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Tire and Aerodynamic Friction and MotorDriveline Efficiency of Electric Vehicles from Track Tests
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Abstract
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).
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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.Also In
References
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