Electro-hydrostatic actuator capable of overcoming overloading and control method of electro-hydrostatic actuator

Abstract

The invention discloses an electro-hydrostatic actuator capable of overcoming overloading and a control method of the electro-hydrostatic actuator. The electro-hydrostatic actuator capable of overcoming overloading comprises a speed regulating motor, a bidirectional hydraulic pump, an oil tank, a first oil supplementing one-way valve, a second oil supplementing one-way valve, a first proportional overflow valve, a loop one-way valve, a second proportional overflow valve, a first pressure sensor, a bidirectional hydraulic lock, a second pressure sensor, a hydraulic cylinder and a displacement sensor. According to the electro-hydrostatic actuator capable of overcoming overloading, the hydraulic cylinder can be powered off and locked in any designated position, the energy consumption of a system is effectively reduced, and the electro-hydrostatic actuator can stably work in the second quadrant and the fourth quadrant with the overloading working condition; the set pressure of the first proportional overflow valve and the second proportional overflow valve is set, the pressure loss of the system is effectively reduced, and the energy efficiency of the system is effectively improved.

Description

technical field [0001] The invention relates to the technical field of electrostatic fluid actuators, in particular to an electrostatic fluid actuator capable of overcoming overload and a control method thereof. Background technique [0002] Electro-Hydrostatic Actuator (Electro-Hydrostatic Actuator) is more and more widely used in industry. Compared with traditional hydraulic actuation systems, it has the advantages of small size, light weight, and easy installation and maintenance. In multi-electric aircraft, industrial robots, heavy-duty manipulators, and structural loading tests, electrohydrostatic actuators are used as execution drive units. [0003] Electrostatic hydraulic actuators generally use a motor to drive a two-way hydraulic pump to drive a hydraulic cylinder to reciprocate. The intermediate circuit cancels the reversing valve, which is essentially a pump-controlled cylinder system. After the cylinder of the electrostatic hydraulic actuator moves to the specif...

AI Technical Summary

Problems solved by technology

In addition, when the electrostatic hydraulic actuator works in the first and third quadrants, as long as the output pressure of the system is greater than the external load force, the hydraulic cylinder can realize the action, but when it works in the second and fourth quadrants, because the direction of the load force is different from that of the hydraulic cylinder The running direction is the same, that is, there is an overrunning load. At this time, the oil outlet of the two-way hydraulic pump is only used to replenish oil, and the pressure at the outlet of the two-way hydraulic pump is not established, which is lower than the reverse opening pressure of the hydraulic lock. The oil outlet chamber of the cylinder is locked and cannot return oil, so the hydraulic cylinder cannot operate or shakes due to the frequent switching of the hydraulic lock

Images