Real-time estimation method for turning proportion of level crossing of urban roads

It is a technology of steering ratio and plane crossing, which is applied in calculation, data processing application, forecasting, etc. It can solve problems such as difficulty in obtaining actual data, difficulty in meeting the real-time optimization requirements of signal timing parameters, and complex model construction process.

Inactive Publication Date: 2015-12-30
SOUTHEAST UNIV
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Problems solved by technology

[0003] At present, a large number of researches have been carried out on the estimation method of steering ratio at intersections at home and abroad. The estimation method based on balance theory and the estimation method based on distribution theory have been proposed continuously. The former is purely from a mathematical point of view, ignoring the volatility and randomness of traffic conditions. , so it cannot be applied to real-time signal timin

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  • Real-time estimation method for turning proportion of level crossing of urban roads
  • Real-time estimation method for turning proportion of level crossing of urban roads
  • Real-time estimation method for turning proportion of level crossing of urban roads

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[0111] like figure 1 As shown, the steps of the present invention are as follows:

[0112] Step a. Numbering i,j (i=1,2,...,n; j=1,2,...,n) for the entrance and exit of the intersection in the same direction (counterclockwise);

[0113] Step b. Obtain the collection cross-sections of the downstream sections corresponding to the n entrances and n exits of the target intersection and the traffic flow data at 15-minute intervals {x 1 (t)x 2 (t)...x i (t)...x n (t)}{y 1 (t)y 2 (t)...y j (t)...y n (t)};

[0114] Step c. Matrix the unknown variable steering ratio and the traffic flow data obtained in step b to obtain: X t =[X 1 (t)X 2 (t)...X i (t)...X m (t)], Y t =[y 1 (t)y 2 (t)...y j (t)...y n (t)]′

[0115] A t =[a 12 (t)a 13 (t)...a 1n (t)a 21 (t)a 23 (t)...a 2n (t)...a n1 (t)a n2 (t)...a n(n-1) (t)] T

[0116] Step d. Establish the observation equation of the Kalman filter model for steering ratio estimation according to the flow conservation of ...

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Abstract

The invention discloses a real-time estimation method for the turning proportion of a level crossing of urban roads. The method comprises that sectional traffic flow data of an entrance lane of the crossing and traffic flow data of a downstream road corresponding to an exit lane of the crossing are obtained, the flow deviation mode between the exit lane and the downstream road thereof is analyzed, and a Kalman filtering model for turning proportion estimation is established. According to flow conservation of the entrance and exit lanes of the crossing and random roaming of flow deviation, an observation equation of the Kalman filtering model for turning proportion estimation is established; according to the continuity and smoothness of short-period fluctuation of the turning proportion, a state equation of the Kalman filtering model is established; and the turning proportion of the crossing is estimated in real time by utilizing the Kalman filtering algorithm. The substantial random fluctuation mode of flow deviation between the exit lane of the crossing and the downstream road of the exit lane is fully dug, and accurate real-time turning proportion information of the traffic flow of the crossing can be provided for design and optimization of crossing signals of the urban roads.

Description

technical field [0001] The invention relates to a method for estimating a road turning ratio, in particular to a real-time estimating method for a turning ratio at an urban road plane intersection. Background technique [0002] Signaled intersection is an important node for controlling and dredging the traffic flow of urban road network. Reasonable real-time optimization of signal timing is an important guarantee for realizing optimal control of signalized intersection. The traffic flow in different directions at the entrance of the intersection is an important basis for the real-time optimization of the signal timing of the intersection. How to estimate it accurately and in real time has always been one of the key technologies in the research on the signal timing of the intersection. The estimation of the traffic flow by direction at the entrance of the intersection can generally be transformed into the estimation of the steering ratio of traffic flow at the entrance of the...

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Application Information

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IPC IPC(8): G06Q10/04
Inventor 陆振波夏井新李潇逸聂庆慧焦甜甜张伟安成川吕伟韬
Owner SOUTHEAST UNIV
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