Week - 4

Objective: To implement the control logic of a “washing machine” using Stateflow as per the given sequence:

• 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 the next 20s & dryer runs for 50s

The Stateflow block and model of the washing machine logic are as follows.

Blocks used:

1. Constant: used to feed input values to the state flow.

2. Slider switch: used to vary the input of the state flow.

3. Display: Used to check the output of the Stateflow.

4. Lamp: Used to indicate the output of the Stateflow.

5.Stateflow: Defined states with required variables like power, water, soaking, washing, rinsing, drying, and process complete.

Explanation:

• the power and water supply to the Stateflow of the washing machine are varied on/off position with the slider switch.
• Stateflow is built to follow the given instructions.
• When there is no power Stateflow of the machine is not active. The machine will get activated only when the power is on.All indications are off.

• when power is on and the water tap is not on.The machine will indicate the no water supply with Red color lamp indication.

• When both the power and water supply are available. The Stateflow starts proceeding to the next stage in the flow. i.e soaking.

At simulation time of 20sec- the result is attached.

• After the Stateflow finishes, the machine will start washing for 100secs. the result at a simulation time of 210 secs is attached.

• Later, machine rinses 20secs, result at 330sec is attached.

• finally, drying will happen for 50secs. the result has been shown below.

• After drying the machine will indicate the process is complete.

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Objective: To Make a Stateflow for the “Gear shift” logic as per given conditions to display the gear number for the input speed,

Speed Range(kmph) Gear

0 to 15 1

16 to 25 2

26 to 40 3

41 to 60 4

Above 61 5

Blocks used:

1. Constant: used to feed the speed value to the Stateflow

2.Slider: used to change the speed during simulation time.

3. Speed gauge: used to represent the speed visually in a guage

4. Scope & display: used to check the results.

5. Stateflow: Defined states, variables, and conditions.

Model& Stateflow:

Explanation:

• If speed input is <15 then the gear remains in first gear. Later, if speed>15 then the gear shifts to 2nd gear.

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• if speed>25 shifted to 3rd gear,>40 4th gear, >60 5th gear.

• Stateflow works perfectly for the given conditions

Results: The slider changed during the simulation and the results are attached below. stateflow gear system is working well as per the given conditions.