What does the acronym EGR stand for in automotive terms?

The acronym EGR stands for Exhaust Gas Recirculation. This is a crucial system in modern automotive engineering that helps reduce nitrogen oxide (NOx) emissions, which are a major contributor to air pollution and smog. The EGR system works by recirculating a portion of the engine's exhaust gases back into the intake manifold.

This process lowers the combustion temperature in the engine, which, in turn, reduces the formation of NOx gases. The use of EGR is particularly important in meeting stringent emissions regulations and improving overall engine efficiency. Understanding the function of EGR is essential for anyone involved in automotive maintenance, engineering, or appraisal, as it is a common feature in many newer vehicles and a key component of their emission control strategy.