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| Energy management strategy for fuel cell hybrid electric vehicle |
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Generally, fuel cell-powered vehicles are equipped with an energy storage system and are often called fuel cell hybrid electric vehicle (FCHEV) because the addition of an energy storage system creates an additional degree of freedom in power flow. This allows the fuel cell system to operate more reliably and efficiently. For harnessing the full potential of FCHEVs, power coordination between the two energy sources, known as energy management strategy (EMS), is very important.
Recently, advanced technology in geographic information systems (GIS), global positioning systems (GPS), and intelligent transportation systems (ITS) has created opportunities to utilize future driving information, which consists of altitude profile, average velocity for each section, and etc. Under hilly road conditions, control performance of EMS depends on availability of the future driving information because the future driving information enables the controller to utilize upcoming potential energy optimally. For example, when approaching downhill section, EMS promotes battery system discharging before said section arrives for improving fuel economy as well as the battery charge sustenance.
We are studying horizon-optimization approach such as dynamic programming, pontryaginĄ¯s minimum principle and instantaneous optimization approach such as equivalent consumption minimization strategy for FCHEV. Especially, we focus on development of position-based EMS based on hilly road information.
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