![]() ![]() During an emergency brake (possibility of wheel “block”) the ECU controls the electromagnets of two valves simultaneously causing them to operate. In this case ABS does not affect the brake system. Brake chamber is connected to the master cylinder through the open output valve and the input valve is closed.Īt normal operating pressures (no wheel “block”) brake fluid passes from the master cylinder to the brake chamber without restriction as the pressure of the fluid in the cylinder and the chamber is equal and proportional to the amount of pressure applied on the brake pedal. In the initial state of the hydro-pneumatic unit, the two electromagnetic valves and the hydraulic pump motor are empty. By controlling these valves, the ECU increases, decreases or maintains constant pressure in the brake chamber. Individually adjustable valves are fitted in pair at each wheel: normally open input valve and normally closed output valve. Hydro-pneumatic unit incorporates hydraulic accumulator, electro-hydraulic pump and valves. ![]() ABS controller).Įach controlled wheel is fitted with pinion and inductive sensor comprising a permanent magnet and a coil. Rotation of the pinion induces AC voltage in the coil sensor, which frequency is proportional to the angular speed and the number of teeth of the wheel. During this time, the electronic control unit changes the torque. The ABS indicator light does not flash before, during and after the above action, i.e. control unit does not perceive the situation as an error, but as the normal operation of ABS.Īn analog ABS sensor is shown in fig.1 and a digital ABS sensor is shown in fig.2. If there is some increase to the individual rate of any of the wheels when accelerating, this wheel receives breaking pressure to reduce the difference. New cars are fitted with anti skid system, which basically works opposite to the ABS. This means that there’s a possibility of a wheel "block". The modern equivalent is now called "Stability Control" and is much more advanced than the standard ABS. The main function of the ABS system is to control the speed of the wheels when the brake pedal is pressed by checking whether any of the wheels decreases its speed faster than the others.
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