An Estimation Method of Intersection Timing Scheme Based on Electric Police Checkpoint Data

A technology for intersections and electric police cards, which is applied to the traffic control system of road vehicles, traffic control systems, instruments, etc., and can solve problems such as deviation of timing schemes, rare full parameters of timing schemes, and inability to obtain signal timing schemes, etc. , to reduce the error, shorten the time span, and avoid the effect of overestimation error

CN112201061BActive Publication Date: 2021-09-03TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-09-03

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Abstract

The invention relates to a method for estimating an intersection timing scheme based on electric police bayonet data, comprising the following steps: 1) constructing a two-layer programming problem model for estimating an intersection timing scheme; Constraints for signal ratio estimation; 3) For all possible phase combinations of the controlled flow direction, define dummy variables that characterize the relationship between the turn-on sequence and the length of the green light in the straight flow direction and left-turn flow direction, and obtain the constraint conditions of the phase structure; 4) Combining the constraints of period length, phase difference, phase structure and green signal ratio estimation, the least square method is used to solve the bilevel programming problem of intersection timing scheme estimation, and the final estimated timing scheme is obtained. Compared with the prior art, the present invention has the advantages of full parameter estimation, high estimation precision, wide applicability and the like.
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Description

technical field

[0001] The invention relates to the technical field of traffic operation signal timing, in particular to a method for estimating an intersection timing scheme based on electric police bayonet data. Background technique

[0002] As a sign of discontinuous flow, the signal timing scheme makes the traffic flow have periodic characteristics in the time dimension. It is an important input in estimating traffic operation evaluation indicators such as queue length and delay, and it is also an optimization problem when optimizing signal control. Decision variables, although the current signal control field has developed to the stage of induction control and adaptive control (such as SCOOT, SCATS, etc.), the multi-period timing control mode still occupies a dominant position in most countries and regions. However, in practice, due to the clock offset of the detection system or human intervention, the accurate signal timing scheme is often not available, or there is a ...

Examples

Embodiment

[0085] like Figure 4 As shown, the present invention provides a method for estimating the timing scheme of an intersection based on bayonet electric police data, comprising the following steps:

[0086] 1) Acquire the passing data of the electric police bayonet detectors in the lanes where all the controlled flow directions are located at the intersection, preprocess to obtain the headway sequence of all the controlled flow directions and the arrival feature vector of the vehicle, and perform k -means clustering to obtain a rough estimate of the cycle length and the corresponding initial cycle passing point set, and define the constraints of the cycle length and phase difference estimation;

[0087] 2) For all possible phase combinations of the controlled flow direction, by defining dummy variables that characterize the relationship between the turn-on sequence of the green light time and the length of the green light in the straight flow direction and the left-turn flow dire...