Electronic brakeforce distribution

Electronic brakeforce distribution

Electronic brakeforce distribution or EBD is an automobile brake technology that automatically varies the amount of force applied to each of a vehicle's brakes, based on road conditions, speed, loading, etc. Always coupled with anti-lock braking systems, EBD can apply more or less braking pressure to each wheel in order to maximize stopping power whilst maintaining vehicular control.

How ABS works

When a rotating wheel is subjected to excessive heavy braking, it is prone to lock-up. In motor vehicles, the anti-lock braking system (ABS) works to prevent this by monitoring wheel speeds and taking action in the form of releasing pressure on the braking circuit, when a rapid deceleration occurs in any of the wheels to ensure steering and vehicular control is maintained during heavy or emergency braking. Modern ABS has four separate channels - one for each tire - as different amounts of braking pressure are required to lock a rotating wheel on different surfaces. For example, less braking pressure would be needed to lock a wheel which was in contact with ice than a wheel which was in contact with an asphalt road.

In a situation where the wheels of a vehicle are on different surfaces (for example the two left wheels are on a concrete road and the two right wheels were on snow), during an emergency stop ABS would detect the two right wheels about to lock and would activate. Less braking force is sent to the right wheels, which would otherwise lock and not slow the car down.

How EBFD works

As per SAE technical paper #920646 - Buschmann et al."The job of the EBD as a subsystem of the ABS system is to control the effective adhesion utilization by the rear wheels. The pressure of the rear wheels is approximated to the ideal brake force distribution in a partial braking operation. To do so, the conventional brake design is modified in the direction of rear axle overbraking, and the components of the ABS are used. EBD reduces the strain on the hydraulic brake force proportioning valve in the vehicle. EBD optimizes the brake design with regard to: adhesion utilization; driving stability; wear; temperature stress; and pedal force."

EBFD works in conjunction with ABS to minimize yaw accelerations during turns. It compares steering wheel angle to a yaw sensor. "Yaw" is the vehicle's rotation about its center of gravity (imagine a car spinning out of control). If the yaw sensor detects more/less yaw than the steering wheel angle should create - the car is understeering or oversteering - EBFD activates one of the rear brakes to rotate the car back into its intended course. The sensors are so sensitive, and the actuation is so quick that the driver doesn't notice it working - or how close he/she was to spinning out and hitting something!

For example, if a car is making a left turn, and begins to understeer (the car veers to the outside of the turn) EBFD activates the left rear brake, which will turn the car and make the car point left.

ee also

*Cornering Brake Control
*Automobile safety

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Distribution — Contents 1 In mathematics, science, and technology 1.1 In mathematics 1.2 In science …   Wikipedia

  • Holden VZ Commodore — For a complete overview of all Commodore models, see Holden Commodore. Holden VZ Commodore Manufacturer Holden Also called Holden VZ Berlina Holden …   Wikipedia

  • Anti-lock braking system — An anti lock braking system (ABS, from German: Antiblockiersystem) is a safety system that allows the wheels on a motor vehicle to continue interacting tractively with the road surface as directed by driver steering inputs while braking,… …   Wikipedia

  • Audi RS6 — Infobox Automobile name = Audi RS6 quattro manufacturer = quattro GmbH (a private subsidiary of Audi AG) parent company = Volkswagen Group (Volkswagen AG) production = C5: 2002 2004 C6: 2008 present assembly = Neckarsulm, Germany predecessor =… …   Wikipedia

  • Audi S4 — Infobox Automobile name = Audi S4 manufacturer = Audi AG parent company = Volkswagen Group (Volkswagen AG) aka = S4, S4 quattro production = 1991 present assembly = Ingolstadt, Germany class = Compact executive car, Sports car layout = Front… …   Wikipedia

  • Audi S8 — Infobox Automobile name = Audi S8 quattro manufacturer = Audi AG parent company = Volkswagen Group (Volkswagen AG) production = 1998 ndash;present assembly = Neckarsulm, Germany class = Large luxury executive car, sports car body style = 4 door… …   Wikipedia

  • Audi S6 — Infobox Automobile name = Audi S6 manufacturer = Audi AG parent company = Volkswagen Group (Volkswagen AG) production = 1994 present assembly = Neckarsulm, Germany class = Luxury executive car, Sports car body style = 4 door saloon/sedan, 5 door… …   Wikipedia

  • Disc brake — Close up of a disc brake on a car On automobiles, disc brakes are often located with …   Wikipedia

  • Mitsubishi AWC — All Wheel Control (AWC) is the brand name of a four wheel drive system developed by Mitsubishi Motors.[1] The system was first incorporated in the 2001 Lancer Evolution VII.[2] Subsequent developments have led to S AWC (Super All Wheel Control),… …   Wikipedia

  • Semi-automatic transmission — Transmission types Manual Sequential manual Non synchronous Preselector Automatic Manumatic Semi automatic Electrohydraulic …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”