傳統引擎車輛有兩種耗能缺失，一是煞車造成的動能損失，另一是引擎運作於低效率區，本文主旨在利用串聯式液壓混合車解決這兩種耗能問題。串聯式液壓混合車使用液靜壓傳動系統，藉由此系統的工作特性迫使引擎運作於高效率區，並利用液壓蓄壓器作為儲存煞車動能之元件。串聯式液壓混合車的速度控制可分為狀態控制與速度追蹤控制，根據車輛的行駛狀態，利用邏輯決策控制液壓迴路系統於正確之狀態，藉由對二次元件斜板角度的控制，可達成速度追蹤控制。現今油電混合車多屬於並聯式混合車，僅具有回收煞車動能之能力，無法使引擎工作於高效率區，導致節能效益僅約為17~23 %。然而本文建構一模擬系統，同時模擬傳統引擎車與串聯式液壓混合車的行駛耗能，可知串聯式液壓混合車的節能效益平均可達44 %，市區行駛的節能效益更是高達67 %。

Conventional vehicles with internal combustion engine have two defects which causing energy consumption. One is the loss of the braking energy, the other is low operating efficiency of internal combustion engine. The purpose of this article is to solve these two energy consumption problems with series hydraulic hybrid vehicle (SHHV). Series hydraulic hybrid vehicle uses a hydrostatic driving system. And, with this system, the engine would be forced to operate at high efficient region. The driving system uses hydraulic accumulator as energy saving device to save braking energy. The speed control of the SHHV can be divide to two parts, state control part and speed tracking control part. According to the driving situations, the control system uses the logic decision-making to control the hydraulic circuit in the correct state. And then, with the control of the swash-plate of the secondary component, the speed of the SHHV can be tracked, accurately. Nowadays, the electric hybrid vehicles are mostly parallel hybrid. They only have braking energy recovery system, and can not promote the operating efficiency of engine. Therefore, the energy efficiency of the electric hybrid vehicles are only about 17~23 %. However, in this article, a simulation programing system has been constructed, and the driving energy consumption of both the conventional vehicle and the SHHV have been simulated. And, the energy efficiency of the SHHV is up to 44% on average, and in city driving part, is up to 67%.

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