Experimental comparison of hub- and roller-type chassis dynamometers for vehicle exhaust emissions

The emissions of vehicles are measured in laboratories with roller-type chassis dynamometers, which simulate the road driving resistances. Hub-coupled dynamometers, which are not included in the regulations for emission measurements, are commonly used for research and development purposes, for example to assess powertrain capabilities, simulate on-road trips, and calibrate indi-vidual wheels’ control. As they do not need particular infrastructure, and offer a wider range of applications, they could be a more economical alternative, especially if they could also be used for emission measurements for type approval of vehicles. Nevertheless, the two types have not been directly compared in the literature and thus their equivalency especially for emission measure-ments is not known. In this study the emissions of a Diesel and a gasoline plug-in vehicle were compared using the same analytical equipment and switching only the roller and hub dynamometers. The Diesel vehicle was further tested at second roller-type dynamometer with the same and a second driver. The results of the two dynamometer types were very close, even though the repeatability of the measurements was very narrow. The main message of this work is that the hub-type dynamometers can be used interchangeably with the roller-type dynamometers. Points that need to be addressed, such as determination of dynamic wheel radius and tire slip level are also discussed.

GIECHASKIEL Barouch;  FORLONI Fabrizio;  OTURA GARCIA Marcos;  ENGSTRÖM Christian;  ÖBERG Per; 

2022-03-31

MDPI

JRC128668

1996-1073 (online),   

https://www.mdpi.com/1996-1073/15/7/2402,    https://publications.jrc.ec.europa.eu/repository/handle/JRC128668,   

10.3390/en15072402 (online),