POWERTRAIN POWERING UP
James Hayes discusses the recent GTR21 regulation relating to power rating for electrified vehicles
D
etermination of Electrified Vehicle Power is the title of the Global Technical Regulation 21, or UNECE
GTR21 for short. The GTR21 is a regulatory framework established under the UNECE WP.29, also known as the World Forum for Harmonisation of Vehicle Regulations, which is a working party within the United Nations Economic Commission for Europe (UNECE). WP.29 is responsible for developing and
maintaining international vehicle regulations and standards to ensure the safety, environmental performance, and quality of vehicles and their components. The aim of the GTR21 is to define
a test procedure and system power rating that provide a reliable and repeatable way to command a vehicle to deliver maximum power in a laboratory setting and to give a comparable and valid basis for system power rating and as well as describe
the measurements and calculations necessary to produce it. Electrified vehicles and conventional
vehicles are projected to coexist in the market for the foreseeable future. Many established regulations and procedures, such as WLTP, apply to both vehicle types and require a power rating as a critical metric. To ensure equitable treatment, it’s essential that the power rating for electrified vehicles is both qualitatively and quantitatively on par with the traditional engine-based
GTR21 is only one of the many applications supported by Rototest’s flexible powertrain dynamometers
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