High-speed on/off solenoid valves (HSVs) are digital vales commonly used in hydraulic power systems. These valves are usually used in pressure and flow control which requires high dynamic and energy performance to improve the control accuracy. This paper aims to propose a new control method used to improve the dynamic and energy performance of HSVs. The proposed method is based on the pulse width modulation (PWM) technique implemented by LabVIEW software and NI myRIO. Based on that, NI myRIO has a real-time module; no feedback is needed. A mathematical model of the HSV is introduced, describing each subsystem of the vale and its interactions with each other. The proposed method is validated under different operating conditions. The results show that applying the proposed control method on the HSV will reduce the valve spool closing time by 72% and reduce energy consumption by 94% compared to the traditional on/off control method.
In this paper, a sensorless method of detecting the spool position of a high-speed on/off solenoid valve is presented. The method depends on analyzing the time-current curve of the solenoid coil passing current and measuring the maximum stroke of the valve spool, such that the dynamic behavior of the valve is estimated and the spool displacement curve is plotted. A mathematical model of the solenoid valve is developed and the effect of the hydraulic force on the valve spool is studied. Experimental results show that the proposed method error is less than 7% when compared to valve spool displacement measured by the commonly used linear variable displacement transducer.
Hydraulic motors have a high power capacity that makes them commonly used in different applications. These applications require precise control of hydraulic motors’ position, velocity, and force. Digital hydraulic valves are commonly used in hydraulic power systems. The high-speed on/off valves (HSVs) are digital valves usually used in flow or pressure control where high dynamic performance is required to improve the control accuracy. This paper aims to present an accurate method of controlling a hydraulic motor using HSV and PID control. A mathematical model of the whole system is presented. This model allows predicting the system response and refining the control gains to reach the desired response. The model parameters are obtained by experimental measurement, or typical values are used. The model is implemented using MATLAB and SIMULINK. Then it is validated experimentally using some tests. The designed control method is implemented on the motor using NI myRIO as a controller, which is coded by LabVIEW software
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