JP2003316434A - Failure diagnosis apparatus, method therefor and its program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a failure diagnosis apparatus, a failure diagnosis method and a failure diagnosis program capable of utilizing expert knowledge and using it generally to a variety of oil and air pressure circuits. <P>SOLUTION: The apparatus comprises: a circuit configuration means (13) for specifying and storing mutual relations of parts in response to a plurality of operating methods for the oil and air pressure circuits; status acquiring means (17, 19) for acquiring and storing deeds of oil and air pressure configuration parts indicated by using qualitative values; a prediction means (18) for predicting deeds of other oil and air pressure configuration parts on the pressure circuits, by using a qualitative prediction when each of the oil and the air pressure configuration parts is failed; a diagnosis means (20) for extracting configuration parts having potential for being in failures by comparing between statuses of the oil and the air pressure configuration parts and the deeds of the other oil and air configuration parts; and a display means (2) for displaying names of the extracted configuration parts along with contents of those failures. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil / pneumatic circuit constructed by combining a plurality of oil / pneumatic components.
The present invention relates to a failure diagnosis technology for automatically diagnosing a failed hydraulic / pneumatic component.

[0002]

2. Description of the Related Art Generally, an oil / pneumatic circuit is constructed by combining various kinds of oil / pneumatic components. Therefore, when a failure occurs in the oil / pneumatic circuit, it is necessary to identify the cause of the failure. Takes a lot of time.

Conventionally, experienced maintenance personnel who are familiar with the equipment and specialists who have a high degree of knowledge about the operation of the hydraulic / pneumatic circuit can shorten the failure time by grasping the cause of the failure. I was trying. However, in a situation where the number of skilled engineers and specialized engineers in each manufacturing industry is decreasing due to the recent industrial structure change, it takes a considerable time to recover from a failure.

On the other hand, the production equipment is becoming more sophisticated and complicated year by year, and as a result, the production activity is greatly affected by the equipment stoppage due to a failure.

For this reason, the development of a technique capable of identifying the cause of a failure in a short time is in progress even if it is not a skilled engineer or a specialist engineer. The invention disclosed in Japanese Unexamined Patent Publication No. 8-226411 compares a candidate device of a failure cause, which is extracted on the basis of a failure phenomenon that has occurred, with a past failure case stored in advance to infer the failed device. To identify. As a result, it is possible to quickly infer the failure-causing device even for the failure cause peculiar to a specific device.

[0006]

However, the invention disclosed in Japanese Unexamined Patent Publication No. 8-226411 requires a past failure case base created in advance, so that a failure that has not occurred in the past can be performed. There is a problem that the inference accuracy is not good.

Further, the structure of the oil / pneumatic circuit is different depending on the function and capacity of the production equipment in which it is used. Therefore, when the past failure case base is used, the failure case base must be created for each equipment. The number of oil / pneumatic circuits used in manufacturing plants is large, and it is not uncommon to have several hundreds of hydraulic circuits. Therefore, it is necessary to create a case base in which past failures are investigated for each oil / pneumatic circuit, and there is a problem that much effort is required to create the case base.

Further, there is also a problem that the past case base cannot be applied as it is in many cases when the corresponding oil / pneumatic circuit is updated or modified.

The present invention has been made in view of the above circumstances, and it is possible to utilize the knowledge of a specialist in oil / pneumatic circuits, and to use it for various oil / pneumatic circuits in general. An object of the present invention is to provide a failure diagnosis device, a failure diagnosis method, and a failure diagnosis program that can be performed.

[0010]

SUMMARY OF THE INVENTION To solve the above problems, the present invention relates to a plurality of operating methods during operation of an oil / pneumatic circuit, in which the oil / pneumatic components relating to the flow of the working fluid are mutually related. Circuit configuration means for identifying and storing the relationship between
State acquisition means for acquiring and storing behaviors in a plurality of states including failure states of oil / pneumatic components, which are expressed using qualitative values regarding physical quantities of working fluid before and after pneumatic components, and a plurality of operating methods Based on the mutual relationship between the hydraulic / pneumatic components related to the flow of the working fluid and the behavior in multiple states including failure states of the hydraulic / pneumatic components, which are expressed using qualitative values, Inference means for estimating the behavior of other hydraulic / pneumatic components on the circuit corresponding to each pressure component failure using qualitative inference, and the hydraulic / pneumatic configuration including the actual failure situation Diagnostic means for extracting oil / pneumatic components that may have a failure based on the situation of the parts and the behavior of other oil / pneumatic components estimated by qualitative inference, and the possibility of the extracted failure. Certain hydraulic / pneumatic components A fault diagnosis apparatus and display means for displaying together with the contents of the failure name.

Further, the present invention corresponds to a plurality of operating methods at the time of operating the oil / pneumatic circuit, and a circuit configuration for specifying and storing a mutual relation of the hydraulic / pneumatic components regarding the flow of the working fluid. Means and state acquisition means for acquiring and storing behavior in a plurality of states including a failure state of the oil / pneumatic component represented by using a qualitative value regarding a physical quantity of the working fluid before and after the oil / pneumatic component, and , And the behaviors in multiple states including the failure states of the hydraulic / pneumatic components expressed using qualitative values and the mutual relationship of the hydraulic / pneumatic components related to the flow of the working fluid corresponding to multiple operating methods. Based on the inference means that uses qualitative inference to estimate the behavior of other hydraulic / pneumatic components on the circuit corresponding to the failure of each hydraulic / pneumatic component based on the Hydraulic / pneumatic components Extract the oil / pneumatic components that may have a failure and the oil / pneumatic components that have no possibility of failure from the situation and the behavior of other hydraulic / pneumatic components estimated by qualitative inference. Diagnosis to extract oil / pneumatic components that have a high possibility of failure by excluding oil / pneumatic components that have no possibility of failure within the extraction means and oil / pneumatic components that may have a failure A failure diagnosis device comprising means and display means for displaying the name of the extracted hydraulic / pneumatic component having a high possibility of failure together with the details of the failure.

The present invention also relates to a plurality of operating methods when the oil / pneumatic circuit is in operation, corresponding to a plurality of operating methods, and a circuit constituting means for specifying and storing a mutual relationship between the oil / pneumatic components relating to the flow of the working fluid. State acquisition means for acquiring and storing behaviors in a plurality of states including failure states of the oil / pneumatic components, which are expressed by using qualitative values regarding the physical quantity of the working fluid before and after the oil / pneumatic components, Oil based on the mutual relationship between the hydraulic / pneumatic components related to the flow of the working fluid corresponding to the operating method and the behavior in multiple states including the failure state of the hydraulic / pneumatic components expressed using qualitative values.・ Inference means for estimating the behavior of other hydraulic / pneumatic components on the circuit corresponding to the failure of each pneumatic component using qualitative inference, and the actual failure for each of the plurality of operating methods Situation From the situation of the included oil / pneumatic components and the behavior of other oil / pneumatic components estimated by qualitative inference, the oil / pneumatic components with a possibility of failure are extracted and Diagnostic means for extracting the extracted oil / pneumatic components as oil / pneumatic components with a high possibility of failure in all cases, and the names of the extracted oil / pneumatic components with a high possibility of failure And a display means for displaying together with the details of the failure.

According to the present invention, in the failure diagnosing device according to the above-mentioned invention, the reasoning means is such that the failure of the hydraulic / pneumatic component is in a direction opposite to the direction in which the hydraulic oil flows on the circuit corresponding to the operating method. Is a failure diagnosis device equipped with a higher-order inference means for executing qualitative inference upstream when it influences other hydraulic / pneumatic components arranged upstream.

According to the present invention, in the failure diagnosing device according to the above-mentioned invention, the display means ranks hydraulic / pneumatic components having a possibility of failure by past failure history and fragility of the parts. It is a failure diagnosis device provided with a means for performing.

Further, the present invention provides the failure diagnosis apparatus according to the above-mentioned invention, wherein the color of the path of the working fluid flowing on the oil / pneumatic circuit corresponds to the operating method, and the working oil / pneumatic configuration includes an actuator. It is a failure diagnosis device having graphic display means for displaying the hydraulic / pneumatic circuit graphic changed before and after a component.

The present invention also includes a circuit configuration step for identifying and storing the mutual relationship between the oil / pneumatic components relating to the flow of the working fluid, corresponding to a plurality of operating methods during operation of the oil / pneumatic circuit. A state acquisition step of acquiring and storing behavior in a plurality of states including a failure state of the oil / pneumatic component, which is expressed by using a qualitative value relating to the physical quantity of the working fluid before and after the oil / pneumatic component; Oil based on the mutual relationship between the hydraulic / pneumatic components related to the flow of the working fluid corresponding to the operating method and the behavior in multiple states including the failure state of the hydraulic / pneumatic components expressed using qualitative values. An inference step that uses qualitative inference to estimate the behavior of other oil / pneumatic components on the circuit corresponding to the failure of each pneumatic component, and the oil / air condition including the actual failure status. Pressure composition There is a diagnostic step to extract oil / pneumatic components that may have a failure from the situation of the product and the behavior of other oil / pneumatic components estimated by qualitative inference, and the possibility of the extracted failure. And a display step for displaying the name of a certain hydraulic / pneumatic component together with the details of the failure.

In the fault diagnosing method according to the invention as described above, the inferring step may be performed in a direction opposite to the direction in which the hydraulic fluid flows on the circuit in which the fault of the hydraulic / pneumatic component corresponds to the operating method. Other oil placed upstream
It is a fault diagnosis method including a higher-order inference step that executes qualitative inference upstream when it affects pneumatic components.

Further, according to the present invention, a circuit configuration for identifying and storing in the computer the mutual relationship between the hydraulic / pneumatic components relating to the flow of the working fluid, corresponding to a plurality of operating methods during the operation of the hydraulic / pneumatic circuit. Procedure, state acquisition procedure for acquiring and storing behavior in multiple states including failure states of oil / pneumatic components expressed using qualitative values relating to physical quantities of working fluid before and after hydraulic / pneumatic components, multiple Based on the relationship between the hydraulic / pneumatic components related to the flow of the working fluid corresponding to the operating method and the behavior in multiple states including the failure state of the hydraulic / pneumatic components expressed using qualitative values When each of the hydraulic / pneumatic components fails, an inference procedure for estimating the behavior of other hydraulic / pneumatic components on the corresponding circuit using qualitative inference, the oil / pneumatic condition including the actual failure situation Pressure component Situation and the behavior of other oil / pneumatic components estimated by qualitative inference, the diagnostic procedure to extract oil / pneumatic components that may have a failure, the extracted oil with a possible failure A program for executing a display procedure for displaying the name of the pneumatic component together with the details of the failure.

According to the present invention, in the failure diagnosis program according to the invention described above, the inference procedure is such that the failure of the hydraulic / pneumatic component is in a direction opposite to the direction in which the hydraulic oil flows on the circuit corresponding to the operating method. It is a fault diagnosis program having a higher-level inference procedure that executes qualitative inference upstream when it affects other hydraulic / pneumatic components arranged upstream.

[0020]

1 is a diagram showing a configuration of an equipment failure diagnosis system using an equipment failure diagnosis device according to the present invention.

This equipment failure diagnosis system is an equipment failure diagnosis apparatus 1 for diagnosing a failure of an oil / pneumatic circuit, and an input / output apparatus for inputting / outputting information between the equipment failure diagnosis apparatus 1 and an operator. 2, and a factory terminal 4, a maintenance terminal 5, and a construction terminal 5, which are external terminals connected to the equipment failure diagnosis apparatus 1 via the communication line 3 to use the functions of the equipment failure diagnosis apparatus 1.

The equipment failure diagnosis device 1 includes an input / output control unit 11, a navigation unit 12, and a system creation unit 1.
3, a qualitative simulation unit 16, a failure diagnosis unit 20, and a data storage unit 23.

The input / output control unit 11 is an interface for exchanging various kinds of information with an external terminal or the like connected to the communication line 3. The navigation unit 12 is an interface for providing each function of the equipment failure diagnosis device 1 according to an operation command from each external terminal.

The system creating unit 13 creates an oil / pneumatic circuit model to be diagnosed by arranging the components and creates an oil / pneumatic circuit creating unit 14, and whether the created oil / pneumatic circuit model is appropriate. A flow simulation unit 15 for inspecting whether or not it is provided.

The qualitative simulation unit 16 inputs the data representing the normal state and the abnormal state of each component so that the qualitative inference can be carried out, based on the inputted state data of each component. A qualitative inference unit 18 that infers the behavior of the oil / pneumatic circuit, and a failure database creation unit 19 that creates a failure database used for failure diagnosis based on the inference result are provided.

The failure diagnosing section 20 diagnoses a component causing the failure based on an abnormal operating state of the oil / pneumatic circuit.

The data storage unit 23 is used for the equipment failure diagnosis device 1.
Stores various data required for the above process. In the data storage unit 23, a component data memory 24 that stores data relating to components used for creating an oil / pneumatic circuit model, a switching state or an operating state of a component for each operation mode of the created circuit model. A circuit configuration data memory 25 for storing the above, a component state data memory 26 for storing state data indicating a normal state / abnormal state for each component,
A behavior data memory 27 that stores the behavior of the entire hydraulic / pneumatic circuit for each normal / abnormal state of the component, a failure data memory 28 that stores data that associates the abnormal operating status of the hydraulic / pneumatic circuit with the cause of failure, And a failure history data memory 29 that stores a failure history for each component.

Then, a factory terminal 4 connected to the communication line 3
Is a terminal provided in a manufacturing factory that uses the oil / pneumatic circuit as a part of production equipment, and is mainly used by an operator of the manufacturing factory. The maintenance terminal 5 uses the oil
This terminal is provided in the pneumatic circuit maintenance department and is mainly used by maintenance personnel. The construction terminal 5 is a terminal provided in a department in charge of repairing / maintaining the oil / pneumatic circuit, and is mainly used by a specialist in the oil / pneumatic circuit.

Here, the communication line is a route widely used for transmitting and receiving information, and is not limited to communication using a wire such as a conductive wire and an optical fiber, but also wireless communication using light, sound waves, radio waves, etc. included.

Next, the operation of the equipment failure diagnosis system will be described. In the following description, the hydraulic circuit is targeted, and the input / output device 2 is exclusively used to perform the operation input for instructing the equipment failure diagnosis device 1 to operate.

When using this equipment failure diagnosis system,
First, it is necessary to input the configuration of the hydraulic circuit to be diagnosed to the equipment failure diagnosis device 1. Therefore, when an operator of the system inputs an instruction to create a hydraulic circuit model from the input / output device 2, the navigation unit 12 receives the input and activates the system creating unit 13.

FIG. 2 is a flow chart showing a schematic operation procedure of the system creating section 13. Oil of system creation unit 13
The pneumatic circuit generator 14 is activated to display the parts menu shown in FIG. 3 on the input / output device 2 and prompt the operator to select a necessary item (S1).

From this parts menu, the operator
When the "flow control valve" is selected, the oil / pneumatic circuit creation unit 14 searches the component data memory 24 and displays the icon group of the flow control valve shown in FIG. 4 (S2). Here, the displayed icon is, in principle, a symbol represented by the Japanese Industrial Standard “Diagram for hydraulic pressure and pneumatic pressure”.

In this system, not only the graphic symbols specified in the Japanese Industrial Standards but also a plurality of hydraulic / pneumatic devices are arranged in one block, and a predetermined function is obtained by combining the plurality of blocks. It is also configured to be able to handle a laminated type device (for example, a laminated valve, etc.) that composes an oil / pneumatic device.

When the operator selects a group of parts necessary for constructing the hydraulic circuit model and then clicks and drags the icon with a mouse or the like, the hydraulic / pneumatic circuit creation unit 1
4 arranges the constituent parts in the workspace according to the operation of the operator (S3). FIG. 5 shows a state in which the components are arranged.

Next, when the operator designates the connection state of the component parts in the workspace, the oil / pneumatic circuit creation unit 14
Displays the piping that connects the specified components as shown in FIG. 6 (S4).

Then, the operator performs an operation mode setting operation.

Here, the operation mode is a function required for the hydraulic circuit, and for example, in the hydraulic circuit model shown in FIG. 6, there are two operations of "forward" mode and "reverse" mode, which are cylinder operations. Have a mode. When the operator gives an instruction to set the operation mode and inputs it together with the operation mode name, the hydraulic / pneumatic circuit creation unit 14 displays the operation condition input screen shown in FIG. 7 (S5).

The operator inputs the state of each component in the operation mode, for example, the open / closed state of each valve and the excited state according to the displayed screen. Further, it is also possible to appropriately add an explanatory text for clearly indicating the state of the component, such as a hydraulic pressure value and an oil amount. Then, when the input of the operating conditions is completed, the hydraulic / pneumatic circuit creation unit 14 then displays the ending condition input screen shown in FIG. 8 (S6).

According to the displayed screen, the operator inputs the state of each component at the end of the operation mode, for example, the state of the actuator, and performs "OK" operation when all the inputs are completed. The flow simulation unit 15 is activated to inspect the created hydraulic circuit (S7).

The flow simulation section 15 inspects whether or not the hydraulic circuit model is properly constructed for each operation mode. Specifically, there are disconnection of piping, presence / absence of unset items, and the like. And if the test result is good,
The created hydraulic circuit model is stored and registered in the circuit configuration data memory 25 together with its operation mode (S8).

Next, various failure states generated in the hydraulic circuit model thus created are input to create a failure database for diagnosing failures. Prior to that, qualitative inference according to the present invention is performed. The method used will be described.

In general, it is difficult to construct a quantitative model of a complex object. Therefore, a method called qualitative inference that simply predicts only the qualitative behavior of the object has been proposed. There is.

In qualitative inference, the variables are 3
Express by value.

X = [+]; increase, rise, etc. X = [0]; no change, normal, etc. X = [-]; decrease, fall, etc. FIG. 9 is a diagram showing a model of the valve. In this model, the valve input is the inlet pressure Pin and the inlet flow rate Fin, and the valve output is the outlet pressure Pout and the outlet flow rate Fou.
t. Then, the differential pressure (pressure loss) due to the valve is d
Assuming P, the model used for the qualitative inference of this valve is expressed by equations (1) to (3).

DP = Pin−Pout (1) Fin = dP (2) Fout = Fin (3) In these equations, each variable takes three values which are the qualitative values of the above qualitative inference, and the equal sign. Indicates that they are equal in the meaning of these three values. Here, the physical meaning of equation (2) is
The relation derived from Bernoulli's theorem, that is, the input flow rate Fi
It means that n is proportional to the square root of the differential pressure dP.

A model based on this equation can express the qualitative behavior of the valve. For example, it is expressed as follows.

Pin = [+]: Inlet pressure increase dP = [+]: Differential pressure increase Fin = [+]: Inlet flow rate increase Fout = [+]: Outlet flow rate increase Pout = [+]: Outlet pressure increase This behavior Indicates that when the inlet pressure rises, the differential pressure rises, the flow rate flowing into the valve increases, the flow rate flowing out of the valve increases, and the outlet pressure rises.

The behavior of this valve is expressed by equations (1) to
By applying (3), it is also expressed as follows.

Pout = [+]: Outlet pressure increase dP = [-]: Differential pressure decrease Fin = [-]: Inlet flow rate decrease Fout = [-]: Outlet flow rate decrease Pin = [+]: Inlet pressure increase behavior Indicates that when the outlet pressure increases, the differential pressure decreases, the flow rate flowing into the valve decreases, the flow rate flowing out of the valve decreases, and the inlet pressure increases.

Thus, from Pin, Fin to Pou
t, Fout can be estimated, and conversely, Pout, Fout
Pin and Fin can be estimated from out. Therefore, a model formula that describes the above relationship for each component that constitutes the hydraulic circuit is created, and changes due to the variable fluid pressure and flow rate passing through the component are calculated using the above qualitative inference. To do. Then, it is possible to easily estimate the behavior of the target by repeating the execution of the qualitative inference of the next component based on the result and propagating the inference results one after another.

When the operator of the system inputs an instruction to create a failure database from the input / output device 2, the navigation unit 12 receives the input and activates the qualitative simulation unit 16.

FIG. 10 is a flow chart showing a schematic operation procedure of the qualitative simulation section 16. The component state input unit 17 of the qualitative simulation unit 16 is activated, and a display prompting the operator to register the state data for the components forming hydraulic pressure in the input / output device 2 is displayed (S10).

FIG. 11 is a diagram showing state data for the operating check valve. The operator must first register the "directional control valve" in the "hydraulic element device" as the part to be registered.
Enter that it is an "operate check valve" that belongs to. Then, Pin, Fin, Pout, and Fout, which are qualitative inference variables for this operation check valve.
Describe the state using a qualitative value and enter.

The contents input here are normal / abnormal states of the operating check valve. For example, "internal leak", "clogging", "control flow impossible", "external leak", etc. can be listed as abnormal states. .

The component status input unit 17 acquires variable data for each normal / abnormal state described using qualitative values for each component, and stores this data in the component status data memory 29 (S11). ). Here, the created component state data is used for general purpose when qualitative inference is performed by the equipment failure diagnosis device 1.

Next, when the operator designates a hydraulic circuit from the input / output device 2 and inputs an instruction to execute qualitative inference, the qualitative simulation unit 16 activates the qualitative inference unit 18. The qualitative inference unit 18 reads out the designated hydraulic circuit and operation mode from the circuit configuration data memory 25, and reads out the state data of each component used in the hydraulic circuit from the component state data memory 29 (S12).

First, one operation mode of the hydraulic circuit is selected and processing is performed based on that operation mode (S13). Then select one of the components used in the hydraulic circuit,
Further, one abnormal state is selected (S14). Then, the behavior of the part is simulated using qualitative inference (S1).
5).

FIG. 12 is a flow chart showing the procedure of qualitative inference. The selected part is set as a starting point part for qualitative inference (T1), and abnormal state data is set as the initial value in the starting point part (T2). Then, assuming that a failure has occurred in this starting point component, the propagation of the qualitative value using qualitative inference is started in accordance with the connection of the hydraulic components corresponding to the operation mode (T3). In the following description, the flow direction of hydraulic oil according to the operation mode is referred to as the downstream, and the reverse direction is referred to as the upstream.

First, qualitative inference is applied to the component (T4), and then it is checked whether or not the component to which the qualitative inference is applied has a fault that should affect upstream (T5). Normally, the qualitative inference is sequentially applied toward the downstream component and processed, but depending on the type of failure, the effect may reach the upstream component. For example, when a component arranged downstream of the cylinder is clogged, the cylinder that is the upstream component is slowed down, resulting in an abnormality.

Therefore, when a fault that should affect the upstream side has occurred (T5 yes), upper propagation processing (backtrack processing) for performing qualitative inference in the opposite direction to the above is executed (T6). This backtracking process
The qualitative inference is executed upstream, but the processing is terminated when the components having a structure that does not propagate upstream are traced back.

After the backtrack processing, the process returns to the lower component and checks whether or not there is a component that propagates the qualitative value downstream according to the path of the circuit (T7). If there is the corresponding component (T7). Yes) moves to the processing of the component (T8), and steps T5 to T7 are repeated. If there is no corresponding component (T7 no), the qualitative inference ends.

FIG. 13 is a diagram showing an example of an estimation result by qualitative inference. The figure shows the estimation result when an abnormality occurs in the component V2 and the state becomes "high pressure". According to this, the component 5 is in the "high speed rotation" state,
The component n enters the "low speed rotation" state. Incidentally, the parts 4 and 6
Are parts that are not used in this operating mode. In this example, the words “high-speed rotation” and “low-speed rotation” are used instead of the above-mentioned “+”, “0”, and “−”. It can be realized by associating it with a word indicating the state of the component. By associating in this way, it becomes easy for a non-hydraulic expert to understand the failure state / operation state of the component parts.

The qualitative inference unit 18 stores the estimation result thus obtained in the behavior data memory 27 (S1).
6). Then, it is checked whether or not the qualitative inference is completed for all the states of all the parts (S17), and if there are still parts to be processed and abnormal states to be processed (S17).
17 no) repeats steps S14 to S16.

If the qualitative inference for all states of all parts is completed (S17 yes), it is checked whether or not the qualitative inference for all operation modes is completed (S1).
8) If the operation mode to be processed still remains (S18 no), steps S13 to S17 are repeated. Then, when the qualitative inference for all the operation modes is completed (S18 yes), the qualitative inference for this hydraulic circuit is completed.

In this embodiment, the state data is stored in the component state data memory 29, but the present invention is not limited to this form. For example, even if the state data is incorporated into a program and used. good. By incorporating it in the program, it is possible to shorten the data access time and keep the secret of these data, which is know-how.

Then, the failure database creating section 19 is activated to create a failure database for specifying the cause of the failure.

Now, considering the case where a failure occurs in the hydraulic circuit, what a person can recognize as a "failure" is that the state can be observed from the outside, such as the "mechanical movement" of the target part cannot be obtained. Because. Therefore, among the components of the hydraulic circuit, a component that can be recognized as a failure is selected as a target component, and the behavior data is reconfigured using the operation of the target component as a key item.

Therefore, the failure database creating section 19
The behavior data memory 27 is read, and an abnormal state is extracted for the target component designated in advance by the operator (S
19). For example, when a cylinder is targeted, abnormal state data of a component that causes a malfunction of the cylinder is extracted from the behavior data.

Then, the failure database creating section 19 creates a failure database showing the correspondence between the target part and each component based on this data (S20). FIG. 14 shows the structure of the failure database created in this way.

Next, a method of diagnosing various failures that occur in the hydraulic circuit using the equipment failure diagnosis device 1 will be described. When the operator designates a hydraulic circuit from the input / output device 2 and inputs an instruction to execute a failure diagnosis, the navigation unit 1
2 receives the instruction and activates the failure diagnosis unit 20.

FIG. 15 is a flow chart showing a schematic procedure of the failure diagnosis section 20 according to the first embodiment of the present invention.

The fault diagnosis unit 20 is the circuit configuration data memory 2
5, the circuit configuration of the hydraulic circuit to be diagnosed and the inquiry dialog for failure diagnosis are displayed on the input / output device 2
(S30). FIG. 16 is a diagram showing the configuration of the hydraulic circuit to be diagnosed, and FIG. 17 is a diagram showing the configuration of the inquiry dialogue 35.

When the operator inputs the operation mode in the operation mode column 36 of the inquiry dialog 35, inputs the abnormal state of the target part in the operation state column 37, and operates the execute button 39, the failure diagnosis section 20 detects them. Data is acquired and the fault data memory 28 is searched (S31). Then, the abnormality content of the target component in the operation mode is checked from the stored failure database, and the component that causes the relevant abnormal state is extracted (S32).

Next, the failure diagnosis section 20 checks the failure history data memory 29. The failure history data memory 20 stores data such as past failure history of the equipment and life of the component parts. The failure diagnosis unit 20 can cause failure of the extracted component parts based on this data. The ranking is performed in the descending order (S33). Then, in accordance with this order, the names of constituent parts which may cause the trouble and the details of the abnormality are displayed on the input / output device 2 (S34).

FIG. 18 is a diagram showing the names of abnormal parts and the causes of abnormalities as a result of diagnosis. In this way, since the component names are displayed in the order of high possibility of failure, the cause of failure can be more easily estimated. It should be noted that the above-described ordering is not performed, and the names of the component parts that may cause the failure are displayed, and the component parts that cause the failure are highlighted on the circuit of FIG. It may be configured to. Further, it may be configured such that the display is changed in color, blinking, etc. after the above ranking is performed.

FIG. 19 is a flow chart showing a schematic procedure of the failure diagnosis section 20 according to the second embodiment of the present invention. In the second embodiment, the same functions and parts as those in the first embodiment are referred to by the same reference numerals, and detailed description thereof will be omitted.

The fault diagnosis section 20 performs steps S30 to S30.
According to the procedure of 32, the components that cause the corresponding abnormal state are extracted and displayed. Then, when the operator refers to the displayed component name and wants to further increase the certainty factor regarding the failure-occurring component (S35 yes), the operator selects the operation mode of the inquiry dialog 35 shown in FIG. The other operation mode is input in the column 36, the abnormal state of the component is input in the operation state column 37, the reference column 38 of the other operation mode is checked, and the execute button 39 is operated.

The fault diagnosis unit 20 acquires these data (S36), searches the fault data memory 28, and checks the stored fault database for the abnormality content of the target component in the other operation modes, The component that causes the abnormal state is extracted (S37). Then, the components common to the failure states of the respective operation modes are extracted and displayed from the plurality of search results (S3).
8).

FIG. 20 is a view showing the abnormal part name and the cause of the diagnosis as a result of the diagnosis. The components that are presumed to be abnormal are narrowed down. By thus configuring to refer to another operation mode, it is possible to obtain a highly accurate diagnostic result.

FIG. 21 is a flow chart showing a schematic procedure of the failure diagnosis section 20 according to the third embodiment of the present invention. In the third embodiment, the same functions and parts as those in the first embodiment are referred to by the same reference numerals, and detailed description thereof will be omitted.

The failure diagnosis section 20 performs steps S30 to S30.
According to the procedure of 32, the components that cause the corresponding abnormal state are extracted and displayed. Then, when the operator wants to further increase the certainty factor regarding the failure-causing part by referring to the displayed component name (S40 yes), the operator selects the operation mode of the inquiry dialog 35 shown in FIG. The other operation mode is input in the column 36, and "normal" is input in the state of the component in the operation state column 37. Then, the reference column 38 of the other operation mode is checked and the execute button 39
To operate.

The fault diagnosis section 20 acquires these data (S41), searches the behavior data memory 27, and extracts the components used in other operation modes from the stored behavior database. Then, this component is excluded from the components that cause the abnormal state and displayed (S42).

By thus configuring so as to refer to the normal state of another operation mode, it is possible to obtain a highly accurate diagnosis result as in the second embodiment. Furthermore,
The third embodiment can be configured by combining it with the first and second embodiments. With this configuration, it is easier to use and highly accurate diagnostic results can be obtained.

As a failure diagnosis support function, in the equipment failure diagnosis device 1, in order to facilitate identification of the route through which a medium such as hydraulic oil or air flowing on the hydraulic circuit flows in accordance with the operation mode, a color is drawn. I am trying to display it by replacement. For example, in the circuit shown in FIG. 16, the route through which pressure oil reaches the actuator is displayed in “red” color, and the subsequent route is automatically displayed in “blue” color. By doing so, the route to be examined becomes clear even in the case of a circuit having a complicated configuration, and it is further effective in identifying a defective component.

In the equipment failure diagnosis system described in this embodiment, the equipment failure diagnosis device 1 is connected to a plurality of terminals via communication lines, but the present invention is not limited to this form. The equipment failure diagnosis device 1 is configured as a portable type device using a notebook computer or the like so that a maintenance staff in charge of diagnosis and maintenance or an operator in a factory carries the equipment failure diagnosis device 1 and uses it. May be.

The embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem described in the section of the problem to be solved by the invention can be solved, and the effect described in the section of the effect of the invention can be solved. When the above is obtained, the configuration in which this constituent element is deleted can be extracted as the invention.

[0088]

According to the present invention, it is possible to utilize the knowledge of the expert of the oil / pneumatic circuit, and to obtain a failure diagnostic device which can be used universally for various oil / pneumatic circuits. .

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an equipment failure diagnosis system using an equipment failure diagnosis device according to the present invention.

FIG. 2 is a flowchart showing a schematic operation procedure of a system creation unit.

FIG. 3 is a diagram showing a parts menu.

FIG. 4 is a diagram showing a group of icons of a flow control valve.

FIG. 5 is a view showing a state in which constituent parts are arranged.

FIG. 6 is a view showing a state in which constituent parts are connected to each other.

FIG. 7 is a diagram showing an operating condition input screen.

FIG. 8 is a diagram showing an end condition input screen.

FIG. 9 is a diagram showing a model of a valve.

FIG. 10 is a flowchart showing a schematic operation procedure of a qualitative simulation unit.

FIG. 11 is a diagram showing state data of an operating check valve.

FIG. 12 is a flowchart showing the procedure of qualitative inference.

FIG. 13 is a diagram showing an example of an estimation result by qualitative inference.

FIG. 14 is a diagram showing a configuration of a failure database.

FIG. 15 is a flowchart showing a schematic procedure of a failure diagnosis unit according to the first embodiment of the present invention.

FIG. 16 is a diagram showing a configuration of a hydraulic circuit to be diagnosed.

FIG. 17 is a diagram showing the configuration of an inquiry dialog.

FIG. 18 is a diagram showing an abnormal part name and an abnormal cause of a diagnosis result.

FIG. 19 is a flowchart showing a schematic procedure of a failure diagnosis section according to the second embodiment of the present invention.

FIG. 20 is a view showing an abnormal part name and an abnormal cause of a diagnosis result.

FIG. 21 is a flowchart showing a schematic procedure of a failure diagnosis unit according to the third embodiment of the present invention.

[Explanation of symbols]

1. Equipment failure diagnosis device 2 ... I / O device 13 ... System creation department 14 ... Oil / pneumatic circuit creation unit 15 ... Flow simulation section 16 ... Qualitative simulation part 17 ... Component status input section 18 ... Qualitative reasoning section 19 ... Failure database creation section 23 ... Data storage unit 24 ... Component data memory 25 ... Circuit configuration data memory 26 ... Component status data memory 27 ... Behavior data memory 28 ... Failure data memory 29 ... Failure history data memory

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Claims (10)

[Claims] 1. A failure diagnosis device for diagnosing a failure of an oil / pneumatic circuit formed by combining a plurality of oil / pneumatic components, which corresponds to a plurality of operating methods when the oil / pneumatic circuit is in operation. Then, a circuit configuration means for specifying and storing a mutual relationship between the oil / pneumatic components regarding the flow of the working fluid, and a table using qualitative values regarding physical quantities of the working fluid before and after the oil / pneumatic components are shown. State acquisition means for acquiring and storing behaviors in a plurality of states including a failure state of the hydraulic / pneumatic component, and the hydraulic / pneumatic component regarding the flow of the working fluid corresponding to the plurality of operating methods. When each of the oil / pneumatic components fails, based on the mutual relationship of the above, and the behavior in a plurality of states including the failure state of the oil / pneumatic components represented using the qualitative value. Times corresponding to Inference means for estimating the behavior of other hydraulic / pneumatic components on the road using qualitative inference, conditions of the hydraulic / pneumatic components including actual failure conditions, and estimation by the qualitative inference Of the oil / pneumatic components having a possibility of failure from the comparison with the behavior of the oil / pneumatic components of FIG. A failure diagnosis device comprising: a display unit that displays the name together with the details of the failure. 2. A failure diagnosis device for diagnosing a failure of an oil / pneumatic circuit formed by combining a plurality of oil / pneumatic components, which corresponds to a plurality of operating methods when the oil / pneumatic circuit is in operation. Then, a circuit configuration means for specifying and storing a mutual relationship between the oil / pneumatic components regarding the flow of the working fluid, and a table using qualitative values regarding physical quantities of the working fluid before and after the oil / pneumatic components are shown. State acquisition means for acquiring and storing behaviors in a plurality of states including a failure state of the hydraulic / pneumatic component, and the hydraulic / pneumatic component regarding the flow of the working fluid corresponding to the plurality of operating methods. When each of the oil / pneumatic components fails, based on the mutual relationship of the above, and the behavior in a plurality of states including the failure state of the oil / pneumatic components represented using the qualitative value. Times corresponding to Inference means for estimating the behavior of other hydraulic / pneumatic components on the road using qualitative inference, conditions of the hydraulic / pneumatic components including actual failure conditions, and estimation by the qualitative inference In comparison with the behavior of oil / pneumatic components, the extraction means for extracting oil / pneumatic components with a possibility of failure and oil / pneumatic components with no possibility of failure, and the possibility of failure Diagnostic means for excluding oil / pneumatic components that have a high possibility of failure by excluding oil / pneumatic components that have no possibility of failure among the possible oil / pneumatic components, And a display unit for displaying the name of the hydraulic / pneumatic component having a high possibility of failure together with the content of the failure. 3. A failure diagnosis device for diagnosing a failure of an oil / pneumatic circuit formed by combining a plurality of oil / pneumatic components, which corresponds to a plurality of operating methods when the oil / pneumatic circuit is activated. Then, a circuit configuration means for specifying and storing a mutual relationship between the oil / pneumatic components regarding the flow of the working fluid, and a table using qualitative values regarding physical quantities of the working fluid before and after the oil / pneumatic components are shown. State acquisition means for acquiring and storing behaviors in a plurality of states including a failure state of the hydraulic / pneumatic component, and the hydraulic / pneumatic component regarding the flow of the working fluid corresponding to the plurality of operating methods. When each of the oil / pneumatic components fails, based on the mutual relationship of the above, and the behavior in a plurality of states including the failure state of the oil / pneumatic components represented using the qualitative value. Times corresponding to Inference means for estimating the behavior of other hydraulic / pneumatic components on the road using qualitative inference, and the situation of the hydraulic / pneumatic components including actual failure conditions for each of the multiple operating methods. From the comparison with the behavior of other hydraulic / pneumatic components estimated by the qualitative inference, the hydraulic / pneumatic components with a possibility of failure are extracted,
For all cases of the plurality of operating methods, a diagnostic means for extracting the extracted oil / pneumatic component as an oil / pneumatic component having a high possibility of failure, and the possibility of the extracted failure being high. A failure diagnosis apparatus comprising: a display unit that displays the name of the hydraulic / pneumatic component together with the details of the failure. 4. The inference means is configured such that the failure of the hydraulic / pneumatic component is the other hydraulic / pneumatic element arranged upstream in a direction opposite to the direction in which the hydraulic oil flows on the circuit corresponding to the operating method. The fault diagnosis apparatus according to any one of claims 1 to 3, further comprising a higher-order reasoning unit that executes qualitative reasoning upstream when the pressure component is affected. . 5. The display means comprises means for ranking the hydraulic / pneumatic components having the possibility of failure according to past failure history and fragility of the parts. 1. The failure diagnosis device according to 1. 6. The color of the path of the working fluid flowing on the oil / pneumatic circuit is changed before and after the working oil / pneumatic component including an actuator according to the operating method.
The fault diagnostic device according to any one of claims 1 to 5, further comprising graphic display means for displaying a pneumatic circuit graphic. 7. A failure diagnosing method for a failure diagnosing device for diagnosing a failure of an oil / pneumatic circuit constituted by combining a plurality of oil / pneumatic components. Corresponding to the operating method, a circuit configuration step of identifying and storing the mutual relationship of the hydraulic / pneumatic components relating to the flow of the working fluid, and a qualitative value relating to the physical quantity of the working fluid before and after the hydraulic / pneumatic components. The state acquisition step of acquiring and storing the behavior in a plurality of states including the failure state of the hydraulic / pneumatic component represented by using the above-mentioned oil related to the flow of the working fluid corresponding to the plurality of operating methods. Each of the hydraulic / pneumatic components is based on the mutual relationship between the pneumatic / pneumatic components and the behavior in a plurality of states including the failure state of the hydraulic / pneumatic components represented using the qualitative value. Because An inference step of estimating the behavior of other hydraulic / pneumatic components on the circuit corresponding to the case of failure using qualitative inference, and the condition of the hydraulic / pneumatic component including the actual failure condition, A diagnostic step of extracting an oil / pneumatic component having a possibility of failure from the comparison with the behavior of other oil / pneumatic component estimated by the qualitative inference, and the possibility of the extracted failure And a display step for displaying the name of the hydraulic / pneumatic component together with the details of the failure. 8. The inferring step comprises the other oil / air component arranged upstream, in which the failure of the oil / pneumatic component component is in a direction opposite to the direction in which the hydraulic oil flows on the circuit corresponding to the operating method. 8. The fault diagnosis method according to claim 7, further comprising a higher-order inference step for executing qualitative inference upstream when the pressure component is affected. 9. A failure diagnosis program for a failure diagnosis device for diagnosing a failure of an oil / pneumatic circuit composed of a combination of a plurality of oil / pneumatic components, wherein a computer is configured to detect when the oil / pneumatic circuit is activated. A circuit configuration procedure for identifying and storing the mutual relationship between the hydraulic / pneumatic components relating to the flow of the working fluid, and the physical quantity of the working fluid before and after the hydraulic / pneumatic components. A state acquisition procedure for obtaining and storing behavior in a plurality of states including a failure state of the oil / pneumatic component, which is expressed using a qualitative value, and the oil relating to the flow of the working fluid corresponding to the plurality of operating methods. The hydraulic / pneumatic component based on the mutual relationship of the pneumatic components and the behavior in a plurality of states including the failure state of the hydraulic / pneumatic component expressed using the qualitative value. If each of them fails, the inference procedure for estimating the behavior of other hydraulic / pneumatic components on the corresponding circuit using qualitative inference, the status of the hydraulic / pneumatic components including the actual failure status And a diagnostic procedure for extracting an oil / pneumatic component having a possibility of failure from the comparison with the behavior of other oil / pneumatic component estimated by the qualitative inference, and the possibility of the extracted failure is A program for executing a display procedure for displaying the name of a hydraulic / pneumatic component together with the details of the failure. 10. The inference procedure is such that the failure of the hydraulic / pneumatic component is another hydraulic / pneumatic component arranged upstream in a direction opposite to the flow direction of hydraulic fluid on the circuit corresponding to the operating method. 10. The fault diagnosis program according to claim 9, further comprising a higher order inference procedure for executing qualitative inference upstream when the pressure component is affected.