Audi A1 e-tron - electric driving in the cityINGOLSTADT, Germany, Mar 2, 2010
- The new e-tron model series from Audi will gain another new member at the Geneva Motor Show: The Audi A1 e-tron is a Mega City Vehicle (MCV) with an innovative drive technology. It comes equipped with a powerful electric motor for zero-emission driving in the city. There is also an internal combustion engine on board that recharges the battery in exceptional circumstances. The A1 e-tron is very agile thanks to the 75 kW (102 hp) peak power of its electric motor.The technology of the Audi A1 e-tron
The e-tron model family from Audi is just a few months old, but it already has a number of members, for each of which Audi has chosen a different drive technology. The first e-tron, which debuted at the 2009 IAA in Frankfurt/Main, is a near-series high-performance sports car with electric motors for all four wheels. The study shown at the Detroit Motor Show in 2010 is a lightweight, compact two-seater with two electric motors on the rear axle.
The A1 e-tron now presents another approach – a compact electric car in the premium class. The four-passenger, two-door MCV city car was designed specifically for use in the metropolitan areas of Europe and North America and in the rapidly growing megacities of Asia and South America. The Audi A1 e-tron always drives on electric power; its internal combustion engine is only used to recharge the battery in isolated cases.
The integration of the new technologies shows the holistic approach that Audi is pursuing with electric mobility. The objective is to use the energy with the lowest possible losses. The precise interaction of the components, their intelligent packaging, and the efficient management of the current flows are the product of the expertise that the company has developed in this area.
Audi has developed a proprietary thermal management system to keep the battery, the electric motor, and the power electronics within their respective ideal temperature windows.
Behind the three e-tron models is a broadly diverse and modular technology platform that continues to grow very rapidly as Audi drives development forward.The electric motor: 75 kW (102 hp) peak power
The synchronous electric motor of the Audi A1 e-tron is mounted transversely at the front of the car. Its low mounting position has a positive effect on the vehicle's center of gravity. Continuous output is rated at 45 kW (61 hp), with peak power of 75 kW (102 hp) available in short bursts. 150 Nm (110.63 lb-ft) of torque is continuously available, and peak torque is 240 Nm (177.01 lb-ft).
The electric motor sends its power to the front wheels via a single-speed transmission. (posted on conceptcarz.com)
The elegant, retractable selector lever on the console of the center tunnel used to choose between 'Drive,' 'Reverse,' and 'Neutral' was taken from the first Audi e-tron.
The power electronics are mounted in the engine compartment above the electric motor. The most important components are the pulse-controlled inverter, which serves as the controller between the electric motor and the battery; the DC converter, which connects the high-voltage network with the 14 volt electrical system; a breaker unit to protect the high-voltage components; and the charging module. The socket for the standard charging plug is located behind the rings in the single-frame grille of the Audi A1 e-tron. A fully depleted battery can be recharged in approximately three hours from the 380 volt grid. A display immediately adjacent to the plug-in connection shows the current charge status and the charging time remaining.
The concept of the innovative Mega City Vehicle requires the electrification of key auxiliaries. The refrigerant compressor of the climate control system, for example, is electrically powered by a high-voltage electric motor that supplies only the amount of power needed at the time.
This increases system efficiency substantially compared to conventional concepts. Thanks to a special circuit, the climate control loop also functions as a heat pump that regulates the temperature of the cabin and the battery.
The power steering of the Audi A1 e-tron is electro-mechanical and thus particularly energy-efficient. An electronic brake system makes it possible to tap into the recuperation potential of the electric motors. A hydraulic fixed-caliper brake is mounted on the front axle, with two novel electrically-actuated floating-caliper brakes mounted on the rear axle. These floating calipers are actuated not by any mechanical or hydraulic transfer elements, but rather by wire ('brake by wire'). In addition, this eliminates frictional losses due to residual slip when the brakes are not being applied. In addition, the servo unit received a new, demand-controlled electric vacuum pump.
The large electric motor powering the A1 e-tron can convert braking energy into electric current and feed it back into the electrical system. The high degree of recuperation benefits overall efficiency. The electric control actions are imperceptible to the driver, who notices only the familiar, precise, and perfectly controllable pedal feel. The battery pack: a compact T arranged below the floor
The energy storage unit is arranged below the floor, where it is ideal for the center of gravity and weight distribution. The battery pack is shaped like a T, with the short 'transverse beam' filling the rear section of the center tunnel and the 'cross-beam' filling that area in front of the rear axle where the fuel tank is otherwise located. The 380 volt lithium-ion rechargeable battery has a nominal energy content of 12 kilowatt hours. It comprises 96 prismatic cells and weighs less than 150 kilograms (330.69 lb).
The Audi A1 e-tron can drive 50 kilometers (31.07 miles) emission-free in city traffic on the powerful battery. On longer trips, the battery is recharged by a particularly compact internal combustion engine mounted below the luggage compartment. The range extender
The A1 e-tron concept car has a Wankel engine as a range extender, but other compact concepts are also possible. The small single-rotor Wankel has a chamber volume of 254 cc and runs at a constant 5,000 rpm in its peak efficiency window. The electronics also consider navigation data such as the destination and route profile to automatically activate the range extender as needed. The driver can also turn the range extender on and off as necessary with the push of a button The fuel tank holds 12 liters (3.17 ÚS gallons).
The great strengths of the Wankel engine are the nearly vibration-free and quiet operation, the small dimensions, and the extremely low weight. Together with the generator, which is powered by the Wankel engine and produces 15 kW of electric power, the complete assembly weighs only around 70 kilograms (154.32 lb). This weight also includes the special power electronics, the intake, exhaust, and cooling unit, plus the insulation and the subframe. Driving experience
The first defining impression that the driver of the Audi A1 e-tron gets is that of nearly total silence. Even the Wankel engine in the back can barely be heard when it is running.
The second characteristic perception is the power of the electric motor, nearly all of which is available instantly and thrusts the Audi A1 e-tron forward with authority. The innovative Mega City Vehicle, which despite its complex drive technology weighs only 1,190 kilograms (2,623.50 lb) delivers zero-emission driving fun in a modern and sophisticated manner. The vehicle accelerates from 0 to 100 km/h (62.14 mph) in 10.2 seconds and has a top speed of more than 130 km/h (80.78 mph).
The Audi A1 e-tron can also cover longer distances if the range extender charges the battery. The extra range, which is intended primarily for interurban driving, is 200 kilometers (124.27 miles).
According to the draft standard, the two different operating modes yield a fuel consumption of only 1.9 l/100 km (123.80 ÚS mpg), which corresponds to CO2 emissions of 45 g/km (72.42 g/mile). In electric mode, there are zero local CO2 emissions - the compact A1 e-tron is thus ecological and economical.
The third impression that the A1 e-tron makes is that of a larger car. The compact two-door boasts all of the strengths of the new A1 model series – the carefully tuned, sporty chassis with specially designed 18 inch alloy wheels and 215/35 R18 tires; the generous, 'grown-up' interior; the excellent fit and finish; and a multitude of high-end equipment.
The dark shade 'ebony' dominates the interior. The seats – with stone gray seams – and the headliner are in 'Alabaster White'.Design
The concept car in Geneva has a special 'Aqua Mint, pearl effect' paint finish; the contrasting roof arch is offset in 'High Gloss Steel dark.' As with the other two e-tron models, the 18-inch wheels with a 20-spoke turbine design convey the high-tech aspiration of the concept.
The rear diffuser with aluminum trim lacks tailpipes. This emphasizes the width of the vehicle and suggests the low emissions. The two front fenders are emblazoned with the 'e-tron' logo.
The 'Aqua Mint, pearl effect' exterior color carries over into the interior, where it adorns the door panels and the center console. The shift lever is a special leather-wrapped design; as is typical for the e-tron models, the start-stop button was placed in the front of the center console. A specially designed battery cover at the front of the car and the range extender engine with its cooling fins displayed under a sheet of glass in the luggage compartment also serve to visually underscore the clean technology of the A1 e-tron. And because an innovative drive concept also calls for innovative information management, the concept car features a freely programmable instrument cluster with a virtual display surface and innovative display and operating concept.Source - Audi
Audi A1 e-tron wins Silvretta Electric Car Rally
- Audi repeats its 2010 victory in the 2011 Electric Car Rally
- 'The A1 e-tron succeeds even in the Alps,' says Franciscus van Meel, Head of Electromobility Strategy at AÚDI AG
- Audi believes in electrification without fear of limited range
Audi is this year's overall winner of the second Silvretta Electric Car Rally in Austria's Montafon region. The 2011 victory of the A1 e-tron follows the R8 e-tron's win last year. The second Audi in the rally, a Q5 HFC with a fuel cell finished in sixth place. A total of 32 electric vehicles were evaluated.
After three days, 307 kilometers and a total altitude difference of 11,541 meters, the A1 e-tron bearing the number 206 was named the winner of the second Silvretta Electric Car Rally Montafon. The event took place from July 7-9 as part of the 14th Silvretta Classic. The name Silvretta refers to a group of mountains in the eastern Alps of Austria. The Audi A1 e-tron won against 31 competitors in a rally, that was held on highly taxing mountain roads with inclines up to 15 percent, presenting a special challenge to electric vehicles. The Audi Q5 HFC, which was also entered by Audi, achieved sixth place. This was the best final result of all cars with a fuel cell.
The A1 e-tron contains technology that Audi's development engineers are using to study the mobility requirements for such a future-oriented concept. The technological basis includes an electric motor with a maximum output of 75 kW that is powered by a lithium-ion battery. The battery features a 12 kWh capacity and can be completely charged in 30 minutes (quick charge), or in less than three hours (standard charge). It offers a range of 50 kilometers. To prevent drivers from being stranded by an empty battery, the A1 e-tron also comes equipped with a combustion engine, which can charge the battery as needed. The one-disc rotary engine (254 cc) is located under the trunk floor; it provides 15 kW of output intended solely to charge the battery, rather than to directly power the wheels.
The A1 e-tron is designed with a local emission-free electric drive system, which is ideally suited for driving in a city.
During the rally the A1 e-tron was driven by Franciscus van Meel, Head of Electromobility Strategy at AÚDI AG. Long-time Audi employee Gerhard Gruber took on the important role of co-driver. 'Sending an electric car into the Alps is one of the toughest challenges you can present it with. The fact that the A1 e-tron proved so impressive here is especially gratifying to me and it proves we're on the right track with our electric mobility approach of combining an electric motor with a combustion engine . Many thanks to our dedicated team for making our second overall victory in a row possible,' said van Meel after crossing the finish line.
Van Meel then went on to describe the rally itself: 'On the first day we drove cautiously and despite a distance of just over 100 kilometers we finished with a lot of electricity left in the battery. On the second day we were better prepared and we were able to win the day; on day three we came in second, and in the end that was enough to win the overall victory. The car ran flawlessly. We're now looking forward to the 2012 rally. We already have a few ideas about the kind of concepts we'll enter with, of course.'
InfoSource - Audi