Design and Prototyping of a Fuel Cell Controlling Equipment for Small Hybrid Driving Airship System

What is it about?

In the present study, an airship for the fixed point observation of nara withering in village forests was designed and trial manufactured. The airship consists of a helium gas filling envelope of 4.5m in total length, propeller-driven motors, a polymer electrolyte fuel cell (PEFC) in order to achieve longer flight, Ni-H batteries, a CCD camera observation system, and propeller control systems. Automatic charging device was designed to charge the Ni-H battery from the PEFC in the sky automatically. It controlls the power system by using a micro computer in a mannar where the electromagnetic valve supplying hydrogen is open to recover the output voltage of the PEFC when the voltage of Ni-H battery decreased to a certain level, resulting in energy charging to the Ni-H battery and keeping the rotation of the moter. The opened electromagnetic valve is closed when the Ni-H battery full charged. Furthermore, after a certain hours operation when the output voltahge of the PEFC drops due to accumulation of impurities in hydrogen gas, the outlet valve will be opened to exhaust hydrogen containing accumulated impurities. It has been verified that as soon as the Ni-H battery voltage doropped to less than 3.8 [, the hydrogen inlet valve opened then the output of the power source increased suddnly to around 7.

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