| In order to obtain the dynamic characteristics of the throttling speed control system under different working conditions, the simulation model of the speed control valve outlet throttling speed control system is established in MATLAB/Simulink environment, and the simulation research is carried out. Through simulation, the effects of different opening areas and different external loads on the dynamic characteristics of system startup and speed switching are analyzed, and the following conclusions are drawn. Firstly, when starting under different opening areas and external load conditions, the hydraulic cylinders will have different speed overshoots, especially in low speed and light load conditions. Secondly, when the external load is constant, the hydraulic cylinder speed is proportional to the opening area of the speed control valve, which means that the smaller the opening area, the larger the overshoot when starting. Thirdly, in the case of the same speed control valve opening area and different external load, the steady state value of the system after starting is basically the same, which indicates that the oil return speed control system has good speed stiffness characteristics. Finally, external load mainly affects the transient response process of the system. Under the condition of small load, the time that the overshoot and speed of the system reach the stable value increases when the load is large. |