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An algorithm for sensor-less fuel control of direct methanol fuel cells |
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| Authors: | Kun-Sheng Shen Yung-Yun Wang Yu-Jen Chiu |
| Affiliation: | a Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30034, Taiwan b Department of Chemical Engineering & Materials Science, Yuan Ze University, Chung-Li, Taoyuan 32003, Taiwan c Fuel Cells Center, Yuan Ze University, Chung-Li, Taoyuan 32003, Taiwan d Department of Mechanical Engineering, Technology and Science Institute of Northern Taiwan, Taipei 11202, Taiwan |
| Abstract: | We report an algorithm for real-time control of the fuel of a DMFC. The MEA voltage decay coefficients [e1, e2], and I-V-T, M′-I-T, and W′-I-T curves (where I is the current, V the voltage, T the temperature, and M′ and W′ the methanol and water consumption rates, respectively) of n fuels with specified methanol concentrations CM,k (k = 1, 2,…, n) are pre-established and form (I,V,T), (M′,I,T), and (W′,I,T) surfaces for each CM,k. The in situ measured (I,V,T)u after voltage decay correction is applied to the n preset (I,V,T) surfaces to estimate CM,u (the CM corresponding to (I,V,T)u) using an interpolation procedure. The CM,u is then applied to the n preset (M′,I,T) and (W′,I,T) surfaces to estimate cumulated “methanol” and “water” consumed quantities . Thus in a real-time system, the CM and total quantity of fuel can be controlled using the estimated CM,u and cumulated “methanol” and “water” consumed quantities. |
| Keywords: | Fuel control Sensor-less algorithm Direct methanol fuel cell |
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