Simulink Control Design™ - MathWorks

Enable zero-crossing detection

Enable zero-crossing detection to ensure that the software computes the linear system
characteristics at the following simulation times:

• The exact snapshot times, specified in Snapshot times on page 16-11.

As shown in the following figure, when zero-crossing detection is enabled, the

variable-step Simulink solver simulates the model at the snapshot time Tsnap. Tsnap may

lie between the simulation time steps Tn-1 and Tn which are automatically chosen by

the solver.

Computes linear system

characteristics at this time point

Tn-1 Tsnap Tn Time

• The exact times when an external trigger is detected, specified in Trigger type on
  page 16-12.

As shown in the following figure, when zero-crossing detection is enabled, the

variable-step Simulink solver simulates the model at the time, Ttrig, when the trigger

signal is detected. Ttrig may lie between the simulation time steps Tn-1 and Tn which

are automatically chosen by the solver.

Computes linear system

characteristics at this time point

Time

Amplitude

1

0

Tn-1 Ttrig Tn

Trigger signal

For more information on zero-crossing detection, see “Zero-Crossing Detection”
(Simulink) in the Simulink User Guide.

Settings

Default: On

Bode Plot