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標題: 機車觸媒劣化模擬與點火失效對引擎性能及汙染之影響
Simulation of catalyst deterioration and the effect of misfire on the emission and engine performance of motorcycle engine
作者: 巫昶泰
Wu, Chang Tai
關鍵字: 觸媒劣化;Catalyst;機車引擎;點火失效;OBD;deterioration;motorcycle;engine;misfire;OBD
出版社: 機械工程學系所
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本篇論文探討以旁通管方式模擬觸媒劣化的可行性,以及點火失效對於引擎汙染排放及性能的影響。車上診斷系統(On Board Diagnostic, OBD)發展過程當中需要一套認證程序檢測系統的功能性,以確保診斷系統能夠確實偵測出汙染排放相關元件的劣化或故障,降低車輛的汙染排放。OBD系統認證程序中的觸媒劣化檢測項目,其檢測方式為使用已劣化的測試觸媒進行測試,且劣化程度必須使汙染物排放量剛好等於OBD系統監測的門檻值,以測試OBD系統的準確性。然而測試觸媒一般使用長時間加熱的方式加速劣化,但此方式不易控制且造價昂貴,因此本研究使用旁通管模擬不同劣化程度的觸媒。本研究使用機車引擎於引擎動力計與底盤動力計測試模擬裝置的可行性,並利用含氧感知器訊號計算出觸媒劣化指標。實驗結果顯示可藉由調整旁通閥的開度控制排氣系統下游汙染物排放量,模擬不同劣化程度的觸媒。本文亦建立觸媒零維模式驗證排氣系統模擬觸媒劣化的可行性。

A novel approach to simulate the catalyst deterioration and the effect of misfire on emission and engine performance are discussed in this paper. In the development of the OBD system of a vehicle, an aged catalyst is required to test the function of the system. This catalyst is partially deteriorated and the emission after this catalyst will exceed the regulation value with limited bound according to the testing protocol. This aged catalyst is very valuable, and difficult to prepare. A bypass in the exhaust pipe was used to simulate the deterioration of catalyst in this paper to investigate the emission characteristics of a motorcycle engine. This method of simulation has been conducted in a dynamometer testing and a chassis dynamometer testing. An electronic controlled motorcycle engine was used in these tests. Wind band oxygen sensors’ signals were used to calculate the catalyst deterioration index. The result shows that the degree of deterioration can be controlled by the portion of exhaust flow through the parallel pipe. A low dimensional catalyst model was built to confirm the practicability of the exhaust system made in this paper.
A misfire generator based on single chip was developed in this paper to investigate the effect of misfire on the emission and engine performance of a single cylinder motorcycle engine. The results of the engine dynamometer tests show that the concentration of unburned hydrocarbons in the engine exhaust was raised and the engine torque declined as the misfire rate increased. At low load, CO concentration increased with the misfire rate while CO2 moved in an opposite direction. Contrary condition happened at high load. The CO2 concentration increased with the misfire rate while CO varied in the opposite way.
其他識別: U0005-3101201316331500
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