CN215436447U - Track section occupation detection system - Google Patents
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- CN215436447U CN215436447U CN202121948655.3U CN202121948655U CN215436447U CN 215436447 U CN215436447 U CN 215436447U CN 202121948655 U CN202121948655 U CN 202121948655U CN 215436447 U CN215436447 U CN 215436447U
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Abstract
The utility model belongs to the technical field of track detection, and particularly relates to a track section occupation detection system which comprises vehicle-mounted equipment and ground equipment; the vehicle-mounted equipment comprises a vehicle-mounted host unit and a vehicle-mounted antenna unit; the vehicle-mounted main unit is arranged in a carriage, and the vehicle-mounted antenna unit is arranged at the lower part of a vehicle body; the ground equipment comprises a ground signal receiving unit and a ground signal processing unit; the ground signal receiving unit is arranged in the middle of a track line in a redundant mode, and the ground signal processing unit is arranged in a trackside cabinet; when the ground signal receiving unit detects that the tramcar passes through, the ground signal processing unit outputs 24V switching value to the turnout control center, and the 24V switching value outputs low level to indicate that the tramcar passes through. The utility model can ensure the driving safety and effectively avoid the life and property loss caused by the rail train collision rear-end accident.
Description
Technical Field
The utility model belongs to the technical field of track detection, and particularly relates to a track section occupation detection system.
Background
In a railway signal system, real-time detection of the occupation condition of a train on a track of a certain section is very important, and is directly related to safe operation of driving and dispatching. The detection of the occupied state of the train track is the information guarantee of train intersection, line crossing, shunting operation and the like in a station, and provides a technical basis for avoiding safety accidents such as train collision, rear-end collision and the like. In order to realize the modernization of railway operation management and control, ensure the train operation safety and improve the transportation efficiency, an automatic track occupation detection system is urgently needed.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides a track section occupation detection system which is novel in design and convenient to operate, and a turnout control center can acquire the occupation state of a track section in real time, so that reliable data support is provided for controlling train operation and scheduling, and the operation safety is ensured.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model provides a track section occupation detection system, which comprises vehicle-mounted equipment and ground equipment;
the vehicle-mounted equipment comprises a vehicle-mounted host unit and a vehicle-mounted antenna unit; the vehicle-mounted main unit is arranged in a carriage, and the vehicle-mounted antenna unit is arranged at the lower part of a vehicle body; the vehicle-mounted host unit communicates with the vehicle-mounted computer to acquire the number information and send the number information to the ground equipment, and meanwhile, the station name information sent by the ground equipment is sent to the vehicle-mounted computer;
the ground equipment comprises a ground signal receiving unit and a ground signal processing unit; the ground signal receiving unit is arranged in the middle of a track line in a redundant mode, and the ground signal processing unit is arranged in a trackside cabinet; the ground signal receiving unit receives the train number information sent by the vehicle-mounted equipment and sends the train station name information to the vehicle-mounted equipment; when the ground signal receiving unit detects that the tramcar passes through, the ground signal processing unit outputs 24V switching value to the turnout control center, and the 24V switching value outputs low level to indicate that the tramcar passes through.
Further, the vehicle-mounted host unit is connected with the vehicle-mounted antenna unit through a coaxial line, the vehicle-mounted host unit is in data communication with a vehicle-mounted computer through RS422, and the vehicle-mounted host unit obtains a DC24V power supply from a vehicle power supply.
Further, the on-vehicle host unit includes an on-vehicle signal processing circuit and an on-vehicle power supply circuit; the vehicle-mounted power supply circuit provides a DC15V working power supply for the vehicle-mounted signal processing circuit; the vehicle-mounted signal processing circuit is communicated with the ground signal receiving unit through the connected vehicle-mounted antenna unit, the vehicle-mounted 27MHz signal is sent to the ground signal receiving unit, meanwhile, the 4.2MHz signal sent by the ground signal receiving unit is received and decoded, and the decoded signal is sent to the vehicle-mounted computer.
Further, the vehicle-mounted power supply circuit converts DC24V power obtained from a locomotive power supply into DC15V power supply output;
the vehicle-mounted signal processing circuit comprises a power supply circuit, an antenna interface and receiving circuit, a detection circuit, a power amplification circuit, an FPGA circuit, an MCU circuit and a communication circuit; the power supply circuit converts the DC15V input power supply voltage into 5.25V, 5V, 3.3V and 1.2V power supply voltages and provides required power supply voltages DC15V, DC5V, DC3.3V and DC1.2V for the vehicle-mounted signal processing circuit; the power amplification circuit is used for carrying out two-stage power amplification on the vehicle-mounted 27MHz signal; the FPGA circuit is used for encoding and outputting vehicle-mounted signals and decoding message information of the ground transponder; the detection circuit is used for power amplifier control, vehicle-mounted antenna unit self-detection, antenna detection, MCU temperature detection, power amplifier power detection and power amplifier current detection; the MCU circuit is used as a control core of the vehicle-mounted host unit to complete communication with the outside and control and monitoring of the internal circuit; the antenna interface and receiving circuit comprises a receiving-transmitting interface circuit and a receiving circuit, the receiving-transmitting interface circuit is connected with the vehicle-mounted antenna unit by adopting a radio frequency interface, a filter is used for isolating a receiving-transmitting channel, and the receiving circuit processes the received ground signal; the communication circuit comprises one path of isolation RS422 and one path of isolation CAN, and communication between the MCU circuit and the vehicle-mounted computer is realized.
Further, the ground signal receiving unit performs data communication with the vehicle-mounted antenna unit in a radio frequency mode, the ground signal receiving unit performs data communication with the ground signal processing unit through the RS422, and the ground signal receiving unit obtains the DC5V power supply from the ground signal processing unit.
Furthermore, the ground signal receiving unit comprises an analog circuit, a digital circuit, a message receiving circuit, a wireless write-in circuit and an RS422 interface circuit; the analog circuit comprises a modulation amplification circuit and is used for carrying out FSK modulation and amplification on the message information of the transponder to be sent out; the digital circuit comprises a power supply circuit, an MCU circuit, a message storage circuit and a voltage acquisition circuit, wherein the power supply circuit converts a DC5V power supply acquired from the ground signal processing unit into power supply voltages of 3.3V and 1.5V and provides the power supply voltages of DC5V, DC3.3V and DC1.5V; the MCU circuit is communicated with the ground signal processing unit, processes the received vehicle-mounted information, controls and sends 4.2MHz message information, and completes message writing together with the wireless writing circuit; the message storage circuit is used for storing fixed messages written into the message storage circuit; the voltage acquisition circuit is used for acquiring voltage provided by the power supply circuit; the wireless write circuit writes a fixed message into the ground signal receiving unit; the message receiving circuit is used for receiving a downlink vehicle-mounted 27MHz signal transmitted by the vehicle-mounted host unit, processing the signal and transmitting the processed signal to the MCU circuit, and the processed signal is transmitted to the ground signal processing unit; and the RS422 interface circuit adopts an RS422 chip and is communicated with the ground signal processing unit.
Furthermore, the ground signal processing unit is in communication connection with the turnout control center through a network communication interface, the ground signal processing unit obtains 220V alternating current from a ground power supply, and the ground processing unit is in data communication with the two ground signal receiving units through RS422 and provides DC5V power for the two ground signal receiving units.
Furthermore, the ground signal processing unit comprises a power circuit, a control circuit, a ground signal receiving unit interface circuit and a turnout control center interface circuit; the power supply circuit converts 220V alternating current voltage into 12V and 3.3V direct current voltage and provides power supply voltages DC12V and DC3.3V; the control circuit converts the signals sent by the ground signal receiving unit into network signals and level signals and sends the network signals and the level signals to the turnout control center; the ground signal receiving unit interface circuit is used for connecting the ground signal receiving unit and the control circuit; and the turnout control center interface circuit is used for connecting the turnout control center and the control circuit.
Compared with the prior art, the utility model has the following advantages:
the track section occupation detection system comprises a vehicle-mounted device and a ground device, wherein the vehicle-mounted device comprises a vehicle-mounted host unit and a vehicle-mounted antenna unit, and the ground device comprises a ground signal receiving unit and a ground signal processing unit; the vehicle-mounted host unit communicates with the vehicle-mounted computer to acquire information such as a vehicle number and the like and sends the information to the ground equipment, and meanwhile, the information such as a station name and the like sent by the ground equipment is sent to the vehicle-mounted computer; the ground signal receiving unit receives information such as a vehicle number and the like sent by the vehicle-mounted equipment and sends information such as a station name and the like to the vehicle-mounted equipment; when the ground signal receiving unit detects that the tramcar passes through, the ground signal processing unit outputs 24V switching value (low level) to the turnout control center to indicate that the tramcar passes through. The turnout control center can analyze the occupation state of a certain section in real time according to the section occupation information provided by the ground signal processing unit, provide reliable data support for train running and dispatching, ensure the running safety and effectively avoid the life and property loss caused by the rail train collision rear-end collision accident.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic deployment view of a track segment occupancy detection system of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a track segment occupancy detection system according to an embodiment of the present invention;
FIG. 3 is a functional block diagram of an in-vehicle host unit of an embodiment of the present invention;
fig. 4 is a functional block diagram of a terrestrial signal receiving unit according to an embodiment of the present invention;
fig. 5 is a functional block diagram of a power supply circuit of a terrestrial signal receiving unit according to an embodiment of the present invention;
fig. 6 is a voltage acquisition circuit of the ground signal receiving unit according to the embodiment of the present invention;
fig. 7 is a functional block diagram of a ground signal processing unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
The track section occupancy detection system of the present embodiment, as shown in fig. 1, includes two parts, namely, a vehicle-mounted device and a ground device; the vehicle-mounted equipment comprises a vehicle-mounted host unit and a vehicle-mounted antenna unit; the vehicle-mounted main unit is arranged in a carriage, and the vehicle-mounted antenna unit is arranged at the lower part of a vehicle body; the vehicle-mounted host unit communicates with the vehicle-mounted computer to acquire information such as a vehicle number and the like and sends the information to the ground equipment, and meanwhile, the information such as a station name and the like sent by the ground equipment is sent to the vehicle-mounted computer. The ground equipment comprises a ground signal receiving unit and a ground signal processing unit; the ground signal receiving unit is arranged in the middle of a track line in a redundant mode, and the ground signal processing unit is arranged in a trackside cabinet; the ground signal receiving unit receives information such as a vehicle number and the like sent by the vehicle-mounted equipment and sends information such as a station name and the like to the vehicle-mounted equipment; when the ground signal receiving unit detects that the tramcar passes through, the ground signal processing unit outputs 24V switching value to the turnout control center, and the 24V switching value outputs low level to indicate that the tramcar passes through.
The ground signal receiving units are arranged in a double-set redundancy mode, when a signal receiving circuit, a cable, a connector assembly and the like of one path of ground signal receiving unit have faults, the other path of ground signal receiving unit can still maintain the system to work, and therefore the reliability of the system is improved.
In addition, after any one of the ground signal receiving unit or the ground signal processing unit breaks down, the 24V switching value output by the ground signal processing unit is at a low level, which indicates that the current section has the vehicle occupation.
Specifically, as shown in fig. 2, the on-board host unit is connected to the on-board antenna unit through a coaxial line, the on-board host unit communicates with the on-board computer through RS422, and the on-board host unit obtains DC24V power from the locomotive power supply.
As shown in fig. 3, the in-vehicle host unit includes an in-vehicle signal processing circuit and an in-vehicle power supply circuit, and the in-vehicle power supply circuit supplies DC15V operating power to the in-vehicle signal processing circuit; the vehicle-mounted signal processing circuit completes communication with the ground signal receiving unit through the connected vehicle-mounted antenna unit, sends vehicle-mounted 27MHz signals to the ground signal receiving unit, receives and decodes 4.2MHz signals sent by the ground signal receiving unit, and sends the decoded signals to the vehicle-mounted computer.
The vehicle power circuit converts the DC24V power obtained from the locomotive power supply into DC15V power output. The input power from the vehicle is DC24V, the power is sent to the vehicle power circuit through the power interface, after a self-recovery insurance, the power is sent to the 24V-to-15V power module VRB2415LD-40WR3 after filtering, and the DC15V output by the power module is sent to the vehicle signal processing circuit through the power output interface for use. Wherein the EMC filter uses a golden rising anode FC-D03D.
The vehicle-mounted signal processing circuit comprises a power supply circuit, an antenna interface and receiving circuit, a detection circuit, a power amplifier circuit, an FPGA circuit, an MCU circuit and a communication circuit, the seven parts jointly complete the functions of a vehicle-mounted host unit, and the seven parts are explained in detail below:
the main function of the power supply circuit is to convert the DC15V input power supply voltage into 5.25V, 5V, 3.3V and 1.2V power supply voltages, and provide the required power supply voltages DC15V, DC5V, DC3.3V and DC1.2V for the vehicle-mounted signal processing circuit. Firstly, converting an input 15V voltage into a 5.25V voltage by adopting a power supply conversion chip LMR14020 SDDA; secondly, 5.25V is converted into 3.3V, and 3.3V is converted into 1.2V again; and finally, converting 5.25V into 5V by using a power conversion chip TPS73250DBV, and supplying power to a crystal oscillator, a buffer circuit, a bias circuit and a detection circuit in the power amplification circuit.
The power amplifier circuit is mainly used for carrying out two-stage power amplification on the vehicle-mounted 27MHz signal. The power amplifier part adopts a small-package (7mm x 5mm) crystal oscillator to generate a 27MHz signal which is a CMOS level signal, and the driving capability of the oscillator is weak, so that buffering is performed through an NAND gate (SN74LVC2G00W-EP) to improve the driving capability. The power supply voltage of the NAND gate is 5V, the output of the NAND gate is a square wave signal, a low-pass filter is needed to filter out harmonic waves, and finally a pure sine wave is obtained. The nand gate output is connected in series with a 50 ohm resistor for matching to the input impedance of the driver amplifier. After filtering, the filter is connected in series with a pi-type attenuator, and the peak value of a signal transmitted to the drive amplifier is between 1.3V and 2.5V. Because the static bias current and gain of different power amplifier tubes are poor in consistency, the power value fed into the driving amplifier needs to be adjusted by adjusting the attenuation value of the pi-type attenuator, so that the final output power meets the specified requirements. The drive amplifier adopts MRF158 of MACOM company, the gain of the drive amplifier is 20dB, and 2W of radio frequency power can be output to the maximum; the MRF171A is adopted in the last stage of power amplifier tube, the maximum gain of small signals of the power amplifier tube is 20dB, and the maximum output power is 45W. The two-stage amplifying circuit is powered by DC15V, and the crystal oscillator and ASK modulation part are powered by DC 5V. In addition, the vehicle number information sent by the FPGA is input into a buffer NAND gate in the power amplifier circuit, so that 27MHz carrier waves are modulated in an ASK mode and sent to ground equipment. In order to ensure that the ground equipment can reliably receive the 27MHz signal transmitted by the vehicle-mounted antenna unit, the ASK modulated vehicle number information adopts a Manchester coding mode.
The FPGA circuit is mainly used for encoding output of vehicle-mounted signals and decoding message information of the ground transponder. The hardware comprises an FPGA kernel, a memory and a24 MHz active crystal oscillator, wherein a peripheral interface of the FPGA kernel, the memory and the 24MHz active crystal oscillator are powered by DC3.3V, the FPGA kernel is powered by DC1.2V, and the 24MHz active crystal oscillator provides a clock for the FPGA kernel. The FPGA kernel provides vehicle-mounted signals for the power amplifier circuit, and receives ground FSK demodulation signals sent by the antenna interface and the receiving circuit.
The detection circuit is mainly used for power amplifier control, vehicle-mounted antenna unit self-detection, antenna detection, MCU temperature detection, power amplifier power detection and power amplifier current detection.
(1) Power amplifier control
The power amplifier control is realized by controlling the bias power supply of the two stages of power amplifier tubes, and the specific realization is as follows: the MCU sends a high-low level (PA _ DIS) to control whether the two triodes are conducted or not, when the PA _ DIS is set to be low, the two triodes are positioned in a cut-off area, a 5V power supply provides bias voltage for a driving tube and a grid electrode of a final-stage power amplifier through resistance voltage division, and the final bias voltage is provided for the two amplifying tubes after the voltage division is carried out by using the resistance voltage division; when the PA _ DIS is set high, the triode is in a saturated conducting area, the grid voltage of the driving tube and the final power amplifier is about 0V, and the power amplifier tube is in a turn-off cut-off state.
(2) Vehicle antenna unit self-test
When the vehicle-mounted host is powered on, the MCU outputs a control signal (ANT _ CHECK _ EN) with a fixed time length through the IO port, the self-checking circuit provides a direct current signal with the maximum 14.2mA (the resonance state of the transponder circuit arranged in the antenna can influence the magnitude of the power supply current), and the direct current signal is transmitted to the vehicle-mounted antenna through the coaxial cable. The working principle is as follows: ANT _ CHECK _ EN is set high, U404A outputs low level, Q401 is turned on accordingly, Q402 is turned on and works in an amplifying state, and the maximum output current can be adjusted by adjusting the resistor R443. The self-test dc is connected to the output of the receiving low-pass filter, so that there is no fear that the circuit will affect the transmit path.
(3) Antenna detection
The antenna detection circuit is used for monitoring the magnetic field energy emitted from the antenna unit. When the vehicle-mounted power amplifier normally works, a printed small-loop antenna is arranged in the antenna unit and used for collecting partial downlink magnetic field energy, and the downlink magnetic field energy is rectified into direct current voltage through a detection circuit, and the direct current voltage is negative voltage. The direct current voltage is transmitted to the power amplification board through the coaxial line, is transmitted to the signal conditioning circuit through the receiving low-pass filter to be reversed and converted into positive voltage, and is finally transmitted to the ADC of the MCU part for collection. The signal conditioning circuit adopts a reverse amplification mode, converts the antenna detection voltage with negative polarity into a signal with positive polarity, and the amplification factor is-1. When the absolute value of the detected voltage of the antenna is very small, which means that the energy of the magnetic field is weakened or a downlink is in problem, the fault point can be in the antenna unit, the antenna feeder cable and the power amplification circuit. When the absolute value of the detected voltage of the antenna is greater than a certain threshold value, the emitted magnetic field energy is increased.
(4) MCU temperature detection
And the vehicle-mounted signal processing circuit adopts a temperature sensor to detect the ambient temperature around the MCU of the PCB board in real time, and when the ambient temperature exceeds the upper limit of the allowable working temperature of the MCU, the MCU can send an alarm signal to the detection software. The temperature detection uses MAXIM 31723 industrial grade temperature sensor, and can detect the temperature in the range of-20 ℃ to 125 ℃.
(5) Power amplifier power detection
The power detection circuit adopts a capacitor to couple out a small part of power and sends the power to a detection tube for detection, the detection tube is connected with a 100 ohm redundant load, and the detection output is sent to an ADC (analog to digital converter) in the MCU for collection after being filtered and amplified. Meanwhile, the amplified detection voltage signal is compared with a reference level (initially set to 1.24V), and when the detection voltage signal exceeds the reference level, the detection voltage signal is output to be a high level, so that a power amplifier logic control circuit is controlled, and the power amplifier is turned off.
(6) Power amplifier current detection
A30 m omega precision resistor is connected in series with a 15V power line of a power amplifier, an INA240 current detection amplifier with an enhanced PWM (pulse width modulation) inhibition function of TI company is utilized to detect and amplify the voltage difference between two ends of the precision resistor, and the power supply current of the power amplifier can be calculated according to ohm's law. The output voltage of the INA240 is connected to an ADC pin of the MCU, the voltage value is acquired by the MCU, and the power supply current of the power amplifier is obtained through conversion.
The MCU circuit is used as a control core of the vehicle-mounted host unit to complete communication with the outside and control and monitoring of the internal circuit. The MCU communicates with the vehicle-mounted computer through the RS422 interface to acquire the vehicle number information, and decodes the transponder message information decoded by the FPGA circuit and then sends the decoded transponder message information to the vehicle-mounted computer. The MCU and the FPGA adopt serial port communication, and the MCU is supported to reset the FPGA. MCU has still realized the AD sampling to on-vehicle signal processing circuit's all powers, uses resistance partial pressure, sends system's power into control chip's ADC foot, realizes mains voltage and detects. The temperature detection uses a MAX31723 industrial grade temperature sensor of SPI interface. And the ADC pin of the control chip is connected with an antenna detection value, a power amplifier power detection value and a power amplifier current detection value which are sent by the detection circuit, so that the parameter detection of the circuit is realized.
The antenna interface and receiving circuit comprises a transceiving interface circuit and a receiving circuit; the receiving and transmitting interface circuit is connected with the vehicle-mounted antenna unit by adopting a radio frequency interface, and filters are used for isolating the receiving and transmitting channels. Different filter circuits separate the downlink transmission signal (vehicle-to-ground 27MHz signal) and the uplink signal (ground-to-vehicle 4.2MHz signal), thereby effectively inhibiting mutual interference between the transmission channel and the receiving channel. The filter circuit comprises a transmitting band-pass filter, a receiving low-pass filter circuit and a receiving band-pass filter. The receiving low-pass filter circuit adopts a 9-order LC Chebyshev low-pass filter, and the attenuation at the stop band of 27.095MHz is more than 50 dB. The receiving band-pass filter is realized by connecting a high-pass filter and a low-pass filter in series, the high-pass filter adopts a Butterworth high-pass filter for filtering, and the low-pass filter adopts a Butterworth and Chebyshev combined mode for filtering. The transmit bandpass filter includes two LC series resonances and two LC parallel resonances. The receiving circuit processes the received ground signal and comprises a signal demodulation circuit, an amplification and shaping circuit of the demodulated signal and a threshold signal judgment circuit; the signal demodulation circuit adopts a chip SA636 of NXP (Enzhipu) to complete FSK signal demodulation. The amplifying and shaping circuit is mainly used for amplifying and shaping signals output by the signal demodulating circuit and amplifying weak FSK message signals into FSK message signals which can be identified by the FPGA. The signal output by the SK636 chip passes through a low-pass filter, a signal amplifying circuit, a signal voltage following circuit, a peak detection circuit and a voltage comparison circuit respectively, and finally a digital level signal is output and sent to the FPGA chip. The threshold signal decision circuit is used for shaping the RSSI analog signal output by the signal demodulation circuit into digital high and low levels through the threshold signal shaping circuit and sending the digital high and low levels to the FPGA chip, the threshold signal reflects the strength of the received ground signal, a system program can conveniently screen reported data, and false alarm or false alarm is prevented.
The communication circuit comprises one path of isolation RS422 and one path of isolation CAN, and communication between the MCU circuit and the vehicle-mounted computer is realized. The RS422 communication interface isolation and conversion circuit adopts ADM2587 of ADI company, and the chip is a UART-to-RS-485 chip. The CAN communication interface isolation and conversion circuit adopts ADM3053BRWZ of ADI company, and the interface is a reserved interface. The RS-422 and CAN communication interface connectors are combined with DB9 hole type connectors, so that the fixing is convenient, and the communication with the vehicle-mounted computer is realized through the interface.
Specifically, as shown in fig. 2, the ground signal receiving unit performs data communication with the vehicle-mounted antenna unit in a radio frequency manner, the ground signal receiving unit performs data communication with the ground signal processing unit through the RS422, and the ground signal receiving unit obtains a DC5V power supply from the ground signal processing unit.
As shown in fig. 4, the ground signal receiving unit includes an analog circuit, a digital circuit, a message receiving circuit, a wireless write circuit, and an RS422 interface circuit. The analog circuit comprises a modulation amplification circuit and a wireless power taking circuit; the modulation amplifying circuit carries out FSK modulation and amplification to the message information of the transponder to be sent, FSK (Frequency-shift keying) Frequency shift keying, which is a digital modulation technology for keying carrier Frequency by using the discrete value characteristic of baseband digital signals to transmit information, and has the main advantages that: easy to realize and has better anti-noise and anti-attenuation performances. The most common dual frequency FSK modulation is used here, which carries binary 1's and 0's at two frequencies. Wireless circuit of getting: the ground signal receiving unit obtains the power supply when the message is wirelessly written by the induction voltage, and the implementation mode is bridge rectification, namely a bridge rectification circuit, namely a rectifier bridge formed by diodes. The digital circuit comprises a power supply circuit, an MCU circuit, a message storage circuit and a voltage acquisition circuit, wherein as shown in FIG. 5, the power supply circuit converts a DC5V power supply acquired from the ground signal processing unit into power supply voltages of 3.3V and 1.5V; due to the function of writing messages wirelessly, energy obtained by a 27M resonant antenna is rectified in a bridge mode, and the converted direct current level passes through a voltage stabilizing tube of 6.2V and then is directly supplied to a power chip to generate 5V, 3.3V and 1.5V. The MCU circuit is realized by a main control chip FPGA (A3PN250-VQG100I) and a peripheral circuit, and has the main functions of: the wireless write-in circuit is used for communicating with a ground signal processing unit, processing received vehicle-mounted information, controlling and sending 4.2MHz message information, and completing message write-in together with a wireless write-in circuit. The message storage circuit is used for storing the fixed message written inside and uses the 4K-bit serial EEPROM memory device 93AA66CT-E/SN of MICROCHIP. As shown in fig. 6, the voltage acquisition circuit is used for acquiring the voltage provided by the power supply circuit, specifically, two ADC chips ADC082S021 with SPI interfaces are used for respectively acquiring DC5V provided by the ground signal processing unit, and VCC3V3_1, VCC3V3_2, and VCC1V5 converted by the LDO chip. The wireless write circuit writes a fixed message into the ground signal receiving unit, processes the wirelessly received signal in a wireless communication mode and then directly sends the processed signal to the FPGA, and the message is written into a message storage chip after being processed by the FPGA. The message receiving circuit receives downlink vehicle-mounted 27MHz ASK signals transmitted by the vehicle-mounted host unit, processes the wirelessly received signals in a wireless communication mode, directly transmits the processed signals to the FPGA, transmits the processed signals to the ground signal processing unit, and after the downlink 27MHz signals are detected, the FPGA is started to transmit uplink 4.2MHz signals. The RS422 interface circuit adopts an RS422 chip to communicate with the ground signal processing unit, the RS422 adopts ADM2587E and a magnetic isolation type full-duplex RS-422 transceiver, and the ADM2587E is an isolation type RS-422 transceiver chip based on the iCoupler magnetic isolation technology and provided by ADI company.
Specifically, as shown in fig. 2, the ground signal processing unit is in communication connection with the turnout control center through a network communication interface, the ground signal processing unit obtains 220V alternating current from the ground power supply, and the ground processing unit performs data communication with the two ground signal receiving units through RS422 and provides a DC5V power supply for the two ground signal receiving units.
As shown in fig. 7, the ground signal processing unit includes a power circuit, a control circuit, a ground signal receiving unit interface circuit and a switch control center interface circuit; the power supply circuit converts 220V alternating current voltage into 12V and 3.3V direct current voltage and provides power supply voltages DC12V and DC3.3V, a Kingsheng power supply module LD10-23B12R2 is selected from 220V to 12V, and a TI DC/DC chip TPS54202DDCR is selected from 12V to 3.3V. The control circuit converts signals sent by the ground signal receiving units into network signals and level signals and sends the network signals and the level signals to a turnout control center, a GD32F107VT chip is selected as a control chip, two paths of serial ports are used for respectively communicating with the two ground signal receiving units, information occupied by intervals is obtained, pulse signals are used for controlling communication output, an MII interface of the control chip is used, the information occupied by the intervals is converted into the network signals through a PHY chip DP83848I and sent to the turnout control center, the +24V level is controlled and output through the pulse control signals, and the information occupied by the intervals is sent to the turnout control center through the level signals; the ground signal receiving unit interface circuit is used for connecting the ground signal receiving unit and the control circuit, the interface isolation and conversion circuit selects ADM2587 of ADI company, the chip is a UART-to-RS-485 chip, the interface protection part selects TVS tube and connects with self-recovery fuse in series, the connector selects cage type spring connector, the power output conversion part selects WRB1205SD-3WR2 power module of Jinshengyang company, and one power module is used for supplying power for two ground signal receiving units. The turnout control center interface circuit is used for connecting a turnout control center and a control circuit, a network part uses an MII interface of a CPU, DP83848I of TI company is selected as a PHY chip, an interface protection uses a network transformer and an ESD protection, a network connector uses a shielded RJ45 socket, a 24V level output uses a Jinshengyangyang B1224XT-1WR2 power module, the output voltage is 24V, in order to control the state of the output level, an optical coupling relay AQY211R2S is used for output control, a control signal is a pulse signal, when the pulse signal exists, the +24V level output shows a no-vehicle state, and when the pulse signal does not exist or equipment fails, the +24V output interface outputs a low level to show a vehicle state.
The working process of the track section occupation detection system of the embodiment is as follows:
when the vehicle-mounted host unit works, the radio frequency signal is continuously sent to the ground through the vehicle-mounted antenna unit;
when a ground signal receiving unit exists in the radiation range of the radio frequency signal, the ground signal receiving unit is activated to start the internal transmission of 4.2MHz signals, and meanwhile, the ground signal receiving unit receives vehicle-mounted 27MHz signals sent by the vehicle-mounted antenna unit;
the ground signal processing unit acquires the interval occupation information output by the ground signal receiving unit, converts the interval occupation information into a level signal and a network signal, outputs the level signal and the network signal to the turnout control center, and controls the turnout control center according to the section occupation state.
The turnout control center can position the position information of the tramcar according to the ground transponder message information and determine a specific vehicle according to the vehicle number information; the level signal is a 24V switching value, and the 24V switching value outputs a low level to indicate that a vehicle passes through.
The track section occupation detection system is independent on a single set of ground equipment at each station, and after the tramcar passes through the system, a ground signal processing unit of the system outputs 24V switching value (low level) to a turnout control center, for example: the tramcar sequentially passes through the outbound track occupation detection device of the station 1 and the inbound track occupation detection device of the station 2, and the occupied state is released when the tramcar passes through the zone.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A track section occupation detection system is characterized by comprising vehicle-mounted equipment and ground equipment;
the vehicle-mounted equipment comprises a vehicle-mounted host unit and a vehicle-mounted antenna unit; the vehicle-mounted main unit is arranged in a carriage, and the vehicle-mounted antenna unit is arranged at the lower part of a vehicle body; the vehicle-mounted host unit communicates with the vehicle-mounted computer to acquire the number information and send the number information to the ground equipment, and meanwhile, the station name information sent by the ground equipment is sent to the vehicle-mounted computer;
the ground equipment comprises a ground signal receiving unit and a ground signal processing unit; the ground signal receiving unit is arranged in the middle of a track line in a redundant mode, and the ground signal processing unit is arranged in a trackside cabinet; the ground signal receiving unit receives the train number information sent by the vehicle-mounted equipment and sends the train station name information to the vehicle-mounted equipment; when the ground signal receiving unit detects that the tramcar passes through, the ground signal processing unit outputs 24V switching value to the turnout control center, and the 24V switching value outputs low level to indicate that the tramcar passes through.
2. The track section occupancy detection system of claim 1, wherein the on-board host unit is connected to the on-board antenna unit by a coaxial line, the on-board host unit being in data communication with the on-board computer via RS422, the on-board host unit drawing DC24V power from the vehicle power supply.
3. The track section occupancy detection system of claim 2, wherein the on-board host unit comprises an on-board signal processing circuit and an on-board power supply circuit; the vehicle-mounted power supply circuit provides a DC15V working power supply for the vehicle-mounted signal processing circuit; the vehicle-mounted signal processing circuit is communicated with the ground signal receiving unit through the connected vehicle-mounted antenna unit, the vehicle-mounted 27MHz signal is sent to the ground signal receiving unit, meanwhile, the 4.2MHz signal sent by the ground signal receiving unit is received and decoded, and the decoded signal is sent to the vehicle-mounted computer.
4. The track section occupancy detection system of claim 3, wherein the onboard power circuit converts DC24V power drawn from a locomotive power supply to a DC15V power output;
the vehicle-mounted signal processing circuit comprises a power supply circuit, an antenna interface and receiving circuit, a detection circuit, a power amplification circuit, an FPGA circuit, an MCU circuit and a communication circuit; the power supply circuit converts the DC15V input power supply voltage into 5.25V, 5V, 3.3V and 1.2V power supply voltages and provides required power supply voltages DC15V, DC5V, DC3.3V and DC1.2V for the vehicle-mounted signal processing circuit; the power amplification circuit is used for carrying out two-stage power amplification on the vehicle-mounted 27MHz signal; the FPGA circuit is used for encoding and outputting vehicle-mounted signals and decoding message information of the ground transponder; the detection circuit is used for power amplifier control, vehicle-mounted antenna unit self-detection, antenna detection, MCU temperature detection, power amplifier power detection and power amplifier current detection; the MCU circuit is used as a control core of the vehicle-mounted host unit to complete communication with the outside and control and monitoring of the internal circuit; the antenna interface and receiving circuit comprises a receiving-transmitting interface circuit and a receiving circuit, the receiving-transmitting interface circuit is connected with the vehicle-mounted antenna unit by adopting a radio frequency interface, a filter is used for isolating a receiving-transmitting channel, and the receiving circuit processes the received ground signal; the communication circuit comprises one path of isolation RS422 and one path of isolation CAN, and communication between the MCU circuit and the vehicle-mounted computer is realized.
5. The track segment occupancy detection system of claim 1, wherein the ground signal receiving unit is in data communication with the vehicle-mounted antenna unit via radio frequency, the ground signal receiving unit is in data communication with the ground signal processing unit via RS422, and the ground signal receiving unit obtains DC5V power from the ground signal processing unit.
6. The track segment occupancy detection system of claim 5, wherein the ground signal receiving unit comprises analog circuitry, digital circuitry, message receiving circuitry, wireless write circuitry, and RS422 interface circuitry; the analog circuit comprises a modulation amplification circuit and is used for carrying out FSK modulation and amplification on the message information of the transponder to be sent out; the digital circuit comprises a power supply circuit, an MCU circuit, a message storage circuit and a voltage acquisition circuit, wherein the power supply circuit converts a DC5V power supply acquired from the ground signal processing unit into power supply voltages of 3.3V and 1.5V and provides the power supply voltages of DC5V, DC3.3V and DC1.5V; the MCU circuit is communicated with the ground signal processing unit, processes the received vehicle-mounted information, controls and sends 4.2MHz message information, and completes message writing together with the wireless writing circuit; the message storage circuit is used for storing fixed messages written into the message storage circuit; the voltage acquisition circuit is used for acquiring voltage provided by the power supply circuit; the wireless write circuit writes a fixed message into the ground signal receiving unit; the message receiving circuit is used for receiving a downlink vehicle-mounted 27MHz signal transmitted by the vehicle-mounted host unit, processing the signal and transmitting the processed signal to the MCU circuit, and the processed signal is transmitted to the ground signal processing unit; and the RS422 interface circuit adopts an RS422 chip and is communicated with the ground signal processing unit.
7. The track segment occupancy detection system of claim 1, wherein the ground signal processing unit is communicatively connected to the turnout control center via a network communication interface, the ground signal processing unit obtains 220V ac power from a ground power supply, and the ground signal processing unit performs data communication with the two-way ground signal receiving unit via RS422 and provides DC5V power to the two-way ground signal receiving unit.
8. The track section occupancy detection system of claim 7, wherein the ground signal processing unit includes a power circuit, a control circuit, a ground signal receiving unit interface circuit, and a switch control center interface circuit; the power supply circuit converts 220V alternating current voltage into 12V and 3.3V direct current voltage and provides power supply voltages DC12V and DC3.3V; the control circuit converts the signals sent by the ground signal receiving unit into network signals and level signals and sends the network signals and the level signals to the turnout control center; the ground signal receiving unit interface circuit is used for connecting the ground signal receiving unit and the control circuit; and the turnout control center interface circuit is used for connecting the turnout control center and the control circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121948655.3U CN215436447U (en) | 2021-08-19 | 2021-08-19 | Track section occupation detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121948655.3U CN215436447U (en) | 2021-08-19 | 2021-08-19 | Track section occupation detection system |
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| CN215436447U true CN215436447U (en) | 2022-01-07 |
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|---|---|---|---|
| CN202121948655.3U Active CN215436447U (en) | 2021-08-19 | 2021-08-19 | Track section occupation detection system |
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| CN (1) | CN215436447U (en) |
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