Controller of three-stage electro-hydraulic servo valve
A technology of electro-hydraulic servo valves and controllers, which is applied in the direction of electric controllers, controllers with specific characteristics, servo motor components, etc., which can solve the difference in consistency, reduce the uniformity of test equipment, lateral ratio and waveform distortion, etc. problems, to achieve reasonable structural design, expand dynamic response bandwidth, and improve the effect of dynamic response bandwidth
Inactive Publication Date: 2009-07-15
HARBIN INST OF TECH
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Problems solved by technology
[0003] The dynamic characteristics of the traditional three-stage electro-hydraulic servo valve have been basically determined when leaving the factory, and there is usually a relatively large difference in consistency after 70Hz, which reduces the uniformity, lateral ratio and waveform distortion of some test equipment in the high frequency band and other technical indicators
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[0034] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:
[0035] 1. Composition of servo valve controller
[0036] The principle of the servo valve controller is as follows: figure 1 As shown, the given position signal of the servo valve is obtained through the feedforward controller to obtain the first-order feedforward link, which is used as the command signal for the position control of the servo valve spool; ;Amplify the error through the proportional controller and then make a difference with the output signal of the speed feedback controller to obtain the drive signal of the servo valve; , to complete the position closed-loop control of the servo valve. It mainly consists of the following parts:
[0037] The signal input and the feedforward controller convert the ±10mA current command signal output by the computer into a ±10V voltage signal, and then output the command signal of the valve controlle...
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The invention provides a three-stage electro hydraulic servo valve controller which comprises a signal input and feedforward controller, a position closed loop unit, a speed feedback controller and a proportion controller, a servo valve drive unit and a valve core displacement output unit; wherein, the signal input and feedforward controller is used for outputting an instruction signal of a valve controller; a servo valve core displacement signal is used as a feedback signal of the position closed loop control of a servo valve and is subtracted from the instruction signal; the speed feedback controller and the proportion controller are used for improving the frequency width of the servo valve by adjusting the speed feedback gain and the proportion controller gain; the servo valve drive unit is used for generating a servo valve drive signal to drive the servo valve to act; and the servo valve core displacement signal is regulated to form a standard plus minus 10V signal, on the one hand the servo valve core displacement signal is used as the position closed loop control of the servo valve, and on the other hand the servo valve core displacement signal is output to a computer to be used for real-time monitoring after voltage-current conversion. The three-stage electro hydraulic servo valve controller adopts the speed feedback controller and the feedforward controller and develops the dynamic response frequency width of a three-stage electro hydraulic servo valve.
Description
(1) Technical field [0001] The invention relates to the control technology of a three-stage electro-hydraulic servo valve, in particular to a controller for a three-stage electro-hydraulic servo valve. (2) Technical background [0002] In large-scale mechanical environment test equipment such as redundant drive hydraulic vibration test system, multi-point multi-channel coordinated loading test system and road simulation test system, there are high requirements for the dynamic consistency of the servo excitation system, especially around 100Hz Amplitude and phase coherence over frequency are critical to the characteristics of test equipment. The electro-hydraulic servo valve is used as the driving element of the servo exciter, and its dynamic characteristics have a very important influence on the dynamic characteristics of the servo excitation system. The three-stage servo valve controller adjusts the dynamic characteristics of the servo valve to make each servo excitation sy...
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IPC IPC(8): F15B13/02G05B11/42
Inventor 韩俊伟丛大成刘小初叶正茂
Owner HARBIN INST OF TECH
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