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Preemption control method for emergency vehicles at T-junction based on timed Petri net

A technology of emergency vehicles and control methods, which is applied to the traffic control system of road vehicles, control traffic signals, traffic control systems, etc., can solve problems such as emergency vehicle preemption, and achieve the effects of avoiding conflicts, reducing conflicts and shortening time.

Inactive Publication Date: 2019-04-09
NANJING UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method that can solve the control problem of emergency vehicle preemption at T-shaped intersections, and then improve the traffic efficiency of T-shaped intersections

Method used

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  • Preemption control method for emergency vehicles at T-junction based on timed Petri net
  • Preemption control method for emergency vehicles at T-junction based on timed Petri net
  • Preemption control method for emergency vehicles at T-junction based on timed Petri net

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Embodiment

[0048] combine figure 1 , the present invention is based on the T-shaped intersection emergency vehicle preemption control method of timed Petri net, comprises the following content:

[0049] Step 1. Set the maximum capacity value K(p)=1 of all places in the Petri net to ensure that there is a control effect between places.

[0050] Step 2. According to the state of the traffic light when the emergency vehicle arrives at the T-shaped intersection, different emergency scenarios are divided, including 9 kinds of emergency scenarios, which are divided into immediate emergency scenarios and indirect emergency scenarios, wherein:

[0051] A. Immediate emergency scenarios, including the following 5 types: (R sw , G we , R es ), (R sw , R we , G es ), (Y sw , R we , R es ), (R sw , R we , R es ) and (R sw , R es , R we ); where (R sw , R we , R es ) when R we will turn green, (R sw , R es , R we ) when R es will turn green.

[0052] B. Indirect emergency scena...

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Abstract

The invention discloses a preemption control method for emergency vehicles at a T-junction based on a timed Petri net, which comprises the following steps: firstly, setting the maximum capacity valuesof all warehouses in the Petri net; then, obtaining different emergency scenes according to the traffic light state when the emergency vehicles arrive at the T-junction; then, establishing Petri netmodels corresponding to the different emergency scenes by using the timed Petri net; and finally, combining the Petri net models corresponding to the different emergency scenes to construct a preemption control system for emergency vehicles at a T-junction, which realizes the preemption control on emergency vehicles at T-junction. The method generates a collision-free preemption control system foremergency vehicles by taking a T-junction based on a three-phase control technology as an object and using the timed Petri net models as a modeling and analysis tool, can effectively avoid the collision of the emergency vehicles at the T-junction, improve the traffic efficiency of intersections, and effectively shorten the time required for emergency vehicles to reach the destination.

Description

technical field [0001] The invention belongs to the technical field of traffic safety control, in particular to a T-shaped intersection emergency vehicle preemption control method based on timed Petri nets. Background technique [0002] Emergency Vehicle Preemption (EVP) systems are designed to provide emergency vehicles with a green light to enter an intersection while providing others with a red light. There are many EVP technologies in use today, including light, infrared, sound, and radio-based emitter / detector systems. In addition, the article "BEVOR: An NTCIP-based interoperable framework emergency vehicle preemption system using web service and STMF" proposes ITS middleware for emergency vehicle preemption based on ITS protocol-based National Traffic Communication (NTCIP). By using the NTCIP protocol at the communication layer, communication and data interoperability can be achieved between most devices and devices. A mechanism is proposed in the article "A centrali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/07G08G1/083G08G1/16
CPCG08G1/07G08G1/083G08G1/166
Inventor 黄波赵志霞赵凌波裴焱栋蔡志成
Owner NANJING UNIV OF SCI & TECH
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