Emissions from a Diesel Vehicle Operated on Alternative Fuels in Copenhagen 1999-01-3603

A new diesel van with a reference weight of 1661 kg and a pre-chamber engine with a displacement of 2400cc was tested on a chassis dynamometer. The fuel consumption and emissions of carbon monoxide, unburned hydrocarbons, nitrogen oxides, carbon dioxide, particulate matter and associated organic material (SOF) as well as PAH (Polycyclic Aromatic Hydrocarbons) were measured under different driving conditions. The driving patterns used were recorded with a chase car at real traffic conditions on several roads in Copenhagen. The emissions were measured using different kind of diesel fuels as well as RME and biodiesel. CO, CO2, HC, and NOx levels generally decreased with increasing average speed of the driving cycle for all fuels tested. Cold start emissions were generally higher than for warm start. Biodiesel fuel gave generally higher particulate emissions and the highest levels of particulate-associate soluble organic fraction (SOF) for all driving cycles; cold start emissions were again higher than for warm start. The biofuels seemed to give the lowest PAH emissions.