• Nirav Joshi
• Dr N M Bhatt

In current time, majority of the transport vehicles in developing countries like India where cost effective and for this, the predominant criteria utilize diesel engines rather than petrol engines. Usage of diesel engines was rapid since last few years which can be addressed from the sales report of many automobile companies. The reason behind this could be cost of diesel fuel and efficiency of the diesel engine when compared to petrol engine. On the other side, the main problems associated with diesel engine is the formation of high levels of NOX, which is a temperature-dependent phenomenon. It is compulsory to address this emission problem and in order to reduce NOX emissions from the engine, it is necessary to keep peak combustion temperatures under control. This critical review on the effect of Exhaust Gas Re-circulation (EGR) on the exhaust gas temperatures, NOX emissions, efficiency and other parameters. The exhaust gas temperature, NOX & hydrocarbon emissions and efficiency were compared for different percentages of hot and cold EGR for diesel. The EGR system was a very effective way for reducing NOx emission from a diesel engine, particularly at the high load of engine operation condition.

Diesel Engine, Emission, NOX, EGR

"A Review of Hot and Cold Exhaust Gas Recirculation (EGR) in Compression Ignition Engine", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 5, page no.921-926, May-2018, Available :http://www.jetir.org/papers/JETIR1805894.pdf

"A Review of Hot and Cold Exhaust Gas Recirculation (EGR) in Compression Ignition Engine", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 5, page no. pp921-926, May-2018, Available at : http://www.jetir.org/papers/JETIR1805894.pdf