives the cam 62 to rotate, so that the cam 62 can drive the driving plate 63 to move, and the elastic member 64 can drive the driving plate 63 to move, so that the driving plate 63 can reciprocate, so that the blocking member 541 can reciprocate between the connection and disconnection between the connection channel 514 and the gas outlet channel 515, and when the connection channel 514 and the gas outlet channel 515 are connected, the gas outlet 511 of the air pump 50 can be opened to achieve gas output. For example, each time the air pump 50 is operated, the gas outlet 511 is opened once to achieve gas output.

[0110] In some embodiments, Figure 1 , Figure 4 , Figure 6 , Figure 8 , Figure 10-12 As shown, the elastic member 64 is located in the installation cavity 516, and the elastic member 64 is located on the side of the driving plate 63 away from the blocking member 541, which can make the structure of the driving mechanism 542 compact and help reduce the occupied space.

[0111] According to some embodiments of the present invention, Fig.16 As shown, a sealing portion 543 is provided between the outer peripheral wall of the blocking member 541 and the inner peripheral wall of the accommodating cavity 513. The sealing portion 543 is located on the side of the connecting channel 514 and the air outlet channel 515 close to the driving mechanism 542. The sealing portion 543 can separate the installation cavity 516 and the accommodating cavity 513, and the installation cavity 516 is connected to the external atmosphere.

[0112] Therefore, when the air pump 50 is working, when the air pump 50 builds up a certain pressure, that is, the pressure in the accommodating chamber 513 is greater than the sum of the atmospheric pressure and the pressure of the elastic member 64, the driving plate 63 will move toward the direction close to the mounting chamber 516 under the action of pressure, and compress the spring 23, so that the driving plate 63 can drive the blocking member 541 to move toward the direction close to the mounting chamber 516, so that the blocking member 541 can always be in a state of connecting the connecting channel 514 and the air outlet channel 515, ensuring that the air outlet effect of the air pump 50 is good, and the working efficiency of the air pump 50 can be improved, and the cam 62 can be in an idling state, which is beneficial to extend the service life of the driving motor 61.

[0113] After the air pump 50 is powered off, the pressure in the accommodating chamber 513 gradually decreases. When the pressure in the accommodating chamber 513 is less than the sum of the atmospheric pressure and the pressure of the elastic member 64, the elastic member 64 can restore its deformation and drive the driving plate 63 to move toward the direction close to the accommodating chamber 513, so that the driving plate 63 can drive the blocking member 541 to move toward the direction close to the installation chamber 516, so that the blocking member 541 disconnects the connection between the connecting channel 514 and the air outlet channel 515, thereby achieving the blocking of the air outlet 511 and meeting the required blocking requirements.

[0114] In some embodiments, the sealing portion 543 has an interference fit with the pump body 51, which can ensure that the sealing portion 543 separates the installation cavity 516 and the accommodating cavity 513, facilitates the sealing of the installation cavity 516 and the accommodating cavity 513, ensures reliable sealing, and simple assembly.

[0115] In some embodiments of the present invention, Fig.16As shown, the driving mechanism 542 also includes a connecting member 65, and the two ends of the connecting member 65 in the length direction are respectively connected to the blocking member 541 and the driving plate 63, which can realize the connection between the blocking member 541 and the driving plate 63, ensuring that the connection between the blocking member 541 and the driving plate 63 is more stable and reliable, and the structure is simple, which is easy to process and manufacture. At the same time, the cam 62 is located on the side of the connecting member 65 close to the driving motor 61 (for example Figure 1 The upper side shown in FIG), can make the structure compact, reduce the occupied space, and help improve the space utilization.

[0116] In some embodiments where a sealing portion 543 is provided between the outer peripheral wall of the blocking member 541 and the inner peripheral wall of the accommodating chamber 513, the sealing portion 543, the connecting member 65 and the driving plate 63 can be an integral part, which is simple to manufacture, has high connection strength, reduces assembly processes, and has high production efficiency. Of course, the sealing portion 543, the connecting member 65 and the driving plate 63 can also be separate parts connected together, which is within the scope of protection of the present invention. For example, the sealing portion 543 can be formed as a whole with the connecting member 65, the driving plate 63 and the bracket through two-color injection molding.

[0117] The vehicle according to the embodiment of the present invention includes the diagnostic device 100 according to the embodiment of the present invention. Since the diagnostic device 100 according to the embodiment of the present invention has the above-mentioned beneficial technical effects, the vehicle according to the embodiment of the present invention includes a support member 211 through the coil assembly 21, a support body 31 and an extension 32, the support body 31 is located in the first cavity 11, the extension 32 is connected to the side of the support body 31 facing the second cavity 12 and extends into the second cavity 12, and the valve core assembly 22 is movably arranged in the support body 31 and the extension 32, and along the length direction of the extension 32, at least part of the extension 32 is interference-fitted with the valve core assembly 22. Thus, the gap between the support member 211 and the valve core assembly 22 can be blocked, and the fuel vapor can be effectively prevented from entering the first cavity 11 through the gap between the support member 211 and the valve core assembly 22, thereby solving the safety hazards such as explosion and spontaneous combustion of the diagnostic module from the root, and ensuring the working safety of the diagnostic module.

[0118] The other components and operations of the diagnostic device 100 and the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0119] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0120] In the description of this specification, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0121] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A diagnostic device, characterized in that: The diagnostic device (100) is used to diagnose the evaporation leakage of a fuel tank (200) and comprises: A housing (10), wherein the housing (10) has a first cavity (11) and a second cavity (12); A solenoid valve (20), the solenoid valve (20) comprising a coil assembly (21) and a valve core assembly (22), the coil assembly (21) comprising a support member (211) for winding a coil, the support member (211) comprising a support body (31) and an extension portion (32), the support body (31) being located in the first cavity (11), the extension portion (32) being connected to a side of the support body (31) facing the second cavity (12) and extending into the second cavity (12), the valve core assembly (22) being movably arranged in the support body (31) and the extension portion (32), one end of the valve core assembly (22) in an axial direction being located in the support body (31) and the other end being located in the second cavity (12), and along the length direction of the extension portion (32), at least a portion of the extension portion (32) is interference fit with the valve core assembly (22).

2. The diagnostic device according to claim 1, characterized in that The extension portion (32) comprises: The inclined section (321) has an inner diameter that gradually decreases in the direction from the supporting body (31) to the extending portion (32).

3. The diagnostic device according to claim 2, characterized in that In a cross section along the axial direction of the extension portion (32), an angle between an inner contour line of the inclined section (321) and a central axis of the extension portion (32) is 2°-3°.

4. The diagnostic device according to claim 2, characterized in that In the length direction of the extension portion (32), the height of the inclined section (321) is 1.7 mm-2.3 mm.

5. The diagnostic device according to any one of claims 2 to 4, characterized in that: The extension portion (32) further comprises: A straight section (322), wherein the straight section (322) is connected between the support body (31) and the inclined section (321), and along the length direction of the extension portion (32), the inner diameter of the straight section (322) is constant and is greater than or equal to the maximum inner diameter of the inclined section (321).

6. The diagnostic device according to claim 5, characterized in that The wall thickness of the straight section (322) is 0.4 mm-0.6 mm.

7. The diagnostic device according to claim 1, characterized in that A partition (40) is provided in the shell (10), and the partition (40) is located between the first cavity (11) and the second cavity (12) and is used to separate the first cavity (11) and the second cavity (12). A first sealing ring (41) is provided between the outer peripheral wall of the partition (40) and the inner wall surface of the shell (10).

8. The diagnostic device according to claim 1, characterized in that The housing (10) further comprises a third cavity (13), and the diagnostic device (100) further comprises: An air pump (50), the air pump (50) comprising a pump body (51), the pump body (51) being arranged in the third cavity (13), the air outlet (511) of the pump body (51) being connected to the second cavity (12), and a second sealing ring (52) being arranged between the outer peripheral wall of the pump body (51) and the inner peripheral wall of the third cavity (13).

9. The diagnostic device according to claim 8, characterized in that The air inlet (512) of the pump body (51) is in communication with the third cavity (13), and the air pump (50) further comprises: A first sealing device (53), wherein the first sealing device (53) is arranged at the air inlet (512), and the first sealing device (53) only allows the medium to flow from the third cavity (13) to the air inlet (512), and prevents the medium from flowing from the air inlet (512) to the third cavity (13).

10. The diagnostic device according to claim 9, characterized in that The first sealing device (53) comprises: a limiting portion (532), the limiting portion (532) being arranged on the pump body (51), the limiting portion (532) being spaced apart from the air inlet (512); A sealing member (533), wherein the sealing member (533) is located between the limiting portion (532) and the air inlet (512) and is movable along the axial direction of the air inlet (512), and is used for sealing the air inlet (512).

11. The diagnostic device according to claim 10, characterized in that The first sealing device (53) further comprises: a supporting portion (531), the supporting portion (531) being arranged on a side of the limiting portion (532) close to the air inlet (512) and surrounding the air inlet (512), the supporting portion (531) and the limiting portion (532) being arranged at intervals in the axial direction of the air inlet (512), and the sealing member (533) being located between the supporting portion (531) and the limiting portion (532); A portion of the support portion (531) is recessed in a direction away from the limiting portion (532) to form a groove (534); the depth of the groove (534) is less than the thickness of the support portion (531); and the support portion (531), the sealing member (533) and the limiting portion (532) jointly define an air passage (535).

12. The diagnostic device according to claim 11, characterized in that The groove (534) extends along the radial direction of the support portion (531); And / or, the grooves (534) are multiple and spaced apart along the circumferential direction of the support portion (531).

13. The diagnostic device according to claim 8, characterized in that The pump body (51) has a containing cavity (513), a connecting channel (514) and an air outlet channel (515), one end of the connecting channel (514) is connected to the air inlet (512) of the pump body (51), one end of the air outlet channel (515) is configured as the air outlet (511), and one end of the connecting channel (514) away from the air inlet (512) and one end of the air outlet channel (515) away from the air outlet (511) are in communication with the containing cavity (513), and the air pump (50) further comprises: A second sealing device (54), at least a portion of which is disposed in the accommodating cavity (513), and the second sealing device (54) is used to connect or disconnect the connection between the connecting channel (514) and the air outlet channel (515).

14. The diagnostic device according to claim 13, characterized in that The second sealing device (54) comprises: a blocking member (541), the blocking member (541) being movably disposed in the accommodating cavity (513) and being used to connect or disconnect the communication between the connecting channel (514) and the air outlet channel (515); A driving mechanism (542), at least a portion of which is disposed in the pump body (51) and is used to drive the blocking member (541) to move.

15. The diagnostic device according to claim 14, characterized in that The pump body (51) further comprises a mounting cavity (516), and the driving mechanism (542) comprises: a drive motor (61), wherein the drive motor (61) is disposed in the first cavity (11); A cam (62), the cam (62) being disposed in the mounting cavity (516) and connected to an output shaft (611) of the drive motor (61); A drive plate (63), wherein the drive plate (63) is disposed in the mounting cavity (516) and connected to the blocking member (541), the drive plate (63) being adapted to abut against an outer peripheral wall of the cam (62), and the drive plate (63) and the cam (62) being arranged in a moving direction of the blocking member (541).

16. The diagnostic device according to claim 15, characterized in that The driving mechanism (542) further comprises: An elastic member (64), one end of the elastic member (64) is connected to or abuts the driving plate (63), and the other end is connected to or abuts the pump body (51), and the elastic member (64) is used to drive the driving plate (63) to move toward the cam (62) side.

17. The diagnostic device according to claim 16, characterized in that A sealing portion (543) is provided between the outer peripheral wall of the blocking member (541) and the inner peripheral wall of the accommodating chamber (513); the sealing portion (543) is located on a side of the connecting channel (514) and the air outlet channel (515) close to the driving mechanism (542) to separate the installation chamber (516) from the accommodating chamber (513); the installation chamber (516) is connected to the external atmosphere.

18. The diagnostic device according to claim 15, characterized in that The driving mechanism (542) further comprises: A connecting member (65), wherein both ends of the connecting member (65) in the length direction are respectively connected to the blocking member (541) and the driving plate (63), and the cam (62) is located on a side of the connecting member (65) close to the driving motor (61).

19. The diagnostic device according to claim 8, characterized in that The housing (10) has a main air channel (16), a main hole (17) and a reference hole (18); the main hole (17) and the reference hole (18) are in communication with the second cavity (12) and the main air channel (16); and the main air channel (16) is in communication with the air outlet (511); The diagnostic device (100) has a learning mode. When the diagnostic device (100) is in the learning mode, the valve core assembly (22) closes the main hole (17) and opens the connection between the second cavity (12) and the atmosphere, the air pump (50) drives air into the main air channel (16), and part of the air flows out through the reference hole (18) and the second cavity (12).

20. The diagnostic device according to claim 19, characterized in that The diagnostic device (100) has a diagnostic mode. When the diagnostic device (100) is in the diagnostic mode, the valve core assembly (22) opens the main hole (17) and closes the connection between the second cavity (12) and the atmosphere, and the air pump (50) drives air into the main air passage (16) and into the fuel tank (200) through the reference hole (18) and the main hole (17).

21. The diagnostic device according to claim 1, characterized in that The diagnostic device (100) has an adsorption mode. When the diagnostic device (100) is in the adsorption mode, the second cavity (12) is connected to the fuel tank (200) and the atmosphere.

22. The diagnostic device according to claim 1, characterized in that A carbon canister (300) is provided between the diagnostic device (100) and the fuel tank (200), and the diagnostic device (100) has a desorption mode. When the diagnostic device (100) is in the desorption mode, the second cavity (12) is connected to the atmosphere and to the engine manifold (400) through the carbon canister (300), and air only flows from the second cavity (12) to the engine manifold (400).

23. A vehicle, characterized in that: Comprising a diagnostic device (100) according to any one of claims 1-22.

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