Magnetic field safety detection method, system and device, and storage medium

Abstract

A magnetic field safety detection method, system and device, and a storage medium. The method comprises: S1, performing magnetic detection by means of a plurality of Hall sensors (10), and outputting a plurality of Hall sensor signals; S2, providing a plurality of central processing units (CPUs) (20), and each CPU (20) acquiring a plurality of Hall sensor signals; S3, comparing with a brake threshold the plurality of Hall sensor signals acquired by the plurality of CPUs (20); and S4, when there is one or more signals exceeding the brake threshold among the plurality of Hall sensor signals, outputting a brake signal. By means of magnetic field safety detection based on a Hall effect, a train operation control system having a higher speed can be adapted to; the response speed of a magnetoelectric mode is faster; two Hall sensors (10) perform symmetric mutual detection; and the reliability of a detection method in which dual-CPU two-out-of-two is used is higher.

Description

A magnetic field safety detection method, system, device and storage medium Technical Field

[0001] The embodiments of the present disclosure relate to the field of train operation control technology, and in particular to a magnetic field safety detection method, system, device, and storage medium. Background Art

[0002] The magnetic field safety detection method based on the Hall effect can be applied to magnetic detection train operation control systems. Its main function is to detect in real time whether there is a magnetic field on the ground that prohibits operation. If a magnetic field is detected, the train will be emergency braked to control the train to stop in a safe area. The magnetic field safety detection method based on the Hall effect can reliably detect the magnetic field signal on the ground to prevent the train from entering or exiting. The current on-board antenna of the magnetic parking system is based on the principle of ferromagnetic relays. There is no magnetic parking train control system based on the Hall effect for magnetic field safety detection. The current magnetic parking system based on mechanical relays has the following main problems:

[0003] 1. When the magnetic field detection range is small and the ground magnetic field strength is low, the magnetic field energy is insufficient to drive the ferromagnetic relay contacts to operate.

[0004] 2. The vehicle sensing antenna is based on relay operation, which is not conducive to interfacing with computer control systems.

[0005] Summary of the Invention

[0006] The embodiments of the present disclosure provide a magnetic field safety detection method, system, device, and storage medium to solve or alleviate one or more of the above technical problems in the prior art.

[0007] According to one aspect of the present disclosure, a magnetic field safety detection method is provided, comprising:

[0008] Conduct magnetic detection through multiple Hall sensors and output multiple Hall sensor signals;

[0009] Multiple central processing units are provided, each of which obtains multiple Hall sensor signals;

[0010] Comparing the multiple Hall sensor signals obtained by multiple central processing units with the braking threshold;

[0011] When one or more signals among the multiple Hall sensor signals exceed the braking threshold, a braking signal is output.

[0012] In one possible implementation, the following steps are included:

[0013] Magnetic detection is performed through two Hall sensors, and two Hall sensor signals are output;

[0014] Two central processing units are set up, each central processing unit obtains two Hall sensor signals, and the two central processing units obtain four Hall sensor signals in total;

[0015] Compare the four Hall sensor signals with the braking threshold;

[0016] When one or more of the four Hall sensor signals exceeds the braking threshold, a braking signal is output.

[0017] In one possible implementation, the following steps are included:

[0018] If two Hall sensors are installed in opposite directions, the signal voltage value collected by the Hall sensor installed in the forward direction will increase, and the signal voltage value collected by the Hall sensor installed in the reverse direction will decrease.

[0019] Determine whether the changing directions of the Hall sensor signals output by two Hall sensors installed in opposite directions are consistent;

[0020] When the Hall sensor signals output by two Hall sensors installed in opposite directions change in the same direction, they are directed to the safe side.

[0021] In one possible implementation, the following steps are included:

[0022] A bias circuit is set up and connected to the power supply of the Hall sensor so that the voltage feedback value of the Hall sensor in the absence of a magnetic field is half of the power supply voltage;

[0023] Periodically check whether the current power supply voltage exceeds the normal power supply value range;

[0024] If the current power supply voltage exceeds the normal power supply value range, it will be directed to the safe side.

[0025] In one possible implementation, the following steps are included:

[0026] A self-test control circuit is provided, and a constant current source excitation is input to the coil around the Hall sensor through the self-test control circuit to generate a self-test magnetic field with a fixed field strength;

[0027] The signals of the self-measured magnetic field are respectively collected by two Hall sensors;

[0028] The self-test magnetic field signal is obtained through the central processing unit. Each central processing unit obtains two self-test magnetic field signals. The two central processing units obtain a total of four self-test magnetic field signals.

[0029] Compare the signals of the four self-test magnetic fields with the preset range;

[0030] When one of the four self-detected magnetic field signals is out of the preset range, it is directed to the safe side.

[0031] In one possible implementation, the following steps are included:

[0032] Two central processing units are used to determine whether the voltage collected by one of the Hall sensors is positively offset and the voltage collected by the other Hall sensor is negatively offset under the drive of the self-test magnetic field;

[0033] If one voltage is shifted in the positive direction and the other in the negative direction, it is directed to the safe side.

[0034] In one possible implementation, the following steps are included:

[0035] The braking threshold is based on half of the power supply voltage offset, and the braking threshold is adjusted through real-time calculation.

[0036] In one possible implementation, the following steps are included:

[0037] Real-time acquisition of the voltage value fed back by the Hall sensor when there is no magnetic field;

[0038] When the voltage value fed back by the Hall sensor is 0 in the absence of a magnetic field, a fault prompt message is issued to indicate that there is a disconnection fault in the intermediate circuit.

[0039] According to one aspect of the present disclosure, there is provided a magnetic field safety detection system, comprising:

[0040] Multiple Hall sensors, multiple central processing units and brake output circuits, each central processing unit includes an acquisition unit and a comparison unit;

[0041] Multiple Hall sensors are used for magnetic detection and output multiple Hall sensor signals;

[0042] An acquisition unit, used for respectively acquiring signals from multiple Hall sensors;

[0043] A comparison unit, used for comparing the acquired multi-channel Hall sensor signals with the braking threshold;

[0044] The braking output circuit is used to output a braking signal when one or more signals among the multiple Hall sensor signals exceed the braking threshold.

[0045] In a possible implementation, it includes: two Hall sensors and two central processing units;

[0046] Two Hall sensors are used for magnetic detection and output two Hall sensor signals;

[0047] The central processing units each include a Hall sensor signal acquisition unit for acquiring two Hall sensor signals. The Hall sensor signal acquisition units of the two central processing units acquire a total of four Hall sensor signals.

[0048] The central processing unit includes a Hall sensor signal comparison unit for comparing the four Hall sensor signals with the braking threshold.

[0049] In one possible implementation, the two Hall sensors are installed in opposite directions, the signal voltage value collected by the Hall sensor installed in the forward direction increases, and the signal voltage value collected by the Hall sensor installed in the reverse direction decreases;

[0050] Each CPU includes:

[0051] A judgment unit, used to judge whether the changing directions of the Hall sensor signals output by two Hall sensors installed in opposite directions are consistent;

[0052] The first control unit is used to guide the control system to the safety side when the Hall sensor signals output by two Hall sensors installed in opposite directions change in the same direction.

[0053] In one possible implementation, the following steps are included:

[0054] A bias circuit is connected to the power supply of the Hall sensor and is used to make the voltage feedback value of the Hall sensor half of the power supply voltage when there is no magnetic field;

[0055] A periodic detection unit is used to periodically detect whether the current power supply voltage exceeds the normal power supply value range;

[0056] The second control unit is used to guide the control system to a safe side when the current power supply voltage exceeds the normal power supply value range.

[0057] In one possible implementation, the following steps are included:

[0058] A self-test control circuit is used to input a constant current source excitation to the coil surrounding the Hall sensor to generate a self-test magnetic field with a fixed field strength;

[0059] Two Hall sensors, used to respectively collect signals of the self-measured magnetic field;

[0060] The central processing unit includes a self-test magnetic field signal acquisition unit for acquiring a self-test magnetic field signal. The self-test magnetic field signal acquisition unit of each central processing unit acquires two self-test magnetic field signals. The self-test magnetic field signal acquisition units of the two central processing units acquire a total of four self-test magnetic field signals.

[0061] The central processing unit includes a self-test magnetic field signal comparison unit for comparing the signals of the four self-test magnetic fields with a preset range;

[0062] The third control unit is configured to direct the control system to a safe side when one of the four self-detected magnetic field signals is outside a preset range.

[0063] In one possible implementation, the central processing unit includes an offset determination unit configured to determine whether, under the drive of the Hall sensors by the self-test magnetic field, a voltage acquired by one of the Hall sensors is positively offset and a voltage acquired by another Hall sensor is negatively offset;

[0064] The fourth control unit is used to guide the control system to the safety side in the case that one voltage deviates in a positive direction and the other voltage deviates in a negative direction.

[0065] In one possible implementation, the following steps are included:

[0066] The braking threshold is based on half of the power supply voltage offset, and the braking threshold is adjusted through real-time calculation.

[0067] In one possible implementation, the following steps are included:

[0068] The voltage acquisition unit is used to obtain the voltage value fed back by the Hall sensor in real time when there is no magnetic field;

[0069] The prompt unit is used to send a fault prompt message when the voltage value fed back by the Hall sensor is 0 when there is no magnetic field, so as to prompt that there is a disconnection fault in the intermediate circuit.

[0070] According to one aspect of the present disclosure, there is provided a magnetic field safety detection device, comprising:

[0071] processor and memory;

[0072] The memory is used to store a computer program, and the processor calls the computer program stored in the memory to execute any one of the above-mentioned magnetic field safety detection methods.

[0073] According to one aspect of the present disclosure, a computer-readable storage medium is provided, in which a computer program is stored. When the computer program is executed by a processor, the processor is enabled to perform any of the above-mentioned magnetic field safety detection methods.

[0074] The exemplary embodiments of the present disclosure have the following beneficial effects: the exemplary embodiments of the present disclosure have low implementation cost, high reliability, higher sensitivity, stronger adaptability, and comply with the "combined fault-safe architecture". The use of magnetic field safety detection based on the Hall effect can adapt to higher-speed train operation control systems. The magnetoelectric method has a faster response speed, and the dual-channel Hall sensors are symmetrically mutually checked, and the detection method using dual CPUs to take two is more reliable.

[0075] Details of one or more embodiments of the present application are set forth in the following drawings and description. Other features and advantages of the present application will become apparent from the accompanying drawings. It should be understood that the above general description and the detailed description that follows are merely exemplary and illustrative and do not limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0077] FIG1 is a schematic diagram of the working principle of a Hall sensor of this exemplary embodiment;

[0078] FIG2 is a flow chart of a magnetic field safety detection method of this exemplary embodiment;

[0079] FIG3 is a schematic diagram of the principle architecture of this exemplary embodiment;

[0080] FIG4 is a schematic diagram showing changes in two-way Hall sensor signals of this exemplary embodiment;

[0081] FIG5 is a schematic diagram showing the principle of a magnetic field safety detection method according to this exemplary embodiment;

[0082] FIG6 is a block diagram of a magnetic field safety detection system according to this exemplary embodiment;

[0083] FIG. 7 is a schematic structural diagram of a magnetic field safety detection device according to this exemplary embodiment. DETAILED DESCRIPTION

[0084] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present disclosure will be more comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or that other methods, components, devices, steps, etc. may be employed. In other cases, well-known technical solutions are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0085] In addition, the accompanying drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. Identical reference numerals in the figures denote identical or similar parts, and thus repetitive descriptions thereof will be omitted. Some of the blocks shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware units or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0086] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all steps. For example, some steps may be decomposed, while some steps may be combined or partially combined, so the actual execution order may change according to actual circumstances.

[0087] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the application described herein can, for example, be implemented in an order other than that illustrated or described herein.

[0088] In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or submodules is not necessarily limited to those steps or submodules explicitly listed, but may include other steps or submodules not explicitly listed or inherent to such process, method, product or apparatus.

[0089] In recent years, the rail transit industry has developed rapidly. In order to adapt to different economic forms around the world, there is an increasing demand for low-cost train control systems that are suitable for large passenger flows, multiple scenarios, and low costs. In addition, it is necessary to improve safety, reliability, sensitivity and cost-effectiveness while ensuring existing functions. Modern electronic technology should be used to improve the degree of automation of equipment, making it tend to be highly safe, highly reliable and highly intelligent, thereby improving the comprehensive market competitiveness of the train control system.

[0090] The main function of the magnetic parking system based on the Hall effect magnetic field safety detection method is to detect the ground stop signal through the Hall effect detection method and the control of the logic algorithm, so as to realize the protection of the train from running red lights, so that when the train runs across the stop signal, it can be restricted to a safe area for parking.

[0091] FIG1 is a schematic diagram of the principle of the Hall sensor of this exemplary embodiment. As shown in FIG1 , the working principle of the Hall sensor is described as follows:

[0092] Two independent Hall effect magnetic sensors are used to detect the magnetism of the ground magnet. The two sensors are compared using a 2-way method, and the combined fail-safe architecture is also adopted.

[0093] Two independent Hall circuits are used in each magnetic sensor to detect the magnetism of the ground magnet. The two Hall circuits are compared. As long as one detects a magnetic field strength that meets the characteristics, it is considered that there is a permanent magnet on the ground, and the emergency brake output is triggered;

[0094] Dynamic self-test technology is used to generate a controlled magnetic field inside the magnetic sensor to detect the working status and detection accuracy of the Hall circuit in real time, ensuring that the sensor can correctly detect the ground magnetic field;

[0095] Digital signal processing algorithms are used to calculate the magnetic field strength, filter out the interfering magnetic field on the rails, accurately calculate the detected magnetic field strength, and accurately determine the ground magnet information.

[0096] The dual CPU processing method is used to process the two independent Hall circuit collection information respectively, and the collection results are processed multiple times by taking two.

[0097] FIG2 is a flow chart of a magnetic field safety detection method of this exemplary embodiment. As shown in FIG2 , an exemplary embodiment of the present disclosure provides a magnetic field safety detection method, including:

[0098] S1 performs magnetic detection through multiple Hall sensors and outputs multiple Hall sensor signals;

[0099] S2 sets up multiple central processing units, each of which obtains multiple Hall sensor signals;

[0100] S3 compares the multi-channel Hall sensor signals obtained by multiple central processors with the braking threshold;

[0101] S4 outputs a braking signal when one or more signals among the multiple Hall sensor signals exceed the braking threshold.

[0102] It is worth noting that in this embodiment, the number of central processing units is consistent with the number of Hall sensors. Each central processing unit is connected to all Hall sensors and is used to receive Hall sensor signals output by all Hall sensors. Then, all Hall sensor signals received by all central processing units are compared with the braking threshold. As long as there is one signal among all Hall sensor signals that exceeds the braking threshold, a braking signal is output.

[0103] FIG3 is a schematic diagram of the principle architecture of this exemplary embodiment. As shown in FIG3 , this embodiment exemplarily includes:

[0104] Magnetic detection is performed through two Hall sensors, and two Hall sensor signals are output;

[0105] Two central processing units are set up, each central processing unit obtains two Hall sensor signals, and the two central processing units obtain four Hall sensor signals in total;

[0106] Compare the four Hall sensor signals with the braking threshold;

[0107] When one or more of the four Hall sensor signals exceeds the braking threshold, a braking signal is output.

[0108] In this embodiment, the dual CPUs monitor the feedback signals of the two Hall sensors in real time, and the four sets of results are compared in real time. The results are subjected to an "AND" operation. As long as one set of results is calculated as "running a red light", the brake output circuit is controlled to output a brake signal.

[0109] FIG4 is a schematic diagram of changes in signals of two Hall sensors of this exemplary embodiment. In FIG4 , Hall_reverse represents a Hall sensor installed in a reverse direction, Hall_forward represents a Hall sensor installed in a forward direction, the abscissa B (mT) represents the magnetic field induction intensity B, in millitesla mT, the ordinate V_out (V) represents the output voltage V_out, in volts V, V_Q represents half the power supply voltage, V_MAX represents the maximum output voltage, and V_MIN represents the minimum output voltage. As shown in FIG4 , this embodiment exemplarily includes:

[0110] If two Hall sensors are installed in opposite directions, the signal voltage value collected by the Hall sensor installed in the forward direction will increase, and the signal voltage value collected by the Hall sensor installed in the reverse direction will decrease.

[0111] Determine whether the changing directions of the Hall sensor signals output by two Hall sensors installed in opposite directions are consistent;

[0112] When the Hall sensor signals output by two Hall sensors installed in opposite directions change in the same direction, they are directed to the safe side.

[0113] In this embodiment, the two Hall sensors are installed in opposite directions. When detecting the magnetic field, they change in two directions respectively. The signal voltage value collected by the forward Hall increases, and the signal voltage value collected by the reverse Hall decreases. When it is found that the two Halls exceed the threshold or the change directions are inconsistent, they will also be directed to the safe side.

[0114] Exemplarily, it includes:

[0115] A bias circuit is set up and connected to the power supply of the Hall sensor so that the voltage feedback value of the Hall sensor in the absence of a magnetic field is half of the power supply voltage;

[0116] Periodically check whether the current power supply voltage exceeds the normal power supply value range;

[0117] If the current power supply voltage exceeds the normal power supply value range, it will be directed to the safe side.

[0118] In this embodiment, the bias circuit design ensures that the voltage feedback from the two Hall sensors is not zero when there is no magnetic field, but rather half the power supply voltage. The system also periodically monitors the deviation between the power supply voltage and the normal value, and redirects the voltage to a safe level if the deviation is too large.

[0119] Exemplarily, it includes:

[0120] A self-test control circuit is provided, and a constant current source excitation is input to the coil around the Hall sensor through the self-test control circuit to generate a self-test magnetic field with a fixed field strength;

[0121] The signals of the self-measured magnetic field are respectively collected by two Hall sensors;

[0122] The self-test magnetic field signal is obtained through the central processing unit. Each central processing unit obtains two self-test magnetic field signals. The two central processing units obtain a total of four self-test magnetic field signals.

[0123] Compare the signals of the four self-test magnetic fields with the preset range;

[0124] When one of the four self-detected magnetic field signals is out of the preset range, it is directed to the safe side.

[0125] Exemplarily, it includes:

[0126] Two central processing units are used to determine whether the voltage collected by one of the Hall sensors is positively offset and the voltage collected by the other Hall sensor is negatively offset under the drive of the self-test magnetic field;

[0127] If one voltage is shifted in the positive direction and the other in the negative direction, it is directed to the safe side.

[0128] In this embodiment, the Hall sensor will perform periodic self-tests, and the CPU (central processing unit) will input a constant current source excitation to the coil around the Hall sensor through the self-test control circuit. Through the principle of point magnetism, an electromagnetic field is generated, and the Hall sensor collects the signal of the self-test magnetic field. For the constant current magnetic field, a magnetic field with a fixed field strength will be generated, so that the voltage value collected by the Hall sensor is a relatively stable value. The dual CPUs will respectively detect whether the voltage signals fed back by the two Hall sensors are within the preset range. If they exceed the threshold, they will be directed to the safe side; at the same time, the dual CPUs will respectively detect whether one voltage of the two Hall sensors is positively offset and the other voltage is negatively offset under the drive of the self-test magnetic field. If the offset direction is wrong, it will also be directed to the safe side, thereby ensuring the device integrity of the Hall sensor through real-time monitoring to ensure that the ground signal will not be detected due to device damage when detecting the ground signal.

[0129] Exemplarily, it includes:

[0130] The braking threshold is based on half of the power supply voltage offset, and the braking threshold is adjusted through real-time calculation.

[0131] In this embodiment, when the dual CPUs perform brake threshold monitoring, half of the power supply voltage bias is used as the benchmark. The benchmark value is calculated and adjusted in real time, and the threshold is judged based on the dynamic value. Because the inherent characteristics of the hardware will attenuate as its service life increases and it is affected by the external environment, the use of dynamic benchmark value judgment method can more effectively improve availability, reliability and sensitivity.

[0132] Exemplarily, it includes:

[0133] Real-time acquisition of the voltage value fed back by the Hall sensor when there is no magnetic field;

[0134] When the voltage value fed back by the Hall sensor is 0 in the absence of a magnetic field, a fault prompt message is issued to indicate that there is a disconnection fault in the intermediate circuit.

[0135] In this embodiment, when there is no magnetic field, the dual CPUs judge the Hall sensor feedback signal in real time. By designing the bias circuit so that when there is no ground magnetic field signal, the acquisition result is half of the power supply voltage bias to determine whether the line is broken. When there is a disconnection fault in the intermediate circuit, the acquisition results of the dual CPUs will both be 0.

[0136] FIG5 is a schematic diagram showing the principle of a magnetic field safety detection method according to this exemplary embodiment. As shown in FIG5 , this embodiment includes the following steps:

[0137] The signal collected from the first Hall sensor HALL_1 is recorded as X1, and the signal collected from the second Hall sensor HALL_2 is recorded as X2;

[0138] Take the average value Y of the two Hall sensor signals to determine whether the magnetic field is safe. The calculation formula of the average value Y is: Y = (X1 + X2) / 2;

[0139] Periodically self-check whether the average value Y of the two Hall sensor signals exceeds the set tolerance range. For example, compare the difference between the average value Y of the two Hall sensor signals and half of the full power supply voltage with the tolerance range, that is, determine whether |Y-full power supply voltage / 2| is greater than or equal to the tolerance range;

[0140] When |Y-full power supply voltage / 2| is greater than or equal to the tolerance range, it is determined whether the current number of self-tests exceeds the tolerance number (the tolerance number refers to the total number of periodic self-tests preset in this embodiment);

[0141] If the current number of self-tests exceeds the tolerance number, the system will shut down. If the current number of self-tests does not exceed the tolerance number, the system will continue to perform self-tests.

[0142] When |Y - full power supply voltage / 2| is less than the tolerance range, it is determined whether the signal of the first Hall sensor HALL_1 or the signal of the second Hall sensor HALL_2 exceeds the braking threshold, that is, whether |X1 - Y| is greater than or equal to the Y-braking threshold, or whether |X2 - Y| is greater than or equal to the Y-braking threshold;

[0143] When |X1-Y| is greater than or equal to the Y-brake threshold, or |X2-Y| is greater than or equal to the Y-brake threshold, the digital filtering result is output and the brake is applied;

[0144] Otherwise, continue to obtain the two Hall sensor signals to determine whether the magnetic field is safe.

[0145] In summary, this embodiment uses the method of not being 0 when there is no magnetic field to check for broken wires. The dual Hall sensors detect the ground magnetic field by linearly changing in two opposite directions to improve the reliability and accuracy of the detection. The method of using Hall sensors to detect the magnetic field and output a parking signal. The dual CPUs use a binary operation to compare the magnetic field acquisition structure to detect the magnetic field signal. The method of dynamically revising the magnetic field bias reference value is used to achieve high reliability, availability and high adaptability of the equipment. The integrity of the Hall sensor is judged by periodic magnetoelectricity to ensure the quality of the device itself.

[0146] FIG6 is a block diagram of a magnetic field safety detection system according to an exemplary embodiment of the present disclosure. As shown in FIG6 , an exemplary embodiment of the present disclosure provides a magnetic field safety detection system, including:

[0147] Multiple Hall sensors 10, multiple central processing units 20 and a brake output circuit 30, each central processing unit including an acquisition unit 21 and a comparison unit 22;

[0148] Multiple Hall effect sensors 10, used for magnetic detection and outputting multiple Hall effect sensor signals;

[0149] An acquisition unit 21 is used to respectively acquire signals from multiple Hall sensors;

[0150] A comparison unit 22 is used to compare the acquired multi-channel Hall sensor signals with the braking threshold;

[0151] The braking output circuit 30 is used to output a braking signal when one or more signals among the multiple Hall sensor signals exceed the braking threshold.

[0152] Exemplarily, it includes: two Hall sensors and two central processing units;

[0153] Two Hall sensors are used for magnetic detection and output two Hall sensor signals;

[0154] The central processing units each include a Hall sensor signal acquisition unit for acquiring two Hall sensor signals. The Hall sensor signal acquisition units of the two central processing units acquire a total of four Hall sensor signals.

[0155] The central processing unit includes a Hall sensor signal comparison unit for comparing the four Hall sensor signals with the braking threshold.

[0156] For example, the two Hall sensors are installed in opposite directions, the signal voltage value collected by the Hall sensor installed in the forward direction increases, and the signal voltage value collected by the Hall sensor installed in the reverse direction decreases;

[0157] Each CPU includes:

[0158] A judgment unit, used to judge whether the changing directions of the Hall sensor signals output by two Hall sensors installed in opposite directions are consistent;

[0159] The first control unit is used to guide the control system to the safe side when the Hall sensor signals output by two Hall sensors installed in opposite directions change in the same direction. For example, the first control unit is used to control the train operation control system to the safe side, that is, to output a braking signal.

[0160] Exemplarily, it includes:

[0161] A bias circuit is connected to the power supply of the Hall sensor and is used to make the voltage feedback value of the Hall sensor half of the power supply voltage when there is no magnetic field;

[0162] A periodic detection unit is used to periodically detect whether the current power supply voltage exceeds the normal power supply value range;

[0163] The second control unit is used to guide the control system to a safe side when the current power supply voltage exceeds the normal power supply value range.

[0164] Exemplarily, it includes:

[0165] A self-test control circuit is used to input a constant current source excitation to the coil surrounding the Hall sensor to generate a self-test magnetic field with a fixed field strength;

[0166] Two Hall sensors, used to respectively collect signals of the self-measured magnetic field;

[0167] The central processing unit includes a self-test magnetic field signal acquisition unit for acquiring a self-test magnetic field signal. The self-test magnetic field signal acquisition unit of each central processing unit acquires two self-test magnetic field signals. The self-test magnetic field signal acquisition units of the two central processing units acquire a total of four self-test magnetic field signals.

[0168] The central processing unit includes a self-test magnetic field signal comparison unit for comparing the signals of the four self-test magnetic fields with a preset range;

[0169] The third control unit is configured to direct the control system to a safe side when one of the four self-detected magnetic field signals is outside a preset range.

[0170] Exemplarily, the central processing unit includes an offset determination unit for determining whether, under the drive of the self-test magnetic field, a voltage collected by one of the Hall sensors is positively offset and a voltage collected by another Hall sensor is negatively offset;

[0171] The fourth control unit is used to guide the control system to the safety side in the case that one voltage deviates in a positive direction and the other voltage deviates in a negative direction.

[0172] Exemplarily, it includes:

[0173] The braking threshold is based on half of the power supply voltage offset, and the braking threshold is adjusted through real-time calculation.

[0174] Exemplarily, it includes:

[0175] The voltage acquisition unit is used to obtain the voltage value fed back by the Hall sensor in real time when there is no magnetic field;

[0176] The prompt unit is used to send a fault prompt message when the voltage value fed back by the Hall sensor is 0 when there is no magnetic field, so as to prompt that there is a disconnection fault in the intermediate circuit.

[0177] In summary, this embodiment has low implementation cost, high reliability, higher sensitivity, stronger adaptability, and complies with the "combined fault-safe architecture". Since relay detection is through energy accumulation, the reaction speed is relatively slow. The use of magnetic field safety detection based on the Hall effect can adapt to higher-speed train operation control systems. The magnetoelectric method has a faster reaction speed, and this type of dual-channel Hall sensor symmetrically checks each other, and the detection method using dual CPUs is more reliable.

[0178] FIG7 is a schematic structural diagram of a magnetic field safety detection device of this exemplary embodiment. As shown in FIG7 , corresponding to the magnetic field safety detection method provided above, the present invention also provides a magnetic field safety detection device. Since the embodiment of the device is similar to the above method embodiment, the description is relatively simple. For relevant details, please refer to the description of the above method embodiment. The device described below is only schematic. The device may include: a processor 1, a memory 2, a communication bus (i.e., the above device bus) and a search engine, wherein the processor 1 and the memory 2 communicate with each other through the communication bus and communicate with the outside through the communication interface. The processor 1 can call the logic instructions in the memory 2 to execute the magnetic field safety detection method.

[0179] In addition, the logic instructions in the above-mentioned memory 2 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present invention. The aforementioned storage medium includes: a memory chip, a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0180] On the other hand, an embodiment of the present invention further provides a processor-readable storage medium, on which a computer program 3 is stored. When the computer program 3 is executed by the processor 1, the magnetic field safety detection method provided in the above embodiments is implemented.

[0181] The processor-readable storage medium can be any available medium or data storage device that can be accessed by the processor 1, including but not limited to magnetic storage (such as floppy disks, hard disks, tapes, magneto-optical disks (MO)), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROMs, EPROMs, EEPROMs, non-volatile memories (NANDFLASH), solid-state drives (SSDs)), etc.

[0182] The above are merely preferred embodiments of the present disclosure. The scope of protection of the present disclosure is not limited to the above embodiments. All technical solutions based on the principles of the present disclosure are within the scope of protection of the present disclosure. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present disclosure should be considered within the scope of protection of the present disclosure.

Claims

1. A magnetic field safety detection method, It is characterized in that include: Conduct magnetic detection through multiple Hall sensors and output multiple Hall sensor signals; Multiple central processing units are provided, and each central processing unit obtains multiple Hall sensor signals; Comparing the multiple Hall sensor signals obtained by the multiple central processors with the braking threshold; When one or more signals among the multiple Hall sensor signals exceed the braking threshold, a braking signal is output.

2. The magnetic field safety detection method according to claim 1, It is characterized in that include: Magnetic detection is performed through two Hall sensors, and two Hall sensor signals are output; Two central processors are provided, each central processor obtains two Hall sensor signals, and the two central processors obtain four Hall sensor signals in total; Compare the four Hall sensor signals with the braking threshold; When one or more of the four Hall sensor signals exceed the braking threshold, a braking signal is output.

3. The magnetic field safety detection method according to claim 2, It is characterized in that include: If two Hall sensors are installed in opposite directions, the signal voltage value collected by the Hall sensor installed in the forward direction will increase, and the signal voltage value collected by the Hall sensor installed in the reverse direction will decrease. Determine whether the changing directions of the Hall sensor signals output by two Hall sensors installed in opposite directions are consistent; When the Hall sensor signals output by two Hall sensors installed in opposite directions change in the same direction, they are directed to the safe side.

4. The magnetic field safety detection method according to claim 2, It is characterized in that include: A bias circuit is provided, and the bias circuit is connected to the power supply of the Hall sensor so that the voltage value fed back by the Hall sensor when there is no magnetic field is half of the power supply voltage; Periodically check whether the current power supply voltage exceeds the normal power supply value range; If the current power supply voltage exceeds the normal power supply value range, it will be directed to the safety side.

5. The magnetic field safety detection method according to claim 2, It is characterized in that include: A self-test control circuit is provided, and a constant current source excitation is input to the coil around the Hall sensor through the self-test control circuit to generate a self-test magnetic field with a fixed field strength; The signals of the self-measured magnetic field are respectively collected by two Hall sensors; The self-test magnetic field signal is obtained through the central processor, each central processor obtains two self-test magnetic field signals, and the two central processors obtain four self-test magnetic field signals in total; Compare the signals of the four self-test magnetic fields with the preset range; When one of the four self-detected magnetic field signals is out of the preset range, it is directed to the safe side.

6. The magnetic field safety detection method according to claim 5, It is characterized in that include: Two central processors are used to determine whether the voltage collected by one of the Hall sensors is positively offset and the voltage collected by the other Hall sensor is negatively offset under the driving of the self-test magnetic field. If one voltage is shifted in the positive direction and the other in the negative direction, it is directed to the safe side.

7. The magnetic field safety detection method according to claim 4, It is characterized in that include: The braking threshold is based on half of the power supply voltage offset, and the braking threshold is adjusted through real-time calculation.

8. The magnetic field safety detection method according to claim 4, It is characterized in that include: Real-time acquisition of the voltage value fed back by the Hall sensor when there is no magnetic field; When the voltage value fed back by the Hall sensor is 0 in the absence of a magnetic field, a fault prompt message is issued to indicate that there is a disconnection fault in the intermediate circuit.

9. A magnetic field safety detection system, It is characterized in that include: Multiple Hall sensors, multiple central processors and brake output circuits, each central processor including an acquisition unit and a comparison unit; Multiple Hall sensors are used for magnetic detection and output multiple Hall sensor signals; An acquisition unit, used for respectively acquiring signals of multiple Hall sensors; A comparison unit, used for comparing the acquired multi-channel Hall sensor signals with the braking threshold; The braking output circuit is used to output a braking signal when one or more signals among the multiple Hall sensor signals exceed the braking threshold.

10. The magnetic field safety detection system according to claim 9, It is characterized in that include: Two Hall sensors and two CPUs; Two Hall sensors are used for magnetic detection and output two Hall sensor signals; The central processing units each include a Hall sensor signal acquisition unit for acquiring two Hall sensor signals. The Hall sensor signal acquisition units of the two central processing units acquire four Hall sensor signals in total. The central processing unit includes a Hall sensor signal comparison unit for comparing the four Hall sensor signals with the braking threshold.

11. The magnetic field safety detection system according to claim 10, It is characterized in that The two Hall sensors are installed in opposite directions. The signal voltage value collected by the Hall sensor installed in the forward direction increases, while the signal voltage value collected by the Hall sensor installed in the reverse direction decreases. Each CPU includes: A judging unit, used to judge whether the changing directions of the Hall sensor signals output by two Hall sensors installed in opposite directions are consistent; The first control unit is used to guide the control system to the safety side when the Hall sensor signals output by two Hall sensors installed in opposite directions change in the same direction.

12. The magnetic field safety detection system according to claim 10, It is characterized in that include: A bias circuit is connected to the power supply of the Hall sensor and is used to make the voltage value fed back by the Hall sensor be half of the power supply voltage when there is no magnetic field; A periodic detection unit, used to periodically detect whether the current power supply voltage exceeds the normal power supply value range; The second control unit is used to guide the control system to the safety side when the current power supply voltage exceeds the normal power supply value range.

13. The magnetic field safety detection system according to claim 10, It is characterized in that include: A self-test control circuit is used to input a constant current source excitation to the coil around the Hall sensor to generate a self-test magnetic field with a fixed field strength; Two Hall sensors, used to respectively collect signals of the self-measured magnetic field; The central processing unit includes a self-test magnetic field signal acquisition unit, which is used to acquire the signal of the self-test magnetic field. The self-test magnetic field signal acquisition unit of each central processing unit acquires two self-test magnetic field signals. The self-test magnetic field signal acquisition units of the two central processing units acquire four self-test magnetic field signals in total. The central processing unit includes a self-test magnetic field signal comparison unit for comparing the signals of the four self-test magnetic fields with a preset range; The third control unit is used to guide the control system to a safe side when one of the four self-detected magnetic field signals is out of a preset range.

14. The magnetic field safety detection system according to claim 13, Features: The central processing unit includes an offset judgment unit for judging whether the voltage collected by one of the Hall sensors is positively offset and the voltage collected by the other Hall sensor is negatively offset under the driving of the self-test magnetic field; The fourth control unit is used to guide the control system to the safety side if one voltage deviates in a positive direction and the other voltage deviates in a negative direction.

15. The magnetic field safety detection system according to claim 12, It is characterized in that include: The braking threshold is based on half of the power supply voltage offset, and the braking threshold is adjusted through real-time calculation.

16. The magnetic field safety detection system according to claim 12, It is characterized in that include: A voltage acquisition unit is used to obtain in real time the voltage value fed back by the Hall sensor when there is no magnetic field; The prompt unit is used to send out a fault prompt message when the voltage value fed back by the Hall sensor is 0 when there is no magnetic field, so as to prompt that there is a disconnection fault in the intermediate circuit.

17. A magnetic field safety detection device, It is characterized in that include: Processor and memory; The memory is used to store a computer program, and the processor calls the computer program stored in the memory to execute the magnetic field safety detection method according to any one of claims 1 to 8.

18. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor is enabled to execute the magnetic field safety detection method according to any one of claims 1 to 8.

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