EBD, BAS and VSC systems. Principle of operation

EBD, BAS and VSC systems are types of vehicle braking systems. Each of them has its own advantages and disadvantages. When buying a car, pay attention to what kind of braking system you have. The functionality of each of them is different, respectively, a different system of work and design. The principle of operation differs in small subtleties.

Principle of operation and design of EBD

The name EBD can be understood as an electronic brake distributor. Translated from Russian means "electronic brake force distribution system." This system operates on a phase principle with four channels and ABS capability. This is its main software function with the addition. The additive allows the car to more efficiently distribute the brakes on the rims under conditions of maximum vehicle load. It also significantly improves handling and body responsiveness when stopping on different sections of the road. However, when an emergency stop is required, the basic principle of operation is the distribution of the center of mass on the vehicle. First, it begins to move towards the front of the car, then due to the new weight distribution, the load on the rear axle and the body itself is reduced. 

In cases where all braking forces cease to act on all, then the load on all wheels will be the same. As a result of such an event, the rear axle is blocked and becomes uncontrollable. Subsequently, there will be an incomplete loss of stability of the body while driving, changes are possible, as well as a small or complete loss of vehicle control. Another mandatory factor is the ability to adjust the braking forces when loading the car with passengers or other luggage. In a situation where braking occurs when cornering (in which case the center of gravity must be shifted towards the wheelbase) or when the wheels are moving on the surface with a different tractive effort, in this situation ABS alone may not be enough. Remember that it works separately with each wheel. The tasks of the system include: the degree of adhesion of each wheel to the surface, an increase or decrease in fluid pressure in the brakes and the effective distribution of forces (for each road section its own traction), stability and maintenance of synchronous control and a decrease in sliding speed. Or loss of control in the event of a sudden or normal stop.

The main elements of the system

The basic design brake force distribution system is created and built on the basis of the ABS system and consists of three main components: first, sensors. They can display all current data and speed indicators on all wheels individually. It also uses the ABS system. The second is an electronic control unit. Also included in the ABS system. This element can process the received speed data, predict all braking conditions and activate correct and incorrect valves and sensors of the brake system. The third is the last, this is a hydraulic unit. Allows you to regulate the pressure, creating the braking force required in a given situation when all wheels stop. The signals for the hydraulic unit are supplied by the electronic control unit.

Brake force distribution process

The operation of the entire electronic brake force distribution system occurs in a cycle approximately similar to the operation of ABS. Performs disc brake durability comparison and adhesion analysis. The front and rear wheels are controlled by a second adjuster. If the system does not cope with the tasks or exceeds the shutdown speed, then the EBD memory system is connected. The flaps can also be closed if they maintain a certain pressure in the rims. When the wheels are locked, the system can detect the indicators and lock them at the desired or appropriate level. The next function is to reduce the pressure when the valves are opened. The whole system can completely control the pressure. If these manipulations did not help and turned out to be ineffective, then the pressure on the working brake cylinders changes. If the wheel does not exceed the cornering speed and observes the limit, then the system should increase the pressure on the chain due to the open inlet valves of the system. These actions are carried out only when the driver applies the brake. In this case, the braking forces are constantly monitored and their efficiency is increased on each individual wheel. If there is cargo or passengers in the cabin, the forces will act evenly, without a strong displacement of the center of forces and gravity.

How Brake Assist works

Brake Assist System (BAS) improves the quality and performance of the brakes. This braking system is triggered by a matrix, namely by its signal. If the sensor detects a very rapid depression of the brake pedal, then the fastest possible braking begins. In this case, the amount of liquid increases to a maximum. But fluid pressure may be limited. Often, cars with ABS prevent wheelbase locking. Based on this, BAS creates a high amount of fluid in the brakes at the first stages of an emergency stop of the vehicle. Practice and tests have shown that the system helps to reduce the braking distance by 20 percent if you start braking at a speed of 100 km / h. In any case, this is definitely a positive side. In critical cases on the road, this 20 percent can radically change the outcome and save your or other people's lives.

How VSC works

A relatively new development called VSC. It contains all the best qualities of past and old models, refined small details and subtleties, corrected errors and shortcomings, there is an ABS function, an improved traction system, increased stability control and control during pull. The system was completely overhauled and did not want to repeat the shortcomings of every previous system. Even on difficult road sections, the brakes feel great and give confidence when driving. The VSC system, together with its sensors, can provide information about the transmission, brake pressure, engine operation, rotation speed for each of the wheels and other necessary information about the operation of the main systems of the car. After the data has been tracked, it is transmitted to the electronic control unit. The VSC microcomputer has its own small chips, which, after the information received, making a decision, assess the situation as correct as possible for the situation. Then it transfers these commands to the block of execution mechanisms. 

Also, this braking system can assist the driver in different situations. Ranging from emergency to insufficient driver experience. For example, consider the situation in a sharp turn. The car moves at high speed and starts to turn into a corner without preliminary braking. In cases of turning, the driver understands that he will not be able to turn as the car starts to skid. Pressing the brake pedal or turning the steering wheel in the opposite direction will only worsen this situation. But the system can easily help the driver in this situation. The VSC sensors, when the vehicle has lost control, transmit data to the execution mechanisms. They also do not allow the wheels to lock, then readjust the brakes on each of the wheels. These actions will help the car keep control and avoid turning around the axis.

Advantages and disadvantages

The most important and key advantage of the electronic brake force distributor is the maximum braking efficiency on any part of the road. And also the realization of the potential depending on external factors. The system does not require activation or deactivation by the driver. It is autonomous and works continuously every time the driver presses the brake pedal. Maintains stability and control during long corners and prevents skidding. 

As for the cons. The disadvantages of braking systems can be called an increased braking distance compared to the usual classic unfinished braking. When you are using winter tires, braking with the EBD or Brake Assist System. Drivers who have anti-lock braking systems face the same problem. Overall, EBD makes your ride safer and more reliable and is a good addition to other ABS systems. Together they make the brakes better and better.

Questions and answers:

How does EBD stand for? EBD - Electronic Brakeforce Distribution. This concept is translated as a system that distributes braking forces. Many cars with ABS are equipped with this system.

What is ABS with EBD function? This is an innovative generation of the ABS braking system. Unlike the classic ABS, the EBD function works not only during emergency braking, but distributes the braking forces, preventing the car from skidding or drifting.

What does the EBD error mean? Often such a signal appears when there is a poor contact on the dashboard connector. It is enough to press firmly on the wiring blocks. Otherwise, diagnose.