CN102092477A - Device and method for automatic test and fault diagnosis of plane audio integrated system - Google Patents
Device and method for automatic test and fault diagnosis of plane audio integrated system Download PDFInfo
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Abstract
The invention relates to a device and method for automatic test and fault diagnosis of a plane audio integrated system, which are used for maintaining the plane audio integrated system of Airbus series and Boeing series. The method comprises the steps of: operating test software by an industrial personal computer to provide a man-machine interaction environment, and carrying out analysis, computation and statistic treatment on acquired data so as to further complete fault diagnosis; compiling a fault diagnosis program according to all circuit diagrams and test point information of the audio integrated system, provided by a CMM (Capability Maturity Model for Software) manual, and clearing up injected data information on faults, excitation, response and the like to form a fault record in a fault dictionary; in the fault diagnosis program, providing the positions of testing points in need of manual measurement and corresponding test information; testing the testing points in need of manual measurement by detection personnel to confirm a fault area, and displaying corresponding diagnosis results. The device and method provided by the invention can commonly meet the requirement of the automatic test for two types of audio integrated systems including the AMU (Audio Management Unit) of Airbus series planes and the REU (Remote Electronic unit) of the Boeing series planes, and are favorable for reducing the labor intensity of maintenance personnel and improving maintenance efficiency.
Description
Technical field
The present invention relates to civil aviaton maintenance technique field, particularly the automatic test of aircraft audio system ensemble and the trouble-shooter and the method for Air Passenger/Boeing type.
Background technology
In the communication management system of Air Passenger series and Boeing series aircraft, the Audio Management Unit of Air Passenger series, Boeing-747 and new series aircraft (Audio Management Unit, AMU) and Boeing-737 etc. than aircraft Remote Electronic Unit (the Remote Electronic Unit of old model, REU) be the assembly of very important audio frequency system ensemble, said modules is used for the management and the control of audio resource.According to statistics, the easy et out of order of these audio frequency system ensembles.And they are the maincenter equipment that Flight Management Computer and many group signals are cross-linked with each other, if audio frequency system ensemble fault can not be keeped in repair fast and accurately, will make the communications management system of passenger plane to work unobstructedly, and then normally the taking off of Flights Delayed, even influence that aircraft is normal, safe flight.A lot of function tests of AMU and REU all need be by means of audio frequency control panel (Audio Control Panel simultaneously, ACP) operate and control, the method that the test of AMU and REU is adopted usually is at present: the manual detection mode of carrying out assistant adjustment by the selective call signal source of ACP and special use, this method, test duration is long, and personal error is more.And ACP belongs to boat material instrument, and is easily impaired in transportation, also do not have commonality.
China's utility application 200420090466.7,200620040052.2,200820140777.8 and 200920315111.6 discloses a kind of airborne equipment comprehensive detection system, and this system can only finish the troubleshooting of MCP and Performance Detection.Chinese invention patent application the 200810054132.7th and 200910068749.9 discloses a kind of at Air Passenger series aircraft audio Management Unit and a kind of device and method of testing automatically at Boeing series aircraft audio Management Unit respectively.The former is applicable to the AMU of Air Passenger series, and the latter is applicable to the REU of Boeing series and since they at tested object single, use to have limitation; Not only do not possess the test function that is applicable to Air Passenger series and Boeing series A MU and REU simultaneously, and do not possess the function of AMU and REU being carried out trouble diagnosing.Therefore be necessary to develop automatic test and the trouble-shooter that is common to AMU and REU specially.
Though AMU is the different products of two classes with REU, model is numerous, and is incompatible, and function is close.The both is all sound signals and relevant discrete signal on the management aircraft, with a plurality of system relationships such as words, Passenger Address, data logging, airborne maintenance in words, the service in radio communication, radio navigation, the flight.In addition, their interface all will be observed unified international standard standard, thereby a lot of something in commons are arranged aspect test.
Exploitation can be satisfied the AMU of Air Passenger series aircraft and the automatic checkout test equipment of this two classes audio frequency system ensemble of Boeing series aircraft REU jointly, make it further detected fault to be judged, possesses the function of AMU and REU being carried out trouble diagnosing, can reduce maintainer's labour intensity, improve maintenance efficiency.And domestic still do not have at present Related product and correlation technique the report.
Summary of the invention
Purpose of the present invention in order to address the above problem, provides a kind of device that integrates automatic test and trouble diagnosing exactly for overcoming the deficiencies in the prior art, is used to keep in repair Air Passenger series and Boeing series aircraft audio system ensemble.
The present invention realizes by such technical scheme: the aircraft audio system ensemble is test and trouble-shooter automatically, comprises industrial computer, adaptor module, automatic test module and external equipment; It is characterized in that,, provide man-machine interaction environment by industrial computer operation test software, to the data of gathering analyze, calculating and statistical treatment, and then finish trouble diagnosing; Industrial computer, automatic test module be the connection adaptor module respectively, and adaptor module also is provided with the communication interface that connects measurand (UUT);
Industrial computer is communicated by letter with measurand (UUT) by the communication interface of adaptor module with automatic test module; Industrial computer and automatic test module controllable adapter module provide power supply to measurand (UUT);
Described adaptor module comprises test interface interconnecting module, selftest module and power module; Wherein the test interface interconnecting module is made of chip MAX232, chip 74HC245, chip FT245BM and peripheral circuit thereof;
Chip MAX232 is connected with Asynchronous Serial Interface, will convert parallel data (TTL/CMOS) from the serial data that Asynchronous Serial Interface imports into to by chip MAX232 and import parallel data bus line into;
Chip 74HC245 is connected with parallel interface, and as the data buffer of parallel port, 74HC245 imports parallel data into parallel data bus line by chip;
Chip FT245BM is connected with USB interface, by chip the data transfer that USB interface imports into is become parallel data, imports parallel data into parallel data bus line;
The selftest module of described adaptor module connects expansion eeprom memory, clock circuit, reset circuit, address decoder and watchdog circuit by treater CPU and constitutes, and wherein, CPU comprises ROM, RAM and TIMER, and self-check program is stored among the treater ROM;
Selftest module receives discrete variable information and the failure message that comes from automatic test module, and the discrete variable information storage is in RAM, and failure message is stored among the expansion EEPROM;
The test interface interconnecting module of described adaptor module is connected with selftest module; Selftest module test interface interconnecting module and automatic test module communication;
Described automatic test module is made of digital input-output unit, relay switch matrix, digital versatile table unit, audio signal generator, dynamic signal analysis unit and data collecting card, and automatic test module is accepted the control of autotest program in the industrial computer;
Adopt the input and output of 96 road TTL/CMOS numeral;
Adopt No. 24 relay switch matrixes;
Adopt 6 half word multi-meter unit;
Adopt 24 dynamic signal analysis unit;
Connect with the intermediate relay coil by the digital quantity output point;
Be connected with the intermediate relay contact by audio signal channel;
Constitute audio signal channel by digital input-output unit, relay switch matrix switch;
Produce the required various pumping signals of test by audio signal generator;
Described automatic test module comes from the response signal of measurand (UUT) output by the data collecting card collection; By digital versatile table unit and dynamic signal analysis unit the data of gathering are carried out " A " weighted filtering, degree of distortion analysis and Analysis signal-to-noise ratio (SNR);
The aircraft audio system ensemble is test and method for diagnosing faults automatically, is used to keep in repair Air Passenger series and Boeing series aircraft audio system ensemble, it is characterized in that, is undertaken by following order step:
(1) equipment self-inspection; The automatic test of measurand (UUT) and aircraft audio system ensemble is linked to each other POST with trouble-shooter;
(2) device initialize; Select to detect type and the piece number and the test event of measurand, hardware and main test program are carried out initialization;
(3) signal loading: by industrial computer operation test software, carry out test instruction, select excitation channel number and pumping signal, be loaded into automatic test module, produce correspondent voltage, electric current, pumping signal and be loaded into the test signal input end of measurand (UUT) by adaptor module;
(4) data acquisition: measurand (UUT) is under the pumping signal effect, and output response signal is transferred to automatic test module by adaptor module, and automatic test module is transferred to industrial computer with the digital signal of gathering by adaptor module;
(5) fault judgement: the industrial computer test software calls the fault judgement program, and the digital signal of collection and the ideal value on the manual of maintenance (CMM) are compared, and judges that the output signal of measurand (UUT) is disablement signal or qualified signal; If judged result is qualified signal, then on industrial computer, show " test is passed through " information; If judged result is a disablement signal, show that then there is fault in measurand (UUT), then enters troubleshooting step;
(6) trouble diagnosing: AMU is divided into five functional modules: power module, interface module, audio processing modules, selective call module and BIT module are carried out trouble diagnosing; According to the value contrast CMM handbook of output signal, failure judgement position; According to the CMM handbook provide all circuit diagrams and the test point information preparation fault diagnostic program of audio frequency system ensemble, at first the circuit to AMU carries out modeling; Call and the corresponding circuit diagram of failure circuit, making up fault dictionary is Mishap Database, calls and the corresponding circuit diagram of failure circuit, and the structure fault dictionary is that the step of Mishap Database comprises:
A, fault implantation step: the operating troubles diagnostic program, power on for tested known fault circuit, gather, inject the data message of known fault in view of the above; Analog logic fault in treating the failure circuit of emulation; Described logic fault is to draw phenomenon of the failure in conjunction with actual service experience; Inject the data message of corresponding failure in view of the above; The probability that breaks down according to element injects the data message of fault;
B, fault simulation step: according to the data message of the fault of injecting, the response of analysis circuit and the detecting information of each test point;
The arrangement step of c, simulation result: will inject data messages such as fault, excitation, response and put in order, and form a failure record in the fault dictionary;
(7) fault diagnostic program comprises position and the corresponding detecting information that provides the test point that needs manual measurement, the testing staff tests the test point that needs manual measurement, the test back is from industrial computer typing dependent failure information, fault diagnostic program is searched fault dictionary according to input information, determine the fault zone, and show corresponding diagnostic result;
(8) judge whether to finish all test events;
(9) finish test.
The present invention moves test software by industrial computer, and man-machine interaction environment is provided, to the data of gathering analyze, calculating and statistical treatment, and then finish trouble diagnosing; Can satisfy the AMU of Air Passenger series aircraft and the automatic checkout test equipment of this two classes audio frequency system ensemble of Boeing series aircraft REU jointly, make it further detected fault to be judged, possesses the function of AMU and REU being carried out trouble diagnosing, can reduce maintainer's labour intensity, improve maintenance efficiency.
Description of drawings
Fig. 1 is the structured flowchart of automatic test of Air Passenger/Boeing audio frequency system ensemble and trouble-shooter;
Fig. 2 tests and Troubleshooting Flowchart automatically;
Fig. 3 is the adaptor module structured flowchart;
Fig. 4 is the selftest module structured flowchart;
Fig. 5 is the automatic test module composition frame chart.
The specific embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
To shown in Figure 5, the automatic checkout test equipment of Air Passenger provided by the invention and Boeing series aircraft audio system ensemble comprises industrial computer 1, adaptor module 2, automatic test module 3 and external equipment 4 as Fig. 1; Wherein industrial computer 1 provides man-machine interaction environment for the user, the user can operate, whole automatic testing process is controlled and monitored total system on computers, the data of gathering are analyzed, calculated and add up, and then finish the work of trouble diagnosing; Adaptor module 2 is the interfaces between industrial computer 1 and automatic test module 3, automatic test module 3 and the measurand (UUT) 5, finishes the transmission of control signal and data-signal, the work of exchange; Simultaneously, under the control of industrial computer 1 and automatic test module 3, provide power supply to measurand (UUT) 5; Automatic test module 3 is used to produce the required various pumping signals of test, and finishes the work of gathering the response signal that comes from measurand (UUT) 5 outputs; External equipment 4 can print the test inventory constantly under the control of industrial computer 1, make fault project classification, and it is more reasonable that test assignment is distributed.
When needs detect a certain audio frequency system ensemble, can be with the audio frequency system ensemble, be that measurand (UUT) 5 among Fig. 1 links to each other with failure diagnosis apparatus with automatic test provided by the invention and power on, industrial computer 1 is by operation loading autotest program collection thereon, test instruction is loaded into automatic test module 3 by adaptor module 2, in automatic test module 3, produce pumping signal, control adaptor module 2 again, signals such as voltage, electric current, excitation are offered measurand (UUT) 5, allow measurand (UUT) 5 work; The response signal of measurand (UUT) 5 output is transferred to automatic test module 3 by adaptor module 2 carries out data acquisition, the data that collect are transferred to industrial computer 1 by adaptor module 2; Industrial computer 1 calls fault diagnostic program, and the signal of collection and the ideal value on the manual of maintenance (CMM) are compared, and judges that output signal is disablement signal or qualified signal; If judged result is a disablement signal, show that then there is fault in measurand (UUT), by fault diagnostic program and based on the CMM handbook,, determine position of fault by searching fault dictionary, show corresponding test data and diagnostic result; If judged result is qualified signal, then on industrial computer, show " test is passed through " information; Judge whether then to finish all test events, if do not finish then proceed the test of the next item down, if finished, then the printing test result finishes test.
As shown in Figure 2, the automatic test and the fault diagnosis flow scheme of Air Passenger provided by the invention and Boeing series aircraft audio system ensemble are:
Whether (1) first self check after the device power, all modules of checking test automatically and trouble-shooter self can both normal operation; If self check is passed through, then prepare to enter next procedure (2); If self check is not passed through, then enter last end step (8);
(2) selection detects type and the piece number and the test event of measurand, and hardware and main test program are carried out initialization;
(3) industrial computer produces a series of test instructions, comprises excitation channel number and pumping signal, is loaded into automatic test module by adaptor module, produces signals such as correspondent voltage, electric current, excitation, is loaded on the input end of UUT, makes its work;
(4) UUT is under the pumping signal effect, and output response signal is transferred to automatic test module by adapter and carries out data acquisition, and the digital signal that collects is transferred to industrial computer by adapter;
(5) fault judgement: industrial computer calls the fault judgement program, and the signal of collection and the ideal value on the manual of maintenance (CMM) are compared, and judges that output signal is disablement signal or qualified signal; If judged result is qualified signal, then on industrial computer, show " test is passed through " information; If judged result is a disablement signal, show that then there is fault in measurand (UUT).Then enter step (6).
(6) trouble diagnosing: AMU can be divided into five functional modules: power module, interface module, audio processing modules, selective call module and BIT module.Each module all has corresponding circuit.Therefore, can judge it is which piece circuit goes wrong according to the value of output signal based on the CMM handbook.On the other hand, the CMM handbook has provided all circuit diagrams and the test point of audio frequency system ensemble.Based on these circuit diagrams, fault diagnostic program carries out modeling to the circuit of AMU.Like this, can call and the corresponding circuit diagram of failure circuit, make up fault dictionary.The foundation of fault dictionary is to form by three steps of arrangement of fault injection, fault simulation, simulation result.Fault is injected: in fault diagnosis software, power on to failure circuit, and place the failure circuit for the treatment of emulation with input end grounding or with a logic fault.The logic fault that provides combines service experience in the past, and the probability that breaks down according to element injects fault, and therefore, fault should be some necessary reasonable assumptions, as some faults being made complete conservative hypothesis content to retain sovereignty over a part of the country, puts aside human failure; Fault simulation: according to the fault of injecting, the response of analysis circuit and the detecting information of each test point; The arrangement of simulation result: will inject data messages such as fault, excitation, response and put in order, and form a fault collection record.Like this, just can construct a fault dictionary through above three steps.Fault diagnostic program can provide the position and the corresponding detecting information of the test point that needs manual measurement, and the testing staff inserts relevant information after test.Fault diagnostic program is searched fault dictionary according to input information, determines position of fault, and shows corresponding diagnostic result;
(7) judge whether to finish all test items; If do not finish, turn back to step (2), carry out next test event; If all finish test, then enter step (8);
(8) finish test.
Embodiment one:
Selecting the Audio Management Unit REU5140 of the choosing dress of Boeing-737 series aircraft for use is tested object, as TCH test channel, finishes test events such as frequency response distortion with the VHF1 of captain position and HF1.
For startup is provided with the interface, the user can select to test accordingly piece number, test event and dependence test parameter on the interface.After accomplishing the setting up, click " determining ", begin test, enter into automatic test phase, can suspend, continue or stop test in the test process at any time.After test is finished, do not detect fault, then normal shown in the test result.
Embodiment two:
Audio Management Unit AMU2790 series and audio frequency control panel ACP (piece number: 1167015) detect to the choosing of Air Passenger 319/320/321 series aircraft dress.By startup the interface is set, finishes the parameter setting, click " determining ", enter automatic test phase.Detect among the ACP1167015 input the output circuit plate break down.
Set up the output state fault and inject the interface, reaction be when outputing signal to AMU by ACP, the situation of whole communication system.The fault of injecting is made of 6 frame data words, 8 bytes of every frame, 48 position digital signals altogether.In this example, produce pumping signal at passages such as SPARE INPUT, ILS-C, HF-R, the PAM analog signal is set simultaneously is input as 3.5, control signal word 0011 injects the hurdle at the right side failure of chip and injects faults such as corresponding s-a-0 or s-a-1.
After diagnostic result draws, click " fault demonstration " button, indicator lamps such as demonstration SAT-RC are " B ", and expression Bright (lamp is bright) indicates that mistake appears in the signal of this chip pin now; All the other indicator lamps all show " D ", and expression Dim (lamp goes out) indicates that the signal of this chip pin is correct now.Click " former demonstration " button, can show in the fault dictionary and corresponding failure message of this phenomenon of the failure and fault zone code.In addition, the tester also can contrast Component Maintenance Manual CMM handbook, analysis of failure state and zone, the content that can constantly expand fault dictionary.
Industrial computer is the core of whole testing diagnosis equipment, its effect is to provide man-machine interaction environment for the user, the user can operate, whole automatic testing process is controlled and monitored total system on industrial computer, the data of gathering are analyzed, calculated and add up, and then finish the work of trouble diagnosing.
(1) industrial computer is controlled external equipment such as chopping machine, makes things convenient for tester's test operation;
(2) industrial computer is loaded into automatic test module with test instruction by adaptor module by operation loading autotest program collection thereon, so that provide signals such as correspondent voltage, electric current, excitation to UUT, allows UUT can carry out work;
(3) response signal of UUT output is transferred to automatic test module by adaptor module and carries out data acquisition, the data that collect are transferred to industrial computer by adaptor module carry out follow-up data analysis;
(4) owing to the circuit diagram of audio frequency system ensemble can be found by related Sections in the CMM handbook, so, the user calls in and the consistent circuit diagram of measurand (UUT) by man-machine interface, dependent program in the operating troubles diagnostic software, the dependent program of operating troubles diagnostic software is realized location and diagnosis to fault zone on the faulty board.
Adaptor module is being born the transmission of control signal and data-signal, the work of exchange in whole testing diagnosis equipment.On the one hand, adaptor module is as the interface of industrial computer and automatic test module, and the control signal that industrial computer is produced is transferred to automatic test module, simultaneously, gives industrial computer with the data transmission that automatic test module collects; On the other hand, adaptor module is also as the interface between automatic test module and the UUT, and the various pumping signals that automatic test module is produced are transferred to UUT, and simultaneously, the various response signals that UUT is produced are transferred to automatic test module.
Adaptor module also comprises the test interface interconnecting module, selftest module and power module.The test interface interconnecting module has played the effect of a bridge in test interface adapter and circuit-under-test plate.Because present testing circuit board has polytype communication interfaces such as serial ports, parallel port, USB mouth, so on the test interface keysets, design the interconnecting module of dissimilar communications protocol, can satisfy the requirement of test all-purpose like this, enlarge the scope of testing and diagnosing; Selftest module has played an initialized effect in whole diagnostic platform, when each diagnosis begins, whole diagnostic platform is carried out self check, and self check is not passed through, and this platform can not use; Power module provides power supply to UUT under the instruction of industrial computer and automatic test module.
Automatic test module is that the difference according to tested object can dispose arbitrarily.Can be according to testing requirement, the corresponding bus module of configuration on a series of test specifications such as test speed, measuring accuracy, as: a series of buses such as PXI, LXI, PCI, VXI.Automatic test module is used to produce the required various pumping signals of test, and power supply is managed and controls, and the response signal that UUT is exported converts digital signal to and offers industrial computer analysis simultaneously.
Peripheral module comprises external equipment such as touch-screen, chopping machine, can print the test inventory constantly, makes fault project classification, and it is more reasonable that test assignment is distributed.
According to the above description, can realize the solution of the present invention in conjunction with art technology.
Claims (2)
1. the aircraft audio system ensemble is tested and trouble-shooter automatically, is used to keep in repair Air Passenger series and Boeing series aircraft audio system ensemble, comprises industrial computer, adaptor module, automatic test module and external equipment; It is characterized in that,, provide man-machine interaction environment by industrial computer operation test software, to the data of gathering analyze, calculating and statistical treatment, and then finish trouble diagnosing; Industrial computer, automatic test module be the connection adaptor module respectively, and adaptor module also is provided with the communication interface that connects measurand UUT; Industrial computer is communicated by letter with measurand UUT by the communication interface of adaptor module with automatic test module; Industrial computer and automatic test module controllable adapter module provide power supply to measurand UUT; Described adaptor module comprises test interface interconnecting module, selftest module and power module; Wherein the test interface interconnecting module is made of chip MAX232, chip 74HC245, chip FT245BM and peripheral circuit thereof; Chip MAX232 is connected with Asynchronous Serial Interface, will convert the TTL/CMOS parallel data from the serial data that Asynchronous Serial Interface imports into to by chip MAX232 and import parallel data bus line into; Chip 74HC245 is connected with parallel interface, and as the data buffer of parallel port, 74HC245 imports parallel data into parallel data bus line by chip; Chip FT245BM is connected with USB interface, by chip the data transfer that USB interface imports into is become parallel data, imports parallel data into parallel data bus line; The selftest module of described adaptor module connects expansion eeprom memory, clock circuit, reset circuit, address decoder and watchdog circuit by treater CPU and constitutes, and wherein, CPU comprises ROM, RAM and TIMER, and self-check program is stored among the treater ROM; Selftest module receives discrete variable information and the failure message that comes from automatic test module, and the discrete variable information storage is in RAM, and failure message is stored among the expansion EEPROM; The test interface interconnecting module of described adaptor module is connected with selftest module; Selftest module test interface interconnecting module and automatic test module communication; Described automatic test module is made of digital input-output unit, relay switch matrix, digital versatile table unit, audio signal generator, dynamic signal analysis unit and data collecting card, and automatic test module is accepted the control of autotest program in the industrial computer; Connect with relay coil by the digital quantity output point; Be connected with relay contact by audio signal channel; Constitute audio signal channel by digital input-output unit, relay switch matrix switch; Produce the required various pumping signals of test by audio signal generator; Described automatic test module comes from the response signal of measurand (UUT) output by the data collecting card collection; By digital versatile table unit and dynamic signal analysis unit the data of gathering are carried out " A " weighted filtering, degree of distortion analysis and Analysis signal-to-noise ratio (SNR); Adopt 96 road TTL/CMOS numeral input-output unit; Adopt No. 24 relay switch matrixes; Adopt 6 half word multi-meter unit; Adopt 24 dynamic signal analysis unit.
2. the aircraft audio system ensemble is tested and method for diagnosing faults automatically, is used to keep in repair Air Passenger series and Boeing series aircraft audio system ensemble, it is characterized in that, is undertaken by following order step:
(1) equipment self-inspection; Measurand UUT is linked to each other POST with the automatic test of aircraft audio system ensemble with trouble-shooter;
(2) device initialize; Select to detect type and the piece number and the test event of measurand, hardware and main test program are carried out initialization;
(3) signal loading: by industrial computer operation test software, carry out test instruction, select excitation channel number and pumping signal, be loaded into automatic test module, produce correspondent voltage, electric current, pumping signal and be loaded into the test signal input end of measurand UUT by adaptor module;
(4) data acquisition: measurand UUT is under the pumping signal effect, and output response signal is transferred to automatic test module by adaptor module, and automatic test module is transferred to industrial computer with the digital signal of gathering by adaptor module;
(5) fault judgement: the industrial computer test software calls the fault judgement program, and the digital signal of collection and the ideal value on the manual of maintenance CMM are compared, and judges that the output signal of measurand UUT is disablement signal or qualified signal; If judged result is qualified signal, then on industrial computer, show " test is passed through " information; If judged result is a disablement signal, show that then there is fault in measurand UUT, then enters troubleshooting step;
(6) trouble diagnosing: AMU is divided into five functional modules: power module, interface module, audio processing modules, selective call module and BIT module are carried out trouble diagnosing; According to the value contrast CMM handbook of output signal, failure judgement position; According to the CMM handbook provide all circuit diagrams and the test point information preparation fault diagnostic program of audio frequency system ensemble, at first the circuit to AMU carries out modeling; Call and the corresponding circuit diagram of failure circuit, making up fault dictionary is Mishap Database, calls and the corresponding circuit diagram of failure circuit, and the structure fault dictionary is that the step of Mishap Database comprises:
A, fault implantation step: the operating troubles diagnostic program, power on for tested known fault circuit, gather, inject the data message of known fault in view of the above; Analog logic fault in treating the failure circuit of emulation; Described logic fault is to draw phenomenon of the failure in conjunction with actual service experience; Inject the data message of corresponding failure in view of the above; The probability that breaks down according to element injects the data message of fault;
B, fault simulation step: according to the data message of the fault of injecting, the response of analysis circuit and the detecting information of each test point;
The arrangement step of c, simulation result: will inject data messages such as fault, excitation, response and put in order, and form a failure record in the fault dictionary;
(7) fault diagnostic program comprises position and the corresponding detecting information that provides the test point that needs manual measurement, the testing staff tests the test point that needs manual measurement, the test back is from industrial computer typing dependent failure information, fault diagnostic program is searched fault dictionary according to input information, determine the fault zone, and show corresponding diagnostic result;
(8) judge whether to finish all test events;
(9) finish test.
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