A health state pre-diagnosis method of a hydraulic actuator

By constructing the hysteresis distortion feature vector and distortion evolution curve of the hydraulic actuator, the problems of insufficient accuracy and low reliability of health diagnosis and early warning of the hydraulic actuator in the prior art are solved. This enables high-precision health status prediction and early warning of the hydraulic actuator, and improves the controllability and stability of equipment operation.

CN122407642APending Publication Date: 2026-07-17YANCHENG JIAYIHUI HYDRAULIC MASCH EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YANCHENG JIAYIHUI HYDRAULIC MASCH EQUIP CO LTD
Filing Date
2026-05-17
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing hydraulic actuator health diagnosis technologies cannot accurately capture internal hysteresis distortion and abnormal dynamic response of equipment, and lack the ability to dynamically track the fault evolution process, resulting in insufficient diagnostic accuracy and low early warning reliability, which cannot meet the high-precision health pre-diagnosis requirements of hydraulic actuators in industrial scenarios.

Method used

By acquiring the real-time operating parameters of the hydraulic actuator, a pressure pulse sequence is generated and a displacement response value sequence is captured simultaneously. The rising slope and overshoot of the displacement response waveform are extracted, a hysteresis distortion feature vector is constructed, and a distortion evolution curve is generated. Combined with the second-order difference value and the end slope, a collaborative evaluation is performed to achieve a pre-diagnosis of the health status.

Benefits of technology

It enables refined and dynamic characterization of the health status of hydraulic actuators, effectively identifying early degradation and latent faults, improving diagnostic accuracy and early warning capabilities, reducing the probability of unplanned downtime, extending equipment lifespan, and optimizing operation and maintenance management efficiency.

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Abstract

The application discloses a health state pre-diagnosis method of a hydraulic actuator and relates to the technical field of hydraulic control, which comprises the following steps: acquiring real-time working condition parameters such as target equipment load pressure, working oil temperature and control instruction current; generating a pressure pulse sequence according to the control instruction current and applying the pressure pulse sequence to an oil inlet; synchronously capturing a displacement response value sequence; extracting the rising section slope and overshoot of the displacement response waveform, calculating the change rate sequence of the two and integrating the change rate sequence into a hysteresis distortion characteristic vector; taking the action sequence of the pulses in the pressure pulse sequence as the horizontal coordinate and taking the components in the hysteresis distortion characteristic vector as the vertical coordinate to construct a distortion evolution curve; and obtaining a health pre-diagnosis result through the cooperative evaluation of the positive and negative value alternate frequency of the second-order difference of the curve and the slope of the line connecting the two end points. The application can improve the efficiency of health pre-diagnosis of the hydraulic actuator.
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