Washing machine for auto-added washing agent by negative pressure and controlling method thereof

A washing machine comprising:

• a water inlet, a detergent container and a tub,
• wherein, two water inflowing water passages which are respectively a main inflow waterway and a rinse waterway are set between the water inlet and the tub,
• a dosing container which communicates with the detergent container is arranged between the rinse waterway and the tub,
• a venturi tube by which a negative pressure is generated during passage of a water stream is arranged in the main inflow waterway,
• a branch pipe which communicates with the dosing container is arranged at the rear side of the outlet of the venturi tube, and
• the detergent in the detergent container is pumped into the dosing container by the negative pressure generated during feeding water from the main inflow waterway into the tub, and then is diluted and supplied into the tub by the inflowing water from the rinse waterway to the dosing container, wherein,
• a main inlet valve is arranged between the main inflow waterway and the water inlet,
• a rinse water valve is arranged between the rinse waterway and the water inlet,
• a wash control valve is set between the rinse water valve and the dosing container,
• a sealing control valve for sealing a connection is arranged at the connection between the dosing container and the branch pipe, and
• a water intake control valve is arranged between the dosing container and the tub.