Drive Quality Assessment of Stock vehicles for EcoCAR Benchmarking

Paper #:
  • 2017-01-5015

  • 2017-10-13
Reinsel, S. and Nelson, D., "Drive Quality Assessment of Stock vehicles for EcoCAR Benchmarking," SAE Technical Paper 2017-01-5015, 2017.
The purpose of this research is to refine the shifting behavior and drivability of a post transmission (P3) plug-in parallel hybrid electric vehicle (PHEV) being developed by the Hybrid Electric Vehicle Team (HEVT) for the EcoCAR3 competition. The vehicle’s powertrain has been modified with an electric motor placed on the driveshaft after the conventional 8 speed automatic transmission. This motor can be leveraged to smooth out the jerk experienced by the driver during part-load transmission shifts, as well as other drivability metrics such as gearshifts and cruise control. These metrics also include powered take off, tip in, and tip out events. Additionally, improving the drivability of active fuel management (AFM or cylinder deactivation) mode by assisting the engine will be examined to attempt to improve drivability. In order to analyze the drivability of the vehicle, similar competitive vehicles are benchmarked for drivability including a stock Camaro and stock Silverado, the donor vehicles for the PHEV. This benchmarking is performed using the benchmarking software provided by Anstalt für Verbrennungskraftmaschinen List (AVL), which allows comparison to a standard scoring system. These benchmarking measurements are taken on the stock vehicles with intent of improving upon the scores using the PHEV P3 motor torque actuation. The objective of the research is an operational strategy for augmenting transmission shift performance, AFM transitions, and drivability with the electric motor unique to this powertrain. This operational strategy will be developed based on the data presented in this study.
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