Method for forming diagnostical tests

FIELD: technical systems diagnostics.

SUBSTANCE: method includes forming an equivalent standard model of connections, gaps of which include standard models of composition parts of current type of products, combinations of input signals are set in certain order, parameters of response on outputs of standard model of diagnosed product are determined as well as in characteristic intermediate points between standard models of composition parts of product, values of response parameters together with parameters of test input signals are recorded in database, after which process is repeated until fully searching all states of standard model.

EFFECT: possible forming of tests in absence of standard samples of control subject for different classes of products in different areas.

4 dwg

 

The invention relates to the field of diagnostics of technical systems and can be used for diagnostics of the technical systems (including electronic equipment) of different complexity.

The prior art method of forming a control and diagnostic tests based on the use of pre-measured (reference) samples of controlled products of each type [1].

The essence of this method consists in applying to the inputs of a reference sample of the controlled equipment sets of input signals corresponding to the actual combinations of input signals, for each regular situation (the standard set of input signals) measure the signals appearing at the outputs of the reference sample and the characteristic (control) intermediate points of the reference sample of this type of apparatus, the measured value combinations of the input signals, the values of combinations of the output signals and the values of combinations of signals in the intermediate control points fixed for later use when diagnosing the condition and diagnosis of this type of electronic equipment.

The advantage of this method is adopted for the nearest equivalent is the simplicity of formation diagnostic tests and completeness of the tests, allowing you to further define the th state of the controlled products of this type (according to the principle of good/bad) to match the reference output signals and output signals of the scanned sample of products of this type - for the same combinations of input (test) signals.

The disadvantages of this method is the limited scope, the impossibility of formation tests in the absence of the reference samples and the lack of reliability of tests.

The technical result from the use of the invention is to eliminate the disadvantages of the prototype, namely:

the possibility of formation tests in the absence of reference samples of objects of control;

the ability to generate tests for the claimed method for various classes of products in various subject areas;

improving the reliability of the generated tests.

This technical result is achieved by a method of formation diagnostic tests based on the formation of combinations of input test signals with predetermined combinations of signals with predetermined sequences of input signals corresponding to the input signals during normal working real diagnosable products of this type, and to determine parameters of the combinations of the output signals for each combination of input test signals, characterized in that on the basis of the description of the internal relations of the component parts of this type of products form is equivalent to the reference model is connected to the th (for example, a physical model of the electrical connections diagnosed electronics), breaks equivalent to the reference model compounds include pre-trained reference model component parts of this type of products (for example, physical models of radio electronic elements when modeling diagnosed electronics), set on the inputs received reference model of inspected parts corresponding to combinations of the input signals in the appropriate sequence, reflecting the real time performance of inspected parts, for each combination of the set of input signals determine the parameters of the combinations of the response signals at the outputs of the reference model of the diagnosed device and in typical intermediate points between the reference models of the component parts of the product (for example, after each functional level or cascade scheme diagnosed electronic equipment), are entered by computer parameter values of the response signals received from the output of the reference model and the intermediate points of the standard model diagnostic products, together with the parameters of the corresponding test input signals to the database, repeat the process of applying the input test signals and determination of parameters of equivalent output signals to full pereb the RA all States of the reference model diagnostic products, the generated set of input test signals and associated criteria equivalent output signals are used to diagnose the condition of real products and Troubleshooting component parts of the product.

The practical implementation of the method is illustrated in figure 1-4.

Figure 1 is conventionally depicted electronic circuit, which are branched by the input logic circuit, having in its composition 6 radio electronic elements (marked on figure 1 legend Y1,...,Y6). Devices1and I6represent the input and output connectors. Devices2,...,Y5represent the corresponding logical integrated circuits (logical functions shown within the contours of the designations of these devices in the diagram Fig 1).

Conventionally depicted in figure 2 diagram of the electrical connections between the contacts of the devices In1,...,Y6. The implementation of the electrical connections under this scheme in the form of electrical conductors between the respective contacts will be a physical model of the electrical connections of the products presented on figure 1.

The internal properties of each active device (Y2,...,Y5), part of the products 1, can be represented by an equivalent functional and models. In this case, functions of devices included in the product 1, can be characterized by the following descriptions of logic functions:

where: a1;2signals on input pins (1, 2) devices In2,3and I4;

and5- signal on the output pins 5 devices At2,3and I5;

in1;3;4signals on input pins (1, 3, 4) devices4;

in5the signal on output pin 5 devices4.

Device models2,...,Y5should the functions and parameters are fully consistent with the properties and parameters of the real devices of the same type.

Figure 3 is conventionally shown the inclusion of device models2...Y5in the appropriate places in the model electrical connections figure 2, in result we have a fully functional model circuit apparatus 1, for the diagnosis of which requires the formation of the tests.

Figure 4 shows the circuit model of figure 3 to form tests of the claimed method. The forming unit tests 1 running from the computer 2 generates combinations of input signals corresponding to standard input signals of the apparatus 1. Generated input signals are fed to the inputs of the standard model 3 (figure 3). Response reference model 3 for each comb the nation test input signals will manifest itself in the form of a combination of the output signals at the output (outputs) model 3, which are fixed by the definition block of the response signals 4. The signal response for each combination of input tests are recorded in the computer memory 2 (together with the corresponding input tests) and serve as criteria codes for subsequent evaluation of normal functioning of this type of equipment (figure 1). Simultaneously with the latching of the output signals of the block definition of the response signals 4 captures the signal parameters of the response model 3 product 3 from the outputs of the device models2,3,4(which is the intermediate control points scheme 1). These combinations of signals (in relation to the relevant input parameters tests) are the criteria of the health of the preceding parts of the controlled circuit. They are used in the future for Troubleshooting controlled equipment. For example, failure At5in the scheme 1 will be reflected in the fact that measured in the diagnosis of the actual device response signals at the circuit output 1 (pin 2 of connector Y6) will not coincide with the criterion values of the response signals diagnostic test product 1, and the serviceability of the preceding devices (2,3,4) will be confirmed by the coincidence of the measured signals at the output of the device At4with criterial diagnostically and signals for a given intermediate point, obtained when forming the diagnostic criteria according to the scheme 4 model-based figure 3.

Thus, the claimed method of forming tests enables model-based equipment to obtain accurate diagnostic tests, allowing to produce as diagnostics of the General condition of the controlled device (pass/fail), and fault diagnosis of the controlled device (with the exact determination of the location of the fault).

The claimed method provides equally the formation of diagnostic tests based on physical models (models electrical connections, models of component parts of equipment)and appropriate mathematical models. With the essence of the method and its effectiveness does not depend on the method of implementation models.

As physical models of the component parts of the product (smpeg) in the formation of diagnostic tests can be used selected accordingly (reference) actual structural components (for example, electroradiographic relevant types of integrated circuits, transistors, diodes, resistors, etc. with options in the middle of the field tolerance to diagnose electronic products).

As blocks 1 generating test signals (n is redstavleny figure 4) in the case of diagnostic objects in the form of electronic equipment (figure 1) can be used corresponding to the generators of code combinations, the pulse generators, signal generators, special forms, etc. known from the prior art. As blocks 4 define the parameters of the response signals can be used digital oscilloscopes, logic analyzers, signature analyzers, spectrum analyzers and other appropriate measuring device known from the prior art.

In the case of using a mathematical model blocks 1, 3, 4 (figure 4) is implemented within the computer 2 in the form of appropriate software products, adequate to their physical equivalents.

Literature

1. Reliability and efficiency in the technique. The guide 10 so v.9. Technical diagnostics. Edited VLV, M.: Mashinostroenie, 1987, s-178.

The method of formation diagnostic tests based on the formation of combinations of input test signals with predetermined combinations of signals with predetermined sequences of input signals corresponding to the input signals during normal working real diagnosable products of this type, and to determine parameters of the combinations of the output signals for each combination of input test signals, characterized in that on the basis of the description of the internal parts of this type of products form is equivalent to the reference model compounds, which breaks the equivalent of the standard model compounds include pre-trained reference model component parts of this type of products, set on the inputs received reference model of inspected parts corresponding to combinations of the input signals in the appropriate sequence, reflecting the real time performance of inspected parts, for each combination of the set of input signals determine the parameters of the combinations of the response signals at the outputs of the reference model of the diagnosed device and in typical intermediate points between the reference models of the component parts of the product are entered by computer parameter values of the response signals received from outputs of the reference model and the intermediate points of the standard model diagnostic products, together with the parameters of the corresponding test input signals to the database, repeat the process of applying the input test signals and determination of parameters of equivalent output signals to full iterate through all the States of the standard model diagnostic products, formed a set of input test signals and associated criteria equivalent output signals are used to diagnose the condition of real products and Troubleshooting component parts of products.



 

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