Modelling of motor vehicle fuel consumption and emissions using a power-based model

The performance of a power based fuel consumption and exhaust emissions mod el for spark ignition vehicles has been evaluated using a large Australian database derived from testing a wide range of in-use cars on a chassis dyna mometer. It was also applied to results of on-road fuel consumption measure ment using a "floating" car which was driven back and forth on hilly roadwa ys in Sydney with a length of 8.6 km. The model is found to predict the fue l consumption well over the standard drive cycles and also for the floating car. Average exhaust emissions were also well predicted, but, as would be expected, vehicle-to-vehicle correlation is impossible due to the well-know n high variability of emissions between nominally identical vehicles.