- 學位論文
機車電子控制式無段變速器之創新設計
Creative Design on an Electronically-Controlled Continuously Variable Transmission
摘要
本研究主要目的是創新設計一組機車用電子控制式無段變速系統(ECVT)，以擺脫傳統無段變速器機構(CVT)之減速比曲線無法隨需求而改變的限制。 為了減少機車上有限電能之消耗，在設計上本文引用部份引擎動力驅動所設計之傳動系統，使傳動系統具有主動控制改變減速比之功能，並改良設計一組同步機構來作接合與分離動力源之功能，同步機構設計具有正逆轉之功能而切換動力源的傳遞與分離是利用步進馬達來作為作動器，再經由動力螺桿傳遞至驅動輪盤。可動螺桿的功能為將旋轉運動改變為直線運動，再推動滑動驅動輪盤以改變減速比。 本研究利用電腦軟體MATLAB/Simulink進行性能模擬與分析，根據所設計之電子控制式無段變速器進行追蹤CVT減速比曲線之模擬，再模擬分析作動器與整個傳動系統之時間常數(Time constant)與時間延遲(Time delay)以瞭解此系統是否可以完成改變減速比之功能，最後再探討引擎分配至可動螺桿之扭力造成的影響，並分析電子控制式無段變速器之加速性能。 實驗方面將以馬達為動力源實驗驗證引擎所分配至可動螺桿之扭力，並將模擬與實驗做比對以驗證扭力分配之正確性。
並列摘要
This research is mainly on the creative designing of electronically- controlled continuously variable transmission (ECVT) for motorcycles, and aim to get rid of the constant speed ratio curve restriction of the traditional CVT. Part of the engine power is transmitted to the transmission system for speed ratio change. A synchronous mechanism is use to reach the function of engage and disengage which is accomplished via a step motor. A power screw is used to actuate the movable sheave of the driving pulley to change the speed ratio. The computer software MATLAB/Simulink is used in this research for analyzing the performance of the electronically controlled continuously variable transmission system. Speed ratio change curve of the original CVT system is simulated by using the ECVT system. Simulation for Time Constant and Time Delay of the ECVT system is also made for better understand the ability of the ECVT system. Power consumption of the ECVT system is evaluated prior to calculate the vehicle acceleration in order to analyze the performance of the transmission system. Experiments using motor as power source which is split into power screw and transmission system are used to verify accuracy of the simulation.