Moreover, if the chemical composition of low-quality urea solution is not high, and there are heavy metals and other chemical components, it will react with the catalyst, reducing the conversion effect of tail gas, or even losing its function; Therefore, when choosing urea solution, we should try to choose high-quality products to control the maintenance cost of vehicles. The standard concentration of urea solution for general vehicles is between 3 1.8%-33.2%.
Matters needing attention in the use of urea solution
The ratio of urea solution is very accurate, not a simple mixture of "urea granules+water". Urea solution is easy to crystallize because of its high urea content and low water content. Dilution of urea solution can not achieve the reduction effect, and the tail gas emission is unqualified; If the solution contains mineral impurities, it is easy to block the urea pump and nozzle in the precision aftertreatment system.
There is an indicator on the dashboard of the vehicle using DEF to remind the driver of the remaining amount of DEF in time. When the remaining amount of DEF is too low, the warning light will light up. If the DEF is consumed during driving, the power of the vehicle will be reduced, and the power will return to normal after the DEF is supplemented.