Controller reference power supply fault diagnosis and correction method based on compressed sensing

Abstract

The invention relates to a controller reference power supply fault diagnosis and correction method based on compressed sensing, and the method comprises the following steps: carrying out the system analysis of an internal reference power supply circuit of an aero-engine controller, building a correlation model, and obtaining a correlation graphical representation model and a mathematical model matrix; establishing a linearized fault equation according to the correlation model; based on an orthogonal matching pursuit algorithm, a fault mode is obtained through reconstruction of the measured value and the fault feature matrix, and fault diagnosis of the reference power supply is achieved; and by calculating the projection lengths of the measured values in different fault subspaces, the offset proportions of all the parts are evaluated, so that reference power supply correction is realized, and the measured values are corrected. According to the invention, the fault detection rate of the system is improved, the test point demand can be reduced, the positioning of a single-point fault and a multi-point combined fault can be realized at the same time, an effective means is provided for the health management of the system, a reference power supply deviation correction method is provided, and the measurement precision of the controller is improved.

Description

technical field [0001] The invention belongs to the general design field of an aero-engine control system, in particular to a method for diagnosing and correcting faults of controller reference power supplies based on compressed sensing. Background technique [0002] The aero-engine control system is the control center of the aero-engine, and the electronic controller is the main device of the control system, and its reliability is of great significance to the safe operation of the aero-engine. The voltage reference source is a high-precision and high-stability power supply in the internal circuit of the controller, which generally provides a reference for other work acquisition voltages. The accuracy of the reference power supply is related to the temperature, humidity and long-term working stability of the working environment. The influence of external or internal factors may cause abnormalities such as attenuation, drift or even failure of the reference power supply, whic...

AI Technical Summary

Problems solved by technology

The accuracy of the reference power supply is related to the temperature, humidity and long-term working stability of the working environment. The influence of external or internal factors may cause abnormalities such as attenuation, drift or even failure of the reference power supply, which will cause deviations in a large number of related measurement parameters and seriously affect Control accuracy and performance of the entire system

[0003] At present, the controller can monitor, locate and isolate some power failures through resources such as BIT and power alarm circuit, but there are still two deficiencies in the following two aspects: On the one hand, the system only monitors the normal and fault failures of the internal power supply of the controller. However, there is a lack of system-level impact analysis, abnormality detection, and correction countermeasures for abnormalities and recessions other than normal and faults; on the other hand, there are some unmeasurable reference power sources inside the controller, which need Correlation carries out positive testability design and verification, makes full use of the test resources inside the controller, realizes 100% detection coverage of key power supply faults, and improves system testability and reliability

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