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RDE REFERENCE CYCLES F O C U S 1 7 Emissions compliance for passenger cars and light-duty vehicles under real-world driving conditions, required by the EURO 6c standards for type approval and in-service conformity testing, will be phased in gradually from September 2017 and is posing a major challenge to OEMs. The vehicle has to be optimized to ensure emissions compliance not only over the entire operating range, but also for a host of different driving and traffic situations. Testing will additionally take into account various climatic conditions and the impact of different driver types – from the anticipatory to the decidedly sporty driver. Given these extended requirements, the conventional development methodology, which is primarily based on completing predefined and therefore known test cycles, is reaching its limits and needs to be adapted to face up to the RDE challenge. THE PIONEERING ROLE OF COMMERCIAL VEHICLES AVL’s competitive edge, when it comes to RDE development, stems from its extensive experience in the field of commercial vehicles. “When demonstrating emissions compliance in real-world driving, trucks have had a pioneering role for example due to the heavy-duty EURO VI emission standards that have been in place for some time,” says Johannes F. Kregar, Application Manager, Engine Test Systems. “For examplethe type approval tests for trucks on the engine testbed already address a much wider range of VIRTUAL DEVELOPMENT VIRTUAL INTEGRATION the engine map than, for example, the NEDC cycles do for passenger cars. Apart from that, in the course of a complementary steadystate test, the WNTE (world-harmonized not-to-exceed) limits are already being assessed in the testing lab under extreme ambient temperature and atmospheric pressure conditions (up to an altitude of 1700 m).” Also, the periodic testing of emissions compliance over the entire market service life has already been required for the inservice conformity testing of commercial vehicles since the EURO VI was introduced. All of these measurements and tests have been successfully carried out by AVL for customers in the HD vehicle sector for quite some time. R DE R EFERENCE C YC L ES REPRODUCTION AND ANALYSIS SYSTEM INTEGRATION AND VALIDATION BRINGING THE ROAD TO THE RIG A fundamental focus in RDE development for passenger cars is on shifting the on-road testing environment to the different test systems in order to raise the tests’ efficiency and reproducibility. Before bringing what is referred to as a “RDE lap” from the road to the testbed, it is first necessary to record the data in the vehicle during the realworld test drive. This is done with M.O.V.E iS, AVL’s mobile emission measuring system, which is capable of measuring gaseous emission components (NO/NO2 and CO/CO2) as well as particle numbers. “Owing to their high quality, measurements performed with the M.O.V.E iS system exhibit excellent comparability > RDE development: the use-cases “Reproduction and Analysis”, “RDE-Reference cycles” and “Virtual Integration” are playing the key roles.


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