This is where the EGR cooler comes into play. The DPF works in harmony with the EGR valve to reduce both harmful oxides of nitrogen and carbon particles from entering the atmosphere.Īs the diesel engine is the biggest offender when it comes to these emissions, their petrol-powered brethren are usually only fitted with an EGR valve.Īs emissions targets became stricter across the world, manufacturers had to come up with more efficient EGR operation to further reduce their impact. This is where another emissions control device comes in - the diesel particulate filter (DPF) The downside of reducing these oxides of nitrogen by utilising an EGR valve is the increased level of carbon particulates produced. This is one of the most harmful types of gas for our environment and is produced in high combustion temperatures, such as in diesel engines. This gas is cooler than the combustion temperature inside the cylinder, which reduces the production of oxides of nitrogen. It operates by recirculating exhaust gas back into the engine through the intake. The EGR is usually located on the inlet manifold of the engine, although sometimes it can be located lower down near the exhaust manifold. One of these devices is known as the Exhaust Gas Recirculation valve - or EGR for short.

Thankfully, manufacturers have been trying to combat these harmful emissions, implementing many emissions control devices to reduce the impact on the environment. The well-timed ignition of the air and fuel mixture that provides the drive to power us forward to our destination is a wonder in itself but, unfortunately, there are side effects to this process - mainly, harmful exhaust emissions. When was the last time you thought about what’s happening under the bonnet of your car?Ī lot of us take for granted the fact we can just jump in, hit the key and be on our way, but we never really give a thought to the complex process happening just in front of us.

What does a egv valve do