Process and device for identifying faults in a complex system

• US 5,774,645 A
• Filed: 08/29/1995
• Issued: 06/30/1998
• Est. Priority Date: 08/29/1994
• Status: Expired due to Term

• Current Assignee: Airbus Operations SAS (Airbus SE)
• Original Assignee: Aerospatiale Societe Nationale Industrielle
• Inventors: Beaujard, Jean-Philippe, Fernekes, Andre
• Primary Examiner(s): Beausoliel, Jr., Robert W.
• Assistant Examiner(s): Wright, Norman M.
• Application Number:
  US08/521,060
• Time in Patent Office: 1,036 Days
• Field of Search: 395/183.13, 395/183.15, 395/183.01, 395/185.02, 395/185.01, 395/184.01, 395/185.1, 395/182.01, 395/181, 395/182.09, 395/182.16 , 395/182.15, 395/182.18, 395/182.2
• US Class Current: 714/25
• CPC Class Codes: G06F 11/0736 in functional embedded systems, i.e. in a data processing system designed as a combination of hardware and software dedicated to performing a certain function testing or monitoring of automated control systems G05B23/02
• CPC Class Codes: G06F 11/0739 in a data processing system embedded in automotive or aircraft systems
• CPC Class Codes: G06F 11/079 Root cause analysis, i.e. error or fault diagnosis in a hardware test environment G06F11/22; in a software test environment G06F11/36

Abstract

A process and device for identifying faults in a complex system containing a plurality of elements connected together are disclosed. The device has a centralized processing station monitoring a system of complex elements which issue fault cues, within a predetermined time, to the central processing station. The fault cues are composed of an identification indicator and an origin indicator that allow the fault cues to be grouped together on the basis of their respective indicators for making a determination as to the origin of the fault. The system aide in the diagnosis and correction of a fault in a complex system, which are involved in locating and repairing such faults.

Claims

1. A process for identifying faults in a complex system containing a plurality of elements connected together, a process according to which:

a) said complex system is divided into a plurality of sets of elements, each of said sets being capable of issuing, upon a fault relating directly or indirectly to at least one of the elements of this set, a fault cue;

b) all the fault cues issued are centralized;

c) the fault cues issued during a predetermined period and which relate to one and the same faulty element are grouped together; and

d) for each of said groupings carried out, the element which is actually faulty and which is at the origin of the relevant fault cues is determined,

wherein;

a fault cue includes an identification indicator, designating the element which the set regards as being faulty, and an origin indicator designating said issuing set;

in step c);

the fault cues for which the identification indicator of one of said fault cues corresponds to the origin indicator of another of said fault cues are grouped together, respectively in first data groups, and, for each first data group thus formed, the fault cues, not already grouped together, for which the identification indicator corresponds to the identification indicator of one of said fault cues of the group, is added thereto; and

fault cues which are not grouped together in said first data groups for which the identification indicators are the same, are grouped together, respectively in second data groups, each of said first and second data groups thus formed containing fault cues having as origin the fault of one and the same element; and

in step d), the element which is actually faulty is;

for the fault cues which were not able to be grouped together, the element designated by the identification indicator;

for the first data groups, either the element designated by the identification indicator which, as the case may be, does not correspond to any origin indicator of the group, or, when a fault cue of the group contains an identification indicator and an origin indicator which are identical, the element designated by these identical indicators; and

for the second data groups, the element designated in a common manner by the identification indicators.

2. The process as claimed in claim 1, wherein said predetermined period is defined in such a way that the following considerations hold:

two fault cues separated by a time greater than said predetermined period are always independent of one another; and

two fault cues separated by a time less than or equal to said predetermined period are capable of being dependent on one another.

3. A process for associating with the fault cues, used in the process specified under claim 1 for identifying faults, corresponding operational cues capable of being issued by said sets of elements of the complex system, said operational cues containing like the fault cues an identification indicator and an origin indicator, wherein:

a) the operational cues are centralized jointly with the fault cues; and

b) for the cues issued during a predefined period, said operational cues are associated, either with the fault cues exhibiting one and the same identification indicator, or with the fault cues for which the origin indicator corresponds to the identification indicator of said operational cues.

4. The process as claimed in claim 3, wherein said predetermined period and said predefined period are identical.

5. The process as claimed in claim 3, wherein each of said operational and fault cues additionally contains a fault evaluation indicator indicating the importance of the fault with respect to the operation of the system, and wherein an operational cue is associated with a fault cue if, in addition to the conditions defined in step b) of the process specified under claim 3, the respective fault evaluation indicators are identical.

6. The process as claimed in claim 5, wherein the fault evaluation indicator is capable of indicating two different levels of fault, one of which corresponds to a major fault, for which the system is no longer able to carry out its function and the other of which corresponds to a minor fault, for which, despite the fault, the system is still able to carry out its function.

7. A device for implementing the process specified under claim 1, wherein it includes:

sets of elements (E1, E2, E3) comprising elementary components (1 to

     8) and at least one computer (C1, C2, C3, C4) connected to said elementary components, said computer being capable of identifying an element subject directly or indirectly to a fault; and

a central computer (COMP), connected to the computer (C1, C2, C4) of each of said sets (E1, E2, E3) and receiving fault cues and possibly operational cues from said computers, said central computer (COMP) grouping together said fault cues and determining from these grouped-together fault cues the elements which are actually faulty, and said central computer (COMP) additionally being capable as the case may be of associating operational cues with corresponding fault cues.

8. The device as claimed in claim 7, wherein said central computer (COMP) includes a memory in which are stored the various fault cues capable of being used by said central computer, said computers (C1, C2, C4) being capable of sending coded signals to said central computer (COMP) enabling the latter to access the appropriate stored cues.

9. The device as claimed in claim 7, wherein said central computer (COMP) includes a time base for logging all the cues received.