MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung PDF herunterladen (Seite 55)

Build a Hybrid Model

2-33

Desired Relative Slip Block

The desired slip value is based on some physical modeling known as the mu-slip curve.

The mu-slip curve is the friction coefficient between the tire and the road surface, mu,

expressed as an empirical function of slip. The desired slip is set to the value of slip

at which the mu-slip curve reaches a peak value, this being the optimum value for

minimum braking distance. For more information about the mu-slip curve, see Modeling

an Anti-Lock Braking System.

Controller Subsystem

The ABS Controller subsystem contains a further subsystem that executes bang-bang

control, based upon the error between measured slip and desired slip. A bang-bang

controller is a type of feedback controller that switches between two states, based on the

sign of the error signal at its input. In this model, the output of the bang-bang controller

translates to an on/off rate that is supplied to the braking system.

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MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung Seite 55