Secondary main road traffic signal lamp control system based on GSM network

Secondary main road traffic signal lamp control system based on GSM network

  • CN 105,006,160 A
  • Filed: 07/12/2015
  • Published: 10/28/2015
  • Est. Priority Date: 07/12/2015
  • Status: Active Application
First Claim
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1. based on the subsidiary road traffic light control system 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, native system adopts both sides, flow export place, each track at the parting of the ways, from road surface height 0.4-0.8 rice, 0 ﹒

  • , 5 meters of-1 meter of are installed by laser-correlation device inwards at road surface stop line, 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, 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,The laser scanning pulse signal that in laser-correlation device, laser diode is launched under Single-chip Controlling, each cycle of this signal is made up of two broad pulses and two burst pulses, the low level pulse that the ending transmission one of each cycle is wide, 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 in the laser-correlation device on 4 tracks, the laser scanning pulse signal that laser diode sends, single-chip microcomputer adopts and interrupts or inquiry mode reception laser scanning pulse signal, and by single-chip microcomputer to its send and laser scanning pulse signal that it receives carry out pulse width and compare identification, extract the trusted signal of this frequency, effective eliminating external interference,When have vehicle by time produce block signal, the laser scanning pulse signal that light receiver head receives send single-chip microcomputer process after filter and amplification shaping, single-chip microcomputer obtains breaking time to by the laser scanning pulse signal timing of interdicting, the laser scanning pulse count signal simultaneously also received light receiver head, conversion obtain interval time, wherein express certain vehicle breaking time and pass through the time, a breaking time represents that a car passes through, and therefore can realize the vehicle count to passing through;

    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, 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, because cycle frequency is low, be easy to accurate identification decision and counting, 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.

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