Cummins Develops Dual-Dosing System For The New Scania V8

Cummins' UL4 Dual-Dosing system

New emissions control technology looks ahead to ultra-low NOx capability

• Cummins has successfully completed the integration of an innovative Dual-Dosing urea injection system for the new Scania V8 range.
• The new Dual-Dosing system for the upgraded Euro VI Scania V8 is supplied from the Cummins Emission Solutions (CES) facility located at Marktheidenfeld, Germany.
• The next generation Cummins system is the first to introduce Dual-Dosing architecture to the truck industry, bringing a future-proof solution capable of meeting the next level of ultra-low NOx levels.

Cummins has successfully completed the integration of an innovative Dual-Dosing urea injection system for the new Scania V8 range, contributing to enhanced emissions control and improved fuel-efficiency for the most powerful truck engine on the road with an unsurpassed 770 hp (566 kW) output. The new Dual-Dosing system for the upgraded Euro VI Scania V8 is supplied from the Cummins Emission Solutions (CES) facility located at Marktheidenfeld, Germany.

The next generation Cummins system is the first to introduce Dual-Dosing architecture to the truck industry, bringing a future-proof solution capable of meeting the next level of ultra-low Nitrogen Oxides (NOx) levels proposed beyond current Euro VI emission levels and EPA regulations in North America, as well as helping to meet CO2 reduction goals.

The Dual-Dosing system applies two streams of urea, known as AdBlue or Diesel Exhaust Fluid, into the exhaust stream of a Selective Catalytic Reduction (SCR) system to convert emissions into vapour. The system is able to increase the effectiveness of NOx conversion during the low levels of heat at engine start-up and low-load running, with an additional benefit of enabling the engine combustion formula to reduce fuel consumption.

“I am excited that Scania and Cummins are pioneering this technology in the truck space. Cummins is a long term supplier of high precision urea dosing systems to Scania, and we were able to leverage our long-standing partnership to introduce this innovative Dual-Dosing solution for their upgraded V8 product,” said Robert Cochanski Rodriguez, General Manager – Cummins Emission Solutions in Europe, Middle East and Africa.

“It has taken thousands of hours of research and development, but I am delighted to say that the new system meets very demanding cold start conditions and operates robustly against harsh vibrations, achieving this while maintaining peak performance across a wider temperature range than previous systems”, added Cochanski Rodriguez.

Now commercially available, the new Dual-Dosing system has a modular design adaptable to a wide range of engine displacements and SCR aftertreatment configurations. With both Dosers acting as a single, fully synchronized system, this ensures the amount of urea injected (AdBlue or Diesel Exhaust Fluid) is equivalent to that of today’s Single-Dosing systems. The system is ideally designed for both low-flow and high-flow SCR systems, with the capability of meeting dosing rates up to 16 kg/hr.

Meeting the emissions challenge

The new Cummins Dual-Dosing urea injection system brings a new approach to resolve the NOx emissions control challenge resulting from low temperatures within the aftertreatment exhaust flow. During cold cycle operations, the SCR-DPF aftertreatment becomes far less effective in reducing emissions as the reduced heat level adversely impacts the catalytic chemistry. This typically occurs under cold start conditions, low driving speeds, engine idling and with low ambient temperatures, representing a significant obstacle to meet extremely low emissions levels.

The Dual-Dosing design virtually eliminates any emissions spikes during cold cycle conditions by close-coupling the first Doser at the turbocharger outlet. This utilizes higher temperatures present as the exhaust stream exits the engine and enables the injected urea stream to maximize the emissions reduction. The second Doser is located at the aftertreatment unit and operates when additional NOx reduction is required.

Extensive testing of the Dual-Dosing system has demonstrated the ability to reduce NOx emission levels to around 50 percent below that of today’s regulations, providing a future-proof solution ready to meet the more stringent emission reductions likely to be proposed by the EU and EPA.

Lowering fuel consumption

The Dual-Dosing system also brings a further benefit by enabling the engine combustion formula to reduce fuel consumption, as the need to generate excessive engine heat for the urea stream blending is eliminated. Depending on engine architecture and driving factors, this could improve fuel-efficiency by 2 to 3 percent. This saving will play a significant contribution in helping trucks to reduce their carbon footprint and more easily meet the upcoming Greenhouse Gas (GHG) regulations.

“The success of the Dual-Dosing project for Scania shows the dedication of Cummins to support our customers by developing future proof solutions. We are committed to helping the truck and bus industry to meet tomorrow’s emissions standards today with innovative, flexible and integrated component technology for all our markets.” commented Cochanski Rodriguez.