What is the structure and working principle of ABS pump?

When braking, ABS can quickly judge the locking state of the wheels according to the speed signal transmitted by each wheel speed sensor, close the normally open input solenoid valve on the wheel that starts to lock, so that the braking force remains unchanged, and if the wheel continues to lock, open the normally closed output solenoid valve.

The braking pressure on this wheel is rapidly shifted down due to the presence of a line that runs through the brake fluid reservoir, preventing the wheel from being completely locked up due to excessive braking force. In keeping the braking state at the best point (slip rate S is 20%), the braking effect is the best and the driving is the safest.

The brake fluid in the front cavity of the brake master cylinder is the dynamic pressure brake fluid, which pushes the reaction sleeve to the right, which in turn pushes the booster piston to move the brake pedal push rod to the right. Therefore, when the ABS is at work, the driver can feel the pedal flutter and hear some noise.

After the car slows down, once the ABS computer detects that the wheel locking state is gone, it will let the main control valve close, so that the system can be transferred to the normal braking state to work.

If the pressure of the accumulator drops below the safe limit, the red brake fault indicator and the amber ABS fault indicator illuminate. In this case, the driver has to use a large force to apply a deep pedal-type braking method to effectively brake the front and rear wheels.

Nowadays, the vast majority of cars have long taken ABS (brake anti-lock braking system) as a standard configuration, but to say that they really understand the main functions of ABS, know what ABS can do, there are not many such people, so there are some misunderstandings about ABS.

Friends who have driven a car without ABS know that if you press the brake pedal to the end in an emergency, you can hear a squealing of tires, so two black tire marks are left on the road, which is left by the sliding friction with the road surface because the wheels cannot rotate (the technical term is called "wheel locking").

In fact, the wear and tear of the tires is still secondary, once the wheels are locked, the car is very easy to lose control, resulting in dangerous situations. If the front wheels are locked, the most direct thing is to lose the ability to steer, and hitting the steering wheel at this time will not help at all, but can only pray that the car will stop quickly!

If the rear wheels are locked, the steering ability is present, but there is a high probability that the rear wheels will slip sideways, and in severe cases, there will be a tail flick. Once the car skids or flicks, especially at high speeds, the body completely loses control and can only be resigned to fate!

Based on the fact that the wheel locking during braking will make the driver lose control of the car, so that the life safety of the driver and passengers is seriously threatened, how can the wheel lock during braking be effectively solved? This is where ABS (Anti-lock Braking System) was born.

As the name suggests, the anti-lock braking system means that the wheels do not lock when braking.

It is conceivable that when the driver quickly presses the brake pedal during emergency braking, the front wheels will not lock up, and the steering ability will still exist, so it is completely possible to take measures to avoid the danger ahead when braking. If the rear wheels don't lock up, there will be no side slip and tail flick, and control of the body remains in the driver's hands.

After the previous simple analysis, it can be concluded that in fact, the most important function of ABS is not to shorten the braking distance, but to be able to maintain the directional stability of the car when braking as much as possible.

When the anti-lock braking system is in effect, the friction between the wheels and the road surface is rolling friction, which will make full use of the maximum adhesion between the wheels and the road surface for braking, so as to improve braking deceleration and shorten the braking distance, but the most important thing is to ensure the directional stability of the car.

When ABS works, it is equivalent to a very high frequency of point brake, so in an emergency to press the brake pedal, you will definitely feel the brake pedal is shaking, and at the same time, you will hear the "click" sound from the brake master cylinder, which is ABS is working normally. Since the brake master cylinder is constantly adjusting the brake pressure, there is a continuous feedback force on the brake pedal. Therefore, in this case, it is necessary to "unwaveringly" press the brake pedal and at the same time take active measures to avoid danger.

ABS is an improved version of conventional braking technology. It works by relying on a highly sensitive wheel speed sensor mounted on each wheel and a speed sensor on the body and controlled by a computer. During emergency braking, once it is found that a certain wheel is locked, the computer immediately instructs the pressure regulator to release (depress) the brake cylinder of the wheel to make the wheel resume rotation.

The working process of ABS is actually the cyclic working process of locking-loosening-locking-release, so that the vehicle is always in a critical lock-up gap rolling state, effectively overcoming the deviation, side slip and tail flick during emergency braking, and preventing the occurrence of loss of control of the body.

1. When ABS braking, the high-speed retraction and release action of the brake cylinder will cause the high-pressure brake fluid to be squeezed frequently, resulting in loud sound, and the brake pedal will also have jitter and top foot phenomenon. Don't be bothered by this phenomenon when driving, use ABS braking in an emergency without hesitation, and press the brake directly to the end with force, and you can't relax.

Second, because the ABS emergency braking wheel is not locked, the front wheel still has a guiding role, the driver can brake while playing the direction for emergency avoidance.

3. The ABS system has very high requirements for brake fluid, so the addition of brake fluid should be strictly in accordance with the requirements of the instruction manual, and it is generally forbidden to dope different types of brake fluid. In general, the same type of brake fluid should be replaced once a year. Dot 3 or Dot 4 alcohol-based brake fluids are also available.

Fourth, ABS wheel sensor and ring gear are installed on each wheel, so always keep the sensor probe and ring gear clean, to prevent mud, oil, especially magnet substances from sticking to its surface, resulting in sensor failure or signal error to the computer and affect the normal operation of the ABS system.

5. Vehicles equipped with ABS system should strictly follow the specified tire pressure standards, and at the same time maintain the balance of coaxial tire pressure, and it is strictly forbidden to use tires of different specifications. In addition, it is necessary to pay attention to check the gap between the wheel speed sensor and the ring gear, and the excessive axial clearance of the wheel bearing directly affects the normal operation of ABS.

6. The driver should always pay attention to the ABS warning light on the dashboard while driving, if it is found that it flashes or does not go out, it means that the ABS system has been out of working state. At this time, the braking system has returned to the conventional braking interface, and the car can continue to drive, but it no longer has ABS function, and it is recommended to overhaul it as soon as possible.

How ABS works for electric vehicles.

How ABS (Anti-lock Braking System) works.

The working principle of passenger car ABS is:

1. ABS system.

It is an anti-lock braking system that imitates the tire brakes when an airplane lands.

The function of this device is that when the car brakes, it automatically adjusts the pressure in the brake tube according to the speed of the wheels, so that the wheels are always in a slip state of rolling while locking, especially for emergency braking.

It will brake intermittently, i.e. brake-release-brake, to avoid danger. Anti-lock braking device, with a frequency of 6 10 times per second for braking-release-braking pulse braking, with electronic intelligent control mode instead of manual mode, to prevent wheel locking, so that the wheels always get the maximum braking force, and keep the steering flexible.

Second, the working principle of the ABS system.

1. ABS system monitors the rotation speed of 4 wheels. When a wheel is close to locking, the system releases the brakes of that particular wheel, allowing the wheel to resume turning.

2. After the wheel is about to resume rotation, apply braking hydraulic pressure to the brake of this wheel.

3. If the wheel is about to lock up again, this system releases the brake of this particular wheel.

4. This system repeats the above process many times within 1s in order to give full play to the maximum potential of the brake and ensure the stability and normal operation of the vehicle.

How ABS (Anti-lock Braking System) works.

When a large current is applied to the solenoid valve, the plunger moves to the upper end, the channel between the master cylinder and the sub-cylinder is cut off, the sub-cylinder and the hydraulic tank are connected, the brake fluid of the sub-cylinder flows into the hydraulic tank, and the braking pressure decreases. At the same time, the drive motor starts, drives the hydraulic pump to work, pressurizes the brake fluid flowing back to the hydraulic tank, and delivers it to the master cylinder in preparation for the next braking cycle. This type of hydraulic pump is called a recirculation pump.

Its function is to return the brake fluid returned from the sub-cylinder during decompression to the high-pressure end, thus preventing the brake pedal stroke from changing during ABS operation. Therefore, the hydraulic pump must be normally open during ABS operation.

In the pressure holding process, when a small current is applied to the solenoid valve, the plunger moves to a different position and all channels are cut off, thus maintaining the braking pressure. Pressurization process: After the solenoid valve is de-energized, the plunger returns to its initial position.

The master cylinder and the sub-cylinder are reconnected, and the high-pressure brake fluid at the end of the master cylinder enters the sub-cylinder again, increasing the braking pressure. The speed of pressurization and depressurization can be directly controlled through the inlet and outlet ports of the solenoid valve.

ABS operation, direct control hydraulic device simple structure, good sensitivity. In this way, the brake pedal stroke will change when the high-pressure brake fluid is returned to the master cylinder when the hydraulic pump is working, or when the brake fluid is returned from the master cylinder during pressurization. This reaction lets the driver know that the ABS is working, which is an advantage.

However, many drivers are uncomfortable with pedal response. The following is an example of a pressure regulator that reduces pedal response.

The ABS system includes a transmission hydraulic servo braking system, a brake master cylinder, a brake cylinder, a vacuum booster and pipelines, as well as an electronic control unit, sensors, pressure regulators, warning lights, etc. After the vehicle slows down, once the ABS computer detects that the wheel locking state disappears, close the main control valve and make the system enter the normal braking state. If the accumulator pressure drops below the safe limit, the red brake fault indicator and the amber ABS fault indicator illuminate.

In this case, the driver needs to use a large force to penetrate the pedal braking mode in order to brake the front and rear wheels effectively.

This is to prevent the car from locking up and is a measure to protect people's safety.

I don't know much about it, but this is also a very important part of the car, and the sensitivity is also very high, and the speed of the wheels is also very fast, which is generally controlled by computer

I don't know exactly how it works, but I know that this thing will play a big role in the car, and if it doesn't, it will have a serious impact and get into a traffic accident later.

1. ABS is the English abbreviation of brake anti-lock braking, which is mainly to ensure that the vehicle brakes the car in the shortest distance when braking, and the vehicle also has the ability to steer and control to avoid obstacles or vehicles in time. If the ABS pump is broken, it will not affect the quality of the conventional brakes. It's just that the ABS yellow warning light on the meter will light up the alarm.

If necessary, it is best to replace the ABS pump as soon as possible. It is recommended to go to a professional repair company or a professional 4S shop for replacement.

2. The function of ABS is anti-locking, the general car begins to work at 18km h (about Ha) He is received by the ABS sensor on each tire and sent to the ABS computer board and then controlled by the ABS computer board to work The ABS pump will then pump and drain the oil at a very fast speed to achieve the effect of anti-locking.

This anti-lock braking system prevents the tires from locking up when the car brakes urgently, so that the car does not flick its tail, thus increasing safety, and is now standard in cars.

The model is different, the location is different. You can consult the 4S shop.

The ABS pump on the car used to have this effect, and today I finally figured it out, and those who have a car should pay attention.

ABS pump, Chinese translated as "anti-lock braking system". Together with airbags and seat belts, it is known as the three major inventions in the history of automobile safety. It is an automotive safety control system with the advantages of anti-slip and anti-lock.

The ABS pump is located in the engine compartment near the firewall.

The braking system on the car is a very important part of the car, sometimes the ABS system on the car will fail, after the failure, the ABS indicator light will light up to remind the driver, when the anti-lock braking system fails, although the brake pedal of the car can continue to be used, but the braking effect of the car will deteriorate, the braking distance of the car will increase, and the control performance of the car will become worse when braking.

ABS on the car is used to improve the safety of the car, when the car encounters emergency braking during driving, it is easy to appear the phenomenon of wheel locking, after the wheel is locked, the friction between the car tire and the ground will decrease, if the front wheel of the car is locked, the direction of the car will be very difficult to control, if the rear wheel of the car is locked, the car will slide sideways in the process of braking.