When one uses a washing machine, the person generally select the length of washing time

based on the amount of clothes he$/$she wish to wash and the type and degree of dirt cloths have.

To automate this process, a fuzzy logic controller is designed using sensors to detect these

parameters and the washing time is then determined from this data. The input variables are

degree$-$of$-$dirt $($DD$)$ and type$-$of$-$dirt $($TD$)$; the output variable is washing$-$time $($WT$).$ The fuzzy sets

for input and output variables are as follows:

degree$-$of$-$dirt$($DD$)$:$\{$Small$,$ Medium, Large$\},$

type$-$of$-$dirt$($TD$)$:$\{$VeryNotGreasy$,$ NotGreasy, Medium, Greasy, VeryGreasy$\},$ washing$-$time$($WT$)$:

$\{$VeryShort$,$ Short, Medium, Long, VeryLong, High$\}.$

For inputs, Trapezoidal membership functions are shown below