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What is meant by EBD and Break Assist

Published On : 2016-09-23 12:11:13.0 Riju
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Brake assist is an active vehicle safety feature designed to help drivers come to a stop more quickly during an episode of emergency braking. Studies show that when making emergency stops, about half of all drivers do not press the brake fast enough or hard enough to make full use of their vehicle's braking power. Brake assist is designed to recognize the tell-tale signs of emergency braking and provide drivers with extra brake support.

Brake assist is called by other names including Emergency Brake Assist (EBA) and Predictive Brake Assist (PBA). The different names are significant because though all brake assist systems have the same purpose, some are designed differently.

Brake assist is useful whenever drivers must brake hard to make an emergency stop. Brake assist usually works in combination with anti-lock braking systems (ABS) to help make braking as effective as possible while avoiding wheel lockage. 

Electronic brake assist systems use an electronic control unit (ECU) that compares instances of braking to pre-set thresholds. If a driver pushes the brake down hard enough and fast enough to surpass this threshold, the ECU will determine that there is an emergency and boosts braking power. Many of these systems are adaptable, which means they will compile information about a driver’s particular braking style and tweak the thresholds to ensure the highest accuracy in emergency-situation detection.

Most of the cars today come fitted with ABS or Anti-lock Braking system. Coupled along with ABS, there is another electronic marvel called the EBD or Electronic Brakeforce Distribution. Simply put, EBD is a system wherein the amount of braking force on each wheel of the car can be varied taking factors such as load bearing on each wheel, condition of the road, speed of the vehicle and so on.

How does it work?

The simple idea behind an EBD system is that it need not be necessary to apply the same amount of braking force on each wheel so as to reduce the speed of the car or bring it to a complete stop. An EBD system makes use of three components which make it tick. The speed sensors, brake force modulators and electronic control unit (ECU).

1. Speed Sensor: The speed sensor not only calculates the speed of the car, but the speed of the engine also (RPM). One of the scenarios can be that the speed of the wheel might not be the same as the speed of the car. Such a situation can lead to the wheel(s) skidding. The speed sensors calculate the slip ratio and relay it to ECU.

2. Electronic Control Unit: It is a small chip which collects the data from the speed sensors in each wheel and uses the data to calculate the slip ratio (difference between the speed of the car and the rotation of the tyre). Once the slip ratio is determined, it makes use of the brake force modulators to keep the slip ratio within limits.

3. Brake Force Modulators: It is the job of these modulators to pump brake fluid into the brake lines and activate the brake cylinders. The brake force applied on each wheel can be modulated.

CarDekho on 2016-09-23 12:35:10.0
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