Abstract: As traditional hydraulic valves have limited functions and flexibility in applications, a new intelligent reversing valve is designed and tested to expand the functions of hydraulic valves and simplify hydraulic system circuits. First, the theoretical basis and architecture of the intelligent valve with a high-speed on-off valve as the pilot valve is proposed. Then, a mathematical model is established for the intelligent directional valve, and a physical model of the valve is constructed using AMESim to simulate and study the dynamic and static characteristics of the pilot valve as well as the main valve. The results show that the response delay time of the pilot valve is approximately 5 ms, which is primarily affected by the driving voltage of the coil and the elastic coefficient of the spring. Finally, a PWM duty cycle displacement control method is proposed, and the feasibility of controlling the displacement of the main valve spool by controlling the duty cycle of the pilot valve's PWM signal is verified by simulation. The results show that when the PWM signal frequency is 50~100 Hz, the main valve has good linear control characteristics in the range of 0.2~0.8 duty cycle.

Key words: intelligenthydraulicvalve, high-speedon-offvalve, PWMsignal, simulationanalysis