Patent ID: 8375495

Claim:
A control method of a laundry machine comprising a water supply cycle, a washing cycle and a rinsing cycle, the control method comprising: a first determination step performed prior to the rinsing cycle and determining a kind of detergent; a second determination step performed during a first rinsing course of the rinsing cycle and determining an amount of remained detergent in a rinsing water; a condition determination step of at least one following rinsing course based on the kind and amount of the remained detergent; a conductivity measuring step measuring conductivity of supplied water containing no detergent to compensate the conductivity of the rinsing water based on hardness of the supplied water, wherein the second determination step comprises: measuring conductivity of the rinsing water; and calculating the amount of the remained detergent based on the measured conductivity of the rinsing water, and wherein the conductivity measuring step measuring the conductivity of the supplied water containing no detergent comprises: measuring a first conductivity of the supplied water during the water supply cycle; measuring a second conductivity of the supplied water during a last rinsing course of the rinsing cycle; and storing an average value of the first and second conductivity if a difference between the first and second conductivity is below a preset value or deleting the measured first and second conductivity and re-using a conductivity value stored prior if the difference is over the preset value.