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SUMMARY Emissions from three modern HDV vehicles were investigated on a chassis-dynamometer. One of the vehicles uses PM-Kat and is certified according to EURO4. The second one is EURO5 compliant and uses SCR. The third one is was a EURO3 HDV, which was tested with and without VERT-certified DPF. The investigation focussed on solid particles in the mobility size range of 10-400nm. The instruments were SMPS, NanoMet, PASS and ELPI. Sampling conformed to PMP for SMPS and NanoMet, PASS and ELPI were used with FPS-dilution. Metallic emissions were measured using ICP-MS. Also measured were inherent secondary emissions, especially NO 2 and NH 3. For the majority of operating points for EURO4 with PM- Kat and EURO5 with SCR, a moderate curtailment of nanoparticle emissions was observed compared to EURO3 without DPF. However, at full load the EURO5 engine emitted higher concentrations than a EURO3 engine without DPF. A stochastic particle release was observed from the PM-Kat of the EURO4 engine. Its penetration scatter was very much dependant on the soot burden and the testing history. Compared to a EURO3 engine with a DPF conforming to VERT criteria, both modern engines EURO4 and EURO5 emitted 100- 500 times more nanoparticles. The gaseous emissions of the EURO5 engine exhibited very good results. There were no deleterious effects observed due to the SCR. The concentrations of NH 3 and N 2O remained close to the detection limit. However, the EURO4 engine emitted rather high concentrations of NO 2 at about half load range. Emissions of Vanadium with EURO5 and Platinum with EURO4 were low in both cases, even below detection limit.

Nanoparticle-Emission of EURO 4 and EURO 5 HDV Compared to EURO 3 With and Without DPF