EWB (Electronic Wedge Brake)

Abbreviation EWB indicates a new type of disc brakes developed by Siemens VDO. Siemens VDO believes that the new wedge brake EWB will replace the existing hydraulic systems.

Abbreviation EWB English words originated from the Electronic Wedge Brake or electronic wedge brake. Siemens VDO presented the first functional model in 2005. Already the first tests showed that EWB has a much greater efficiency, shorter reaction times in comparison with the hydraulic brake is thus shorter stopping distances .

Principle:

Wedge brake itself is nothing new, V-brakes are already used for braking carriages. Siemens VDO engineers, this principle only re-used and perfected. Steel wedges are indentation between caliper and brake pads. Control elements of V works without hydraulic mechanisms only instant stepper motors. Each wheel has its own control unit. When brake pedal activates an electric motor, which pushes the plate with a caliper between the brake lining and disc. Turning the wheels, thanks to the friction force, the brake pad is pushed further to the disc. The faster the wheel spins, the more it increases the braking force on the blade. Therefore, EWB needs much less energy than current hydraulic systems.

1 - caliper, 2 - rotor, 3 - brake pads, 4 - electric motor, 5 - wedge mechanism

Thus arranged BBW brake system (brake-by-wire) to the brake by wire, allows braking of each wheel independently. Each wheel has its own control unit that can automatically regulate the braking force. BBW is replaced by the ABS and ESP . Disappears from the system hydraulics and power, the braking system is lighter. Especially in the wheel where the brake is one of the unsprung mass is a reduction in benefits. Great unsprung mass is negatively impacts on driving performance, comfort and durability.