Abstract:In order to solve the problem of slow response speed of the hydraulic system of the electric forklift during starting and position adjustment, a solution using the combined speed regulation of the pump and valve is proposed. Aiming at the working characteristics of electric forklift, the control method of combined pump and valve speed regulation was proposed. In the pump control section, the fuzzy control was introduced as the operator function to adjust the Proportion Integration Differential (PID) parameters in real time, thus improving the self-adaptive ability of the motor under different working conditions. In the valve control link, PID control was used to ensure the stability of the output flow. The simulation results of Simulink and AMESim show that the vector control with fuzzy control can greatly improve the adaptability of different working conditions, and the valve control can effectively improve the system response speed. The combined pump and valve speed regulation not only overcomes the shortcomings of response delay of simple frequency conversion speed regulation, but also has good adaptability to complex working conditions.