POWER TRAIN
The JRC’s experimental set-up for the roller-type versus hub-dynamometer comparison Source:
https://doi.org/10.3390/en15072402
also apply to zero CO2 emission vehicles (electric or fuel cell vehicles). For light-duty vehicles (cars and
vans) the Euro 7 is built upon the current Euro 6 but with broadened driving and environmental boundary conditions, to ensure emissions stay low in a broader range of conditions experienced by vehicles across EU. The proposal also aims to simplify the rules with less complexity and removal of testing procedures no longer needed. Stricter emissions requirements and
broader application means emissions control systems have to be optimized for almost any driving style or traffic situation. This in turn puts greater pressure on the development, and with only three years until implementation improvements cannot wait. Rototest, a manufacturer of test
Rototest’s hub-type dynamometer can be used interchangeably to
traditional roller-type dynamometers achieving greater flexibility.
systems for complete vehicle and powertrains has been working in the vehicle development field for more than three decades with focus on cost-effective and efficient solutions for OEMs and Tier1s. The
current legislation, Euro 6 includes several laboratory procedures where the vehicle is driven according to a specified driving cycle and exhaust emissions are measured. Although the Euro 7 focuses more on expanding the on-road testing for type approval, laboratory testing will be a substantial part and increasingly so for the manufacturers development work in order to achieve required limits. The rules of Euro 6 states that
the dynamometer type used in laboratory tests shall be of roller- type (possibly by tradition as roller dynamometers have been around for more than a hundred years). Rototest, being a manufacturer of alternative hub-dynamometer technology, with present focus on high-dynamic and Vehicle-in-the-Loop applications, has a technology that is applicable also to emission testing. Together with the European Commission Joint Research Centre, JRC, Rototest has conducted an equivalence study between roller-type and hub-type dynamometers. The study, published as two white
papers, concludes that hub-type dynamometer with the appropriate technical capabilities can be used interchangeably with an emission grade roller-type dynamometer and provided the same results. Rototest’s dynamometer capable
Real-time CO2 emissions (cold-start WLTC) with the roller-type and hub-type dynamometers. Source:
https://doi.org/10.3390/en15072402
of both handling high-dynamic manoeuvres, steering and advanced simulation environments as well as be used for legislative testing, just as Euro 7, aims to greatly simplify the selection of test system for today’s and tomorrow’s vehicles.
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