Leading wedge technology

Siemens

has unveiled a prototype automotive braking system based on the same principle used to slow down horse-drawn carriages a century ago.

The Electronic Wedge Brake (EWB) uses a wedge-shaped braking mechanism to bring a wheel to a standstill. The brake-by-wire system relies on advanced sensor technology and electronics to control the process and prevent the brakes from locking.

Siemens VDO Automotive claimed the EWB system — which emerged from technology developed in the aerospace sector — is more efficient, responds faster and requires 90 per cent less energy than conventional hydraulics.

Its improved efficiency means the unit can be smaller, cutting the vehicle’s weight and saving space while removing the need for brake lines, a servo-unit and a brake fluid reservoir. This will give car designers an extra 22 litres of space in the engine compartment, according to the German engineering giant.

Each wheel has its own control unit consisting of a brake pad, a mechanical transmission and two electric motors that allow precision control. There are also sensors to monitor movement and the forces produced during operation.