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BREATHE EASY
Page 58
Page 59
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With operators still gearing up for Euro-4, egislators are already ooking forward to Euro-6 and beyond.
Alan Bunting reports. European legislators in Brussels are looking at HGV driving techniques with a view to cutting emissions of carbon dioxide.
Dr Reinhard Schulte-Braucks, head of the European Commission's Automotive Industry Unit in Brussels.explained the EC's philosophy at a heavy-duty diesel emissions control symposium in Gothenburg organised by the US Society of Automotive Engineers He predicted that for the Euro-6 emissions limits (expected to be introduced in about 2013), the attention of European legislators will switch From air quality to greenhouse gas emissions and CO, in particular. One way of controlling CO., generation and fuel consumption might be by modifying the shift patterns in automated transmissions, Lars-Goran Moberg, chief executive at
Volvo Powertrain, told the symposium that further cuts in air-quality emission levels would force up fuel consumption and vehicle prices. Schulte-Braucks replied that Brussels is studying the cost benefits of further reductions in oxides of nitrogen (N Ox) and particulate matter (PM). adding that some control of the number of particles in the PM2 size range, as well as the total PM mass. was back on the Euro-6 agenda.
Tampering concerns Schulte-Braucks told Commercial Motor tha this was prompted by the appearance of`ope PM filters (like the Erni= metal-mesh unit fitted by MAN). which trap far fewer of the smaller particles than porous ceramic filters.
Brussels also has concerns that operators might tamper with SCR systems, but Schulte. Braucks was confident that by 2008 accurate and durable tailpipe NOx sensors would he available to verify the proper functioning of both SCR and EGR installations Breaches of the Euro-5 NOx limit would be recorded as a fault code in a vehicle's on-hoard diagnostics system,where the fault data would be held for at least 400 days.
Simon Edwards from the Ricardo research group said cutting NOx and PM emissions below Euro-5 limits were likely to need a combination of SCR and EGR as well as a PM filter.And he warned that a high EGR rate combined with the back-pressure effects of a ceramic filter would almost certainly wipe out
the acknowledged fuel consumption benelits A Dr Reinhard Schulte of SCR. • Braucks el the EC