Abstract
A study on the correlation of opacity and PM mass of exhaust gas from a diesel vehicle has been performed in this work. The real-time measurement of PM mass from a diesel vehicle has been considered to be important for the development of a diesel vehicle, especially after-treatment systems. Three inline full-flow opacimeters and a partial-flow type diesel opacimeter were used to get the real-time data of diesel smoke. The real-time opacity, pressure, and temperature of diesel exhaust gas were measured during the experiment of New European Driving Cycle using a diesel passenger car. This real-time data of diesel smoke was correlated with the total PM mass measured by a diesel dilution tunnel system. The exhaust gas mass flow rate from CVS system was used to convert the opacity to PM mass. The effect of measurement location and opacimeter type has been investigated and the variation of correction factors connecting the opacity to PM mass has been discussed to find a way to apply the method to actual PM emission development. In addition, we could get the real-time performance of the DPF system in a diesel passenger car by the measurement of the opacity in front and at the rear of the DPF system simultaneously.
Keywords: Diesel, opacity, PM, correlation, DPF