具有無段變速器的複合動力系統之設計

複合動力系統一般具有多個驅動模式，而無段變速裝置(Continuously variable unit, CVU)可提供平順的速比變化。若能將兩者結合，便可利用驅動模式的切換，提升無段變速裝置的速比變化範圍與扭力傳輸容量，同時有利於動力源維持在高效率的工作區間。為了能夠方便的分析與合成此種系統，本研究提出基本路徑圖(Basic path graph, BPG)做為其拓樸構造的表示方式。此圖形係根據功能動力圖(Function power graph, FPG)的架構進行整理與簡化，使圖形中僅保留關鍵的構造。首先介紹其構成元件與連接規則，以及各種拓樸構造的簡化規則，包含多自由度元件、傳動路徑、以及耦合點的簡化方式。接著利用系統的特徵為其進行分類，以便合成出創新的系統。本研究提出CVU操作方向、動力耦合方式、與並聯於CVU的傳動路徑數量三種特徵，以及其在基本路徑圖中所需的必要構造。運用此三種特徵可產生12種不同的系統類型，並對參考文獻中的28個複合動力系統進行分類後，得到前述的12種系統類型中有5種尚為空集合。應用基本路徑圖，可合成出該5種尚無既有系統採取的架構。其後採用其中一種架構做為設計範例，將其發展為完整的複合動力系統，並以MATLAB分析其在兩種驅動模式下的內部動力流與速比變化。結果顯示此新系統可擴大CVU的速比變化範圍、並提高系統的扭力傳輸容量。

關鍵字

無段變速；複合動力；拓樸分析

並列摘要

Hybrid systems have multiple operation modes, and continuously variable units (CVUs) can offer stepless ratio variation. If the the two can be combined together, it is possible to increase the ratio coveage and enhance the torque capacity of the system. Also, the power sources will be more capable to work in their high-efficiency regions. In this research, a graphical method called as basic path graph (BPG) is proposed to analyze and to synthesis the topological structure of the system. It is simplified from function power graph (FPG), and presents only the key elements and transmission paths. In the beginning, the basic elements and the connection rules are introduced, including the procedures for simplifying multi degree-of-freedom elements, transmission paths, and coupling points. The systems can be classified into 12 different types by the following three characteristics: direction of power flows through the CVU, coupling pattern of the power inputs, and number of transmission paths parallel to the CVU. The required structures of the system according to its characteristics are also specified. After the 28 hybrid systems in the references are classified, 5 among the 12 types are still null sets. With the specified required structures, the 5 types of systems can be synthesized. And one of them is chosen to be developed as a complete system. In the result of the analysis with MATLAB, the novel system can increase the ratio coverage of the CVU, and can enhance the torque capacity of the system.