CN106940937A - The wave communication of public bus network half and the information display system that arrives at a station - Google Patents

The wave communication of public bus network half and the information display system that arrives at a station Download PDF

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Publication number
CN106940937A
CN106940937A CN201710162568.7A CN201710162568A CN106940937A CN 106940937 A CN106940937 A CN 106940937A CN 201710162568 A CN201710162568 A CN 201710162568A CN 106940937 A CN106940937 A CN 106940937A
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bus
station
module
controller
cycle
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张金木
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Fuzhou Taijiang Chaoren Electronic Co Ltd
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Fuzhou Taijiang Chaoren Electronic Co Ltd
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/123—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams
    • G08G1/133—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams within the vehicle ; Indicators inside the vehicles or at stops
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/12—Messaging; Mailboxes; Announcements
    • H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Health & Medical Sciences (AREA)
  • Computing Systems (AREA)
  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Each bus station constitutes bus arrival information query system, serial ports WiFi module transmission information is used between bus station and bus, public bus network realizes that information is exchanged between each bus station using the wave communication of power line half, when distance is longer between two bus stations using transmitting-receiving short message mode communication, the network port that passenger can log in computer using mobile phone A PP obtains each road bus arrival information.

Description

The wave communication of public bus network half and the information display system that arrives at a station
(1) technical field：
Each bus station constitutes bus arrival information query system, and serial ports Wi- is used between bus station and bus Fi module transmission informations, public bus network realizes that information is exchanged between each bus station using the wave communication of power line half, when two bus stations Between distance it is longer when using transmitting-receiving short message mode communication, passenger can using mobile phone A PP log in computer the network port obtain Each road bus arrival information.
(2) background technology：
With flourishing for public transport cause, increasing people starts the trip that takes bus, urban public bus lines with The development for public transport cause rapidly increases, therefore road is also more and more crowded, and the time of passenger's waiting by bus becomes very uncertain, The crowded passenger on public transport having of bus caused but seldom, because crowded bus number many times of getting on or off the bus are long, Each station is required for stopping the longer time, if passenger can know that each circuit bus arrival information, avoiding congestion circuit can To alleviate public bus network jam situation to a certain extent, ridden while being also convenient for passenger.
The existing intelligent bus stop board system based on GPS global locations, the extension GPS functions of being provided by the system are right Public transit vehicle carries out real-time satellite positioning, although can grasp the letter such as the current position of public transit vehicle, travel speed, direction in real time Breath, but the system architecture complex and expensive very flexible based on GPS global locations, and many high buildings and large mansions in city, some areas Satellite-signal is not smooth, therefore influence popularization, and only super-large city just has on probation at present.
(3) content of the invention：
The system is provided with the master controller of bus station in public transport terminus, and each bus station is provided with public transport stand control Device, master controller passes through power line half-wave constructing communication network with each public transport station control.Each bus is provided with Vehicle Controller Exchanged for carrying out wireless communication information with public transport station control, the simple cheap signal stabilization of system architecture is good.
The cycle discriminator circuit structural representation of master controller and each public transport station control is as shown in Fig. 2 by two uses The voltage comparator composition of hysteresis loop comparator, two comparators are separately positioned on the positive half cycle descending branch of cycle, crest voltage 60% to 80% place is as the place of point 1 and 30% to 45% is screened as point 2 is screened, and the positive half cycle descending branch of cycle is close to communication disruption At INT1 breakpoint, screen point and be arranged near communication disruption INT1 breakpoint, filtered off most of interference, and make communication in week The position that ripple bears half-wave is more accurate.Include filter circuit in each voltage comparator, the reference voltage of its voltage comparator by Mu balanced circuit is provided, and comparator input terminal is followed by from electric power netting twine through signal condition, resistance step-down, partial pressure, voltage stabilizing.
As shown in figure 1, at cycle zero passage, that is, screening point 0 and setting voltage zero-cross detection module, it uses cycle positive half-wave Signal sends into the clock end CLK of d type flip flop, D triggerings after further isolating negative half period, signal condition through electric resistance partial pressure, diode Q termination single-chip microcomputers the external interrupt mouthful INT0, the external interrupt mouthful INT0 of device are arranged to level triggers, the D terminations of d type flip flop Ground, S termination single-chip processor i/os mouthful, usually puts 1 for the I/O mouthfuls.When cycle positive half-wave signal arrives, on CLK signal immediately after Rising edge makes d type flip flop Q ends be 0, single-chip microcomputer external interrupt mouthful INT0 low levels, so as to produce interruption, the break period is T0, from T0 Place starts timing, is delayed through 5MS, and the output voltage of electricity pressure comparator ﹙ V1 ﹚ at point T1 is screened in single-chip microcomputer scanning, when all wave voltages During Da Dao ﹙ V1 ﹚ threshold voltage, output voltage produces saltus step, and scanning records timing time t1 during its saltus step；Same scanning note The electric time t2 for pressing comparator ﹙ V2 ﹚ output voltage saltus steps in point T2 place is screened in record, by t1, t2 saltus step corresponding with t1, t2 respectively Time setting value Ts1, Ts2 is made comparisons；If in the range of allowable error, the cycle signal detected be it is true, otherwise for It is false.For the fictitious time Central Shanxi Plain break INT1, perform interrupt return, when for it is true when d type flip flop set to 0, execute instruction：Open interrupt INT 1, it is described I/O mouthfuls set to 0, the Central Shanxi Plain break INT0, described I/O mouthfuls put 1.
Lock in time uses the product multiplied to the stored count value N of grid cyclic wave and the average time T-phase of one cycle of power network, Along with the clocking value Ts between timing time point ti and grid cyclic wave integer value obtains lock in time TZ, its grid cyclic wave it is flat The equal time is to take it to be averagely worth to the measured value of 100 grid cyclic wave times in grid cyclic wave counting process
System is the lock in time communication in agreement.It is each in the telecommunication circuit of each station control and main controller to install one Communications electronics switch, switch drive module.The switch drive module of communications electronics switch is to be depressured, believe through resistance from electric power netting twine Number conditioning and the anti-phase CLK ends for being followed by d type flip flop A, the external interrupt mouthful INT1 of d type flip flop A Q termination single-chip microcomputers, the interruption Mouth is set to level triggers.D type flip flop A D ends ground connection, its S end connects with the I/O mouths of single-chip microcomputer, and original state S puts 1 in end.When When the positive square-wave signal at CLK ends arrives, its rising edge makes d type flip flop set to 0 middle fracture INT1 low levels generation interruption, is interrupting clothes First it is followed by believing electronic switch all through 0.5MS delays in business program, starts timing, and set to 0 S ends, d type flip flop puts 1 i.e. Q ends and is 1 and the Central Shanxi Plain break INT1, then communicated, communications electronics switch be connected to single-chip microcomputer corresponding port according to used communication mode, and The sign off of this cycle within signal condition, timing 9MS is carried out, shut-off communications electronics are switched, and S, which puts at end 1, makes out interruption etc. The communication of next cycle is treated, so goes round and begins again and realizes half wave communication.Main controller is sent out to each station control during this sign off Send shut-off communications electronics switch, the disconnected INT1 in Central Shanxi Plain instruction.
The signal source of bus distance travelled is the kilometer sensor on speed changer or hub for vehicle wheel, to mileage Table sensor output pulse signal, which is counted, can reflect wheel revolutions, obtain speed and distance travelled information, mileometer sensing Device output signal through level shifting circuit, low-pass filter circuit it is anti-interference after output signal is accurately caught by one-chip machine port Identification, is re-fed into one-chip machine port.Mileage between the preset each station of the Vehicle Controller of each circuit bus, to be travelled Middle position.When bus communicates with bus station, when the Vehicle Controller of bus is calculated when setting is arrived at a station, mileage is subtracted between two stations When the error amount of mileage is between+8 meters and -5 meters between two stations when actual measurement is arrived at a station, the bus do not stopped before expression, The bus is to be stopped to station location, then the error amount is marked M, and the Vehicle Controller of bus arrives each time that indicates M Stand mileage error amount, take and leave out maximum for several times by setting ratio number of times more than 5 times and arrive at a station mileage error amount, remaining work of averaging For offset, mileage is measured for correcting.The time interval of the setting need to ensure while the bus arrived at a station all leaves, and make Next bus is stopped to station location.
Ubiquitous Wi-Fi connection is promoted using the fast-developing radio infrastructures of Wi-Fi, makes Wi-Fi embedded Constantly reduced using the continuous performance continuous improvement cost that increases.Bus and bus station are respectively mounted serial ports Wi-Fi module, bus Vehicle Controller and public transport station control in serial ports Wi-Fi module, be the Wi-Fi module of embedded ICP/IP protocol.Its is hard Part is constituted mainly to be made up of embedded a single-chip microcomputer and Wi-Fi module, serial ports Wi-Fi module externally provide UART serial ports or Person's SPI interface, thus can be connected by serial ports and single-chip microcomputer.The Vehicle Controller of each bus and public transport station control it Between, radio communication is carried out by serial ports Wi-Fi module.
Serial ports Wi-Fi module between the Vehicle Controller of bus, bus station in controller and public transport station control is selected RN171 between Microchip RN171, bus station in controller by UART interface directly with SMS R-T unit Microcontroller be connected, other Wi-Fi modules can also be selected.Integrated complete ICP/IP protocol on RN171 module pieces, without External drive, RN171 modules can enter Low-power-consumptiodormancy dormancy and energy automatically scanning and connection AP, therefore be a high integration Super low-power consumption Wi-Fi module, it is adaptable to battery powered equipment.Module works in 2.4G frequency ranges, and acp chip is integrated with 32 Processor, transmission power can be adjusted by software, and support external antenna.The RN171 modules of Vehicle Controller use external day Line is to increase communication distance.
Each bus station constitutes bus arrival information query system, and each public transport station control is according to the station bus Line Address cycles through detection signal, realizes that information is handed over bus station after the Vehicle Controller response of the bus for parking of arriving at a station Change, when arriving at a station to channel transmission answer signal with many buses of circuit simultaneously, public transport station control will continuously receive several Wrong data bag or the intensity listened to after channel signals superposition transfinite, and illustrate that present channel is interfered, at this moment, each bus By between its parking spot and site location apart from S, by bus travel direction, since being exceeded 6 meters of site location forward, from It is dynamic, backward to 18-60 meters of point leaving from station, to fall into described Serial Number Range to number by S values according to every 6 meters of range incrementation numberings, on Note generally there was only 2 to 3 cars while arriving at a station when stating setting.Public transport station control is compiled to the bus disturbing line that arrives at a station according to described Number order retransmits detection signal, to the bus communicated not successfully if producing interference again, reduces described every 6 meters of scopes Value does not repeat to number again, repeats said process to interference is not produced, it fails when numbering to the next stop.When circuit possesses public transport The preset numbering that will not be failed using fixation during car negligible amounts.
Bus station communicates with bus also to be set using the different communication Channel cyclical of neighbor stations, uplink and downlink Road site communication channel of the same name, which staggers, to be used, and prevents co-channel interference.Bus is automatic after reaching terminal to change communication letter Road and website order are set, and public transport station control, which will arrive at a station, send display to show after information processing, be easy to passenger to check.
When bus station of the distance more than 700 meters between two stations, SMS R-T unit is installed, using receiving/sending mobile-phone short messages Mode is communicated, in bus travel direction, and public transport information of arriving at a station is passed to front by the bus station being located behind with short message mode Bus station, front bus station keeps reception state.SMS R-T unit include gsm module, SIM card, microcontroller and Eeprom memory, is controlled using microcontroller to gsm module, realizes that remote data is wirelessly transferred in SMS messaging mode. The serial port of microcontroller is directly connected with gsm module, completes the initialization to gsm module, realizes the transmission-receiving function of short message, EEPRAM memories are used for storing the coding and decoding of user data and short message.In addition, microcontroller also passes through extended serial port and institute Belong to the connection of public transport station control and carry out data exchange.Public transport terminus set main controller by coupled computer with Internet is connected.
(4) illustrate：
Fig. 1 is cycle discriminator circuit principle schematic；
Fig. 2 is the circuit structure block diagram of the wave communication of public bus network half and the information display system that arrives at a station.
(5) embodiment：
The circuit structure block diagram of the wave communication of public bus network half and the information display system that arrives at a station is as shown in Figure 2, comprising:
Controller (3), SMS R-T unit between master controller (1), the Vehicle Controller (2) of bus, bus station (4), public transport station control (5)；Wherein Vehicle Controller (2) is made up of serial ports Wi-Fi module and kilometer sensor, serial ports Wi-Fi module uses RN171 modules, and kilometer sensor output signal is sent into through level shifting circuit, low-pass filter circuit The I/O ports of single-chip microcomputer in RN171 modules.
Between master controller (1), bus station controller (3) and public transport station control (5) by radio communication serial ports Wi-Fi Module, cycle discriminator circuit, communications electronics switch, switch drive module and LCD display are constituted, and wherein master controller (1) leads to Cross coupled computer and be connected to Internet.Serial ports Wi-Fi module use RN171 modules, wherein LCD display with The I/O mouths of single-chip microcomputer are connected in RN171, and the information of arriving at a station of bus is stored in RN171 module storages.
Cycle discriminator circuit is made up of input circuit, voltage zero-cross detection module and voltage comparator.Input circuit is used for By partial pressure of the mains AC voltage by resistance and diode, voltage comparator suitably stable input voltage is converted to. Voltage zero-cross detection module d type flip flop, voltage comparator uses LM393, and its reference voltage is using the stable electricity of mu balanced circuit Press the threshold voltage of comparator.
Communications electronics switch uses reverse-blocking tetrode thyristor, and switch drive module includes input circuit and d type flip flop, the master control Single-chip microcomputer between device (1) processed, bus station in controller (3) and public transport station control (5) in serial ports RN171 modules also controls communication Electronic switch, switch drive module and cycle discriminator circuit.
SMS R-T unit (4) is made up of gsm module, SIM card, microcontroller, eeprom memory, wherein GSM Module uses AT24C32 using chip TC35i, microcontroller using 89C51, eeprom memory.89C51 is by extending I2C Bus is connected progress data exchange with affiliated public transport station control, and TC35i is RS232 data ports, and 89C51 passes through serial line interface electricity Flat turn is changed circuit chip MAX232 and is connected with TC35i.TC35i integrates radio circuit and base band, is data, voice, short disappears Breath and fax provide quick, reliable, safe transmission.TC35i has 40 pins, is divided into 5 classes, i.e. power supply, data input/defeated Go out, SIM card, COBBAIF and control.RN171 modules between bus station in controller (3) by UART interface directly and mobile phone Microcontroller 89C51 in short message transceiving device (4) is connected, i.e., RN171 modules TX pin are connected to the RX pin of microcontroller, RN171 Module RX pin are connected to the TX pin of microcontroller.
TC35i supports AT Command Set, wherein containing the control to SMS, microcontroller to TC35i by sending a series of AT is instructed, and completes the initialization to gsm module and receiving short message.The SIM card of gsm module is connected to, must be first on mobile phone to SIM The necessary setting of card progress, which enables and sets Short Message Center's service number, to be made it possible to and the short message in GSM nets (6) Center is contacted, therefore need not carry out similar setting again in use.Because only transceiving data, the system SMS transmitting-receiving is used TEXT patterns, TEXT patterns are a kind of tactic patterns based on ASCII character.

Claims (2)

1. the wave communication of public bus network half and the information display system that arrives at a station, it is characterized in that public transport terminus sets master controller, each public affairs Hand over station that public transport station control is set, master controller passes through the wave communication of power line half, each bus peace with each public transport station control Entrucking set controller is used to carry out radio communication with public transport station control；
The cycle discriminator circuit of master controller and each public transport station control is made up of two voltage comparators, two comparator difference The positive half cycle descending branch of cycle is arranged on, 60% to 80% place of crest voltage is used as Zhen as the place of point 1 and 30% to 45% is screened Other point 2, the positive half cycle descending branch of cycle is screened point and is arranged near the breakpoint of communication disruption, filter close at the breakpoint of communication disruption Most of interference has been gone, has made communication more accurate in the position that cycle bears half-wave；
At cycle zero passage, that is, screen point 0 and voltage zero-cross detection module is set, the defeated of point voltage comparator is screened in single-chip microcomputer scanning Go out voltage, if timing time when recording its saltus step is in the range of allowable error, the cycle signal detected is true；
Lock in time uses the product multiplied to the stored count value N of grid cyclic wave and the average time T-phase of one cycle of power network, then adds Clocking value Ts between upper timing time point ti and grid cyclic wave integer value obtains lock in time TZ, the mean time of its grid cyclic wave Between be to take it to be averagely worth to the measured value of 100 grid cyclic wave times in grid cyclic wave counting process；
System is communicated in the lock in time of agreement, and a communications electronics are respectively installed in the telecommunication circuit of each station control and main controller Switch, switch drive module, the negative half-wave anti-phase rear square-wave signal of grid cyclic wave are followed by believing electricity all when arriving through 0.5MS delays After sub switch, connection within timing 9MS this cycle sign off, shut-off communications electronics switch waits the logical of next cycle Letter, so goes round and begins again and realizes half wave communication, and main controller sends shut-off communications electronics switch to each station control during sign off Instruction；
The signal source of bus distance travelled is the kilometer sensor on speed changer or hub for vehicle wheel, mileometer sensing Device output signal through level shifting circuit, low-pass filter circuit it is anti-interference after send into microcontroller ports, the vehicle-mounted control of bus Mileage between the preset each station of device processed, with position in being travelled；It is vehicle-mounted when bus when bus communicates with bus station When controller calculates mileage between two stations of setting and subtracts the error amount of mileage between the actual station of measurement two between+8 meters and -5 meters, expression The bus do not stopped above, the bus is to be stopped to station location, then the error amount is marked M, bus it is vehicle-mounted Each time that the indicates M mileage error amount that arrives at a station is taken and leaves out maximum for several times by setting ratio number of times more than 5 times and arrive at a station mileage by controller Error amount, remaining is averaged as offset, for correcting measurement mileage；The time interval of the setting need to ensure while arriving The bus stood all leaves, and next bus is stopped to station location；
Bus and bus station are respectively mounted the string in serial ports Wi-Fi module, the Vehicle Controller and public transport station control of bus Mouth Wi-Fi module, from RN171, it is the Wi-Fi module of embedded ICP/IP protocol, suitable for battery powered equipment, or From other Wi-Fi modules, between each Vehicle Controller and public transport station control, channel radio is carried out by serial ports Wi-Fi module RN171 between letter, bus station in controller is directly connected by UART interface with the microcontroller in SMS R-T unit；
Each bus station constitutes bus arrival information query system, circuit of each public transport station control according to the station bus Address cycle sends detection signal, realizes that information is exchanged with bus station after the Vehicle Controller response of the bus for parking of arriving at a station, When arriving at a station to channel transmission answer signal with many buses of circuit simultaneously, public transport station control will continuously receive several mistakes Packet or the intensity listened to after channel signals superposition transfinite, and illustrate that present channel is interfered, and at this moment, each bus presses it Apart from S between parking spot and site location, by bus travel direction, since being exceeded 6 meters of site location forward, automatically according to Every 6 meters of range incrementation numberings backward to 18-60 meters of point leaving from station, fall into described Serial Number Range to number by S values, bus station Controller retransmits detection signal to the bus disturbing line that arrives at a station according to the number order, to failed if producing interference again The bus of communication, reduces the value every 6 meters of scopes and does not repeat to number again, repeats said process to not producing interference, It fails when numbering to the next stop；
Bus station communicates with bus also to be set using the different communication Channel cyclical of neighbor stations, and uplink is same with downgoing line Name site communication channel, which staggers, to be used, and prevents co-channel interference；Bus after reaching terminal it is automatic change communication channel and Website order is set, and public transport station control, which will arrive at a station, send display to show after information processing, be easy to passenger to check；
When distance is more than 700 meters between two bus stations, SMS R-T unit is installed, it is logical using receiving/sending mobile-phone short messages mode Letter, in bus travel direction, bus arrival information is passed to front by the bus station's timing being located behind with short message mode Bus station, in order to save the telephone number quantity that each SMS R-T unit is used, tdm communication is carried out by bus station's order, SMS R-T unit includes gsm module, SIM card, microprocessor and eeprom memory, using microprocessor to GSM moulds Block is controlled, and realizes that remote data is wirelessly transferred in SMS messaging mode.
2. the wave communication of public bus network half according to claim 1 and the information display system that arrives at a station, it is characterised in that include:
Controller (3) between master controller (1), the Vehicle Controller (2) of bus, bus station, SMS R-T unit (4), Public transport station control (5)；Wherein Vehicle Controller (2) is made up of serial ports Wi-Fi module and kilometer sensor, serial ports Wi-Fi Module uses RN171 modules, and kilometer sensor output signal sends into RN171 moulds through level shifting circuit, low-pass filter circuit The I/O ports of single-chip microcomputer in block；
Between master controller (1), bus station controller (3) and public transport station control (5) by radio communication serial ports Wi-Fi moulds Block, cycle discriminator circuit, communications electronics switch, switch drive module and LCD display are constituted, and wherein master controller (1) passes through Coupled computer is connected to Internet；Serial ports Wi-Fi module use RN171 modules, wherein LCD display with The I/O mouths of single-chip microcomputer are connected in RN171, and the information of arriving at a station of bus is stored in RN171 module storages；
Cycle discriminator circuit is made up of input circuit, voltage zero-cross detection module and voltage comparator；Input circuit is used for electricity Power net alternating voltage is converted to voltage comparator suitably stable input voltage by the partial pressure of resistance and diode；Voltage Zero passage detection module d type flip flop, voltage comparator uses LM393, and its reference voltage uses mu balanced circuit burning voltage ratio Compared with the threshold voltage of device；
Communications electronics switch uses reverse-blocking tetrode thyristor, and switch drive module includes input circuit and d type flip flop, the master controller (1), the single-chip microcomputer between bus station in controller (3) and public transport station control (5) in serial ports RN171 modules also controls communications electronics Switch, switch drive module and cycle discriminator circuit；
SMS R-T unit (4) is made up of gsm module, SIM card, microcontroller, eeprom memory, wherein gsm module AT24C32 is used using 89C51, eeprom memory using chip TC35i, microcontroller；89C51 is by extending I2C buses Be connected with affiliated public transport station control progress data exchange, 89C51 by serial line interface level shifting circuit chip MAX232 with TC35i connections.
CN201710162568.7A 2017-03-18 2017-03-18 The wave communication of public bus network half and the information display system that arrives at a station Pending CN106940937A (en)

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CN102737503A (en) * 2012-06-20 2012-10-17 东南大学 Communication connectivity analysis method for bus dynamic scheduling under internet of vehicles environment
KR20140129402A (en) * 2013-04-23 2014-11-07 주식회사 이고 Bus Information Terminal With Regeneration Capability
CN106094620A (en) * 2016-06-20 2016-11-09 福州台江区超人电子有限公司 Remote analog amount gathers warning system

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Application publication date: 20170711