Digital electro-hydraulic proportional servo valve command signal conditioning method

Abstract

The invention provides a digital electro-hydraulic proportional servo valve command signal conditioning method which is applied to a digital electro-hydraulic proportional servo valve command signal conditioning model, and the model issequentially connected with a conversion module, a polarity switching module, a first amplitude limiting module, a filtering module, a slope buffering module, a flow characteristic module, a zero offset adjusting module, a dead zone hopping module and a positive and negative gain adjusting module from a signal input position to a signal output position. The method comprises the steps that a first signal obtained from an upper computer is converted, and a second signal is determined; and then a conditioned signal is obtained through polarity switching processing, first amplitude limiting processing, filtering processing, slope-to-buffer processing, flow characteristic processing, zero offset adjustment, dead zone hopping processing and positive and negative gain adjustment processing in sequence. According to the method provided by the invention, parameters of each module can be customized and configured through upper computer software, and the method has abundant digital control functions, can be compatible with multiple types of instruction signals, and realizes diversified switching of product flow characteristics.

Description

technical field [0001] The present application relates to the technical field of electro-hydraulic proportional control, in particular to a digital electro-hydraulic proportional servo valve instruction signal conditioning method. Background technique [0002] The electro-hydraulic proportional servo valve is an important control element in the electro-hydraulic servo system, which plays the role of electro-hydraulic conversion and power amplification in the system. The electro-hydraulic proportional servo valve controller controls the proportional electromagnet to drive the spool valve core to move proportionally according to the command signal, so as to control the size and direction of the throttling edge, and realize the proportional closed-loop control of the fluid. [0003] In order to improve the applicability of the subsequent use of the product, the traditional proportional servo valve controller usually includes circuits such as dead zone jumping, zero bias and slo...

AI Technical Summary

Problems solved by technology

[0003] In order to improve the applicability of the subsequent use of the product, the traditional proportional servo valve controller usually includes circuits such as dead zone jumping, zero bias and slope buffering in the command signal section. In domestic products, these parameters are adjusted by electronic components in the analog circuit. It is cumbersome and inconvenient to adjust the parameters of components, and it is easily affected by the aging and temperature drift of electronic components.

On the other hand, when the product leaves the factory, the input signal type and basic flow characteristics of the product itself have been determined, and cannot be changed according to the site environment of the product. Once the use conditions, such as signal type, spool flow curve characteristics, etc. It is necessary to replace the corresponding type of proportional servo valve products, which seriously increases the money cost and time cost of the user

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