Which of the following best describes the intended function of a C-EGR system on a diesel engine?

The function of a Cooled Exhaust Gas Recirculation (C-EGR) system on a diesel engine is specifically designed to reduce nitrogen oxide (NOx) emissions by recirculating a portion of the exhaust gas back into the engine's intake system. By diluting the intake charge with cooled exhaust gases, the C-EGR system effectively lowers the combustion temperature within the cylinders. This reduction in temperature is crucial because it helps to minimize the formation of NOx, which is a harmful pollutant that occurs at high temperatures during combustion.

The cooled exhaust gas, being introduced back into the intake system, helps in achieving a more efficient combustion process, as it lowers the peak combustion temperatures that lead to NOx formation. In addition, the cooling of the recirculated exhaust gas also contributes to increased engine efficiency and performance under certain operating conditions.

This understanding of the C-EGR system illustrates the importance of managing emissions while still maintaining engine performance, which is a critical concern in modern diesel engine design and operation.