Challenge

Week - 4

1) Implement control logic of a “washing machine” using Stateflow as per 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 next 20s & dryer runs for 50s

After all the processes have completed turn on the finished LED

Aim:

Procedure:

create a chart using the chart command .
Double click on the chart block to enter into the stateflow mode and create the state flow.
Drag the state blocks from the left pane and connect them according to the given sequence.
Add the required conditions after each stage for the process to happen.
The state flow for the above process will be as follows

From the above stateflow we can understand that the machine will work only if power supply and water supply is available.
If any of the above condition is false the machine will stop working.
If both the condition is true then the soaking process will be carried out for 200sec.
After soaking process Washing process will be done in 100sec
the rinsing will be carried out for 20 sec followed by drying for 50 sec, after which the process will be finisged.
Now go to the tools tab and select the model explorer option to assign the input and output variables as follows.

I have assigned Power & Water as input variables to know their status and S, W, R, D & F as output variables to represent the each stage such as soak, wash, Rinse, Dry & Finish respectively.
Now go back to the simulink window where you can see the whole state flow in a chart and the input and output variables assigned as well.
create two toggle switch ro give input to the constants for power supply On/Off & water supply On/off.
Display is connecte to each outputs to know the state of the process.
Lamps are coneected to the water supply input to check the water availability (green indicated water availability and red indicates the non availabiliy of water supply)
Second lamp is connwctd to the stop command in case of nthe non availability of water/ power supply. (Green indicates the condition for power and water is true and red indicates that the condition is false)
Third lamp is used to indicate that the process is finished/noy finisged (green lamp indicates the full process is finished & red lamp indicates that thae process is not finished)
change the simulation time to 500 sec and on the simulation tab click on the pacing option and change its value to 25
The Model will be as follows.

In the above model we can see that the power suplly is on, water is available so all our laps are turned green and output displays 1

In the above model we can see that the output diplays 0 as power supply is not available and the lamps indicate red as the process is not finished except the first lamp which indicates the water availability

In this case as all the condition is false the lamps indicate red colour and the output is displayed as 0

2) Make a Simulink chart for the “Gear shift” logic as per below conditions:

Speed Range(kmph) Gear

0 to 15 1

16 to 25 2

26 to 40 3

41 to 60 4

Above 61 5

Give speed input while the simulation is running & display the gear number.

Aim:

Explanation :

As per the above chart it is clear that we have assigned 5 gears with certain conditions at which spped each gear shouls get activated.
We can see that once the engine gets ignited and if the speed of the vehicle is >0 &<=15Gear 1 gets activated.
If the the speed is >=16 & <=25 gear gets shifted to gear 2
If the the speed is >=26 & <=40 gear gets shifted to gear 3
If the the speed is >=41 & <=60 gear gets shifted to gear 4
If the the speed is >=61 gear gets shifted to gear 5

Assign the input variables as engine & speed and output variable as gear level.
Now in the simulink window add a toggle switch for engine start stop function and a slider block which acts as an accelerator in our case.
The output can be connedted to as display to know the gear level.

In the above model we can see that as the speed is 1.36Km/hr our gear in the dispaly is 1
Now on changing the speed our gear changes accordingly.
Say for example our speed is around 46 our gear will be as follows

Ship work like this
in your own course.