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Hidden Markov chain based intersection real-time saturation flow rate estimation method

A technology of intersection and flow rate, which is applied in traffic flow detection, road vehicle traffic control system, traffic control system, etc., can solve the problem of inability to accurately estimate the saturation flow rate of intersection entrance road in real time

Active Publication Date: 2017-06-13
ZHEJIANG UNIV
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defect that the existing method cannot accurately estimate the saturation flow rate of the intersection entrance in real time

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  • Hidden Markov chain based intersection real-time saturation flow rate estimation method
  • Hidden Markov chain based intersection real-time saturation flow rate estimation method
  • Hidden Markov chain based intersection real-time saturation flow rate estimation method

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0012] figure 1 Set up the graph for the detector of the stop line. Wherein, the detector is arranged at the stop line, so that each vehicle can be detected by the stop line after passing the stop line. figure 2 is the calculation method of the headway, and the time difference between adjacent vehicles passing the stop line is used as the detection value of the headway. image 3 When the green light of the signal light is turned on, the change diagram of the headway of the vehicle passing the stop line under ideal conditions. At the initial stage of the green light, the headway is relatively large due to the vehicle’s acceleration is not yet complete. As the subsequent vehicles pass by, the vehicle speed gradually increases, so the headway becomes smaller and smaller until the fifth or sixth car. The headway is basically stable, and this stable head...

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Abstract

The invention discloses a hidden Markov chain based intersection real-time saturation flow rate estimation method. The method includes steps of a, collecting traffic flow data, including time headway itself, influencing saturation time headway; b, training parameters of a hidden Markov chain model through the collected traffic flow data; c, performing real time collection on time headway in front of a stop line of the intersection, estimating a hidden time headway state behind a time headway sequence and obtaining a continuous stable time headway sequence; d, averaging the stable time headway sequence and utilizing the reciprocal of the average value as the saturation flow rate corresponding to the stop line. The method provided by the invention can be used for real time estimation of the saturation flow rate and provides parameter basis for traffic control.

Description

technical field [0001] The present invention relates to a method for estimating the real-time saturated flow rate of an intersection in urban traffic control, specifically, it involves using detector data and signal light information to model the state of headway at the intersection, and A method of training a model and then using the model to estimate the saturation flow rate in real time. Background technique [0002] The saturation flow rate is one of the key parameters in the urban traffic control system, which refers to the flow rate when the fleet passes the stop line in a saturated state after the green light signal of the signal light is turned on. The flow rate varies with time and space, and largely affects the control effect of the intersection. At present, most mainstream control systems use a fixed saturation flow rate or simply use quantiles to set the saturation flow rate. This relatively rigid approach is difficult to reflect the actual situation. Therefor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/01
CPCG08G1/0116G08G1/0125
Inventor 祁宏生罗玉芳江南唐守鹏崔岩磊王殿海
Owner ZHEJIANG UNIV
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