关键词: 负载敏感多路阀, 压差补偿, 流量调控, 自抗扰控制（ADRC）算法

Abstract:  Load-sensitive multi-way valve was the core component for the hydraulic system of construction machinery， the pressure compensator was used to keep the differential pressure of the valve ports constant， but the differential pressure was susceptible to the spool opening and load changes， resulting in low accuracy of the main valve flow rate control.Therefore， a new type of load-sensitive multi-way valve differential pressure continuous control method was proposed， a proportional solenoid was used to push the spools of the compensator valves， and ADRC algorithm was used to control the proportional solenoid thrusts and realize the closed-loop control of differential pressures of the main valves， so as to accurately control the flow rate.Firstly， the working principle of the system was introduced and a mathematical model was established， then a simulation model was established based on AMESim-MATLAB joint simulation platform， and a test bench was built for experimental validation， the characteristics of the valve differential pressure maintenance and the main valve flow rate regulation were analyzed under the conditions of load changes and main valve opening degree changes. The results show that compared with the load changes， the changes of the main valve opening degree have a greater impact on the  differential pressures. A new type of valve port differential pressure control structure and method may accurately control the load-sensitive multi-way valve differential pressures， so as to achieve the effectiveness of precise control of the flow rate， and may actively regulate the differential pressures without changing the main valve opening degree， so as to achieve the flow rate for the further regulation.

Key words:  , load-sensitive multi-way valve, differential pressure compensation, flow rate regulation, active disturbance rejection control（ADRC） algorithm