Method for high-energy efficiency control over inlet and outlet electro-hydraulic position independent regulation servo system based on proportional overflow valve

Abstract

The invention discloses a method for high-energy efficiency control over an inlet and outlet electro-hydraulic position independent regulation servo system based on a proportional overflow valve. Theoverall control strategy is implemented through four sub-controllers, namely the position controller, the back pressure controller, the overflow pressure regulating controller and the pump flow controller. The position controller controls the flow of an oil inlet cavity of a hydraulic actuator through adjusting the position of a valve core of a servo valve I on the basis of a given position instruction and actual position feedback of the hydraulic actuator; the back pressure controller controls the pressure of an oil outlet cavity of the hydraulic actuator by adjusting the position of a valvecore of a servo valve II on the basis of the reference back pressure value and the actual back pressure cavity pressure of the hydraulic actuator; based on the pressure of the oil inlet cavity and thepressure drop on the valve I, the overflow pressure adjusting controller adjusts the proportional overflow valve online, and sets the oil source pressure of a hydraulic system in real time to reducethe pressure loss of a valve port; and by adjusting the rotating speed of a motor, the flow controller adjusts the flow output of a pump to be matched with the flow required by the system in real timeso as to reduce overflow flow loss.

Description

technical field [0001] The invention belongs to the technical field of hydraulic servo control, and specifically relates to a high-energy-efficiency control method for an electro-hydraulic position servo system with independent adjustment of inlet and outlet based on a proportional overflow valve. Background technique [0002] The electro-hydraulic valve-controlled servo system has the advantages of large power density ratio, large output force, and fast response speed, and can be used for large inertia and high-precision servo applications. Its application has been widely used in various fields of industry and economy, such as the control of missile steering gear, the control of artillery, the thickness control of strip mills, etc. The traditional electro-hydraulic valve-controlled servo system uses a single servo valve to control the two chambers of the hydraulic actuator 2, and controls the displacement, speed, and output force of the hydraulic actuator by adjusting the d...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of low energy efficiency of the electro-hydraulic valve control servo system, the present invention provides an electro-hydraulic position servo system with low pressure loss, low system heat generation and high energy efficiency with independent adjustment of the import and export on the basis of ensuring the dynamic performance of the electro-hydraulic position servo control method

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