Control method and system used for excavator electric control pump

Abstract

The invention discloses a control method and system used for an excavator electric control pump. The control method used for the excavator electric control pump comprises the steps of calculating the current of front and rear pumps according to the pilot pressure value of each action; jointly calculating stall torque according to the pilot current value, the front and rear pump pressure and the stall value of the specific rotating speed of an engine; calculating the exceeding magnitude of the torque by taking the difference value between the calculated stall torque and the given torque of each gear of the engine and the differential of the difference value as fuzzy control input; carrying out fuzzy computing to distribute the reduced amount of the torque of the front and rear pumps according to the magnitude of the front and rear pump main pressure; enabling the sum of the reduced amount of the pilot expected torque of the two pumps to equal to the exceeding magnitude of the torque; calculating and outputting the magnitude of the current of the two pumps according to the deserved torque of the two pumps and the magnetite of the main pressure which are obtained by calculation. According to the control method and the control system used for the excavator electric pump, on basis of fuzzy control, the working performance of an excavator adopting the electric control pump is further improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a control method and system for an excavator electric control pump. Background technique [0002] Compared with hydraulically controlled pumps, electronically controlled pumps can achieve faster response speed and have the advantages of convenient adjustment, so effectively controlled electronically controlled pumps can achieve a perfect match between working conditions and engine performance during the working process of excavators. However, compared with hydraulic signals, electrical signals are more susceptible to external interference, and are prone to control instability, resulting in movement jitter during excavator work. Therefore, the goal of high-performance work of excavators using electronically controlled pumps is greatly dependent on the control algorithm of electronically controlled pump current. [0003] In other words, the use of electronically controlled pum...

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Problems solved by technology

[0005] Moreover, according to the analysis of the characteristics of the hydraulic system under high pressure conditions, when the excavator is working under heavy load conditions, the overall rigidity of the system is greatly improved. At this time, the natural frequency of the hydraulic system composed of valve-controlled hydraulic cylinders increases with the load. This will affect the dynamic stability of the excavator's overall movement, which will reduce the overall performance of the excavator. The specific performance is that the engine smoke is large, some actions cannot achieve full power output, low efficiency, high fuel consumption, Problems such as walking vibration when going uphill, swinging vibration when the boom is raised under heavy load conditions, a sharp decrease in the rotation speed when the bucket is under pressure, and vibration when the bucket is lifted and the bucket is under pressure, etc.

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