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The exhaust system is what carries the exhaust fumes (gasses) from the engines combustion chamber to the atmosphere, and reduces the engine noise. Exhaust gasses leave the engine from a pipe, then travels through a catylic converter, and a muffler before exiting through the tailpipe.
Reactions thta take place inside the catalyc converter change most of the hazardous hydrocarbons and carbon monoxide produced by the engine into harmless water vapor and carbon dioxide.
The conventional muffler is an enclosed metal tuve packed with sound-deadening material. They are usually round or oval shaped.
Some car manufacturers are testing an electronic muffler, which uses sensors to monitor the sound waves of the exhaust noise. The sound wave data is sent to a computer that controls speakers near the tailpipe. THe system generates sound waves 180 degrees out of phase with the engine noise. The sound waves from the electronic muffler collide with the exhaust sound waves and cancel each other out. This leaves only the lol-level heat to emerge from the tailpipe. |
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