Analysis of Bus Exhaust Emission Using IVE Model
The IVE (International Vehicle Emission) model is used in comparison with the commonly-used MOBILE model for evaluating exhaust emission of mass transit vehicles in Shanghai. Real time bus velocity is measured with GPS system and driving pattern of bus is calculated. Simulation and predict regarding diesel and CNG (compressed natural gas) bus indicate that CNG if replaces diesel can remarkably cut the emissions of both NOx and PM; however, application of catalyst devices and EGR is still important for CNG bus to reducing pollution according to the modeling of IVE.