Intersection signal timing optimization method based on dynamic saturation flow rate
A technology of signal timing and optimization method, which is applied in the traffic control system of road vehicles, traffic flow detection, traffic control system, etc., and can solve the problems of invalid timing scheme and unreasonable optimization of the objective function
Active Publication Date: 2020-12-04
SHANDONG UNIV OF TECH +1
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However, through actual observation, it is found that due to the difference in intersection channelization design and traffic status, parameters such as saturated flow rate and lost time will change accordingly, which leads to the failure of the optimization objective function and the unreasonable timing scheme
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[0032] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail;
[0033] The steps of the inventive method comprise:
[0034] A) First establish the dynamic saturated flow rate vehicle release model at the intersection
[0035] a) Analyze traffic flow characteristics
[0036] When the green light at the intersection is on, the vehicles waiting behind the stop line will pass through the intersection in sequence. According to the release rate, the release process is divided into three stages and five states: red light state (OA); Release state of inner queuing vehicles (AB); saturated release state of queuing vehicles outside the channelization section (BC); non-saturated release state of queuing vehicles outside the channelization section (CD); random arrival release state (DE); figure 1 , figure 2 and image 3 shown. Each operating state will be analyzed in depth below to determine the state duration and correspo...
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The invention relates to an intersection signal timing optimization method based on a dynamic saturation flow rate. The method comprises the following steps: firstly, carrying out refined analysis ontraffic flow release characteristics of a high-load intersection, and determining the maximum release flow rate and duration of five stages; secondly, proposing a calculation model of the total loss time of the intersection, and taking the calculation model as an optimization target of high-load intersection signal timing; and then, constructing an optimization model of the signal period and the green light based on the optimization indexes, so that the optimal signal period and the optimal green light duration under the condition are more accurate. According to the method, the dynamic saturation flow rates of the intersection entrance lane in different time periods can be accurately calculated according to the parameters such as the length, the traffic volume and the acceleration of the intersection channelization section, the vehicle release rule in the intersection green light period is truly displayed, and the optimal period and the optimal green light time are calculated accordingly. According to the method, the problem of cycle time surplus caused by the fact that a saturation flow rate fixed value is adopted in traditional timing model calculation in a high-load state can besolved.
Description
technical field [0001] The invention relates to the field of traffic signal control, in particular to a method for calculating the period of a dynamic saturated flow rate signal at an intersection. Background technique [0002] In the traditional signal timing model, it is assumed that the saturated flow rate and loss time of the entrance lane group are fixed values, and the traffic flow is used as an input variable to optimize the signal cycle and green light time, so as to achieve the minimum delay and saturation. However, through actual observation, it is found that due to the difference in channelization design and traffic conditions at intersections, parameters such as saturated flow rate and lost time will change accordingly, which leads to the failure of the optimization objective function and the unreasonable timing scheme. For this reason, the present invention proposes the calculation model of the release flow rate and the lost time of the intersection by analyzing...
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Login to View More IPC IPC(8): G08G1/01G08G1/083G08G1/095
CPCG08G1/0104G08G1/0137G08G1/083G08G1/095
Inventor 孙锋许阳李大龙李波张荣基孙猛林飞王晓琳宋子文李衬衬
Owner SHANDONG UNIV OF TECH