Denoxtronic 8 by Bosch – Next Step in Evolution for Commercial Vehicles and Off-Road

The diesel engine plays an essential role offering competitive total cost of ownership and in reducing CO₂ for manufacturers (OEM) of commercial vehicles and off-road applications - and it will continue to do so in the next years in the context of increasing diversity in the powertrain mix striving for carbon neutrality in the near decades to come.

Requirements regarding NO_x emissions have been and will remain a major driver for further development of this technology and complying with these requirements will induce further actions on the engine and the exhaust system. SCR-based exhaust-gas treatment (EGT) is the method of choice to support OEMs in achieving future emission requirements.

For Bosch, a double injection SCR with closed-loop control based on adequate EGT sensors represents an efficient, robust and targeted method to achieve this goal. As a major part of the SCR system the urea dosing system needs to provide adequate and precise dosing rates to ensure the efficiency of the NOx conversion. Taking On Board Diagnostics requirements into account, not only low dosing tolerances are important, but also an accurate monitoring of potential deviations. In this paper, the key drivers for a new dosing system “Denoxtronic 8” are presented. In the course of developing this optimized system, Bosch profited from years of EGT domain experience and succeeded in implementing newly designed Big Data Analysis methods helping to master the rising numbers of requirements.