1. Development background and necessary utilization of permanent magnetic motor design onto chassis dynamometer
The fundamental goal is to proactively respond to the rapidly changing market environment, where vehicles are transitioning to eco-friendly electric vehicles and internal combustion engines are rapidly electrified.
The supplier of such high-power chassis dynamometers is currently not existing domestically or globally, except TeSys, based on 48” MIM configuration. Maximum Hill Climbing Ability was held to prove the excellence of controllability and its precision level.
Demonstration of extremely precise controllability to test the maximum gradient test (a.k.a maximum hill climbing ability): No matter how much instant maximum power generated and transferred to the dyno system (Road load simulation with speed control; measuring maximum vehicle force at wide-open throttle while maintaining a constant speed of 1.50 kph with a deviation of +/- 0.02 kph)
*Remarkably reached at top notch up to 20,000N tractive force, measured on chassis dynamometer from TeSys while retaining a constant speed of 1.5 kph at all times.
2. Major global vehicle testing regulations
As the motor of electric vehicles is based on the high-efficiency PM MOTOR (Permanent Magnet Motor), the dynamometer used to test such vehicles should also be equipped with a PM(Permanent Magnet) motor instead of the current AC motor.
It must comply with the 'US EPA Dynamometer Roller Size Regulation' and 'US SAE Electric Vehicle Test Regulations', plus WLTP & NEDC.
3. Technical background – Establishment of global testing regulations for electric vehicle’s power output
(Europe UN) EV (xEVs) testing requires vehicle power measurement:
Relevant regulations “UN GTR No. 21” *GTR: Global Testing Regulation; Determination for vehicle output DEVP (Determination of Electrified Vehicle Power)
WLTP vehicle class is categorized by PMR (Power-to-Mass) and Vmax.
In cases where necessary, vehicle output is also used to determine the downscaling factor. Currently, all xEVs are classified as Class 3 ← Due to the absence of regulations for calculating vehicle output
For HEVs and Pure Electric Vehicles, a New Regulation for Determining Vehicle’s power output has been established
Existing ICE Vehicles ← UN Regulation No. 85 – Engine performance certification regulations: The PMR is calculated based on the certified and approved engine output obtained through engine (target) certification tests
HEV & Electric Vehicles ← ISO 20762, UN GTR No. 21: In the chassis dynamometer, while the vehicle speed is fixed then the measurement of power output accessed by performing rapid WOT (wide-open-throttle)
→ Chassis dynamometer need to be capable of absorbing power output from electric vehicle
*UN Regulation No. 83 – Vehicle certification (WLTP) procedures
*UN GTR No. 15 – WLTP testing procedures regulations
*UN GTR No. 21 – Regulations: determination for vehicle output DEVP
