隨著全球環保意識抬頭以及國際法規對於傳統引擎車的限制，汽車產業致力於發展綠能車輛，然而現有純電動車存在許多電池技術及便利性問題，使得普遍消費者較無法接受。近年來，混合動力車迅速的發展，繼承了引擎車及電動車的優點，不但行駛時有平穩的動力和良好的加速性能，而且有效地降低油耗及空氣污染。
混合傳動系統為耦合動力不可或缺的一環，本研究旨在發展一套系統化的設計流程，基於創意性機構設計方法之擴展，系統化地整合出所有可行的並聯式傳動系統，並透過分析及模擬驗證新型設計之可行性。首先，建立車輛及電池之模型，根據性能需求選擇適當的動力源。接著採用本研究所提出之設計方法，依據設計需求與限制，並以現有Punch VT2為基礎，合成出所有可行混合動力無段變速系統之新型構想，計21個；其中，13個應用行星齒輪機構，8個應用鏈輪及齒輪的組合以達成引擎倒檔的特殊需求。經由概念評估，其中一個新構想被選出來進行細部設計及分析，並將此傳動系統安裝在一台已知規格之車輛中，車輛性能為：最大車速226 km/h、從0至100 km/h之加速時間7.1439秒、最大爬坡度51.16 %。最後，本研究設計出一套針對此新型混合動力車的模擬器進行模擬油耗的分析，亦建立一套控制邏輯，使車輛在行駛中自動換檔，在不同路況下選擇最適當的檔位。為減少油耗，本研究考量動力源特性、無段變速之減速比與連續性、檔位切換的順暢性、電池電量等各種限制下，針對充電效率及各操作模式的油耗進行最佳化。在EPA標準之測試規格下，此新型混合動力車在市區及高速公路的油耗分別為45和36 mpg，與其他現有混合動力車相比，具有相當大的競爭力。

In response to growing global environmental awareness and stringent international laws and regulations on vehicle emissions, the automotive industry is devoted to developing green vehicles. Since modern electric vehicles exist lots of restrictions on battery technology and convenience that general consumers do not accept, hybrid electric vehicles (HEVs) have been developed rapidly because it inherits the advantages from both conventional and electric vehicles. HEVs can provide stable power and has well acceleration performance, and even reduces fuel consumption and air pollution effectively.
Hybrid transmission plays an important role in coupling the power. This research focuses on developing a systematic design procedure based on an extension of the Creative Mechanism Design Methodology to synthesize all feasible hybrid transmissions, mainly on series-parallel systems with a mechanical reverse driving mode. Analyses and computer simulation are also carried out to verify its feasibility. Firstly, vehicle and battery models are established, and power sources are selected based on the performance requirements. Then, following the proposed design procedure and subject to the design constraints, 21 novel hybrid CVTs are synthesized. Among them, 13 designs apply planetary gear trains (PGTs) and 8 designs use a chain drive to reach mechanical reverse driving mode. Through a thorough evaluation, one of them is selected for further design and analyses. Stalling this system in a vehicle with known specifications, it has the maximum vehicle speed of 226 km/h, a 0 ~100 km/h acceleration time of 7.1439 seconds, and gradeability of 51.16 %. Finally, a program is developed for computer simulation to analyze novel design’s fuel economy. In addition, a control strategy is built to shift to the suitable operation modes automatically according to the road conditions. In order to achieve the optimum fuel economy, specifications of the power sources and CVT, smooth shifting, and battery SOC are taken into account to conduct optimization for charging efficiency and fuel consumption. Under EPA standard tests, the proposed novel hybrid CVT consume 45 and 36 mpg in urban and highway respectively, which is very competitive as compared to the other HEVs.

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