As part of emissions calculation work for Germany, Austria and Switzerland, ten diesel light-duty trucks (LDT) and ten diesel passenger cars (PC) were measured on the chassis dynamometer at EMPA. All vehicles were tested with the NEDC, the FTP-75 and with 7000 seconds of real-world driving. The PCs were loaded to 100 kg as per the type-approval test procedures. A load equivalent to 30% of maximum was used for the LDTs. Bag- and time-resolved measurements were performed on the testbed for CO, T.HC, NOx, CO2 and O2. Particle matter was measured gravimetrically. The emission levels of the light-duty trucks are significantly higher than the corresponding levels for the passenger cars because the LDTs operate at higher engine loads than the usually well-powered PCs. For most vehicles, T.HC and CO are well below the limits, while NOx and PMass vary across a wide range, exceeding the limits in many cases. The time-resolved measurements were applied to the "BEFU methodology", an instantaneous emission model, to calculate emissions of cycles not measured on the dynamometer. The verifications of the results showed no bias and no dependence on the measured cycles. (A)
Abstract