Week - 4

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

Aim

To implement a control logic of a washing machine using stateflow as per the following given sequence.

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

Procedure

• Creating a stateflow logic for washing machine using simulink with given informations.

Fig 1: Stateflow Logic of the system

Steps in creating the ststeflow logic

1. A Chart is Created.
2. Inisde the chart, different states of the systems are created as shown in the aove figure.
3. The entry and exit conditions has been assigned as per given details.
4. The delay of each state is initialised.

• Input and Output of the stateflow has been set.

Fig 2: Input and Outputs in Model Explorer

• The simulink Model has been created.

Fig 3: Simulink Model of the Washing Machine Syatem

Steps in designing the simulink model

1. Input to the stateflow chart is provided with Costant Blocks.
2. A Rotary Swich and Rocket Switch is used to Toggle ON and OFF Power and Water respectively.
3. Status of each state outputs are displayed using Display Blocks.
4. A Lamp is provided to visually analyse eash state.

Result

Each state output are given below y changing the run time.

Fig 4.1 : Power ON & Water OFF Fig 4.2 : Power ON & Water ON

Fig 4.3 : After 200 Sec Soaking Fig 4.4 : After 100 Sec Washiing

Fig 4.4 : After 20 Sec Rinsing Fig 4.6 : After 50 Sec Drying

After the process all the LED Lamps are in ON State.

#2 Design a imulink chart for the “Gear shift” logic

Aim

To 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

Procedure

• The stateflow model has been disgned.

Fig 1: Stateflow Logic of the Gear System

Steps in creating the ststeflow logic

1. A Chart is Created.
2. Inisde the chart, different states of the systems are created as shown in the above figure.
3. The entry and exit conditions has been assigned as per given details.
4. The speed range of each gear has been setup for each gear(State).

• The simulink Model has been created.

Fig 2: Simulink model of Automatic Gear System w.r.t Speed

Steps in designing the simulink model

1. Engine ON Input to the stateflow chart is provided with Costant Blocks.
2. After Engine is ON the speed input is fed with the help of Slider Gain Block.
3. Status of each state outputs (Gear) are displayed using Display Blocks.
4. A Lamp is provided to visually analyse which gear is currently in use.

Fig 3: Slider gain to adjust the speed input

Result

Each Gear is used with respect the speed input.

Fig 4.1: Gear = 1 Fig 4.2: Gear = 2

Fig 4.3: Gear = 3 Fig 4.4: Gear = 4

Fig 4.5 : Gear = 5

Speed has been changed & Gear is Displayed.