Drainage and dewatering control method for self-cleaning washing machine

A drainage and dewatering control method for a self-cleaning washing machine, the washing machine including an inner tub and an outer tub and cleaning particles for cleaning an outer wall of the inner tub and an inner wall of the outer tub along with movement of a water flow, the cleaning particles arranged in a space located between the inner tub and the outer tub of the washing machine, the method comprising:

• receiving a drainage instruction, and opening a drainage valve;
• determining an amount of the cleaning particles per each unit volume of water in the space;
• controlling a rotating speed of the inner tub;
• regulating a frequency of friction and collision between the cleaning particles and the inner and outer tub walls;
• dividing drainage and dewatering processes of the washing machine into at least two control stages according to the amount of the cleaning particles per each unit volume of water in the space;
• and
• setting different rotating speeds of the inner tub in respective control stages of the at least two control stages, where a rotating speed of the inner tub is higher in the respective control stages than other respective control stages wherein the amount of the cleaning particles per each unit volume of water is larger.