The Automotive Chassis by Giancarlo Genta & Lorenzo Morello

Author:Giancarlo Genta & Lorenzo Morello
Language: eng
Format: epub
ISBN: 9783030356354
Publisher: Springer International Publishing

On Fig. 5.20, at left the transient response (quick braking force application) and the quasi steady response (slow braking force application) are shown, for a vacuum power brake; the input variable is the force on the pedal, the output variable is the pressure in the circuit. By a quick force application the pressure in the circuit is lower as that obtained by slow application and this difference is decreasing only after a certain time lag.

In general, this behavior is perceived by the driver as a pedal force increase as it usually happens when the engine is switched off.

Master Cylinder

The effect of master cylinder is generally negligible, if compared with the rest of the system, because masses are small and cylinder walls are very stiff.

Piping

It is possible to analyze the behavior of tubes of the braking system with equations describing the longitudinal vibrations of the fluid in the ducts.

For small diameter tubes, the effect of viscosity is predominant.

A good correlation between calculated and experimental data can be obtained with a simple model, where a rod, representing the fluid, set in series with a spring, representing the system elasticity, receives, as input, a force pulse at one end.

Brakes

The dynamic behavior of a brake (either disc or drum brake) should be analyzed by different models, considering the following behaviors:thermal behavior, where the brake is considered as a device to convert kinetic energy into heat, to be wasted into the ambient;

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