- 學位論文
多功能自行車驅動系統之研製
The Implementation of Multi-function Bike Driver System
摘要
本文主要以一般腳踏車、健身發電腳踏車與電動自行車之功能為系統核心，建構出多功能自行車驅動系統之架構，並利用輪轂式無刷直流馬達完成電動與發電兩大主要功能之設計。而系統可選擇功能模式切換，電動模式經由無刷直流馬達控制IC對其驅動，達到驅動自行車前進之目的；而健身發電模式則是利用無刷直流馬達逆向操作，使其產生電能，再藉由SEPIC轉換器作混合定電流定電壓充電控制，對鋰鐵電池進行儲能，同時兼具健身阻力之功能，並可由控制面板調整阻尼級數，達到健身阻力增減的目的；而系統為了保護電池壽命，配合制動電路設計出模糊輔助制動控制，使電池趨近充飽時，能確實將多餘之能量消耗掉。並且為符合多功能自行車之需求，設計一套適用於鋰鐵電池的整合型安培小時估測法，使系統得以判斷充、放電期間電池之容量；並利用三軸加速度感測器配合最大功率追蹤控制，製作出自動感測下坡防煞控制，使其於下坡時，將煞車能量有效回充至鋰鐵電池當中，達到下坡煞車最佳化控制，使系統可於各模式下，具備完整且多功能化之功效，提升使用者之便利性。
並列摘要
This paper aims at the construction of multi-functional bike driving system, which derives from combination ideas of bike, electricity-generator type and electric bike. By using wheel BLDC motor, it serves the purposes of driving and generating electricity. The user can switches models from “electric driven” to “electricity generation” freely. In “electric driven” mode the bike uses wheel BLDC motor and control IC to move and in “electricity-generation” mode, the bike works quite the reverse way--- electric energy is generated and stored in lithium-iron battery during exercising. By using SEPIC convertor, the charging process is controlled in current level and constant voltage. Meanwhile, the user can also adjust the resistance of bike from its control panel to serve the purpose of exercising. As for battery life protection, a fuzzy auxiliary brake control is designed to prevent over charging and it consumes extra energy when charging process is completed. To fulfill its multiple functions, the design features in lithium-iron ampere-hour estimation system to judge the residual capacity during charging and discharging. By using three-axes G sensors and maximum power point tracking control, we develop “automatic anti-break-lock control” for downhill movement. When going downhill, the energy generated by breaking can be efficiently charged back in lithium-iron battery to optimize energy-generating function. With these various functions, we enhance the convenience of bike by our multi-functional system.