Abstract: The advantages of soft start and step-less speed regulation of the viscous speed control system make it widely used, but its inherent nonlinear characteristics such as dead zone and hysteresis increase the control difficulty. Aiming at the dead zone and hysteresis characteristics of the hydro viscous speed control clutch, an intelligent speed control method of the hydro viscous clutch based on the nonlinear inverse hysteresis model is studied. The hydro viscous speed regulating clutch is modeled by using the data of the main hysteresis loop, and the information of the secondary hysteresis loop is obtained through nonlinear mapping, the main hysteresis loop and the secondary hysteresis loop together form the inverse hysteresis model; With the inverse hysteresis model as the feedforward link and the active disturbance rejection controller as the feedback loop, a speed regulation scheme is designed to compensate the nonlinear system into a pseudo-linear system to reduce the lag and dead zone and improve the control accuracy. After bench test verification, the proposed control method can reduce the dead zone of the system and expand the effective control range; Reduce the nonlinear degree of the system from 40%-60% to less than 20%; Compensate the inherent hysteresis of the system, so that the hysteresis of the system is reduced from 40%-50% under open-loop control to 15% under reverse compensation closed-loop control; Turning point lag time less than 1s; Enhance the dynamic performance of the system. Suppress the influence of input speed fluctuation on the system.

Key words: viscous speed control system, nonlinear characteristic, hysteresis characteristics, inverse hysteresis model, active disturbance rejection control