From 1 September 2017, the new Regulation (EU) 1151/2017 is in force, which changes the current methodology for measurement of the emissions of cars and light utility vehicles during approval. It simultaneously mandatorily expands it with measurement of pollutants in real traffic. The Emission Laboratory of TÜV SÜD Czech in Roztoky is ready for this change, and it is thus possible in Roztoky and the surroundings of Prague to come across vehicles with installed PEMS (Portable Emissions Measuring System).
What does such an installation involve?
A GPS module and a sensor for measurement of the atmospheric conditions are installed on the roof of the vehicle. The computer (so-called System Control) for collection of data from the individual measuring elements and sensors is located in the luggage compartment of the vehicle and the heart of the entire equipment is the exhaust gas analyser, which is most often installed on the vehicle’s towing gear. A component of the analyser is an exhaust gas flow rate meter, thanks to which it is possible to calculate the resulting emissions. Quality connection of the vehicle’s exhaust pipe to the measuring equipment and proper fixture of the PEMS to the vehicle’s towing gear is quite fundamental. After installation of all PEMS elements, it is necessary to set the system to standby mode and check the displayed data.
This is followed by calibration of the PEMS analysers and the so-called validation run realized on a roller test device, which can prove the correctness of the function and conformity of the precision of measured variables. Afterwards, prior to the driving test itself that is done after a minimum period of eight hours, the vehicle must stabilize at an approximate temperature of 23°C with the engine off; the conditioning space of the laboratory is used for this. Before the actual Real Driving Emissions (RDE) Test, the fixtures and functions of all of the systems are checked again. The vehicle is now ready for the emission test. The test drive is realised in normal traffic on public roads while respecting the road traffic rules. In the process, the driver may use a navigation system with a pre-set and earlier suggested (verified) driving route.