|The Audi Sport quattro concept. Click to enlarge.|
At the upcoming 2013 IAA in Frankfurt am Main, Audi will present the Audi Sport quattro concept show car—a coupé plug-in hybrid with a system output of 515 kW (700 hp). The original Sport quattro, which made its debut at the 1983 IAA and was designed as a homologation model for the World Rally Championship, delivered 225 kW (306 hp).
The new Audi Sport quattro concept show car, which picks up on an Audi quattro concept study of three years ago, combines acceleration of 0-100 km/h in 3.7 seconds with fuel consumption of 2.5 liters per 100 kilometers (94 mpgUS)—a CO2 equivalent of 59 grams per kilometer (95 g/mile).
System torque is 800 N·m (590 lb-ft). Power flows through a modified eight-speed Tiptronic to the quattro powertrain, which features a sport differential on the rear axle.
The combustion engine is a four-liter, twin-turbo V8. It produces 412 kW (560 hp) and 700 N·m (516 lb-ft) of torque. The cylinder on demand (COD) system, which deactivates four cylinders under part load, and a start-stop system make the sonorous eight-cylinder unit very efficient.
Located between the 4.0 TFSI and the transmission is a disc-shaped electric motor producing 110 kW and 400 N·m (295 lb-ft). It draws its traction energy from a liquid-cooled lithium-ion battery in the rear with a capacity of 14.1 kWh.
The show car is charged via an Audi wall box, which uses intelligent charge management to ensure the optimal feed of energy to the lithium-ion battery. The Audi Sport quattro concept can cover up to 50 kilometers (31 miles) on electric power alone. An intelligent management system controls the interplay between the two drives as needed, and the driver can choose between various operating modes.
The customer can choose between various characteristics for the Audi Sport quattro concept depending on the operating and driving strategy. A choice of three modes is available. EV mode is for purely electric driving; Hybrid mode for maximum efficiency; and Sport mode for maximum performance.
In EV mode, only the electric motor is active. With a peak electric output of 110 kW and 400 N·m (295 lb-ft) of torque, electric driving both inside and outside the city is possible. An active accelerator indicates the transition to hybrid operation to the driver so that he/she can consciously control the switch between electric and hybrid vehicle.
In Hybrid mode, environmental and route data are used to compute the optimal use of the electric motor and combustion engine for fuel efficiency and implement this via the operating strategy. If navigation is active, the route is optimized for efficiency. This mode also includes the ability to customize the operating strategy. If the driver wants to retain a certain amount of electric range or to drive certain route segments on electric power, he or she can use the Hold or Charge function to precisely adjust the charge of the battery even without charging from the power grid.
In Sport mode, the operating strategy sets the drive system for maximum power and performance. The electric boost function supports the combustion engine in all driving situations. The energy management system ensures that the battery always has sufficient charge. Top speed is 305 km/h (190 mph).
The lightweight construction concept also plays a large part in this dynamic performance. The occupant cell combines ultra-high-strength steel panels and cast aluminum structural elements. The doors and fenders are made of aluminum, and the roof, the engine hood and the rear hatch are made of carbon fiber-reinforced polymer. The result is a curb weight including the battery pack of 1,850 kilograms (4,079 lbs).
The front suspension features five control arms per wheel; the rear suspension follows the Audi track-controlled trapezoidal link principle. Tautly tuned springs and dampers connect the Audi Sport quattro concept firmly to the road. The dynamic steering varies its ratio as a function of driving speed. The brake calipers grip large, carbon fiber-ceramic brake discs, and the tire format is 285/30 R 21.