Anti-lock Braking System (ABS)
ABS is an automobile safety system that allows the wheels on a motor vehicle to maintain tractive contact with the road surface according to driver inputs while braking, preventing the wheels from locking up (ceasing rotation) and avoiding uncontrolled skidding. It is an automated system that uses the principles of threshold braking and cadence braking.
How ABS Works
ABS includes a central electronic control unit (ECU), four wheel speed sensors, and at least two hydraulic valves within the brake hydraulics. The ECU constantly monitors the rotational speed of each wheel with the help of wheel speed sensor; if ABS system detects that one wheel is slowing down more rapidly than the others, a condition indicative of impending wheel lock, it automatically reduces the brake pressure on this wheel by opening release valve in hydraulic cylinder , thus reducing the braking force on that wheel; the wheel then turns faster. Conversely, if the ECU detects a wheel turning significantly faster than the others, brake hydraulic pressure to the wheel is increased so the braking force is reapplied, slowing down the wheel. This process is repeated continuously and can be detected by the driver via brake pedal pulsation. Some anti-lock systems can apply or release braking pressure 16 times per second.
ABS Braking Components
There are three main components of ABS:
1. Speed Sensors
2. Hydraulic Modulator
3. Controller
Speed sensors:
The speed sensors, which are located at each wheel, or in some cases in the differential, provide this information of wheel speed.
Hydraulic Modulator:
Hydraulic modulator has two main component :
Valves:
There is a valve in the brake line of each brake controlled by the ABS. On some systems, the valve has three positions:
In position one, the valve is open; pressure from the master cylinder is passed right through to the brake.
In position two, the valve blocks the line, isolating that brake from the master cylinder. This prevents the pressure from rising further should the driver push the brake pedal harder.
In position three, the valve releases some of the pressure from the brake.
There is a valve in the brake line of each brake controlled by the ABS. On some systems, the valve has three positions:
In position one, the valve is open; pressure from the master cylinder is passed right through to the brake.
In position two, the valve blocks the line, isolating that brake from the master cylinder. This prevents the pressure from rising further should the driver push the brake pedal harder.
In position three, the valve releases some of the pressure from the brake.
Pump:
When the ABS system operates the brake lines lose pressure. The pump re-pressurizes the system.
When the ABS system operates the brake lines lose pressure. The pump re-pressurizes the system.
Controller:
The controller is an ECU (Electronic control unit) type unit in the car which receives information from each individual wheel speed sensor, in turn if a wheel loses traction the signal is sent to the controller, the controller will then limit the brake force (EBD) and activate the ABS modulator which actuates the braking valves on and off.
The controller is an ECU (Electronic control unit) type unit in the car which receives information from each individual wheel speed sensor, in turn if a wheel loses traction the signal is sent to the controller, the controller will then limit the brake force (EBD) and activate the ABS modulator which actuates the braking valves on and off.
Abs only prevents locking up of wheels.It truly enhances the braking power of the car within the sense that it permits all the tyres to possess same rotational speed instead of one having the lower one which can cause skidding
ReplyDeleteThanks
Henry Jordan
Hydraulic Seal Kits
Modern automobiles area device mainly a similar machine because the unique vehicle. despite the internal losing engine is modified by electrical Google or we usually move to auto-guided automobile it'll still be a similar understanding in transport, equipment and features. we've got been with patience patiently waiting an prolonged time for following cutting-edge.
ReplyDelete