Cell transmission simulation model improved method aiming at variable speed limit control

Abstract

A cell transmission simulation model improved method aiming at variable speed limit control comprises the following steps: firstly detecting traffic flow density, flow rate and speed of certain section of rapid road comprising inlet / outlet ramps; using the optimal linearity fitting method to respectively fit data so as to obtain a traffic flow basic map containing dropping pass capability under variable speed limit control; determining traffic demands of a main line origin and inlet / outlet ramps in each period according to the real time traffic flow data; using two types of basic maps to respectively calculate the maximum vehicle number flowing in / out each cell in each simulation step, and updating traffic flow, density and speed in each cell. A basic cell transmission model is overly simple in hypothesis, and cannot consider variable speed limit control influences; the novel improved method can solve said problems, and can simulate variable speed limit control influences on the traffic flow operation under the bottleneck area pass capability dropping condition, jam traffic flow stopping and going phenomenon, and different driver compliance levels, thus providing basis for calculating (simulation-based) variable speed limit control influences on traffic safety and efficiency.

Description

technical field [0001] The invention belongs to the technical field of traffic simulation, and in particular relates to an improved method for a cellular transmission simulation model for variable speed limit control. Background technique [0002] Traffic simulation is an important tool to study complex traffic problems. It can describe the operation of traffic flow through a certain mathematical model, which can dynamically and accurately simulate the operation law of traffic flow, and reproduce the temporal and spatial variation characteristics of traffic flow. As a differential discrete form of kinematic model, the cellular transport model is widely used to simulate the operation of expressway traffic flow, but its basic assumptions are too simple, and the secondary development of it can accurately simulate key traffic flow characteristics and Phenomenon. At the same time, as more and more expressways adopt the dynamic traffic control strategy of variable speed limit con...

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Problems solved by technology

[0004] The problem to be solved by the present invention is: as a model widely used in the simulation of traffic flow operation on expressways, the basic cellular transport model can simulate the generation and propagation of traffic jams on expressways, but the basic model cannot simulate traffic on expressways. Ability decline and timely stop-and-go traffic flow characteristics, and it is impossible to directly simulate the impact of variable speed limit control on traffic flow under different driver compliance

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