Washing machine and foam sensing method thereof

摘要

A washing machine and a suds sensing method thereof, in which a generation of suds is precisely sensed using discharge characteristics of suds in a water discharging operation. The suds sensing method of a washing machine includes determining (S140) whether a water level reaches a water discharge completion level in a predetermined water discharging time (Tend) in a water discharging operation, determining whether the water level reaches a suds sensing level in a predetermined suds discharging time (Tpre) by controlling a drainage device (19) such that the drainage device is turned on and off when the water level does not reach the water discharge completion level in the predetermined water discharging time, and sensing the suds by controlling the drainage device (19) such that the drainage device is turned on and off in a predetermined range of the water level when the water level reaches the suds sensing level in the predetermined suds discharging time.