IC Engine Practice Test: Engine Emissions and their Control — Flashcards

Engine Emissions and their Control topics include: Engine and hydrocarbon emissions, catalytic converters, ci engines, chemical methods and exhaust gas recirculation.

Engine emissions can be controlled in three ways:
More complete combustion: This leads to fewer byproducts.
Reintroduce hydrocarbons: This can be done back into the engine for combustion.
Additional combustion area: This can provide an additional area for oxidation or combustion to occur. 

Exhaust emissions from engines contribute to environmental pollution and greenhouse gases on a global scale. 

Here are some other ways to control engine emissions:
EGR valve: This component redirects exhaust gases back into the engine to reduce emissions. If the EGR valve becomes clogged, it can cause a misfire.
Evaporative emissions: These are controlled in modern cars and trucks by a closed system that limits or eliminates releases of fuel vapor into the air.
Selective catalytic reduction: This technology is designed to reduce diesel engine emissions. In heavy duty commercial trucks, SCR can reduce emission to near-zero levels while also delivering a 3-5% fuel savings.
Diesel particulate filters: These are designed to filter out all diesel particulate matter from your exhaust fumes, thus reducing the emissions of your car.