Device for detecting electromagnetic field intensity of vehicle on track and vehicle-mounted equipment thereof

Abstract

The utility model discloses a device for detecting the electromagnetic field intensity of a vehicle on a track and vehicle-mounted equipment of the vehicle, and belongs to the field of track traffic. The rail comprises a grounding rail and a power supply rail, the device comprises an annular detection loop, an open circuit is kept between a cable of the annular detection loop and the power supply rail, one part of the cable is laid around the grounding rail, and the other part of the cable is arranged on one side of the rail; wherein a current sensor is connected in series in the annular detection loop, and the current sensor is connected with a data recorder. According to the utility model, effective detection of the electromagnetic field intensity of the vehicle and the vehicle-mounted equipment thereof is realized, installation is easy, and cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail transportation, and in particular relates to an electromagnetic field strength detection device for a vehicle on a track and its onboard equipment. Background Art

[0002] The People Mover system is a fully automated, unmanned, low- to medium-capacity rail transit system. Both vehicle power supply and return current are provided via a third rail, with a separate ground rail designed to prevent stray current issues. The system's autonomous driving functionality is achieved through wireless communication between vehicles and trackside signaling equipment. Currently, urban rail transit in my country generally uses the 2.4 GHz wireless frequency band. The ISM 2.4 GHz band is a free, publicly accessible frequency band, and therefore cannot guarantee complete immunity from external interference. To ensure interference-free wireless communication, it is necessary to analyze potential interference sources and conduct appropriate testing to verify the reliability of wireless communication.

[0003] In order to detect the interference of vehicles and their onboard equipment on the vehicle-ground wireless communication system, it is necessary to test the electromagnetic field strength generated by the vehicles and their onboard equipment during operation, and analyze whether the trackside signal wireless communication equipment can work normally in this electromagnetic field strength environment.

[0004] The comparative document (CN107741541A) discloses a near-field test method for the electromagnetic field strength inside a rail transit vehicle. First, by collecting electromagnetic signals at a target position while the rail transit vehicle is running, an electromagnetic signal corresponding to the radiation intensity of any specified position in the electromagnetic field environment of each component in the rail transit vehicle is obtained; then, the electromagnetic signal is subjected to interference removal, frequency mixing conversion, filtering, and detection processing to obtain a valid electromagnetic signal, and the electromagnetic field strength value corresponding to the valid electromagnetic signal is obtained, which can provide a reference for testers. It can be seen that this test method can effectively evaluate the radiation intensity of the electromagnetic environment in which each component is located by collecting electromagnetic signals at the target position after the components and equipment are installed on the vehicle, so as to guide the reasonable layout of each component and equipment inside the vehicle.

[0005] However, the above-mentioned comparative documents mainly focus on the analysis after obtaining the electromagnetic field strength, and do not provide a specific plan for the detection device and layout of the electromagnetic field strength. Utility Model Content

[0006] The utility model aims to overcome the shortcomings of the existing technology and proposes an electromagnetic field strength detection device for vehicles on track and their on-board equipment to achieve the following purposes: to effectively detect the electromagnetic field strength of vehicles and their on-board equipment, while being easy to install and reducing costs.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A device for detecting the electromagnetic field strength of a vehicle on a track and its onboard equipment, the track comprising a ground rail and a power supply rail. The device comprises a ring-shaped detection loop, wherein a cable of the ring-shaped detection loop is disconnected from the power supply rail. A portion of the cable is laid around the ground rail, and another portion is arranged on one side of the track. A current sensor is connected in series with the ring-shaped detection loop, and the current sensor is connected to a data recorder.

[0009] Preferably, the length of the ground rail surrounded by the cables of the annular detection loop is at least the length of one vehicle.

[0010] Preferably, the cable of the annular detection loop is a single-core cable without a shielding layer.

[0011] Preferably, at least two current sensors are connected in series on the annular detection loop, and all the current sensors are connected to the data recorder.

[0012] Preferably, the current sensor adopts a flexible current probe, including a Rohde & Schwarz flexible current loop.

[0013] Preferably, the current sensor and the data recorder are connected via a coaxial cable.

[0014] Preferably, the current sensor is connected in series in the annular detection loop and is located on one side of the track.

[0015] The technical effects of the utility model are:

[0016] (1) The annular detection loop of the present application is arranged around the ground rail and does not contact the power supply rail, so that the entire annular detection loop is a passive line. Its function is to generate an induced current on the annular detection loop through the electromagnetic induction of the vehicle entering and exiting, so as to detect the electromagnetic field strength of the vehicle through the induced current. The overall structure is simple and easy to arrange, which reduces the cost.

[0017] (2) The present application can be deployed in a vehicle factory during vehicle commissioning. During the commissioning period, the electromagnetic field strength of the vehicle and its onboard equipment can be detected through the device of the present application, thereby discovering and addressing risks as early as possible, saving rectification and design costs, saving project costs, and improving the reliability of vehicle products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of an electromagnetic field strength detection device for a track vehicle and its onboard equipment according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0019] The following is a detailed description of the specific embodiments of the present invention by referring to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution of the present invention and to facilitate its implementation. To make the technical solution of the present invention more clear, the present invention is explained through the following embodiments.

[0020] This embodiment proposes an electromagnetic field strength detection device for a vehicle on a track and its onboard equipment, wherein the track includes a ground rail and a power supply rail. Figure 1 As shown, the track of this embodiment includes two ground rails. The device includes a ring detection loop, the cables of which are disconnected from the power rails to prevent contact with the power rails. A portion of the cables of the ring detection loop is laid around the ground rails, ensuring a secure and reliable laying. The remaining portion is set aside on one side of the track as a reserved cable to facilitate the connection of other electronic and electrical equipment.

[0021] In this embodiment, a current sensor is connected in series within the circular detection loop. To ensure the safety of the current sensor, the current sensor is connected in series to one side of the track within the loop. The current sensor is connected to a data recorder, which records the detection data of the current sensor for subsequent analysis.

[0022] In this embodiment, the length of the ground rail surrounded by the cables of the annular detection loop is at least the length of one vehicle, thereby ensuring that the emission field strength of at least one vehicle can be detected and sensed by the annular detection loop during the test.

[0023] The cable of the ring detection loop in this embodiment uses a single-core cable without a shielding layer. The working principle of the ring detection loop is that when a train travels from the inside of the loop to the outside of the loop, or from the outside of the loop into the inside of the loop, the change in the electromagnetic field strength within the loop will generate an induced potential, thereby generating an induced current in the loop. The shielding layer will interfere with the electromagnetic induction and affect the accuracy of the induced current measurement. Therefore, this embodiment uses an unshielded single-core cable to ensure the free propagation of the electromagnetic field and enhance the induction effect. At the same time, unshielded single-core cables are generally lighter and more flexible, and the installation process is simple.

[0024] In this embodiment, at least two current sensors (two for example) are connected in series in the annular detection loop, and all current sensors are connected to the data recorder. The advantage of having two current sensors is that if one current sensor fails, the other current sensor can continue to operate. Furthermore, under normal operating conditions, the data collected by the two current sensors can form a redundant backup to ensure the accuracy of electromagnetic field strength detection.

[0025] Specifically, the current sensor of this embodiment uses a flexible current probe, including a Rohde & Schwarz flexible current loop, etc. Flexible current probes have advantages such as flexibility, safety, and high precision, which can provide convenience for engineers and technicians and make current measurement more efficient and accurate.

[0026] After the current sensor collects the induced current in the ring detection loop, it is connected to a data recorder, which records and saves the induced current data as the train passes through the coil. In this embodiment, the current sensor and data recorder are connected via a coaxial cable. Coaxial cable has strong anti-interference capabilities and ensures stable and complete data output.

[0027] Finally, by analyzing the induced current data recorded in the data recorder, such as through Fourier transform, we can obtain a spectrum diagram of the induced current. This can be used to analyze the interference frequency that may affect the vehicle-ground wireless communication, find the on-board equipment that generates the interference frequency, and guide the vehicle and equipment manufacturers to carry out electromagnetic compatibility rectification, thereby improving the electromagnetic compatibility design capabilities of vehicles and on-board equipment.

[0028] The utility model can timely discover interference between vehicles and their on-board equipment during factory debugging, and make timely corrections, thereby avoiding operational accidents caused by vehicle-to-ground wireless interference after vehicle delivery. It is a manifestation of electromagnetic compatibility forward design, and at the same time reduces design correction costs for vehicle and equipment manufacturers, and improves the reliability of vehicles and their on-board equipment.

[0029] The above description of the present invention is provided as an example, in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any application of the above-described concepts and technical solutions of the present invention to other situations without modification, are all within the scope of protection of the present invention.

Claims

1. An electromagnetic field strength detection device for a vehicle on a track and its onboard equipment, wherein the track includes a ground rail and a power supply rail, characterized in that: The device includes a ring detection loop, wherein the cable of the ring detection loop is kept disconnected from the power supply rail, a portion of the cable is laid around the ground rail, and another portion is arranged on one side of the rail; wherein a current sensor is connected in series in the ring detection loop, and the current sensor is connected to a data recorder.

2. The electromagnetic field strength detection device for a rail vehicle and its onboard equipment according to claim 1, characterized in that: The length of the ground rail surrounded by the cables of the annular detection loop is at least the length of one vehicle.

3. The electromagnetic field strength detection device for a rail vehicle and its onboard equipment according to claim 1 or 2, characterized in that: The cable of the annular detection loop is a single-core cable without a shielding layer.

4. The electromagnetic field strength detection device for a rail vehicle and its onboard equipment according to claim 1, characterized in that: At least two current sensors are connected in series on the annular detection loop, and all the current sensors are connected to the data recorder.

5. The electromagnetic field strength detection device for a rail vehicle and its onboard equipment according to claim 1 or 4, characterized in that: The current sensor adopts a flexible current probe, including a Rohde & Schwarz flexible current loop.

6. The electromagnetic field strength detection device for a rail vehicle and its onboard equipment according to claim 1 or 4, characterized in that: The current sensor and the data recorder are connected via a coaxial cable.

7. The electromagnetic field strength detection device for a rail vehicle and its onboard equipment according to claim 1 or 4, characterized in that: The current sensor is connected in series in the annular detection loop and is located on one side of the track.

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