| With the increasing passenger flow pressure of urban rail transit,the number of domestic cities with an average daily passenger flow of more than one million passengers has reached 12,and the bottleneck of line capacity has emerged.Through the civil engineering structure and vehicle transformation scheme to improve the carrying capacity,the transformation cost is high and the construction is difficult.Therefore,the scheme of upgrading the train control system to improve the line capacity is gradually recognized by the industry.At present,the mainstream train control technology of urban rail transit in China is communication based train control(CBTC).However,most ctbc technologies are based on interlocking routes,and mobile authorization must be within the scope of authorized interlocking routes.The interlocking route is based on annunciator and track section,so the utilization of line resources is large and the efficiency is limited.Train to train communication train control technology abandons some traditional interlocking concepts,takes the train as the core control object,manages the line as a resource,and controls the line in the mode of resource requisition by the train.The technical concept is advanced,and there are engineering cases at home and abroad.At present,although there is a consensus in the industry on the improvement of train communication and train control system,there is no in-depth quantitative research.By studying and analyzing the principle of train train communication and train control system and the technical advantages of the safety model,and then simulating and calculating the working conditions of typical lines and vehicles,this paper compares the main line tracking ability and turn back ability of CBTC system and train communication system,and summarizes the specific impact of train communication and train control system on the urban rail transit capacity compared with the traditional CBTC system:(1)The train to train communication system adopts the safety protection tracking model of relative position and speed,and cooperates with each other to ensure safe braking.Compared with the traditional CBTC,it has greater technical advantages,and the tracking capacity of the main line is increased by about 5S.(2)The train to train communication system further refines the division and utilization of line resources,refines the grain of turnout resources,cancels the traditional route concept,divides the turnout into movable area and impact measuring area for control,and improves the turn back capacity by about 13 s compared with CBTC system.(3)Comprehensive turn back and main line tracking capability,under the same external conditions,the passing capacity of train control system based on train to train communication is increased by about 14.9% compared with the traditional CBTC system.Through the research,the quantitative index of train to train communication train control system improvement is obtained,which provides theoretical parameter support for the development of this technology into the mainstream direction of urban rail transit train control system in China.figures40,tables23,references32... |
