Technical Paper
Normalizing Ambient Effects in xEV Powertrains of Varied Electrification Levels and Architectures
2022-03-29
2022-01-0664
This study demonstrates how SAE standard J1349 ambient correction factors are applied across varied powertrain electrification levels and xEV architectures. To study this phenomenon, these powertrain were evaluated (in vehicle, real road) at varied ambient pressures and temperatures to observe performance changes. 0-100kph wide open throttle acceleration time results were reported as a proxy for power/torque figures normally produced on an engine test bench in controlled laboratory conditions (per J1349). Observing results, it is clear that minimal to no ambient effects are observed on powertrains of high electrification, sometimes requiring zero normalization. The challenge to low-mid electrification/hybridization testing is understanding how to apply SAE J1349 ambient correction factors to accurately normalize results. To accomplish this, an Energy Ratio Method was developed to identify energy contributions within the powertrains.