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New e-tron quattro drive possible in Audi plug-in hybrid crossover concept

Audi’s new allroad shooting brake crossover concept, which combines elements of its allroad and e-tron hybrid models, has debuted at the 2014 North American International Auto Show in Detroit.
Powered by a plug-in hybrid drive that the carmaker says makes a new form of quattro drive possible – e-tron quattro – the show car delivers 408ps of system power and system torque of 650Nm, while being able to accelerate from 0-100km/h in 4.6 seconds and reach an electronically limited top speed of 250km/h. Fuel consumption is measured at 1.9 liters/100km (149mpg), which equates to CO2 emissions of 45g/km, and a total driving range of up to 820km is achievable.
"The show car combines highly efficient e-tron-quattro technology that produces 300kW of power yet only consumes 1.9 liters/100 km of fuel and cutting-edge electronic applications," says Dr Ulrich Hackenberg, member of the board of Audi AG, technical development. "We are offering very concrete glimpses of the near future in this show car."
Alone, the transverse mounted 2.0 four-cylinder TFSI engine inside the Audi allroad shooting brake delivers 292ps of power and generates 380Nm of torque. In part-load operation, indirect injection supplements direct gasoline injection to improve fuel economy, while the exhaust manifold integrated in the cylinder head is said to enable high-performance thermal management. The 2.0 TFSI also operates together with a disc-shaped electric motor via a decoupling clutch; the electric motor outputs 40kW of power and 270Nm of torque.
A second electric motor, which is separate from this drive unit, is mounted to the rear axle. It supplies propulsive power at low and moderate vehicle speeds with maximum power of 85kW and 270Nm of torque. According to Audi, it can also be operated in tandem with the motor and engine at the front axle if the hybrid management system decides that all-wheel drive makes sense, before adding that, in such situations, e.g. on a slippery road or in light off-road conditions, this essentially makes the Audi allroad shooting brake an e-tron quattro.
Located just forward of the rear axle is a lithium-ion battery that consists of eight modules. The liquid-cooled battery has an energy capacity of 8.8kWh, which is enough for 50km of all-electric driving. An Audi wall box is used for stationary charging; it can operate with different voltages and plug connector types, and regulates the energy transfer.
Drive select management offers three driving modes. EV mode, Hybrid mode and Sport mode. In EV mode, which prioritizes all-electric driving, the front drive unit is inactive, and the electric motor at the rear axle can accelerate the two-door car to a top speed of 130km. In Hybrid mode, the electric motor in front acts as a generator - driven by the engine, it charges the battery, and extends the car's electric driving range. Finally, in Sport mode, the electric motor at the rear axle works together with the 2.0 TFSI in a boost mode, in which both drive units output propulsive power.
Depending on the driving situation, releasing the accelerator pedal can cause all drive units to be decoupled, or it can result in energy recovery by regenerative braking. The driver can use the Hold and Charge functions in the MMI user interface to increase storage of electric energy so that it can be used over the final miles to the destination.

15 January 2014


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