CN105721372B - Communicate loop wire - Google Patents
Communicate loop wire Download PDFInfo
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- CN105721372B CN105721372B CN201610090681.4A CN201610090681A CN105721372B CN 105721372 B CN105721372 B CN 105721372B CN 201610090681 A CN201610090681 A CN 201610090681A CN 105721372 B CN105721372 B CN 105721372B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/12—Modulator circuits; Transmitter circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/70—Details of trackside communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/16—Frequency regulation arrangements
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mechanical Engineering (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
A kind of communication loop wire for electric car train-ground communication, it includes along the induction loop portion and vehicle-mounted signal transmitting and receiving portion of track laying, the induction loop portion includes X-shape induction loop and communication module, the signal transmitting and receiving portion includes dual-mode antenna and communication module, and the communication module includes 2FSK modulation circuit and 2FSK demodulator circuit.The modulation circuit includes single-chip microcontroller, reference clock source, digital controlled oscillator, phase-modulator, look-up table block, digital analog converter and amplifying circuit.The demodulator circuit includes pressure limiting module, phase discriminator, loop filter, voltage controlled oscillator, amplifying circuit, clamp circuit and Schmidt trigger.Communication link cable architecture of the invention has controllability, is applicable to a variety of application environments, is more suitable for modular applications.
Description
Technical field
The present invention relates to communication loop wire fields, more particularly relate to the communication link that tramcar carries out train-ground communication
Line.
Background technique
Train-ground communication is primarily referred to as the communication by tramcar and track between equipment, is usually by being embedded in track
On loop wire and the dual-mode antenna on tramcar car body establish the nothing between tramcar mobile unit and trackside equipment
Line data communication.
The loop wire being embedded in track can be used for realizing the data communication with tramcar mobile unit, and may be mounted at
Among track, to adapt to integral cement railway roadbed or tiny fragments of stone, coal, etc. stone railway roadbed environment, and grass can be covered on the loop wire installed
Level ground or the asphalting after cement protects are the effective solutions of modern tram train-ground communication and auxiliary positioning.
Communication loop wire for tramcar communication generally includes the induction loop portion being set on track and is set to rail electricity
Signal transmitting and receiving portion on vehicle.Induction loop portion mainly includes the induction loop along track laying, and for sending out to induction loop
Send or receive from induction loop the communication module of communication data.Signal transmitting and receiving portion mainly include signal transmitting and receiving antenna and for
Induction loop sends or receives from induction loop the communication module of communication data.It is logical in signal transmitting and receiving portion and induction loop portion
Letter module can be consistent, which mainly includes modulating and demodulating signal circuit and corresponding power amplification circuit.
Summary of the invention
The invention proposes a kind of communication loop wires for electric car train-ground communication, wherein using X-shape induction loop along electricity
Vehicle track laying, vehicle-mounted signal transmitting and receiving portion use the single antenna structure of transceiver, so that communication module is adopted compared to existing
The communication module stood under set-up mode with receiving-transmitting antenna separating is more simple, reduces the overall complexity and cost of system.Accordingly
Ground has also carried out corresponding design to communication module structure, it is made also to can guarantee communication loop wire tool in this single antenna structure
Have higher at code rate and stability.In addition, communication link cable architecture of the invention has controllability, it is applicable to a variety of applications
Environment is more suitable for modular applications.
Communication loop wire according to the present invention may include the induction loop portion along track laying and vehicle-mounted signal transmitting and receiving
Portion.The induction loop portion includes induction loop and communication module, and the signal transmitting and receiving portion includes dual-mode antenna and communication module,
The induction loop be X-shape, the dual-mode antenna be single antenna, the communication module include 2FSK modulation circuit and
2FSK demodulator circuit；The modulation circuit includes single-chip microcontroller, reference clock source, digital controlled oscillator, phase-modulator, inquiry table mould
Block, digital analog converter and amplifying circuit；Wherein, the reference clock source is used to provide reference clock letter for the digital controlled oscillator
Number；The digital controlled oscillator includes phase accumulator, and the single-chip microcontroller exports control signal to the digital controlled oscillator to control
The phase step of the phase accumulator；The phase-modulator carries out phase-modulation to the output of digital controlled oscillator, and exports
To the look-up table block, phase information is converted by amplitude information by the look-up table block, to obtain sine wave wave
The amplitude discrete value of shape；Digital analog converter believes the amplitude discrete value conversion output analog sine electric current of the sine waveform
Number；The amplifying circuit includes operational amplifier U1, is used to the current analog signal that analog-digital converter exports being converted to electricity
Pressure analog signal simultaneously carries out signal amplification, wherein current analog signal is input to institute through capacitance C1 by the digital analog converter
State the non-inverting input terminal of operational amplifier U1；The inverting input terminal of the operational amplifier connects via adjustable resistance and power circuit
It connects, the resistance value by adjusting the adjustable resistance changes the yield value of the amplifying circuit, to realize the adjustable of gain amplifier.
Wherein, the demodulator circuit may include pressure limiting module, phase discriminator, loop filter, voltage controlled oscillator, amplification electricity
Road, clamp circuit and Schmidt trigger；The pressure limiting module includes diode and triode, the received tune of dual-mode antenna
Signal processed inputs the pressure limiting module through capacitance, so that output voltage amplitude allows in the pressure limiting module by range
Signal；The phase discriminator, the loop filter and the voltage controlled oscillator constitute phase-locked loop structures；The phase discriminator is also right
Two signals of input carry out phase bit comparison, and the phase difference based on the two exports corresponding phase potential difference；The loop filtering
Device is made of resistance and capacitor, filters out high frequency and noise contribution from the phase potential difference that the phase discriminator exports；The difference
Voltage is amplified after being filtered by the amplifying circuit, and is divided into two paths of signals, wherein signal is input directly into all the way
The extremely Schmidt trigger, and another way signal is input to the schmidt trigger after then handling via the clamp circuit
Device；Wherein, when the phase-locked loop structures are in the lock state, another way difference voltage signal through the clamp circuit at
Be formed as the reference voltage determined by two frequency values in the modulated signal after reason.
Further, the demodulator circuit may include frequency adjustment circuit, for connect with the voltage controlled oscillator with
Change the centre frequency of the voltage controlled oscillator, the frequency adjustment circuit by changing the capacitance of the voltage controlled oscillator
It is made of 2 variable connectors and one group of capacitor；Each variable connector includes 4 switches, and one group of capacitor includes 4 capacitances
The on or off of different capacitors, the switch is controlled by the single-chip microcontroller.
Further, the signal transmitting and receiving portion may include numerical control analog switch module, for realizing the signal transmitting and receiving
Switching of the portion between signal sending mode and signal receiving modes；The numerical control analog switch module includes 2 bidirectional analogs
Switch, each of described bilateral analog switch all have input, output end and control terminal, the bilateral analog switch
The control terminal is connect with the single-chip microcontroller controls the conducting of the analog switch to receive the control signal of the single-chip microcontroller
Or close, the input terminal of one of described bilateral analog switch connects the modulation circuit and output end connects the transmitting-receiving day
Line, to constitute signal of communication sendaisle；Another input terminal in the bilateral analog switch connects the transmitting-receiving day
Line and the output end connection demodulator circuit, to constitute signal of communication receiving channel.
Further, communication loop wire of the invention may include the common reference clock mould being set in central control room
Block, the common reference clock module include common reference clock source and several adjustable delay chips, when the common reference
The output signal of Zhong Yuan is sent to the communication module in the induction loop portion by one of described adjustable delay chip to mention
Clock signal for reference.
Further, the power circuit in the present invention may include transformer TL, DC power supply, diode D1 ~ D4, crystal
Pipe T1-T2 and max666 and ICL type voltage conversion chip.The primary coil of transformer TL connects 220V alternating current, secondary coil
Both ends be separately connected two input terminals by diode D1 ~ D4 full-wave rectifying circuit constituted.The full-wave rectifying circuit
The input port Vin of positive output end connection max666 chip, and respectively through capacitor C2 connection GND, through described in capacitor C1 connection
The port LB1 of max666 chip.Positive output end of the emitter of transistor T1 through resistance R1 connection full-wave rectifying circuit, base stage
It is connect through resistance R3 with GND and the input port Vin through resistance R4 and R5 connection max666 chip, collector is connected through resistance R2
GND.The positive output end of the emitter connection full-wave rectifying circuit of transistor T2, base stage is through resistance R6 and max666 chip
The connection of the port LBO, collector is through resistance R10 connection GND.The port SHDN of max666 chip is through resistance R10 connection GND；It is described
The port Vout of max666 chip connects GND with R9 through resistance R7, R8.The positive voltage output end of power circuit is connected to resistance R7
Between R8, the DC voltage of output+5V, positive voltage output end is also connect through capacitor C3 with GND simultaneously.Max666 chip
The port Vset is connected between resistance R8 and R9.The positive voltage output end of the port the Vin connection power circuit of ICL cake core,
The DC voltage of the port Vout output -5V.The negative voltage output end of the power circuit is also connect through capacitor C5 with GND.ICL type
The port CAP+ of chip is connected with the port CAP- through capacitor C4.Further, the port Vin of max666 chip can also be through opening
Pass is connect with the DC power supply, and the switch is closed to be substituted and be supplied by DC power supply when alternating current outage situation is detected
Electricity.DC power supply can be the form of solar storage battery.
Further, communication loop wire according to the present invention can also include the control box for accommodating signal generation.Control
Box processed may include that the upper housing with top surface and four side walls, the buffer component on upper housing and upper housing cooperate
Lower case and the elastic component in lower case.Buffer component is solid by interference fit and the lower end of the side wall of upper housing
Fixed connection, and for being abutted against with elastic component between upper and lower casing.
Further, the side wall lower ends of upper housing, which are equipped with, compares thinner protruding portion.There are four be connected for buffer component tool
Side wall is to form hollow frame shape, and its side wall has the outside and inside connected by interconnecting piece, wherein external and internal
Between have opening with the protruding portion formed be interference fitted.It has extended inwardly to form from opening along buffer component top surface prominent
It rises, contacts when opening is formed with the protruding portion of upper housing and is interference fitted with lower case formation to fix buffer component.It is slow
Rush component also externally extend downwardly shape have protruding portion with for elastic component it is inconsistent.Lower case may include bottom surface and four
A side wall all has on each side wall in a snap-fit manner by the fixed groove type engaging portion being accommodated therein of elastic component.
Elastic component may include the planar portions having a first end and a second end, wherein extending from first end bending, there are three elastic slices, and
And further bent from the elastic slice and extend to form abutting portion, certain angle is formed between the abutting portion and the elastic slice.From
Outward bending has extended to form extension, overbending direction and elastic slice on the contrary, being inserted into lower case by extension at second end
Elastic component to be fixed in lower case in the corresponding jack of groove type engaging portion.When being closed the control box, elastic structure
The abutting portion of part and the protruding portion of upper housing buffer component contradict, to form tight seal.
Preferably, the elasticity for forming the material of the elastic component can be greater than the bullet for forming the material of the buffer component
Property.
Further, communication loop wire of the invention can also include control unit, and described control unit is configured to: working as inspection
When measuring electric car arrival apart from crossing first position, described control unit controls the vehicle-mounted communication module to central control room
The first instruction is issued, first instruction includes at least current location information and velocity information；The central control room is receiving
To after first instruction, determine whether electric car by crossing and issuing judgement according to the current location and velocity information
As a result；When detecting that electric car is reached apart from the crossing second position, the vehicle-mounted communication module receives the judging result, such as
Fruit judging result indicates that electric car can be by crossing, then described control unit control electric car keeps speed traveling；When detecting electricity
When vehicle is reached apart from crossing the third place, described control unit controls the vehicle-mounted communication module and sends out to the central control room
Show that crossing is in the second instruction of occupied state out, the central control room is instructed according to described second to traffic light control system
System issues the request for keeping green light phase；When detecting that electric car is reached by crossing apart from four position of crossing, the control
Unit, which controls the vehicle-mounted communication module and issues to the central control room, shows that crossing releases the third instruction occupied, described
Central control room is instructed according to the third issues the request for releasing green light hold mode to the traffic light control system.
Detailed description of the invention
Fig. 1 is the frame construction drawing of communication loop wire according to the present invention.
Fig. 2 is demodulator circuit schematic diagram according to the present invention.
Fig. 3 is frequency adjustment circuit schematic diagram according to the present invention.
Fig. 4 is numerical control analog switch module principle figure according to the present invention.
Fig. 5 diagrammatically illustrates power circuit principle figure according to the present invention.
Fig. 6 diagrammatically illustrates control box according to the present invention.
Fig. 7 diagrammatically illustrates the groove type engaging portion in the lower case of control box according to the present invention.
Specific embodiment
In train-ground communication, communication data is digital signal, and digital signal cannot directly pass through induction loop and transmitting-receiving day
Electromagnetic coupling effect between line is transmitted.It therefore, can be by above-mentioned electromagnetism coupling with the digital signal modulated that needs transmit
The sinusoidal signal (i.e. carrier signal) for closing action transport, when digital signal changes, by the width of its carrier signal modulated
Degree, phase or frequency may may also change accordingly.It is passed by the carrier signal of digital signal modulated by inductively acting on
It is defeated then the carrier signal is demodulated on induction loop or dual-mode antenna, it is extracted from carrier signal and needs to transmit
Digital signal, to complete the train-ground communication of digital signal.
Fig. 1 shows the frame structure of the communication loop wire for rail electric car, as shown in Figure 1, in the sense along track laying
Answer loop wire portion mainly and may include induction loop and communication module, vehicle-mounted signal transmitting and receiving portion mainly may include dual-mode antenna and
Communication module.In the present invention, the induction loop being layed on tramway can use the paving mode of X-shape, vehicle-mounted
Dual-mode antenna in signal transmitting and receiving portion can use single antenna structure, i.e. the antenna is used to send and receive communication number simultaneously
According to.Communication module mainly includes the other components such as modulation circuit, demodulator circuit and amplifier.
Modulation circuit in the present invention can mainly include single-chip microcontroller, reference clock source, digital controlled oscillator, phase-modulation
Device, look-up table block, digital analog converter and amplifying circuit.
Reference clock source is used to provide reference clock signal for the other component (such as digital controlled oscillator) adjusted in circuit.
Digital controlled oscillator mainly includes a phase accumulator, and single-chip microcontroller is phase-accumulated to control to digital controlled oscillator output control signal
The input value (i.e. phase step) of device.Phase-modulator is connect with digital controlled oscillator, is carried out for the output to digital controlled oscillator
Phase-modulation.Phase-modulator is exported to look-up table block, and in look-up table block, digital phase information is used as inquiry table
Address is inquired, therefore digital phase information can be converted by look-up table block by amplitude information (i.e. realization digit phase letter
Cease the mapping of amplitude information), to obtain the amplitude discrete value of corresponding sine waveform.It is obtained from look-up table block
Amplitude discrete value is input to digital analog converter, and corresponding analog sinus signals are obtained after digital-to-analogue conversion, to complete signal
Modulated process.
Since the analog signal of digital analog converter output is current signal, and hence it is also possible to which an amplifying circuit is arranged, use
In current analog signal is converted to voltage analog signal, while signal is amplified, to meet needed for induction loop communication
The intensity value wanted.Preferably, which can have adjustable gain characteristic.Specifically, the amplifying circuit can wrap
An operational amplifier U1 is included, current analog signal is input to operational amplifier U1 through a capacitance C1 by digital analog converter
Non-inverting input terminal；The inverting input terminal of operational amplifier is connect via an adjustable resistance with DC power supply, can by adjusting
The resistance value of resistance is adjusted to change the yield value of amplifying circuit, to realize the adjustable of gain amplifier.
Fig. 2 diagrammatically illustrates the schematic diagram of demodulator circuit according to the present invention.As shown in Fig. 2, demodulation electricity of the invention
Road can mainly include pressure limiting module, phase discriminator, loop filter, voltage controlled oscillator, amplifying circuit, clamp circuit and Schmidt
Trigger.
Since interference component can be introduced when input modulating signal from dual-mode antenna, in demodulator circuit of the invention
In, allow modulated signal through capacitance input pressure limiting module to be pre-processed first, pressure limiting module allows to pass through by default
Signal voltage amplitude range eliminate interference component, wherein described allow the voltage range passed through can be according to communicating requirement
And in communication system working environment electromagnetic noise situation and determine.In the present invention, pressure limiting module can be by diode and three
Pole pipe is realized, so that can also provide signal by the amplification characteristic of triode and put provide voltage restriction effect while
Big function.
In demodulator circuit, phase discriminator, loop filter and voltage controlled oscillator constitute a phase-locked loop structures to provide lock
Phase separation.In addition, phase discriminator can also carry out phase bit comparison, and the phase difference output phase based on the two to two signals of input
The phase potential difference answered.Loop filter can be made of resistance and capacitor, filter out the height from the phase potential difference that phase discriminator exports
Frequency and noise contribution.After being filtered, phase potential difference is amplified circuit and is further amplified, and is then split into two paths of signals,
Wherein signal is input directly into Schmidt trigger all the way, and another way signal is input to after then handling via clamp circuit
Schmidt trigger.When phase-locked loop structures are in the lock state, the another way difference voltage signal is handled through clamp circuit
Be formed as a stable reference voltage afterwards, and the reference voltage value is determined by two frequency values in 2FSK modulated signal.
An input end of the stable reference voltage formed through clamp circuit in Schmidt trigger, reference voltage as trigger
It uses.In Schmidt trigger, the above-mentioned difference electricity that another input terminal of Schmidt trigger is directly inputted into from amplifying circuit
Pressure is compared with the reference voltage formed through clamp circuit, exports high electricity from Schmidt trigger according to the size of phase potential difference
Flat or low level, and then realize the demodulation to 2FSK modulated signal.
Further, demodulator circuit of the invention can also include a frequency adjustment circuit, the frequency adjustment circuit with
The pierce circuit of voltage controlled oscillator is connected, and changes the center of voltage controlled oscillator by changing the capacitance of pierce circuit
Frequency, so that demodulator circuit of the invention can be adapted for a variety of different communication frequencys.As shown in figure 3, of the invention
Frequency adjustment circuit can be mainly made of 2 variable connectors and one group of capacitor, and be controlled by single-chip microcontroller.In the present embodiment,
Each variable connector may include 4 switches, and correspondingly capacitance group may include 4 different capacitors of capacitance, it is clear that multichannel
Number of switches and optional capacitance in switch can according to need and selected, to adapt to different frequency modulation demands.It is using
In, according to the communication frequency that communication system uses, single-chip microcontroller sends control instruction so that corresponding switch to frequency adjustment circuit
Conducting switches corresponding capacitor in the oscillating circuit of access voltage controlled oscillator to change its centre frequency, thus with being used
Communication frequency formed matching.
Due to using the structure of single dual-mode antenna in communication loop wire of the invention, that is, signal in signal transmitting and receiving portion
Sending and receiving will all complete by the same antenna, and therefore, the present invention is also provided with a numerical control mould in signal transmitting and receiving portion
Quasi- switch module, for realizing switching of the signal transmitting and receiving portion between signal sending mode and signal receiving modes.Such as Fig. 4 institute
Show, numerical control analog switch module may include 2 bilateral analog switch, each bilateral analog switch can have input terminal,
Output end and control terminal.The control terminal of each bilateral analog switch is connect with single-chip microcontroller, for receiving the control of single-chip microcontroller sending
Signal processed, to control being switched on or off for analog switch.One input terminal connection modulation electricity in bilateral analog switch
Road and output end connection dual-mode antenna circuit, to constitute signal of communication sendaisle；In bilateral analog switch another
Input terminal connects dual-mode antenna circuit and output end connects demodulator circuit, to constitute signal of communication receiving channel.
In communication loop wire of the invention, according to the power supply requirement of built-in circuit, also power circuit is improved, is made
Its+5V and -5V power supply signal for capableing of steadily outputting high quality.As shown in figure 5, power circuit of the invention mainly includes becoming
Depressor TL, DC standby power battery, full-wave rectifying circuit D1 ~ D4, transistor T1-T2 and max and ICL series core
Piece.The primary coil of transformer TL connects 220V alternating current, the both ends of secondary coil be separately connected be made of diode D1 ~ D4 it is complete
Two input terminals of wave rectification circuit.The input port Vin of the positive output end connection max666 chip of full-wave rectifying circuit, and
And respectively through capacitor C2 connection GND, the port LB1 through capacitor C1 connection max666 chip.The emitter of transistor T1 is through resistance
The positive output end of R1 connection full-wave rectifying circuit, base stage connect with GND through resistance R3 and through resistance R4 and R5 connection max666
The input port Vin of chip, collector is through resistance R2 connection GND.The emitter connection full-wave rectifying circuit of transistor T2 is just
To output end, base stage is connect through resistance R6 with the port LBO of max666 chip, and collector is through resistance R10 connection GND.max666
The port SHDN of chip is through resistance R10 connection GND.The port Vout of max666 chip connects GND with R9 through resistance R7, R8, electricity
The positive voltage output end of source circuit is connected between resistance R7 and R8, the DC voltage of output+5V, and positive voltage output end is gone back simultaneously
It is connect through capacitor C3 with GND.The port Vset of max666 chip is connected between resistance R8 and R9.The Vin of ICL7660 cake core
Port connects the positive voltage output end of power circuit, and the DC voltage of the port Vout output -5V constitutes the negative voltage of power circuit
Output end.The negative voltage output end of power circuit is also connect through capacitor C5 with GND, the port CAP+ and the port CAP- of chip IC L
It is connected through capacitor C4.In addition, the port Vin of max666 chip is also connect through switching with DC power supply battery, switch in alternating current
Closure when outage situation is detected, to be powered by DC power supply battery.Preferably, DC power supply battery can be adopted
Use solar storage battery.By power circuit of the invention, communicating loop wire not only can be directly electrically connected with city, simultaneously because standby
Urgent electricity consumption when alternating current power-off, the communication between effective guarantee vehicle ground are also assured with the setting of power supply.Of the invention
In power circuit, the setting of transistor T1, T2 and selection of chip module is particularly conducive to alternating current and backup DC power source is common
The structure of one power circuit, so that power circuit is capable of providing high stable using any power source
Property, low ripple power signal, and the power circuit has the characteristics that micro energy lose and high conversion efficiency, can significantly improve with standby
With System production time when power supply.
Further, in practical applications, electric car travelling route is usually longer, due to power limit, is layed in track
On single communication module can only often support the communication requirement in limited distance, therefore usually require to be arranged in orbit multiple
Communication module is completely communicated with meeting.Each communication module requires to work based on public reference clock signal, in existing skill
In art, reference clock source is individually equipped in each communication module.In the longer situation of route, need to set along orbit distribution
Set that quantity is very big and the identical reference clock source of output parameter, this will cause manufacture and follow-up maintenance higher cost.For this purpose, this
It can also include a common reference clock module in the communication loop wire of invention, which may include common reference clock
Source and several adjustable delay chips.The common reference clock module can be set in such as central control room, in use,
The output signal of common reference clock source is sent to respectively by each adjustable delay chip along each of orbit distribution setting
Communication module is to provide reference clock signal.By common reference clock module of the invention, can effectively guarantee to lead to everywhere
Believe the consistency of the reference clock signal of module, while to become more the adjustment and maintenance of reference clock signal everywhere
It is easy.
Fig. 6 and 7 diagrammatically illustrates according to the present invention for accommodating the electronic components such as communication module and power circuit
Control box.Due to control box be along track installation on the ground, thereon may be by bedding meadow or pitch etc., and electric car
Traveling can generate larger vibration when passing through, therefore sealing to the control box and anti-vibration effect have more strict requirements.
As shown, under control box may include upper housing, the buffer component on upper housing, cooperate with upper housing
Shell and the elastic component in lower case, wherein buffer component is used for and elasticity between upper housing and lower case
Component abuts against.
Upper housing has top surface and four side walls 111, and the lower end of each side wall 111 is equipped with protruding portion 112, is used for and buffering
Component forms interference fit connection.The thickness of the protruding portion 112 is less than the thickness of side wall.There are four connected sides for buffer component tool
Wall is to form hollow frame shape.The side wall of buffer component has the outside 121 and inside 123 connected by interconnecting piece 122.Outside
There is the opening 124 that interference fit connection is formed with protruding portion 112 between portion 121 and inside 123.From opening 124 along buffering structure
The top surface of part has extended inwardly to form protrusion 125, when the protruding portion 112 of be open 124 and upper housing, which is formed, to be interference fitted, protrusion
125 contact with lower case formation so that buffer component is fixed.Buffer component also externally 121 extends downwardly shape and has protruding portion 126
For inconsistent with elastic component.
Lower case includes bottom surface and four side walls.The groove type for accommodating elastic component is all had on each side wall to combine
Portion, the elastic component can be fixed in a snap-in manner and be contained in groove type engaging portion.
Elastic component has planar portions 131, and planar portions 131 have a first end and a second end.It is extended with from first end bending
Three elastic slices 132, from the elastic slice 132, further bending extends to form abutting portion 133, between the abutting portion 133 and the elastic slice 132
Shape is at an angle so that the abutting portion 133 is tilted relative to planar portions 131.From outward bending from the second end opposite with first end
Extend to form extension, the overbending direction of overbending direction and elastic slice is on the contrary, be buckled in lower case by extension insertion
Elastic component to be fixed in lower case in corresponding jack in groove type engaging portion.The elasticity of the elastic component is greater than slow
Rush the elasticity of component.When closure controls box body, the protruding portion of the buffer component of the abutting portion 133 and upper housing of elastic component
126 contradict, to form tight seal, while can provide preferable buffer function in the horizontal and vertical directions.
Further, it is also possible to accordingly formed on upper housing and lower case it is multiple through screw hole, to be bolted
Upper-lower casing is fixed together.
Further, due to inevitably there is intersection on tramline, in the present invention,
Also the control unit (such as single-chip microcontroller) of communication loop wire is improved, passes through efficiency to improve the crossing of tramcar.
In the present invention, which is configured to, and (such as is layed in when detecting that tramcar is reached apart from crossing first position
The first inductance loop line segment on ground) when, control unit controls vehicle-mounted communication module and issues at least to such as central control room
Whether the first instruction including current location information and velocity information, crossing can be passed through by asking for instructions；Central control room is receiving
After first instruction, determine whether that electric car is reached by the crossing, and in electric car according to electric car current location and velocity information
Judging result is issued to control unit when apart from the crossing second position (such as second inductance loop line segment being layed on ground)；Such as
The instruction of fruit judging result can be by crossing, then electric car continues to keep speed traveling, and reaches apart from crossing the third place (example
The third inductance loop line segment being such as layed on ground) when, control unit controls vehicle-mounted communication module and issues to central control room
Show crossing be in occupied state second instruction, central control room according to this second instruct to traffic light control system issue protect
Hold the request of green light phase；In electric car by reaching behind crossing apart from the 4th position of crossing (such as the 4th be layed on ground
Inductance loop line segment) when, control unit, which controls vehicle-mounted communication module and issues to central control room, shows that crossing releases the occupied
Three instructions, central control room is instructed according to the third issues the request for releasing green light hold mode to traffic light control system.It borrows
The control unit is helped, can guarantee that tramcar passes through crossing in the case where not parking as far as possible, it is logical to improve tramcar
Cross crossing efficiency.
Based on above-mentioned design, communication loop wire of the invention has more simple structure compared with prior art, has simultaneously
Higher system stability, at code rate and environmental suitability.In addition, communication loop wire of the invention also has more flexible adaptation
Property, being suitable for modularization uses, and is more suitable for industrial large-scale application.
Above-described embodiment is only to illustrate technical solution of the present invention by way of example, rather than its limitations.Although reference
Invention is explained in detail for previous embodiment, it will be appreciated by those persons skilled in the art that it still may be used
To modify to the technical solution that previous embodiment is recorded, or part of feature is equivalently replaced, and these are repaired
Change or equivalent replacement, the essence of corresponding technical solution is not made to be detached from the range of the technical solution of the embodiment of the present invention.
Claims (8)
1. a kind of communication loop wire comprising along the induction loop portion and vehicle-mounted signal transmitting and receiving portion of track laying, the inductance loop
Line portion includes induction loop and communication module, and the signal transmitting and receiving portion includes dual-mode antenna and communication module, the induction loop
For X-shape, the dual-mode antenna is single antenna, and the communication module includes 2FSK modulation circuit and 2FSK demodulator circuit；
It is characterized in that, the modulation circuit includes single-chip microcontroller, reference clock source, digital controlled oscillator, phase-modulator, inquiry table
Module, analog-digital converter and amplifying circuit；Wherein, the reference clock source is used to provide reference clock for the digital controlled oscillator
Signal；The digital controlled oscillator includes phase accumulator, and the single-chip microcontroller exports control signal to the digital controlled oscillator to control
Make the phase step of the phase accumulator；The phase-modulator carries out phase-modulation to the output of digital controlled oscillator, and defeated
Out to the look-up table block, phase information is converted by amplitude information by the look-up table block, to obtain sine wave
The amplitude discrete value of waveform；Analog-digital converter believes the amplitude discrete value conversion output analog sine electric current of the sine waveform
Number；
The amplifying circuit includes operational amplifier U1, the analog sine current signal conversion for being used to export analog-digital converter
For voltage analog signal and signal amplification is carried out, wherein the analog-digital converter is through capacitance C1 by analog sine current signal
It is input to the non-inverting input terminal of the operational amplifier U1；The inverting input terminal of the operational amplifier is via adjustable resistance and electricity
Source circuit connection, the resistance value by adjusting the adjustable resistance change the yield value of the amplifying circuit, to realize that amplification increases
Beneficial is adjustable；
The communication loop wire further includes the control box for accommodating the communication module and/or the power circuit；The control
Under box includes the upper housing with top surface and four side walls (111), the buffer component on upper housing, cooperates with upper housing
Shell and the elastic component in lower case, wherein the side wall that the buffer component passes through interference fit and upper housing
(111) lower end is fixedly connected, and for offseting with the elastic component between the upper housing and the lower case
It connects；Wherein, the lower end of the side wall (111) of the upper housing is equipped with protruding portion (112), and thickness is less than the side wall
(111) thickness；There are four connected side walls for buffer component tool to form hollow frame shape, the buffer component it is described
Side wall has the outside (121) and internal (123), the outside (121) and the inside connected by interconnecting piece (122)
(123) there is the opening (124) that interference fit connection is formed with the protruding portion (112) of the upper housing between；From described
Be open (124) along the top surface of the buffer component extended inwardly to form protrusion (125), when the opening (124) with it is described on
When the protruding portion (112) of shell forms interference fit, the protrusion (125) of the buffer component and the lower casing bodily form
At contact to fix buffer component；The buffer component also along the outside (121) extend downwardly shape have protruding portion (126) with
For inconsistent with elastic component；The lower case includes bottom surface and four side walls, is all had on each side wall for buckle
The elastic component is fixed the groove type engaging portion being accommodated therein by mode；
The elastic component has planar portions (131), and the planar portions (131) have a first end and a second end；
Extend from first end bending there are three elastic slice (132), from the elastic slice (132), further bending extends to form conflict
Portion (133) forms angle between the abutting portion (133) and the elastic slice (132) so that the abutting portion (133) are relative to institute
State planar portions (131) inclination；Extension is extended to form from outward bending from the second end opposite with the first end, it is described
The overbending direction of the overbending direction of extension and the elastic slice is on the contrary, be buckled in the lower case by extension insertion
The elastic component to be fixed in the lower case in the corresponding jack of the groove type engaging portion.
2. communication loop wire as described in claim 1, which is characterized in that the demodulator circuit includes pressure limiting module, phase discriminator, ring
Path filter, voltage controlled oscillator, amplifying circuit, clamp circuit and Schmidt trigger；The pressure limiting module include diode and
Triode, the received modulated signal of dual-mode antenna inputs the pressure limiting module through capacitance, thus output voltage amplitude
Allow in the pressure limiting module through the signal in range；The phase discriminator, the loop filter and the voltage controlled oscillator
Constitute phase-locked loop structures；The phase discriminator also carries out phase bit comparison to two signals of input, and the phase difference based on the two is defeated
Corresponding phase potential difference out；The loop filter is made of resistance and capacitor, filters out the difference electricity exported from the phase discriminator
High frequency and noise contribution in pressure；The phase potential difference is amplified after being filtered by the amplifying circuit, and is divided into two
Road signal, wherein signal is input directly into the Schmidt trigger all the way, and another way signal is then via the clamp electricity
The Schmidt trigger is input to after the processing of road；Wherein, described another when the phase-locked loop structures are in the lock state
Road differs voltage signal and is formed as the ginseng determined by two frequency values in the modulated signal after clamp circuit processing
Examine voltage.
3. communication loop wire as claimed in claim 2, which is characterized in that the demodulator circuit further comprises that frequency adjusts electricity
Road, for being connect with the voltage controlled oscillator to change the voltage controlled oscillation by the capacitance for changing the voltage controlled oscillator
The centre frequency of device, the frequency adjustment circuit are made of 2 variable connectors and one group of capacitor；Each variable connector includes 4
Switch, one group of capacitor include 4 different capacitors of capacitance, the on or off of the switch by the single-chip microcontroller into
Row control.
4. communication loop wire as claimed in claim 3, which is characterized in that the signal transmitting and receiving portion further comprises that numerical control simulation is opened
Module is closed, for realizing switching of the signal transmitting and receiving portion between signal sending mode and signal receiving modes；The numerical control
Analog switch module includes 2 bilateral analog switch, and each of described bilateral analog switch all has input, output end
And control terminal, the control terminal of the bilateral analog switch are connect to receive the control of single-chip microcontroller letter with the single-chip microcontroller
Number control being switched on or off for the bilateral analog switch, the input terminal of one of described bilateral analog switch connects the tune
Circuit processed and the output end connection dual-mode antenna, to constitute signal of communication sendaisle；In the bilateral analog switch
Another input terminal connects the dual-mode antenna and output end connects the demodulator circuit, leads to constitute signal of communication and receive
Road.
5. as claimed in claim 4 communication loop wire, which is characterized in that further comprise be set to it is public in central control room
Reference clock module, the common reference clock module include common reference clock source and several adjustable delay chips, described
The output signal of common reference clock source is sent to the communication in the induction loop portion by one of described adjustable delay chip
Module is to provide reference clock signal.
6. as claimed in claim 5 communication loop wire, which is characterized in that the power circuit include transformer TL, DC power supply,
Diode D1~D4, transistor T1-T2 and max666 and ICL type voltage conversion chip；Wherein, the primary of the transformer TL
Coil connects 220V alternating current, and the both ends of the secondary coil of the transformer TL, which are separately connected, to be made of the diode D1~D4
Two input terminals of full-wave rectifying circuit；The positive output end of the full-wave rectifying circuit connects the input of the max666 chip
Port Vin, and the port LB1 of the max666 chip is connected through capacitor C2 connection GND, through capacitor C1 respectively；The crystal
The emitter of pipe T1 connects the positive output end of the full-wave rectifying circuit through resistance R1, base stage connect through resistance R3 with GND and
The input port Vin of the max666 chip is connected with R5 through resistance R4, collector is through resistance R2 connection GND；The transistor
The emitter of T2 connects the positive output end of the full-wave rectifying circuit, LBO of the base stage through resistance R6 Yu the max666 chip
Port connection, collector is through resistance R10 connection GND；The port SHDN of the max666 chip is through resistance R10 connection GND；It is described
The port Vout of max666 chip connects GND with R9 through resistance R7, R8；The positive voltage output end of the power circuit is connected to institute
It states between resistance R7 and R8, the DC voltage of output+5V, the positive voltage output end is also connect through capacitor C3 with GND simultaneously；Institute
The port Vset for stating max666 chip is connected between the resistance R8 and R9；The port Vin of ICL cake core connects the power supply
The positive voltage output end of circuit, the DC voltage of the port Vout output -5V constitute the negative voltage output end of the power circuit；
The negative voltage output end of the power circuit is also connect through capacitor C5 with GND, the port CAP+ and the end CAP- of the ICL cake core
Mouth is connected through capacitor C4；
The port Vin of the max666 chip is also connect through switching with the DC power supply, and the switch is in alternating current outage situation
Closure by DC power supply when being detected to be powered.
7. communication loop wire as described in claim 1, wherein when being closed the control box, the described of the elastic component is supported
Contact portion (133) and the protruding portion (126) of the buffer component of the upper housing contradict, to be formed close close
Envelope.
8. further comprising control unit, described control unit quilt such as communication loop wire of any of claims 1-7
It is configured to:
When detecting that electric car is reached apart from crossing first position, described control unit controls the vehicle-mounted communication module in
Control room is entreated to issue the first instruction, first instruction includes at least current location information and velocity information；The center control
Room determines whether electric car by crossing simultaneously after receiving first instruction, according to the current location and velocity information
Issue judging result；
When detecting that electric car is reached apart from the crossing second position, the vehicle-mounted communication module receives the judging result, such as
Fruit judging result indicates that electric car can be by crossing, then described control unit control electric car keeps speed traveling；
When detecting that electric car is reached apart from crossing the third place, described control unit controls the vehicle-mounted communication module to institute
It states central control room and issues the second instruction for showing that crossing is in occupied state, the central control room is according to second instruction
The request for keeping green light phase is issued to traffic light control system；
When detecting that electric car is reached by crossing apart from four position of crossing, described control unit controls the vehicle-mounted communication
Module is issued to the central control room shows that crossing releases the third instruction occupied, and the central control room is according to the third
Instruct the request for issuing to the traffic light control system and releasing green light hold mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610090681.4A CN105721372B (en) | 2016-02-18 | 2016-02-18 | Communicate loop wire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610090681.4A CN105721372B (en) | 2016-02-18 | 2016-02-18 | Communicate loop wire |
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| CN105721372A CN105721372A (en) | 2016-06-29 |
| CN105721372B true CN105721372B (en) | 2019-04-12 |
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| CN107856701B (en) * | 2017-09-11 | 2020-06-16 | 浙江众合科技股份有限公司 | Locomotive loop line sending signal simulation device and method thereof |
| CN108945005A (en) * | 2018-04-12 | 2018-12-07 | 浙江众合科技股份有限公司 | Cross talk loop wire and CBTC control system |
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| JP2003240570A (en) * | 2002-02-21 | 2003-08-27 | Seiko Epson Corp | Detector for moving direction |
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