| Since the early 1990 s,the EMU(Electric Multiple Units)has achieved six major speed increases.By April 2021,the operating speed of domestic EMUs has reached350 km/h.With the huge increase in the speed of the EMU,the requirements for the stability and comfort of the EMU during the high-speed operation are getting higher and higher.As an important part of the EMU,the electric end door control system of the EMU is located at the junction between the cars and is an important passage for passengers.When the EMU is running at high speed,if the end door control system fails,it will cause great harm to the personal safety and interests of passengers.Therefore,to research on the technology to improve the stability of the electric end door control system of the EMU,it has important significance and application value.This article sorts out the overall architecture of the electric end door control system of the EMU and lists the important components of the control system.Design the hardware circuit of the end door control system according to the functions to be realized by the sliding door at the outer end of the standard EMU.Through the connection of brushless DC motor,pulleys,end door panels,mechanical frames and other equipment,an experimental platform was built.According to the operating environment of the end door control system,the relevant factors that affect its stability and safety in the long-term operation of the system are analyzed,and the influencing factors are reduced or eliminated through the designed optimization algorithm to increase the stability of the end door control system.In terms of the running stability of the electric end door system of the EMU,in view of the load disturbance factor,this paper proposes to adopt the fuzzy-PID control algorithm.For the common PID algorithm’s weak anti-load disturbance ability and poor adaptability to nonlinear control objects,the fuzzy control algorithm is used to adjust the proportional,integral,and differential coefficients in the PID algorithm online to strengthen the dynamic adjustment ability of the common PID algorithm.The two algorithms are compared through simulation experiments and actual tests.According to the experimental results,the fuzzy-PID control algorithm enables the system to have a faster response speed,and effectively suppresses phenomena such as overshoot and oscillation,so that the different movement stages of the end door can be stabilized;Aiming at the problem of voltage disturbance in the process of train traveling,a fuzzy control algorithm is proposed.According to the deviation between the actual voltage and the rated voltage,a fuzzy control table for correcting the duty cycle is established.By adjusting the duty cycle to reduce the impact of voltage fluctuations.According to the experimental results,the fuzzy control algorithm can effectively suppress the voltage fluctuation and further strengthen the stability of the control system.For the factors that affect the safety of the system,the existing anti-extrusion,self-locking and other functions have been optimized from the perspective of ensuring passenger safety.For the anti-extrusion function,this article proposes to set the speed threshold and current threshold to double judge whether the extrusion phenomenon occurs,which improves the detection accuracy;For the self-locking function,this article uses the reduction of the accumulated value of the Hall count as the judgment basis,and discards the traditional limit switch device.This method not only saves costs,but also improves sensitivity.Through the optimization of the above-mentioned safety functions,the safety of the control system is further improved.After optimizing the above-mentioned control algorithm,the operation stability and safety of the electric end door control system of the EMU have been improved,which meets the requirements of practical applications. |
