MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung PDF herunterladen (Seite 56)

2 Building Simple Models with SimEvents Software

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Brake System Dynamics Subsystem

The Brake System Dynamics subsystem is complex. What follows is a high-level

examination of how it works. For a more detailed analysis of a similar system, see

Modeling an Anti-Lock Braking System.

The Brake System Dynamics subsystem:

• Accepts a control signal from the ABS Controller subsystem, based on the error

between measured slip and desired slip.

• Delays the signal from the ABS Controller subsystem to model the delay associated

with the hydraulic lines of an actual braking system.

• Integrates the on/off rate supplied by the ABS Controller subsystem, to determine the

required braking pressure.

• Multiplies the brake pressure signal by the area and radius of the hydraulic braking

system piston, relative to the wheel, to determine the brake torque that is applied to

the wheel.

• Uses the calculated brake torque to calculate the wheel speed.

• Uses both the vehicle weight and the friction coefficient between the tire and the road

surface to determine the vehicle speed.

• Calculates the relative slip, based on the wheel speed, the vehicle speed, and the

minimum required stopping distance.

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MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung Seite 56