What does EGR mean in cars?
2 Answers
EGR in cars refers to the Exhaust Gas Recirculation system. Here is a related introduction to automotive EGR: 1. The EGR system in vehicles is designed to reduce NOX emissions from automobile exhaust, ultimately decreasing atmospheric pollution. 2. There are two conditions for NOX generation: high temperature and oxygen abundance. Since exhaust gases contain large amounts of CO2, which cannot burn but can absorb significant heat. 3. Therefore, introducing exhaust gases into combustion can lower the combustion temperature of the air-fuel mixture in the cylinders, improving the high-temperature oxygen-rich condition, thereby effectively suppressing NOX emissions.
EGR in automobiles refers to the Exhaust Gas Recirculation system, which means recirculating a portion of the exhaust gases back into the engine for another combustion. The primary purpose of this is to lower combustion temperatures and reduce harmful nitrogen oxide emissions, meeting environmental standards. I understand that this system became popular several decades ago, and most modern vehicles are equipped with it to help protect the environment. The benefits include reduced fuel consumption and pollution, but if the EGR malfunctions—such as a stuck valve or severe carbon buildup—the car may experience reduced power, sluggish acceleration, or a sudden increase in fuel consumption. It is recommended that car owners inspect the EGR system every two to three years, especially for those frequently driving short distances in urban areas, as carbon buildup can easily clog the system and affect performance. Cleaning the EGR valve is relatively inexpensive, and neglecting it can damage the engine and increase repair costs. I believe that as an average car owner, knowing these details can help save money and hassle during maintenance.
