Control method and control system of electro-hydraulic proportional directional valve

Abstract

The invention discloses a control method of an electro-hydraulic proportional directional valve. The method comprises the steps of switching a control handle from an initial state to a maximal deflection angle of the handle, wherein after the defection angle of the control handle is out of the range of handle misoperation prevention (S401), a preset current value (I0) of control current is transmitted to the electro-hydraulic proportional directional control valve (100), and the control current is kept for a preset current retention time (t3); and after the preset current retention time (t3) is over, the control current drops down to a buffer current value (I2). In addition, the invention also provides a control system of the electro-hydraulic proportional direction valve. According to the invention, by using the control method and the control system of the electro-hydraulic proportional direction valve, the response lag time of the electro-hydraulic proportional direction valve can be reduced to an Larger extent without affecting the original performance of the electro-hydraulic proportional direction valve, and accordingly the complete machine performance of the electro-hydraulic proportional direction valve can be enhanced, and thus the quickness and flexibility of engineering mechanical equipment can be improved as a whole.

Description

technical field [0001] The present invention relates to a method for controlling an electromagnetic proportional valve, in particular to a method for controlling an electro-hydraulic proportional directional valve. directional valve. In addition, the invention also relates to an electro-hydraulic proportional directional valve control system. Background technique [0002] With the increasing level of industrial automation, construction machinery equipment, such as the hydraulic system of construction cranes, requires that the pressure and flow of hydraulic oil can be controlled continuously or proportionally. In this case, electro-hydraulic proportional valves are increasingly widely used. Although there are various types of electro-hydraulic proportional valves, their structural principles are basically similar. They are generally composed of two parts: a proportional electromagnet and a hydraulic control valve. The proportional electromagnet receives the input electrical...

AI Technical Summary

Problems solved by technology

[0008] Combining the above existing problem solutions, if the diameter of the main valve stem 2 is reduced, the flow rate of the main valve of the electro-hydraulic proportional directional valve will inevitably be reduced to a certain extent. This kind of solution obviously cannot meet the actual requirements, especially in construction machinery equipment above; if the rated flow rate of the pilot electromagnetic proportional pressure reducing valve is increased, although it can have a certain effect, it has a limited effect on reducing the response delay of the electro-hydraulic proportional directional valve. Substantial modification will obviously increase the processing cost; if the range of anti-misoperation of the handle is reduced, although it can have a certain effect, the adjustment range is very limited, and the anti-misoperation range of the handle is too small, which is easy to cause handle failure. wrong operation

In addition, if the slope of the control current curve is directly increased, although this method can largely solve the problem of the operation response delay of the electro-hydraulic proportional directional valve, the direct increase of the slope of the current curve will cause an increase in the main force of the electro-hydraulic proportional directional valve. When the valve is working, there is a great impact, which is not allowed in the operation of construction machinery and equipment

It can be seen that none of the above-mentioned solutions in the prior art can effectively solve the problem that the response delay is too long

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