| Summary: | 碩士 === 國立虎尾科技大學 === 機械與機電工程研究所 === 101 === 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.
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