Senseless Transformation Project of Beijing Subway Line 5

The average daily passenger flow of Beijing Subway Line 5 has been up to 1,100,000 persons.However, faults often occur due to the aging signal equipment, poor anti-interference, low system computing ability and running-out of spare parts. Since the application of “non-inductive transformation” technology, the accumulated operation mileage has exceeded 4,500,000km and no safety accident occurs.     

To meet the transformation requirement for “urgency”, “complexity” and “high standard” of large passenger flow line in China, “non-inductive transformation” shall have phased, uninterrupted and meticulous operation characteristics and prevent risks during transformation while improving the efficiency. When formulating the operation specification and standard, TCT identifies the hazard source and controls the collaborative security for new and old operation scenarios through risk evaluation matrix, so as to provide an RAMS guarantee for compatible transformation.    

TCT solves the problems of existing system like different vehicle interfaces and vehicle-ground interfaces. Adopting selft-adaptive switching technology, one set of on-board core equipment can be compatible with CBTC and quasi-moving block.    

To solve the problems such as dispersed and unclear parameters and no ATO function of vehicles purchased in different batches, TCT realizes intergenerational vehicle ATO control through moving-window iterative model self-learning technology, Kalman filtering predictive control technology and feedforward control.    

For the actual operation scenarios of large passenger flow lines, TCT designs a phased and uninterrupted compatible transformation system to realize mixed operation management ——two systems and three driving modes for one line. During transformation, TCT follows the principle of partial transformation rather than overall transformation, which optimizes the investment structure.