Abstract
Mass emission of gas components from vehicles are generally obtained by Constant Volume Sampling (CVS) method, though this method measures the averaged mass emission over test cycle. Information of instantaneous mass emission is useful for engine control. A flow rate measurement using CO2 as a tracer can be a method to calculate the instantaneous mass emission. In this study, two wet base CO2 analyzers using heated NDIR have been applied for this CO2 tracer method. In the comparison with CVS-SAO method, the wet base CO2 analyzers showed better results for exhaust flow rate measurement than dry base CO2 analyzers.
