different TMS systems are used in metro vehicles, and the functions realized will be different. Based on the actual operation of Shenyang Metro Line 1 and Line 2, this paper briefly analyzes the differences of TMS systems between the two lines in terms of system function, structure and communication mode.
keywords TMS system; Shenyang metro vehicles; System function and structure; System difference
1 TMS system
TMS system is an advanced, mature and reliable train control and diagnosis system. The system integrates the monitoring information of the on-board equipment of the main train with the information terminal connected by serial port on each train, which is convenient for the maintenance personnel to maintain the equipment and the driver to operate. The working data of the main vehicle-mounted equipment are continuously collected and transmitted to the display of the driver's desk, so that the driver can easily understand the equipment status during operation. Monitor the main on-board equipment at any time, and notify the driver of any fault and record it. In this way, it is convenient to take quick and accurate actions and find the cause of the failure as early as possible.
TMS system can also record the running state and fault history of the train and download them to the ground maintenance support system, which can improve the performance of the train and strengthen the operation management.
Of course, different companies' TMS systems have different characteristics and functions. Based on the actual operation of Shenyang Metro, this paper analyzes the differences of TMS systems adopted by vehicles in Line 1 and Line 2.
2 Talking about the TMS system used in Line 1
The vehicles in Shenyang Metro Line 1 adopt the TMS system imported from Mitsubishi Corporation of Japan. The system consists of central unit, local unit, display controller, display unit, event recorder, card reader, train bus, vehicle bus and maintenance terminal. The communication between vehicles adopts trapezoidal train bus; The communication inside the vehicle adopts RS485 vehicle bus; Both the central unit and the local unit adopt the measures of double redundant backup.
the system adopts a highly reliable storage and transfer method. Only the correct data is transmitted, which can minimize the impact of the fault and easily indicate the location of the fault.
the system has been widely verified in the industrial field. The physical layer used in the train bus is ANSI/ATA 878.1 "ARCNET", which has been listed in the list of ANSI and has been widely verified in the industrial field.
its advantages: long life cycle and long-term supply of parts. Since 2111, trapezoidal train bus has been applied to EMUs of more than 2111 vehicles. Trapezoidal train bus is defined as the standard of Japanese railway industry.
During the operation of Shenyang Metro Line 1 for more than two years, the system is stable on the whole, but there are still some areas to be improved.
3 Brief introduction of TMS system selected for Line 2
The vehicles of Shenyang Metro Line 2 adopt the TMS system of China Zhuzhou Times Electric, which is a microcomputer network control system based on the DTECS network control platform independently developed by Zhuzhou. It is mainly used in the field of rail transportation, including trunk high-power internal combustion, electric locomotives, high-speed intercity EMUs, urban rail and subway vehicles.
the system reduces vehicle wiring. The architecture adopts three levels: train control level, vehicle control level and function control level. Train control level bus is MVB of EMD communication medium, vehicle control level bus is MVB of ESD communication medium, and function control level bus is RS485.
The biggest feature of this system is the adoption of distributed technology, that is, the mode of distributed acquisition and execution and centralized control and management. Each functional module is installed in the control cabinets of different models, and the modules are connected by train bus and vehicle bus. Different types of vehicles are distributed train electronic control system DTECS composed of different vehicle control modules VCM, event recording module ERM, RS485 communication module RCM, bus coupling module BCM, digital input and output module DXM, analog input and output module AXM and intelligent display device IDD.
Since the vehicles of Shenyang Metro Line 2 were loaded in 2111, it has stood the test of practice and become a mature brand independently.
4 Analysis of the differences between the TMS systems of Shenyang Metro Line 1 and Line 2
Shenyang Metro Line 1 and Line 2 have been fully opened for passenger transport. After time, we have gradually summarized some differences between the TMS systems of the two lines of vehicles.
4.1 In terms of system structure and operation mode
The TMS system of Line 1 adopts the same number of CPUs in each car as the central unit/local unit of the control unit, and each CPU serves as the main and auxiliary complementary node of each other. The failure of a single node or two nodes of different vehicles will not affect the function of the system. The main structural units are centrally installed in the box under the vehicle, so it is time-consuming and laborious to lower the pantograph to download relevant data under the vehicle during operation.
The TMS system of Line 2 adopts a distributed modular structure, and each functional module is installed in the control cabinets of different vehicles. Different types of vehicles have different types and quantities of modules. Using distributed modular structure technology, the technical leap from centralized control to distributed network control is realized. All modules are installed in the electric cabinet in the car, which simplifies the structure and reduces the counterweight. When downloading data, it can be completed directly in the car, and there is no need to drop the pantograph, saving time and effort.
On the whole, the system structure of Line 2 is simpler than that of Line 1, with convenient operation and much lighter counterweight.
4.2 Data transmission and information download mode
The TMS system of Line 1 consists of trapezoidal train bus communication, vehicle bus communication and RS485 bus communication. Any transmission node is redundant. The communication mode of store and forward is adopted, which makes the system have very high reliability; The real-time performance of system control command data is ensured by packet segmentation and priority control. The transmitted data mainly includes control instructions, status data and block data. Control instructions, status data and block data are processed by the application software of the central unit/local unit. All the data are downloaded from the CPU of the corresponding car, and three professional system software and equipment, VVVF, SIV and TMS, are needed to analyze the system failure. Some division of labor is too fine, and there are too many homework hours.
the train control level bus of TMS system of Line 2 is the MVB of EMD communication medium, the vehicle control level bus is the MVB of ESD communication medium, and the function control level bus is RS485. Train-level MVB is used to connect electronic components between vehicles, thus forming a train control communication network. The transmission speed, transmission capacity and real-time performance have been greatly improved, and the reliability of the system has been improved. Data transmission on the bus adopts the following two data types: process data and message data. Because the bus transmission is adopted, the relevant data can be downloaded by key modules, and the three professional system software, VVVF, SIV and TMS, are integrated into one platform, which is convenient for analyzing faults and saving operation time.
4.3 dealing with the environment
Shenyang Metro Line 1 is the first subway line in Northeast China, with cold winter and low temperature. Such changes in environment and temperature lead to some system virtual faults. For example, the valve failure of the brake system is falsely reported, and the door failure is not related. The stability and fault definition of the TMS system need to be adjusted according to the place.
The TMS system of Line 2 has strong adaptability to the environment. In a cold, humid environment, virtual faults rarely occur. This ensures the accuracy and timeliness of the real-time data of the equipment. Thereby improving the stability of subway vehicle operation.
5 Conclusion
According to the actual situation of Shenyang Metro, we can see that the TMS system used in Line 1 has both advantages and disadvantages, which is more stable and less adaptable. Relevant improvements need to be made according to local conditions, and the structure, counterweight and layout also need to be improved.
the TMS system selected for line 2 has adaptability and stability. But also simpler in structure and convenient for maintenance and repair. All modules are placed in the car, which is also convenient for downloading data, fault analysis and software upgrade at any time. At the same time, according to different models and modules, bus transmission is more concise and rapid.
At present, the module design of TMS system selected for Line 2 will be the development trend of network system. For example, Bombardier's TMS system adopts modular design. For this reason, we firmly believe that in the future subway vehicles, more will be the modular network system selected by Shenyang Metro Line 2.
reference
[1] Chloe Wang. Analysis and research of train network control system. Southwest Jiaotong University. 2118. TP273.5; U284.48
[2] Peng Daiwen, Li Honghui, Zhang Chun et al. Train communication network and its access control protocol and selection principle [J]. Railway Computer Application, 2116. 15(11): 47-49
[3] Rong Zeng, Yang Weifeng. Train distributed network communication and control system [J]. Wang Xue. High-speed train network and control technology [M]. Chengdu: Southwest Jiaotong University Press, 2118
About the author: < P > Zeng Fanhua, born on September 26th, 1985, male, Han nationality, graduated from Dalian Jiaotong University with a bachelor's degree, and is an assistant vehicle engineer in the engineering construction center of Shenyang Metro Group Co., Ltd..