Firstly, the concentration of vehicle urea solution is one of the key factors affecting SCR system. The concentration of urea is directly related to the catalytic efficiency of nitrogen oxides and the freezing point of urea solution, and also affects the parameter setting of post-treatment system. The concentration of high-quality vehicle urea solution must be within the specified range, which is difficult to achieve for inferior products.
Secondly, the quality of vehicle urea also has adverse effects on spray attachment and catalyst of SCR system. There are water insoluble impurities in unqualified vehicle urea, which block the filter, urea solution pipeline and nozzle. The coke deposition after combustion of impurities will affect the spray attachment of the postprocessing system and block the catalyst skeleton, resulting in the reduction of catalyst efficiency and service life.
In addition, if the urea concentration is not up to the standard, the emission will exceed the standard, which is reflected in the reduction of engine torque immediately and the lack of vehicle power; in cold conditions, the metering pump will be directly frozen.
The use of unqualified vehicle urea only has a great impact on the use of vehicles, but if you do not add vehicle urea, it is a bad thing to harm future generations. A lot of people think that saving a little is a little. It seems to save a little money if we don't add car urea. In fact, we have picked up sesame seeds and lost watermelon. Now let the hydraulic power source small make up for you to thoroughly analyze the harm of not adding vehicle urea!
At present, many vehicle owners cheat the OBD monitoring to make the vehicle run out of power for the urea in the SCR system, which seems to reduce a lot of trouble. However, due to the full combustion of the national five engine in order to reduce PM emissions, the NOx emissions in the exhaust will not be reduced, but will also increase, and the exhaust pollution will even exceed that of the national three vehicles.
At the same time, the SCR system does not work for a long time, which will cause the residual urea solution in the SCR system to crystallize and block the pipes and nozzles. Because of the lack of liquid immersion for a long time, the service life of all parts of the SCR system will be reduced or even damaged, and the catalyst will lose its catalytic effect. The cost of replacing parts of the SCR system is far higher than that of normal use of vehicle urea, which will increase the cost of vehicle owners.
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