Challenge

Week - 4

TASK : 1

Objective :

Implement control logic of a “washing machine” using Stateflow as per given sequence:

Aim :

To implement control logic of a “washing machine” on simulink models using Stateflow.

Simulink Model :

Washing Machine :

We have chart block in the center within which we will define states and releated conditions.
The inputs are given with constant block or any other block depending on the instance.Here we have power supply and water supply blocks as input to the chart block.
Power supply block and water supply block are connected to Rocker switch to control logic of ON/OFF respectively.
Output from the chart block are viewed from the display block ,depending on state transtions in chart block.
When one state is completed ,we have a Lamp block to display that the state is completed or not.
Within the chart block ,we have the different states with defined conditions. If the condition are satisfied ,the states are executed respectively.
Once all the states are executed , the output are obtained .

State-flow Chart :

State-flow sequence for washing machine :

If the power supply is available(1) ,the system gets activated.
If the water supply is available process continue's ,else stop the process and indicate through lamp LED.
Soaking time - 200 seconds.
Washing time - 100 seconds.
Rinsing time - 20 seconds.
Drying time - 50 seconds.
After all the processes have completed turn on the finished lamp LED.

Explanation :

The power supply and water supply are given as input to the washing machine .
In first state ,the inputs are checked. If there is no water supply or power supply ,further processes are not executed error is displayed.
Then soaking process starts ,soaking is done for 200 seconds.
After 200 seconds ,washing process starts ,washing is done for 100 seconds.
After 300 seconds , rinsing process starts , rinsing is done for 20 seconds.
After rinsing process ,drying process is done for 50 seconds.
Finally after drying process all the processes is completed ,the washing machine is ended.
This are indicated by the lamp LED when each of the processes is completed.

Output :

Result :

Washing Machine logic is built using state flow and given condition are executed respectively.

TASK : 2

Objective :

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 :

To implement simulink chart for the “Gear shift” on the given conditions.

Blocks Used :

1) Slider switch : This block toggles the value of the connected block parameter between two values during simulation.

2) Constant : constant value are added here.

3) Display : It is used display the final output of the function.

4) Stateflow-chart : It can be used as action language to implement control logic.

5) Lamp : Displays a color indicating the value of the input signal.

6) Slider Block : tunes the value of the connected block parameter during simulation.

7) Custom Gauge : Displays the value of the connected signal on a gauge face that you can customize to like a gauge in a real system.

Simulink Model :

StateFlow-Chart :

Explanation :

Assigning the parameters for the slider block is given below
The slider block is connected to a constant named "Vehicle Speed".
The stateflow chart is having two inputs which are speed and engine.
The speed input is connected with a constant named "Vehicle Speed" and engine input is connected with a constant block named "Ignition ON/OFF"
The "Ignition ON/OFF" constant block is connected to slider switch block.
In stateflow chart, checking ignition condition, we take "engine" as input giving the condition as "engine==0" ,this implies that vehicle is turned off .If condition is "engine==1", this implies that vehicle is turned on.
After the ignition condition is turned on the state flows to the next processes. Speed conditions are defined for each block.
When it exceeds the speed condition the process flows to the next block. All the conditions have been assigned to each block.
The stateflow chart has two outputs namely "gear" and "limit" these outputs are connected to the display blocks.
The "Current Gear"display block displays the exact gear at which the vehicle is running.
The "Over Speed"display block displays the condition when the vehicle is attaining overspeed situation. Lamp is connected to the block to turn on when overspeed is reached.