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In addition, the system activates the hazard warning lights to alert following traffic to the critical situation. In this process, the Rear-end collision alert signal (RECAS) is triggered, which flashes the hazard warning lights at a high frequency. Audi pre sense rear is active in background over the car’s entire driving speed range with the exception of trailer towing situations. The adaptive cruise assist (ACA) assists the driver with longitudinal and lateral control over the entire speed range – substantially enhancing comfort on long journeys, in particular. It incorporates the functions of adaptive cruise control, traffic jam assist and active lane assist.
Driver assistance systems
If the car approaches a line without the turn signal being activated, the system helps the driver to steer back into the lane by means of gentle but noticeable interventions in the electromechanical power steering. In the MMI system, the driver sets how early the control intervention should occur. In the case of an early steering intervention point, the system guides the driver towards the middle of the lane by gentle, centering steering interventions. In addition, the driver may choose to be warned by a vibration of the steering wheel when crossing detected lane markings. Parking system plus informs the driver, visually and audibly, about obstacles in front of and behind the vehicle. Ultrasonic sensors inconspicuously integrated into the bumpers measure the distance.
Field of view: the ACC stop & go covers a wide, wedge-shaped field
The system keeps the distance to the car in front constant by automatically braking and accelerating. In conjunction with S-tronic or tiptronic, the Stop & Go Function allows independent braking to a standstill and automated restarting at the driver's request. Adaptive cruise control maintains a desired driving speed constantly.
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The ACC stop & go uses two radar sensors installed at the front of the vehicle which are automatically heated when it is cold. They transmit radar waves at a frequency of 76.5 gigahertz covering a roughly 40 degree wedge-shaped field measuring approx. The driver can influence the function of the ACC stop & go; the interval to the vehicle ahead and the control system dynamics are adjustable in steps. The system accelerates smoothly or sharply, depending on the setting. Deceleration is limited to roughly 4 m/s2 (13.12 ft/s²), which is a good third of what is possible.
Audi side assist
This sends the images from the 360 degree cameras to the MMI monitor. They drastically expand the field of view, and the driver can choose from among multiple views. The figures do not refer to a single, specific vehicle and are not part of the offering but are instead provided solely to allow comparisons of the different vehicle types. Collision avoidance assist helps the driver steer around an obstacle in a critical situation. The system uses data from the two radar sensors and the front camera for this purpose.
However, the driver can temporarily override the limit by kick-down, and the speed limiter can be completely deactivated at any time from the steering column stalk. Ultrasonic sensors measure the distance, the MMI display depicts it visually. The virtual driving path display also shows lateral guide lines which are precalculated based on the currently selected steering input.
Radar sensor: the ACC in the Audi A4
Multicollision brake assist automatically brakes the vehicle in the event of an accident, reducing the danger of skidding as well as the risk of further collisions. The function uses the relevant sensors to detect a collision; the severity of the crash and the speed reduction are calculated by the safety computer. The same is true if the ESC, the brake system or the electrical system are not functioning.
Audi pre sense front / Audi pre sense city
Detecting lane markings, roadside structures and vehicles in adjacent lanes allows the system to make a virtual driving path to help guide the vehicle. The ACC is connected to the Audi navigation system and is capable of reading traffic signs and providing the driver with that information. For example, when the speed limit changes from 55 to 35, ACC automatically reduces the vehicle’s speed to match the new restriction. When the navigation system detects that you are going to make a turn, ACC automatically reduces the speed to a safe level before resuming it once the turn has been made.
Multicollision brake assist
The reversing camera simplifies maneuvering by showing the zone behind the vehicle on the MMI display. It shows the calculated driving track based on the steering angle as well as auxiliary lines and guide lines. For parallel parking, the latter lines precisely direct steering into the parking space in conjunction with steering reversal points. The blue pictured surface in the camera image indicates where the vehicle will be positioned after the parking procedure. The reversing camera is inconspicuously integrated into the handle trim strip of the luggage compartment lid. It is activated as soon as the driver engages reverse gear or pushes the respective button.
Stop-and-go adaptive cruise control makes it easier to accelerate, decelerate, and maintain distance and speed. Radar, camera, laser scanner, and ultrasonic sensors are used by adaptive cruise assist to continuously monitor the environment and support highway driving. The zFAS serves as the central interface for piloted driving functions and for nearly all of the assistance systems. Whether the given system is the crossing assist, the emergency braking function, adaptive driving assistant or traffic jam pilot – its functions are no longer coupled to just a specific sensor. Each system makes use of the vehicle surroundings model and can operate more effectively as a result of this model’s high precision. This makes it possible for the vehicle, for example, to recognize the tail end of a traffic jam and brake appropriately.
Emergency assist detects, within system limits, when the driver is inactive. In such a case, the system assumes control of the vehicle and automatically brakes it to a standstill in its own lane. If it detects that the driver is inactive, it prompts the driver repeatedly, via visual and audible warnings and by brake jolts, to actively take over control of the vehicle again. With the first strong brake jolt at a driving speed below 80 km/h (49.7 mph), the hazard warning lights are also activated to warn the surrounding traffic.
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At the same time, the constant speed mode of driving contributes towards lower fuel consumption and lower CO2 emissions. The Audi side assist lane-changing assistant helps the driver to change lanes at driving speeds of 15 km/h (9.3 mph) and faster. It uses two rear-mounted radar sensors with a scanning range of roughly 70 meters (229.7 ft).
If the driver so wishes, the system controls the freewheeling and coasting operation of the engine in cooperation with other control units. The predictive system always maintains a driving style that reflects the driving program selected – from efficient to sporty – and uses scope for recuperation in the Audi e-tron. Audi pre sense basic initiates preventive safety measures for occupants as soon as it recognizes a critical driving state. It utilizes information from various vehicle systems to determine this. For instance, it intervenes if the Electronic Stabilization Control (ESC) sensors detect skidding or hard braking. Then the system pretensions the seat belts of the driver and front passenger electrically to reduce their forward or lateral movements.
