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Because more NOx is created as peak combustion temperature rises, the EGR valve effectively reduces the amount of NOx produced by the engine.

This lowers the amount of Oxygen and increases the water vapour content to the combustion mixture which reduces the peak combustion temperature. EGR systems recycle a portion of the exhaust gas back into the combustion chamber, where it combines with fresh intake air.

The majority of modern vehicles incorporate EGR valves into their design to reduce NOx emissions and therefore meet stringent emissions regulations. Therefore, incorporating EGR systems into the design of a car is important with regards to lowering harmful emissions to save the environment and have a positive impact on human health. NOx is a major component of smog and can have detrimental affects on human health as well as well as ecosystems and agricultural crops. Nitrogen oxides are emissions produced as a by-product from the process of combustion, Nitrogen and Oxygen gases in the air react during combustion, especially at high temperatures. The function of the EGR valve is to control the flow of exhaust gas being recirculated depending on the engine load. It connects the exhaust manifold to the intake manifold and is controlled by either a vacuum or a built-in electric step motor. The EGR valve is the main component of the EGR system and it's normally closed. The EGR system works by returning a small portion of exhaust gas to the engine's combustion chambers through the intake manifold, lowering combustion temperatures and therefore reducing the amount of NOx emitted. Within modern internal combustion engines, Exhaust Gas Recirculation (EGR) is a method to control Nitrogen Oxides (NOx) emissions, produced as a by-product during the combustion process.Īir from the environment, mostly a combination of Oxygen and Nitrogen, combines with fuel and ignites inside the combustion chamber, temperatures increase and produce NOx emissions. But, what is an EGR.? What is an EGR valve? The majority of modern vehicles are designed to incorporate an Exhaust Gas Recirculation (EGR) system. One method of reducing exhaust emissions is the use of after-treatment devices. Car manufacturers are having to make adaptations to the designs of their vehicles to meet the stringent limits. Regulations are becoming increasingly strict to combat the amount of GHG emissions emitted from road transport. Exhaust emissions from road transport contributed to 21% of UK greenhouse gas emissions (GHG emissions) in 2017, according to Office for National Statistics - UK Environmental Accounts. Over recent years, climate change has been a big concern in the UK.