Brakes, Brake Control and Driver Assistance Systems: by Konrad Reif

By Konrad Reif

Braking structures were consistently built and enhanced through the final years. significant milestones have been the creation of antilock braking method (ABS) and digital balance software. This reference publication presents an in depth description of braking elements and the way they have interaction in digital braking systems.

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Additional info for Brakes, Brake Control and Driver Assistance Systems: Function, Regulation and Components

Example text

Braking factor The braking factor, Z, is the ratio between total braking force, Ff, and total static weight, GS, (vehicle weight) acting on the axle or axles of the vehicle. 81 m/s2). 1 Vehicle braking sequence to the point of standstill (ideal case) υ0 s0 1 2 3 a mft 4 5 t0 t1 t2 t3 t4 t5 t6 Time t7 æ UFB0720E Total braking time The braking time, tb, is the time that elapses from the point at which force is first applied to the actuation device to the point at which braking force ceases (t7 – t0).

8) to a pressure of 36 ... 57 bar. When its shut-off pressure is reached, the changeover valve (5) connects the spring chamber of the flow-regulator piston (4) to the hydraulic reservoir via port B. The entire hydraulic flow is then available to the power-steering system. Function Hydraulic brake servo units amplify the force applied to the brake pedal by the driver when braking. They use hydraulic power that is generated by a hydraulic pump and stored in a hydraulic accumulator. Design The hydraulic brake servo system consists of the following components: ¼ Steering pump (1) ¼ Reservoir (2) with filter ¼ Pressure-controlled flow regulator (3) with hydraulic accumulator (4) ¼ Master cylinder (5) with brake-fluid reservoir (6) The steering pump supplies the brake servo unit (7) and the power steering system (8) with hydraulic pressure.

Brake fluid acts as the transmission medium between the master cylinder and the brakes (Figure 1). Overview On power-assisted braking systems such as are most frequently used on cars and light commercial vehicles, the actuation pressure is amplified by a brake servo unit (brake booster). Car braking systems must perform the following fundamental tasks: ¼ Reduce the speed of the vehicle ¼ Bring the vehicle to a halt ¼ Prevent unwanted acceleration during downhill driving ¼ Keep the vehicle stationary when it is stopped Example of a power-assisted car braking system 12 Fig.

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