Denoxtronic
The Denoxtronic reduction-agent metering system from Bosch is mainly employed in heavy commercial vehicles. In connection with an SCR catalytic converter (Selective Catalytic Reduction) it contributes to reducing nitrous oxide emissions (NOX) by up to 85 percent. At the same time, the engine can be so designed that it consumes up to five percent less fuel by comparison with other EU4 applications.
With the help of this system, the limits laid down for heavy commercial vehicles in the EU5 pollution standards, valid from 2008 onwards, can already be complied with today. The cleaning process is triggered by AdBlue, a non-toxic reduction agent made up of water and urea, which is fed into the exhaust-gas flow with great precision. This produces ammonia, which reacts with the nitrous oxides in the SCR catalytic converter to form harmless nitrogen and water. The Denoxtronic takes over the exact metering of the AdBlue, which is stored in a separate tank on the vehicle.
The dosing control unit, which is networked with the engine electronics, adjusts the addition of AdBlue precisely to important engine parameters such as operating temperature and engine speed, so that the correct amount is always injected. In the first generation of the system, which went into series production in 2004, this was done with the help of compressed air. The second Denoxtronic generation came onto the market in 2006, doses the AdBlue without compressed-air support. It consists of fewer components and is even simpler to integrate into the vehicle.
