Evaluation of Exhaust Emissions in Real Driving Emissions Tests in Different Test Route Configurations

摘要

The article presents an analysis of exhaust emissions in vehicles with gasoline engines according to the most recent research procedures in RDE tests. The compliance of test parameters (on chosen test routes) was evaluated against the requirements of the standard and dynamic parameters were determined characterizing the trips (among others - the product of speed and positive acceleration). Time ranges of respective trips were analyzed in coordinates -vehicle's speed vs acceleration; based on that a matrix was developed that allows for comparing trips not only based on averaged parameters (e.g. average speed, stoppage time, etc.) but also all conditions of the vehicle's operation during the road test. The comparison of those parameters for tests carried out along various test routes and the identification of discrepancies provided grounds for the next step of the evaluation in which exhaust emissions in respective test phases (urban, rural and motorway parts) were compared. The result is a methodology for determining exhaust emissions in road tests of various route configurations in which the exhaust emissions intensity matrix for the vehicle and basic trip parameters, e.g. speed profile, are known.