Exhaust Gas Recirculation (EGR)
Definition:
This is an emissions control technique for reducing oxides of nitrogen emissions in the tailpipe. A small amount of exhaust gas is recirculated back into the intake manifold to dilute the incoming air/fuel mixture. Contrary to what you'd think, it has a cooling effect on combustion temperatures that helps reduce the formation of oxides of nitrogen (See NoX). The EGR valve is the main control device in this system.
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