本研究主要目的為建立四行程內燃機混合動力系統，並探討其應用於電動自行車續航力之可行性，本實驗將使用XY139F-7四行程引擎建立一套發電系統，並量測此引擎各油門值的功率及油耗，以此結果與純電力系統及純燃油系統進行比較。
根據實驗結果，引擎於油門值60 %且負載電流於18.7 A時，產生輸出功率為646 W、比燃油消耗率為668.8 g/(kW·h)，引擎熱效率為16.1 %、整體系統熱效率達7.9 %，此時比燃油消耗率及系統熱效率為最佳狀態；若比較混合動力系統與電池供應系統於相同重量情況下，以48 V、1000 W馬達規格做為負載假設，混合動力系統裝載1.45 L之燃油，將可使比能量高於純電池系統，比能量為170.7 Wh/kg、航程時間為2小時46分54秒、航程距離85.6 km；在模擬混合動力與純燃油系統的怠速比對分析中，在相同燃油消耗5公升時，混合動力系統的航程距離 (163.8 km) 大於純燃油系統 (146.5 km) 。
經研究結果可知此混合動力系統能保持較佳燃油效率，利用電池蓄電，即可使負載端有增程效果，因此吾人認為混合動力系統應用於電動自行車上為一可行方案。

The main purpose of this research is to establish a four-stroke internal combustion engine hybrid power system, and to discuss the feasibility of its application in the endurance improvement of electric bicycles. The first stage is to build a micro power generation system by using XY139F-7 four-stroke internal combustion engine as the power source of the power generation system, and to obtain the best power point of each throttle. The second stage is to analyze and compare the endurance of the hybrid power system and the battery supply system on the basis of a simulated vehicle voyage.
According to the experimental results, when the engine is at 60 % throttle and load current is 18.7 A, the output power, specific fuel consumption rate, engine thermal efficiency, and the overall system thermal efficiency are 646 W, 668.8 g/(kW·h), 16.1 %, and 7.9 %, respectively. At this time, the specific fuel consumption rate and system thermal efficiency are in the best condition. If the hybrid system and battery power system have the same weight, and the 48 V, 1000 W motor are used as the load setting, the hybrid power system loaded with 1.45 L of fuel will make the specific energy higher than that of the battery supply system, and the specific energy, endurance time, endurance distance of the hybrid power system are 170.7 Wh/kg, 2 hour, 46 minutes and 54 seconds, and 85.6 km, respectively. In the comparison of the idling speed between the simulated hybrid and pure engine system, When the same fuel consumption is 5 liters, the cruising range of the hybrid system (163.8 kilometers) is greater than that of the pure fuel system (146.5 kilometers).
The research results show that this hybrid system can maintain better fuel efficiency, the use of battery storage can increase the endurance of the original engine system. As a result, the application of hybrid power system in electric bicycles is a feasible solution.

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