What is the Purpose of Evaporative Emissions Systems?

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Purpose of Evaporative Emissions Systems:

The purpose of evaporative emissions systems is to cut back or eliminate the discharge of vaporized HC (Hydrogen Peroxide) into the atmosphere. The HC vapors, like volatile organic compounds (VOCs), react within the atmosphere with nitrogen oxides (NOx) and contribute to the formation of ground-level ozone and photochemical smog. Ground-level ozone is an air pollutant with harmful effects to plants, human respiratory systems, and an irritant to our eyes.

The major source of evaporative emissions is from the equipment and, therefore, it’s not surprising that fuel injection system technology provides significant evaporative emissions benefits. The second major source of evaporative emissions comes from the positive crankcase ventilation (PCV) system. PCV systems collect and consume fuel that’s pushed by the piston rings during the compression and power strokes in a very 4-stroke (4-cycle) engine. These systems are used on automobiles since the 1960s within the variety of PCV valves.

Evaporative emissions regulations are in effect for automobiles since 1970 in California. Mechanical system systems effectively eliminated the vaporization of fuel from open carburetors. Evaporative emission control systems on cars have increased in complexity over the years to attain the extremely low evaporative emissions (0.054g/day) from the equipment by California’s Partial Zero Emission Vehicle (PZEV) “zero” evaporative emission limits. Other significant sources of evaporative emissions from the equipment include permeation of the fuel tank and fuel delivery hoses.

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