What is the function of automotive urea?
2 Answers
Automotive urea is a liquid used in SCR technology to reduce nitrogen oxide pollution in diesel vehicle exhaust. It is composed of 32.5% high-purity urea and 67.5% deionized water. Automotive urea is a solution adopted by engine manufacturers using SCR technology to meet the exhaust emission standards set by environmental protection authorities. If automotive urea is not used, the vehicle will emit excessive exhaust gases. When the SCR system detects nitrogen oxides in the exhaust pipe, the urea tank automatically sprays diesel exhaust fluid (DEF). The DEF and nitrogen oxides undergo a redox reaction in the SCR catalytic converter, producing harmless nitrogen gas and water vapor. Additionally, engine performance will deteriorate, and vehicle power will decrease, as automotive urea helps optimize engine performance and fuel consumption.
I have been delving into automotive technology, and diesel exhaust fluid (DEF) is highly useful in diesel vehicles, especially for selective catalytic reduction (SCR) systems. Its core function is to convert harmful nitrogen oxides in the exhaust into harmless nitrogen and water vapor, reducing air pollution. This process requires the urea solution to be injected into the exhaust pipe, where it decomposes into ammonia upon heating to participate in the reaction. In practical driving, this ensures the vehicle passes emission tests and prevents excessive pollution. When refilling, you can use dedicated dispensers at gas stations or purchase AdBlue in containers—just top it up every 5,000 kilometers. However, don’t overlook it; if the DEF level is low, the dashboard will display a warning light, and the engine may reduce power, affecting driving safety. Also, avoid mixing it with other liquids, as this can damage the catalytic system and increase repair costs. Regular checks will keep it functioning efficiently, ensuring smooth driving in both urban and highway conditions.
