Stable braking with EBS

Scania’s Electronic Brake System helps drivers obtain immediate, balanced and stable braking.

The funny thing about Scania’s state-of-the-art Electronic Brake System, EBS, is that for all of its sophisticated computer and sensor technology, it is mostly invisible to the driver.

“You don’t need to be an engineer to drive a truck,” says Sten Lundgren, Senior Technical Manager, Brakes. “Braking should be easy and simple, like in a car. And we want our drivers to concentrate on the road.”

EBS basically translates pressure on the brake pedal into an electronic signal that goes to an onboard computer located under the floor on the passenger side. This computer sends electronic signals to air valves and cylinders near every wheel to activate the disc brakes on the truck and trailer.

Integrated backup system

The result is an immediate, balanced and stable brake response that is superior to even the most sophisticated pneumatic arrangement. (For safety’s sake, all Scania trucks and buses have a pneumatic backup system integrated into EBS.)

“What drivers will notice is a substantial improvement in feel and response and savings on brake wear,” says Lundgren.

The EBS system was launched on Scania trucks in 1996, and since then many new functionalities have been added.

EBS gets real-time information on wheel-rotation speed from sensors in the wheels.

Ideally, speeds should be the same on all wheels. When they are not, such as on an icy road or during a skid, the Electronic Stability Programme (ESP), which is an optional  part of the EBS system, will react and try to correct the situation by braking wheels in the opposite direction of the skid to control the truck.


Functionalities

The Electronic Brake System enables a large number of functionalities, including anti-lock brakes (ABS), roll-over protection, a differential lock inhibitor, emergency brake assist, traction control, hill hold, brake temperature warning, brake lining wear monitoring, trailer coupling force control and brake blending.

With each of these, the brake management system monitors how fast the wheels are spinning or slipping, and when there are deviations, it corrects them. The goal is to get as low and even pad wear as possible and to use the retarder as much as possible.

“EBS does not take over the driver’s responsibility; it just provides additional support for the safe operation of a truck,” says Sten Lundgren, Senior Technical Manager, Brakes.