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by Patrick Opdenbosch

EHPV™ Technology. Advanced Control Techniques for Bi-directional Proportional Flow Control Valve. by Patrick Opdenbosch. Project Goals Develop advanced and robust techniques for flow control of EHPV™. Experiment with highly non-linear systems. MS/Ph.D. degrees. Research Guideline:

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by Patrick Opdenbosch

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  1. EHPV™ Technology Advanced Control Techniques for Bi-directional Proportional Flow Control Valve by Patrick Opdenbosch • Project Goals • Develop advanced and robust techniques for flow control of EHPV™. • Experiment with highly non-linear systems. • MS/Ph.D. degrees • Research Guideline: • Examination of related works. • Development of EHPV™ mathematical model. • Identification of EHPV™ parameters. • Validation of mathematical model. • Development of control techniques: • Jacobian linearization. • Input-output linearization. • Optimal control. • Other more advanced techniques. • Run simulation on Hardware-in-the-loop. • Valve Features: • Zero leak • Precise metering control • Variable electronic control Solenoid Abstract The current trend in construction machinery is to use electrically controlled valves (solenoid valves) instead of manually operated hydraulic valves. One of the benefits is that these solenoid valves need not be located in the operator cab. In addition, the employment of these electrically driven valves facilitates computerized control of various machine functions. The Electro-Hydraulic Poppet Valves (EHPV™), a kind of solenoid valves, are used herein for flow control in hydraulic machinery. The flow control through the valve is achieved by changing the valve restriction coefficient via a poppet type orifice with pressure compensation. The integrated electronics makes practical advanced control algorithms to further extend the valve capabilities in new ways and its application. This project will explore new algorithms and applications via theory, simulation and operation of the valve in Hardware In the Loop (HIL) simulation facility currently under construction Input current Pilot poppet [3] [4] [6c] [1] Reservoir Tank [2] Pump [3] EHPV™ supply [4] Check valve [5] EHPV™ return [6] Actuator [6a] Lower cavity [6b] Upper cavity [6c] Piston Supply Return [6b] Control pressure [5] [6a] Patented pressure compensation method [6] [4] [2] [3] [5] [1] [1] INLET FLOW Wheatstone Arrangement to Control Actuator Displacement Main poppet OUTLET FLOW duv dxp dPp dxm Mathematical Model for a Single EHPV™ from Equilibrium State dQa Simulation of Valve Response About Equilibrium Flow for a PWM Input Current dQb Sponsors: HUSCO International and FPMC Center EHPV™ States, Flows, and Input from Equilibrium • Advisors: • Dr. Nader Sadegh, Dr. Wayne Book website: http://www.imdl.gatech.edu/opdenbosch Spring 2003 Email: gte608g@prism.gatech.edu

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