Figures & data
FIG. 1 Flow diagram of PM sampling system from the primary dilution tunnel for laboratory tests. Solid and dotted lines show measurement from the primary and secondary dilution tunnel, respectively. Numbers within parentheses are D50 cut-off diameter of each of the instruments. The term “solid” is utilized in parenthesis for those CPCs measuring particles that are solid in accordance with the PMP definition. (a) Lab test (1999 International). (b) On-road test (2000 Caterpillar).
FIG. 2 PM mass result from laboratory and on-road testing. Note: The hatched bars represent brake specific mass emissions. Route 1 was composed of some hills and flat road conditions on California Interstate-10 Freeway. Only a single iteration was conducted over the on-road “Route 1,” so this value does not have an error bar.
FIG. 3 Particulate matter results on a filter weight basis (μg/filter).
FIG. 4 Particle Number Counts per mile for lab and on-road tests for HD trucks. Note: ' Without outliers. Route 2 is a transient driving which is composed of flat road driving with 5 stops in a 10 min stretch). For Route 1, the 3025A and 3022A concentrations were both saturated and hence the values represent absolute lower bounds. Also, the 3760 concentrations were above the maximum stated range for the instruments. *3022A sampled at CVS while other CPCs sampled under PMP dilution system. **This 3025A is a duplicate 3025A CPC for the laboratory testing. The laboratory idle test was integrated over the entire test period, and as such does not have an error bar.
FIG. 5 Coefficients of Variation. Note: * 3022A sampled from CVS while other CPCs sampled under PMP diluter. *** Negative value.’ Without outliers.
