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A Method for Determining Vehicle Queue Length Based on Saturation Flow Rate Redundancy Curve

A curve and redundancy technology, applied in the field of vehicle queuing length determination based on the saturation flow rate redundancy curve, can solve problems such as dependence and heavy workload, and achieve the effects of satisfactory accuracy, simple method and low computing efficiency

Active Publication Date: 2018-03-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is labor intensive and depends on the chosen traffic flow model

Method used

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  • A Method for Determining Vehicle Queue Length Based on Saturation Flow Rate Redundancy Curve
  • A Method for Determining Vehicle Queue Length Based on Saturation Flow Rate Redundancy Curve
  • A Method for Determining Vehicle Queue Length Based on Saturation Flow Rate Redundancy Curve

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] figure 1 is a road map. Vehicles entering the road section are expressed by the cumulative vehicle number curve, and the cumulative vehicle number curve N(t) represents the total number of vehicles entering the road section from time 0 to time t. The exit of the road is controlled by signals, and the signal parameters are expressed by a series of red and green time lengths. r k and g k Indicates the duration of the red light and the duration of the green light of the kth cycle.

[0023] figure 2 For the vehicle space-time trajectory map and the queuing change map, the queuing changes in several cycles are given. The abscissa is time, and the ordinate is distance. Vehicles enter the road section from the upper part and exit from the lower part. The abscissa indicates the sequence of traffic light cycles. In the kth cycle, because there is no q...

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Abstract

The invention discloses a vehicle queue length determining method based on a saturation volume rate redundancy curve. By adopting the method, a length of a vehicle queue on a city road is acquired. Dynamic traffic flow input is received, and a saturation volume rate redundancy curve is constructed, and by using a saturation volume rate redundancy curve diagram, an accumulated curve diagram, and a vehicle track spacetime diagram, the length of the vehicle queue in every period is solved. The condition of the vehicle queue changing along with time is acquired, and a vehicle queue overflow condition is also under consideration.

Description

technical field [0001] The invention relates to a method for obtaining queuing length used in urban traffic management, in particular to a method for determining vehicle queuing length based on a saturated flow rate redundancy curve. Specifically, it involves using a specially designed graph to deduce the queuing on the main road in the city. Background technique [0002] Queuing on urban roads is an important reference standard for traffic management and one of the goals of traffic management. The queue length of vehicles varies with time. Traditionally, traffic flow models have been used to numerically simulate queuing at fixed time intervals, or to calculate the farthest points in queuing. This approach is labor-intensive and dependent on the chosen traffic flow model. Contents of the invention [0003] In order to overcome the defects of existing methods, the present invention proposes a method for determining vehicle queuing length based on saturated flow rate redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08G1/01
CPCG08G1/0104G08G1/0125
Inventor 祁宏生王殿海
Owner ZHEJIANG UNIV