System and method for diagnosing line replaceable unit failure including measuring a hydraulic pressure and deriving a marginal distribution for each LRU

Patent metadata

Field	Value
Publication number	US-10176070-B2
Application number	US-201514716556-A
Country	US
Kind code	B2
Filing date	May 19, 2015
Priority date	May 19, 2015
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A system and method of identifying part failures is provided. The system may comprise monitoring a sensor, detecting a failure mode, selecting a row from a lookup table corresponding to the failure mode, looking up a line replaceable unit (LRU) failure probability for the detected failure mode, and reporting the LRU failure probability for the detected failure mode.

First claim

What is claimed is:

1. A method of identifying failures of line replaceable units (LRUs) in a brake system of an aircraft, comprising:
measuring a hydraulic pressure level within the brake system using one or more sensors positioned at a measuring point within a hydraulic portion of the brake system;
comparing the hydraulic pressure level to an expected pressure level at the measuring point to detect one or more failure modes in the brake system;
selecting failure mode data corresponding to the one or more failure modes from a lookup table, wherein the failure mode data comprises a plurality of probabilities for failures of a selected set of the LRUs in the brake system and wherein the plurality of probabilities comprise at least one of reliability, safety and management data and expertise data;
deriving a marginal distribution for each one of the selected set of LRUs, wherein the marginal distribution is derived by summing the probabilities corresponding to each one of the selected set of LRUs; and
illuminating an indicator located within the aircraft to report an LRU failure probability for the detected one or more failure modes,
wherein the brake system includes a brake control unit (BCU) connecting the one or more sensors and the indicator and wherein the lookup table is stored within a tangible, non-transitory memory within the BCU.

2. The method of claim 1 , wherein the one or more sensors includes a pressure sensor configured to monitor pressure at a discrete location of a hydraulic brake system.

3. The method of claim 1 , wherein the lookup table comprises at least one of a column or a row for each LRU from a plurality of LRUs.

Assignees

• Goodrich Corp

Inventors

• Cahill Eric D
• Burte Paul R

Classifications

• G06F11/3013 Primary

  where the computing system is an embedded system, i.e. a combination of hardware and software dedicated to perform a certain function in mobile devices, printers, automotive or aircraft systems (testing or monitoring of control systems or parts thereof G05B23/02) · CPC title

• G06F11/3452

  Performance evaluation by statistical analysis · CPC title

• G05B23/024 Primary

  Quantitative history assessment, e.g. mathematical relationships between available data; Functions therefor; Principal component analysis [PCA]; Partial least square [PLS]; Statistical classifiers, e.g. Bayesian networks, linear regression or correlation analysis; Neural networks · CPC title

• G05B23/0259

  characterized by the response to fault detection · CPC title