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Robert Bosch has introduced an electrohydraulic brake system that is a major step toward electronic brake-by-wire. The system translates the pressure of a driver's foot on the brake pedal into electrical signals that control a central hydraulic unit. There is a backup hydraulic system should the electrical system fail.
The new system differs from conventional servohydraulic systems in that the electronic brake management system computes the brake forces required on the individual wheels independently of driver input. That allows better control of braking and easier integration of the braking systems with traction and control systems.
According to Bosch, the system allows for short braking times by compensating for a decreasing braking effect by automatically increasing the brake forces. The brake pedal does not pulse and is quiet.
Bosch's system is expected to be fitted on a DaimlerChrysler model in 2001.
Bosch says the electrohydraulic brake unit weighs less than conventional brake systems, requires a smaller installation space and does not need a brake booster. It is easier to fit, and the number of variants is much reduced.
Most importantly, the system is more reliable than conventional brake systems, Bosch says.
The electrohydraulic brake system is easily networked with other vehicle systems and therefore is a good basis for next-generation adaptive cruise control or for input from traffic navigation systems.