汽車是人類最重要的交通工具之一，基於目前的電池發展水準，大力發展混合動力汽車是改善汽車油耗和排放問題的最優方式。
本研究基於創意性機構設計方法，針對並聯式行星齒輪混合動力傳動系統提出一套設計流程，系統化地進行行星齒輪傳動機構的設計，並進一步配置動力和離合器與制動器，合成出具離合器與制動器的並聯式混合動力傳動系統。
應用本研究提出的設計流程，以Tsai等人所設計的一款具七桿十接頭的並聯式行星齒輪混合動力系統機構為現有設計，計合成出14種可行的無配置離合器與制動器的行星齒輪系圖譜，以及四類共58種可行的配置離合器與制動器的的傳動系統圖譜。在四類傳動系統中各擇一例分析其所能實現的運動模式，並計算速度與扭矩。此外，應用田口式設計方法進行齒數設計，此四種新設計在馬達驅動模式下的轉速比均有顯著提高。

Vehicle is one of the most popular transportation in our daily life. It is the best choice to develop hybrid electric vehicles to reduce fuel consumption and cut down emissions according to the state-of-art research of battery.
The work, based on Yan’s creative mechanism design methodology, takes the planetary gear trains (PGTs) of parallel hybrid electric vehicles as the research object to systematically synthesize all feasible PGT designs. Then, by adding power arrangement and clutch and break arrangement, feasible clutched PGT parallel hybrid transmission systems are further synthesized.
The work, based on a 7-link and 10-joint parallel hybrid transmission proposed by Tsai et al. as the existing design, synthesizes 14 clutchless parallel hybrid transmissions and 58 clutched parallel hybrid transmissions in the four groups by applying the proposed methodology. One design is chosen from each group to analyze its operating modes by controlling the clutches and breaks, and for kinematic and power flow analyses. Finally, using Taguchi experimental design approach, the output speed ratio of electric motor mode of all proposed four designs enhance a lot as comparing with the existing design.

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