Audi reveals e-tron quattro at Frankfurt

Audi has revealed its new e-tron quattro concept on the eve of the Frankfurt Motor Show, providing a preview to the appearance, size and technical features of an all-electric Q6 e-tron model that will rival the forthcoming Telsa Model X.

The e-tron-quattro sports a bold new design that suggests future electric models from Audi will have their own aerodynamically optimised look. It draws on the latest developments in lightweight construction, aerodynamics, battery technology and electric drive systems to provide the performance to challenge the fastest of Audi's existing petrol, diesel and electric SUV models whilst delivering a claimed zero-emission range of up to 311 miles/497km.

“Audi will present an electric SUV in early 2018. The e-tron quattro concept provides a concrete foretaste of this,” said Ulrich Hackenberg, head of research and development.

Three motors and up to 496bhp
At the heart of Audi’s latest concept is an in-house developed electric drive system. It uses three motors – one mounted up front sending drive to the front wheels and the remaining two sited at the rear acting on the rear wheels. Nominal power is put at 429bhp, although a boosting function made available in the more sportier of two drive modes temporarily increases its maximum output to 496bhp. It is accompanied by peak torque of 590lb ft.

The power is sent to all four wheels via a drive-management system. An electronic torque-vectoring function also apportions power between the individual rear wheels depending on grip levels. The gearbox offers the choice between two modes: Drive and Sport.

Audi is yet to reveal a weight figure for the e-tron quattro. However, it is claimed to have an SQ5-beating 0-100kph time of just 4.6sec. Top speed is limited to 131mph/209kph to preserve the battery charge.

Energy to run the electric motors is drawn from a large liquid cooled 95kWh battery bolted to the floor below the passenger compartment – a position aimed at providing the new SUV the lowest possible centre of gravity while achieving a front-to-rear weight distriubution of 52:48. Hinting at its modular nature, Audi says the lithium-ion unit is suitable for other future electric models.

On a full charge, the battery is claimed to provide the e-tron quattro concept with a range of over 311 miles/497km based on the criteria used in the New European Driving Cycle (NEDC) test procedure. Early tests suggest a combined AC/DC charging system operating at 150kW can store sufficient energy to provide up a range of up to 249 miles in around 30 minutes, according to Audi.

Wireless charging offered
Alternatively, the new SUV can be charged at up to 11kW via inductive means using the German car maker’s latest wireless charging technology and a piloted parking function that has been conceived to automatically park it over a charging plate imbedded in the ground. The charging process starts automatically, with a magnetic field providing an alternating AC current that is converted to DC by the e-tron quattro’s electronic package. Once the battery is topped up, the charging automatically ceases. The whole process can be monitored and controlled via a smartphone app.

An expansive array of solar cells mounted on the 1980mm-long roof also provides the battery with electrical energy. Described as the largest solar module to be used in the automotive sector, it is claimed to produce sufficient energy under a typical European climate to provide an added 622 miles of range per year.

Underpinning the new Audi is a modified version of the MLB platform from the upcoming second-generation Q5. It has been reworked with an altered floorpan and structural elements to accommodate the batteries low down for the best possible centre of gravity.

The suspension, which uses a five-link design both front and rear, receives air springs with both adaptive damping and a self-levelling function to automatically lower the body in two stages by up to 30mm for improved aerodynamic efficiency at constant motorway speeds.

Drawing on developments brought to the latest Q7, the e-tron quattro also adopts a four-wheel steering system with up to five degrees of movement on the rear wheels to reduce the turning circle and aid maneuverability at lower speeds around town while increasing agility at higher speeds.

The 22-inch wheels boast an aerodynamically optimised design and come shod with 265/40 low-rolling-resistance tyres clearly aimed more at on-road efficiency than off-road ability.

Active aerodynamics
Stretching to 4880mm in length, 1930mm in width and 1540mm in height, the e-tron quattro is 250mm longer, 30mm wider and 115mm lower than the existing first-generation Q5. Yet despite the generous dimensions, the drag co-efficient is significantly better than any of Audi's current SUV models at 0.25.

In a preview of the aerodynamic measures being pursued for the production version of the new Audi model, active body elements deploy above 80kph to provide more efficient airflow and added cooling potential at the front; the side sills extend in length by 50mm to smooth the flow of air past the rear wheels; a spoiler atop the tailgate extends by 100mm to elongate the roof line;  the diffuser extends to speed the airflow rate at the rear and flat paneling sporting a special finish resembling the surface of shark skin is used underneath.

The interior of the e-tron quattro draws heavily on the design originally unveiled on the Prologue concept at last year’s Los Angeles motor show. It provides seating for up to four, with two individual seats front and rear. Boot space is put at 615 litres – 75 litres more than that offered by the first-generation Q5. Owing to the lack of a traditional exhaust system, the luggage compartment area is set low. With the rear seats folded, capacity increases to 1725 litres – some 350 litres less than that of the new Q7.

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