How does the Urea Solution react in vehicle system?

After the vehicle is started, the urea system does not start to work immediately.

The urea system will only start running if several conditions are met:

①The engine is running normally;

②The temperature in the urea tank is greater than -4℃, and the urea tank will be heated if not satisfied;

③No Post-processing related faults; after the conditions are met, the urea system can normally enter the next stage - the pressure building stage.

The so-called pressure building stage is simply to let the solution in the urea system pipeline circulate under pressure.

This stage has two functions:

①Urea solution for vehicle is circulated and ready for injection;

②The nozzle is cooled. After the pressure is successfully built and the pressure is stable, the urea system enters the next working stage - the injection stage.

In the injection stage, the system will calculate the injection amount and injection timing according to the exhaust temperature of the engine, exhaust gas flow, nitrogen oxide content, etc., and command the nozzle to inject.

The injection of urea solution for vehicles needs to meet the following conditions:

①The pressure in the urea pipeline for vehicles must meet the requirements;

②The temperature of the exhaust gas reaches 200 degrees Celsius;

③The urea injection system is trouble-free;

④The nitrogen and oxygen content of the exhaust gas exceeds a certain value;

After Urea solution is injected, the urea (CO(NH2)2) will be decomposed and converted into ammonia gas (NH3) at high temperature. The nitrogen oxides in the diesel vehicle exhaust react with the ammonia gas to generate nitrogen and water. The chemical reaction is: 2CO (NH2) 2+4NH3+O2=2CO2+4N2+4H2O. At this stage, the mission of urea solution for vehicles is completed.

However, it should be noted that when the vehicle is stopped, do not turn it off immediately, and give the vehicle urea solution in the pipeline time to return to the urea tank, and the urea solution in the pipeline must be easy to crystallize and freeze.

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