Week - 4

Q1. 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

Sol)

Washing Machine:

A washing machine is a machine used to wash various types of clothes without applying any physical effort. With a washing machine, you don’t have to rub the clothes with your hand or squeeze them to remove the water from them. The washing machine is also called a clothes washer or simply a washer. The washing machine enables you to wash your clothes automatically without having to supervise its operation. All you have to do is put the clothes in the machine and select the wash mode. The washing machine automatically takes in the amount of water and detergent required and it also automatically sets the timer for washing, rinsing, and drying as per the selected mode and the number of clothes.

Stages of washing machine:

Let us now undergo the stages of a washing machine which in turn helps you to understand better and pick the option depending on the basis of your need successfully.

• Prewash
• Washing
• Rinsing
• Spinning

• Prewashing

The option called prewash indicated filling the drum with a certain water level and mix up with the detergent powder. All this option helps to wash out all the stains including the stubborn or dirt very well from the clothes. This is possible as we soak the whole clothes placed into the drum. Finally, drain the water without making a second thought.

Taking the amount of water is different for both front load and top load washers respectively. In the front-load washing machines, it is all up to the settings done by the single user. Whereas at the top load washers, there are water level sensors for filling the drum at a certain level and clean the entire load getting rid of stubborn stains successfully.

• Washing

At this particular time, the machine uses agitation which is for mixing both water and detergent, in turn moving the clothes all around the drum. Generally, the top load washing machines come with an agitator or impeller placed at the center of the tub.

While coming to front-load washers, it depends upon the rotation of the entire tub provided for enhancing better wash and cleaning the load ultimately. Moreover, the duration taken to complete the wash cycle is depends upon the settings option chosen by the user. Always the heavy load enhances high duration. Small or limited load enhances less duration.

• Rinsing

The option called rinsing is known for the multi-talented option. During this particular cycle is on the flow, the soapy water taken from the clothes. And all the fresh or pure water is sparkled to the clothing available in the tub. This particular rinse option held responsible for taking soapy water out of the washer without facing any kind of difficulties. Finally, the agitation with plain water is considered the last step in the rinsing option.

• Spinning

Spinning is done to dry the entire clothes before getting to the end of the actual wash cycle. And these several washing machines are going to be spun at different speeds. In turn, the speed of one particular spin is calculated in revolutions per minute (rpm) respectively. This indicates the speed of the spin extracting the whole amount of water from the clothes making it dry very well.

These are the different cycles done by each model available in the Indian market. Accordingly, the machine coming with these factors enhances high performance. All the things one should aware of these options and must pick the right one at the right time. For any doubts, mention a single comment in the following rectangular section.

Component used in Washing Machine

• Constant
• State flow chart
• Lamps
• Display

Q2. 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.

Sol)

Gear shift

Gearshift or shifter more formally known as a transmission lever, is a metal lever attached to the transmission of an automobile. The term gear stick mostly refers to the shift lever of a manual transmission, while in an automatic transmission, a similar lever is known as a gear selector. A gear stick will normally be used to change gear whilst depressing the clutch pedal with the left foot to disengage the engine from the drivetrain and wheels. Automatic transmission vehicles, including hydraulic (torque converter) automatic transmissions, automated manual and older semi-automatic transmissions like VW Autostick, and those with continuously variable transmissions, do not require a physical clutch pedal.

*Taken by Encyclopedia

Component used :

• Constant
• State flow chart
• Display
• Lamps

Summery

As we can see the lamp is lit according to the gear it shows and the gear is at the current running according to the speed which we select by changing the constant .