串聯式液壓混合動力車，為新時代之節能車款，傳統車輛有兩種缺點，一是引擎運作於低效率區間(15~16%)、二是煞車造成的動能損失，串聯式液壓混合動力車能夠解決以上兩種問題。使用液靜壓迴路取代機械傳動系統驅動車體，可使引擎工作於高效率區間(37~38%)，亦可於煞車過程中回收車體之動能，故特別適用於大型且走走停停之車輛，例如:巴士，垃圾車，貨車等，此應用在歐美已行之有年，例如:UPS串聯式液壓混合動力貨運車。本文將實際量測可變量液壓馬達之效率，包括容積效率及體積效率，並利用量測結果，以3.5噸之小貨車為背景，分析將其改裝為串聯式液壓混合動力車所需之液壓迴路架構；配合不同行駛模式下之串聯式液壓混合動力車之數學模型，建立不同行駛模式下完整之液靜壓迴路整體數學模型；最後藉由模擬行駛評估串聯式液壓混合動力車之節能效益。由軟體模擬結果可知，串聯式液壓動力車相較於傳統車輛約可節省40~50%之油耗；並由自訂路線模擬中得知不同煞車力道下之動能回收效率，約於25%~60%之間。

Series Hydraulic Hybrid Vehicles(SHHV) is an energy saving of new era which use hydrostatic circuit to replace tradition mechanical transmission, which allowed engine work in high efficiency region and recover vehicle’s kinetic energy during braking.Series Hydraulic Hybrid Vehicles was use in Europe.EX:The UPS.In this article will measure Variable Displacement Hydraulic Motor Efficiency including Volumetric efficiency and Mechanical efficiency and use then.Base on 3.5 tons of small truck is used as background to analysis the hydraulic circuit structure of SHHV.By selecting the appropriate specification of hydraulic components and analyzing the mathematical model of hydraulic components, complete hydrostatic mathematic model of SHHV in different driving mode is established. Finally, the energy saving efficiency of SHHV will be discussed. From the simulation results, the fuel consumption of SHHV is about 40 to 50 percent less than traditional vehicle, and use self definition route to find different brake force efficiency, about 25 to 60 percent.

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