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Volvo warns that emissions cuts will force up fuel costs
Page 16
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The level of emissions controls we can expect at Euro-6 have been
discussed at a conference in Sweden. Alan Bunting reports.
A LEADING TRUCK manufacturer has warned Brussels against introducing ever-more stringent emissions regulations because this would force up the cost of new vehicles and hit fuel consumption.
Speaking at a heavy-duty diesel emissions control conference in Gothenburg, Sweden, organised by the US Society of Automotive Engineers,Volvo Powertrain CEO Lars-Goran Moberg said further cuts in air quality emission levels would be inordinately costly in terms of fuel consumption as well as vehicle price.
However,Dr Reinhard SchulteBraucks, head of the European Commission's Automotive Industry Unit, said that for Euro-6 the EC was still evaluating the cost benefits of further reductions in NOx and particulate emissions.
He warned delegates that some control of the number of particles in the PM2.5 size range, as well as the total PM mass, was back on the Euro-6 agenda.
This was prompted by the appearance of "open" PM filters (such as the Emitec metal-mesh unit fitted by MAN) which trap far fewer smaller particles than porous ceramic filters.
Schulte-Braucks added that Brussels was still concerned about operators tampering with SCR systems in order to save money, but was confident that accurate and durable NOx sensors would he available by 2008.
Euro-6 will also lead legislators to switch their attention from air quality to greenhouse gas emissions, particularly CO,.
Simon Edwards, from the Ricardo research group, told the conference that reducing NOx and PM below Euro-5 limits was likely to need a combination of SCR and EGR, as well as a PM filter.
Edwards added that a high EGR rate added to the back-pressure effects of a ceramic filter would almost certainly wipe out the acknowledged fuel consumption benefits of SCR.
• Euro-4 certified versions of Daf's cruiserweight' 9.2-litre engine will retain the company's unique but now familiar UPEC unit-pump fuel system.
Its vital pump and separate injector componentry will conie from Delphi instead of Bosch, Des Euro-3 supplier.
The system hardware will he to Delphi's E3 specification, following the example of Daf's all-new, 12.9-litre MX engine.