| Electric Multiple Units (EMUs) as an efficient means of transport is a great convenience for people's life. In China, as development of high-speed railway and improvement of the speed of EMUs, both the reliability and the security of EMUs can not be ignored. Automatic door control system is an important part of EMUs, which relates to the safety of passengers and directly impacts on the performance of EMUs. Therefore, automatic door control system in EMUs needs the capability of working stably in high vibration, noise and strong interference environment. Nowadays, automatic door control system in EMUs, mainly rely on foreign technology and import of foreign equipment. There are no mature products in China. In order to meet the rapid development of domestic high-speed rail, moving from the domestic door control system's dependence on foreign technology, and improve our rail passenger capacity and technical level, this paper has been in-depth analysis, focusing on the stationarity and security of the optimal control method.First of all, this paper introduces the hardware and the control principle of automatic door control system for practical application. The hardware of automatic door control system is the operating system software platform and the basis and prerequisite of analyzing motor operation and optimizing the control algorithm. The hardware architecture of automatic door control system is divided into four parts, such as the power section, the input-output interface, the motor drive circuit and the feedback section. The core devices are DC-DC converters the power section, which achieve DC24V regulator and DC5V conversion with isolated power supply module. The Digital Signal Controller named dsPIC30f5015 in the automatic door control system is analyzing the current state of automatic door operation and the implementation of control algorithms to complete the control of motor rotation functions, by detecting the core power voltage signals, current protection signals, limit switch signal and motor speed feedback signals. Automatic door control system theory have three aspects: the control theory of the motor running, the PWM control theory and the PID control theory. The control theory of the motor running and the PWM control theory are used to analyze the theoretical basis for motor running, in order to achieve stable operation of the motor.Dc motor optimal control is the key content of automatic system optimization control, focus on the need for automatic door EMUs concrete analysis of the characteristics, in order to optimize the content of the line of performance index. The opening and closing process is divided into four stages: startup, high speed, deceleration and low speed. It is required smooth and small overshoot in the start-up stage. In the high speed stage, the speed remains constant. It is fast response and small overshoot in the deceleration stage. In the low speed stage, the speed remained constant, in order to quickly brake. This paper accesses to the control signal and the output of the function of motor speed, analyzing the characteristics of DC motor control system for automatic door. This paper analysis the relationship of the motor speed, power supply voltage and the weight of automatic doors, using the specific parameters of EMUs automatic door control system and using digital PID algorithm to improve the motor running stability. The optimal control of DC motor in EMUs automatic door control system mainly combines of three kinds of control theory to solve practical problems in three areas: using the improved PID control method solve the problem of the motor smooth functioning in different load conditions, using fuzzy control method solve problems of operating motor stably in different voltage, using the adaptive algorithm solve the error problem that the mechanical structure of the internal and external doors generated in the process. Ultimately based on these three kinds of control theory, it is obtained a control algorithm, which named fuzzy self-adaptive PID algorithm, to achieve optimal control of DC motor and to improve the smooth running of automatic doors.The focus of security optimization control in automatic control system is to improve and to upgrade the automatic door control system overall performance, analyzing the existing control methods of the safety performance. This paper mainly optimizes the design of control algorithms of Extrusion prevention function and self-locking function, focused on analysis of the size of the automatic door extrusion pressure. As well as, this paper analyzes affection of the factors of automatic door control system in different EMU environment characteristics. Analyzing disorder of mechanical structure movement and changes of control current to improve the sensitivity of anti-extrusion capabilities and strictly control the scope of extrusion pressure, it prevents excessive pressure which causes injuries and equipment damage. Analyzing the sliding displacement of automatic door to improve self-locking function, it makes sure that the doors remain closed state, in order to protect the train's air tightness and improve the overall safety performance of EMUs automatic door control system.The control parameters of fuzzy self-adaptive PID algorithm need to be fixed through experiments. Using MATLAB software to check the control system transfer function, it simulates the experiments of motor running, in order to provide the basis parameters of PID control algorithm. It tests and amends the control parameters of optimal control algorithm, so that the operation of automatic door achieves the desired control objectives, using experimental verification of the EMUs inside and outside the side doors. And through on-line monitoring of the way to obtain automatic door operation process of instantaneous speed data, the use of trace-point method curves the operation of automatic doors. It is whether achieved the automatic door control system of the prospective control requirements, by comparing the running curves to the demand curves. Test the stability and the safety of the automatic doors in the EMUs, through the experiments. Tested the optimal control algorithm of EMUs automatic door control system, the stability and the safety of the automatic doors have been enhanced, so that the system mainly meets the practical applications. |
PDF Full Text Request