Control logic of a “washing machine” using Stateflow and “Gear shift”

Aim:

1. Implement control logic of a “washing machine” using Stateflow.
2. Make a Simulink chart for the “Gear shift” logic.

Software used:

MATLAB R2020a_Simulink

Theory:

1. Given conditions for "washing machine" Stateflow:

• If the power supply is available, the system gets activated.
• If the Water supply is not available, stop the process & indicate through the LED.
• Soaking time should be 200s followed by Washing time of 100s.
• Then rinsing happens for the next 20s & dryer runs for 50s

Washing Machine Stateflow chart:

Procedure:

• Initially, the Inputs, power & water supply are connected to the chart, through slider switches by initiating constant values 0 and 1 as a condition for ON and OFF.
• In the chart, the flow process is initiated as per the given conditions.

Flow_1: Power & Water supply - checking water supply(If power is ON) - Filling water(If the water supply is ON) - Soaking - Washing - Rensing - Drying - Finish.

Flow_2: Power & Water supply - checking water supply(If power is ON) - No_water(If water supply if OFF) - Finish.

By using junction box will repeat the process after Finish/End

• The outputs are specified as Fill water(FW), Soaking(A), Washing(B), Rensing(C), Drying(D), Finish(E) and displayed the condition and LEDs.
• If the condition is satisfied the LEDs show a "Green" color, else a "Red" color.

Stateflow process:

• When the only power source is ON & the water supply is OFF.

If the water supply is OFF the flow will get terminates after checking the water supply and then the process gets END.

1 2

3

• When the both Power and water supply is ON

1 2

3 4

5 6

worksheet:

2. Given conditions to make a Simulink chart for the "Gear Shfit"

Speed Range(kmph) Gear No.

0 to 15 1

16 to 25 2

26 to 40 3

41 to 60 4

Above 61 5

Gear Shift chart:

• When the speed is at 35KMPH

• When the speed is at 84KMPH

worksheet:

Blocks used:

constant: To input to slider gain

Slider gain: To change the speed of the vehicle

Chart: To create Gear shift flow

Display: To view the gear number.

Flow process:

Constant - Slider gain - Gear shift chart (Gear1, Gear2, Gear3, Gear4, Gear5) - Gear Number.

By changing the speed in the slider gain the gear number changes by following the flow process defined in the chart.

Conclusion:

Hence,

• Implemented the control logic of a “washing machine” using Stateflow.
• Created a Simulink chart for the “Gear shift” logic.