Taking a single exhaust system as an example, during the operation of the engine crankshaft, exhaust gas enters the exhaust system through the exhaust manifold. Usually, car exhaust pipes are segmented in order to install different components in the middle of the exhaust system. Although there are differences in exhaust systems such as single row single output, single row dual output, double row single output, and double row dual output, their main components cannot be separated from several major parts: exhaust manifold, exhaust pipe, sensor, three-way catalytic converter, car muffler, and exhaust tailpipe.
The function of the exhaust manifold is to introduce the exhaust gas from the engine exhaust process into the exhaust system; The function of a three-way catalytic converter is to convert harmful gases such as CO, HC, and NOx in the exhaust into harmless gases such as carbon dioxide, nitrogen, hydrogen, and water. This is also the reason why it is called a three-way catalytic converter.
The main function of a muffler is to control the exhaust sound, and it is precisely because of its existence that the exhaust sound of a car meets the requirements of regulations. Therefore, the main function of the exhaust system is not only to reduce noise, but also to meet the requirements of exhaust gas disposal.
Waste gas disposal can be completed through chemical reactions. So, how is the noise reduction function accomplished? What determines the length and thickness of pipelines? To clarify these issues, it is also necessary to understand how exhaust sound is composed.
