Monday, March 4, 2013

Automobile Active Security Systems

Security design taken for the prevention of car accidents and to avoid people being injured is called active security design, such as the ABS, EBD, and TCS are active auto security system designs. They are characterized by aiming to improving stability under transport condition of automobiles, making every effort to prevent the occurrence of traffic accidents. Besides, high-mount stop lamp, front and rear fog lamps, rear fog lamps are also active auto security system design.

ABS (Anti-lock Braking System)

It detects the rotational speed of the wheels through the sensor, calculates wheel slip rate by the computer, judges if the wheels lock, orders actuators to adjust brake pressure, and keep wheels in ideal braking mode (almost lock but not a totally lock). Correct understanding of the ABS function: it can maintain vehicles not lock and out of control under the situations of emergency braking. It will maintain steering capability of vehicles and avoid obstructions. Under normal conditions, it cannot shorten the braking distance.

EBD (Electronic Brake Force Distribution System)

It must be used with ABS. In the moment of automobile braking, it will response and calculate each of the different grounds attached to four wheels, and get the friction values. Then it will distribute the corresponding braking force according to every wheel friction values to avoid slipping, tilting and rollover risk due to different wheel brake forces. auto security system

TCS (Traction Control System)

When vehicles brake on smooth road, the wheels will slip, or even be out of control. Similarly, when vehicles start or rapidly accelerate, the driving wheels may slip, too. On ice or other smooth roads they will even be out of control and be in danger. TCS was designed for this issue. It relies on electronic sensors to detect the time when the driven wheels' speed falls below the driving wheels' (this is the characteristic of a slip). At that time, it will send a signal, adjust the ignition time, reduce valve opening, reduce the accelerator, change the gear down or brake the wheels so that the wheels will stop slip. TCS can improve vehicles’ stability and avoid the danger of over acceleration as well as drift to out of control.

EBA (Emergency Brake Assist System)

The computer detects the braking action according to the brake pedal to judge the intent of the driver for the brake. If it is an emergency brake, it will order the braking system to generate higher oil pressure making ABS work so that it can make faster braking force and shorten the braking distance.

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This article is come from:http://www.china-autosupplies.com/index.php/automobile-active-security-systems.htm

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