State flow model for Automatic Washing Machine & Gear Shifting Mechanism

Aim:

1. To implement control logic of a “washing machine” using State flow as per the inputs provided in power & water supply.
2. Make a Simulink chart for the “Gear shift” logic. Give speed input while the simulation is running & display the gear number.

Theory:

State-Flow: State-flow provides a graphical language that includes state transition diagrams, flow charts, state transition tables, and truth tables.

State-flow for Washing Machine:

Input Conditions: -

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

After all the processes have completed turn on the finished LED

Steps:

1. Create a chart in Simulink which satisfies all the above mentioned conditions.
2. Open the ‘Symbols panel’ and assign proper data. (i.e input or output).
3. Connect LED lamps to each process and set them accordingly.
4. Provide the output as a display.
5. In order to view the output we have provided display block and lamps.

Values 1 & 0 are given as input which switch ON and switch OFF the supply of power and water respectively.

State-flow for Gear Shifting:

Input Conditions: -

Speed Range (kmph) Gear

0 to 15 1

16 to 25 2

26 to 40 3

41 to 60 4

Above 61 5

Steps:

1. Create a chart in Simulink which satisfies all the above mentioned conditions.
2. Open the ‘Symbols panel’ and assign proper data. (i.e input or output).
3. Provide the output as a display and also provide a scope view the graph.

Output:

WASHING MACHINE MODEL: -

For Condition where Power=1 & Water=1

For Condition where Power=0 & Water=1

For Condition where Power=1 & Water=0

For Condition where Power=0 & Water=0

Input & Output ports:

GEAR SHIFT MODEL: -

For speed < 15 (Gear 1):

For speed < 25(Gear 2):

For speed < 40(Gear 3):

For speed < 60(Gear 4):

For speed > 60(Gear 5):

Input & Output ports:

Variation in Gear Shift:

CONCLUSION:

Thus we have successfully prepared a Simulink model for an automatic Washing Machine which can perform various operations if proper input is provided by the user.

Thus we have successfully prepared a Simulink model for a gear shifting mechanism which changes the gear for different ranges of speed.