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The situation when you are in traffic early in the morning, or even worse, late in the evening, and attention is unfamiliar to many motorists. Psychologists say that after four hours the driver's attention is reduced twice, and eight times more, six times. And, according to statistics, a quarter of all road accidents happen due to driver fatigue. Of course, there are plenty of ways to stay out of sleep, but here the driver can rely only on himself.

A fatigue control system came to help the driver to solve this problem.  It controls the physical condition of the driver-collects data, analyses and, if necessary, warns it.

The fatigue control system can now be ordered as an option for most modern cars. Sometimes this system is actually part of the basic equipment-the truth, mainly in the premium cars.

Device and operating principles

There is a need to distinguish between two types of control systems: one evaluating the actions of the driver and others driving the car.

The first fatigue control systems worked as follows: a harmless retina scan of the driver's eyes using a laser. If the eyes were closed, the steering wheel began to vibrate. In practice, the device was not effective: the reaction of the motorist to the warning was delayed.

More advanced devices include the Driver Alert Control, developed by Volvo. It estimates the very nature of the vehicle movement. If the vehicle deviates from the predetermined motion, the system considers this to be a sign of driver fatigue.

The most "complete" system can be called the Attention Assist system. Attention Assist evaluates a range of factors, from driving and driving conditions to driving behaviour and control of those controls that the driver enforces.

The control is performed by a sensor on the steering wheel that transmits the signal to the control unit. A warning lamp, a sound signal, or both shall be used for the warning. In addition to the sensor on the driver's steering wheel, the attention-building control unit also accepts data from other systems: exchange rate stability, engine management, braking system and night vision systems.

The control unit is handling incoming information. This can be: analysis of speed and control blocks for half an hour from the beginning of movement, analysis of trip duration and time of day, analysis of speed and acceleration, as well as analysis of the use of command buttons on the control panel and the use of brake pedal.  As a result of the calculations, the device can detect the driver's actions and the trajectory of the car. Such systems are activated at high speeds: at least 80 km/h, maximum = 180 km/h.




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