An experimental approach has been applied to define driving cycles characterising driving behaviour in urban traffic. Driving cycles are to be used for the evaluation of exhaust emissions from individual vehicles in traffic. Designed trips have been performed by an instrumented car in a highly congested urban area of Naples, vehicle and engine operating conditions have been recorded. The velocity profile of the car is analysed in terms of kinematic sequences described by the car between two successive stops. Series of successive sequences having homogeneous characteristics have been used to define, by cluster analysis, experimental driving cycles respresentative of different traffic conditions. Results of analyses are summarised in this paper, as well as diagrams of statistically sampled driving cycles. (A)
Abstract