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

Maciej Gis , Mateusz Bednarski , Piotr Wiśniowski


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
Author Maciej Gis
Maciej Gis,,
, Mateusz Bednarski (FACME / IAE)
Mateusz Bednarski,,
- Institute of Automotive Engineering
, Piotr Wiśniowski
Piotr Wiśniowski,,
Journal seriesJournal of KONES, ISSN 1231-4005, e-ISSN 2354-0133, (B 14 pkt)
Issue year2018
Publication size in sheets0.5
Keywords in English combustion engines, homologation procedure , NEDC test, WLTC test, exhaust emissions
Languageen angielski
Score (nominal)14
Score sourcejournalList
ScoreMinisterial score = 14.0, 09-01-2020, ArticleFromJournal
Publication indicators GS Citations = 1.0
Citation count*1 (2020-01-10)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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