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Audi introducing electric 1+1 urban concept at Frankfurt with support for wireless charging; more detail on electric A2 concept

Urbanconcept
Audi urban concept with support for wireless charging. Click to enlarge.

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.

Audi Wireless Charging. Audi Wireless Charging (AWC) refers to contactless induction charging. The infrastructure side, comprising a coil and an inverter (AC/AC converter), is placed on the normal parking spot of the Audi urban concept and connected to the power grid. The 3.6 kW primary coil set into the plate generates a high-frequency alternating field.

The charging process begins automatically when the urban concept drives onto the plate. The alternating magnetic field of the infrastructure side induces an alternating current across the air gap in the secondary coil, which is integrated into the vehicle. This current is rectified and fed into the vehicle’s electrical system, where it charges the battery or powers consumers such as the heater. The alternating field is only generated if the vehicle is standing over the plate and thus poses no danger to people or animals.

Charging stops automatically when the battery is fully charged. The driver can interrupt charging at any time. The efficiency of AWC is comparable to that of other charging technologies. It is not affected by rain, snow or ice. The new technology makes charging electric vehicles easy and extremely convenient. A later version of the technology will be able to be integrated into the transportation infrastructure as a retrofit for parking garages or residential streets, for example.

A2
The A2 concept. Click to enlarge.

The A2 electric concept. Audi’s A2 electric concept (earlier post) is also designed for Audi Wireless Charging.

The lithium-ion battery mounted in the sandwich floor stores 31 kWh of energy, 24 kWh of which are usable. The electric motor is transversely mounted in the front of the vehicle. It delivers 85 kW (116 hp) of peak power (60 kW continuous) and 270 N·m (199 lb-ft) of torque (160 N·m (118 lb-ft continuous) to the front wheels via a single-speed transmission.

The Audi technology study has a range of 200 km (124 miles) in the European driving cycle. It takes roughly 1.5 hours to fully recharge the battery with 400 volt three-phase current and approximately four hours with 230 volt household current.

The show car weighs less than 1,150 kilograms (2,535 lbs). This is due primarily to its body, which features the most advanced state of Audi’s ultra-lightweight construction. The A2 concept marks the first time that the ASF has been combined with hybrid multi-material construction, in which very different materials are combined with one another. In this case, the superstructure is made largely of aluminum components and is complemented by add-on parts of carbon fiber-reinforced polymer (CFRP).

The Audi A2 concept accelerates from 0 to 100 km/h (62.14 mph) in 9.3 seconds; top speed is limited to 150 km/h (93 mph) in the interest of range. A McPherson strut front suspension and a torsion beam axle in the back provide for agile handling. The steering and brake systems are purely electric (steer-by-wire and brake-by-wire), requiring no mechanical or hydraulic connection to the steering wheel or the pedals, respectively.

The 18-inch wheels are fabricated using cladding technology. The alloy base wheel and the cladding are manufactured separately and bonded together, reducing the amount of material used. The new hybrid technology, which Audi already uses in some production models, saves roughly two kilograms (4.41 lb) per wheel. The wheels of the A2 concept combine the blade look of the e-tron family with Audi’s classic spoke design.

Comments

Reel$$

Audi appears to be throwing around a few ideas to see if any stick. The lightweight concept electric 1+1 could use a more rounded aero look and we get no spec on AER. But it shows Audi is thinking light weight electric for urban transport and that is GOOD!

We'd like to see Audi/VW brands both delivering EV/PHEVs by 2014. About then the materials costs should be reduced enough to let these EVs compete with ICEs. And in Europe with $8-10 gas - that takes a lot less effort than in the low cost gas US at $4.00/gal.

AUDI - build these cars!

Account Deleted

I liked everything about that A2 until its 1.5 hour “quick charge” was specified. The Leaf can do that in only 30 minutes. Audi needs to do better than a Nissan Leaf or it will not be an Audi. There is a new 90kW international charging standard in circulation right now for approval. Try and do a concept that can use that preliminary standard to charge 100 miles of driving in 15 minutes. That would be really exciting as it will solve the range anxiety problem with EVs while not making them prohibitively expensive for most consumers that cannot afford a larger battery than about 24 kW/h for 100 miles of driving.

90kW charging
http://www.greencarcongress.com/2011/08/sae-20110811.html

HarveyD

Interesting possibilities. Electrified vehicles charging speed and e-range will be solved by 2020 or shortly thereafter. Much lighter (than today's) vehicles will also be well on their ways. All that new technology will cost more for the first few years but not too far in the future, ultra light small urban e-vehicles, will be affordable. Affordable highway larger e-vehicles will not be far behind. E-vehicles have a great future.

Account Deleted

To have an energy management is one useful way to patronized the used of green energy. I know that to used green energy, many will have to consider its advantage and in fact that would be a save from electricity.
Atlanta Gutterglove Leaf Blaster

HealthyBreeze

@ Harvey,

I've got to say it again. We all want the cheap, durable, compact, light-weight, long-range, quickly-recharged battery problem to be solved. We've all seen hundreds of purported innovations in the past decade that were supposed to get us there. Saying, "Just add 9 years and the problem will be solved" gives most of us little comfort.

Treehugger

Audi said it loud and clear "EVs are cars for idiots" and as they think so, they design EVs as they take their desires for reality...

Arnold

Geez Henrik,
It took me one and half hours just to catch and saddle the pony.
You may not have noticed just how contagious the slow movement is?
From Wiki * 1 Slow Food 2 Slow Gardening 3 Slow Money 4 Cittaslow (cityslow?) 5 Slow Parenting 6 Slow Travel 7 Slow Art 8 Slow Media 9 Slow Fashion 10 Slow Software Development 11 Slow Goods 12 See also.

Aside that the time is related to single phase or close coupled charging, there are many other reasons as to why a slow charge would not be life threatening.

Personally, the home solar setup is going to take till next week's shopping day anyway so no rush there.
If I lived further from town necessitating a recharge, I would be parked for several hours anyway.

Smart grids and opportunistic charging strategies are unlikely to be the fastest kid on the block for quite some time to come anyway - at least 2020 so.
No particular hurry there.

I'm already rushing around so fast that I am looking at the back of my head (which isn't any prettier than the front.)

And they told me that Europeans were 'serfisticaterd'
I'm beginning to have some doubts there now.

If this Audi is anything to go by, they can't be all that bad!

Darius

Concepts, concepts, concepts.....and nothing real. That is Audi approach.

Most interesting is wireless charging item. How things are going with standard adoption?

Engineer-Poet

Henrik, if the Japanese scheme for wiring the road works, range of the vehicle on the battery ceases to be much of an issue as long as you're on the network.

Pierre

Unfortunately, it is rumored that it is killed by Audi, fearing low market acceptance and high cost.

And GCC missed this.

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