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).
Tire and aerodynamic friction and motor-driveline efficiency of electric vehicles from track tests
Reifenreibung, aerodynamische Reibung und Auswertung der verfuegbaren Batterieenergie elektrischer Fahrzeuge: Ergebnis einer Fahrpruefung
SAE-Papers ; 1-12
1978
12 Seiten, 2 Bilder, 10 Tabellen, 8 Quellen
Conference paper
English
Tire and Aerodynamic Friction and Motor-Driveline Efficiency of Electric Vehicles from Track Tests
Automotive engineering | 1978
|Tire and Aerodynamic Friction and MotorDriveline Efficiency of Electric Vehicles from Track Tests
SAE Technical Papers | 1978
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