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For the first time, Audi is presenting a concept car with an acute design and technology focus at Pebble Beach Automotive Week in Monterey, California. The all-electric Audi PB18 E-Tron represents "a radical vision for the high-performance sports car of tomorrow."
Pushing the bounadaries
Conceived and created in the new Audi design studio in Malibu, California, with the benefit of extensive experience gained in the wind tunnel and on the race track, its very presence signals that it is destined to push boundaries.
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The technical concept behind the PB18 E-Tron has been devised using expertise gained during the phenomenally successful Audi Le Mans racing programme, and the realisation of that concept was the responsibility of the experts at Audi Sport, the Audi high-performance subsidiary.
The abbreviated name "PB18 E-Tron" refers both to the Pebble Beach venue for the premiere and to the technological DNA it shares with the Audi R18 e-Tron LMP1 racing car.
Consistently focused concepts for use
At first sight, the Audi PB18 E-Tron shows its kinship with another spectacular concept car from the brand – the Audi Aicon from 2017.
This holds true not only for characteristic design elements like the side windows that angle inwards and the significantly extended wheel arches but also in terms of their all-electric drivetrains using advanced solid-state battery technology for energy storage.
This, however, is where the similarities end. While the Aicon was designed as a fully automated, long-distance luxury vehicle – a business jet for the road – the creators of the PB18 E-Tron designed it as a radical driving machine for the racetrack and road.
Dynamics and emotion top its list of specifications. Parameters like propulsive power, lateral acceleration and perfect ergonomics determine each detail. And driver-orientation is in a completely new dimension.
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The internal working title at Audi for the showcar project was "Level Zero" – as a means of explicitly differentiating its development focus from other Audi projects that are currently working towards bringing levels 3, 4 and 5 of autonomous driving to the road.
In the Audi PB18 E-Tron, the driver is the absolute centre of attention. There are therefore no complex systems for piloted driving on board and no comfort features to add weight.
In their place are a driver’s seat and cockpit that are integrated into an inner monocoque shell that is moveable laterally depending on how many occupants are on board.
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Gael Buzyn is Head of the Audi Design Loft in Malibu, where the PB18 E-Tron was born. He describes the most important item in the specifications: "We want to offer the driver an experience that is otherwise available only in a racing car like the Audi R18.
That’s why we developed the interior around the ideal driver’s position in the centre. Nevertheless, our aim was to also give the E-tron a high degree of everyday usability, not just for the driver, but also for a potential passenger."
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When the driver’s monocoque is moved into the side position, from where the PB18 E-Tron can be steered in everyday driving like a conventional road vehicle, there is room for a passenger.
An additional seat can be accessed on the other side, integrated low above the ground and equipped with a three-point seatbelt. The driver also benefits when getting in and out of the easily accessible outside position of the monocoque, which can be moved when the door is open up to the sill.
Inspiration drawn from motorsport
A mix of aluminium, carbon and multi-material composites ensures the body of the E-Tron has a low basic weight, not least thanks to the innovative and comparatively light solid-state battery. A total weight of less than 1 550kg (3 417.2lb) can be expected.
The PB18 is 4.53m long, 2 metres wide and just 1.15m tall. These dimensions alone speak of a classic sports car. The wheelbase is 2.70m and the overhangs are compact.
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The widely extended wheel arches located opposite the central cabin are noticeable from every angle. They emphasise the extremely wide track of the PB18 e-Tron and thereby illustrate the dynamic potential of the car and the obligatory Quattro drive.
The large 22-inch wheels, each with eight asymmetrically designed spokes, are reminiscent of turbine inlets – together with the air inlets and outlets of the wheel arches, their rotation ensures excellent air supply to the large carbon brake discs.
The front is dominated by the familiar hexagon shape of the Singleframe grille, with an emphatically wide and horizontal cut. The brand logo is positioned on the bonnet, in the typical Audi sports car style.
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Large air inlets to the left and right of the Singleframe supply the necessary cooling air to the brakes and the front electric motor. Wide and flat light units with integrated digital matrix technology and laser high-beam headlights complete the face of the PB18 e-Tron.
The laser high-beam headlight with its enormous range is especially emblematic of the transfer of know-how from motorsport: This technology made its debut in the Le Mans R18 racing car, where the maximum light output at speeds topping 300km/h offered a crucial safety advantage at night as well.
Emotion without emissions: three electric motors and Quattro drive
The concept uses three powerful electric motors – one up front and two in the rear. The latter is centrally located between the steering knuckles, each directly driving one wheel via half-shafts.
They deliver up to 150kW of power to the front axle and 350kW to the rear – the Audi PB18 e-Tron is a true Quattro, of course. Maximum output is 500kW, but with boosting the driver can temporarily mobilise up to 570kW.
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The combined torque of up to 830Nm (612.2 lb-ft) allows acceleration from 0 to 100km/h in scarcely more than 2 seconds – a speed that differs only marginally from that of a current LMP1 prototype.
In normal road traffic, the driver can limit the maximum speed in favour of range. This limitation is easy to deactivate on the racetrack and can be adapted to local conditions.
The focus is not only on powerful performance but also maximum efficiency. While being driven, the Audi PB18 e-Tron recovers large amounts of energy: up to moderate braking, the electric motors are solely responsible for decelerating the vehicle. The hydraulic brakes only come into play for heavy braking.
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The concept of separate electric motors on the rear axle offers major advantages when it comes to handling. The Torque Control Manager, which works together with the Electronic Stabilisation Control (ESC), actively distributes the power to the wheels of the front and rear axles as needed.
This torque control provides for maximum dynamics and stability. Thanks to the virtually instantaneous response of the electric motors, the control actions are lightning-quick. The drive concept of the Audi PB18 e-Tron adapts perfectly to every situation, whether involving transverse or longitudinal dynamics.
The liquid-cooled solid-state battery has an energy capacity of 95kWh. A full charge provides for a range of over 310 miles in the WLTP cycle. The Audi PB18 e-Tron is already designed for charging with a voltage of 800 volts. This means the battery can be fully recharged in about 15 minutes.
The Audi PB18 e-Tron can also be charged cordlessly via induction with Audi Wireless Charging (AWC). This is done by placing a charging pad with integral coil on the floor where the car is to be parked and connecting it to the power supply.
The alternating magnetic field induces an alternating voltage in the secondary coil fitted in the floor of the car, across the air gap.
High-tech from the LMP1 class: the suspension
The front and rear have independent suspension on lower and upper transverse control arms, and, as commonly found in motor racing, a push-rod system on the front axle and pull-rod system on the rear – in both cases with adaptive magnetic ride shock absorbers.
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The suspension of the Audi R18 e-Tron Quattro Le Mans racing car served as the model for the basic architecture.
The wheels measure 22 inches in diameter and are fitted with 275/35 tyres in the front and 315/30 in the back. Large carbon brake discs with a 19-inch diameter, in conjunction with the electric brake, safely and steadily decelerate the Audi PB18 e-Tron even in tough race track conditions.
The path to volume production – electric mobility at Audi
Audi added a first plug-in hybrid to its range in 2014 in the guise of the 150kW (204PS) A3 e-Tron – its battery units can be recharged by recuperation and cable, and give it an all-electric range of up to 50km in the NEDC.
The Q7 e-Tron made its debut in 2016: It is powered by a 3.0 TDI engine combined with an electric motor, with a combined 275kW (373PS) and 700Nm (516.3 lb-ft) of torque.
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It accelerates from a standing start to 100km/h in 6.2 seconds and is particularly efficient. In all-electric mode, it has a range of up to 34 miles while producing zero local emissions. It is also the world’s first plug-in hybrid with a V6 compression ignition engine and Quattro drive.
Another concept car unveiled by Audi in 2015 at the Frankfurt Motor Show, was the e-Tron Quattro concept – the forerunner of the brand’s first all-electric-drive production automobile.
As a radically reconfigured SUV, it offers a range of more than 248 miles in the WLTP cycle with the spaciousness and comfort of a typical full-size automobile from Audi. The production version of this groundbreaking e-SUV, named Audi E-Tron, will debut in September 2018.
Roadtrip, circuit or piloted city-mobile – a new mobility service
Audi has meanwhile been building a new family of visionary automobiles since 2017 as a preview for the next decade – electrically powered and precisely focused on their respective use scenarios.
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Cars currently in the market are always conceived as a versatile synthesis between highly conflicting requirement profiles – in practice, this often means compromises must be made. In contrast, the current concept cars will occupy a new, consistent position in an increasingly diversified market.
The Audi Aicon long-distance luxury vehicle started things off at the IAA 2017; the E-Tron is now marking another milestone. Additional vehicle concepts, such as those for example for urban traffic, are already being developed and will make their public debut in the coming months.
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As part of a premium sharing pool with highly individual models, they will all sharpen the profile of the Audi brand even further in the future – as custom-tailored products and services for highly demanding customers who want to combine mobility, emotion and experience in every situation of their lives.
These customers can then decide whether they only want to use the vehicle of their choice temporarily and exchange it for another when needed, or if they would rather purchase it permanently, as today.
