Low-energy-consumption high-dynamic pump valve combined position servo system and control method thereof

A servo system, high dynamic technology, applied in the direction of fluid pressure actuation system components, fluid pressure actuation system testing, servo motor, etc., can solve the problems of different effective area, asymmetric flow of inlet and outlet, etc., to achieve high frequency noise, solving dynamic flow asymmetry, and the effect of high-precision motion tracking tasks

Active Publication Date: 2019-11-01
晋中市榆次海洋液压有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in the effective area of ​​the two chambers of the single rod cylinder, the flow rates of the inlet and outlet of the two chambers are asymmetrical.

Method used

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  • Low-energy-consumption high-dynamic pump valve combined position servo system and control method thereof
  • Low-energy-consumption high-dynamic pump valve combined position servo system and control method thereof
  • Low-energy-consumption high-dynamic pump valve combined position servo system and control method thereof

Examples

Experimental program
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Embodiment

[0035] combine figure 1 , figure 2 and image 3 , the simulation model is mainly composed of a speed servo subsystem directly driven by a bidirectional pump 3 and an asymmetric hydraulic cylinder 9 and a valve-controlled displacement servo subsystem based on a constant pressure source. The model comprehensively considered factors such as the elastic modulus of the oil, the stiffness of the motor-pump connection, the inertia of the motor and the pump, the Coulomb friction, static friction and viscous friction of the hydraulic cylinder. Depend on image 3 The system parameters of the valve control subsystem 22 shown are known, because the pump direct drive speed servo subsystem provides the main flow for the actuator, the valve control subsystem 22 can use high frequency response and small flow specification servo valve + small displacement high pressure oil Source scheme composition. The pump-valve joint control system combines the advantages of the high energy efficiency ...

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Abstract

The invention relates to the technical field of hydraulic control, and discloses a low-energy-consumption high-dynamic pump valve combined position servo system and a control method thereof. The system comprises an asymmetric hydraulic cylinder, a bidirectional pump, a pump control subsystem and a valve control subsystem, wherein the asymmetric hydraulic cylinder is used for driving a load, the bidirectional pump is used for directly driving the asymmetric hydraulic cylinder, two oil outlets of the bidirectional pump are connected with a rod cavity and a rodless cavity of the asymmetric hydraulic cylinder respectively, the pump control subsystem is used for realizing controlling of the speed and displacement of a piston rod of the asymmetric hydraulic cylinder, and the valve control subsystem is used for realizing controlling of the output displacement of the piston rod of the asymmetric hydraulic cylinder. According to the system and the method, by means of asymmetric flow compensation, the problem of asymmetric dynamic flow of the asymmetric hydraulic cylinder is well solved, high-frequency response and high-precision motion tracking tasks can be realized through double closed-loop control of the pump control subsystem and the valve control subsystem, most of the flow required by load movement is provided by a pump control mode, and the dynamic response of the system is considered while the energy utilization efficiency of the hydraulic system is ensured.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a low energy consumption and high dynamic pump valve joint position servo system and a control method thereof. Background technique [0002] The pump direct drive actuator technology matches the output flow of the pump with the load demand by controlling the speed of the drive motor or the displacement of the pump. There is no need to set a throttle valve on the main circuit of this type of system, which eliminates throttling loss, so the energy efficiency of the pump control system is very high. Relevant studies have shown that the energy utilization efficiency of the pump control system can be increased by more than 40% compared with the valve control system. Pump direct drive actuator technology is an ideal way to realize the "green development" of electro-hydraulic systems, and it is also an important research direction of electro-hydraulic servo control technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/08F15B13/04F15B19/00F15B21/00
CPCF15B11/08F15B13/0401F15B19/00F15B21/001
Inventor 汪成文张震阳郭新平吉鑫浩权龙
Owner 晋中市榆次海洋液压有限公司
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