What does it mean for China V vehicles to consume urea?
2 Answers
China V vehicles consuming urea is primarily aimed at reducing harmful nitrogen oxides in the exhaust into nitrogen and water. Conditions for urea consumption: Urea injection occurs only when the exhaust temperature sensor reaches 180 degrees, and the nitrogen oxide sensor increases the urea injection volume when detecting substandard exhaust emissions. After the exhaust exits the engine and the exhaust temperature sensor reaches 180°C, it sends a signal to the ECU, which then commands the urea pump to start working, building and storing pressure. When the pressure reaches the standard level, the urea nozzle begins operating. Injected urea decomposes into ammonia and water under high temperatures, which then react with the exhaust in the catalytic converter. Ammonia reacts with nitrogen oxides in the exhaust to produce water and nitrogen, completing the post-treatment process and ensuring the exhaust meets quality standards. Reasons for high urea consumption: When the nitrogen oxide sensor detects that the vehicle's exhaust does not meet standards, it increases urea injection. The exhaust temperature sensor sends a signal to the computer at 180 degrees to start urea injection. If the exhaust temperature sensor malfunctions and urea injection starts before reaching 180 degrees, it leads to excessive urea consumption. Issues with the urea pump, such as internal failures causing pressure build-up to fail, or air-assisted urea pumps, can also result in higher urea consumption. Road conditions, such as long-term driving on mountainous or undulating roads, can cause incomplete combustion in the vehicle's engine.
Adding urea to China V vehicles is actually a crucial part of the emission system. Having driven trucks for ten years, I know this very well. Diesel engine exhaust contains nitrogen oxide pollutants that often exceed standards significantly, and this SCR system is specifically designed to address them. The urea tank is usually located on the chassis, and after every few hundred kilometers, the dashboard will remind you to refill it. Don’t take it lightly—I once delayed refilling, which led to nozzle clogging, and the repair cost was nearly half a month’s income. I recommend that vehicle owners regularly check urea levels and purchase products from reputable manufacturers, as using inferior products can clog the nozzle and cause even more trouble. In fact, newer China VI vehicles now consume about 30% less urea, which is a sign of technological progress.
