Digital Electrostatic Hydraulic Actuator System

Abstract

The present invention proposes a digital electrohydrostatic actuator system, which includes: a servo motor and a hydraulic pump, the servo motor is connected to the hydraulic pump; a high-speed switch valve group, which is connected to the hydraulic pump; a hydraulic cylinder, which is connected to a high-speed switch The valve group, the piston rod of the hydraulic cylinder is connected to the load; the signal processor, which receives the signal and parameters of the sensor; and the system state control unit, which is connected to the signal processor, and controls the servo motor, high-speed switch according to the feedback signal or parameter information The action of the valve group thus forms differential control and load independent control. The system has greater control freedom, higher control precision, energy saving and reliable action.

Description

technical field [0001] The invention belongs to the technical field of electro-hydraulic control, in particular to a digital electro-hydraulic actuator system. Background technique [0002] With the increasing demand for flexible use and low energy consumption of drive mechanisms in aerospace and traditional industries, electrohydrostatic actuators will be widely used in high-power servo mechanisms for future aircraft. [0003] The electrohydrostatic actuator is a highly integrated system of motors, hydraulic pumps, hydraulic valves, accumulators and hydraulic cylinders. Its advantages lie in its high power-to-weight ratio and transmission efficiency. However, traditional electrohydrostatic actuators are generally pump-controlled hydraulic cylinders, so the system responds slowly. When the actuator is an asymmetric cylinder, the control accuracy of the hydraulic system is low due to the influence of the unbalanced flow characteristics of the asymmetric hydraulic cylinder. ...

AI Technical Summary

Problems solved by technology

However, traditional electrostatic hydraulic actuators are generally pump-controlled hydraulic cylinders, so the system responds slowly

When the actuator is an asymmetric cylinder, the control accuracy of the hydraulic system is low due to the influence of the unbalanced flow characteristics of the asymmetric hydraulic cylinder

When the control element is a hydraulic control check valve, the opening and closing time of the valve port is long and cannot meet the high frequency response requirements of the hydraulic system. Although the electro-hydraulic servo valve has a short response time and can obtain high control accuracy, but It has poor anti-pollution ability and high heat generation

Various problems limit the development of electrostatic hydraulic actuators in the direction of high efficiency, energy saving, high response, high control accuracy and high reliability

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