Method for controlling spinning stroke of washing machine

Abstract

A method for controlling a spinning stroke of a washing machine is disclosed. The method for controlling a spinning stroke of a washing machine comprises steps of: judging a first value of the laundry amount based on a frequency of water re-supply counted in a rinsing stroke; measuring the time taken for a drum rotating before a spinning stroke to reach a preset speed once a rinsing stroke is completed; judging a second value of the laundry amount based on the measured time; determining a final value of the laundry amount based on the first and second value of the laundry amount; and starting a spinning stroke based on the spinning condition determined based on the final value of the laundry amount. An object of the present invention is to provide a method for controlling a spinning stroke of a washing machine, in which the laundry amount is sensed more accurately in a spinning stroke.

1 . A method for controlling a spinning stroke of a washing machine comprising steps of: 
 judging a first value of the laundry amount based on a frequency of water re-supply counted in a rinsing stroke;    measuring the time taken for a drum rotating before a spinning stroke to reach a preset speed once a rinsing stroke is completed;    judging a second value of the laundry amount based on the measured time;    determining a final value of the laundry amount based on the first and second value of the laundry amount; and    starting a spinning stroke based on the spinning condition determined based on the final value of the laundry amount.    
   
   
       2 . The method for controlling a spinning stroke of a washing machine of  claim 1 , wherein the frequency of water re-supply is counted while performing a first one rinsing stroke after a rinsing stroke starts in the step of judging a first value of the laundry amount based on the number of water re-supply accounted in a rinsing stroke.  
   
   
       3 . The method for controlling a spinning stroke of a washing machine of  claim 1 , wherein the step of judging a first value of the laundry amount based on the frequency of water re-supply counted in a rinsing stroke comprises, 
 an (a) step of supplying washing water to a preset first water level once a rinsing stroke starts,    a (b) step of rotating a drum leftward and rightward direction repeatedly once supplying water to the preset first water level is completed,    a (c) step of sensing a water level periodically while rotating a drum leftward and rightward direction,    a (d) step of re-supplying water to the preset first water level in case that the sensed water level is reduced lower than a preset second water level, and counting the frequency of water re-supply; and    a (e) step of judging a first amount of the laundry based on the frequency of water re-supply counted by repeating the (b)˜(d) steps after a rinsing stroke.    
   
   
       4 . The method for controlling a spinning stroke of a washing machine of  claim 1 , wherein the step of determining a final value of the laundry amount based on the first and second value of the laundry amount comprises steps of, 
 defining a criterion to judge a value of a first laundry amount by classifying the laundry amount into level I, II and III based on the frequency of water re-supply, and a criterion to judge a value of a second laundry amount by classifying the laundry amount into level A, B, C, D, E and F based on the time taken for a drum to reach a preset speed,    judging a first and second laundry amount based on the counted frequency of water re-supply and the time taken for the drum to reach a preset speed, and    determining a final value of the laundry amount corresponding to Chart 1 based on the first and second laundry amount judged by each criterion.                        CHART 1                             SECOND AMOUNT OF LAUNDRY                                       A   B   C   D   E   F                                                 FIRST   I   SINGLE   MINIMUM   MINIMUN   MINIMUM   MINIMUM   MAXIMUM     AMOUNT       PIECE     OF   II   MINIMUM   MINIMUM   SMALL   MIDIUM   LARGE   MAXIMUM     LAUNDRY   III   SMALL   SMALL   SMALL   MEDIUM   LARGE   MXIMUM     VALUE             (The laundry amount of I, II and III is I < II < III, and the laundry amount of A, B, C, D, E and F is A < B < C < D < E < F)                                                     
   
   
       5 . The method for controlling a spinning stroke of a washing machine of  claim 1 , wherein starting a spinning stroke based on the spinning condition determined based on the final value of the laundry amount comprises steps of, 
 determining acceleration gradient corresponding to the final value of the laundry amount after having defined each acceleration gradient based on the laundry amount, and    performing a spinning stroke by rotating the drum to a preset spinning speed based on the determined acceleration gradient.