Fault detection and classification method of valve-controlled electro-hydraulic servo system based on observer group

An electro-hydraulic servo system and fault detection technology, applied in general control systems, control/regulation systems, instruments, etc.

Pending Publication Date: 2019-10-11
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0008] Aiming at the problems existing in the prior art, the present invention provides a reasonably designed valve-controlled electro-hydraulic servo system fault detection and classification method based on the observer group, which mainly solves the problem of online fault detection and various problems of the actual valve-controlled electro-hydraulic servo system. The problem of fault type judgment must not only ensure the robustness of external interference, but also ensure the sensitivity to faults

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  • Fault detection and classification method of valve-controlled electro-hydraulic servo system based on observer group
  • Fault detection and classification method of valve-controlled electro-hydraulic servo system based on observer group
  • Fault detection and classification method of valve-controlled electro-hydraulic servo system based on observer group

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[0053] The present invention will be further described below in conjunction with the accompanying drawings of the description.

[0054] like Figure 1-3 As shown, the valve-controlled electro-hydraulic servo system fault detection and classification method based on the observer group, firstly, nonlinear modeling of the valve-controlled electro-hydraulic servo system is carried out, and the nonlinear state equation of the system is established by extracting four state variables . Then model seven common faults, including abnormal oil supply pressure, abnormal oil return pressure, internal leakage of hydraulic cylinder, servo valve / proportional valve, displacement sensor, and hydraulic cylinder inlet and outlet pressure sensor 1 and Pressure sensor 2 is faulty. According to the characteristics of each type of fault and the state space distribution, the system state equation is reorganized to form the corresponding state equation form. A nonlinear robust fault detection and is...

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Abstract

The invention discloses a fault detection and classification method of a valve-controlled electro-hydraulic servo system based on an observer group, comprising: step 1) of performing module division on the system; step 2) of modeling for a common fault; step 3) of reorganizing a system state equation according to a state space distribution of the fault, and establishing a reorganized actuator fault state equation and a reorganized sensor fault state equation; step 4) of constructing a nonlinear robust fault detection and isolation observer group; step 5) of detecting a system fault, namely judging whether a fault exists in the system; and step 6) of starting a fault isolation observer group for judging the type of the fault once it is judged in step (5) that the fault exists in the system.The invention has the advantageous effects that: the invention can perform real time state monitoring and performance prediction on the valve-controlled electro-hydraulic servo system, and can perform automatic online judgment of whether the fault exists in the system and which fault occurs under an unknown time-varying external interference force.

Description

technical field [0001] The invention belongs to the field of fault diagnosis of an electro-hydraulic servo system, in particular to a valve-controlled electro-hydraulic servo system fault detection and classification method based on an observer group. Background technique [0002] The electro-hydraulic servo system is a feedback control system composed of an electric signal processing device and a hydraulic power mechanism. It is widely used in the field of manufacturing because of its advantages such as large power-to-volume ratio, fast response speed, and easy control. The valve-controlled electro-hydraulic servo system is one of the common systems. Its main control element is a hydraulic control valve, which controls the oil in and out of the hydraulic cylinder or hydraulic motor through a servo valve or a proportional valve, so as to realize the position, speed, and force of the actuator. The system has the advantages of fast response and high control precision, so it ha...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 徐巧宁刘毅杜学文艾青林
Owner ZHEJIANG UNIV OF TECH
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