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Cleaner truck technology
Page 14
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KI Last week Daf unveiled engine technologies which are part of its plans to meet the Euro-4 and Euro-5 emissions standards which are due in 2005 and 2008 respectively.
Peter de Kok, Dais chief engineer for engine development, says that for Euro-11 the Dutch engine maker is looking at reducing NOx emissions via exhaust gas re-circulation (EGR), adding a soot filter to tackle particulates. However, he admits that further development is needed on both systems if they are to function perfectly.
For soot filters to operate effectively, he adds, "sulphur-free diesel is a must". According to de Kok, cooling the exhaust gas within an EGR system can put up to 40kW into the engine's cooling system; there are also issues with engine fouling and oil contamination.
for Euro-5, Daf (like MAN) is working on a DeN0x catalytic converter using liquid urea as a reduction agent to convert NOx into nitrogen and water, cutting NOx levels by up to 10%. However, a DeN0x system requires a separate urea tank on the vehicle and a refilling infrastructure.
Daf says that adding systems such as EGR, soot filters and DeN0x systems will inevitably force up chassis prices as well as operating costs.