Armin Czinczel

ANTISKID SYSTEM FOR PASSENGER CARS WITH A DIGITAL ELECTRONIC CONTROL UNIT

By introducing modern digital electronics, Bosch succeeded in developing a high-performance antiskid system for passenger cars. A digital design approach was chosen since it allows for a greater degree of integration than an analog design. This results in increased reliability. The hydraulic unit comprises three of four solenoid valves and a return pump driven by an electric motor. The system prevents vehicle swerving and maintains steerability while attaining remarkable gains in stopping distance at the same time. Therefore, the objective of the antiskid system (ABS) is to reduce the brake pressure in the individual wheel should excessive braking occur so that the wheels generate maximum brake force without locking; Thus vehicle steerability is maintained and vehicle swerving prevented. Simplified mechanical components and introduction of new technologies for the electronic control unit characterize the Bosch high-performance ABS system for passenger cars.

FOUR YEARS OF EXPERIENCE WITH 4-WHEEL ANTISKID BRAKE SYSTEMS (ABS)

Four years of experience with production line installed 4-wheel antiskid systems (ABS) in passenger cars were the motive for analyzing and evaluating the results and the experience gained. The performance, reliability and safety in case of malfunction are the most important reasons for the success of ABS. These points are dealt with and future improvements are outlined.