What is urea for vehicles?What is the use of car urea

If it were not for diesel cars like trucks, it is estimated that many people have never heard of such things as urea for cars, and gasoline cars would not use it. The main function of vehicle urea is to convert nitrogen oxides (NOx) produced by diesel engine work into non-toxic nitrogen (N2). Reduce the NOx content in the exhaust gas to make it meet the national emission standards.

Vehicle urea, also known as diesel engine exhaust gas treatment fluid, is a consumable that must be used in the SCR treatment system. Urea for vehicles is a colorless and transparent liquid with a concentration of 31.8%-33.2%, mainly composed of 32.5% high-purity urea and 67.5% deionized water.

How does the car urea spray urine?

The car urea is matched with the SCR system (Selective Catalytic Reduction Technology). When the diesel engine discharges the combusted gas out of the combustion chamber, the controller receives the instruction, and the urea pump will draw the urea liquid from the urea tank and inject it through the nozzle The exhaust pipe is uniformly combined with the exhaust gas, and finally passes through the SCR dedicated catalytic filter, at this time, the main pollutant gas NOx and particles emitted by the diesel engine can be filtered and removed.

Why don't diesel engines use threeYuanCatalytic Converter?

The emissions of diesel engines are different from those of gasoline engines. Diesel engine emissions contain more NOx. At this time, the use of three-way catalytic converters has already failed to meet the requirements. To this end, the European R&D department has introduced SCR technology to effectively filter NOx in the exhaust gas. Gasoline engines do not need to add urea because the NOx in the exhaust gas is not as much as that of diesel engines, and the three-way catalytic device can meet the purification requirements.

Consequences of not adding urea to diesel vehicles

① During the annual inspection, if the staff isdiscoverFailure to add urea will not only fail the trial, but will also face corresponding penalties.

② Exhaust gas emission is not up to standard, polluting the environment, harming the environment of future generations, and becoming a sinner through the ages.

③ If there is no circulation of urea solution for a long time, the nozzle will be blocked, the urea pump will be damaged by dry burning, the pipeline will crystallize, etc., and finally the entire SCR system will be scrapped.

④ The ECU detects that the owner has not added urea, which will limit the torque and the car will not be able to perform well. For this reason, some car owners will brush the program to evade restrictions, and this approach will also become a sinner through the ages.

No need to add urea for National IV?

Many people find that the National IV diesel vehicles they buy do not have urea tanks, so they don’t need to add them at all. This is because the purification system used in some of the National IV diesel vehicles is different from that of the National V, which uses an EGR system.Either fake country IV, many distributorsbusinessIt will save costs, and neither EGR nor SCR systems are installed.