| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 101 === The purpose of this study is to analyze and to develop a new complex zero emission electric bus system. Based on the electric vichle which uses only batteries as its energy storage system, this study adds a variable inertia flywheel and a ultracapacitor into it. By the property of hight power density, variable inertia flywheel and ultracapacitor can recover the defect of battery - low power density. And ultracapacitor can be charged and discharged by high current without losing its life cycle. Not as ultracapacitor, the life cycle will be knocked down when using high current to charge or discharge batteries. So when the bus needs high power to acceleration, the ultracapacitor in the new system of this study can protect the battery from high current discharge and improve the life cycle of the batteries. This study starts from synthesizing the new system by using graph theory. And establishes the standard to choose the best system. Then devises the control strategy and writes a MATLAB program to simulate the new system using ECE (Economic Commission of Europe Urban Driving Cycle) and New York Bus driving cycle. At last, estimates the life cycle of the new system that with a variable inertia flywheel and a ultracapacitor by the numerical Battery Life Cycle Estimate Method developed in this study. The result shows the benefit to extend life cycle of the batteries in the new systems that add different amount of ultracapacitors
and change the mass of variable inertia flywheel.
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