CN106920420A - The wave communication of public bus network half and the information intelligent display board that arrives at a station - Google Patents

Abstract

The wave communication of public bus network half and the information intelligent display board that arrives at a station are used the present invention relates to one kind, each of which bus station constitutes bus arrival information query system, nRF905 radio-frequency communication module transmission informations are used between bus station and bus, public bus network realizes that information is exchanged between each bus station using the wave communication of power circuit half, when distance is more long between two bus stations using transmitting-receiving short message mode communication, passenger can utilize the network port that mobile phone A PP logs in computer to obtain each road bus arrival information.

Description

The wave communication of public bus network half and the information intelligent display board that arrives at a station

(1) technical field:

Each bus station constitutes bus arrival information query system, is penetrated from nRF905 between bus station and bus Frequency communication module transmission information, public bus network realizes that information is exchanged between each bus station using the wave communication of power circuit half, when two Using transmitting-receiving short message mode communication when distance is more long between bus station, passenger can utilize mobile phone A PP to log in the network-side of computer Mouth obtains 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 passenger's waiting time by bus becomes very uncertain, The crowded passenger on public transport having of bus for causing 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, while be also convenient for passenger riding.

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 the letter such as the current position of public transit vehicle, travel speed, direction can be grasped 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 as shown in Figure 2, is used by two The voltage comparator composition of hysteresis loop comparator, two comparators are separately positioned on the positive half cycle descending branch of cycle, crest voltage Used as the place of point 1 and 30% to 45% is screened as point 2 is screened, the positive half cycle descending branch of cycle is close to communication disruption at 60% to 80% place At the breakpoint of INT1, screen point and be arranged near the breakpoint of communication disruption INT1, filter off most of interference, and make communication in week The position of the negative half-wave of ripple 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 through signal condition, resistance step-down, partial pressure, voltage stabilizing from electric power netting twine.

As shown in Figure 1, at cycle zero passage, that is, screen point 0 and voltage zero-cross detection module is set, 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, and through 5MS time delays, the output voltage of electricity pressure comparator ﹙ V1 ﹚ at point T1 is screened in single-chip microcomputer scanning, when all wave voltages During the threshold voltage of Da Dao ﹙ V1 ﹚, output voltage produces saltus step, scanning to record timing time t1 during its saltus step；Same scanning note The time t2 of electricity pressure comparator ﹙ V2 ﹚ output voltage saltus steps at point T2 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 for detecting be it is true, otherwise for It is false.Be the disconnected INT1 in the fictitious time Central Shanxi Plain, perform to interrupt and return, when for it is true when d type flip flop set to 0, execute instruction:Open interrupt INT 1, described I/O mouthfuls set to 0, the disconnected INT0 in the Central Shanxi Plain, 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 that the measured value of 100 grid cyclic wave times is taken into it in grid cyclic wave counting process to be averagely worth to.

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 through resistance step-down, letter 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 the Q termination single-chip microcomputers of d type flip flop A, the interruption Mouth is set to level triggers.The D ends ground connection of d type flip flop A, its S end connects with I/O mouthfuls 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 taken interrupting First it is followed by through 0.5MS time delays believing electronic switch all 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 disconnected INT1 in the Central Shanxi Plain, then communicated, communications electronics switch according to single-chip microcomputer corresponding port is connected to using communication mode, and Signal condition is carried out, the sign off of this cycle within timing 9MS, shut-off communications electronics switch, S puts at end 1 makes out interruption etc. The communication of next cycle is treated, is so gone round and begun again and is realized half wave communication.Main controller is sent out to each station control during this sign off Shut-off communications electronics are sent to switch, the instruction of the disconnected INT1 in the Central Shanxi Plain.

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 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 microcontroller ports Identification is caught, microcontroller ports are re-fed into.Mileage between the Vehicle Controller of each circuit bus preset each station, to obtain Position in traveling.When bus communicates with bus station, if public transport station control does not have bus in the time interval of setting Arrive at a station, when being communicated with first bus for arriving at a station afterwards, marking signal M is sent in addition, the Vehicle Controller of bus will be marked The actual measurement mileage that arrives at a station for having M compares calculating and arrives at a station mileage error with setting mileage, takes the mileage error of arriving at a station of more than 5 times Value, is left out by setting ratio number of times and is up to station error for several times, and remaining is averaged as offset, for correcting in measurement Journey.The time interval of the setting need to ensure while the bus for arriving at a station all leaves, and the next bus that arrives at a station is arrived at a station Stop position.Its speed of some vehicles is exported with mileage signal using bus signals, then by its vehicle speed mileage data transmission unit Obtain speed, mileage.

Radio communication is used between bus and bus station, radio communication is by radio-frequency module, microcontroller and non-volatile deposits Reservoir is constituted, and microcontroller here selects C8051F330 chips, radio-frequency module to select nRF905 for convenience of description. NRF905 utilizes SPI mouthfuls of both-way communication, microcontroller C8051F330 to be communicated with nRF905 by its SPI interface, public transport car kilometer Output signal is connected to I/O mouthfuls of C8051F330, is stored in nonvolatile storage after being read by C8051F330, Vehicle Controller Communication data be also stored in nonvolatile storage.

NRF905 data receivers:Microprocessor control TRX_CE is high level, TX_EN is low level, and nRF905 entrance connects Receipts pattern；After 650us, nRF905 monitors aerial information, waits data to be received；When nRF905 detect it is identical with receives frequency Carrier wave when, it is high level to set carrier wave detection pin CD；When nRF905 receives effective address, matching pipe in address is set Pin AM is high level；After a correct packet is received, nRF905 remove automatically the prefix of packet, address and CRC check code, is then set to high level by data receiver completion pin；TRX_CE is set to low level and passed through by microcontroller SPI interface is with the effective reception data in certain Rate extraction packet；When all of valid data are received, microcontroller It is low level that device controls nRF905 data receivers to complete pin DR and address matching pin AM；NRF905 enters standby mode.Connect Receipts process major cycle is constantly in listening state, recursive call receiver function.If receiving packet, response bag is sent.

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 of parking of arriving at a station Change, arrived at a station simultaneously during to channel transmission answer signal with many buses of circuit, 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 6 meters of site location is exceeded forward, from It is dynamic, backward to 18-60 meters of point leaving from station, to fall into described Serial Number Range by S values to number 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 to the bus disturbing line that arrives at a station according to the volume Number order retransmits detection signal, as produced interference again if to the bus of failed communication, reduce described every 6 meters of scopes Value does not repeat to number again, repeats said process to interference is not produced, and its numbering fails to during the next stop.When circuit possesses public transport The preset numbering that will not be failed using fixation during car negligible amounts.

The different communication Channel cyclical setting that bus station communicates using neighbor stations with bus, uplink and downgoing line Site communication channel of the same name staggers and uses, and prevents co-channel interference.Bus is automatic after reaching terminal to change communication channel Set with website order, public transport station control 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 communicates, and in bus travel direction, the bus station's timing being located behind passes to public transport information of arriving at a station with short message mode Front bus station.SMS R-T unit includes gsm module, SIM, microprocessor and eeprom memory, using micro- place Reason device is controlled to gsm module, realizes that remote data is wirelessly transferred in SMS messaging mode.The serial port and GSM of microprocessor Module is directly connected, and completes the initialization to gsm module, realizes the transmission-receiving function of short message, and EEPRAM memories are used for storing The coding and decoding of user data and short message.In addition, microprocessor also by extended serial port be connected with affiliated public transport station control into Row data exchange.

The main controller that public transport terminus is set is connected by coupled computer and Internet, and passenger can profit The network port for logging in the computer with mobile phone A PP obtains the number in the bus arrival information of supervising software Zhong Ge roads According to.

(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 intelligent display board that arrives at a station.

(5) specific embodiment:

The wave communication of public bus network half is as shown in Figure 2 with the circuit structure block diagram of the information intelligent display board that arrives at a station, comprising:

Controller (3), SMS R-T unit between master controller (1), Vehicle Controller (2), the bus station of bus (4), public transport station control (5)；Wherein Vehicle Controller (2) is made up of radio-frequency communication module and kilometer sensor, and radio frequency leads to Letter module is made up of radio-frequency module nRF905, microcontroller C8051F330 and nonvolatile storage AT24C32, radio-frequency module NRF905 is communicated by SPI interface with microcontroller C8051F330, other function pins of nRF905 and the I/O of C8051F330 Mouth is connected, and C8051F330 is communicated by I2C bus modes with AT24C32.

Controller (3) and public transport station control (5) screen electricity by radio-frequency module, cycle between master controller (1), bus station Road, communications electronics switch, switch drive module and LCD display are constituted, and wherein master controller (1) is by coupled calculating Machine is connected to Internet.Radio-frequency module is by radio-frequency module nRF905, microcontroller C8051F330 and nonvolatile storage AT24C64 is constituted, and wherein LCD display is connected with I/O mouthfuls of C8051F330 microcontrollers, the information preservation of arriving at a station of bus In nonvolatile storage AT24C64.

Cycle discriminator circuit is made up of input circuit, single-chip microcomputer, voltage zero-cross detection module and voltage comparator.Single-chip microcomputer From 89C52, input circuit is used for mains AC voltage by resistance and the partial pressure of diode, is converted to voltage comparator The input voltage of suitable stabilization.Voltage zero-cross detection module d type flip flop, voltage comparator selects LM393, its benchmark electricity Pressure uses the threshold voltage of mu balanced circuit burning voltage comparator.

Communications electronics switch uses reverse-blocking tetrode thyristor, and switch drive module includes input circuit and d type flip flop.The cycle Single-chip microcomputer 89C52 in discriminator circuit is additionally operable to control communications electronics switch, switch drive module.

SMS R-T unit (4) is made up of gsm module, SIM, microprocessor, eeprom memory, wherein GSM Module selects AT24C32 from chip TC35i, microprocessor from 89C51, eeprom memory.89C51 is by extending I2C Bus is connected with affiliated public transport station control and carries out data exchange, and TC35i is RS232 data ports, and 89C51 passes through serial line interface collection It is connected with TC35i into circuit and level shifting circuit chip MAX232.TC35i integrates radio circuit and base band, be data, Voice, short message and fax provide quick, reliable, safe transmission.TC35i has 40 pins, is divided into 5 classes, i.e. power supply, number According to input/output, SIM, COBBAIF and control.

TC35i supports AT Command Set, wherein containing the control to SMS, microprocessor sends a series of by TC35i AT is instructed, and completes the initialization to gsm module and receiving short message.The SIM of gsm module is connected to, must be first on mobile phone to SIM Card carries out necessary setting and enables and set Short Message Center's service number and make it possible to and the short message in GSM nets (6) Center contacts, therefore need not again carry out similar setting in use.Because only transceiving data, the transmitting-receiving of the system SMS 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 intelligent display board that arrives at a station, it is characterized in that public transport terminus sets master controller, respectively Bus station sets public transport station control, and master controller is with each public transport station control by the wave communication of power line half, each bus Installing Vehicle 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 It is arranged on the positive half cycle descending branch of cycle, 60% to 80% place of crest voltage is used as screening the place of point 1 and 30% to 45% as Zhen Other point 2, the positive half cycle descending branch of cycle is screened point and is arranged near the breakpoint of communication disruption close at the breakpoint of communication disruption, is filtered Most of interference is gone, has made communication more accurate in the position of the negative half-wave of cycle；

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 for detecting is true；

Lock in time is using 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 that the measured value of 100 grid cyclic wave times is taken into it in grid cyclic wave counting process to be averagely worth to；

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 anti-phase rear square-wave signal of negative half-wave of grid cyclic wave are followed by believing electricity all when arriving through 0.5MS time delays Sub switch, after 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 and switchs 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 device processed preset each station, with position in being travelled；When bus communicates with bus station, if setting when Between in interval without bus arrival, when communicate with first bus for arriving at a station afterwards, transmission marking signal M, bus Actual arrive at a station mileage and the setting mileage calculation that arrives at a station that measures when arriving at a station that Vehicle Controller will indicate M arrives at a station mileage error, takes 5 times The mileage error amount that arrives at a station above, is left out by setting ratio number of times and is up to station error for several times, and remaining is averaged as compensation It is worth for correcting measurement mileage, the time interval of the setting need to ensure while the bus for arriving at a station all leaves, and makes next The bus that arrives at a station is stopped to station location；

Use radio communication between bus and between bus and bus station, radio communication by radio-frequency module, microcontroller and Nonvolatile storage is constituted, and microcontroller selects C8051F330 chips, radio-frequency module to select nRF905, microcontroller C8051F330 is communicated by its SPI interface with nRF905, and public transport car kilometer output signal is connected to I/O mouthfuls of C8051F330, by C8051F330 is stored in nonvolatile storage after reading, and the communication data of Vehicle Controller is also stored in nonvolatile storage In；

Each bus station constitutes bus arrival information query system, each public transport station control according to the station bus circuit Address cycle sends detection signal, realizes that information is exchanged with bus station after the Vehicle Controller response of the bus of parking of arriving at a station, Arrived at a station simultaneously during to channel transmission answer signal with many buses of circuit, 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 6 meters of site location is exceeded 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 by S values to number, 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 disturb again The bus of communication, reduce it is described do not repeat to number again every 6 meters of values of scope, repeat said process to not producing interference, Its numbering fails to during the next stop；

Bus station communicates with bus and is also adopted by the different communication Channel cyclical setting of neighbor stations, and uplink is same with downgoing line Name site communication channel staggers and uses, 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 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, or vehicle is less when being difficult to complete car communicate with car, installation SMS receipts Transmitting apparatus, are communicated using receiving/sending mobile-phone short messages mode, and in bus travel direction, the bus station being located behind is regularly by bus Information of arriving at a station passes to front bus station with short message mode, in order to save the phone number yardage that each SMS R-T unit is used Amount, tdm communication is carried out by bus station's order, SMS R-T unit include gsm module, SIM, microprocessor and Eeprom memory, is controlled using microprocessor to gsm module, realizes that remote data is wirelessly transferred in SMS messaging mode.

2. the wave communication of public bus network according to claim 1 half and the information intelligent display board that arrives at a station, it is characterised in that include:

Controller (3) between master controller (1), Vehicle Controller (2), the bus station of bus, SMS R-T unit (4), Public transport station control (5)；Wherein Vehicle Controller (2) is made up of radio-frequency communication module and kilometer sensor, radio communication mould Block is made up of module nRF905, microcontroller C8051F330 and nonvolatile storage AT24C32, and radio-frequency module nRF905 passes through SPI interface communicates with microcontroller C8051F330, and other function pins of nRF905 are connected with I/O mouthfuls of C8051F330, C8051F330 is communicated by I2C bus modes with AT24C32；

Between master controller (1), bus station controller (3) and public transport station control (5) by radio-frequency module, cycle discriminator circuit, Communications electronics switch, switch drive module and LCD display are constituted, and wherein radio-frequency module is by module nRF905, microcontroller C8051F330 and nonvolatile storage AT24C64 is constituted, and LCD display is connected with I/O mouthfuls of C8051F330 microcontrollers；

Cycle discriminator circuit is made up of input circuit, single-chip microcomputer, voltage zero-cross detection module and voltage comparator；Single-chip microcomputer is selected 89C52, voltage zero-cross detection module d type flip flop, voltage comparator uses LM393, its reference voltage to use mu balanced circuit The threshold voltage of burning voltage comparator；

Communications electronics switch uses reverse-blocking tetrode thyristor, and switch drive module includes input circuit and d type flip flop；The cycle is screened Single-chip microcomputer 89C52 in circuit is additionally operable to control communications electronics switch, switch drive module；

SMS R-T unit (4) is made up of gsm module, SIM, microprocessor, eeprom memory, wherein gsm module AT24C32 is used using 89C51, eeprom memory using chip TC35i, microprocessor；89C51 is by extending I2C buses Being connected with affiliated public transport station control carries out data exchange, and TC35i is RS232 data ports, and 89C51 passes through the integrated electricity of serial line interface Road and level shifting circuit chip MAX232 are connected with TC35i.