Positive flow control method and system of the excavator shovel and

The present invention discloses one kind of positive flow control method and system of the excavator and the shovel, the method comprising: collecting each of the pilot pressure sensor; theoretical displacement volume of the pump before a left travel, boom lifting, lowering the boom, the arm excavating, unloading arm, and bucket digging bucket unloading the maximum demand of the displacement, the pump displacement of the theoretical output right travel, swivel, lift the boom, arm crowding, the arm and bucket digging unloading after a small displacement of the output value V11 of the front pump and V1' are V12, V21, and the smaller value V2'; maximum displacement in the demands; each master pressure sensor receiving pressure collecting, calculating and V1' V2' V22 output displacement pump; calculated before displacement of the pump the actual output, the actual output of the pump displacement; determining a first electromagnetic proportional valve current, the second solenoid proportional valve current. The present invention takes a positive control the flow cross-power mode control, a reasonable allocation of before, after absorption of the pump power, the engine can be controlled effectively hold back the car.