The benefits of exhaust gas recirculation (EGR)

One of the technologies available for the reduction of oxides of nitrogen (NOx) is exhaust gas recirculation (EGR). Meeting the various global emissions challenges, EGR works by reducing the amount of oxygen in the cylinder, which lowers combustion temperatures. It’s an efficient process for reducing NOx.

Exhaust gas recirculation (EGR) is used to reduce the levels of NOx emitted by the engine. By recirculating exhaust gases into the engine’s cylinder, a percentage of the air is replaced with CO2. This process lowers the combustion temperature due to the reduced amount of oxygen which, in turn, reduces the amount of NOx formed.

The exhaust gases can either be externally cooled and piped into the inlet manifold or managed internally through the camshaft.

What are the strengths of EGR?

• EGR is an efficient process for reducing NOx levels. It is a proven technology in on- and off-highway applications
• The impact of EGR on the engine packaging or envelope is minimal
• EGR is commonly used in off-highway applications
• EGR-based systems can benefit from improved fluid consumption over non-EGR systems