Assessment of the Efficiency Measurement Uncertainty and the Impact on Validation for Electric Drive Systems

This paper investigates the uncertainties concerning the measurements in efficiency testing of an Electric Drive System (EDS), consisting of e-motor, inverter and transmission sub-systems. The paper will present a case study on how to consider uncertainties in the measurement chain, demonstrate a technical workflow for testing of the EDS and benchmark the results of testing with different previously executed measurements and results from simulations. With this study, a correlation between testing and simulation is explored through graphs with confidence bounds and gaps between virtual testing and testing in real-life are identified. Finally, a critical consideration will be given to how the uncertainties in measurement should be considered in the assessment of requirement coverage and validation