Dynamic Measurements of Particulate Mass Emission on Light-Duty Diesel Engines under Steady State and Transient Conditions

Real-time measurements of the particulate emission of a light duty Diesel engine mounted on a dynamic test bed are reported. These measurements were performed using a novel device for the simultaneous dynamic determination of graphitic (“black”) smoke and hydrocarbon mass loading in the undiluted exhaust with a time resolution of 0.1 sec. For a given speed and load significant differences between the emissions under steady state and transient conditions were observed. The typical features of these deviations were different for the graphitic particulates and the hydrocarbons.