Iveco HI-SCR system: the most efficient Euro VI technology

Regeneration? No thanks.

This is the theme of Iveco’s European media campaign to communicate the efficiency of its HI-SCR technology for the post-treatment of exhaust gases. Iveco’s solution without exhaust gas recirculation (EGR) offers many advantages such as reduced fuel consumption and extended diesel particulate filter (DPF) life and safety.

HI-SCR is an Iveco exclusive technology, the only emission control system which does not alter the combustion process, because it works through fresh and clean air intake rather than exhaust gas recirculation (EGR). This means that the combustion temperature is higher and the percentage of particulate is so low that an active DPF is not needed.

The new Eurocargo is the only vehicle to adopt this innovative technology in the medium truck sector. All Eurocargo vehicles powered by Iveco Tector 5 and Tector 7 Euro VI engines do not have any exhaust gas recirculation. The combustion process is, in fact, optimised according to highest energy efficiency.
As well as having positive effects on fuel consumption, this clean combustion minimizes the formation of particulates while nitrogen oxides (NOx) are reduced by the innovative selective catalytic reduction (SCR) of the post-treatment system which achieves a NOx conversion efficiency of about 97% (Hi-SCR).

The advantages of this technology are numerous, first of all the driver safety: no action is required by the driver as there is no need to make periodic stops for DPF forced regeneration – thus providing significant benefits in terms of total cost of ownership.

The DPF is a filter that captures particulate; when the filter is fully clogged, it needs to be regenerated, by elevating the exhaust temperature and injecting fuel to burn off combustion residues and carbon deposits. The over-heating of the DPF during active regeneration may create a condition of potential danger for people and objects in the immediate environment, when they get too close to the device.

The HI-SCR of the new Eurocargo, instead, requires only passive DPF regeneration, that continuously cleans itself at lower temperatures, without additional energy and during normal operation.

Customer benefits also include greater efficiency and lower fuel consumption thanks to optimised combustion without EGR and the extraordinary conversion ratio of about 97% of the SCR system. There is no need for injecting additional fuel to burn the particulates. In this way both fuel consumption and thermal stress of the post-treatment system are reduced.

A single compact system instead of two also means fewer components, less complexity and less weight for a considerable gain in payload. The elimination of the EGR system results in better performance with smaller displacement engines compared to the competition.

The entire system HI-SCR is optimally positioned on the chassis to allow maximum bodybuilding flexibility, making the new Eurocargo ideal for most body types, including box vans and curtainsiders, refrigerated bodies, tanker bodies and many other configurations.
These advantages are applicable across the entire Iveco Eurocargo, Stralis and Trakker ranges.
 

The components of the proprietary HI-SCR system

The exhaust gas post-treatment system of the Iveco Cursor and Tector Euro VI engines consists of an oxidation catalyst (DOC) and a diesel particulate filter (DPF) with no active regeneration. Downstream of the DPF are, in sequence, the urea metering device, the high turbulence mixing pipe and the SCR catalyst. A final catalyst (CUC, Clean-up Catalyst) eliminates any residual ammonia content in the exhaust gases. To implement this technological innovation, Iveco has exploited the unique experience of CNH Industrial, sector leader with 500,000 on-road and off-road SCR systems, marketed by its brands since 1996.