JP2019199817A - Failure diagnosis system and failure diagnosis method - Google Patents

Abstract

To suppress erroneous detection in abnormality diagnosis of an apparatus.SOLUTION: A failure diagnosis system includes a sensor for detecting a state quantity relating to an operation state of a thermal fluid apparatus, and a diagnosis portion for diagnosing a possibility of abnormality in the thermal fluid apparatus on the basis of a result of detection by the sensor. The diagnosis portion is constituted to diagnose presence/no presence of abnormality in the thermal fluid apparatus or the sensor on the basis of at least one of a change direction or an amount of change of the operation state acquired by outputting a signal for finely changing the state quantity in diagnosing the possibility of abnormality in the thermal fluid apparatus.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a failure diagnosis system and a failure diagnosis method.

  Conventionally, a technique for remotely monitoring the state of a device is known.

  For example, in Patent Document 1, a parameter to be monitored and an allowable tolerance for the parameter are determined, and the parameter is synchronized between the machine system and the monitoring system. Techniques for monitoring conditions are disclosed. In the monitoring system disclosed in Patent Document 1, when the tolerance defined in advance is different from the parameter, the mechanical system notifies the fact.

JP 2003-202916 A

However, when a device abnormality is simply diagnosed based on the above parameters acquired via a sensor, there is a problem in that there are many false detections due to sensor failures or individual differences between devices. Such erroneous detection due to sensor failure or individual difference between devices is often not solved even if diagnosis is performed after a certain period of time, unlike erroneous detection due to communication failure.
In this regard, Patent Document 1 does not disclose any specific configuration for solving the above-described problem.

  In view of the above-described problems, at least one embodiment of the present disclosure aims to suppress erroneous detection in an abnormality diagnosis of a device.

(1) A fault diagnosis system according to at least one embodiment of the present disclosure includes:
A sensor for detecting a state quantity relating to the operating state of the thermofluid device;
A diagnosis unit for diagnosing the possibility of abnormality of the thermal fluid device based on the detection result of the sensor,
When the diagnosis unit diagnoses that the thermal fluid device has the possibility of abnormality, the diagnosis unit outputs at least one of the change direction or the change amount of the state quantity obtained by outputting a signal for minutely changing the state quantity. Based on this, it is configured to diagnose whether there is an abnormality in the thermal fluid device or the sensor.

  According to the configuration of (1) above, when it is diagnosed that there is a possibility of abnormality in the thermofluid device based on the detection result of the sensor, a signal for minutely changing the state quantity of the thermofluid device by the diagnosis unit Based on the change direction or the change amount of the state quantity obtained by the output, it can be determined whether the sensor is abnormal. If the direction or amount of change of the state quantity acquired after the output of the signal is different from the instruction content of the signal, it is determined that the sensor is abnormal. Otherwise, it is determined that there is no problem with the sensor and the thermal fluid device is abnormal. obtain. By performing an internal check of the sensor in this way, it is possible to suppress erroneous detection in the abnormality diagnosis of the thermofluid device due to a sensor failure or the like. Therefore, the prediction accuracy of the abnormality diagnosis of the thermofluid device can be improved.

(2) In some embodiments, in the configuration described in (1) above,
The signal may include a command for changing the state quantity in a predetermined direction according to the type of the state quantity.

  According to the configuration of (2) above, the state quantity can be changed in a predetermined direction according to the type of the state quantity. That is, for example, since the possibility of abnormality of the thermal fluid device or sensor can be diagnosed by minutely changing the state quantity to the safe side, the state quantity related to the operating state of the thermal fluid equipment is not changed to the dangerous side. The possibility of abnormality can be diagnosed.

(3) In some embodiments, in the configuration described in (1) or (2) above,
The diagnostic unit may be configured to output the signal via a controller for controlling the operating state of the thermal fluid device.

  According to the configuration of (3) above, when it is diagnosed that there is a possibility of abnormality in the thermal fluid device based on the detection result of the sensor, a signal for minutely changing the state quantity is transmitted from the diagnostic unit via the controller. Output to the device. By transmitting the signal through the controller in this way, for example, it is possible to realize the presence or absence of abnormality of the sensor in consideration of the control conditions of the thermofluid device by the controller.

(4) In some embodiments, in the configuration according to any one of (1) to (3) above,
The diagnostic unit compares the state quantity detected by the sensor with a threshold value that defines a range of the state quantity when the thermal fluid device is normal, and diagnoses the possibility of abnormality of the thermal fluid device. It may be configured.

  According to the configuration of (4) above, the presence or absence of abnormality of the thermofluid device is diagnosed by comparing the state amount detected by the sensor with a threshold value that defines the range of the state amount of the thermofluid device at normal time. . That is, when the state quantity detected by the sensor exceeds the threshold value so as to deviate from the state quantity range at the normal time, it may be determined that there is a possibility that the thermal fluid device may be abnormal. Thus, by comparing with the threshold value of the state quantity range in the normal state, it is possible to improve the diagnosis accuracy of the possibility of abnormality of the thermofluid device based on the input from the sensor.

(5) In some embodiments, in the configuration according to any one of (1) to (4) above,
The diagnostic unit
Having individual initial data for each thermofluidic device with respect to the state quantity;
Comparing at least one of the change direction or the change amount of the state quantity obtained by outputting the signal with the initial data, it is configured to diagnose the presence or absence of abnormality of the thermal fluid device or the sensor. May be.

  According to the configuration of the above (5), the change direction or amount of the state quantity obtained by attempting a minute change in the state quantity, and initial data (for example, data at the time of shipment) specific to each thermal fluid device regarding the state quantity. ), It is possible to eliminate the individual difference of the thermal fluid device and improve the detection accuracy of the abnormality of the thermal fluid device or the sensor.

(6) In some embodiments, in the configuration according to any one of (1) to (5) above,
The failure diagnosis system includes a storage unit,
The diagnostic unit
When the thermal fluid device is diagnosed as having no possibility of abnormality, the signal is output to acquire the change direction or the change amount of the state quantity when the thermal fluid device is normal, and store it in the storage unit.
The change direction or change amount of the state quantity acquired by outputting the signal when diagnosing the thermal fluid device as having the possibility of abnormality, and the change direction of the state quantity stored in the storage unit or the It may be configured to diagnose whether there is an abnormality in the thermal fluid device or the sensor by comparing the amount of change.

  According to the configuration of (6) above, even when there is no possibility of abnormality in the thermofluid device, that is, when it is diagnosed as normal, the state quantity is intentionally minutely changed and the reaction is stored in the storage unit. Thus, the sensitivity of the sensor can be periodically grasped. As a result, it is possible to determine the presence / absence of abnormality of the thermal fluid device by eliminating the temporal change of the sensor output, so that the detection accuracy of the presence / absence of abnormality can be further improved.

(7) In some embodiments, in the configuration described in (6) above,
The diagnostic unit
When it is diagnosed that the thermal fluid device is not likely to be abnormal, it is determined whether a certain cycle has elapsed since the previous comparison with the change direction or the change amount of the thermal fluid device at the normal time,
When it is determined that the predetermined cycle has elapsed, the comparison with the change direction or the change amount at the normal time may be performed.

  According to the configuration of (7) above, it is possible to periodically and repeatedly execute the process of grasping the sensor sensitivity at the normal time and storing it in the storage unit. Therefore, the latest information regarding the sensitivity of the sensor in consideration of changes with time can be stored in the storage unit. As a result, when it is diagnosed that there is a possibility of abnormality in the thermofluid device, the change direction or change amount obtained by minutely changing the state quantity is reflected in the information reflecting the latest sensor sensitivity stored in the storage unit. Therefore, it is possible to further improve the determination accuracy of the presence or absence of abnormality of the thermal fluid device.

(8) In some embodiments, in the configuration according to any one of (1) to (7) above,
The thermofluid device may include any one of an engine, a boiler, and a gas turbine.

  According to the configuration of (8) above, in the failure diagnosis system including any one of an engine, a boiler, and a gas turbine as the thermal fluid device, the benefits described in any of the above can be enjoyed.

(9) In some embodiments, in the configuration according to any one of (1) to (8) above,
When the diagnosis unit diagnoses that there is an abnormality in the thermal fluid device based on the change direction or the change amount of the state quantity obtained by outputting the signal, the diagnosis unit is specified from the type of the state quantity indicating an abnormality. It may be configured to output an instruction for eliminating the abnormality of the part to be removed.

  According to the configuration of (9) above, when the diagnosis unit diagnoses that there is an abnormality in the thermal fluid device, an instruction for eliminating the abnormality is output. For example, depending on the content of the abnormality of the part diagnosed as abnormal, ordering parts for replacement or repair, arranging workers for maintenance work such as cleaning, etc. should be executed in a timely manner by the diagnosis unit Can do. Therefore, it is possible to smoothly cope with the abnormality while reducing the burden of initial response when the abnormality occurs.

(10) In some embodiments, in the configuration according to any one of (1) to (9) above,
The failure diagnosis system includes:
When the diagnosis unit diagnoses that there is an abnormality in the thermal fluid device or the sensor, a notification unit may be provided to notify the fact.

  According to the configuration of (10) above, when it is diagnosed that there is an abnormality in the thermal fluid device or the sensor, the fact is notified by the notification unit. Therefore, since the operator of the thermofluid device can quickly grasp that an abnormality has occurred in the thermofluid device or sensor, it is possible to prompt a smooth initial response to the abnormality.

(11) A failure diagnosis method according to at least one embodiment of the present disclosure includes:
Detecting a state quantity related to the operating state of the thermofluid device with a sensor;
Diagnosing the presence or absence of abnormality of the thermal fluid device based on the detection result of the sensor;
Outputting a signal for minutely changing the state quantity when it is diagnosed that there is a possibility of abnormality in the thermal fluid device in the diagnosing step;
Obtaining a change direction or a change amount of the state quantity according to the output of the signal;
Diagnosing the presence or absence of abnormality of the thermal fluid device or the sensor based on at least one of the acquired change direction or the change amount;
It has.

  According to the above method (11), as described in (1) above, by performing an internal check of the sensor, it is possible to suppress erroneous detection of abnormality of the thermofluid device due to sensor failure or the like. Therefore, the prediction accuracy of the abnormality diagnosis of the thermofluid device can be improved.

(12) In some embodiments, in the method according to (11) above,
In the step of diagnosing the presence or absence of the possibility of abnormality,
By comparing the state quantity detected by the sensor with a threshold value that defines a range of the state quantity when the thermal fluid device is normal, the presence or absence of the abnormality possibility of the thermal fluid device may be diagnosed. .

  According to the method of (12) above, as described in (3) above, by comparing the state quantity detected by the sensor with a threshold value that defines the range of the state quantity of the thermofluid device at normal time, The presence or absence of abnormality in the thermofluid device is diagnosed. That is, when the state quantity detected by the sensor exceeds the threshold value so as to deviate from the state quantity range at the normal time, it may be determined that there is a possibility that the thermal fluid device may be abnormal. Thus, by comparing with the threshold value of the state quantity range in the normal state, it is possible to improve the diagnosis accuracy of the possibility of abnormality of the thermofluid device based on the input from the sensor.

(13) In some embodiments, in the method according to (11) or (12) above,
In the step of diagnosing the presence or absence of abnormality of the thermal fluid device or the sensor,
By comparing at least one of the change direction or the change amount of the state quantity obtained by outputting the signal with individual initial data for each of the thermofluid equipment with respect to the state quantity, The presence or absence of abnormality of the sensor may be diagnosed.

  According to the method of (13) above, as described in (5) above, each thermofluid device with respect to the direction or amount of change of the state quantity obtained by trying a minute change of the state quantity and the state quantity. By comparing the initial data (for example, the data at the time of shipment) unique to each, it is possible to eliminate the individual difference of the thermal fluid device and improve the detection accuracy of the abnormality of the thermal fluid device or the sensor.

(14) In some embodiments, in the method according to any one of (11) to (13) above,
The failure diagnosis method includes:
A step of outputting the signal when the thermofluid device is diagnosed as having no possibility of abnormality, obtaining a change direction or a change amount of the state quantity when the thermofluid device is normal, and storing it in a storage unit; Prepared,
In the step of diagnosing the presence or absence of abnormality of the thermal fluid device or the sensor,
The change direction or the change amount of the state quantity acquired by outputting the signal when the thermofluid device is diagnosed as having the possibility of abnormality, and the change of the state quantity stored in the storage unit The presence or absence of abnormality of the thermofluid device or the sensor may be diagnosed by comparing the direction or the amount of change.

  According to the method of (14), as described in (6) above, even when there is no possibility of abnormality in the thermofluid device, that is, when it is diagnosed as normal, the state quantity is intentionally changed minutely. By storing the reaction in the storage unit, it is possible to periodically grasp the sensitivity of the sensor. As a result, it is possible to determine the presence / absence of abnormality of the thermal fluid device by eliminating the temporal change of the sensor output, so that the detection accuracy of the presence / absence of abnormality can be further improved.

(15) In some embodiments, in the method according to any one of (11) to (14) above,
The failure diagnosis method includes:
When it is diagnosed that there is an abnormality in the thermal fluid device based on the change direction or the change amount of the state quantity acquired by outputting the signal, the region specified by the type of the state quantity indicating the abnormality You may provide the step which outputs the instruction | indication for eliminating the said abnormality.

  According to the method (15), as described in (9) above, when the diagnosis unit diagnoses that there is an abnormality in the thermofluid device, an instruction for eliminating the abnormality is output. For example, depending on the content of the abnormality of the part diagnosed as abnormal, ordering parts for replacement or repair, arranging workers for maintenance work such as cleaning, etc. should be executed in a timely manner by the diagnosis unit Can do. Therefore, it is possible to smoothly cope with the abnormality while reducing the burden of initial response when the abnormality occurs.

  According to at least one embodiment of the present disclosure, erroneous detection in device abnormality diagnosis can be suppressed.

It is a block diagram which shows the structural example of the failure diagnosis system which concerns on one Embodiment. It is a block diagram which shows the structural example of the failure diagnosis system which concerns on other embodiment. It is a flowchart which shows the abnormality diagnosis process in the failure diagnosis system which concerns on one Embodiment. It is a flowchart which shows the abnormality diagnosis process in the failure diagnosis system which concerns on other embodiment. It is a flowchart which shows the abnormality diagnosis process in the failure diagnosis system which concerns on other embodiment. It is a flowchart which shows the abnormality diagnosis process in the failure diagnosis system which concerns on other embodiment.

  Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the following embodiments are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 1 is a block diagram illustrating a configuration example of a failure diagnosis system according to at least one embodiment of the present disclosure.
As illustrated in a non-limiting manner in FIG. 1, the failure diagnosis system 1 according to at least one embodiment of the present disclosure includes a sensor 30 for detecting a state quantity related to an operation state of the thermal fluid device 5, and detection of the sensor 30. And a diagnostic unit 10 for diagnosing the possibility of abnormality of the thermal fluid device 5 based on the result.

  The thermal fluid device 5 is a device in which at least a thermal fluid flows, and may include, for example, a plant device such as a combustion apparatus including a boiler or a gas turbine in addition to an internal combustion engine such as an engine. That is, the operations and effects described in the present disclosure can be enjoyed in the failure diagnosis system 1 including the engine, boiler, or gas turbine as the thermal fluid device 5.

  The sensor 30 detects various state quantities related to the operating state of the thermal fluid device 5 and outputs detection signals to the diagnosis unit 10. A plurality of such sensors 30 may be provided according to the number of parameters to be monitored. For example, when an engine is applied as the thermal fluid device 5, the parameter to be monitored may include, for example, the pressure or temperature of each of the air supply, exhaust, or lubricating oil, or the engine speed. That is, the sensor 30 is, for example, a supply air pressure sensor, an exhaust pressure sensor, a lubricating oil pressure sensor, an intake air temperature sensor, an exhaust gas temperature sensor, a lubricating oil temperature sensor, an engine speed sensor, an in-cylinder pressure sensor, an in-cylinder temperature sensor, or the like. Can be included.

The diagnosis unit 10 diagnoses whether or not there is a possibility that an abnormality has occurred in the thermal fluid device 5. Examples of such a diagnosis unit 10 include a remote monitoring center that remotely monitors the presence or absence of abnormality of the thermal fluid device 5, an abnormality diagnosis system that is installed locally (for example, a factory-installed type or a vehicle-mounted type), and the like. Surveillance systems can be included.
In the case of a monitoring system by a remote monitoring center, it is possible to detect a sign as an abnormality before a serious failure occurs and to prevent the failure by changing the control of the device. In this case, even if an abnormality is detected, it is not necessary to stop the operation immediately. On the other hand, it is not possible to cope with the problem simply by changing the control of the device, and it may be necessary to perform on-site maintenance. In addition, the remote monitoring center may only acquire device information at regular intervals, and it may be difficult to control the device in real time.

Next, details of the diagnosis unit 10 in at least one embodiment of the present disclosure will be described.
As illustrated in a non-limiting example in FIG. 1, the diagnosis unit 10 may be, for example, a computer, and serves as a storage unit for storing data such as a CPU 11, various programs executed by the CPU 11, and a reference table. A ROM (Read Only Memory) 13, a RAM (Random Access Memory) 12 functioning as a work area which is a development area and a calculation area when executing each program, and a communication unit 50 (communication interface) for connecting to a communication network I / F), a hard disk drive (HDD) as a large-capacity storage device (not shown), an access unit to which an external storage device is mounted, and the like may be provided. These can all be connected via the bus 14.

  The diagnosis unit 10 may include various databases 17 as a storage unit, and the database 17 may store various tables 18 for performing abnormality diagnosis of the thermal fluid device 5, for example. Furthermore, the diagnosis unit 10 may be connected to, for example, an input unit (not shown) including a keyboard and a mouse, a display unit (not illustrated) including a liquid crystal display device that displays data, and the like.

  The diagnosis unit 10 may receive a state quantity detection signal related to the operating state of the thermal fluid device 5 from a sensor 30 provided in the thermal fluid device 5.

  In the ROM 13, an abnormality diagnosis program for the diagnosis unit 10 to diagnose an abnormality in the embodiment of the present disclosure (for example, including the diagnosis of the presence or absence of abnormality of the thermal fluid device 5 or the abnormality of the sensor 30 described later). 15 may be stored. In some embodiments, the CPU 11 reads the abnormality diagnosis program 15 from the ROM 13, develops it in the RAM 12, and executes it, whereby the abnormality diagnosis process described in the present disclosure can be realized.

  Furthermore, when the diagnosis unit 10 in at least one embodiment of the present disclosure diagnoses that there is a possibility of abnormality in the thermal fluid device 5, the diagnosis unit 10 outputs a signal for minutely changing the state quantity related to the operation state of the thermal fluid device 5. The thermal fluid device 5 or the sensor 30 is diagnosed for an abnormality based on at least one of the change direction or the change amount of the state quantity acquired in this way. Such processing can be realized, for example, by the CPU 11 reading and executing the abnormality diagnosis program 15.

In some embodiments, the controller 2 may be configured to control the operating state of the thermal fluid device 5 (see FIG. 1). In this case, the controller 2 can be configured to control the operation of each thermal fluid device 5 in an integrated manner. As such a controller 2, for example, when an engine is applied as the thermal fluid device 5, an ECU (Engine control unit) that controls the operating state of the engine in response to a user request may be included.
The diagnostic unit 10 can be configured to output a signal via the controller 2. In addition, the diagnosis unit 10 may acquire the change direction or the change amount of the state amount after the minute change from the controller 2 or directly from the sensor 30.

  According to the above configuration, when it is diagnosed that there is a possibility of abnormality in the thermal fluid device 5 based on the detection result of the sensor 30, a signal for minutely changing the state quantity is transmitted from the diagnostic unit 10 via the controller 2. It is output to the device 5. By transmitting a signal through the controller 2 in this way, for example, diagnosis of the presence or absence of abnormality of the sensor 30 can be realized in consideration of the control conditions of the thermal fluid device 5 by the controller 2.

  As the state quantity, that is, the parameter to be changed (subject of minute change), for example, when an engine is applied as the thermal fluid device 5, in addition to the above-described supply air pressure, the ignition timing of the plug, the fuel injection timing, EGR ( An exhaust gas recirculation rate, a variable capacity (VG) supercharger opening, or a WG (waste gate) valve opening may be included.

  Such a minute change of the parameter can be used as a function for controlling the thermofluid device 5 originally provided in the controller 2. Therefore, not only can the cost be reduced, but the diagnostic unit 10 does not need to directly control the thermal fluid device 5 in real time.

  In some embodiments, when performing the abnormality diagnosis process described above, the diagnosis unit 10 first diagnoses whether there is an abnormality in the sensor 30 and the state quantity detected by the sensor 30 and when the thermal fluid device 5 is normal. It may be configured to diagnose the possibility of abnormality of the thermal fluid device 5 by comparing with a threshold value that defines the range of the state quantity. Such processing can be realized, for example, by the CPU 11 reading the abnormality diagnosis program 15 and executing abnormality diagnosis processing. Note that the threshold value in this case is appropriately determined by presetting or acquiring a range of various state quantities during normal operation of the thermal fluid device 5, and stored in a storage unit such as the ROM 13 or the database 17. Also good.

  For example, when the engine is applied as the thermal fluid device 5 and the state quantity detected by the sensor 30 exceeds a predetermined threshold value, there is a possibility that the thermal fluid device 5 may be abnormal. The direction and amount of change in the output of the sensor 30 are intentionally grasped by outputting a signal that slightly changes the operating state while maintaining a range that satisfies the user's request for the number and engine output. Thus, it can be configured to check whether an abnormality has actually occurred in the thermal fluid device 5 or whether the sensor 30 has failed.

  In some embodiments, the signal for minutely changing the state quantity may include a command for changing the state quantity in a predetermined direction according to the type of the state quantity.

  For example, when an engine is applied as the thermal fluid device 5 and the ignition timing of the spark plug is adopted as a parameter to be changed, the diagnosis unit 10 outputs a signal for slightly delaying (retarding) the ignition timing. This is because if the ignition timing is advanced (advance), there may be a risk of exceeding the maximum pressure in the cylinder due to knocking, engine damage, etc. Therefore, to avoid such a risk, change the parameter to be changed on the safe side. Is a minute change. Moreover, the change to the direction which can avoid the NOx increase at the time of advance, and can observe exhaust gas regulation is employ | adopted. The state quantity change detected by the minute change (that is, the output of the sensor 30) can include, for example, an increase in exhaust gas temperature, an increase in supercharger rotation speed, or an increase in supply air pressure.

  Further, when the engine is applied as the thermal fluid device 5 and, for example, the VG opening of the supercharger is adopted as the parameter to be changed, the diagnosis unit 10 outputs a signal for changing the VG opening in the opening direction. . This means that if the VG opening is changed in the closing direction, the parameter to be changed is slightly changed to the safe side in order to avoid the risk of engine damage due to excess of the maximum cylinder pressure due to a sudden rise in the supply air pressure. Is. The state quantity change detected by the minute change (the output of the sensor 30) can include, for example, a decrease in the turbocharger rotation speed and a decrease in the supply air pressure.

  As described above, according to the configuration in which the state quantity is changed in a predetermined direction according to the type of the state quantity, for example, even if the abnormality itself cannot be resolved by minutely changing the state quantity to the safe side. Any possibility of abnormality of the thermal fluid device 5 or the sensor 30 can be safely diagnosed.

In some embodiments, the diagnosis unit 10 may include a database 17 as a storage unit, and may have individual initial data for each thermal fluid device 5 regarding the state quantity (see, for example, FIG. 1).
As such initial data, for example, when an engine is applied as the thermal fluid device 5, various data included in individual operation data at the time of shipment of the engine may be included.
Then, the diagnosis unit 10 compares the initial data with at least one of the change direction or the change amount of the state quantity obtained by outputting the signal for the minute change, and whether there is an abnormality in the thermal fluid device 5 or the sensor 30 May be configured to diagnose. Such processing can be realized, for example, by the CPU 11 reading and executing the abnormality diagnosis program 15.

  As described above, according to the configuration in which the diagnosis unit 10 has individual initial data in each thermal fluid device 5, regarding the change direction or the change amount of the state amount obtained by trying the minute change of the state amount, and the state amount. By comparing individual initial data (for example, data at the time of shipment) for each thermal fluid device 5, individual differences of the thermal fluid device 5 are eliminated, and abnormality detection accuracy of the thermal fluid device 5 or the sensor 30 is improved. Can be made.

FIG. 2 is a block diagram illustrating a configuration example of a failure diagnosis system according to another embodiment.
As illustrated in a non-limiting example in FIG. 2, in some embodiments, the diagnosis unit 10 may detect that the thermal fluid device 5 has an abnormality based on a change direction or a change amount of a state quantity acquired by outputting a signal. When a diagnosis is made, an instruction for eliminating the abnormality of the part specified from the type of state quantity indicating the abnormality may be output (see FIG. 6). Such processing can be realized, for example, by the CPU 11 reading and executing the abnormality diagnosis program 15.

Moreover, the diagnosis part 10 may be provided with the alerting | reporting part 40 which alert | reports that when the diagnosis part 10 diagnoses that there exists abnormality in the sensor 30 (refer FIG. 2).
Thus, according to the structure provided with the alerting | reporting part 40, when it diagnoses that there is abnormality in the sensor 30, the alerting | reporting part 40 alert | reports that. In the case of an abnormality in the sensor 30, there may be a case where recovery is simpler than an abnormality in the thermal fluid device 5, and the operator of the thermal fluid device 5 can quickly grasp that an abnormality has occurred in the sensor 30, Since it can be determined whether or not the abnormality of the sensor 30 can be solved by itself, an appropriate initial response to the abnormality can be promoted.

  Further, when the diagnosis unit 10 diagnoses that there is no possibility of abnormality in the thermal fluid device 5, the diagnosis unit 10 outputs the above signal and acquires the change direction or the change amount of the state quantity when the thermal fluid device 5 is normal, and serves as a storage unit. The database 17 may be updated. That is, the change direction or change amount of the state quantity obtained by outputting a signal when diagnosing that there is a possibility of abnormality in the thermal fluid device 5, and the change direction or change of the state quantity updated in the storage unit (database 17) You may be comprised so that the abnormality of the thermofluid apparatus 5 or the sensor 30 may be diagnosed by comparing quantity. Such processing can be realized, for example, by the CPU 11 reading and executing the abnormality diagnosis program 15.

  According to the configuration in which the database 17 is updated as described above, even when there is no possibility of abnormality in the thermal fluid device 5, that is, when it is diagnosed as normal, the state quantity is intentionally minutely changed and the reaction is stored. By storing in the database 17 as a unit, the sensitivity of the sensor 30 can be periodically grasped. As a result, it is possible to determine the presence / absence of abnormality of the thermal fluid device 5 by eliminating the change with time of the sensor 30 output, so that the detection accuracy of the presence / absence of abnormality can be further improved.

Next, a failure diagnosis method according to at least one embodiment of the present disclosure, which is abnormality diagnosis processing by the diagnosis unit 10 that has executed the abnormality diagnosis program 15 described above, will be described with reference to FIG.
FIG. 3 is a flowchart showing an abnormality diagnosis process in the failure diagnosis system according to the embodiment. As illustrated in a non-limiting manner in FIG. 3, the fault diagnosis method according to at least one embodiment of the present disclosure includes a step (step S <b> 10) of detecting a state quantity related to an operation state of the thermal fluid device 5 with the sensor 30, and a sensor In the step of diagnosing the possibility of abnormality of the thermofluid device 5 based on the detection results of 30 (step S20), and in the step of diagnosis S20, it is diagnosed that the thermofluid device 5 is likely to be abnormal (step S20: YES), a step of outputting a signal for minutely changing the state quantity (step S30), a step of obtaining the change direction or amount of the state quantity according to the signal output (step S40), and the obtained change A step of diagnosing the presence or absence of abnormality of the thermal fluid device 5 or the sensor 30 based on at least one of the direction and the amount of change (step S50).
Then, in the diagnosis unit 10, when the change direction or the change amount of the state quantity detected according to the minute change is a normal change as intended by the signal output from the diagnosis unit 10 (step S50: YES). On the other hand, it is determined that the thermal fluid device 5 is abnormal (step S60). On the other hand, when the change direction or the change amount of the state quantity corresponding to the minute change is not a normal change as intended by the signal output from the diagnosis unit 10 (step S60). S50: NO) determines that the sensor 30 is abnormal (step S70), and ends the process.
As described above, the diagnosis unit 10 can detect the abnormality of the sensor 30 in addition to the abnormality of the thermal fluid device 5.
When it is diagnosed that there is no abnormality in step S20 (step S20: NO), the process proceeds to step S10 and the process of monitoring (detecting) the state quantity related to the operating state of the thermal fluid device 5 is repeatedly executed.

  According to the above method, when it is diagnosed that there is a possibility of abnormality in the thermal fluid device 5 based on the detection result of the sensor 30, a signal for minutely changing the state quantity of the thermal fluid device 5 by the diagnostic unit 10. Is output, and the presence or absence of abnormality of the sensor 30 can be determined based on the change direction or change amount of the state quantity obtained thereby. If the change direction or change amount of the state quantity acquired after the output of the signal is different from the instruction content of the signal, it is determined that the sensor 30 is abnormal. Otherwise, the sensor 30 has no problem and the thermal fluid device 5 It can be judged as abnormal. By performing an internal check of the sensor 30 in this way, it is possible to suppress erroneous detection of abnormality of the thermofluid device 5 due to failure of the sensor 30 or the like. Therefore, the prediction accuracy of abnormality diagnosis of the thermal fluid device 5 can be improved.

FIG. 4 is a flowchart showing an abnormality diagnosis process (failure diagnosis method) in a failure diagnosis system according to another embodiment. As illustrated in a non-limiting manner in FIG. 4, in some embodiments, in step S <b> 20 for diagnosing whether or not there is a possibility of abnormality of the thermal fluid device 5, the state quantity detected by the sensor 30 and the thermal fluid device 5 The presence / absence of abnormality of the thermal fluid device 5 may be diagnosed by comparing with a threshold value that defines the range of the state quantity at the normal time (step S21).
If the detected state quantity is greater than or equal to the threshold (step S22: YES), the diagnosis unit 10 diagnoses that there is a possibility of abnormality of the thermal fluid device 5 (step S23), and the detected state quantity is less than the threshold. (Step S22: NO) may diagnose that there is no possibility of abnormality of the thermal fluid device 5 (Step S24), and the diagnosis process of the possibility of abnormality may be terminated.

  According to the above method, the presence or absence of abnormality of the thermal fluid device 5 is diagnosed by comparing the state amount detected by the sensor 30 with a threshold value that defines the range of the state amount of the thermal fluid device 5 when it is normal. . That is, when the state quantity detected by the sensor 30 exceeds the threshold value so as to be out of the range of the state quantity at the normal time, it can be determined that the thermal fluid device 5 may be abnormal. Thus, by comparing with the threshold value of the state quantity range at the normal time, the diagnostic accuracy of the possibility of abnormality of the thermal fluid device 5 based on the input from the sensor 30 can be improved.

In some embodiments, the failure diagnosis method outputs a signal for the minute change when the thermal fluid device 5 is diagnosed as having no possibility of abnormality (step S20: NO), and the thermal fluid device 5 is normal. A step of acquiring the change direction or the change amount of the state quantity at the time and updating the storage unit may be provided.
In the step of diagnosing the presence or absence of abnormality of the thermal fluid device 5 or the sensor 30 (step S50), if it is diagnosed that the thermal fluid device 5 may be abnormal (step S20: YES), the signal for the minute change described above. Is output (step S30) and the change direction or change amount of the state quantity acquired (step S40) is compared with the change direction or change amount of the state quantity stored in the storage unit (database 17). You may diagnose the presence or absence of abnormality of the apparatus 5 or the sensor 30 (step S50).

FIG. 5 is a flowchart showing an abnormality diagnosis process in a failure diagnosis system according to another embodiment.
As illustrated in a non-limiting manner in FIG. 5, in the above configuration, when the diagnosis unit 10 diagnoses that there is no possibility of abnormality in the thermal fluid device 5 (step S20: NO), the change in the normal state of the thermal fluid device 5 It is determined whether or not a certain cycle has elapsed since the previous comparison with the direction or the amount of change (step S81), and when it is determined that the certain cycle has elapsed (step S82: YES), You may be comprised so that a comparison (step S50) may be performed.
The cycle may be determined based on, for example, the time since the previous comparison (for example, once / week, once / month, etc.). Alternatively, the determination may be made based on the number of times that the diagnosis of the possibility of abnormality (step S20) is executed from the previous comparison (for example, 1/100 times).

  According to such a structure, the process (step S84) of grasping | ascertaining the sensor 30 in the normal time, and making it update in a memory | storage part (step S84) can be performed repeatedly regularly. Therefore, the latest information regarding the sensitivity of the sensor 30 in consideration of the change over time can be stored in the storage unit. Thereby, when it is diagnosed that there is a possibility of abnormality in the thermal fluid device 5, the latest sensor 30 sensitivity stored in the storage unit reflects the change direction or change amount obtained by minutely changing the state quantity. Therefore, the determination accuracy of the presence or absence of abnormality of the thermal fluid device 5 can be further improved.

  On the other hand, since there is a possibility that the change data is updated as a normal value even though an abnormality has occurred in the sensor, it may be updated only a certain number of times or for a certain period.

  FIG. 6 is a flowchart showing an abnormality diagnosis process in a failure diagnosis system according to another embodiment. As illustrated in a non-limiting example in FIG. 6, in some embodiments, the thermal fluid device 5 has an abnormality based on the change direction or the change amount of the state quantity obtained by outputting the signal for the minute change. When the diagnosis is made, a step (step S62) of outputting an instruction for eliminating the abnormality of the region specified from the type of state quantity indicating abnormality (step S61) may be provided.

The instruction for eliminating the abnormality can be realized by transmitting an arrangement signal from the diagnosis unit 10 to various arrangement destinations 60 corresponding to the content or part of the abnormality.
The following items can be cited as the contents of the abnormality obtained from the state quantity to be monitored and the correspondence for eliminating the abnormality.
That is, when the content of the detected abnormality is, for example, an excessive variation in exhaust gas temperature between cylinders (difference in exhaust gas temperature between cylinders), the diagnosis unit 10 sends a component (for example, an ignition plug) ) May be transmitted instructing the arrangement or replacement. Further, when the grasped abnormality is, for example, an increase in bearing temperature or an increase in the lubricant temperature at the bearing outlet, the diagnosis unit 10 instructs the arrangement destination 60 to arrange or replace a component (for example, bearing metal). A signal may be transmitted. In addition, when the content of the detected abnormality is, for example, a decrease in supply air pressure, a signal for requesting dispatch of a service person from the diagnosis unit 10 to the arrangement destination 60 (for example, for cleaning the wing of the turbocharger) You may send it. Furthermore, when the content of the detected abnormality is, for example, abnormal combustion (knocking), the diagnosis unit 10 requests the dispatcher 60 to dispatch service personnel (for example, to clean pistons and cylinders and remove combustion residues). A signal may be transmitted.

  According to the above configuration or method, when the diagnosis unit 10 diagnoses that the thermal fluid device 5 has an abnormality, the diagnosis unit 10 automatically outputs an instruction (signal) for eliminating the abnormality. For example, according to the content of the abnormality of the part diagnosed as having an abnormality, ordering parts for replacement and repair, arranging workers for maintenance work such as cleaning, etc. are diagnosed without the judgment of the worker It can be executed in a timely manner by the unit 10. Therefore, it is possible to smoothly cope with the abnormality while reducing the initial response load and time lag when the abnormality occurs, and thus it is possible to prevent the operating rate of the thermal fluid device 5 from being lowered.

Note that the failure diagnosis system 1 according to some embodiments described above may include a plurality of information processing apparatuses, and these information processing apparatuses may perform each process in a distributed manner.
In addition, by recording a program for executing each process of some of the above-described embodiments on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium The various processes described above may be performed.

  Here, the “computer system” may include hardware such as an OS (Operating System) and peripheral devices. Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW (World Wide Web) system is used. The “computer-readable recording medium” refers to a portable disk such as a flexible disk, a magneto-optical disk, a ROM (Read-only Memory), a writable nonvolatile memory such as a flash memory, a CD (Compact Disc) -ROM, or the like. A storage device such as a medium or a hard disk built in a computer system.

  Further, the “computer-readable recording medium” refers to a volatile memory (for example, DRAM (Dynamic) in a computer system serving as a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. Random Access Memory)) that holds a program for a certain period of time is also included. The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  According to at least one embodiment of the present disclosure described above, erroneous detection in abnormality diagnosis of the thermal fluid device 5 (device) can be suppressed.

  The present invention is not limited to the above-described embodiments, and includes forms obtained by changing the above-described embodiments and forms obtained by combining these forms.

1 Failure diagnosis system 2 Controller (ECU)
5 Thermal fluid equipment (controlled object)
10 Diagnosis Department (Remote monitoring center / abnormality diagnosis system installed in the field)
11 CPU
12 RAM
13 ROM (storage unit)
14 Bus 15 Abnormality diagnosis program 17 Database (storage unit)
18 Table 30 Sensor 40 Notification unit (alarm)
50 Communication Department 60 Arrangement place (neighboring service base / inventory management place)

Claims (15)

A sensor for detecting a state quantity relating to the operating state of the thermofluid device;
A diagnosis unit for diagnosing the possibility of abnormality of the thermal fluid device based on the detection result of the sensor,
When the diagnosis unit diagnoses that the thermal fluid device has the possibility of abnormality, the diagnosis unit outputs at least one of the change direction or the change amount of the state quantity obtained by outputting a signal for minutely changing the state quantity. A failure diagnosis system configured to diagnose whether there is an abnormality in the thermal fluid device or the sensor based on the failure diagnosis system. The fault diagnosis system according to claim 1, wherein the signal includes a command for changing the state quantity in a predetermined direction in accordance with the type of the state quantity. The failure diagnosis system according to claim 1, wherein the diagnosis unit is configured to output the signal via a controller for controlling an operation state of the thermal fluid device. The diagnostic unit compares the state quantity detected by the sensor with a threshold value that defines a range of the state quantity when the thermal fluid device is normal, and diagnoses the possibility of abnormality of the thermal fluid device. The fault diagnosis system according to any one of claims 1 to 3, wherein the fault diagnosis system is configured as described above. The diagnostic unit
Having individual initial data for each thermofluidic device with respect to the state quantity;
Comparing at least one of the change direction or the change amount of the state quantity acquired by outputting the signal with the initial data, it is configured to diagnose the presence or absence of abnormality of the thermal fluid device or the sensor. The fault diagnosis system according to any one of claims 1 to 4, wherein the fault diagnosis system is provided. A storage unit,
The diagnostic unit
When the thermal fluid device is diagnosed as having no possibility of abnormality, the signal is output to acquire the change direction or the change amount of the state quantity when the thermal fluid device is normal, and store it in the storage unit.
The change direction or change amount of the state quantity acquired by outputting the signal when diagnosing the thermal fluid device as having the possibility of abnormality, and the change direction of the state quantity stored in the storage unit or the The failure diagnosis system according to claim 1, wherein the failure diagnosis system is configured to diagnose whether there is an abnormality in the thermal fluid device or the sensor by comparing a change amount. The diagnostic unit
When it is diagnosed that the thermal fluid device is not likely to be abnormal, it is determined whether a certain cycle has elapsed since the previous comparison with the change direction or the change amount of the thermal fluid device at the normal time,
The fault diagnosis system according to claim 6, wherein the comparison with the change direction or the change amount in the normal time is executed when it is determined that the certain cycle has elapsed.
The fault diagnosis system according to any one of claims 1 to 7, wherein the thermal fluid device includes any one of an engine, a boiler, and a gas turbine. When the diagnosis unit diagnoses that there is an abnormality in the thermal fluid device based on the change direction or the change amount of the state quantity obtained by outputting the signal, the diagnosis unit is specified from the type of the state quantity indicating an abnormality. The fault diagnosis system according to any one of claims 1 to 8, wherein the fault diagnosis system is configured to output an instruction for eliminating the abnormality of a part to be detected. The information processing device according to any one of claims 1 to 9, further comprising a notification unit that notifies the fact that the diagnosis unit is diagnosed as having an abnormality in the thermal fluid device or the sensor. Fault diagnosis system. Detecting a state quantity related to the operating state of the thermofluid device with a sensor;
Diagnosing the possibility of abnormality of the thermal fluid device based on the detection result of the sensor;
Outputting a signal for minutely changing the state quantity when it is diagnosed that there is a possibility of abnormality in the thermal fluid device in the diagnosing step;
Obtaining a change direction or a change amount of the state quantity according to the output of the signal;
Diagnosing the presence or absence of abnormality of the thermal fluid device or the sensor based on at least one of the acquired change direction or the change amount;
A failure diagnosis method comprising: In the step of diagnosing the presence or absence of the possibility of abnormality,
The state quantity detected by the sensor is compared with a threshold value that defines a range of the state quantity when the thermal fluid device is normal, thereby diagnosing the presence or absence of the abnormality possibility of the thermal fluid device. The failure diagnosis method according to claim 11. In the step of diagnosing the presence or absence of abnormality of the thermal fluid device or the sensor,
By comparing at least one of the change direction or the change amount of the state quantity obtained by outputting the signal with individual initial data for each of the thermofluid equipment with respect to the state quantity, The failure diagnosis method according to claim 11, wherein the presence or absence of abnormality of the sensor is diagnosed. A step of outputting the signal when the thermofluid device is diagnosed as having no possibility of abnormality, obtaining a change direction or a change amount of the state quantity when the thermofluid device is normal, and storing it in a storage unit; Prepared,
In the step of diagnosing the presence or absence of abnormality of the thermal fluid device or the sensor,
The change direction or the change amount of the state quantity acquired by outputting the signal when the thermofluid device is diagnosed as having the possibility of abnormality, and the change of the state quantity stored in the storage unit The failure diagnosis method according to any one of claims 11 to 13, wherein the presence or absence of abnormality of the thermal fluid device or the sensor is diagnosed by comparing a direction or the amount of change. When it is diagnosed that there is an abnormality in the thermal fluid device based on the change direction or the change amount of the state quantity acquired by outputting the signal, the region specified by the type of the state quantity indicating the abnormality The failure diagnosis method according to claim 11, further comprising a step of outputting an instruction for eliminating the abnormality.

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