Model-based method for electro-hydraulic proportional loading

Abstract

The invention provides a model-based method for electro-hydraulic proportional loading and belongs to the technical field of hydraulic loading technology and automation. The method comprises the following steps: pre-establishing conversion relations between the control current and the pressure of a hydraulic proportion valve at different flow rates, namely models; and selecting a corresponding model according to the actual flow rate to complete the pressure control of the proportion valve. As the different models are adopted under different conditions, the control accuracy is improved greatly. As the established models possibly have certain errors, a feedback compensation process is adopted to eliminate the errors in the models. As a result, the pressure control accuracy of the electro-hydraulic proportional valve is improved, the response time is reduced, and the requirements on pressure, force or torque loading are met.

Description

technical field [0001] The invention relates to a model-based electro-hydraulic proportional loading method, which belongs to the field of hydraulic loading technology and automation technology. Background technique [0002] Hydraulic loading due to its larger power volume compared to electric loading. Therefore, it has been widely used. In terms of loading forms, hydraulic loading can be divided into the following three forms according to different loading objects: pressure loading for hydraulic valves; force loading for linear motion mechanisms through hydraulic cylinders; torque loading for rotary motion mechanisms through hydraulic pumps . [0003] The principle of pressure loading for hydraulic valves is as follows: figure 1 As shown, the hydraulic valve 104 is connected to the outlet of the loaded valve 101, and the hydraulic valve 104 is used to control the outlet pressure of the loaded valve 101, so as to complete the pressure loading. The flow sensor 102 and the...

AI Technical Summary

Problems solved by technology

However, there is a serious non-linearity between the control current and the output pressure of the electro-hydraulic proportional valve, especially the relationship between the two is greatly affected by the flow rate. Under different flow rates, the relationship between the control current and the output pressure Correspondence is also different

When the pressure is closed-loop controlled, it is prone to pressure shock, the control accuracy is greatly affected by the flow change, and the response speed is slow.

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