Steady State Speeds Load Determinations Using Electric Vehicle Power or Dynamometer Measurements on Conventional Vehicles

Paper #:
  • 2017-01-0990

Published:
  • 2017-03-28
Abstract:
ABSTRACT Track Road Load Derivations (RLDs) and subsequent load matching on test cell dynamometers has traditionally been conducted using vehicle coastdowns (CDs). A vehicle’s speed changes during these coastdowns are used to calculate the drag forces that slow vehicles when on the road. Drag forces exerted on a vehicle, can also be quantified by holding a vehicle at a specific steady state speed and measuring the forces required to maintain that speed. Track coastdowns require the vehicle to be placed in neutral to accomplish. Hybrid Electric Vehicles (HEVs) do not necessarily have true neutral mechanical power transmission modes and some vehicles exhibit large variations from CD run to CD run. This paper focuses on two steady state speed methods to quantify parasitic forces which a vehicle must work against when motoring.
Also in:
  • SAE International Journal of Engines - V126-3EJ
  • SAE International Journal of Engines - V126-3
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