CN205050347U

CN205050347U - Intelligence time delay traffic signal lamp system based on PLC control

Info

Publication number: CN205050347U
Application number: CN201520836090.8U
Authority: CN
Inventors: 张永德; 阮彦飞; 王瑞雪; 王开瑞
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2015-10-27
Filing date: 2015-10-27
Publication date: 2016-02-24
Anticipated expiration: 2025-10-27

Abstract

The utility model relates to an intelligence time delay traffic signal lamp system based on PLC control belongs to the traffic control and the communications field. Including car flow measurement circuit, PLC controller, signal lamp display circuit. Control system divide into daytime the control model and night the control model. The control model divide into normal mode and the strong mode of leading to daytime. Under the normal mode, utilize the built -in counter of PLC to count and calculate the each side to vehicle quantity and to the vehicle holdup in lane, judge whether need the green light time delay, detect whether require strong expert simultaneously. There is the anxious vehicle -hour, opens corresponding strong logical switch, let anxious car pass through earlier. Control model lane signal lamp became the amber light full night. The utility model discloses application real -time detection, judge the time delay, when having avoided a direction heavy traffic vehicle of a certain direction more but be the red light, and other directions do not have the car still for the green light, have alleviateed the pressure of rush -hour and blocking up of main trunk road crossing, reach traffic intelligent system's availability the highest.

Description

A kind of Intelligent time delay traffic signal lamp system controlled based on PLC

technical field:

The utility model relates to the utility model and relates to a kind of Intelligent time delay traffic signal lamp system controlled based on PLC, belongs to traffic control and the communications field.。

background technology:

Along with China's rapid economic development, living standards of the people are generally improving, and the people having private car is also little by little increasing, and this makes the traffic jam issue in city day by day highlight.Therefore, in order to ensure that urban transportation is orderly, safety, fast, improve the traffic capacity of city road network, the scientific management realizing traffic is extremely urgent.Traditional crossroad access controls lamp, and common way is: in advance through the investigation of vehicle flow, uses the method for statistics the time delay of the traffic lights of both direction to be pre-set.But in fact vehicle flowrate is a variable, and its mensuration is uncertain.Different crossings is in the different periods, and vehicle flowrate also exists very large difference.。Even if through long test run, still may occur such phenomenon: what vehicle process green light direction does not almost have, and the vehicle in red light direction is arranged queue and is waited.Occur this situation, unavoidably can have influence on the mood of driver, complaints are heard everywhere for the passenger that makes more or less, and be also a kind of waste to man power and material.

In order to solve the problem, a kind of scheme controlled that can automatically adjust according to the situation of change of vehicle flowrate is adopted to be very real and necessary.The utility model is the crossroad access modulating signal system controlled based on PLC.This intelligent traffic signal control system uses detection in real time, judges time delay, avoiding the vehicle of a direction during a direction heavy traffic more is but red light, but other directions are but without car or the vehicle less still light yellow green light that passes through, alleviate the pressure of rush-hour and blocking up of main trunk road crossing, the effective rate of utilization of traffic intelligent system is reached the highest.Effectively can improve the traffic efficiency of crossroad, alleviate traffic congestion.

utility model content:

For above-mentioned situation, for solving the defect of prior art, the utility model object just there is provided a kind of Intelligent time delay traffic signal lamp system controlled based on PLC, comprise vehicle Flow Detection circuit, PLC, traffic light system circuit, it is characterized in that, vehicle Flow Detection circuit of telling is arranged on by crossroad, described traffic light system circuit and PLC are arranged on the signal light frame of crossroad, wherein, the described traffic lights connection control traffic lights run for controlling wagon flow indicates the crossroad signal controlling machine of handover module and mode switch module, it is characterized in that: described crossroad signal controlling machine is connected with the piezoelectric sensor being located at each crossroad exit ramp, the described piezoelectric sensor distance be embedded in from edge, intersection exit road is the underground at 160m place.

Preferably, described a kind of Intelligent time delay traffic signal lamp system controlled based on PLC, it is characterized in that, described PLC is the CPU of S7-200PLC, S7-200PLC is CPU226, and expansion module is EM223.

Preferably, described a kind of Intelligent time delay traffic signal lamp system controlled based on PLC, it is characterized in that, described mode switch module is divided into day mode to control and Night controls, and described day mode controls to be divided into normal mode to control and strong logical Schema control.

The beneficial effects of the utility model are:

The utility model intelligent traffic signal control system uses detection in real time, judges time delay, avoiding the vehicle of a direction during a direction heavy traffic more is but red light, but other directions are but without car or the vehicle less still light yellow green light that passes through, alleviate the pressure of rush-hour and blocking up of main trunk road crossing, and control system is divided into control model and control model at night two sections of controls on daytime, daytime, control model was also provided with strong logical pattern, when there being anxious car, anxious car is allowed preferentially to pass through.Night, control model lane signal lamp became amber light entirely, reminded nighttime driving personnel careful driving.Meanwhile, Night is disconnected the switch of vehicle detection counting, saves electricity consumption.The effective rate of utilization of traffic intelligent system is reached the highest.Effectively can improve the traffic efficiency of crossroad, alleviate traffic congestion.

accompanying drawing illustrates:

For ease of illustrating, the utility model is described in detail by following concrete enforcement and accompanying drawing.

Accompanying drawing 1 is the utility model PLC external wiring diagram

Accompanying drawing 2 is the utility model crossing Plant arrangement schematic diagram

embodiment:

For making the purpose of this utility model, technical scheme and advantage clearly understand, below by the specific embodiment shown in accompanying drawing, the utility model is described.But should be appreciated that, these describe just exemplary, and do not really want to limit scope of the present utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present utility model.

The utility model provides a kind of Intelligent time delay traffic signal lamp system controlled based on PLC, it comprises vehicle Flow Detection circuit, PLC, traffic light system circuit, it is characterized in that, control system is divided into control model and control model at night two sections of controls on daytime, night, control model signal lamp became amber light, and daytime, control model was divided into normal mode and strong logical pattern; Under normal mode, after signal lamp timing operation half period, utilize piezoelectric sensor to detect passing through of vehicle in track, then utilize the built-in counter of PLC to count vehicle fleet size and calculate the vehicle hold-up in all directions track, judge whether to realize green light time delay according to time delay condition, detect simultaneously and whether require strong leading to; When having anxious car, that opens correspondence opens up pass by force, allows anxious car first pass through; Night, control model lane signal lamp became amber light entirely, reminded nighttime driving personnel careful driving, and meanwhile, Night is disconnected the switch of vehicle detection counting, saves electricity consumption; Described vehicle Flow Detection circuit is the wagon flow being detected crossroad all directions by piezoelectric sensor; Apart from each meter Chu underground, crossroad 160 and imbed piezoelectric sensor, undetected phenomenon is there is for preventing vehicle, the laying of described ring-type insulated line in underground we establish and take in the upper export place (stop line place) of each driveway and respectively lay an identical detecting device in the place of the import from export place one Dingyuan, the distance apart of the two sensors on same station track for the longest stopping distance that allows when this track is normally run as well.

In the present embodiment, the overall control thought of the utility model control system told is the one-period starting PLC, resets and exports sum counter, arrange initial value simultaneously.Meanwhile, read the current time of PLC, and multilevel iudge.Be more than or equal to 5 when PLC current time and be less than etc. 22, namely during this period of time, taking control model on daytime morning 5 to evening 23.When PLC current time is greater than 22 or be less than 5, namely evening 23 is to some next day 5, takes control model at night.By day under control model, after executing one-period, again read and multilevel iudge PLC current time, if or be in daytime period, then continue to perform control model on daytime, until execute certain week after date, PLC current time enters night-time hours, performs control model at night.Under night control model, read constantly and compare PLC current time, once not meet, then enter control model on daytime.

Described the utility model control model on daytime is the major part of control system, is main, the important method of operation of control system.Concrete flow process, as shown in Figure 2 when PLC current time belongs to the time period of day mode, starts vehicle count and strong logical detection, GA lamp work simultaneously.First thing left-hand rotation green light, the time is that 20s(can set based on experience value); After timing terminates, thing left-hand rotation green light dodges 2s, no left turn vehicle pass-through; Then the bright 3s of left-hand rotation amber light; While amber light goes out, thing craspedodrome green light, first timing 30s(sets based on experience value), after timing terminates, trigger, time delay condition is: the maximum hold-up > of thing wagon flow maximum hold-up-north and south wagon flow ties definite value δ and north and south wagon flow hold-up is less than δ and delay time does not exceed the maximum delay time; When time delay condition no longer meets, thing craspedodrome green light dodges 2s; Then the bright 3s of thing craspedodrome amber light; So far, half period terminates.Next be pass through in north and south, pass through similar with thing, first north and south left-hand rotation green light 30s, then dodges 2s, and then amber light is bright; Again then, north and south craspedodrome green light and time delay, after time delay terminates, green light dodges 2s, and then amber light is bright.Whole end cycle.

Described the utility model Night is very simple, and when PLC current time belongs to the Night time period, lane signal lamp becomes amber light entirely, reminds nighttime driving personnel careful driving.Meanwhile, Night is disconnected the switch of vehicle detection counting, saves electricity consumption.

Strong logical pattern belongs to control module important in control module on daytime.Emergency vehicle forces break-make by leading to switch control rule by force.When not having anxious car, control according to usual recycle scheme, when anxious car comes, open anxious car logical button by force, no matter before RST how, all by force the direction green light that anxious car travels opened, until anxious car normally runs over just return to original state.After anxious car normally runs over, reinstatement state mode can be adopted, also can adopt the mode that then this state down circulates.Because reinstatement state needs switching time through 5s (in order to safety, need to add that green light dodges 2s, amber light 3s), and anxious car was more or less the same with fixing timing by the time at crossing, and reinstatement state might not be rational, therefore adopt the mode of then leading to by force state and down circulating.

More than show and describe ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. the Intelligent time delay traffic signal lamp system controlled based on PLC, comprise vehicle Flow Detection circuit, PLC, expansion module EM223, traffic lights display circuit, traffic light signals lamp instruction handover module, traffic light signals lamp mode switch module, it is characterized in that: described vehicle Flow Detection circuit is arranged on by crossroad, described traffic light system circuit and PLC are arranged on the signal light frame of crossroad, described PLC is connected with the piezoelectric sensor being located at each crossroad exit ramp by RS485 communication interface, the distance that described piezoelectric sensor is embedded in from edge, intersection exit road is 160m place.

2. a kind of Intelligent time delay traffic signal lamp system controlled based on PLC according to claim 1, is characterized in that: described PLC is the CPU of S7-200PLC, S7-200PLC is CPU226, and expansion module is EM223.