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A Displacement Control Method of Electro-hydraulic Actuator

An electro-hydraulic actuator and displacement control technology, applied in the direction of servo meter circuit, servo motor components, fluid pressure actuation system components, etc., can solve the problems of not wide application range of temperature, low control accuracy and low control efficiency, etc. Achieve the effect of improving control efficiency, improving control accuracy, and eliminating control errors

Active Publication Date: 2020-04-17
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a displacement control method for electro-hydraulic actuators, which is used to solve the problems of low control efficiency, low control accuracy, and limited range of temperature application in the prior art.

Method used

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  • A Displacement Control Method of Electro-hydraulic Actuator
  • A Displacement Control Method of Electro-hydraulic Actuator
  • A Displacement Control Method of Electro-hydraulic Actuator

Examples

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Embodiment 1

[0049] In this embodiment, a displacement control method of an electro-hydraulic actuator is disclosed. The control method is executed after the control signal of the electro-hydraulic actuator controller is in a specific control mode and exceeds a certain amount of variation.

[0050] In this example, if figure 1 As shown, a closed-loop control method of an electro-hydraulic actuator is provided. Since the electro-hydraulic actuator works in a wide temperature range (-20°C to +50°C) and a wide load range (-45000N to +45000N), and requires To meet the positioning requirements of high precision (0.15%), the method is realized through the PID closed-loop control algorithm. Since the PID algorithm needs to collect control signals and feedback signals, this control method needs to be able to collect feedback signals after the electro-hydraulic actuator is running. In this embodiment, the control method provided in this embodiment is executed after the displacement sensor can colle...

Embodiment 2

[0128] In this embodiment, a precision test is carried out on a displacement control method of an electro-hydraulic actuator provided by the present invention, and the test is divided into a normal temperature test and a high and low temperature test.

[0129] Combining the method provided by the present invention with the existing electro-hydraulic actuator, the normal temperature test process is:

[0130] Step 1: Power on the equipment, set the output; power on the electro-hydraulic actuator, and set the control parameters by operating the keyboard, including the control accuracy of 0.03mm;

[0131] Step 2: Set the minimum speed of the motor, the maximum speed of the motor (can not exceed the rated speed); set the parameters such as system position and signal;

[0132] Step 3: Use a standard signal source to simulate the DCS to set the target position, the controller responds to the signal and adjusts the actuator to reach the corresponding position, and records the position...

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Abstract

The invention discloses a displacement control method of an electro-hydraulic executer. A segmented PID closed-loop control method is used for indirectly controlling the displacement of an output shaft of a hydraulic cylinder in the electro-hydraulic executer, the displacement, collected by a displacement sensor, of the output shaft in the hydraulic cylinder serves as the feedback quantity to participate in closed-loop control, the output execution amount is controlled to be the rotating speed and the steering direction of a servo motor, and a temperature compensation method is used for compensating for the overall temperature drift of the electro-hydraulic executer. The control efficiency of the control method is improved, the control precision of the control method is improved, errors caused by the temperature drift are eliminated, and the control precision of the electro-hydraulic executer under the multi-load work condition is met.

Description

technical field [0001] The invention relates to a control method of an electro-hydraulic control device, in particular to a displacement control method of an electro-hydraulic actuator. Background technique [0002] The electro-hydraulic actuator is a direct-drive electro-hydraulic servo system, also known as a valveless servo control system. It controls the displacement, speed and direction of motion of the output shaft in the hydraulic cylinder by controlling the speed and steering of the AC servo motor, so as to achieve large Thrust, high speed motion control. The control algorithm of some domestic products mostly adopts conventional PID control, fuzzy PID algorithm, etc., and the output of the position sensor used is basically analog; the REXA Xpac actuator of the American KOSO company, its high-precision realization is based on the flow matching system. The pump drives the hydraulic cylinder, and once it reaches the specified position, the motor stops working (locking ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/16F15B21/08
CPCF15B13/16F15B21/087F15B2211/613
Inventor 田中山井健赖少川董珊珊杨昌群张书荣刘维国徐中节
Owner CHINA PETROLEUM & CHEM CORP
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