application of fuzzy logic in washing machine

7/27/2019 Application of Fuzzy Logic in Washing Machine

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SUBMITTED BY

NIMISHA PAULOSE

MTECH CSE 1ST YEAR

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INTRODUCTIONWhen one uses a washing machine, the person

generally select the length of wash time based on theamount of clothes he/she wish to wash and the typeand degree of dirt cloths have.

We use sensors to detect these parameters (i.e. volumeof clothes, degree and type of dirt). The wash time is

then determined from this data.

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PROBLEM DEFINITION fuzzy logic controlled washing machine controller

gives the correct wash time even though a precisemodel of the input/output relationship is notavailable.

There are two inputs are:

1. Degree of dirt

2. Type of dirt

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Basic block diagram of the process

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Membership function for dirtness_of_clothes

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Membership Function of type_of_dirt

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The sets of rules used here to derive the output are:

1. If dirtness_of_clothes is Large and type_of_dirt isGreasy then wash_time is VeryLong;

2. If dirtness_of_clothes is Medium and type_of_dirt is

Greasy then wash_time is Long;3. If dirtness_of_clothes is Small and type_of_dirt is

Greasy then wash_time is Long;

4 . If dirtness_of_clothes is Large and type_of_dirt isMedium then wash_time is Long;

5. If dirtness_of_clothes is Medium and type_of_dirt isMedium then wash_time is Medium;

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6. If dirtness_of_clothes is Small and type_of_dirt is Medium

then wash_time is Medium;7. If dirtness_of_clothes is Large and type_of_dirt is NotGreasy

then wash_time is Medium;

8. If dirtness_of_clothes is Medium and type_of_dirt isNotGreasy then wash_time is Short;

9. If dirtness_of_clothes is Small and type_of_dirt is NotGreasythen wash_time is VeryShort

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The two input parameters after being read from the

sensors are fuzzified as per the membership functionof the respective variables.

These in additions with the membership functioncurve are utilized to come to a solution (using some

criteria). At last the crisp value of the wash_time isobtained as an answer.

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membership functions for output variable wash_time

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Input/Output response surfaces

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CONCLUSION

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Using fuzzy logic ,situation analysis ability has beenincorporated in the machine which makes the machinemuch more automatic.

The results (the above plot) shows the way the machinewill response in different conditions.

For example, if we take type_of_dirt and direness valueboth to be 100, the wash_time which the model output is

equivalent to 60 minutes. This is quite convincing andappropriate.


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By the use of fuzzy logic control we have been able toobtain a wash time for different type of dirt anddifferent degree of dirt.

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application of fuzzy logic in washing machine

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