Secondary main road traffic light controller based on GSM (global system for mobile communications) network

Secondary main road traffic light controller based on GSM (global system for mobile communications) network

  • CN 104,952,262 A
  • Filed: 07/12/2015
  • Published: 09/30/2015
  • Est. Priority Date: 07/12/2015
  • Status: Active Application
First Claim
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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.

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