Electro-hydrostatic actuator with load compensation and high position precision and control method

Abstract

The invention provides an electro-hydrostatic actuator with load compensation and high position precision. The electro-hydrostatic actuator comprises a hydraulic control module, a position control electro-hydrostatic executing module, a load compensation electro-hydrostatic acting module and an electrical control module. The hydraulic control module comprises a combined type hydraulic cylinder, adisplacement sensor and four first electromagnetic reversing valves. The position control electro-hydrostatic executing module and the load compensation electro-hydrostatic acting module each comprisetwo pressure sensors, two second electromagnetic reversing valves, a fixed-displacement hydraulic pump and a motor, and the electrical control module comprises two motor drivers, a power source, an energy accumulator and a controller. The invention further provides a control method of the electro-hydrostatic actuator with load compensation and high position precision. The dependency of the pump speed on load conditions is decoupled, and the contradiction among control precision, dynamic performance and load capacity of an existing electro-hydrostatic actuator is solved.

Description

technical field [0001] The invention relates to a hydraulic control system, in particular to an electrostatic hydraulic actuator with load compensation and high position accuracy and a control method. Background technique [0002] Existing valve control system: engine-variable pump-multi-way valve-multi-actuator drive system requires a centralized oil source to supply oil, and the oil is sent to the actuators at each point through long pipelines, and the pipelines are all over the machine. There are a lot of losses along the way as well as potential leaks. In addition, when the pressurized oil passes through the valve port, a large amount of throttling loss will inevitably occur, resulting in low system efficiency. [0003] As for the electrostatic hydraulic servo actuator, since the servo motor is driving, it can realize variable speed, direction and torque to control the actuator, which greatly simplifies the hydraulic circuit, flexible layout, high efficiency and energy ...

AI Technical Summary

Problems solved by technology

[0006] Electrostatic fluid actuators currently on the market can achieve continuous or multi-stage variable speed, but their control performance (such as dynamic performance, position accuracy, etc.) under variable loads needs to be further improved. Due to the contradiction between the control accuracy, dynamic performance and load capacity of the system, a new electrohydrostatic actuation system for closed-loop position control is proposed

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