Patent ID: 7484258

Claim:
A method for detecting a laundry weight of a washing machine comprising: converting a mode of a washing machine into a dewatering mode, driving a motor of the washing machine sequentially at a first speed and at a second speed for a preset time and detecting a first current for driving the motor at the first speed and a second current for driving the motor at the second speed; outputting a first current by filtering each detected current through a first low pass filter; outputting a second current by filtering each detected current through a second low pass filter, wherein the first current is a first speed current value obtained by passing a current for driving the motor at the first speed through the first low pass filter and a second speed current value obtained by passing a current for driving the motor at the second speed through the first low pass filter; calculating a maximum value and a minimum value of an eccentricity current to be used to calculate a compensation value of an amount of eccentricity of the drum of the washing machine on the basis of values of the first current and the second current; calculating a maximum value and a minimum value of a laundry weight current to be used to calculate a laundry weight value prior to compensation of the amount of the eccentricity on the basis of the first current; calculating a first current amplitude on the basis of a maximum value and a minimum value of the eccentricity current and calculating a second current amplitude on the basis of a maximum value and a minimum value of the laundry weight current; and detecting a final laundry weight on the basis of a predetermined compensation value of the amount of eccentricity, which corresponds to the first current amplitude and a predetermined laundry weight value corresponding to the second current amplitude.