| With the rapid development of science and technology, as well as our strong infrastructure investment, the development pace of high speed train have been greatly accelerated. In particular, a large number of inputs for EMU production has brought great convenience for pepole's life. Whereas the automatic door control system is an important part of EMU, which directly relate to the safety of passengers. Accordingly, the control system not only must meet the functional requirements of the automatic door,but also have to adapt to the performance of high-speed, high vibration, strong electromagnetic interference of the complex operating environment.At present, the mainly used automatic door in our country is pneumatic automatic door. The electric automatic door are only used in the velocity level of 160 km / h or below, while the level of 200 km / h and above the electric automatic door are entirely on imports. And there are no reliable domestic products. Therefore, the technology of domestic automatic doors control system,particularly applied in EMU,is currently still at a relatively low level. However, with the development of rail transportation, electric automatic doors will be gradually applied in the high-speed passenger rail, especially in the EMU.In terms of practical application,the present article study the automatic doors,which have the digital control system technology of DC motor , the anti-interference technology and high-reliability technology of the internal protection mechanisms. Based on the above, an EMU automatic door control system, which conform to chinese road conditions has been designed.In this paper, first of all,the working principle of the systemand was comprehensive introduced according to the component. Besides, the method of controlling the PWM DC motor speed and achieving anti-extrusion automatic doors was theoretically declared. Futhermore, the strategy of the control system was stated, which prepared to overall design for the door control system. For hardware systems, a comprehensive exposition was carried out based on the power circuit, control circuit, and driving circuit concrete design. It consists of the structure and function of the circuit analysis, as well as the view of device selection and application. And the functions of the circuit and electromagnetic compatibility also have been fully taken into account in the design process. In the aspect of software design, based on the system functional requirements in the practical application,this paper demonstrated the process of door width parameter self-learning , the door machine control tasks and drive control procedures of motor in the idea of modular. What's more,the program flow chart was attached.Digital Signal Controller (DSC) dsPIC30F5015 processor of Microchip is employed as the core of Control system,which is embedded microprocessors dedicated to digital control of motors. The chip combines high-performance DSP core with plentiful peripheral functions and provides a high-performance embedded single-chip solution for the control system. As a result, the chip simplified the system design, shorten the development cycle and reduced the development costs. Meanwhile, the controller's real-time processing and timing performance was increased. In addition, the reliability and accuracy of the system was achieved.Because the operation of the automatic doors of EMU is performed through the drive of DC motor, virtually, the door operation is implemented by means of controlling DC motor. To motor of the EMU door, it demands that the driving motor should possess the characters such as high torque-weight ratio, wide speed range and high reliability. Currently, in various types of mechanical and electrical systems, the Permanent Magnet DC Motor is suitable for the EMU door control system because of the excellence including the high efficiency, the strong carrying capacity, the hard mechanical properties, the stable performance and the impact resistance, etc. Therefore, a permanent magnet DC motor GR63X55 of dunkermotoren was employed as a drives in the article.The system adopts the driving circuit of H-type full-bridge which built by the power switch to meet the output voltage and current. Furthermore, so as to satisfy the stationarity of the motor in the low-speed run-time, a bipolar method is performed by controlling the PWM speed of DC Motor.In order to avoid mecadopthanical shock on the door caused by the door frame, the velocity of the automatic door will be relatively low at the beginning and closing stage. Combined with the door wide parameters self-learning function,the system designs the speed curve which result in the buffer velocity at the start and the end stage of the running process.Anti-extrusion of the automatic door control system is a very important security protection mechanisms in the practical application. Due to the special structure of the EMU door, installing any type of sensors in the door are not feasible, Or they will undermine the overall structure of the door and can't guarantee a high degree of air tightness when the door closed. Accordingly, there are not any sensor used in the automatic doors of EMU but by means of sampling the motor armature current to carry out anti-extrusion. In this paper, the calculation method of anti-pinch force of electric automatic door was gave based on the motor current.The site running and debugging proved that the control system is reliable performance and compliance with the requirements of practical applications. The control system can not only be applied in EMU automatic control doors, but also be transplanted to apply in automatic control doors of the mass transit railway light rail, monorail and new transportation systems including rubber tires automatic train-oriented, linear motor trainsand magnetic levitation train. |
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