POWERTRAIN
power ratings that are standard for conventional vehicles. The standardised test procedure for
determining power aims to address a substantial challenge faced by manufacturers when conveying the power output of electrified vehicles to both the general public and regulatory authorities. It also provides a solution for determining system power rating for electrified vehicles for use with WLTP. The GTR21 test procedure defines
two alternatives for system power determination, Test procedure 1 (TP1) that determines vehicle system power rating via measured electrical power and ICE power, and Test procedure 2 (TP2) that determines vehicle system power rating via measured torque and speed at the axles or wheel hubs. The test is conducted by having
The GTR21 deals with many different vehicle propulsion configurations (source
unece.org)
Level of power is defined during a 10 second measurement (source
unece.org)
a fixed speed at which maximum power can be achieved and applying full accelerator pedal position for 10 seconds. The maximum power in a two second window defines the peak power and the last two seconds of the 10 second test represents the sustained power. The mean values of the second through fifth repetitions render the end results. The GTR21 defines that hub
dynamometer may be used for conducting the tests and particular for TP2 as it stipulates measurements of speed and torque at the wheel hubs, which is the core capability of a hub dynamometer. The Swedish company Rototest pioneered vehicle power testing
in the early nineties with its at the time revolutionary hub coupled dynamometer solution that would accurately measure the wheel hub output power of the vehicle. In the following three decades, Rototest has made itself a name for providing the automotive industry with advanced ViL-ready powertrain dynamometers that allow great flexibility in testing capability. Its dynamometers are used by OEMs, Tier-1s and research institutes globally, in countless applications and test scenarios. Adding GTR21 testing to the already extensive list of supported applications that today include ADAS testing, Vehicle-in-the-Loop, drive cycle etc is just another proof of the great testing flexibility their systems offer.
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