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1 Fuzzy Logic Control of Washing Machines Manish Agarwal Roll number 00ME1011 Department of Mechanical Engineering Indian Institute of Technology, Kharagpur - 721302, India E-mail: Abstract Washing machines are a common feature today in the Indian household. The most important utility a customer can derive from a washing machine is that he saves the effort he/she had to put in brushing, agitating and washing the cloth. Most of the people wouldn’t have noticed (but can reason out very well) that different type of cloth need different amount of washing time which depends directly on the type of dirt, amount of dirt, cloth quality etc. The washing machines that are used today (the one not using fuzzy logic control) serves all the purpose of washing, but which cloth needs what amount of agitation time is a business which has not been dealt with properly. In most of the cases either the user is compelled to give all the cloth same agitation or is provided with a restricted amount of control. The thing is that the washing machines used are not as automatic as they should be and can be. This paper aims at presenting the idea of controlling the washing time using fuzzy logic control. The paper describes the procedure that can be used to get a suitable washing time for different cloths. The process is based entirely on the principle of taking non-precise inputs from the sensors, subjecting them to fuzzy arithmetic and obtaining a crisp value of the washing time. It is quite clear from the paper itself that this method can be used in practice to further automate the washing machines. Never the less, this method, though with much larger number of input parameters and further complex situations, is being used by the giants like LG and Samsung. Problem Definition When one uses a washing machine, the person generally select the length of wash time

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