CN104952262A - Secondary main road traffic light controller based on GSM (global system for mobile communications) network - Google Patents
Secondary main road traffic light controller based on GSM (global system for mobile communications) network Download PDFInfo
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- CN104952262A CN104952262A CN201510405074.8A CN201510405074A CN104952262A CN 104952262 A CN104952262 A CN 104952262A CN 201510405074 A CN201510405074 A CN 201510405074A CN 104952262 A CN104952262 A CN 104952262A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
- G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
Abstract
The invention relates to a secondary main road traffic light controller based on a GSM (global system for mobile communications) network. The secondary main road traffic light controller is characterized in that infrared photoelectric beam detectors mounted at lane outflow ports of a crossroad are adopted for measuring data of traffic stream permitted to pass the lane outflow ports and distances between adjacent vehicles, calculating the number of the vehicles passing the lane outflow ports and judging the jam condition of released vehicles, so that a traffic light timing scheme is determined in real time, and communication of the crossroads is realized in a short message form through the powerful GSM network.
Description
(1) technical field:
The present invention relates to the subsidiary road traffic light controller based on GSM network, it is by the infrared emission device being loaded on each track, crossroad flow export, measure and let pass by the wagon flow data at flow export place, track and the distance of fore-aft vehicle, calculate the vehicle number by flow export place, track and judge clearance vehicle congestion situation, determine traffic lights timing scheme in real time, and utilize powerful GSM network, realize communicating between each crossroad by the mode of sending short messages mutually.
(2) background technology:
Along with the develop rapidly of China's economy, Urban vehicles poputation and the sustainable growth of traffic total amount, and corresponding road infrastructure construction is difficult to catch up with in time, therefore in urban road network, particularly grade crossing it be again the bottleneck of road passage capability.Therefore improve the traffic capacity of grade crossing, improving crossroad traffic signal lamp control ability is a urgent problem.Outer mainly still the taking of Present Domestic carrys out optimization of road joints Traffic signal control according to road traffic measurement assessment and Principle of Statistics, vehicle flowrate measurement is the contactless traffic information collecting apparatus in a kind of road surface, is mainly divided into ripple detection frequently and the large class of video detection two.Adopt and receive vehicle reflection wave, the vehicle flowrate by surveyed area is added up by the change of low and high level, the microwave vehicle detecting device such as adopted it can be arranged on trackside lamp stand on or on special column, when the radar wave region that vehicle is launched by microwave generating apparatus, vehicle is detected.
Also the embedded underground inductive coil adopted near all directions at crossing is had, when automobile will produce eddy current loss through out-of-date, the inductance of ring-type insulated line starts to reduce, passing through of automobile can be detected, but inductive coil volume is approximately 2 meters × 2 meters, installs inconvenient and easily damaged by pressure and be difficult to widely use.
(3) summary of the invention:
Due to the staggered current interference mutually of the various wagon flow in intersection and the stream of people, its traffic capacity reduces greatly compared with independent section, traffic behavior is more complicated, often causes local traffic to block up, affects the unimpeded of whole road network.In order to improve the safety intersection of vehicle, conflicting wagon flow does not allow to let pass to vehicle simultaneously.Solution be in one-period, the time is divided into several sections and distribute to different wagon flow to vehicle let pass.The general traffic lights that all adopt command vehicle pass-through, and its Traffic signal control is usually with predicting or drawing traffic light time through simple algorithm.That then commands both direction with the various combination of red, yellow, and green lamp respectively is open to traffic with forbidden, indicates as countdown with LED charactron.Make vehicle obtain green light in conflicting wagon flow to the Different periods in one-period to let pass, and the wagon flow of mutually not conflicting to vehicle can obtain green light in the same period and let pass, thus a continuous time in one-period reaches the object of safety persuasion traffic current.
But the crossroad access signal lamp control system used is a kind of timing clearance system, when let pass in track or no thoroughfare for vehicles, the vehicle of its setting is let pass and no thoroughfare for vehicles, and the time is all changeless, because crossroad often there will be the busy situation difference in each track, busy track vehicle is a lot, the clearance time seems too short, wagon flow is blocked up, the wagon flow of at this moment conflicting but seldom even does not have vehicle sometimes to track vehicle, but the vehicle on busy track also will wait for that the wagon flow of conflict terminated just to be allowed to let pass to fixing " clearance " time in idle track, this quality time just greatly wasted limited road traffic resource and go out pedestrian.The current crossroad access Signalized control had, was divided into several fixing period by one day, rule of thumb assessed track day part busy extent, determine the timing scheme of day part, but this was also difficult to tally with the actual situation, and can not accomplish real-time requirement.
Therefore, only can only meet wagon flow to the requirement of traffic safety of not conflicting with assessment or expectation, this is inadequate, needs to measure each track vehicle fleet size so that the timing scheme of real-time conservative control signal lamp.But, the vehicle flowrate that current various vehicle measurement means is only applicable to because surveying instrument complex structure involves great expense flow measures assessment, for the real-time control of the intersection traffic signal had a large capacity and a wide range, its vehicle measuring equipment needs to possess the conditions such as structure is simple, installation is easy, cost is low.
Subsidiary road crossroad, small city pavement of road is narrower, generally only has two tracks, can only pass through two cars side by side, namely keep straight on, turns left, turn right and totally one use a track, the stop line of signal lamp intersection, represent the parking spot that vehicle waits for a green light.Therefore, native system adopts both sides, flow export place, each track at the parting of the ways, namely the flow export place, track towards crossroad on the right of the mid point of road surface is far from road surface height 0.4-0.8 rice, road surface stop line inwards 0 ﹒, 5 meters-1 meter installation infrared to injection device, for identifying whether flow export place, track the vehicle to be released such as has, and measure the vehicle number of letting pass by flow export place, track, the clearance time is calculated for rear crossroad access controller, measure the interval time of letting pass by the fore-aft vehicle at flow export place, track, for judging the jam situation of clearance vehicle simultaneously.If conflict the green light time from wagon flow to track at the end of, the vehicle that this flow export place, track is etc. not to be released, then the green light time in this track gets the shortest time, and the described shortest time must look the sidewalk width of wagon flow to track of conflict, getting 15 seconds-30 seconds, passing through for allowing pedestrian.When green light, if exceed setting value by the interval time of the fore-aft vehicle at flow export place, track, such as 5-12 second, namely think that clearance vehicle is little, if now the green light time has exceeded the described shortest time, then enter green light countdown in 15 seconds immediately, otherwise got the shortest time.The green light time is also actual with vehicle stop off, lane change and delay fails to enter this clearance time zone, and when letting pass by measuring, the interval time of fore-aft vehicle, changes the clearance time in real time.The concrete calculating clearance time is the vehicle number that the track sent by front crossroad access controller is flowed out, average speed, calculate and arrive this crossroad time, draw the vehicle number waited for a green light, the time of blocking of its every portion vehicle and interval time are added simultaneously, get identical value 2-4 second its interval time, obtain the clearance time that this flows to track vehicle, and send its data to rear crossroad access controller simultaneously, if this flows to the track green light time when closing to an end, according to the data that front crossroad access controller sends, still have and enter near this track green light clearance end time point more than 5-8 car, the wagon flow of simultaneously conflicting does not have vehicle to wait to track, then green light time delay 10-30 second, green time is longer, the vehicle number passed through is more, green time occupation rate reflects the bus capacity at crossing, namely meet wagon flow to vehicle pass-through demand larger, the green time distributing to it is longer, because this programme traffick number summation is more than waiting vehicle number, therefore the vehicle delay time at stop is substantially reduced.
Infrared emission device is made up of infrared transmitter, infrared receiving set, but infrared beam need be focused into thinner parallel beam by the optical lens focusing being placed in Transmitting and Receiving End respectively by its infrared beam, concentrates transmission to enable the energy of infrared light.The infrared scan pulse signal that in infrared transmitter, infrared diode is launched under Single-chip Controlling, each cycle of this signal is made up of two broad pulses and two burst pulses, a wide low level pulse is sent out in the ending of each cycle, when with broad pulse representative digit " 1 ", burst pulse representative digit " 0 " then easily uses 4 kinds of different permutation and combination, such as 1010, 0110, 0101, 1100 etc., identify the infrared scan pulse signal that in the infrared emission device on 4 tracks, infrared diode sends, single-chip microcomputer adopts and interrupts or inquiry mode reception infrared scan pulse signal, when in infrared receiving set, infrared sensor receives, by single-chip microcomputer to its send and infrared scan pulse signal that it receives compare identification, extract the trusted signal of this frequency, effective eliminating external interference.Single-chip microcomputer constantly receives the infrared scan pulse signal that in flow export place, each track infrared emission device, infrared diode sends at ordinary times, if certain track continues 15-30 at green light time infrared sensor do not receive infrared scan pulse signal second, namely alerting signal is sent, system transfers the work of traffic lights time control pattern to, control model when signal normally recovers to become again.Infrared band in sunshine is wider, and the infrared band energy of characteristic frequency is little, very little on the impact of infrared receiving set, and in order to anti-interference, ultrared power selects bigger numerical depending on crossroad weather conditions as far as possible.Although active infra-red greatly reduces the impact of the change of weather on injection device, but in order to safety, in infrared emission device, single-chip microcomputer constantly checks the infrared scan pulse signal that infrared sensor receives, when long-time abnormal infrared beam undesired signal discovery 15-40 second, affect infrared emission device normally to work, namely when it is not described infrared scan pulse signal, then the work of traffic lights time control pattern is transferred to, control model when signal normally recovers to become again.
When there being vehicle to pass through, relevant infrared emission device produces obstruction signal, the infrared scan pulse signal that infrared sensor receives send single-chip microcomputer process after filter and amplification shaping, single-chip microcomputer obtains breaking time to by the infrared scan pulse signal timing of interdicting, single-chip microcomputer is also to the infrared scan pulse count signal that infrared sensor receives simultaneously, conversion obtains interval time, wherein express certain vehicle breaking time and pass through the time, it is relevant with the speed of a motor vehicle and Vehicle length, also represent vehicle dwell time, a breaking time represents that a car passes through, therefore the vehicle count to passing through can be realized, represent fore-aft vehicle distance in wagon flow interval time, also with temporarily pass through relevant with or without vehicle.
Data transmission between each crossroad access controller of native system, utilizes powerful GSM network, just can realize communicating by the mode of sending short messages mutually between each crossroad.The SMS of GSM itself possesses data transport functions, the transmission of a message just constitutes and once communicates, the transmission of message always carries out relaying by the SMS service center (SMSC) being in GSM outside, the SMS service SMS of GSM it need not dial and can connect, the information that will send out is added that stay of two nights data are sent to short message service center, completes after storage sending to the final stay of two nights again through short message service center.So information can not be lost when GSM terminal and the stay of two nights are not started shooting.
The transmitting-receiving of note is completed by SMS R-T unit, in each crossroad, SMS R-T unit is all installed, and carry out one-way communication by SMS R-T unit, the note of reception front, each crossroad Traffic Flow at Intersection data also calculates time of arrival and vehicle number and is added with the current vehicle number waiting and determines this clearance time, and the more green times of the vehicle number making this wait are longer.Phone number yardage is taken in order to reduce, each crossroad SMS R-T unit shares two telephone number tdm communications, and by the arrangement of road order, if two telephone numbers are A and B, telephone number is then divided to be arranged as ABABAB ... and communicate in each stipulated time respectively, not at the SMS R-T unit deenergization of call duration time, only switch on power at the SMS R-T unit of call duration time.Because conventional clock circuit accumulation timing error is very large, every day, error did not include large for 5 minutes, therefore native system adopts the count value of the zero cross signal of detection of grid cycle as time reference, communication is started in the count value of the grid cyclic wave zero passage of setting to make SMS R-T unit, such as each communication is separated by a setting value of 50-250 grid cyclic wave (be equivalent to 1-5 second), the SMS R-T unit of each crossroad is by setting count value sequenced communications, the time of first time communication makes count value described in each SMS R-T unit reset by the clock through mutually correcting at the time point of agreement simultaneously, and carry out a call duration time point count value correction, the described setting count value receiving signal time point when namely complying with communication is the correction that standard carries out count value, accurate identification decision and counting is easy to because cycle frequency is low, therefore corrected once every 5-10 days after, greatly save software and hardware resources to take.For power network and not existing between the homophase line of electric force phase differential of different power transformer, owing to there is not cumulative errors, therefore not influential system to the error requirements of the time expressed by ondomete numerical value.
Traffic controller is made up of single-chip microcomputer, EEPRAM, I2C serial communication module, light-emitting diode display module and power module, wherein I2C serial communication module is used for the communication between SMS R-T unit, EEPRAM is for preserving data, light-emitting diode display module comprises driving circuit and display circuit, and it connects, by Single-chip Controlling with the I/O mouth of single-chip microcomputer.
(4) accompanying drawing illustrates:
Fig. 1 is that crossroad wagon flow is to distribution plan;
Fig. 2 is SMS R-T unit structural representation.
(5) embodiment:
Based on the subsidiary road traffic light controller of GSM network crossroad wagon flow to distribution plan as shown in Figure 1, this crossroad wagon flow is to distribution plan, only represent the one that various dissimilar wagon flow controls to distribution and wagon flow thereof, the control system that other type wagon flow controls to distribution and wagon flow thereof is easily obtained by analogy.When in Fig. 1 being East and West direction when red, in north-south, A is the straight-through green light time of turning with left and right.
Described SMS R-T unit structural representation as shown in Figure 2.Its structure by:
Power supply (1), single-chip microcomputer (2), gsm module (3), SIM card (4), eeprom memory (5) form.In SMS R-T unit, single-chip microcomputer (2) realizes serial communication by I2C bus and traffic controller (6), and general supply (7) provides the power supply (1) of SMS R-T unit under traffic controller (6) controls.
System utilizes single-chip microcomputer (2) to control gsm module (3), remote data wireless transmission can be realized in SMS messaging mode, serial port and the gsm module (3) of single-chip microcomputer (2) are directly connected, complete the initialization to gsm module (3), realize the transmission-receiving function of short message, single-chip microcomputer (2) extends the coding and decoding that EEPRAM storer (5) is used for storing user data and short message.Gsm module (3) adopts chip TC35i, single-chip microcomputer (2) to adopt a 89C51 and eeprom memory (5) to adopt chip AT24C32, and its Main Function stores data, and power cut-off information also can not be lost.In addition, single-chip microcomputer (2) 89C51 is also connected with affiliated intersection traffic controller (6) by expansion I2C bus and carries out exchanges data.Gsm module (3) chip TC35i, it is RS232 data port, and single-chip microcomputer (2) 89C51 is connected with gsm module (3) with level shifting circuit chip MAX232 by serial line interface integrated circuit.
Gsm module (3) chip TC35i integrates radio circuit and base band, for data, voice, short message and fax provide quick, reliable, safe transmission, TC35i has 40 pins, is divided into 5 classes, i.e. power supply, data I/O, SIM card, audio interface and control.
Gsm module (3) chip TC35i supports AT Command Set, wherein contains the control to SMS, and single-chip microcomputer, by sending a series of AT instruction to gsm module (3), completes the initialization to gsm module (3) and receiving short message.Be connected to the SIM card (4) of gsm module (3), must first carry out necessary arrange enable and setting Short Message Center's service number and make it to contact with Short Message Center to SIM card (4) on mobile phone, therefore in use not need to carry out similar setting again.
Because only transceiving data, the transmitting-receiving of SMS adopts TEXT pattern.TEXT pattern is a kind of tactic pattern based on ASCII character.Native system user data is the ASCII character of limited no more than tens character quantities, single-chip microcomputer (2) on the contrary the character string received directly with forms mode table look-up convert command code and data to or convert thereof into ASCII character send.
Claims (2)
1. based on the subsidiary road traffic light controller of GSM network, it is characterized in that, subsidiary road crossroad, small city pavement of road is narrower, generally only have two tracks, namely keep straight on, turn left, turn right and totally one use a track, system adopts both sides, flow export place, each track at the parting of the ways, from road surface height 0.4-0.8 rice, road surface stop line inwards 0 ﹒, 5 meters-1 meter installation infrared to injection device, for identifying whether flow export place, track the vehicle to be released such as has, and measure the vehicle number of letting pass by flow export place, track, the clearance time is calculated for rear crossroad access controller, measure the interval time of letting pass by the fore-aft vehicle at flow export place, track simultaneously, for judging the jam situation of clearance vehicle, if conflict the green light time from wagon flow to track at the end of, the vehicle that this flow export place, track is etc. not to be released, then the green light time in this track gets the shortest time, the described shortest time must look the sidewalk width of wagon flow to track of conflict, get 15 seconds-30 seconds, pass through for allowing pedestrian, when green light, if exceed setting value by the interval time of the fore-aft vehicle at flow export place, track, namely think that clearance vehicle is little, if now the green light time has exceeded the described shortest time, then enter green light countdown in 15 seconds immediately, otherwise get the shortest time, the green light time is also with vehicle stop off, lane change and delay and actually fail to enter this clearance time zone, the interval time of fore-aft vehicle when letting pass by measuring, the real-time change clearance time, the concrete calculating clearance time is the vehicle number that the track sent by front crossroad access controller is flowed out, average speed, calculate and arrive this crossroad time, draw the vehicle number waited for a green light, the time of blocking of its every portion vehicle and interval time are added simultaneously, get identical value 2-4 second its interval time, obtain the clearance time that this flows to track vehicle, and send its data to rear crossroad access controller simultaneously, if this flows to the track green light time when closing to an end, according to the data that front crossroad access controller sends, still have and enter near this track green light clearance end time point more than 5-8 car, the wagon flow of simultaneously conflicting does not have vehicle to wait to track, then green light time delay 10-30 second,
The infrared scan pulse signal that in infrared transmitter, infrared diode is launched under Single-chip Controlling, each cycle of this signal is made up of two broad pulses and two burst pulses, a wide low level pulse is sent out in the ending of each cycle, when with broad pulse representative digit " 1 ", burst pulse representative digit " 0 " then easily uses 4 kinds of different permutation and combination, 1010, 0110, 0101, 1100, identify the infrared scan pulse signal that the infrared diode on 4 tracks sends, single-chip microcomputer adopts and interrupts or inquiry mode reception infrared scan pulse signal, when in infrared receiving set, infrared sensor receives, by single-chip microcomputer to its send and infrared scan pulse signal that it receives compare identification, extract the trusted signal of this frequency, effective eliminating external interference, single-chip microcomputer constantly receives the infrared scan pulse signal that flow export place, each track infrared diode sends at ordinary times, if certain track continues 15-30 at green light time infrared sensor do not receive infrared scan pulse signal second, or find long-time abnormal infrared beam undesired signal 15-40 second, affect infrared emission device normally to work, namely alerting signal is sent, system transfers the work of traffic lights time control pattern to, control model when signal normally recovers to become again,
When there being vehicle to pass through, relevant infrared emission device produces obstruction signal, the infrared scan pulse signal that infrared sensor receives send single-chip microcomputer process after filter and amplification shaping, single-chip microcomputer obtains breaking time to by the infrared scan pulse signal timing of interdicting, and single-chip microcomputer also receives infrared sensor simultaneously infrared scan pulse count signal, conversion obtain interval time;
In each crossroad, SMS R-T unit is all installed, utilize powerful GSM network, one-way communication is carried out by SMS R-T unit, the note of reception front, each crossroad Traffic Flow at Intersection data, and calculate time of arrival and vehicle number and be added with the current vehicle number waiting and determine this clearance time, the more green times of the vehicle number making this wait are longer, phone number yardage is taken in order to reduce, each crossroad SMS R-T unit shares two telephone number tdm communications, and by the arrangement of road order, if two telephone numbers are A and B, telephone number is then divided to be arranged as ABABAB and communicate in each stipulated time respectively, not at the SMS R-T unit deenergization of call duration time, only switch on power at the SMS R-T unit of call duration time, because conventional clock circuit accumulation timing error is very large, therefore native system adopts the count value of the zero cross signal of detection of grid cycle as time reference, communication is started in the count value of the grid cyclic wave zero passage of setting to make SMS R-T unit, the SMS R-T unit of each crossroad is by setting count value sequenced communications, the time of first time communication makes count value described in each SMS R-T unit reset by the clock through mutually correcting at the time point of agreement simultaneously, and carry out a call duration time point count value correction, the described setting count value receiving signal time point when namely complying with communication is the correction that standard carries out count value, accurate identification decision and counting is easy to because cycle frequency is low, greatly save software and hardware resources to take, for power network and not existing between the homophase line of electric force phase differential of different power transformer, owing to there is not cumulative errors, therefore not influential system to the error requirements of the time expressed by ondomete numerical value.
2. the subsidiary road traffic light controller based on GSM network according to claim 1, is characterized in that comprising:
Fig. 2 is SMS R-T unit structural drawing, be made up of power supply (1), single-chip microcomputer (2), gsm module (3), SIM card (4), eeprom memory (5), in SMS R-T unit, single-chip microcomputer (2) realizes serial communication by I2C bus and traffic controller (6), and general supply (7) provides the power supply (1) of SMS R-T unit under traffic controller (6) controls;
Gsm module (3) adopts chip TC35i, single-chip microcomputer (2) adopts a 89C51 and eeprom memory (5) to adopt chip AT24C32, its Main Function stores data, and power cut-off information also can not be lost, in addition, single-chip microcomputer (2) 89C51 is also connected with affiliated intersection traffic controller (6) by expansion I2C bus and carries out exchanges data, gsm module (3) chip TC35i, it is RS232 data port, single-chip microcomputer (2) 89C51 is connected with gsm module (3) with level shifting circuit chip MAX232 by serial line interface integrated circuit,
Because only transceiving data, the transmitting-receiving of SMS adopts TEXT pattern, TEXT pattern is a kind of tactic pattern based on ASCII character, native system user data is the ASCII character of limited no more than tens character quantities, single-chip microcomputer (2) on the contrary the character string received directly with forms mode table look-up convert command code and data to or convert thereof into ASCII character send.
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