Collision warning and Automatic car braking system

Our aim for 2020 is that no one should be killed or injured in a Volvo car,” says Thomas Broberg, a senior safety specialist at the company.


When Volvo launched its new XC60 car in November, it included as standard an automatic braking system it claims could prevent half of all low-speed rear-end collisions.

Called City Safety, the system uses a laser sensor to check the distance between the car and vehicles up to 10 metres ahead. Measuring the speeds of both cars 50 times per second, it calculates the braking force required to avoid a crash. If the driver does not react when the vehicle in front slows, the system applies the brakes.

The Volvo S60, which launches next year, is planned to be the first car to be fitted with full automatic braking to avoid collisions with pedestrians. The system uses a combined camera and radar sensor to monitor any obstacle in front of the car. The radar measures how far away it is, while images from the camera are analysed by image-recognition software to determine what the object is.

Drivers get an audible and visual warning of a potential collision, and if they do not respond the system automatically applies the brakes.

More systems under development
Volvo Car Corporation is working on many active safety systems in different stages of development. Some of these are practically finished, although not in production yet. Below is a selection of active safety systems that the company gives priority to right now, and that will be incorporated in the near future.

DRIVER ALERT sounds a warning signal if the driving pattern changes erratically within the lane.
The system thus alerts the driver of becoming drowsy, long before the eyelids start to drop. This
means better margins and greater chances at avoiding accidents caused by fatigue. Not in production yet.

VOLVO CoDriver co-ordinates information from all systems and functions, as well as evaluates
and interprets surrounding traffic. The system helps alert the driver when he or she becomes tired or stressed, then activates help functions. This gives the driver more time to take the right actions, which increases safety considerably. Not in production yet.

LANE DEPARTURE WARNING continuously monitors the road with a camera in the rear view mirror. If the wheels move outside the lane markings, a buzzer helps to inform the driver to take action. Not in production yet.

LANE KEEPING AID sounds a signal if the car drifts out of its lane. If the driver fails to steer the vehicle back on its course, the system momentarily takes over to guide the car back into the lane. Not in production yet.

EMERGENCY LANE ASSIST monitors oncoming vehicles as well, using both camera and radar. Should the driver not react on the buzzer, the system adds steering force to help turn the car back into the original lane. Not in production yet.
Volvo says its system could totally prevent collisions with pedestrians in cars travelling at 19 kilometres per hour or less, and reduce the impact of collisions above that speed by 75 per cent. Unfortunately it does not work as well in darkness and in poor weather, when accidents are particularly likely.


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