What is the purpose of an exhaust emission system - Answers

Medic by Gunk M5512/6 Exhaust Medic Emissions System Cleaner - 12 oz

1996-2000 Toyota 4Runner 3.4L Federal Emissions Resonator Muffler Exhaust System Kit

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  • TAG : Exhaust Systems | Emissions | Mufflers - Midas
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  • The exhaust system is used to remove the burned air/fuel mixture, or exhaust, from the engine, away from the passenger compartment and out the back of the vehicle. The major components of the exhaust system are the exhaust manifold(s), exhaust pipes, catalytic converter(s), muffler and oxygen sensors. The AIR (Air Injection Reaction) system and EGR (Exhaust Gas Recirculation) system are part of the exhaust and emission control systems. The exhaust manifold(s) provide a pathway for exhaust gases from the engine’s cylinder head exhaust ports. The exhaust pipes convey the exhaust to the rear of the vehicle. There are single exhaust systems that have one pipe and dual exhaust systems that have two. V6 and V8 engines have dual exhaust or can have single exhaust by utilizing a crossover pipe that connects the exhaust from both banks and channels it into one pipe. Part way down the pipes is at least one muffler that reduces engine exhaust noise. Some systems also have a smaller muffler called a resonator. The last section of exhaust pipe is called the tailpipe.

    One of the first-developed exhaust emission control systems is secondary air injection. Originally, this system was used to inject air into the engine's exhaust ports to provide oxygen so unburned and partially burned hydrocarbons in the exhaust would finish burning. Air injection is now used to support the 's oxidation reaction, and to reduce emissions when an engine is started from cold. After a cold start, an engine needs an air-fuel mixture richer than what it needs at , and the does not function efficiently until it has reached its own operating temperature. The air injected upstream of the converter supports combustion in the exhaust headpipe, which speeds catalyst warmup and reduces the amount of unburned hydrocarbon emitted from the tailpipe.

  • FIG. 4 is another block diagram of an optical arrangement for the analyzer of the remote vehicle exhaust emission monitoring system according to the invention.

    FIG. 4 is another block diagram of an optical arrangement for the analyzer of the remote vehicle exhaust emission monitoring system according to the invention.

  • FIG. 4 is another block diagram of an optical arrangement for the analyzer of the remote vehicle exhaust emission monitoring system according to the invention.

Auto Upkeep - Exhaust and Emissions

This invention relates to an exhaust emission monitoring system and more particularly relates to a spectroscopic absorption remote sensing instrument for multi-component analysis of exhaust plumes emitted by in-use vehicles.