Solenoid valve, solenoid valve fault detection method, detection system, engine and vehicle

Abstract

The invention discloses an electromagnetic valve, an electromagnetic valve fault detection method, an electromagnetic valve fault detection system, an engine and a vehicle. The electromagnetic valve comprises a body, a valve element assembly, an electromagnetic coil, a first pin and a second pin, and the body is provided with a valve cavity; the valve element assembly is movably arranged in the valve cavity, the electromagnetic coil is arranged on the body and used for controlling the valve element assembly to move, the first pin and the second pin are both arranged on the body, the first pin is electrically connected with the valve element assembly, the first pin comprises a first connecting part, and the second pin comprises a second connecting part. The first pin comprises a contact part and a first connecting part, the second pin comprises a contact part and a second connecting part, the contact part is used for being in contact conduction with the valve element assembly, and the first connecting part and the second connecting part are respectively used for being connected with a circuit on-off tester so as to detect whether the first pin and the second pin are conducted or not. According to the electromagnetic valve, the system arrangement is simple, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and in particular to a solenoid valve, a solenoid valve fault detection method, a detection system, an engine, and a vehicle. Background Art

[0002] The Piston Cooling Jet (PCJ) is a device used in gasoline-powered vehicle engines to cool the pistons by spraying oil. The PCJ is connected to a solenoid valve. A PWM control signal shifts the valve core under electromagnetic force, controlling the opening and closing of the PCJ. This adjusts the amount of fuel injected by the PCJ under different engine operating conditions, cooling the piston and reducing fuel consumption.

[0003] In related technologies, when a solenoid valve is in use, a pressure monitoring device is generally set downstream of the solenoid valve. The pressure monitoring device detects whether the oil pressure in the pipeline is within the normal range to determine whether the solenoid valve has failed. However, this will increase the number of system components, resulting in complex system layout and high costs. Summary of the Invention

[0004] The present disclosure aims to solve at least one of the technical problems in the related art to a certain extent. To this end, embodiments of the present disclosure provide a solenoid valve, a solenoid valve fault detection method, a detection system, an engine, and a vehicle.

[0005] The solenoid valve of the embodiment of the present disclosure includes a body, a valve core assembly, an electromagnetic coil, a first pin and a second pin, the body having a valve cavity; the valve core assembly is movably arranged in the valve cavity; the electromagnetic coil is arranged on the body to control the movement of the valve core assembly; the first pin and the second pin are both arranged on the body, the first pin is electrically connected to the valve core assembly, the first pin includes a first connecting portion, the second pin includes a resistance portion and a second connecting portion, the resistance portion is used to contact and connect with the valve core assembly, the first connecting portion and the second connecting portion are respectively used to be connected to a circuit tester to detect whether there is conduction between the first pin and the second pin.

[0006] In some embodiments, the valve core assembly includes a valve core, a magnetic core, a sleeve and a sliding shaft, the sleeve is connected to the body, the sliding shaft can slidably cooperate with the sleeve, the valve core and the magnetic core are respectively arranged at both ends of the sliding shaft, the magnetic core is used to contact and conduct with the interference part of the second pin, and the first pin is electrically connected to the sleeve.

[0007] In some embodiments, the first pin includes a first straight segment, a bent segment, and a second straight segment, one end of the first straight segment extends into the valve cavity perpendicular to the sliding shaft and is electrically connected to the sliding sleeve, the other end of the first straight segment is connected to the second straight segment through the bent segment, the second straight segment is parallel to the first straight segment and extends in a direction away from the sliding sleeve, and the first connecting portion is provided on the second straight segment.

[0008] In some embodiments, the body has a first end and a second end axially opposite to each other along the sliding axis, the first end has a liquid inlet and a liquid outlet connected to the valve cavity, the valve core is arranged adjacent to the first end for opening or closing the liquid inlet, and the second pin is arranged at the second end.

[0009] In some embodiments, the second pin includes a first section and a second section connected to each other, at least a portion of the first section is placed outside the valve cavity and forms the second connecting portion, and at least a portion of the second section is placed inside the valve cavity and forms the interference portion.

[0010] In some embodiments, the extending direction of the first section is perpendicular to the axial direction of the sliding shaft, and the first section and the second section are arranged at an angle.

[0011] In some embodiments, the angle between the first segment and the second segment is 30°-60°.

[0012] In some embodiments, the solenoid valve of the embodiment of the present disclosure includes a plug connector, which is connected to the body, the second pin is provided on the plug connector, and the second connecting portion is located in the plug slot.

[0013] In some embodiments, the plug connector has a plug-in portion, the extension direction of the plug-in portion is perpendicular to the extension direction of the plug-in groove, the plug-in portion is inserted on the main body along the axial direction of the sliding shaft, the plug-in portion has an accommodating cavity connected to the valve cavity, and the interference portion is located in the accommodating cavity.

[0014] The solenoid valve fault detection method according to the embodiment of the present disclosure includes the following steps:

[0015] selectively opening or closing the solenoid valve and detecting the connection status between the first pin and the second pin;

[0016] If the connection state between the first pin and the second pin is opposite to a preset state, it is determined that the solenoid valve has a fault.

[0017] The detection system of the embodiment of the present disclosure includes the solenoid valve described in any of the above embodiments.

[0018] The engine of the embodiment of the present disclosure includes the detection system described in any of the above embodiments.

[0019] The vehicle of the embodiment of the present disclosure includes the engine described in any of the above embodiments.

[0020] When the solenoid valve of the embodiment of the present disclosure is in use, the first connection portion of the first pin and the second connection portion of the second pin are respectively connected to a circuit continuity tester, and the solenoid valve is selectively opened or closed to detect whether there is conduction between the first pin and the second pin. If the connection state between the first pin and the second pin is opposite to the preset state when the solenoid valve is in the open state or the closed state, it is determined that there is a fault in the solenoid valve in the open state or the closed state, so that the solenoid valve of the embodiment of the present disclosure has a self-diagnosis function. Compared with the related art, when the solenoid valve of the embodiment of the present disclosure is in use, there is no need to set a pressure monitoring device for monitoring the working state of the solenoid valve downstream of the solenoid valve, which simplifies the system layout and also reduces the system cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of a solenoid valve according to an embodiment of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the solenoid valve according to an embodiment of the present invention when the valve core is in a closed position.

[0023] Figure 3 It is a structural schematic diagram of the solenoid valve according to an embodiment of the present invention when the valve core is in the open position.

[0024] Figure 4 4 is a flow chart of a solenoid valve fault detection method according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] 100. Solenoid valve; 1. Main body; 101. Valve chamber; 102. First end; 1021. Liquid inlet; 1022. Liquid outlet; 103. Second end; 2. Solenoid coil; 3. First pin; 301. First connecting portion; 302. First straight segment; 303. Bend segment; 304. Second straight segment; 4. Second pin; 401. Interference portion; 402. Second connecting portion; 403. First segment; 404. Second segment; 5. Valve core; 6. Magnetic core; 7. Sleeve; 8. Sliding shaft; 9. Plug connector; 901. Plug slot; 902. Plug connector; 9021. Accommodating chamber; 903. Snap-fit ​​protrusion; 10. Return spring. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0028] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0029] like Figures 1 to 4 As shown, the solenoid valve 100 of the embodiment of the present invention includes a body 1, a valve core assembly, an electromagnetic coil 2, a first pin 3, and a second pin 4. The body 1 has a valve cavity 101, the valve core assembly is movably disposed in the valve cavity 101, and the electromagnetic coil 2 is disposed on the body 1 to control the movement of the valve core assembly.

[0030] The first pin 3 and the second pin 4 are both provided on the main body 1. The first pin 3 is electrically connected to the valve core assembly. The first pin 3 includes a first connecting portion 301. The second pin 4 includes a contact portion 401 and a second connecting portion 402. The contact portion 401 is used to contact and conduct with the valve core assembly. The first connecting portion 301 and the second connecting portion 402 are respectively used to be connected to a circuit continuity tester to detect whether there is conduction between the first pin 3 and the second pin 4.

[0031] During use, the solenoid valve 100 according to the embodiment of the present invention is selectively opened or closed by connecting the first connection portion 301 of the first pin 3 and the second connection portion 402 of the second pin 4 to a circuit continuity tester to test whether there is continuity between the first pin 3 and the second pin 4. If the connection between the first pin 3 and the second pin 4 is different from the preset state when the solenoid valve 100 is in the open or closed state, it is determined that the solenoid valve 100 is faulty in the open or closed state.

[0032] Specifically, if Figure 1 As shown, the technical solution of the present application is described in detail using the normally open solenoid valve 100 as an example. When the electromagnetic coil 2 is powered off, the solenoid valve 100 is in the open state, and the valve core assembly moves upward under the action of the return spring 10 and the hydraulic oil, so that the valve core assembly stops on the abutment portion 401 of the second pin 4 and is in contact with the abutment portion 401, thereby achieving electrical connection between the first pin 3 and the second pin 4, so that the electrical circuit formed between the first pin 3 and the second pin 4 should be a passage. When the circuit between the first pin 3 and the second pin 4 is diagnosed as being open, it can be determined that the valve core assembly is stuck in the valve chamber 101 and is not in the open state. At this time, the solenoid valve 100 is diagnosed as a fault in the open state.

[0033] When the electromagnetic coil 2 is energized, the solenoid valve 100 is in the closed state. The valve core assembly moves downward under the magnetic force of the electromagnetic coil 2 and compresses the return spring 10, causing the valve core assembly to separate from the contact portion 401 of the second pin 4, thereby disconnecting the electrical circuit formed between the first pin 3 and the second pin 4. If the diagnosis shows that there is a connection between the first pin 3 and the second pin 4, it can be determined that the valve core assembly has not properly separated from the contact portion 401 of the second pin 4. In this case, the solenoid valve 100 is diagnosed as faulty in the closed state.

[0034] Thus, the solenoid valve 100 of the present invention provides a first pin 3 and a second pin 4. Based on whether the connection between the first pin 3 and the second pin 4 is opposite to the preset state when the solenoid valve 100 is in the open or closed state, the valve core assembly can be determined to be in the normal position, thereby diagnosing whether the solenoid valve 100 has malfunctioned. This provides the solenoid valve 100 of the present invention with a self-diagnostic function. Compared to related art, the solenoid valve 100 of the present invention does not require a pressure monitoring device downstream of the solenoid valve 100 to monitor its operating status, simplifying the system layout and reducing system costs.

[0035] In some embodiments, as Figures 1 to 3 As shown, the valve core assembly includes a valve core 5, a magnetic core 6, a sliding sleeve 7, and a sliding shaft 8. The sliding sleeve 7 is connected to the body 1, and the sliding shaft 8 is slidably engaged with the sliding sleeve 7. The valve core 5 and the magnetic core 6 are respectively disposed at opposite ends of the sliding shaft 8. The magnetic core 6 is configured to contact and conduct with the abutment portion 401 of the second pin 4, and the first pin 3 is electrically connected to the sliding sleeve 7. The first pin 3 utilizes the existing internal structure of the solenoid valve 100 to achieve electrical communication with the second pin 4 via the sliding sleeve 7, sliding shaft 8, and magnetic core 6. This can reduce the number of components of the solenoid valve 100, simplify the internal structure of the solenoid valve 100, and reduce the manufacturing cost of the solenoid valve 100.

[0036] In some embodiments, the first pin 3 includes a first straight segment 302, a bent segment 303 and a second straight segment 304. One end of the first straight segment 302 extends into the valve cavity 101 perpendicular to the sliding shaft 8 and is electrically connected to the sleeve 7. The other end of the first straight segment 302 is connected to the second straight segment 304 through the bent segment 303. The second straight segment 304 is parallel to the first straight segment 302 and extends in a direction away from the sleeve 7. The first connecting portion 301 is arranged on the second straight segment 304.

[0037] like Figure 1As shown, the bent section 303 is perpendicular to the first straight section 302 and the second straight section 304, and the bent section 303 is parallel to the central axis of the sliding shaft 8. This structure of the first pin 3 makes the solenoid valve 100 more flexible in structure and also facilitates the installation of the solenoid valve 100, allowing the solenoid valve 100 to better adapt to different installation environments, thereby improving the installation efficiency of the solenoid valve 100.

[0038] Optionally, the first connection portion 301 is a connection hole. When the solenoid valve 100 according to the embodiment of the present invention is installed on a vehicle's engine, the first pin 3 can be electrically connected to the vehicle's ground through the connection hole, and the second connection portion 402 of the second pin 4 can be connected to the positive electrode of the power supply through the engine's ECU control system. The engine's ECU control system can detect and determine whether the connection state between the first pin 3 and the second pin 4 is opposite to a preset state, thereby quickly determining whether the solenoid valve 100 is in a normal state.

[0039] In some embodiments, as Figure 1 As shown, the main body 1 has a first end 102 and a second end 103 axially opposite to each other along the sliding shaft 8, the first end 102 has a liquid inlet 1021 and a liquid outlet 1022 connected to the valve cavity 101, the valve core 5 is arranged adjacent to the first end 102 for opening or closing the liquid inlet 1021, and the second pin 4 is arranged at the second end 103.

[0040] The second pin 4 is arranged at the second end 103 of the main body 1, that is, the second pin 4 is arranged at a position on the main body 1 away from the liquid inlet 1021 and the liquid outlet 1022, which can reduce the risk of the second pin 4 contacting the hydraulic oil in the liquid inlet 1021 and the liquid outlet 1022, and avoid the hydraulic oil affecting the conductive performance of the second pin 4, thereby greatly improving the working reliability of the solenoid valve 100 of the embodiment of the present invention.

[0041] In some embodiments, the second pin 4 includes a first section 403 and a second section 404 connected to each other, at least a portion of the first section 403 is placed outside the valve cavity 101 and forms a second connecting portion 402, and at least a portion of the second section 404 is placed inside the valve cavity 101 and forms a contact portion 401. Figure 2 and Figure 3 As shown, by setting the second pin 4 into a two-stage type, the structure of the second pin 4 is simple, and the second pin 4 can be injection molded on the body 1 of the solenoid valve 100 by injection molding, which is easy to carry out large-scale production and reduce production costs.

[0042] In some embodiments, the extension direction of the first section 403 is perpendicular to the axial direction of the sliding shaft 8, and the first section 403 and the second section 404 are arranged at an angle. Figure 2 and Figure 3As shown, since the first section 403 and the second section 404 are arranged at an angle, the second section 404 has a certain elastic deformation ability. When the valve core assembly stops on the interference part 401 on the second section 404, the impact force of the valve core assembly on the interference part 401 can be reduced, avoiding the rigid collision between the valve core assembly and the interference part 401 and damaging the structure of the interference part 401, which is beneficial to improving the service life of the second pin 4.

[0043] Optionally, the second pin 4 is made of copper and has a metal coating on its surface. It is understood that copper is a soft metal with good ductility and high conductivity. The copper surface can be plated with a metal coating such as gold or silver to increase the wear resistance of the second pin 4, further facilitating a longer service life of the second pin 4.

[0044] Optionally, the angle between the first section 403 and the second section 404 is 30°-60°. For example, the angle between the first section 403 and the second section 404 is 30°, 45° or 60°. If the angle between the first section 403 and the second section 404 is set too small, when the magnetic core 6 stops at the abutment portion 401, it is easy to cause irreversible deformation of the second section 404, affecting its working reliability. If the angle between the first section 403 and the second section 404 is set too large, when the magnetic core 6 contacts the abutment portion 401, it is easy to cause the second section 404 to be difficult to deform, making it easy for the magnetic core 6 to have a rigid contact collision with the abutment portion 401, affecting the service life of the magnetic core 6 and the second pin 4.

[0045] Optionally, the second stitch 4 is in a sheet shape, and the thickness of the second stitch 4 is 3 mm-5 mm.

[0046] For example, the thickness of the second pin 4 is 3 mm, 4 mm, or 5 mm. The thickness of the second pin 4 can be specifically designed according to the size of the magnetic core 6 of the solenoid valve 100. If the thickness of the second pin 4 is set too small, the second pin 4 will be insufficiently rigid and may cause irreversible deformation. If the thickness of the second pin 4 is set too large, the second pin 4 will be insufficiently flexible and may collide with the magnetic core 6, thereby reducing the service life of the magnetic core 6. Therefore, the second pin 4 can be set in a sheet shape and its thickness can be set within a certain range to meet the requirements of flexibility and rigidity.

[0047] In some embodiments, the solenoid valve 100 of the embodiment of the present invention includes a plug connector 9, which is connected to the body 1, has a plug slot 901, the second pin 4 is provided on the plug connector 9, and the second connecting portion 402 is located in the plug slot 901.

[0048] like Figure 2 and Figure 3As shown, by providing a plug-in slot 901 on the plug connector 9 and extending the second connection portion 402 of the second pin 4 into the plug-in slot 901, the plug-in slot 901 can protect the second connection portion 402 and prevent the risk of the second connection portion 402 being deformed and broken by collision with objects, which is beneficial to improving the safety of the solenoid valve 100.

[0049] In some embodiments, the plug connector 9 has a plug portion 902 extending perpendicularly to the direction of extension of the plug slot 901. The plug portion 902 is inserted into the body 1 along the axial direction of the sliding shaft 8. The plug portion 902 has an accommodating cavity 9021, and the abutting portion 401 is located within the accommodating cavity 9021. The accommodating cavity 9021 is in communication with the valve cavity 101.

[0050] like Figures 1 to 3 As shown, the extension direction of the plug portion 902 is perpendicular to the extension direction of the plug groove 901. When the plug portion 902 is inserted into the body 1, it helps to ensure the stability and accuracy of the insertion of the plug portion 902, thereby improving the assembly efficiency between the plug connector 9 and the body 1. Because the plug portion 902 is provided with a receiving cavity 9021 for accommodating the interference portion 401, the sliding shaft 8 can enter the receiving cavity 9021 from the valve cavity 101 and communicate with the interference portion 401, making the plug connector 9 simple in structure and easy to install.

[0051] Optionally, the plug connector 9 has a snap-fit ​​protrusion 903 for plugging with an electrical component. The embodiment of the present invention utilizes the snap-fit ​​protrusion 903 on the plug connector 9 to achieve a quick connection with the electrical component, which is beneficial to improving the installation efficiency of the solenoid valve 100.

[0052] The fault detection method of the solenoid valve 100 according to an embodiment of the present invention, wherein the solenoid valve 100 is the solenoid valve 100 described in any of the above embodiments, comprises the following steps:

[0053] S1: selectively opening or closing the solenoid valve 100 and detecting the connection status between the first pin 3 and the second pin 4;

[0054] S2: If the connection state between the first pin 3 and the second pin is opposite to the preset state, it is determined that the solenoid valve 100 has a fault.

[0055] Specifically, a normally open solenoid valve is taken as an example to describe in detail the fault detection method of the solenoid valve 100 according to an embodiment of the present invention.

[0056] When the electromagnetic coil 2 is powered off, the electromagnetic valve 100 is in the open state, and there should be a passage between the first pin 3 and the second pin 4. However, when it is detected that there is a break in the circuit between the first pin 3 and the second pin 4, it is determined that the electromagnetic valve 100 is faulty in the open state.

[0057] When the electromagnetic coil 2 is energized and the electromagnetic valve 100 is in the closed state, there should be an open circuit between the first pin 3 and the second pin 4. However, when it is detected that there is a connection between the first pin 3 and the second pin 4, it is determined that the electromagnetic valve 100 is faulty in the closed state.

[0058] Thus, the solenoid valve fault detection method according to the embodiment of the present invention can determine whether the solenoid valve 100 has failed by determining whether the connection state between the first pin 3 and the second pin 4 is opposite to a preset state when the solenoid valve 100 is in the open or closed state. This eliminates the need to separately install a pressure monitoring device downstream of the solenoid valve 100 to monitor the oil pressure in the pipeline. This allows the solenoid valve fault detection method according to the embodiment of the present invention to accurately and quickly identify faults in the solenoid valve 100, thereby improving the stability and safety of equipment operation.

[0059] The detection system of the embodiment of the present invention includes the solenoid valve 100 fault detection method described in any of the above embodiments, so that the detection system of the embodiment of the present invention can accurately and quickly identify the fault of the solenoid valve 100 and improve the stability and safety of the equipment operation.

[0060] An engine according to an embodiment of the present invention includes the detection system described in any of the aforementioned embodiments. When the detection system according to an embodiment of the present invention is used on an engine, there is no need to separately install a pressure monitoring device downstream of the solenoid valve 100 to monitor the oil pressure in the pipeline. Compared to related technologies, this not only reduces the number of engine components, simplifying the overall engine layout, but also eliminates the costs of processing, manufacturing, transporting, and assembling the pressure monitoring device, resulting in a lower engine cost.

[0061] The vehicle of the present invention includes the engine described in any one of the above embodiments. Therefore, the vehicle of the embodiment of the present invention has the advantages of simple overall layout and low cost.

[0062] 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 to 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0064] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0065] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0066] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean 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 expressions of the above terms do 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. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0067] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A solenoid valve, characterized in that: include: a body having a valve cavity; a valve core assembly, the valve core assembly being movably disposed in the valve cavity; an electromagnetic coil, the electromagnetic coil being provided on the body and being used for controlling the movement of the valve core assembly; A first pin and a second pin, the first pin and the second pin are both arranged on the body, the first pin is electrically connected to the valve core assembly, the first pin includes a first connecting portion, the second pin includes a resisting portion and a second connecting portion, the resisting portion is used to contact and conduct with the valve core assembly, the first connecting portion and the second connecting portion are respectively used to be connected to a circuit continuity tester to detect whether there is conduction between the first pin and the second pin.

2. The solenoid valve according to claim 1, characterized in that The valve core assembly includes a valve core, a magnetic core, a sliding sleeve and a sliding shaft. The sliding sleeve is connected to the body. The sliding shaft can slidably cooperate with the sliding sleeve. The valve core and the magnetic core are respectively arranged at both ends of the sliding shaft. The magnetic core is used to contact and conduct with the interference part of the second pin, and the first pin is electrically connected to the sliding sleeve.

3. The solenoid valve according to claim 2, characterized in that The first pin includes a first straight segment, a bent segment and a second straight segment. One end of the first straight segment extends into the valve cavity perpendicular to the sliding shaft and is electrically connected to the sliding sleeve. The other end of the first straight segment is connected to the second straight segment through the bent segment. The second straight segment is parallel to the first straight segment and extends in a direction away from the sliding sleeve. The first connecting portion is provided on the second straight segment.

4. The solenoid valve according to claim 2, characterized in that The body has a first end and a second end axially opposite to each other along the sliding shaft, the first end has a liquid inlet and a liquid outlet connected to the valve cavity, the valve core is arranged adjacent to the first end for opening or closing the liquid inlet, and the second pin is arranged at the second end.

5. The solenoid valve according to claim 2, characterized in that The second pin includes a first section and a second section that are connected. At least a portion of the first section is located outside the valve cavity and forms the second connecting portion. At least a portion of the second section is located inside the valve cavity and forms the interference portion.

6. The solenoid valve according to claim 5, characterized in that The extending direction of the first section is perpendicular to the axial direction of the sliding shaft, and the first section and the second section are arranged at an angle.

7. The solenoid valve according to claim 6, characterized in that The angle between the first section and the second section is 30°-60°.

8. The solenoid valve according to claim 2, characterized in that The invention comprises a plug connector, wherein the plug connector is connected to the body and has a plug slot. The second pin is arranged on the plug connector, and the second connecting portion is located in the plug slot.

9. The solenoid valve according to claim 8, characterized in that The plug connector has a plug-in portion, the extension direction of the plug-in portion is perpendicular to the extension direction of the plug-in slot, the plug-in portion is inserted on the main body along the axial direction of the sliding shaft, the plug-in portion has an accommodating cavity connected to the valve cavity, and the interference portion is located in the accommodating cavity.

10. A solenoid valve fault detection method, characterized in that: The solenoid valve is a solenoid valve according to any one of claims 1 to 9, The following steps are involved: selectively opening or closing the solenoid valve and detecting the connection status between the first pin and the second pin; If the connection state between the first pin and the second pin is opposite to a preset state, it is determined that the solenoid valve has a fault.

11. A solenoid valve fault detection system, characterized in that: The solenoid valve comprises the solenoid valve according to any one of claims 1 to 9.

12. An engine, characterized in that: The invention comprises the solenoid valve fault detection system described in claim 11.

13. A vehicle, characterized in that: Including the engine described in claim 12.

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