When the defrost state is active, the controller turns off the recycling air. To facilitate effective window defrosting, the controller implements an internal transition within these two states. Two switches trigger the Stateflow charts that control the Air Distribution( AirDist) and Recycling Air ( Recyc_Air) states. When the air temperature in the car is within 0.5 deg C of the setpoint temperature, the system switches off. This ensures that the temperature reaches the required value in a reasonable amount of time, despite the temperature difference. In the Blower state, the greater the difference between the setpoint temperature and the current temperature, the harder the fan blows. To avoid continuously switching on and off the heater, the logic implements a dead band of 0.5 deg
It stays active until the air temperature in the car is within 0.5 deg C of the setpoint temperature. They’ve also included the SISO (single-input single-output) tool, a GUI that allows for interactive system analysis and control design. Similarly, when you enter a setpoint that is 0.5 deg C or less than the current car temperature, the air conditioner turns on. In our case, MATLAB has included the Control Systems Toolbox which includes several functions tailored for control systems engineering. The heater remains active until the current temperature in the car is within 0.5 deg of the setpoint temperature. The Heater_AC state shows that entering a setpoint temperature that is greater than the current car temperature by at least 0.5 deg C switches the heater system on.
To see the control logic, open the chart. Modeling Stick-Slip Friction sfstickslip. Electrohydraulic Servo Control sfelectrohydraulic.mdl IX. Automatic Transmission Control sfcar.mdl VIII. Fault-Tolerant Fuel Control System fuelsys.mdl VII. Stateflow implements the supervisory controller. The following applications and models use Simulink enhanced with Stateflow: VI.
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