UDDS

AcronymDefinition
UDDSUser Defined Data Stream
UDDSUrban Dynamometer Driving Schedule (US EPA vehicle test)
UDDSUnit Dose Dispensing System (medications)
UDDSUser Defined Data Sets
UDDSUlysses Dust Detection System (US NASA)
References in classic literature ?
Says the poet Mr Udd, "Being seated, to run through the region of the spiritual world; I have had this advantage in books.
Overall, the results reported here for the Cummins ISX-15 vehicle did not show strong differences in carbon balance fuel economy between the test fuels for either the UDDS or the HHDDT cycles.
For the Cummins ISB6.7 vehicle for the UDDS cycle, fuel economy showed the most significant fuel effects, with the HVO fuels and the biodiesel blend resulting in reductions compared to CARB ULSD.
PM mass was collected cumulatively for the entire triplicate UDDS and HHDDT cycles for all vehicle/fuel combinations due to the expected low PM levels.
For the solid particle number emissions for the Cummins ISX-15 vehicle for the UDDS cycle, all biofuel blends showed statistically significant reductions compared to CARB ULSD.
For both the UDDS and HHDDT cycles for the Cummins ISB6.7 vehicle, the biofuel blends showed strong reductions in volatile particle number emissions compared to CARB ULSD, with these differences being statistically significant in most cases.
Figure 12 and Figure 13 illustrate the particle size distribution profiles for the Cummins ISX-15 vehicle over the UDDS and HHDDT cycles, respectively.
Figure 14 and Figure 15 present the average particle size distributions for the Cummins ISB6.7 vehicle over the UDDS and HHDDT cycles, respectively.
Testing was performed over the Heavy-Duty Urban Dynamometer Driving Schedule (UDDS) and Heavy Heavy-Duty Diesel Truck (HHDDT) Transient Cycle.
For the Cummins ISX-15 vehicle for the UDDS cycle, N[O.sub.x] emissions showed statistically significant and marginally statistically significant increases for the HVO blends and the biodiesel blend compared to CARB ULSD.
For the Cummins ISX-15 vehicle, fuel economy did not show strong differences between the test fuels for either the UDDS or the HHDDT cycles.
PM mass emissions for the Cummins ISB6.7 vehicle were much lower than those for the Cummins ISX-15 vehicle, and showed some increases in PM mass with the HVO fuels and the WCO20 blend compared to CARB ULSD for the UDDS, while for the HHDDT cycle all biofuels resulted in lower PM mass emissions.