Simulation of proportional control of hydraulic actuator using digital hydraulic valves

14th International Conference on Science, Engineering and Technology

自然科学;工业技术

Raghuraman, D.R.S.^1 ; Kumar, S Senthil^1 ; Kalaiarasan, G.^1

School of Mechanical Engineering, VIT University, Vellore, Tamil Nadu

632 014, India^1

关键词: Digital hydraulics;    Fast switching;    Fluid power systems;    High frequency HF;    Precise control;    Proportional control;    Proportional valves;    Valve technology;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/263/6/062080/pdf
DOI  :  10.1088/1757-899X/263/6/062080

来源: IOP

【 摘 要 】

Fluid power systems using oil hydraulics in earth moving and construction equipment have been using proportional and servo control valves for a long time to achieve precise and accurate position control backed by system performance. Such valves are having feedback control in them and exhibit good response, sensitivity and fine control of the actuators. Servo valves and proportional valves are possessing less hysteresis when compared to on-off type valves, but when the servo valve spools get stuck in one position, a high frequency called as jitter is employed to bring the spool back, whereas in on-off type valves it requires lesser technology to retract the spool. Hence on-off type valves are used in a technology known as digital valve technology, which caters to precise control on slow moving loads with fast switching times and with good flow and pressure control mimicking the performance of an equivalent "proportional valve" or "servo valve".