Week - 4

AIM:

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

2. Make a Simulink chart for the “Gear shift” logic as per given conditions.

THEORY:

STATE FLOW: Stateflow is a graphical environment that allows you to design and simulate decision logic for supervisor control, task scheduling, and fault management applications. Stateflow is a control logic tool used to model reactive systems via state machines and flow charts within a Simulink model.

CONTROL LOGIC: Control logic is a key part of a software program that controls the operations of the program. It is the part of a controller that defines how a reactive system responds to events or conditional changes.

1. Washing Machine Logic:

• 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

SIMULINK BLOCK DIAGRAM:

EXPLANATION OF THE BLOCKS:

• Initially a chart is created and different states are defined as per the given instructions in the problem.
• 
• Delay timings are given as per the values in the instructions.
• Respective variables are created and input & output ports are assigned.
• Power and Water Supply are connected to the input ports of the Chart. The output ports are connected to the display and the lamp for getting a visual output.
• The Simulation runs for 360 sec.

OUTPUT:

Case-1: When Power Supply is turned OFF (input = 0)

All the remaining processes are not performed as the Power Supply is 0.

Case-2: When Water Supply is OFF (input = 0)

Case-3: When both Power and Water Supply is turned ON (input = 1)

The processes complete in 360s and all the lamps get illuminated.

2. Gear Transmission Logic:

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.

SIMULINK BLOCK DIAGRAM:

EXPLANATION OF THE BLOCKS:

• Initially a chart is created and various gear states are formed inside the chart.
• 
• The speed constraints are defined as per the given instructions.
• then the Power Key and a Slider Gain Speed is connected to the input of the Chart.
• The Output is connected to a display which shows the Gear Output value.
• The Lamp is connected with the Key which is Red when Key = 0 (OFF) and turns Green when Kry = 1 (ON).

OUTPUT:

The Gear value changes in real time as per the given Speed values. The Speed can be varied by varying the Slider Gain as shown below:

CONCLUSION:

Hence both the Washing Machine as well as Gear transmission logics are implemented using charts and the output results are attached as above.