Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

Modeling An Intersection Of Two 1-way Streets Using Stateflow®

This example models an intersection of two 1-way roads controlled by a Stateflow® traffic light system. The Stateflow® chart uses active state outputs and a mask. The behavior of the traffic lights is controlled by parameters on the Stateflow® mask.

Intersection Model

The phase of the animated traffic lights is determined by the output data from the Stateflow® chart. The value of the output data corresponds to the active child of "Light1Controller" and "Light2Controller," respectively.

Traffic Controller

The Stateflow® chart ''Traffic Controller'' manages two traffic controllers in parallel. Each controller determines the phase of the downstream traffic light based on traffic congestion at the intersection, an input from Simulink®, and parameters on the chart's mask.

Active State Output

The child activity of both "Light1Controller" and "Light2Controller" is output to Simulink® via a data of enumerated type. This data is automatically managed by Stateflow®.

  • Open one of the Light controllers (for instance, Light1Controller).

  • Right click and select Properties.

  • Notice the "Create data for monitoring child activity" is selected.

  • The field "Data name" corresponds to the name of the output data on the linked instance.

  • This output is mapped to a chart level output called "Light1".

Simulation

Simulate the model to see the traffic light blocks animate.

Was this topic helpful?