Hello steemians today i am explaining what is AntilockBraking System (ABS) what is it and why is it necessary.Sometimes on applying brakes too hard or applying brakes onslippery surfaces can cause the wheels to lock and slide. Due to locking ofwheels you lose steering control and the stopping distance will be longer ascar slides on the surface due to its momentum.The Antilock Braking System (ABS) prevents the lockdown or slippingof wheels doesn’t matter how hardly you have applied the brakes or how muchslippery the road surface is, thus stopping distance reduces and steeringalways remains in your controlNow let’s see its technical specification and workingIt mainly consist of A brake pedal: pedal which driver pushes to stop the car.A master cylinder: technically it’s a device which is use toconvert non-hydraulic pressure to hydraulic pressure, in simple language whenyou push the brake pedal it converts the mechanical force to hydraulicpressure.A wheel speed sensor: A sensor to measure the wheel speedThe electronic control unit (ECU): The electronic controlunit is like a computer it controls many important functions of the car enginesuch as proper air and fuel ratio, correct ignition timing, etc.

In ABS readingsfrom wheel speed sensors are constantly sent to the controller and if any wheellooses traction then controller immediately limits the braking force. The hydraulic controlunit also called hydraulic modulator: It controls the solenoid valves though whichhydraulic fluid leads to each of the wheels.Now let’s see how ABS worksThe wheel speed sensor has a toothed rotor that rotates witheach wheel and a pickup sensor which measures the speed of the rotor.

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When the wheel rotates the pickup sensor starts sending voltagepulse signal to the electronic control unit. When the brakes are applied thewheel speed of rotation changes this sends a new signal to ECU.Readings from wheel speed sensors are constantly sent to ECUand if ECU detects any condition of locking of wheels or any wheel loosingtraction it further sends an electric voltage pulse signal to the hydrauliccontrol unit.The hydraulic control unit is commonly a three channel sizecontrol unit and has three solenoid valves to control brake pressure andprevent the locking or sliding of wheels.

These valves are installed in serieswith master cylinder and the brake circuit. In this three one solenoid valvecontrols each of thefront wheels and the second solenoid valve is used tocontrol each of the rear wheels.

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