SOURCE: CNH Industrial
Iveco Trucks, Buses and Coaches equipped with HI-SCR technology per Euro VI homologation are an effective answer to concerns related to exothermic regeneration typical of EGR systems when used in particular working conditions
Iveco, with its unique HI-SCR technology, addresses the increasing concern among companies operating in hazardous environments about the risks deriving from the high temperatures of active regeneration implied by EGR Systems.
Iveco’s HI-SCR system is an SCR (Selective Catalytic Reduction) Only technology that meets Euro VI step A standards without EGR (Exhaust Gas Recirculation) or active regeneration. It allows for safe and normal operation in hazardous environments such as refineries, chemical plants, airports, tunnels, bus hubs, pedestrian areas and other locations where excessive heat can be a risk factor – as is the case with Euro III/IV/V models. Iveco’s Medium and Heavy Duty Range, Stralis, Trakker and Eurocargo, as well as Iveco Bus Urbanway, Crealis, Crossway and Magelys ranges, Euro VI step A feature this technology, offering a safe solution for companies operating in these types of environment and concerned about the risks of high temperatures of active regeneration.
EGR systems, when used as anti-emission devices, cause a higher soot concentration inside the Diesel Particulate Filter (DPF) and periodically require an exothermic reaction to clean the DPF filter. This process is controlled by the engine management system and can normally occur at any time, leading to exhaust gas temperatures that may reach or exceed 600° C. Some vehicle manufacturers have added an indicator and/or an inhibition switch on the dashboard to warn drivers and allow them to stop the exothermic process. This technical solution relies on the ability of the driver to understand when the process has to be stopped or avoided.
In contrast, HI-SCR is a patented technology that does not require such an exothermic reaction and thus it eliminates the need for any inhibitor switches on the dashboard or any driver intervention. In fact, exhaust gas temperatures for IVECO Euro VI HI-SCR vehicles do not exceed those of previous Euro IV / V generations.
As a result, Iveco Euro VI step A homologation on Heavy and Medium range commercial vehicle and bus models has been granted without the requirement of an additional test to demonstrate compliance with this active exothermic regeneration process (595/2009/CE WHTC hot start with regeneration test), otherwise required by European emissions regulations.
The added advantages of HI-SCR
The Tector and Cursor HI-SCR engines offer a number of advantages. A key benefit is enhanced safety: there is no high heat generation with this technology, avoiding the need to rely on the ability of the driver to understand when to activate the inhibitor switch that stops active regeneration. This makes it a safe solution in locations where excessive heat can be a risk factor, such as refineries, chemical plants, airports or tunnels.
As no action is required by the driver and there is no need to make periodic stops for DPF forced regeneration, this provides significant benefits also in terms of maintenance intervals and associated costs.
Additional customer benefits also include greater efficiency and lower fuel consumption thanks to optimised combustion without the use of EGR and the extraordinary NOx conversion ratio up to 97% of the SCR system. A single compact system instead of two also means fewer components, less complexity and less weight for a considerable gain in payload. Fuel consumption can achieve savings of up to 4.5% versus Euro V.
The use of a single NOx treatment system downstream of the engine and elimination of the EGR system results in better performance with smaller displacement engines compared to the competition.
Turin, 18 March 2016