| 摘要: | 本研究為對不同期數之機車的觸媒轉化劣化效率做為評估，採用的機車為S牌、Y牌、K牌三種廠牌的機車作為實驗車種。其各廠牌之機車均為環保標準期數分別為三期車、四期車、五期車排氣量都為四行程引擎125 CC的車種作為實驗車輛，實驗步驟採怠速、30km/hr、50km/hr、負載30km/hr、負載50km/hr分別紀錄測值後，將實驗車種更換原廠牌新的排氣管在以上述步驟再次測得數值作為比較，但在分別測試觸媒前及觸媒後排氣分析，分別記錄機車使用哩程數及耗油量及排氣溫度，另外也以實車作更換新觸媒轉化器，使機車行駛1000km後在量測排氣數據暸解機車觸媒轉換效率值。排氣分析儀則採用HORIBA-MEXA441GE氣體分析測量機車排放廢氣中HC、CO與CO2 濃度。
實驗結果顯示在怠速、30km/hr、50km/hr、負載30km/hr、負載50km/hr狀況下所測得的HC、CO與CO2 濃度都是合乎排氣標準。排氣前及排氣後相互必較之下，當污染物經過觸媒轉化器劣化後污染物濃度都有減少之趨勢，在怠速排氣前S牌、Y牌、K牌CO的測值為3.77%，1.51%，0.87%；排氣後1.32%，1.80%， 0.62%；相較於更換新的觸媒轉化器值為1.03%，1.09%；在30km/hr狀況下為3.82%，2.87%，1.53%。排氣後,為1.82%，2.08%，1.12%，更換新排氣管後為1.54%，1.62%。在50km/hr實驗為3.92%，2.73%和1.63%；排氣後2.44%， 1.12%，1.35%，更換新排氣管為1.63%，1.01%。負載30km/hr下為2.73%，2.18%和1.34%；排氣後為1.74%，1.85%， 1.13%；在更換排氣管分別為1.54%和1.52%負載50km/hr排氣前為2.52%，2.31%，1.31%；排氣後1.34%，2.06%和1.31%；更換後為1.08%，1.83%。引擎燃燒情況是否完全對於所排放之CO、HC 及CO2 有顯著之影響。
The study makes assessment on the catalytic conversion degradation efficiency of different-period motorcycles. Three kinds of factory motorcycles (Brand S, Y, and K) motorcycles are adopted as experimental types of motorcycle. The motorcycles of each factory are environmental standard Period three, four and five, respectively, four-stroke engine 125 CC air displacement motorcycles were used as experimental motorcycles.
Experimental procedure adopted idle speed, 30km/hr, 50km/hr, load-carrying 30km/hr, and load-carrying 50km/hr, after measured values were recorded respectively, new exhaust pipes of original factory were replaced to experimental motorcycles, and above steps were carried out again, then compared the two times measured values. However, test before and after catalyst exhaust were analyzed respectively, motorcycle usage mile number, fuel consumption, and exhaust temperature were recorded respectively, in addition, actual motorcycles were used as converters that replaced new catalyst; exhaust data were measured after the motorcycles had traveled 1000km, so as to know the conversion efficiency value of motorcycle catalyst. For exhaust gas analyzer, HORIBA-MEXA441GE gas analyzer was used to measure the concentration of HC, CO and CO2 in motorcycle exhaust gas.
Experimental results indicate that the concentration of HC, CO and CO2 measured under the conditions of idle speed, 30km/hr, 50km/hr, load-carrying 30km/hr, and load-carrying 50km/hr complies with exhaust gas standard. According to inter-comparison before exhaust and after exhaust, when pollutants are degraded through catalytic converter, their concentration has the trend of reduction. Before idle speed exhaust, the measured values of CO of Brand S, Y, and K are 3.77%, 1.51%, and 0.87%；after exhaust 1.32%, 1.80%, and 0.62%; compared with newly replaced catalytic converter, the values are 1.03% and 1.09%; Under the condition of 30km/hr, values are 3.82%, 2.87%, and 1.53%; after exhaust 1.82%, 2.08%, and 1.12%; after replacing new exhaust pipe, values are 1.54% and 1.62%. Under the condition of 50km/hr, 3.92%, 2.73%, and 1.63%, after exhaust 2.44%, 1.12%, and 1.35%，after replacing new exhaust pipe, 1.63% and 1.01%; for load-carrying 30km/hr, before exhaust, 2.73%, 2.18%, and 1.34%; after exhaust 1.74%, 1.85%, and 1.13%; after replacing new exhaust pipe, 1.54% and 1.52%; for load-carrying 50km/hr, before exhaust 2.52%, 2.31%, and 1.31%; after exhaust 1.34%, 2.06%, and 1.31%; after replacing new exhaust pipe, 1.08% and 1.83%. Whether engine combustion condition has completely influence on discharged CO, HC, and CO2. |
