EMISSIONS LEVEL APPROXIMATION AT COLD START FOR DIESEL VEHICLES

This paper presents a study regarding the emissions produced at the engine could start. Also, the paper presents a brief survey of current extra emissions estimation methods. The main goal of this work is to describe the relative cold start extra emissions as a function of exhaust gas temperature. Experimental research has been done for several light vehicles. There were been made six tests, in different temperature conditions. For measurements was used the GA- 21 portable analyzer. The parameters measured are CO, NO, NO2 , NOx , and SO2 . In order to accomplish a mathematical approximation of CO, NO, NO2 and SO2 in function of exhaust gas temperature, logarithmic approximations, and polynomial regressions were used. The curves resulted from the mathematical model can be used to approximate the level of CO, NO, NO2 and SO2 , for similar vehicles.