6.1.15. Anti-blocking system of brakes (ABS)

The anti-blocking system of brakes (ABS) operates pressure in contours of brakes of all wheels for prevention of blocking of wheels at heavy braking. ABS provides:
– controllability the car at the emergency braking;
– a car stop at emergency brake application without leaving from the chosen trajectory of the movement.
At failure detection in system diagnostics of malfunction and inclusion of the mode of safety is provided, the brake system works as standard.
Hydraulic and the electronic control unit comes into signals of sensors of speed of the car, a fortune of a paving, the direction of the movement and frequency of rotation of wheels.
The electronic control unit determines the optimum frequency of rotation of a wheel.

Electronic system of distribution of brake efforts (EBD)
Use of electronic system of distribution of brake forces in comparison with installation of the proportional valve provides ideal distribution of pressure in contours of lobbies and back brakes. As a result considerably efficiency of braking increases and blocking of back wheels is prevented.

Advantages of electronic control
Functional improvement of parameters of the main brake system.
Compensation of various coefficients of coupling a wheel with the road.
Exception of installation of the proportional valve.
Instructions on malfunction by means of a control lamp.

Comparison of characteristics of distribution of brake efforts

Fig. 6.63. Comparative characteristics of distribution of brake efforts


Comparative characteristics of distribution of brake efforts are shown in fig. 6.63.

Check hydraulic and electronic control unit of ABS
Check of the hydraulic and electronic block (ABS) see table 6.7.

Scheme of input-outputs of an electronic control unit of ABS (HECU)

Fig. 6.64. Socket of an electronic control unit of ABS



Fig. 6.65. Scheme of input-outputs of an electronic control unit of ABS


The scheme of input-outputs of an electronic control unit of ABS is submitted in fig. 6.65.