What does the acronym 'DEF' stand for in diesel technology?

In diesel technology, 'DEF' stands for Diesel Exhaust Fluid. This fluid is a key component in reducing nitrogen oxide (NOx) emissions from diesel engines, particularly in vehicles equipped with Selective Catalytic Reduction (SCR) systems. DEF is a solution composed of 32.5% urea and 67.5% deionized water, which when injected into the exhaust stream, reacts with NOx emissions and converts them into nitrogen and water vapor, harmless byproducts.

The use of DEF is vital for meeting stringent emissions standards set by regulatory agencies. It helps diesel engines operate more efficiently and adhere to environmental regulations, making it an essential aspect of modern diesel engine technology. Understanding the role and composition of Diesel Exhaust Fluid is crucial for technicians in the heavy duty equipment sector as they work on emission control systems and ensure that equipment complies with legislative requirements.