The function and working principle of the urea solenoid valve, what are the symptoms of a broken urea pump solenoid valve?

Urea solenoid valve Function

Solenoid valveThe main function is to change the forward and backward suction of urea. Forward suction, as everyone knows, the pressure is built up through the diaphragm pump and the urea solution is sprayed through the urea nozzle. If the vehicle stalls, urea solution will remain in the pipeline. As we all know, urea solution will crystallize below minus 11 degrees Celsius. The back-suction and emptying design is to solve this problem. When parking, the system will automatically suck back to empty the urea solution in the pipeline, and the urea solution in the pipeline will suck back into the urea tank. Because the urea tank has a water heating system, the urea can be heated in winter. After the urea solution is heated, the entire system can work normally.

In order to solve the problem of low-temperature urea crystallization in the urea pump, there are two heaters on the filter element and in the lead frame to heat the urea pump at low temperatures to prevent low-temperature urea crystallization.

The urea nozzle is installed at the front end of the muffler, and urea with pressure is injected into the exhaust gas through it. There is a solenoid valve on the urea nozzle. The solenoid valve will adjust the pulse according to the ECU signal to adjust the injection frequency.

Working principle of urea solenoid valve

The principle of the solenoid valve is that, controlled by the solenoid valve, the ambient temperature is lowered by computer instructionsSolenoid valve opens and coolant passes through The urea tank circulates and heats the urea tank.

What are the symptoms of a broken urea pump solenoid valve

1. There is a strong smell of oil in the car.

2. The engine idle speed is high and low and accelerates Powerless.

3. The engine stalls or is difficult to start.

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