汽車二次空氣導入及溫度對觸媒轉換器影響之研究

Study on Secondary Air Injection And The Effect of Temperature on Catalytic Converter for Automobile

謝東甫(Tung-Fu Hsieh)

指導教授 ： 翁豊在

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2013年)

摘要

本研究主要是針對汽車排氣加入二次空氣後，可縮短觸媒轉換器溫度提升所需時間，讓觸媒轉換器提早達到工作溫度，對廢氣淨化有顯著的效果；若輔以保溫材的雙重助益下，將使觸媒轉換器工作效益再度提升，對於廢氣淨化會有更加乘的效果。
本實驗在引擎的頭段排氣歧管之處與頭段4轉2歧管之處，分別設置二次空氣導入點，並加裝單向閥利用引擎運轉在排氣管產生之正負壓而形成真空效應，讓單向閥因正負壓做機械性的開啟與關閉，將新鮮空氣注入至排氣歧管內，於進入觸媒轉換器前就先與廢氣後燃，隨後未燃燒完全之殘餘廢氣進入觸媒轉換器後再度作用，將污染物再度催化轉換成無害氣體，使最後末端排氣之污染物大幅降低，達到淨化排氣的目的；並配合耐熱材質的陶瓷纖維保溫材，研究溫度對觸媒轉換器的影響，並探討二次空氣導入與觸媒轉換器，輔以陶瓷隔保溫材的交互影響。

關鍵字

二次空氣 ； 觸媒轉換器

並列摘要

In this study, secondary air was injected into the exhaust of automobile to reduce the time needed for heating up the catalyst. By doing this, the catalyst can reach its working temperature faster, which will be beneficial for the purification of exhaust gas. To carry out the experiment, secondary air was injected at two locations, namely the head exhaust manifold and the head 4-in-2 exhaust manifold of the engine. In addition, one-way valve was installed to create vacuum effect inside the exhaust pipe, resulting from the positive/negative pressure formed when the engine is in operation. The mechanical operation (open/close) of the one-way valve was controlled by the positive/negative pressure to allow fresh air to enter into the exhaust manifold. The entered fresh air was then burned with the exhaust gas before entering the catalytic converter, leaving the unburned residual exhaust gas to go into the catalytic converter. Finally, catalytic reactions conducted inside the catalytic converter transformed pollutants into harmless gases which then left the tail pipe of the exhaust system, achieving the goal of exhaust gas purification. Furthermore, thermal insulating material, such as ceramic fibers, was adopted to study the effect of temperature on the catalytic converter performance. The interaction between secondary air injection, three-element catalytic converter and ceramic thermal insulator was also investigated.

並列關鍵字

secondary air ； catalytic converter

參考文獻

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