Abstract:  Aiming at the problems of large speed change rate, long buffer time and unstable movement of the working platform of scissor lifting platform, the speed control system of the working platform was investigated. Firstly, the lifting speed function of the working platform was established by the method of instantaneous center of speed, and the reason of unstable movement of the working platform was obtained through analysis. Then, according to the working principle of scissor lifting platform, a hydraulic control system was designed and the corresponding mathematical model of speed control system was established. Finally, the simulation experiment of the speed control model of the working platform was carried out by using Simulink, and the system performance under traditional PID control and fuzzy PID control were analyzed and compared. The results indicate that comparing with the traditional PID control, the adjusting time of fuzzy PID control to step signal is significantly shortened, the speed of the working platform is stabilized at 0.5 seconds without overshoot phenomenon, and the vibration of the system in the lifting stage is eliminated, which can quickly stabilize the speed of the working platform at a desired speed, and has better control performance and motion stability than traditional PID control.

Key words:  scissor lifting platform;speed control system;fuzzy PID;motion stability

ZHAO Xin, JI Ai-min, DENG Ming, et al. Design and simulation analysis of hydraulic control system for lifting speed of scissor lifting platform［J］.Journal of Mechanical & Electrical Engineering, 2021,38(9):1174-1179.