Modelling real time emissions from an instrumented car

There are several ways of using a full chassis dynamometer to determine emissions from a vehicle. One method is to use a dynamometer to simulate a predefined drive cycle. The method described in this paper uses the dynamometer to derive an engine map of a vehicle. The engine map is a three-dimensional graph with manifold pressure(x-axis) and engine speed (y-axis) in the two dimensional plane, with emissions levels on the z-axis. These maps are then applied to on-road vehicle data to derive emissions models for the vehicle. The models can then be used to quantify vehicle emissions for any given speed-time profile. (a) For the covering entry of this conference, please see ITRD abstract no. E212640.