What is the Working Principle of Vehicle Urea?
2 Answers
Vehicle urea works by reacting with exhaust gases to reduce pollutant emissions. Below is extended information about vehicle urea: 1. Urea usage reduces CO and NO in exhaust gases, converting them into harmless CO2 and NO2. 2. After urea injection, the mist undergoes redox reactions with high-temperature exhaust gases, with the oxidized portion being fully oxidized substances. 3. Under the action of SCR technology, urea solution can optimize engine performance and fuel consumption. Diesel consumption can be reduced by up to 3% to 6%, significantly lowering costs and NO emissions.
I've been in auto repair for many years, and the diesel vehicle urea system is quite common. It sprays a special liquid containing urea into the exhaust pipe, which decomposes into ammonia and carbon dioxide at high temperatures. The ammonia then reacts with harmful nitrogen oxides in the exhaust on a catalyst, converting them into harmless nitrogen and water vapor, significantly reducing pollutant emissions. The entire process is automatically controlled by the SCR system, with pumps drawing the liquid and injectors spraying it, all while monitoring fluid levels and temperature. Skipping urea isn't an option—the vehicle will limit power and may trigger a fault light. A reminder to everyone: check the urea tank every few thousand kilometers; don't wait until it's empty. In winter, use antifreeze-type fluid to prevent nozzle clogging from freezing. It's low-cost but helps vehicles meet environmental standards, especially heavy-duty trucks, which rely on it. I've seen many owners neglect it, only to face doubled repair costs, so regular maintenance saves hassle and money. Simply put, urea acts as a cleaner, turning exhaust gases harmless, and it works well.
