Tire and Aerodynamic Friction and MotorDriveline Efficiency of Electric Vehicles from Track Tests 780218
Tests of seventeen electric vehicles were analyzed to estimate tire friction, aerodynamic drag-area product, and average motor-driveline efficiency. The tests included coastdown runs, range over the SAE J227a driving schedules (B, C, and constant speed), and constant-current battery discharges. Analysis indicates that winds during coastdown tests resulted in average standard deviations of seven percent for tire friction, and fifteen percent for drag-area product. Motor-driveline efficiency estimates ranged from 40 percent to 93 percent (fifteen vehicles, J227a/B schedule), and from 61 percent to 93 percent (eleven vehicles, J227a/C schedule).
Citation: Brennand, J., "Tire and Aerodynamic Friction and MotorDriveline Efficiency of Electric Vehicles from Track Tests," SAE Technical Paper 780218, 1978, https://doi.org/10.4271/780218. Download Citation
Author(s):
John Brennand
Pages: 12
Event:
1978 Automotive Engineering Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1978 Transactions-V87-A
Related Topics:
Tire friction
Electric vehicles
Tires
Batteries
Aerodynamics
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