Emergency ambulance priority pass modeling method based on Petri network

Abstract

The invention discloses an emergency ambulance priority pass modeling method based on a Petri network. The method includes the steps of: (1) combining concepts of a time Petri network, a synchronization Petri network and an inhibitor arc, and proposing a definition of a time synchronization Petri network; (2) based on the time Petri network, establishing a two-phase intersection normal state modelwhich is used for simulating conversion of traffic lights of an intersection; (3) verifying the correctness of the normal state model through HPSim software and a reachability graph analytical method; (4) on the basis of the normal state model, and based on the Petri network, establishing a two-phase intersection emergency ambulance priority pass model which visually describes a variation situation of the traffic lights when the emergency ambulance reaches the intersection, facilitates analysis and verification, and is easy to realize; and (5) verifying the correctness of the emergency ambulance priority pass model through the HPSim software and the reachability graph analytical method.

Description

technical field [0001] The invention relates to a Petri net modeling method, in particular to a Petri-based modeling method for solving emergency vehicle priority driving. Background technique [0002] For the ambulance, the signal control of the intersection under normal conditions will delay its journey, and its right of priority cannot be guaranteed. In domestic and foreign studies, most of the priority traffic strategies at intersections are for buses, but less for ambulances. However, an ambulance is fundamentally different from a bus: an ambulance has a higher priority than a bus. Therefore, the intersection signal control strategy of public transport vehicles is not suitable for emergency vehicles. The priority of public transport vehicles belongs to the category of signal priority, while the priority of emergency vehicles belongs to the category of mandatory priority. [0003] In addition, domestic and foreign researches on the priority passage of ambulances at int...

AI Technical Summary

Problems solved by technology

The disadvantage of the existing priority traffic light system for ambulances is that if the switching control of the signal light is not properly controlled, it may lead to a lack of response to the lateral traffic flow, which may lead to collision hazards

At the same time, it does not take into account the traffic congestion at the intersection. If the corresponding priority measures are implemented at the time when the ambulance arrives, it may cause a certain delay due to the obstruction of the congested vehicles in front of the ambulance.

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