Selective catalytic reduction (SCR) is a chemical process converting nitrogen oxides (NOx) into diatomic nitrogen and water as well as a small amount of carbon dioxide. This process is facilitated by the addition of automotive-grade urea – known as Diesel Exhaust Fluid (DEF) or commercial brands like AdBlue and Bluetech – to convert hazardous NOx emissions from diesel engines into harmless nitrogen and water.
SCR功能块的工作原理
SCR模块控制泵从储罐中抽出DEF，并用适当的计量阀将其注入柴油机废气中。为了优化燃油效率，在催化还原过程之后使用气体传感器，然后将气体传感器的信息输送到柴油引擎ECU，后者将该信息与引擎状态相结合，向SCR单元提供有关待释放的正确DEF液体量的准确信息。
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