Hysteresis compensation control method and system for electric proportional overflow valve

Abstract

The invention discloses a hysteresis compensation control method and system for an electric proportional overflow valve. The hysteresis compensation control method for the electric proportional overflow valve comprises the steps that linear processing is conducted on an input signal; carrying out linear processing on the output signal; calculating a current second parameter difference delta O; and judging a closed-loop control mode. According to the hysteresis compensation control method for the electric proportional overflow valve, the control mode is selected according to the relation between the second parameter difference delta O and the preset deviations K1 and K2, when delta O is larger than or equal to K1, the change of the second parameter Oy output by the proportional valve can rapidly follow the change of the current signal output by the controller, and the control output error is reduced to be smaller than or equal to K1; when K2lt; [delta] Olt; when K1 is greater than K1, the hysteresis is further finely controlled by adjusting flutter, and the second parameter difference is reduced to be smaller than or equal to K2.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a hysteresis compensation control method for an electric proportional overflow valve. It also relates to a hysteresis compensation control system for an electric proportional overflow valve. Background technique [0002] Proportional valves are widely used in various types of mechanical equipment, using electrical input signals to achieve remote control of hydraulic system pressure, flow and other parameters in proportion. [0003] The proportional valve has an open-loop control in the hydraulic system control mode, and a closed-loop control that uses pressure or flow as feedback. Compared with ordinary valves, the use of proportional valves can improve the control accuracy of hydraulic systems. However, when controlling the proportional valve, there is a situation that the change speed of the opening control of the proportional valve is inconsistent with the change s...

AI Technical Summary

Problems solved by technology

However, when controlling the proportional valve, the opening control change speed of the proportional valve is inconsistent with the output target change speed.

In addition, during the working process of the electromagnet inside the proportional valve, its material has hysteresis characteristics, and there is friction between the moving components of the valve and the relative movement of the valve chamber, which will cause the steady-state characteristics of the proportional valve to show a hysteresis phenomenon, that is, proportional In the process of valve control, the output of the proportional valve is different when the same electrical input signal is adjusted for increase and decrease.

The current solution is generally to improve the processing accuracy and assembly requirements of relevant hydraulic components, and to perform closed-loop control on the output target (such as pressure, flow, etc.) and valve core position of the proportional valve, which has problems such as limited precision, complex algorithm, and difficult operation.

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