Hydraulic energy-saving device of engineering plant, control method and excavator

Abstract

The invention discloses a hydraulic energy-saving device of an engineering plant, a control method and an excavator and belongs to the technical field of energy conservation of the engineering plant. The hydraulic energy-saving device of the engineering plant comprises a power control proportional valve, a controller and an information collection module; and the power control proportional valve and the information collection module are respectively connected with the controller. The control method comprises the following steps: setting current of each gear of power valve when the excavator normally works, setting a corresponding percentage current value through percentage; carrying out PID (proportion-integral-derivative) control by the controller to obtain a control target value, and controlling the power valve by the controller according to the control target value and the feedback value of actual current. The current relation of the power valve is correspondingly controlled through the percentage; the current value of the power valve can be flexibly controlled; and the utilization rate of the power of an engine is greatly improved, so as to achieve the purpose of saving energy. The stall phenomenon can be effectively reduced; the hydraulic pressure is prevented from being suddenly loaded and the engine is prevented from being cut off at the same time when high-gear idle speed occurs.

Description

technical field [0001] The invention relates to the technical field of engineering machinery energy saving, in particular to an engineering machinery hydraulic energy saving device, a control method and an excavator. Background technique [0002] The fuel utilization rate of construction machinery products is usually low, especially for hydraulic excavators. About 20% of the output power of the engine can be converted into useful work, of which about 40% is lost in hydraulic components, and about 20% is lost in the body and work. About 20% of the movement of the device is lost in throttling speed control. In hydraulic excavators above 30T, the negative flow pump is mainly used for power output, and the control of the negative flow pump is mainly adjusted through the power valve. [0003] In the process of outputting power through the negative flow pump, the power valve needs to provide the power valve current to adjust and realize. The power valve current is generally give...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the current negative flow pump power control of construction machinery, because a gear corresponds to a constant power valve current, it will lead to high power and low load working conditions, resulting in waste of power; and when faced with a sudden load, the generator will If there is a problem of excessive instantaneous stall or flameout of the generator, a hydraulic energy-saving device and control method for construction machinery and an excavator are now provided.

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