exhaust emission controls
- exhaust emission controls
Systems or adjustments designed to limit noxious gases in an engine's
exhaust. Such controls can be grouped into two broad categories: those designed to reduce or eliminate the formation of harmful pollutants in the engine itself (e.g.,
retarded spark setting) and those designed to destroy or otherwise alter the pollutants after they have been formed (e.g.,
air injection, thermal reactors, and catalytic converters). Evaporative emission controls prevent
gasoline vapors from escaping into the atmosphere from the
fuel tank and
carburetor and
crankcase controls recycle fumes from the
crankcase through the engine.
Dictionary of automotive terms.
2015.
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