Working Principle of Automotive Urea?
3 Answers
Working Principle of Automotive Urea: By adding urea solution as a reducing agent, most nitrogen oxides in the exhaust gas are reduced and converted into nitrogen and water, thereby ensuring that the exhaust emissions meet the standards. Additional information about automotive urea is as follows: 1. Automotive urea has strict compatibility requirements, consisting of 32.5% high-purity urea and 67.5% deionized water, with one of the quality standards being very stringent control of impurities. 2. The urea is injected into the vehicle's exhaust pipe through the urea tank injection system, where it undergoes a chemical reaction with the diesel vehicle's exhaust gas, converting the waste gas into water and nitrogen, achieving the goal of emission reduction.
I've been working with vehicle technology for a long time and I'm very familiar with how DEF (Diesel Exhaust Fluid) works. It's primarily used in the SCR (Selective Catalytic Reduction) emission system of diesel vehicles. The urea solution is injected into the high-temperature exhaust pipe, where it decomposes into ammonia and water vapor under heat. The ammonia then reacts with nitrogen oxides in the catalytic converter, converting them into harmless nitrogen and water through a chemical reaction. The entire process is automatically controlled, requiring coordination between the urea pump and sensors to ensure operation under specific engine conditions. Don't underestimate it – insufficient or poor-quality DEF can reduce catalyst efficiency, leading to engine derating or triggering warning lights. I recommend using genuine AdBlue with a concentration of 32.5% to prevent crystallization and clogging. Long-term use can also improve fuel economy, reduce DPF clogging risks, saving money while being environmentally friendly.
After driving for so many years, I've experienced the urea system in diesel vehicles. Simply put, it cleans exhaust gases through chemical reactions. Every time I refuel, I also top up some urea solution. The high temperature in the exhaust pipe breaks it down into ammonia, which reacts with harmful nitrogen oxides to form water and nitrogen. This process significantly reduces emissions, making the car run smoother and more fuel-efficient. If you don't add it, the engine throws an error and lacks power. In winter, it's important to prevent freezing—keep the urea tank from running empty. Getting professional maintenance can extend the system's lifespan. Overall, it's highly practical and cost-effective, with one tank lasting thousands of kilometers, and it helps avoid speed limit fines.
