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Real-time estimation method for city canyon street motor vehicle pollutant emission and dispersion

A pollutant discharge and urban canyon technology, which is applied in the traffic control system of road vehicles, computing, special data processing applications, etc., can solve the problem that it is difficult to accurately and real-time determine the concentration of environmental pollutants in urban canyon streets, and achieve real-time improvement. efficiency and accuracy, accuracy of emission factor data, effects of improved accuracy and reliability

Inactive Publication Date: 2016-03-23
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Due to the differences in time and space conditions and the dependence on meteorological conditions, it is difficult to determine the concentration of environmental pollutants in urban canyon streets in real time and provide accurate values ​​for travelers

Method used

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  • Real-time estimation method for city canyon street motor vehicle pollutant emission and dispersion
  • Real-time estimation method for city canyon street motor vehicle pollutant emission and dispersion
  • Real-time estimation method for city canyon street motor vehicle pollutant emission and dispersion

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] The first part is traffic modeling and simulation. The invention firstly models and simulates the urban road network based on the CTM model.

[0047] Space and time are discretized according to the CTM model. Space discretization is the cell division method, which divides the street section into multiple cells with the same length, and at the same time divides the time into equal time intervals as the time step, and satisfies that within one time step, the vehicle travels at the maximum speed The distance traveled is less than the cell length. Cell division method of the present invention is: select cell length to be 1 meter, time interval is t second, l generally gets 20, t generally gets 1. The specific division steps are as follows:

[0048] (1) Divide the target area into n links with intersections and area boundaries as nodes, and each link is divided i...

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Abstract

The invention provides a city canyon street pollutant real-time estimation method to estimate concentration values of different pollutants mainly generated by motor vehicle tail gas emission in a city canyon street in real time. According to the method, a model is used for simulating the road traffic state, and traffic parameters are estimated in real time; in combination with emission factors of a motor vehicle, road pollutant emission is estimated; a dispersion model is used for estimating pollutant dispersion concentration in street air in real time; finally, the calculated pollutant concentration values are displayed on a map in real time. According to the method, a GPS module of a smartphone is utilized for being combined with a VSP module to calculate the motor vehicle emission factors, the real-time property and accuracy of the model are improved in a convenient and low-overhead mode, and by means of a map interface, the calculation result is converted into intuitive and visual pollutant concentration data for users to refer to.

Description

technical field [0001] The invention belongs to the field of intelligent transportation systems, and relates to road traffic simulation, motor vehicle exhaust emission and the diffusion of pollutants in urban canyon roads. Due to differences in time and space conditions and dependence on meteorological conditions, it is currently difficult to accurately and real-time understand the concentration of pollutants in the road environment . The invention combines a traffic model, a pollutant discharge model and a diffusion model to estimate the concentration of air pollutants in urban canyon streets in real time. Background technique [0002] With the sustained and rapid economic development, the number of motor vehicles in my country's cities has shown a substantial increase. Subsequently, urban traffic congestion is increasing day by day, and motor vehicle exhaust pollution is serious. Motor vehicle exhaust emissions are closely related to the quality of the urban air environm...

Claims

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Application Information

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IPC IPC(8): G06F17/50G08G1/01
CPCG06F30/367G08G1/0104
Inventor 张利国许超刘慧超
Owner BEIJING UNIV OF TECH
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