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Anti-lock brakes (ABS)
Anti-lock braking system is designed to eliminate wheel lock under heavy braking.
The main function of ABS:
- Reducing the stopping distance by eliminating the wheels from locking under heavy braking;
- Improving the steering stability during braking.
Anti-lock brake system operates on the basis of information from four sensors transmitted block ABS. The system controls each wheel individually and reduces the fluid pressure in the wheel brake, the wheel is starting to be blocked.
Under normal conditions, the standard braking system provides braking torque to the wheels blocking, the detected block of management ABS. During normal braking normally open inlet valves and the exhaust valves are normally closed.
When the ABS control unit detects wheel lock, it controls each valve to increase or decrease the pressure.
ABS control unit determines the speed and rate of deceleration of each wheel on the basis of information from the wheel speed sensor. When braking wheel speed decreases, and ABS unit determines a difference between the vehicle speed and wheel speed. If the deceleration of some of the wheels exceeds the expected value, ABS unit determines the beginning of the lock and opens the corresponding solenoid valves to reduce the pressure of the brake fluid. At this wheel speed increases and the solenoid pressure relief valve is closed and there is an increase of the brake pressure in the wheel cylinders of the corresponding wheels.
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