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Comparative analysis of NEDC and WLTC homologation tests for vehicle tests on a chassis dynamometer

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In 2015, the number of vehicles in the world exceeded 1.1 billion units. In the coming years, it is expected that the largest increase in the number of vehicles will take place in developing countries. This is a problem in particular in terms of emissions of harmful substances from vehicles. Considering that all manufactured vehicle models have to undergo a detailed homologation and meet the exhaust emission requirements before placing on the market, it is necessary to refine test procedures, including test cycles, in which vehicle emissions are determined. At present, the NEDC approval test is valid in Europe. It is a cycle reproduced on a chassis dynamometer in steady conditions. It consists of an urban section repeated four times and an extra urban part. From 2019, a new test procedure will take effect, which uses the WLTC cycle, also reproduced on a chassis dynamometer in fixed conditions. It is much more complex and better reflects the real traffic conditions. For a better illustration of the differences that occur between the current NEDC cycle and the new WLTC, the article presents a comparative analysis of both driving cycles. This is to present the justifiability of using a new driving cycle and to present its complexity. The article presents own research of a vehicle with a spark-ignition engine, which has been tested both in the NEDC and WLTC cycle. On the basis of the obtained data, it was possible to determine the differences in the emission of harmful exhaust gas components and indicate how the new homologation procedure affects the emissions from the vehicle.
  • Motor Transport Institute Jagiellonska Street 80, 03-301 Warsaw, Poland tel.: +48 22 4385400, fax: +48 22 4385401
  • Warsaw University of Technology Faculty of Automotive and Construction Machinery Engineering Narbutta Street 84, 02-524 Warsaw, Poland tel.: +48 22 2348517, fax: +48 22 8490303
  • Motor Transport Institute Jagiellonska Street 80, 03-301 Warsaw, Poland tel.: +48 22 4385400, fax: +48 22 4385401
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Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).
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