Particulate Emission Characteristics From Idi Diesel Engine Under Transient Operation

The importance of diesel engine as a power source for light duty vehicle become increased rapidly, because of its potential for lower fuel consumption. But there are two big problems, noise and particulate emission remained unsolved in this type of engine. As for the particulate emissions, there has been few practical methods to measure the instantaneous emission rate during transient operation, which is inevitable for the analysis and reduction of the particulate emission in transient test cycle as LA#4. A new method is developed for this purpose based on the continuous measurement of the pressure drop of the sampling filter in the dilution tunnel method. Its accuracy and time resolution have been checked. In the IDI diesel engine, the particulate emission is changed by design parameters and operation parameters such as injection timing, EGR rate and injection rate, which must be calibrated to get best compromise between fuel consumption and emissions. In this study, the new method has been applied to estimate the effects of control strategy of these parameters on transient particulate emission characteristics and some of the findings are reported in this paper.