Diesel particulate filter and SCR(AdBlue/DEF) systems removal


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Selective Catalytic Reductior (SCR) is a catalyst-assisted method of chemically converting nitrogen oxides (NOx) into Nitrogen (N2) and water (H2O). This is made possible by a reductant, the role of which is played by urea. Ammonia in its pure form is a dangerous substance, and for this reason a 32.5% aqueous urea solution is used for road transport where the use of urea is regulated.

The purpose of the SCR system is to reduce exhaust particulate matter (PM) emissions and reduce the amount of nitrogen oxides in the exhaust gas.

In the SRC system, we can distinguish the following components:

  • urea solution tank (NOx/AdBlue)

  • heater (prevents the fluid from freezing during cold periods)

  • pump

  • injector

  • NOx controller (located at the end part of the SCR system)

The ammonia-based SCR system is used in diesel engines for passenger cars, but also construction machinery, ships or many power industry solutions.

When the controller (ECU) detects a malfunction of the SCR system, it reduces engine operation. In trucks, torque is reduced (thus reducing emissions). The situation is different in case of construction and agricultural machinery, where they become completely immobilized if the SCR system fails. The most faulty parts of the SCR system are the pump and the NOx controller. To avoid repair or further problems, an SCR/AdBlue system emulator is used.

Uklad kontroli emisji zanieczyszczen z silnikow wysokopreznych

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