How to Adjust a National 5 Urea-System to Reduce Consumption?
3 Answers
Adjusting such equipment requires professional guidance. Additional Information: 1. Introduction to Urea: Diesel Exhaust Fluid (commonly known in China as automotive urea, vehicle urea, or automotive environmental urea) is a consumable necessary for SCR technology. The SCR system includes a urea tank and an SCR catalytic reaction tank. 2. Operation Process of the SCR System: When nitrogen oxides are detected in the exhaust pipe, the urea tank automatically sprays diesel exhaust fluid. The diesel exhaust fluid and nitrogen oxides undergo a redox reaction in the SCR catalytic reaction tank, producing non-polluting nitrogen and water vapor, which are then discharged. 3. Impact of Not Using Urea: Failure to load diesel exhaust fluid, or using fluid of insufficient purity or inferior quality, will cause the vehicle's engine to automatically decelerate. Additionally, inferior-quality diesel exhaust fluid can contaminate the catalyst in the SCR catalytic reaction tank, leading to serious consequences.
I've been driving trucks for many years, and the urea system on those National V diesel vehicles really consumes a lot, but it's not easy to adjust it to burn less. The SCR system automatically controls urea injection based on engine parameters to reduce NOx emissions. Trying to manually reduce it might trigger alarms or lead to penalties for exceeding limits. However, there are ways to lower consumption: drive steadily, avoid sudden acceleration and hard braking, especially don’t speed on highways—urea sprays more frequently then. Make it a habit to check the urea tank for leaks, ensure the filter isn’t clogged, and use antifreeze AdBlue in winter. I’ve tried it—maintaining a steady speed can save 10%-20% on consumption, saving money and being eco-friendly. Don’t listen to those who suggest tampering with the ECU to trick the system—it’s illegal, damages the vehicle, and risks hefty fines if caught during inspections. Regular maintenance is the most reliable approach. Find a trustworthy shop to check the nozzle and pump condition—don’t skimp on small costs and end up with big losses.
As someone who works on cars every day, I advise against directly reducing urea consumption—it can cause trouble. The China V system has sensors monitoring it. If you lower it and emissions exceed standards, the system will trigger fault codes or even lock itself. A more practical approach is to optimize maintenance to reduce consumption: first, check if the urea nozzle is clogged—if it doesn’t spray smoothly, it’ll spray more; replace aging filters; use a reputable brand of AdBlue and avoid diluting it with water. When driving, keep the RPMs from getting too high, and warm up the car before driving—this reduces NOx generation, naturally lowering urea usage. I’ve seen many cases where well-maintained cars use 30% less urea. Never cut corners by modifying the ECU or disconnecting sensors—fines and repair costs can quickly exceed the car’s value. Remember, safe driving and regular servicing are the right way to go.
