28-01-2016, 11:06 AM
Purpose: control emissions and exhaust from vehicle .
Turn the harmful gases the car manufactures into harmless ones that don't ruin the environment
Problem gases :
hydrocarbons (unburned) HC
carbon monoxide CO
nitrogen oxides NOx
sulfur dioxide SO2
phosphorus P
lead and other metals Pb
Three (major) Pollutants
Hydrocarbons (HC)
Un-burnt Gasoline
Carbon Monoxide (CO)
CO results from the incomplete combustion Fuel
Oxides of Nitrogen (NOx)
NOx results from air being overheated.
HC
HC results from gasoline that is not burned in the engine. This can be due from misfires, burning rich, open loop operation, or excessive cranking.