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Sunday, September 11, 2011

Audi introduce Electric 1+1 urban concept @ Frankfurt [video]

Audi is introducing a 1+1 urban concept technology study for urban and metropolitan areas. The electric-powered show car has four wheels, combines elements of a racecar, a roadster, a fun car and a city car, and weighs just 480 kilograms (1,058.22 lb). The cabin of the Audi urban concept offers slightly offset seating for two; the roof slides back for entry, and the canopy can remain open in good weather.

Audi says the technology study is targeted toward people who are interested in technology and are enthusiastic about new approaches to mobility, independent of their age and status. In particular, it addresses an urban public whose lifestyle both reflects the car’s modern concept and the driving pleasure associated with it and is a good fit for a possible innovative leasing system.

The outer skin of the show car is made of carbon fiber-reinforced polymer (CFRP); the occupant cell is a mix of CFRP monocoque and an aluminum structure. This ultra-lightweight construction is the foundation for the technology study’s low curb weight of 480 kg.

Wishbones made from a combination of aluminum and CFRP locate the free-standing, 21-inch wheels.

Manufactured using cladding technology, the 21-inch wheels are very light and feature a variant of the blade design from the Audi e-tron models. The tire sizes are as unusual as the car as a whole – 125/60 up front and 145/50 in the rear.

The Audi urban concept uses pushrod technology borrowed from motorsports. As in a racecar, the struts mounted in the interior of the monocoque are nearly horizontal. Four disc brakes provide the stopping power. The turning circle measures less than nine meters (29.53 ft)—ideal for a city car. Thanks to the vehicle’s low weight, the rack-and-pinion steering does not require any power assistance. Crumple zones in the front and rear plus two airbags provide for a high degree of passive safety. An innovative assistance system helps the driver to avoid collisions with pedestrians.

The battery is mounted transversely behind the seats. The lithium-ion battery, which weighs around 90 kilograms (198.42 lb), stores 7.1 kWh of usable energy. The study’s two electric motors together produce 15 kW (20 hp) of continuous power and 47 N·m (34.67 lb-ft) of torque. The motors are mounted between the rear wheels, which they drive via a single-speed transmission.

The Audi urban concept accelerates from 0 to 100 km/h (62.14 mph) in 16.9 seconds. It reaches 60 km/h (37 mph) in around six seconds. Top speed is governed at 100 km/h (62 mph). Range in the European driving cycle is 73 km (45 miles). The battery recharges completely in about 20 minutes with 400 volt three-phase current, and in approximately one hour with 230 volt household current.

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