Haluk Görgün

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This paper presents a scheme for estimating membrane water content in polymer electrolyte membrane (PEM) fuel cells from voltage, current, temperature, and several pressure measurements. The approach is to exploit the resistive voltage drop which is closely associated with membrane water content. To distinguish this resistive drop from other voltage losses(More)
This paper presents nonlinear observer designs for the Catalytic Partial Oxidation (CPO) and the Water Gas Shift (WGS) reactors in fuel cell power systems. The observers make use of available temperature and total pressure measurements and estimate the mole fractions of each species in the reactors. Estimation of H2 and CO fractions is particularly useful(More)
This paper presents a novel stabilization result for the Furuta pendulum for a large region of attraction including almost all of the upper half plane. The solution is obtained via constructing a Lyapunov function after set of coordinate changes. Then, a set of differential equations are solved to achieve asymptotic stability which is proved in accordance(More)
PID (Proportional - Integral - Derivative) controllers are the most widely used closed loop controllers due to their simplicity, robustness, effectiveness and applicability for much kind of systems. With the rapid development of technology, implementation of PID controller has gone several steps from using analog components in hardware to using some(More)
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