Transactions of Materials and Heat Treatment

Title：Flow feedforward PID control and pressure drop simulation analysis of valve-controlled load sensing system

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ClassificationCode：TH137

year,vol(issue):pagenumber：2022,47(4):195-199

Abstract：

In order to improve the control accuracy of valve-controlled load sensitive system, the servo motor and variable pump were used to build the pump source to realize the synchronous adjustment of rotating speed and flow of hydraulic pump, and the stability of system was improved, and based on the mathematical model of load sensitive system and the control method of position loop, the characteristics of load sensitive system were analyzed. Then, by adjusting rotating speed method, the simulation model of load sensitive system was established by AMESim, and the accuracy of the control method was verified. The results show that the pressure drop fluctuation can be reduced effectively by setting the flow feedforward in the pump control subsystem. Under the condition of flow feedforward, the tracking error of the system is reduced. It can be seen that the setting of flow feedforward can reduce the pressure difference fluctuation at the throttle orifice and make the system achieve higher position tracking accuracy. The pressure drop at the throttle orifice of the system reaches a state close to the pressure instruction. As a whole, the position error decreases with the increasing of pressure drop at the throttle orifice. Thus, as the pressure difference instruction decreases, the system gains higher energy efficiency.

Funds：

河南省重点研发与推广科技攻关项目（192102210224）

作者简介：牛瑞利（1981-），女，硕士，副教授 E-mail：csllong@163.com

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