Abstract
The presented work was directed to develop the dynamic performance of an electro-hydraulic proportional system (EHPS). A mathematical model of the EHPS is presented using electro- hydraulic proportional valve (EHPV) by Matlab-Simulink, which facilitates the simulation of the hydraulic behavior inside the main control unit. Experimental work is done and the closed loop system is designed using the linear variable displacement transducer sensor (LVDT). The controller of the system is an Arduino uno, which is considered as a processor of the system. The model is validated by the experimental system. The study also presents a real time tracking control method, based on pulse width modulation, by controlling the speed of the actuator to achieve the position tracking with minimum error and low transient time, by applying the constant input signal 50mm the transient time was 0.9 seconds and the error 1.8%.
Highlights
The proportional valve is a valve, which produces a proportional output to an electronic control input, or a valve that operates by proportional solenoids instead of on-off solenoids.It can be classified to three types; pressure control valves, flow control valves and directional control valves.The pressure control valves are designed mainly to control the pressure while the proportional flow control valves are designed mainly to control the flow rate and the proportional directional valve is used to control both the flow direction and the flow rate.Many studies have dealt with the proportional valve investigations
Chen et al [7] studied the nonlinear model of a variable displacement axial piston pump (VDAPP) with a three-way electro-hydraulic proportional valve (EHPV), which controlled the swash plate actuators
This delay is due to the controller, which reduces the actuator speed to avoid the actuator inertia that led to high overshooting; the mathematical model result is still in a good agreement with the experimental result
Summary
The proportional valve is a valve, which produces a proportional output to an electronic control input, or a valve that operates by proportional solenoids instead of on-off solenoids. Vaughan and Gamble [1] presented a nonlinear dynamic model of a high-speed direct acting solenoid valve, the model accurately predicted both the dynamic and steady state response of the valve to voltage inputs. Elmer and Gamble [5] presented a generic nonlinear dynamic model of a direct-acting electro-hydraulic proportional solenoid valve. Chen et al [7] studied the nonlinear model of a variable displacement axial piston pump (VDAPP) with a three-way electro-hydraulic proportional valve (EHPV), which controlled the swash plate actuators. Amirante et al [9] designed a new methodology of spool surfaces of 4/3 proportional directional valve It was based on redesign of both the compensation profile and spool lateral surfaces to reduce the flow forces acting on it.
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