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

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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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 timing requirements; although the latter introduces a real-time traffic flow distribution model, since this type of method starts from the road network level, the model construction process is very complicated, and the large amount of actual data required is difficult to obtain , so it is mostly implemented by means of simulation, and the theoretical research results are difficult to meet the real-time optimization requirements of signal timing parameters

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