SCR requires the addition of DEF (Diesel Exhaust Fluid) to the system as needed consumption rates are dictated by engine usage. The disadvantages of SCR are mainly logistical. Also, the engine is not operating at its optimal combustion temperature, consequently reducing fuel efficiency and engine power.The advantages of an SCR system is that it allows the engine to operate at higher temperatures in order to optimize performance, meanwhile reducing NOx levels. However, the cooler combustion produces more particulate matter due to the less efficient operating temperature. The combustion temperature in the cylinder is reduced, thus lowering NOx production.
In an EGR system, exhaust gas is cooled and recycled back through the engine. EGR was the technology that most manufacturers used to meet the first rounds of emissions regulations in 20. How does EGR work and why is this technology essentially being replaced by SCR?ĮGR stands for Exhaust Gas Recirculation.
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