Most vehicles today rely on diesel engines as they are the most powerful internal combustion engine available on today’s market. All over the world, heavy duty trucks, buses, off road machinery etc. rely almost exclusively on diesel engines, and passenger cars are now a very popular option too.
To date, there is no other option available to vehicle manufacturers that offers the same power as a diesel engine. Over the last number of years, governments all over the world have intensified their focus on climate change and ultimately, a reduction in NOx emissions from diesel powered vehicles. In order to comply with the new emissions standards, vehicle manufacturers have adapted their systems to provide the same power and efficiency from a diesel engine, but with a massive reduction in NOx emissions. This is achieved through a Selective Catalytic Reduction (SCR) System. A liquid reductant agent, known as AdBlue, is injected into the SCR system from the AdBlue tank in the vehicle. The AdBlue then travels to the catalyst where reactions occur to convert the nitrous oxides (NOx) into harmless nitrogen and water (commonly found in the air we breathe) and enters the atmosphere through the exhaust.
The European emissions standards were introduced a number of years ago as a way for governments to regulate the NOx emissions. These standards define the acceptable limits for exhaust emissions of new vehicles sold in the EU and EEA member states using a series of EU directives to stage the progressive introduction of the increasingly stringent standards. Countries around the world are using these standards, with some begin at a more developed stage that others.