By Audi Media
Driver assistance systems
In the new A3 Cabriolet, Audi is making driver assistance systems available that come directly from the full-size class. Adaptive cruise control (ACC) is the most complex of the optional driver assistance systems. At speeds between 30 km/h and 150 km/h (18.64 mph and 93.21 mph), the radar-based cruise control system – whose sensor is placed in the lower section of the Singleframe grille – maintains a desired distance to the vehicle ahead in the new open-top Audi. In many situations, the system accelerates and brakes autonomously; the driver can set the distance and dynamic control behavior over four stages.
In the 1.8 TFSI with its S tronic, a Stop&Go function extends the control range of the ACC downward. When the vehicle ahead stops, the system stops the Cabriolet behind it. If the vehicle ahead drives off again within three seconds, it automatically drives off to follow the vehicle in front. If the assistance package is ordered, which bundles multiple systems, the ACC control range is extended upward to a vehicle speed of 200 km/h (124.27 mph).
Audi side assist helps the driver when changing lanes. From a speed of 30 km/h (18.64 mph), its radar sensors monitor the road to the rear up to a distance of around 70 meters (229.66 ft). As soon as the system detects another vehicle that might be in the blind spot or approaching rapidly, it classifies the lane change as critical, and it warns the driver via an illuminated LED on the relevant exterior mirror. If the driver still activates the turn signal in such a situation, the indicator flashes brightly several times.
Autonomous steering: the park assist
Audi offers several systems for convenient parking that range up to the park assist with selective display, which can reverse the new A3 Cabriolet into a parking space. At moderate speeds, the system measures the parking spaces using its ultrasonic sensors. A notification appears in the driver information system display when the system finds a suitable spot. When the driver now puts the car in reverse, the system takes over steering control via the electromechanical steering system – the driver only has to accelerate, shift gears and brake.
When the system has detected a suitable parallel or perpendicular parking space, the park assist steers into it, if necessary in several forward and reverse maneuvers. It provides similar assistance when leaving parallel parking spaces. The park assist can be supplemented by a reversing camera, which is located in the handle of the trunk lid.
Starting at around 65 km/h (40.39 mph), Audi active lane assist is activated, and it detects lane lines on the road with its video camera. If the new A3 Cabriolet begins to approach one of the lane lines without a turn signal being activated, it guides the driver back into the lane with a gentle pulse of the electromechanical steering system. In the MMI user control system, it is possible to configure a vibration in the steering wheel as feedback and define the time of the intervention. In the “early” setting, the system assists the driver in steering down the center of the lane.
Working together with the MMI navigation plus, Audi active lane assist offers an additional function – camera-based traffic sign recognition. Based on image data from the camera, and comparing this to data from the navigation system, it shows speed limits and signs such as “no passing” zones. A third feature of Audi active lane assist is the high beam assistant – which is available separately – which autonomously switches between high beam and low beam headlights.
A number of versions available: Audi pre sense
The Audi pre sense safety system is available in a variety of versions. Audi pre sense basic, which is available as a stand-alone subsystem, detects an unstable driving state via sensors of the electronic stabilization control (ESC) system. In this case, it pretensions the front seat belts, and if the Cabriolet begins to skid, it closes the windows.
The Audi pre sense front version is included as part of adaptive cruise control. It helps the driver avoid an impending collision or at least minimize its severity. In a critical situation, the system preconditions the brake system and warns the driver via visual and acoustic signals.
In the second stage, a brief braking pulse occurs – a warning jolt. If the driver now brakes, the system helps to avoid a collision. If the driver remains passive, Audi pre sense front initiates braking. If a collision occurs, a function becomes active that is a standard feature of the new Audi A3 Cabriolet – the multicollision brake assist. In many situations, it prevents the car from continuing to roll in an uncontrolled manner, and it activates the car’s interior lighting and hazard warning system. If the Audi connect system is installed, it initiates an emergency phone call.
At speeds under 30 km/h (18.64 mph), City Emergency Braking function is ready to assist – another feature of Audi pre sense front. If the driver does not initiate any reaction to an impending collision with a vehicle driving ahead, or a stationary vehicle, the brake system is preconditioned. If the driver brakes with insufficient force, the system assists with maximum braking force. If necessary, the function automatically initiates full braking. At speeds under 20 km/h (12.43 mph) the new function can prevent an accident altogether in some situations. In others, it significantly reduces the vehicle’s speed at impact.