Variable-displacement series pump control electro-hydrostatic actuator

Abstract

The invention relates to a variable-displacement series pump control electro-hydrostatic actuator. The actuator comprises a power module, a series pump switching module, an oil supplementing module, a safety overflow module, a pressure and temperature detection module, an actuating mechanism module, a position detection module and hydraulic valve blocks used for connecting all elements, wherein one part of the series pump switching module, one part of the pressure and temperature detection module and one part of the oil supplementing module are connected to the upper surfaces of the hydraulic valve blocks, the other part of the safety overflow module and the other part of the oil supplementing module are connected to the right side surfaces of the hydraulic valve blocks, the executing mechanism module is connected to the front surface of the hydraulic valve block, and the control method is provided on the basis. According to the actuator, the integration level of the system is improved by adopting an integrated connection mode, the reliability of the system is improved by adopting a series pump control system solution, the low-speed pressure flow pulsation phenomenon of the system in the position control process is effectively avoided, and a control method composed of logic control, position closed-loop control and system alarm control is adopted to ensure high reliability of the system.

Description

technical field [0001] The invention belongs to the electro-hydraulic servo control technology, in particular to a variable-displacement serial pump-controlled electric hydrostatic actuator. Background technique [0002] Electro-hydraulic servo control system At present, there are two typical control systems, one is the electro-hydraulic servo valve-controlled hydraulic system, and the other is the electro-hydraulic servo pump-controlled hydraulic system (hereinafter referred to as the electro-hydrostatic actuator). [0003] Among them, the electro-hydraulic servo valve-controlled hydraulic system requires precise hydraulic servo valves, which have high requirements on the quality of the working medium, so the system itself has poor anti-pollution ability, resulting in inconvenience in later maintenance; hydraulic power components, actuators, control components, hydraulic auxiliary components, etc. The components are connected by pipelines, so the integration is low and the ...

AI Technical Summary

Problems solved by technology

[0004] Electric hydrostatic actuators control asymmetric cylinders. At present, servo motors are generally used to drive a single bidirectional pump to supply oil to the two chambers of the cylinder. When the oil supply between the two chambers is switched, due to the large flow difference between the two chambers, low-speed pressure and flow pulsations are likely to occur in the system, which affects the stability and control performance of the system

Images