Characterization of infield vehicle activity data and exhaust emissions from diesel powered off-road vehicles.

摘要

A study was conducted to determine brake-specific emissions from diesel-powered off-highway heavy equipment that were exercised on steady-state and transient cycles. Two vehicles were evaluated in this study, a streetsweeper (114 hp) and a rubber-tired loader (110 hp). Due to the lack of appropriate transient cycles available for these vehicles, methods were developed to document infield operation for the creation of test cycles and strategies. These cycles were later used to mimic infield operation for the collection of emissions and performance data on a dynamometer test bed.; Brake-specific emissions data collected during the transient cycles was compared to data collected during the 8-mode test (CFR 40, Part 89; ISO 8178 C1) that is currently used for engine certification, and results were found to differ significantly. For the rubber-tired loader, the weighted 8-mode brake-specific HC, CO, CO2, NOx, and PM were 545%, 311%, 105%, 227%, and 177% higher than the transient cycle emissions results, respectively.