NDLI: On/Off Valve Based Position Control of a Hydraulic Cylinder

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Michael, B. Rannow Perry, Y. Li
Copyright Year	2007
Abstract	A method of precisely controlling the position of a hydraulic actuator using an on/off valve is developed. Since valves exhibit little power loss when they are fully open or fully closed, the proposed system is more efficient than throttling valve control and can achieve flow variation without the expense or bulk of a variable displacement pump. Mating a pulse-width-modulated (PWMed) on/off valve with a fixed displacement pump and a smoothing accumulator creates a software enabled variable displacement pump. A drawback of using digital valve control for hydraulic systems is that the relatively low speed of the currently available switching valves results in a significant ripple in the pressure and flow rate. We propose a solution to this problem by using a throttling valve to shield the actuator from the ripple in the output. This creates an effective load sensing system with the throttling valve used only to provide a small known pressure drop between the supply and the load. This approach is significantly more efficient than the conventional technique of using throttling to vary the full flow. This paper presents an averaged model of the system, a nonlinear controller to achieve position control of an actuator and a simulation based study of the effectiveness of the controller.
Starting Page	141
Ending Page	149
Page Count	9
File Format	PDF
ISBN	0791842983
DOI	10.1115/IMECE2007-42590
e-ISBN	0791838129
Volume Number	Volume 4: Design, Analysis, Control and Diagnosis of Fluid Power Systems
Conference Proceedings	ASME 2007 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2007-11-11
Publisher Place	Seattle, Washington, USA
Access Restriction	Subscribed
Subject Keyword	Actuators Computer software Position control Control equipment Valves Secondary cells Flow (dynamics) Pressure Displacement Stress Hydraulic drive systems Hydraulic cylinders Simulation Pumps Pressure drop
Content Type	Text
Resource Type	Article

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