How does the car's anti-lock braking system work?
Most people are familiar with the term anti-lock braking system(ABS),but many people know very little about anti-lock braking,how it works,and if special maintenance is required or parts that can be replaced in the anti-lock braking system are poorly understood.
Automobile rubber accessories tell you that anti-lock brakes are essentially enhanced or improved types of ordinary brakes.In short,the anti-lock braking system is designed to prevent the brake from locking and slipping when braking is difficult or when braking on a wet or smooth surface.By preventing dangerous taxiing and allowing the driver to maintain steering control while trying to stop,this adds a significant safety margin to everyday driving.So how do we use it?Follow the editor to understand.
Let's first understand how the anti-lock brake works
All anti-lock braking systems control tire slip by monitoring the relative deceleration rate of the wheels during braking.If one wheel begins to decelerate at a faster speed than the other wheels,or at a faster speed than programmed into the anti-lock control module,it indicates that the wheels are starting to slip and there is a risk of disconnecting traction and locking.The ABS system responds by instantaneously lowering one or more wheels affected by hydraulic braking.
Electric solenoid valve is used to maintain,release and reapply hydraulic pressure to the brake.This produces a pulsating effect,which can usually be felt in the brake pedal during braking.The driver may also hear the hum or flutter of the ABS hydraulic system.
The rapid adjustment of the brake pressure in the brake circuit reduces the brake load on the sliding wheel and allows it to regain traction,thus preventing locking.It is the same as a brake,except that the ABS system automatically completes each brake circuit,and the speed is impossible for humans.Depending on the system,it can reach dozens of times per second(some are faster than other brakes).
Once the deceleration rate of the affected wheel is restored to be the same as that of the other wheels,the normal braking function and pressure are restored,and the anti-lock brake device returns to the passive mode.
Anti-lock brake control module
ABS electronic control module(may be called EBCM"electronic brake control module"or EBM"electronic brake module")It is a microprocessor,its function is similar to the engine control computer.It uses input from sensors to adjust the hydraulic pressure during braking to prevent the wheels from locking up.The ABS module can be located under the luggage compartment,passenger compartment or under the hood.It can be a separate module or integrated with other electronic devices,such as body control or suspension computers.In the newer ABS system,it is installed on the hydraulic regulator.
The key input of the ABS control module comes from the wheel speed sensor and brake pedal switch.When the brake is applied,the switch sends a signal to the control module,which changes it from"standby"mode to active mode.
When ABS braking is required,the control module starts to act and commands the hydraulic unit to adjust the braking pressure as required.On systems with pumps,it also powers pumps and relays.
Automobile rubber accessories also say that like any other electronic control module,the ABS module is susceptible to damage caused by electrical overload,shock and extreme temperatures.If there is a defect,the module can usually be replaced,except on some of the latest systems where the module is part of the hydraulic modulator assembly.
Anti-lock brake pump and accumulator
In some ABS systems,high-pressure electric pumps are used to generate power assist for normal braking and reapply brake pressure during ABS braking.In some systems,it is only used to reapply pressure during ABS braking.
The pump motor is powered by a relay,which is turned on and off by the ABS control module.The fluid pressure generated by the pump is stored in the"accumulator".The accumulator on the ABS system,where the hydraulic regulator is part of the master cylinder assembly,which consists of a pressure storage chamber filled with nitrogen.
If the pump fails(the warning light comes on when the standby pressure drops too low),there is usually enough standby pressure in the accumulator and 10 to 20 power stops can be made.After that,there is no power assist.The brakes are still effective,but more effort is required.
On an ABS system with a conventional master cylinder and a vacuum booster for power assist,a small accumulator or a pair of accumulators can be used as a temporary holding container for brake fluid during the hold-release-reapply cycle.This type of accumulator typically uses a spring-loaded diaphragm instead of a nitrogen-filled chamber to store pressure.
So how do we operate?The following are the do's and don'ts
Millions of cars use anti-lock braking systems(ABS),but many drivers still do not know the"correct way"to use ABS in an emergency.So here is the“do or not do”of anti-lock braking:
What to do:Place your feet on the brake pedal.Maintain the stability and continuous pressure of the brake pedal to allow the four-wheel ABS to work normally.Even if the brake pedal is pulsating,avoid depressing the brake.If you have a light truck with rear-wheel anti-lock(RWAL)brakes,use enough force to brake the pedals to stop your truck without locking the front wheels.This way you can maintain steering control,and the rear wheel anti-lock brake system prevents the vehicle from skidding.
Please leave enough distance:When driving in good conditions,stay behind the vehicle for three seconds or more.If the conditions are dangerous,please allow more time.
Practice driving with ABS:When the anti-lock brake is activated,it is used to the pulsation that occurs in the brake pedal.An empty parking lot or other open area is a great place to practice emergency parking.
Do not do:
Compared with vehicles without anti-lock brakes,please do not drive ABS equipped vehicles more actively.In any vehicle,driving a corner faster,suddenly changing lanes,or performing other aggressive steering maneuvers are risky.
Through the four-wheel ABS system,the pumping brake can open and close the anti-lock braking system,thereby reducing braking efficiency and increasing braking distance.ABS automatically provides you with brakes faster than your manual operation,and can achieve better steering control.More importantly,it can also brake on each wheel as needed-this is something you cannot do.
Automobile rubber accessories remind you not to forget to turn.Four-wheel ABS can help you avoid dangerous situations.When ABS is active,these conditions are normal,letting you know whether the anti-lock brake system is working properly.However,when braking normally on dry roads,there should be no ABS feedback.ABS should only work when the panic stops or the road is wet,icy,smooth or covered with loose gravel.
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