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Recently updated on October 4, 2021 at 09:28 am
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Crash-proof, torsionally stiff, aerodynamic - the body of the Q4 e-tron and the Q4 Sportback e-tron combines many strengths. Large components made of hot-formed steel form the strong backbone of the passenger cell and make up 26 percent of its weight. They combine low weight with very high tensile strength and are used wherever high forces have to be absorbed in a collision - in the transition between the side members and the passenger cell, in the A and B-pillars, in the roof pillars, as double Cross stiffening under the front seats and in the side skirts.
High protection in the event of a side impact: the B-pillars and the hybrid sill
The B-pillars are designed in such a way that in the event of a side impact they deform more strongly in the lower area than in the upper area, in order to specifically dissipate the energy here. The sills also have a demanding task, namely protecting the high-voltage battery. That is why they are designed in a new type of hybrid construction: an extruded aluminum profile serves as the core, and webs inside it stiffen it and divide it into several chambers. A jacket made of high-strength, hot-formed steel encloses the profile. The material aluminum on the body cell of the Q4 e-tron and the Q4 Sportback e-tron almost ten percent share.
Elaborate insulation measures reduce the transmission of road and rail throughout the body Rolling noise. The large cavities such as the side members and the sheet metal roof enclose foam bodies, and acoustic capsules made of lightweight foam lie above the rear electric motor and on the front wall. Components such as the instrument cross member, the wheel arches, the pillars and even the rear bumper are also provided with insulating and damping elements. The front window is made of acoustic glass as standard, as is the front side windows on request. Another option is dark privacy glass for the rear and rear areas. As a result, the electric compact SUVs from Audi are among the best cars in their class in terms of interior noise levels.
Good aerodynamics: drag coefficient only 0,26
Form follows function: the distinctive design of the two compact electric SUVs impresses with their high aerodynamic quality. The Audi Q4 e-tron and the Q4 Sportback e-tron achieve cwValues of 0,28 and 0,26, which benefit efficiency and range.
A decisive factor for this is the basic body of the body - the greenhouse at the rear of both models is strongly indented. The controllable cooling air inlet is another important factor in the concept. In front of the package of cooler and condenser, which flows through the central lower air inlet, there is a frame with an electric blind. It is opened depending on the situation when the units need cooling air, for example when charging. In most situations, the blinds remain closed to avoid the energy losses that occur when the air flows through the narrow cooling ducts. The resulting range advantage is around six kilometers.
The underbody of the Q4 e-tron is designed to be almost smooth. In front of the front wheels, three-dimensional spoilers optimize the flow of air - their aerodynamic advantage means no less than 14 kilometers more range. The arms of the rear axle are partially covered, which means another four kilometers. The underbody ends in a wide diffuser that reduces the lift on the rear axle.
Detailed solutions, on which the Audi aerodynamicists worked closely with the designers, ensure a further increase in range. At the front of the vehicle, under the headlights, there are narrow vertical bars - they serve as a front spoiler and guide the airflow so that it flows neatly along the side of the vehicle. This effect is five kilometers. A tiny step on the exterior mirror caps with a 0,5 millimeter radius allows the flow to stay there longer. This so-called turbulator edge has a similar effect to the indentations in a golf ball: It ensures that the air is swirled around in a targeted manner, which has a positive effect on aerodynamics and is good for a range of two kilometers.
The 19-inch aero wheels with their flat design are also optimized for low-loss airflow - an increase of five kilometers. With the Q4 e-tron the tailgate seal is designed precisely for the pressure conditions generated by the roof spoiler - that brings a range of four kilometers. The aero baffles that lengthen the D-pillars create a defined break in the flow.
With the Q4 Sportback e-tron the spoiler sits much lower - deep down on the split, very flat rear window. The area in which the air swirls after the demolition is limited to the zone under the spoiler and is significantly smaller than on the Q4 e-tron. The spoiler solution not only emphasizes the unique design of the SUV coupé - it stands for a range of around 12 kilometers and is also particularly effective in reducing lift on the rear axle.
