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In-service emissions measurements were conducted on two package delivery trucks: one model year 2008 FCCC MT-55 conventional diesel and one model year 2012 FCCC MT-55 hydraulic hybrid (HHV). Mass emissions of CO2, CO, NOx, PM, and THC from the HHV and the conventional diesel test vehicle were each measured under conditions closely simulating normal package delivery operation. The HHV demonstrated a 29.4% improvement in fuel economy and a 17.4% reduction in CO2 emissions compared to the conventional diesel vehicle. The HHV showed its best potential in operating areas characterized by low driving speeds and high number of stops (“pick-up and delivery”) with a 40.5% improvement in fuel economy and a 21.2% reduction in CO2 emissions.

Emissions of particulate matter (PM) and oxides of nitrogen (NOx) from heavy-duty engines used in road vehicles and mobile equipment are of critical concern to air quality planners. Accurate measurement of these emissions is needed both for emission inventory purposes and for the development and validation of emission control measures. These emissions cannot adequately be predicted from laboratory tests on new engines. This paper reports the development of the Ride-Along Vehicle Emission Measurement (RAVEM) system. Based on the constant volume sampling (CVS) principle, the RAVEM system can accurately and repeatably measure mass emissions of NOx, CO2, and PM from an engine exhaust pipe while “riding along” on the vehicle or equipment under test. In most cases, this can be done without removing the vehicle from service. RAVEM test results have been shown to correlate very closely with those of conventional CVS emission laboratories.