Driver assistance systems
Driver assistance systems enable safe, relaxed driving
Based on intelligent sensor technology, driver assistance systems constantly monitor the vehicle surroundings as well as the driving behaviour to detect potentially dangerous situations at an early stage. In critical driving situations, these systems warn and actively support the driver and, if necessary, intervene automatically in an effort to avoid a collision or to mitigate the consequences of the accident.
- Improved safety for occupants and other road users
- Avoidance of accidents, mitigation of the severity of accidents
- New safety functions by means of networking existing systems and components
- Modular safety systems
- Synergies due to expertise in system development and networking
Predictive emergency braking system
Assists in avoiding rear-end collisions and mitigating the consequences
Accident research shows that prior to rear-end crashes most drivers do not apply the brake pedal strongly enough, or do not apply the brakes at all. That is why Bosch has developed the predictive emergency braking system. It assists in avoiding rear-end collisions and mitigating the consequences. The predictive emergency braking system becomes active as soon as the vehicle is started, and supports the driver at all speeds — both by day and by night. Nevertheless, the driver still has a responsibility to pay attention and drive carefully at all times.
Predictive pedestrian protection
Helps to prevent collisions and minimize accident severity
A predictive pedestrian protection system can recognize impending accidents with pedestrians who are in the same lane as the vehicle or who are moving dangerously into this direction. If the system detects a critical situation for pedestrians, it can warn the driver or automatically initiate emergency braking. In this way, the collision with the pedestrian can be avoided, or the vehicle's speed can at least be reduced as much as possible prior to impact. This can reduce the risk of serious injury to an absolute minimum.
Lane departure warning
Warns of unintentional straying from the marked lane
Lane departure warning uses a video camera to detect lane markings ahead of the vehicle and to monitor the vehicle's position in its lane. When the function detects that the vehicle is about to unintentionally move out of the lane, it warns the driver by means of a visual, audible and/or haptic signal, such as steering wheel vibration. These warnings signal the driver that the vehicle is drifting off course, allowing him/her to counter steer accordingly. The function does not issue a warning when the driver activates the turn signal to change lanes or turn intentionally.
Lane keeping support
Actively assists the driver to remain in the marked lane
This function also uses a video camera to detect the lane markings ahead of the vehicle. If it detects that the vehicle is getting too close to the side of its lane, Lane Keeping Support will take action. In vehicles with electric power steering, Lane Keeping Support will gently but noticeably counter steer, to keep the vehicle in the lane. In vehicles without electric power steering, counter-steering can be achieved by applying braking power to individual wheels. The driver is always responsible for control of his/her vehicle and can override the counter steering at any time. When the driver activates the turn signal to intentionally change lanes or turn, the function does not intervene.
Lane change assist
Warning against impending collisions when changing lane
Lane change assist can prevent critical situations from occurring when changing lanes, thereby reducing the risk of accidents. The system works by using two mid-range radar sensors in the rear of the vehicle to monitor the areas next to and diagonally behind the vehicle.
When the lane change assist system detects vehicles in the driver’s blind spot or approaching rapidly from the rear, it gives the driver a visual warning, for example, an illuminated symbol in the area of the side mirrors. When the driver activates the turn signal to indicate a lane change, the system can also give an audible and/or tactile warning to make the driver aware of potential hazards.
Construction zone assist
Helps maintain a lateral safety distance on construction sites
The construction zone assist is an extension of lane keeping support and is also intended for narrow highway construction sites. It is based on a stereo video camera and is active at speeds of up to 100 km/h (62 mph). The function helps the driver to maintain a lateral safety distance between vehicles in the adjacent lane and guard rails or crash barriers when driving in a narrow lane.
By measuring the height of objects and detecting open spaces thanks to the stereo video camera, the construction zone assist can also detect other vehicles and lane markings, as well as lane boundaries such as cement walls, guard rails and crash barriers. If the vehicle approaches a boundary or a vehicle, the system can warn the driver or correct the vehicle motion via a steering or braking intervention.
The function can also prevent the driver from driving into a space that is too narrow by either warning the driver or automatically braking the vehicle at a later stage. For this purpose, the stereo video camera is supplemented with ultrasound sensors to monitor the lateral close range.
Rear cross traffic alert
Warning of crossing vehicles when backing out of a parking space
Backing out of a parking space at right angles to the road can often be a challenge – especially when the driver's view on the traffic passing at right angles behind his/her own vehicle is blocked by obstacles. Rear cross traffic alert can make backing out of parking spaces easier.
The system utilizes two mid-range radar sensors in the rear of the vehicle. They measure and interpret the distance, speed and anticipated driving path of vehicles detected in cross traffic. When vehicles crossing to the left or right behind the driver’s vehicle are detected, the function issues an audible and/or visual warning to alert the driver to the impending risk of collision.
Driver drowsiness detection
Can detect the onset of drowsiness
Monotonous driving, e.g. on expressways, is exhausting and quickly leads to loss of concentration. Based on steering-angle data, the function driver drowsiness detection continuously analyzes the steering behaviour of the driver to identify phases during which the driver does not steer for a brief period and then makes an abrupt correction – often a sign of failing concentration and arising tiredness. The function combines the frequency and strength of these reactions with other data such as vehicle speed, time of day and use of other indicators to calculate a tiredness index. If this index exceeds a specific value, a visual and/or audible signal can warn the driver of becoming tired reminding her/him of the danger of nodding off at the wheel.
As well as warning the driver, data concerning the tiredness of the driver can be used by other systems in the vehicle. In combination with a navigation system, for example, it is possible to display the next available opportunity to stop or take a rest break.