Design And Verification Of Train Route Control Method In Onboard-centered Train Control System

The onboard-centered train control system is a new train control system for the western region of China,which is currently under theoretical study and scheme design.In order to meet the needs of the regional railway in reducing ground equipment costs and improving onboard equipment capability,such advanced technologies as satellite positioning,multi-mode communication and flexible adaptation of transport capacity have been adopted.The new train control system has three important features,namely direct train-to-train communication,onboard calculation of movement authority calculation and onboard autonomous route control.Regarding the onboard autonomous route control,this thesis uses the onboard decentralized train autonomous route control to replace the ground centralized interlock for studying the train route control method.The main work accomplished in the thesis is as follows:(1)The onboard-centered train route control method was designed.Starting from the technical principles of the onboard-centered train control system and the basic technical rules of route control,the requirements of onboard-centered train route control was analyzed,and according to the structure of the new train control system and the interaction between the modules,the train route control subsystem was designed.After that,according to train operation scenarios the route control process was divided into four stages including receiving and parsing of traffic plan,determination of timing for route triggering,train route building and train route release,for each of which the detailed control flow was designed.Considering the changes in the route control process and the basic equipment involved,the route protection logic was divided into the protection logic in the route equipment layer and that in the route equipment relationship layer,for each of which the supplemental design was conducted.Finally,the onboard-centralized train route control method and the ground centralized interlocking were compared in terms of similarities and differences.(2)An overall framework for modeling and analysis of onboard-centralized train routing control method was established.Combining the characteristics of UML and CPN modeling languages,the top-down hierarchical modeling method and the refinement strategy of gradually incorporating route protection logic and gradually improving station elements and time factors were adopted,and a train route control modeling method combining the route control process and protection logic was proposed.On this basis,the CPN Tools was used to finish the process of logic function verification,state space analysis and time performance analysis of the route control model,thus an overall framework for modeling and analysis of onboard-centralized train routing control method was constructed.(3)Modeling and simulation analysis of the route control method was conducted.According to the design of onboard-centered route control process,and by using the overall route control modeling framework and the UML-to-CPN model conversion rules,the train route control HCPN model,the HCPN model for single-train route control scenario and the TCPN model for multi-train route conflict scenario were built.After that,the route control analysis framework was used to perform the logic function verification and state space analysis for the route control HCPN models,to verify the functionality and correctness of the model,and thus to achieve the function verification of the route control method.Then the single-step simulation analysis of the TCPN model was carried out,during which the potential "resource competition problem" in the multi-train route control process was identified.(4)A method for solving the resource competition problem is proposed.Regarding the potential resource competition problem identified in the process of multi-train route control,the objective function of route conflict resource allocation was put forward according to the basic principles of train route operation,and a route resource allocation algorithm under the condition of centralized OC was proposed by using ODP3 main protocol algorithm and ACT technique.Through algorithm simulation analysis,it has been verified that this algorithm can not only effectively avoid the resource competition problem,guaranteeing the ordered execution of train route operation according to priority,but also improve the efficiency of train route resource acquisition under multi-train route control scenario.There are 64 graphs,40 tables and 70 references in this thesis.