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Self-adaptive algorithm for intersection signal lamp duration control

A self-adaptive algorithm and intersection technology, applied in the control of traffic signals and other directions, can solve the problems of increased work intensity, inflexibility, and balanced passage of vehicles on difficult roads, and achieve the effect of improving traffic efficiency and rational distribution.

Active Publication Date: 2020-06-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (2) When the traffic flow on the road is relatively large, it is difficult to achieve a balanced passing time of road vehicles in all directions at the intersection by man-made traffic control, resulting in unreasonable contradictions in the passing time of each direction
[0009] (3) Human directing traffic needs to observe the traffic flow at the intersection at all times, but human energy is limited, and long-term concentration of energy will make people overtired and work intensity will increase, and each intersection needs someone to direct , resulting in high labor costs
However, there is a very prominent inflexibility. No matter whether there is a car or not in the other direction, it needs to wait for a cycle, which is quite inefficient.

Method used

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  • Self-adaptive algorithm for intersection signal lamp duration control
  • Self-adaptive algorithm for intersection signal lamp duration control
  • Self-adaptive algorithm for intersection signal lamp duration control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Example 1: Such as figure 1 , 2 As shown, an adaptive algorithm for controlling the duration of traffic lights at intersections includes the following steps:

[0101] Step 1: Re-adjust the duration of the east-west and north-south directions while ensuring that the sum of the east-west and north-south durations of the intersection remains unchanged, including the following two situations:

[0102] (1) If the absolute value of the efficiency difference between the two directions is less than d%, do not adjust and proceed directly to step 2;

[0103] (2) If the absolute value of the efficiency difference between the two directions is greater than or equal to d%, make adjustments: the duration of the side with the higher traffic efficiency value decreases, and the duration of the side with the lower traffic efficiency value increases; On the basis of adjusting the fixed duration in the north-south direction, according to the previous adjustment interval m, the original allocatio...

Embodiment 2

[0184] Example 2: Set the north-south and east-west directions of the intersection, the current fixed time length is Tn=60, Te=60s, and the straight travel time (south-north, east-west) in an adjusted interval of m in each direction is Ts=40s, (south-north, East-west) Turn left time is Tl=20s; and set that all the following traffic efficiency values ​​are statistics within m=30 minutes, the efficiency difference comparison value d%=10%, η_n=40%, η_e=35%; north-south direction : Η_s=40%, η_l=36%; east-west direction: η_s=45%, η_l=40%; at this time

[0185] |η_n-η_e| <10%; north-south direction: |η_s-η_l| <10%; east-west direction: |η_s-η_l| <10%

[0186] Therefore, the fixed duration in all directions will not be adjusted

[0187] among them:

[0188] η_n: the traffic efficiency value in the north-south direction calculated during the last adjustment interval m

[0189] η_e: the traffic efficiency value in the east-west direction calculated during the last adjustment interval m

[0190]...

Embodiment 3

[0192] Example 3: Set the north-south and east-west directions of the intersection, the current fixed time length is Tn=60, Te=60s, the straight travel time for an adjusted interval of m in each direction is Ts=Ts_old=40s, that is, the left turn time is Tl =Tl_old=20s; and set that all the following traffic efficiency values ​​are calculated within m=30 minutes, the efficiency difference comparison value d%=10%, η_n=40%, η_e=35%; north-south direction: η_s=33% , Η_l=50%; east-west direction: η_s=50%, η_l=33%; at this time |η_ n -η_ e | s -η_ l |> 10%; east-west direction: |η_ s -η_ l |> 10%;

[0193] Therefore, no adjustments will be made in the east-west and north-south directions;

[0194] The process of adjusting the length of straight and left turns in the north-south direction is as follows:

[0195] Now η_s <η_l,

[0196]

[0197] T s_new = T s_old +ΔTs=40+2=42s

[0198] T l_new = T l_old -ΔTs=20-2=18s

[0199] Where:

[0200] ΔTs: the time to readjust when going straight and t...

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Abstract

The invention discloses a self-adaptive algorithm for controlling and adjusting the duration of intersection signal lamps, and belongs to the field of traffic light control. In an intersection signallamp fixed duration control mode, the total control duration of each direction of an intersection or the control duration of straight going and left turning in the same direction is intelligently adjusted through an adaptive algorithm according to traffic efficiency value data provided by an intersection database statistical table. The algorithm mainly comprises the following steps: judging the absolute value of the difference of efficiency values in different directions, and adjusting the passing duration control within a certain ratio difference value; and adjusting the control duration of straight going and left turning in the same direction. Through the algorithm, the duration control of the intersection signal lamp can be intelligently adjusted, and the waiting time is reduced, so thepassing efficiency is improved, and the emission and idling oil consumption are reduced.

Description

Technical field [0001] The invention relates to an adaptive algorithm for controlling the time length of intersection signal lights, and belongs to the field of intelligent control of intersection signal lights Background technique [0002] At present, the control method of urban intersection signal lights is based on the fixed duration control mode (hereinafter referred to as the fixed mode). Its characteristic is that regardless of whether there is a car or no car on the road in each direction of the intersection, the signal lights are controlled according to the set duration. Control to instruct vehicles to pass or not pass. [0003] At intersections with crowded vehicles (city center or busy traffic section or peak traffic period), this fixed mode control should be said to be effective. However, at intersections where vehicles are sparse (new urban construction areas or non-busy traffic sections or non-peak traffic periods), this control method is effective but inefficient. [...

Claims

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Application Information

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IPC IPC(8): G08G1/07
CPCG08G1/07
Inventor 张力康彦丰谢发荣王振超李非杨志芳王煦童司徒炜豪吕创陈宇星赵阳殷润达汤礼欣陆婷施敬磊
Owner KUNMING UNIV OF SCI & TECH
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