A train speed measurement and control system

Abstract

This utility model discloses a train speed measurement and control system, including two magnetoelectric sensors, a speed measurement module, and a display module. The two magnetoelectric sensors are positioned inside the train's entry track and spaced apart. The speed measurement module includes a microcontroller, a power conversion circuit, two signal conversion circuits, an RS485 interface circuit, and a relay control circuit. The power conversion circuit provides power. The two magnetoelectric sensors are connected to the input terminals of the two signal conversion circuits, respectively. The output terminals of the two signal conversion circuits, the input terminal of the RS485 interface circuit, and the input terminal of the relay control circuit are connected to the pins of the microcontroller, respectively. The display module is connected to the output terminal of the RS485 interface circuit, and the output terminal of the relay control circuit is connected to an external alarm module. This utility model detects the train speed using two magnetoelectric sensors and determines whether the train is entering or passing through the station based on the speed, thereby achieving rapid on-site alarm notification.

Description

Technical Field

[0001] This utility model relates to the field of train speed measurement technology, specifically a train speed measurement and control system. Background Technology

[0002] The train approach track is the track set up at the station entrance. Trains, according to their travel plans, either pass through the station or enter it. Whether a train is approaching the station while in motion is remotely monitored and alerted via real-time train location data. However, this monitoring method cannot provide on-site alarm alerts; that is, it cannot provide real-time on-site alarm alerts when a train enters or passes through the station. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a train speed measurement and control system, which installs two magnetoelectric sensors at the train's entry point into the station track. The train speed is detected by the two magnetoelectric sensors, and the speed is used to determine whether the train is entering or passing through the station, thereby realizing rapid on-site alarm reminders.

[0004] The technical solution of this utility model is as follows:

[0005] A train speed measurement and control system includes two magnetoelectric sensors, a speed measurement module, and a display module. The two magnetoelectric sensors are positioned inside the train's entry track and spaced apart along the train's direction of travel. The speed measurement module includes a microcontroller, a power conversion circuit, two signal conversion circuits, an RS485 interface circuit, and a relay control circuit. The two magnetoelectric sensors are connected to the input terminals of the two signal conversion circuits respectively. The output terminals of the two signal conversion circuits, the input terminals of the RS485 interface circuit, and the input terminals of the relay control circuit are connected to the pins of the microcontroller respectively. The input terminal of the power conversion circuit is connected to a power supply. The power input terminals of the microcontroller, the RS485 interface circuit, and the relay control circuit are connected to the corresponding power output terminals of the power conversion circuit respectively. The display module is connected to the output terminal of the RS485 interface circuit, and the output terminal of the relay control circuit is connected to an external alarm module.

[0006] The microcontroller used is an STM32 microcontroller. An adjustable resistor is connected to the analog-to-digital converter (ADC) pin of the STM32 microcontroller. The ADC pin of the STM32 microcontroller, one fixed terminal and one adjustable terminal of the adjustable resistor are all connected to one end of the fixed resistor. The other end of the fixed resistor is connected to the power supply, and the other fixed terminal of the adjustable resistor is grounded.

[0007] Both signal conversion circuits are voltage conversion circuits. Each voltage conversion circuit includes resistors R1, R2, and R3, diode D1, and capacitor C1. One end of each resistor R1 and R2 is connected to the output terminal of the magnetoelectric sensor. The other end of resistor R1 and the positive terminal of diode D1 are grounded. The negative terminal of diode D2 and one end of resistor R3 are connected to the other end of resistor R2. One end of capacitor C1 is grounded. The other ends of resistor R3 and capacitor C1 are connected to the corresponding signal acquisition pins of the microcontroller.

[0008] The relay control circuit includes an NPN transistor V1 and a relay JD1. The base of the NPN transistor V1 is connected to the relay control pin of the microcontroller. The emitter of the NPN transistor V1 is grounded. The collector of the NPN transistor V1 is connected to the power supply through the coil of the relay JD1. One end of the normally open contact of the relay JD1 is grounded, and the other end of the normally open contact of the relay JD1 is connected to the input terminal of the alarm module. The other end of the normally open contact of the relay JD1 is connected to the power supply through a resistor.

[0009] The speed measurement module also includes a digital tube, which is connected to the corresponding digital output pin of the microcontroller.

[0010] Advantages of this utility model:

[0011] This invention features two magnetoelectric sensors spaced a distance apart on the inner side of the train's entry track. Since the train wheels are made of metal, the magnetic field around the sensors changes when the wheels pass them, causing the sensors to detect the train signal. By detecting the time difference between the wheels passing the two sensors and the distance between them, the real-time speed of the train is calculated. When the speed exceeds the alarm speed threshold, the train is determined to pass the station without stopping, and the alarm module is activated to issue an alert. When the speed is below the alarm speed threshold, the train is determined to slow down and stop at the station, and no alarm is issued.

[0012] The speed measurement module and display module of this utility model are both integrated modular structures, and are connected by RS485 cable communication. The on-site connection and installation are simple. The sensor spacing and alarm speed threshold are set by adjustable resistors, making installation and control simple. It can monitor and display the train speed in real time and realize the corresponding on-site alarm reminders. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the principle of this utility model.

[0014] Figure 2 This is the circuit diagram of the microcontroller of this utility model.

[0015] Figure 3This is a circuit diagram of the signal conversion circuit of this utility model.

[0016] Figure 4 This is the circuit diagram of the relay control circuit of this utility model.

[0017] Reference numerals: 1-Magnetic-electric sensor, 2-Speed ​​measurement module, 3-Display module, 4-Alarm module, 21-STM32 microcontroller, 22-Power conversion circuit, 23-Signal conversion circuit, 24-RS485 interface circuit, 25-Relay control circuit, 26-Digital tube. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] See Figure 1 A train speed measurement and control system includes two magnetoelectric sensors 1, a speed measurement module 2, and a display module 3. The two magnetoelectric sensors 1 are located inside the train's entry track and spaced a distance (1.5~5.5 meters) apart along the train's direction of travel. The speed measurement module 2 includes an STM32 microcontroller 21, a power conversion circuit 22, two signal conversion circuits 23, an RS485 interface circuit 24, a relay control circuit 25, and a digital display 26. The two magnetoelectric sensors 1 are connected one-to-one to the input terminals of the two signal conversion circuits 23, and the output terminals of the two signal conversion circuits 23, the input terminal of the RS485 interface circuit 24, and the output terminal of the relay control circuit 25 are also connected. The input terminals of the digital tube 26 and the input terminals of the digital tube 26 are respectively connected to the pins of the STM32 microcontroller 21. The input terminal of the power conversion circuit 22 is connected to the power supply VINMAIN. The power input terminal of the STM32 microcontroller 21 is connected to the power output terminal VCC of the power conversion circuit 22. The power input terminal of the RS485 interface circuit 24 is connected to the power output terminal VCC of the power conversion circuit 22. The power input terminal of the relay JD1 coil of the relay control circuit 25 is connected to the power output terminal VDD of the power conversion circuit 22. The display module 3 is connected to the output terminal of the RS485 interface circuit 24. The output terminal of the relay control circuit 25 is connected to the external alarm module 4.

[0020] See Figure 2An adjustable resistor R51 is connected to the analog-to-digital converter (ADC) pin of the STM32 microcontroller 21 (U2). The ADC pin of the STM32 microcontroller U2, one fixed terminal and one adjustable terminal of the adjustable resistor R51 are both connected to one end of a fixed resistor R52. The other end of the fixed resistor R52 is connected to the power supply VCC, and the other fixed terminal of the adjustable resistor R51 is grounded.

[0021] See Figure 3 Both signal conversion circuits 23 are voltage conversion circuits. The voltage conversion circuit includes resistors R1, R2, and R3, diode D1, and capacitor C1. One end of resistors R1 and R2 is connected to the output terminal SA or SB of the magnetoelectric sensor. The other end of resistor R1 and the positive terminal of diode D1 are grounded. The negative terminal of diode D2 and one end of resistor R3 are connected to the other end of resistor R2. One end of capacitor C1 is grounded. The other ends of resistor R3 and capacitor C1 are connected to the corresponding signal acquisition pins SINA or SINB of microcontroller U2.

[0022] See Figure 4 The relay control circuit 25 includes an NPN transistor V1 and a relay JD1. The base of the NPN transistor V1 is connected to the relay control pin SOUT of the microcontroller U2. The emitter of the NPN transistor V1 is grounded. The collector of the NPN transistor V1 is connected to the power supply VDD through the coil of the relay JD1. One end of the normally open contact of the relay JD1 is grounded. The other end of the normally open contact of the relay JD1 is connected to the input terminal J-OUT of the alarm module. The other end of the normally open contact of the relay JD1 is connected to the power supply VINMAIN through a resistor.

[0023] The working process of this utility model is as follows:

[0024] (1) Within 0 to 15 seconds of power-on, the distance between the two magnetoelectric sensors 1 is set to [1.50, 5.50] m by adjusting resistor R51;

[0025] (2) Within 15 to 30 seconds of power-on, set the alarm speed threshold to [2, 180] km / h through the adjustable resistor R51; when the alarm speed threshold is set to 0, the alarm function is turned off.

[0026] (3) After power-on, if the resistance value of the adjustable resistor R51 does not change within 0 to 15 seconds, the previously set spacing value will be maintained; if the resistance value of the adjustable resistor R51 does not change within 15 to 30 seconds, the previously set alarm speed threshold will be maintained.

[0027] (4) After 30 seconds of power-on, the speed measurement module enters the standby state and waits for the signal from the magnetoelectric sensor 1. The speed measurement range is 2~180km / h. If the speed exceeds this range, it is considered an invalid value and no response is made. The speed measurement timeout is 10 seconds.

[0028] (5) After a speed measurement is completed, the digital tube 26 displays the vehicle speed instantly. When the real-time vehicle speed obtained from the speed measurement is greater than the alarm speed threshold, the microcontroller 21 sends a high level to the base of the NPN transistor V1 in the relay control circuit. The NPN transistor V1 is turned on, the normally open contact of the relay JD1 is closed and turned on, and an alarm signal is sent to the alarm module. The alarm module provides an audible and visual alarm to remind the train that it is about to pass through the station quickly. After each speed measurement is completed, the RS485 interface circuit 24 outputs one vehicle speed data to the display module 3. The display module 3 only displays the vehicle speed data.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A train speed measurement and control system, characterized in that: The system includes two magnetoelectric sensors, a speed measurement module, and a display module. The two magnetoelectric sensors are positioned inside the train's entry track and spaced a distance apart along the train's direction of travel. The speed measurement module includes a microcontroller, a power conversion circuit, two signal conversion circuits, an RS485 interface circuit, and a relay control circuit. The two magnetoelectric sensors are connected to the input terminals of the two signal conversion circuits, respectively. The output terminals of the two signal conversion circuits, the input terminals of the RS485 interface circuit, and the input terminals of the relay control circuit are connected to the pins of the microcontroller. The input terminal of the power conversion circuit is connected to the power supply. The power input terminals of the microcontroller, the RS485 interface circuit, and the relay control circuit are connected to the corresponding power output terminals of the power conversion circuit. The display module is connected to the output terminal of the RS485 interface circuit, and the output terminal of the relay control circuit is connected to an external alarm module.

2. The train speed measurement and control system according to claim 1, characterized in that: The microcontroller used is an STM32 microcontroller. An adjustable resistor is connected to the analog-to-digital converter (ADC) pin of the STM32 microcontroller. The ADC pin of the STM32 microcontroller, one fixed terminal and one adjustable terminal of the adjustable resistor are all connected to one end of the fixed resistor. The other end of the fixed resistor is connected to the power supply, and the other fixed terminal of the adjustable resistor is grounded.

3. The train speed measurement and control system according to claim 1, characterized in that: Both signal conversion circuits are voltage conversion circuits. Each voltage conversion circuit includes resistors R1, R2, and R3, diode D1, and capacitor C1. One end of resistors R1 and R2 is connected to the output terminal of the magnetoelectric sensor, and the other end of resistor R1 and the positive terminal of diode D1 are grounded. The negative terminal of diode D2 and one end of resistor R3 are connected to the other end of resistor R2. One end of capacitor C1 is grounded, and the other ends of resistor R3 and capacitor C1 are connected to the corresponding signal acquisition pins of the microcontroller.

4. The train speed measurement and control system according to claim 1, characterized in that: The relay control circuit includes an NPN transistor V1 and a relay JD1. The base of the NPN transistor V1 is connected to the relay control pin of the microcontroller. The emitter of the NPN transistor V1 is grounded. The collector of the NPN transistor V1 is connected to the power supply through the coil of the relay JD1. One end of the normally open contact of the relay JD1 is grounded, and the other end of the normally open contact of the relay JD1 is connected to the input terminal of the alarm module. The other end of the normally open contact of the relay JD1 is connected to the power supply through a resistor.

5. A train speed measurement and control system according to claim 1, characterized in that: The speed measurement module also includes a digital tube, which is connected to the corresponding digital output pin of the microcontroller.

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