Abstract
A defined frame for the periodical vehicle inspection especially for the exhaust emissions of motor vehicles is given by the directive 96/96/EC. Because of the deterioration and bad maintenance in the time span between two periodical inspections the actual emissions of the motor vehicles may vary to the requirements. Roadside inspections as described by the directive 30/2000/EC are necessary to archive a higher standard of emission behaviar between periodical inspections, too. In the USA remote sensing systems were developped and used since the last ten years [1], [2]. The Federal Office for Testing of Motor Vehicles, Vienna, started a project in conjunction with the Instiute for Internal Combustion Engines and Automotive Engineering, Technical University of Vienna, with the aim to adapt an American remote sensing system (RSD 3000, ESP, Tucson) for the European purpose, especially for diesel engine powered vehicles, trucks and busses. Using this system the possibility is given for the measurement of the ratios CO/CO2, HC/CO2, NO/CO2 and opacity as well as speed and acceleration of vehicles passing by. Investigations on the correlation to standardized test procedures as given by directive 96/96/EC have shown, that there is a potential for the identification of high emitters. With the devellopped new on-road setup the measurement of exhaust emissions from trucks with side pipes is feasible, too. This opens the possibility for detecting high emitters on a high hit rate without annoyance the running traffic in urban and extra urban areas [3].