News / Motoring
Tuesday, February 02, 2010
Audi E-Tron Electric Car
Image: © 2010 NAIAS

Audi Gives A Sports GT 4 Electric Motors

DETROIT, MICHIGAN - At last month's North American International Auto Show in Detroit, Audi AG presented their e-tron electric concept car to international journalists. The Audi e-tron is a fully electric four-wheel drive sports GT and has two electric drive motors on the front axle and two on the rear axle. Total maximum power output from the Audi e-tron's electric motors is 230 kW (313 hp), giving it a 0 to 100 km/h time (0 to 62.14 mph) of 4.8 seconds.

The Audi e-tron uses a lithium-ion battery pack for storage power with a total storage capacity of 42.4 kWh. The car can go 248 kms (155 miles) off of a full charge, with the 470 kilograms (1036.17 lbs) battery pack mounted over the rear axle.

All driving lights on the e-tron, including the headlights, are high efficiency LED type, a version of which are found on Audi's current 2010 production models. Audi engineers have also designed the headlights to have adaptive automatic assistance, giving them auto-adjustable illumination depending upon weather conditions.

Audi says that their e-tron electric car has been designed as a supercar, and that the same quattro four-wheel drive sports GT performance is now delivered to this electric vehicle. Audi has designed two separate cooling systems - one assigned to the front axle motors and one for the rear motors to moderate the heat build-up from the high power electric motors. The top speed of the Audi e-tron is electronically limited to 200 km/h (124.27 mph).

Charging Audi's e-tron electric car can be performed off a household 230V outlet and this takes between six to eight hours. When the e-tron is charged off a high voltage charger (400V / 63 amps), the charge time is reduced to about 2.5 hours.

For what is probably a first in a high performance sports GT car, Audi engineers have installed an electric motor at each wheel, with 70 percent of the power delivered to the rear wheels and 30 percent to the front wheels. Because each wheel has its own electric motor, power can be uniquely delivered through to the road using an intelligent drive system. Audi says that the e-tron's power delivered to each wheel can be adjusted in milliseconds to correct for oversteer or understeer, and that the system is also integrated with four-wheel stability brake application. The Audi e-tron has 19 inch rims with low profile tires with dimensions 235/35 on the front and 295/30 on the rear.

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