Macroscopic traffic flow parameter estimation method for urban expressway

A macroscopic traffic flow and parameter estimation technology, which is applied in the field of macroscopic traffic flow parameter estimation of urban expressways, and can solve problems such as incompliance, traffic congestion, and impact on ARZ model estimation accuracy.

Active Publication Date: 2019-03-01
BEIJING UNIV OF TECH
View PDF10 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The ARZ model describes the macroscopic traffic flow state well in mathematical form, but in previous studies, the model is usually solved in a fixed mode (free or congested), which is obviously not realistic The situation greatly affects the estimation accuracy of the ARZ model in the estimation of macroscopic traffic flow parameters, and it is easy to cause the

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Macroscopic traffic flow parameter estimation method for urban expressway
  • Macroscopic traffic flow parameter estimation method for urban expressway
  • Macroscopic traffic flow parameter estimation method for urban expressway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0075] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only the present invention. Some, but not all, embodiments are invented. Based on the embodiments of the invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0076] In particular, the terms "vehicle α" and "time t" in the description and claims of the present invention and the above drawings are used to refer to objects that meet specific conditions, not to a specific object, and should be understood as The data used by this type of object can be changed in order, etc. under appropriate circumstances, so that the embodimen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a macroscopic traffic flow parameter estimation method for an urban expressway. According to the method, a random macroscopic traffic flow model is used for carrying out parameter estimation on an urban expressway, wherein the estimated parameter has an average road density and an average road speed. The method mainly comprises two parts: model establishment and parameter estimation. The model estimation is carried out by three steps: model theory framework construction, determination of various parameters of the model and a system matrix, and determination of a model modal transfer rate matrix. According to the parameter estimation, a random distribution value of the traffic state of the road segment at any time interval is obtained by using the transfer rate matrix; the random value of a road section traffic state at a current time and a macro traffic flow parameter are substituted into the model; and a traffic flow parameter of the road section at a next timeis estimated. Therefore, objectives of carrying out navigation for a driver and providing an information support for the traffic manager are achieved.

Description

technical field [0001] The invention belongs to the field of intelligent transportation, and in particular relates to a method for estimating macroscopic traffic flow parameters of urban expressways. Background technique [0002] With the rapid improvement of people's living standards, people's demand for transportation is increasing. Cars are especially favored by travelers because of their fast speed and the characteristics that the destination can be freely selected according to travel needs. [0003] With the rapid increase in the number of motor vehicles in cities, the construction speed of traffic facilities cannot catch up with the growth rate of motor vehicles, and urban congestion is becoming more and more serious. Urban expressways, as the main roads for urban traffic operations, have particularly serious congestion. [0004] The complex traffic state of urban expressway also makes its traffic flow state change from the original single free or congested state to th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G08G1/01
CPCG08G1/0125
Inventor 张利国张训寿
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap