CN105761517A - Signal light timing method - Google Patents
Signal light timing method Download PDFInfo
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- CN105761517A CN105761517A CN201610330062.8A CN201610330062A CN105761517A CN 105761517 A CN105761517 A CN 105761517A CN 201610330062 A CN201610330062 A CN 201610330062A CN 105761517 A CN105761517 A CN 105761517A
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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
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0125—Traffic data processing
- G08G1/0129—Traffic data processing for creating historical data or processing based on historical data
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Abstract
The invention provides a signal light timing method. The signal light timing method comprises the following steps of 1 historical volume data acquiring; 2 histogram drawing; 3 signal light timing setting; 4 data calibrating; 5 final timing scheme determining. According to the signal light timing method, an initial allocation scheme of a group of signal lights on a road is set by analyzing historical traffic volume data, the adaptivity and the real-time performance are good, the time lengths of the signal lights are different in each cycle time period and even every day, the timing time length of the original or newly-added signal lights on the road can be effectively optimized, and the method is beneficial for smooth driving on the road.
Description
Technical field
The present invention relates to technical field of transportation, refer in particular to a kind of traffic signal timing method.
Background technology
Existing a lot of traffic signal timing scheme does not have adaptivity, reason is that the formulation criterion of these traffic signal timing schemes is mostly derived from the mode of road experience or Theoretical Calculation and draws the timing scheme of several groups of set time sections, it is impossible to suitable in various roads environment；Some traffic signal timing scheme has adaptivity, but owing to original initial configuration scheme does not have adaptivity, causes that the adaptivity of this kind of timing scheme is not very good.
Summary of the invention
In order to solve existing traffic signal timing scheme, not there is adaptivity or the problem of adaptivity difference, the present invention proposes a kind of traffic signal timing method, by analyzing special bus flow historical data, one group of signal lights initial configuration scheme on road is set, so that signal lights self-adaptative adjustment timing, road is conducive to pass unimpeded.
The technical solution adopted in the present invention is: a kind of traffic signal timing method, comprises the steps:
S1, obtains historical traffic data: a selected road having several crossroads, wherein the n-th crossing is designated as Nn, crossing Nn4 directions be respectively designated as Nn 1、Nn 2、Nn 3And Nn 4, from historical traffic data storehouse, obtain the rate β that blocks up of each direction, this crossing vehicle flowrate in the left-hand rotation set in the time period, right-hand rotation and three kinds of travel directions of craspedodrome and road；
S2, draw rectangular histogram: according to the step S1 historical traffic data obtained, select a crossing, by the cycle time of each travel direction in direction, each crossing in section vehicle flowrate be depicted as rectangular histogram, in cycle time, every 30 seconds are transverse axis x, corresponding vehicle flowrate data are longitudinal axis y, and histogram-fitting is become curve；
S3, traffic signal timing is arranged: each direction, crossing, is what turn left for travel direction, if direction, crossing left turn traffic amount > θ1And the reciprocal craspedodrome flow in this direction, crossing > θ2, then turn left to be separately provided green light, otherwise do not need to be separately provided green light；Being what keep straight on for travel direction, by function f, (k, h l) are calculated the timing obtaining green light, are obtained the timing of corresponding red light by signal lights phase place setting principle, wherein f (k, h, l)=α1k+α2h+α3L, k are the average vehicle flow in step S2 in histogram calculation gained cycle time, and h is the highest vehicle flowrate, and l is minimum vehicle flowrate, α1、α2、α3For constant parameter；
S4, data calibration: according to step S3 gained timing scheme, the statistical vehicle flowrate data second calculates the rate β that blocks up1, will block up rate β1Compare with the rate β of blocking up, ifThen timing is reasonable, and wherein γ is experience percent, otherwise needs to optimize constant parameter α1、α2、α3；
S5, it is determined that final timing scheme: repeat step S3 and calculate and step S4 calibration, it is thus achieved that the timing scheme that entire road is final.
As preferably, in described step S2, histogram-fitting becomes curve to adopt method of least square, and concrete grammar is: set function y=f (x), and plane has i mutually different point, and (x, y), the distance putting function curve is di, make i some function y=f (xi) the quadratic sum of distance minimum, namely
As preferably, described experience percent γ is 8%.
The invention has the beneficial effects as follows: have adaptivity and a real-time, the signal lights duration of each section cycle time even every day is different from, and can effectively optimize that road is original or the timing duration problem of newly-increased signal lights.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention；
Fig. 2 is crossroad N1 1The data on flows exemplary plot of travel direction；
Fig. 3 is crossroad N1 1Vehicle flowrate data when travel direction is keep straight on；
Fig. 4 is crossroad N1 1The phase analysis that left-hand rotation green light timing is arranged.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
A kind of traffic signal timing method, concrete steps as shown in Figure 1:
The first step, obtains historical traffic data.
A selected road having several crossroads, wherein the n-th crossing is designated as Nn, crossing Nn4 directions be respectively designated as Nn 1、Nn 2、Nn 3And Nn 4, from historical traffic data storehouse, obtain the rate β that blocks up of each direction, this crossing vehicle flowrate in the left-hand rotation set in the time period, right-hand rotation and three kinds of travel directions of craspedodrome and road.
If Fig. 2 is the N of crossroad1 1The data on flows of travel direction, the time turned left, turn right and keep straight in this crossing is TTurn left, TTurn rightAnd TKeep straight on, all directions vehicle flowrate of corresponding time period is expressed as DTurn left, DTurn rightAnd DKeep straight on。
Second step, draws rectangular histogram.
According to the step S1 historical traffic data obtained, select a crossing, by the cycle time of each travel direction in direction, each crossing in section vehicle flowrate be depicted as rectangular histogram, in cycle time, every 30 seconds are transverse axis x, corresponding vehicle flowrate data are longitudinal axis y, and histogram-fitting is become curve.
The crossing N of corresponding diagram 21 1, when travel direction is for keeping straight on, normal vehicle operation, usual cycle time is 1 hour, at some cycles time TKeep straight onIn, study every 30 seconds vehicle flowrate data DKeep straight on.With T cycle timeKeep straight onInterior every 30 seconds is transverse axis x, and corresponding vehicle flowrate data are that longitudinal axis y sets up rectangular histogram, and the data distribution in rectangular histogram represents the vehicle flowrate of correspondence in section cycle time, by method of least square, histogram-fitting is become curve, and method is as follows:
If function y=f (x), plane has i mutually different point, and (x, y), the distance putting function curve is di, make i some function y=f (xi) the quadratic sum of distance minimum, namely
N1 1When the travel direction in direction, crossing is for keeping straight on, by method of least square, histogram-fitting become the result of curve as shown in Figure 3.In like manner can obtain N1 1The travel direction in direction, crossing is the rectangular histogram turned left and turn right.
3rd step, traffic signal timing is arranged.
Each direction, crossing, is what turn left for travel direction, it is judged that turn left the need of being separately provided green light in certain crossroad, if direction, crossing left turn traffic amount > θ1And the reciprocal craspedodrome flow in this direction, crossing > θ2, then turn left to be separately provided green light, otherwise do not need to be separately provided green light.Left rotaring signal lamp timing method is identical with craspedodrome.
Wherein, threshold θ is set according to the actual vehicle flowrate in this crossing1、θ2, represent that the vehicle flowrate of left-hand rotation and the vehicle flowrate of opposite direction craspedodrome affect the minimum vehicle flowrate of traffic respectively.
As shown in Figure 4, crossroad N1 1The vehicle flowrate in direction is designated as DTurn left, N1 4The vehicle flowrate in direction is designated as D,Keep straight on.According to the phase place principle that signal lights is arranged, friendship traffic can be affected when the vehicle flowrate that the vehicle flowrate turned left and opposite direction are kept straight on is bigger, so arranging threshold θ according to actual vehicle flowrate situation1And θ2, work as DTurn left> θ1And D 'Keep straight on> θ2, now turn left to be separately provided green light.
Being what keep straight on for travel direction, by function f, (k, h l) are calculated the timing obtaining green light, are obtained the timing of corresponding red light by signal lights phase place setting principle, wherein f (k, h, l)=α1k+α2h+α3L, k are the average vehicle flow in step S2 in histogram calculation gained cycle time, and h is the highest vehicle flowrate, and l is minimum vehicle flowrate, α1、α2、α3For constant parameter.Constant parameter α1、α2、α3First random setting so that initial traffic signal timing, between the 30-60 second, then obtains again through iteration optimization.
For N1 1Histogram data analysis when the travel direction in direction, crossing is keep straight on, can obtain the average vehicle flow in cycle time by histogram calculation is k1, the highest vehicle flowrate is h1, minimum vehicle flowrate is l1, then the timing calculation of green light is by function f (k1,h1,l1) obtain: N1 1TGreen=f (k1,h1,l1)=α1k1+α2h1+α3l1(α1、α2、α3For constant parameter).
In like manner can obtain direction N1 2、N1 3And N1 4Green light timing, be N respectively1 2TGreen、N1 3TGreenAnd N1 4TGreen.Due to signal lights phase place setting principle, N1 1TRed=N1 2TGreen, in like manner can obtain direction N1 2、N1 3And N1 4Red light timing, be N respectively1 2TRed、N1 3TRedAnd N1 4TRed。
At this, turn left identical with craspedodrome with right turn signal lamp timing method.
4th step, data calibration.
According to step S3 gained timing scheme, the statistical vehicle flowrate data second calculates the rate β that blocks up1, will block up rate β1Compare with the rate β of blocking up, ifThen timing is reasonable.
Wherein γ is experience percent, it is possible to takes γ=8% or is optimized the value of γ by practical situation, otherwise needs to optimize constant parameter α1、α2、α3.Here rate of blocking up calculates the speed of service and the lane occupancy ratio that are referred to difference in functionality grade road.
5th step, finally determines timing scheme: that repeats the 3rd step calculates the calibration with the 4th step, it is thus achieved that the timing scheme that entire road is final.
Above example is only the technological thought that the present invention is described, it is impossible to limits protection scope of the present invention, every technological thought proposed according to the present invention, any change done on technical scheme basis with this, each falls within protection scope of the present invention.
Claims (3)
1. a traffic signal timing method, it is characterised in that: comprise the steps:
S1, obtain historical traffic data: a selected road having several crossroads, there are several directions at each crossing, obtains the rate β that blocks up of each direction, each crossing vehicle flowrate in the left-hand rotation set in the time period, right-hand rotation and three kinds of travel directions of craspedodrome and road from historical traffic data storehouse；
S2, draw rectangular histogram: according to the step S1 historical traffic data obtained, select a crossing, by the cycle time of each travel direction in direction, each crossing in section vehicle flowrate be depicted as rectangular histogram, in cycle time, every 30 seconds are transverse axis x, corresponding vehicle flowrate data are longitudinal axis y, and histogram-fitting is become curve；
S3, traffic signal timing is arranged: each direction, crossing, is what turn left for travel direction, if direction, crossing left turn traffic amount > θ1And the reciprocal craspedodrome flow in this direction, crossing > θ2, then turn left to be separately provided green light, otherwise do not need to be separately provided green light；Being what keep straight on for travel direction, by function f, (k, h l) are calculated the timing obtaining green light, are obtained the timing of corresponding red light by signal lights phase place setting principle, wherein f (k, h, l)=α1k+α2h+α3L, k are the average vehicle flow in step S2 in histogram calculation gained cycle time, and h is the highest vehicle flowrate, and l is minimum vehicle flowrate, α1、α2、α3For constant parameter；
S4, data calibration: according to step S3 gained timing scheme, the statistical vehicle flowrate data second calculates the rate β that blocks up1, will block up rate β1Compare with the rate β of blocking up, ifThen timing is reasonable, and wherein γ is experience percent, otherwise needs to optimize constant parameter α1、α2、α3；
S5, it is determined that final timing scheme: repeat step S3 and calculate and step S4 calibration, it is thus achieved that the timing scheme that entire road is final.
2. a kind of traffic signal timing method according to claim 1, it is characterized in that: in described step S2, histogram-fitting becomes curve to adopt method of least square, concrete grammar is: set function y=f (x), plane has i mutually different point (x, y), to the distance of function curve be di, make i some function y=f (xi) the quadratic sum of distance minimum, namely
3. a kind of traffic signal timing method according to claim 1, it is characterised in that: described experience percent γ is 8%.
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| CN107293133A (en) * | 2017-08-14 | 2017-10-24 | 清华大学深圳研究生院 | A kind of method for controlling traffic signal lights |
| CN108171996A (en) * | 2018-01-04 | 2018-06-15 | 重庆公共运输职业学院 | A kind of self-adapting intelligent traffic lights control method |
| CN109697867A (en) * | 2019-01-28 | 2019-04-30 | 深圳市欧德克科技有限公司 | A kind of traffic control method and system based on deep learning |
| CN110209068A (en) * | 2019-06-11 | 2019-09-06 | 滁州学院 | A kind of traffic lights timing designing and simulation method |
| CN110610607A (en) * | 2019-07-26 | 2019-12-24 | 浙江工业大学 | Traffic-based SCATS control scheme operation cycle automatic diagnosis method and system |
| CN110782667A (en) * | 2019-10-30 | 2020-02-11 | 北京百度网讯科技有限公司 | Signal lamp time-sharing timing method and device, electronic equipment and storage medium |
| CN110930735A (en) * | 2019-11-06 | 2020-03-27 | 北京百度网讯科技有限公司 | Intelligent traffic control method, device, equipment and storage medium |
| CN113920730A (en) * | 2021-10-11 | 2022-01-11 | 北京易华录信息技术股份有限公司 | Signal lamp time distribution method and device, electronic equipment and storage medium |
| CN113947927A (en) * | 2021-12-06 | 2022-01-18 | 文思海辉智科科技有限公司 | Adjusting method and device for traffic signal lamp timing |
| CN114299733A (en) * | 2021-09-14 | 2022-04-08 | 逸兴泰辰技术有限公司 | Crossing traffic light passing time adjusting system |
| CN115273499A (en) * | 2022-06-30 | 2022-11-01 | 华东师范大学 | Traffic flow-based signal lamp dynamic timing method and system |
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| CN107293133A (en) * | 2017-08-14 | 2017-10-24 | 清华大学深圳研究生院 | A kind of method for controlling traffic signal lights |
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| CN110782667A (en) * | 2019-10-30 | 2020-02-11 | 北京百度网讯科技有限公司 | Signal lamp time-sharing timing method and device, electronic equipment and storage medium |
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| CN110930735B (en) * | 2019-11-06 | 2021-05-28 | 北京百度网讯科技有限公司 | Intelligent traffic control method, device, equipment and storage medium |
| CN110930735A (en) * | 2019-11-06 | 2020-03-27 | 北京百度网讯科技有限公司 | Intelligent traffic control method, device, equipment and storage medium |
| CN114299733A (en) * | 2021-09-14 | 2022-04-08 | 逸兴泰辰技术有限公司 | Crossing traffic light passing time adjusting system |
| CN114299733B (en) * | 2021-09-14 | 2023-03-14 | 逸兴泰辰技术有限公司 | Crossing traffic light passing time adjusting system |
| CN113920730A (en) * | 2021-10-11 | 2022-01-11 | 北京易华录信息技术股份有限公司 | Signal lamp time distribution method and device, electronic equipment and storage medium |
| CN113947927A (en) * | 2021-12-06 | 2022-01-18 | 文思海辉智科科技有限公司 | Adjusting method and device for traffic signal lamp timing |
| CN115273499A (en) * | 2022-06-30 | 2022-11-01 | 华东师范大学 | Traffic flow-based signal lamp dynamic timing method and system |
| CN115273499B (en) * | 2022-06-30 | 2023-11-10 | 华东师范大学 | Traffic flow-based signal lamp dynamic timing method and system |
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