The working fluid of a diesel internal combustion engine is to pressurize and raise the temperature of the natural air sucked into the cylinder during the compression stroke, and then spray high-pressure diesel into the cylinder in the form of a mist. The compressed air explodes and ignites to release heat, which is compressed. The air absorbs the fuel heat energy, and its volume expands rapidly to generate greater pressure, which pushes the piston, and the diesel fuel heat energy is converted into effective mechanical energy. After the work is done, the remaining exhaust gas is naturally discharged into the atmosphere. When the load of the diesel engine increases and the speed accelerates, in order to maintain the power balance, the fuel supply must be increased automatically or artificially, resulting in an extreme mismatch between the air and the fuel. The excess fuel, even if it is just excessive, will cause carbon monoxide ( CO ) and hydrocarbons. ( CH ) Soot is generated immediately. During the exhaust process, due to the structure of the exhaust pipe and the muffler, these exhaust gas particles that have not been fully burned are easily attached and deposited on the exhaust pipe and the inner pipe wall of the muffler. When new soot can no longer hang on the inner surface of the exhaust pipe, these new and original soot particles will inevitably be discharged into the atmosphere together.
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