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Atlas Copco prepared for new emission legislation EPA TIER 4A/EU STAGE III B

Monday, April 26th, 2010

As of January 2011, the emission legislations for off-road diesel engines between 130 and 560 kW will become much more severe. For the European market, emissions are regulated by EU STAGE III B. For the USA, EPA TIER 4 A is in place. An important adaptation in this next step of the legislation is a drastic reduction – with factor ten – of the allowed particles or soot in the exhaust. For NOx, which is the primary contributor to the formation of smog, the acceptance level will be brought to the half, compared with the previous legislation.
The Atlas Copco Portable Air division has evaluated the two existing technologies that can achieve these new restrictions: Selective Catalytic Reduction (SCR), and Exhaust Gas Recirculation (EGR) combined with particulate filter (DPF). The NOx Reduction System EGR/DPF of Caterpillar was chosen as the best solution.
Guy Laps, Vice President Engineering of the Atlas Copco Portable Air division explains: “With this solution we ensure that off-road customers do not need to refill with Diesel Exhaust Fluid (DEF) or AdBlue. A load factor study, done on a representative population in the field, allowed us to come, together with CAT, to the conclusion that EGR/DPF is the best technology for our portable compressor applications.”
EPA TIER 4A/EU STAGE III B was the most aggressive and expensive product development in Caterpillar history. The CAT clean emissions module minimizes impact on fuel efficiency. “First calculations show that, depending on the engine model, we will be able to have a fuel consumption decrease of up to 2%,” says Guy Laps.
Because of this big change in value of the units, there is also an impact on the costs, and therefore also on the price. The total sales prices across the effected range are likely to go up between 35 and 45 percent.
A prototype of the first Atlas Copco Portable Air compressor unit, the XRHS 366 with a new CAT C9.3 ACERT engine was shown at Bauma Germany 2010 on stand number F10/1008.
Also for the Atlas Copco Portable Air generator range the engines will be adapted in line with the emission legislations STAGE IIIA for Europe and EPA TIER 4 A for the USA.
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