Fault determination system, fault determination method, control device, and program

Abstract

A failure determination system (100) according to the present disclosure is provided with: ventilation equipment (2); a gas concentration sensor (1) for outputting a detection value corresponding to the concentration of a gas, sounding an alarm on the basis of the detection value, and transmitting alarm sounding information; and a control device (3). The control device (3) comprises a communication unit (31) for receiving the alarm sounding information, a ventilation control unit (32) for performing control such that the ventilation equipment (2) executes a ventilation operation on the basis of the alarm sounding information, and a determination unit (33) for determining, on the basis of the alarm sounding information, whether or not the gas concentration sensor (1) has failed after a ventilation completion time (t) has elapsed since the start of the control.

Description

[Technical field]

[0001] The present disclosure relates to a failure determination system, a failure determination method, a control device, and a program for determining a failure of a gas concentration sensor. [Background technology]

[0002] Conventionally, gas sensors that detect the concentration of gases such as oxygen and combustible gases are known (Non-Patent Document 1). Also known is a gas concentration detector that includes such a gas sensor and issues an alarm when the concentration of the gas detected by the gas sensor is not within a predetermined range. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Tsuyoshi Ueda, "Principles, Structures, and Features of Various Gas Sensors (Special Feature: Advances in Gas Sensors and New Applications)," Chemical Engineering of Japan, 81(8), 410-413, 2017 Summary of the Invention [Problem to be solved by the invention]

[0004] However, a gas concentration sensor may malfunction due to deterioration or the like, and may issue an alarm even if the gas concentration is within a predetermined range.

[0005] For example, in a gas concentration detector that includes a gas sensor that detects the concentration of oxygen and issues an alarm when the concentration of oxygen is below a predetermined value, the gas sensor may deteriorate, causing the sensor to lose sensitivity and output a detection value that is lower than the normal detection value. In this case, the gas concentration detector may also issue an alarm when the concentration of oxygen is equal to or higher than the predetermined value. In a gas concentration detector that includes a gas sensor that detects the concentration of a combustible gas and issues an alarm when the concentration of the combustible gas is equal to or higher than the predetermined value, a malfunction of the gas inlet to the gas sensor may cause the sensor to detect a larger amount of gas than when the inlet is normal, causing the sensor to output a detection value that is higher than the normal detection value. In this case, the gas concentration detector may also issue an alarm when the concentration of the combustible gas is below the predetermined value.

[0006] Therefore, it was difficult to remotely determine whether the alarm was issued because the gas concentration sensor was normal and the gas concentration was not within a specified range, or whether the alarm was issued because the gas concentration sensor was faulty.

[0007] In consideration of the above circumstances, an object of the present disclosure is to provide a failure determination system, a failure determination method, a control device, and a program that can remotely determine whether a gas concentration sensor is malfunctioning. [Means for solving the problem]

[0008] In order to solve the above problems, the failure determination system of the present disclosure comprises a ventilation equipment, a gas concentration sensor that outputs a detection value corresponding to the gas concentration in the space in which the ventilation equipment is installed, issues an alarm based on the detection value, and transmits alarm activation information regarding the issuance of the alarm, and a control device, wherein the control device includes a communication unit that receives the alarm activation information, a ventilation control unit that controls the ventilation equipment to perform a ventilation operation based on the alarm activation information, and a determination unit that determines whether or not the gas concentration sensor has failed based on the alarm activation information after a ventilation completion time has elapsed from the start of the control.

[0009] In addition, in order to solve the above problem, the failure determination method of the present disclosure includes the steps of outputting a detection value corresponding to the gas concentration in a space in which a ventilation equipment is installed, issuing an alarm based on the detection value, controlling the ventilation equipment to perform a ventilation operation based on the alarm issuance information, and determining whether or not the gas concentration sensor has failed based on the alarm issuance information after a ventilation completion time has elapsed from the start of the control.

[0010] In addition, in order to solve the above problems, the control device of the present disclosure includes a communication unit that receives alarm activation information regarding the issuance of an alarm transmitted from a gas concentration sensor that outputs a detection value corresponding to the concentration of gas in a space in which a ventilation equipment is installed and issues an alarm based on the detection value, a ventilation control unit that controls the ventilation equipment to start ventilation operation based on the alarm activation information, and a judgment unit that judges whether or not the gas concentration sensor has malfunctioned based on the alarm activation information after a ventilation completion time has elapsed from the control.

[0011] In order to solve the above problem, a program according to the present disclosure causes a computer to function as the above-mentioned control device. Effect of the Invention

[0012] According to the failure determination system, failure determination method, control device, and program disclosed herein, it is possible to remotely determine whether or not a gas concentration sensor has a failure. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic diagram of a fault determination system according to a first embodiment of the present disclosure. [Diagram 2] 2 is a diagram for explaining a change in a detection value due to a failure of the gas concentration sensor shown in FIG. 1. [Diagram 3] 2 is a sequence diagram showing an example of an operation of the failure determination system shown in FIG. [Figure 4]4 is a flowchart for explaining in detail an example of the execution of the sensing operation shown in FIG. 3. [Diagram 5] 4 is a flowchart showing in detail an example of a fault determination shown in FIG. 3. [Figure 6] FIG. 4 is a schematic diagram of a fault determination system according to a second embodiment of the present disclosure. [Figure 7] FIG. 2 is a hardware block diagram of a control device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] <<First embodiment>> The overall configuration of the first embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic diagram of a failure determination system 100 according to this embodiment.

[0015] 1, a fault determination system 100 according to the first embodiment includes a gas concentration sensor 1, a ventilation equipment 2, and a control device 3. The control device 3 communicates with the gas concentration sensor 1 and the ventilation equipment 2 via a communication network.

[0016] <Gas concentration sensor configuration> The gas concentration sensor 1 includes a gas sensor 11. The gas concentration sensor 1 is disposed in a space SP in which a ventilation system 2 is provided. The space SP can be any space defined by a structure, for example, an underground tunnel. The gas concentration sensor 1 outputs a detection value according to the gas concentration in the space SP in which the ventilation system is provided, and issues an alarm based on the detection value. Specifically, the gas concentration sensor 1 does not issue an alarm when the detection value is within a predetermined range, and issues an alarm when the detection value is outside the predetermined range.

[0017] In one example, the gas whose concentration is detected by the gas concentration sensor 1 may be oxygen. In such a configuration, the above-mentioned predetermined range is equal to or greater than a first predetermined value. For this reason, the gas concentration sensor 1 does not issue an alarm when the detected value is equal to or greater than the first predetermined value, but issues an alarm when the detected value is less than the first predetermined value. This allows people in the space SP in which the gas concentration sensor 1 is disposed to recognize that the oxygen concentration in the space SP is lower than the normal oxygen concentration, and makes it possible for them to take measures such as leaving the space SP or using a device for inhaling oxygen.

[0018] In another example, the gas whose concentration is detected by the gas concentration sensor 1 may be a combustible gas. In such a configuration, the above-mentioned predetermined range is less than a second predetermined value. Therefore, the gas concentration sensor 1 issues an alarm when the detection value is equal to or greater than the second predetermined value, and does not issue an alarm when the detection value is less than the second predetermined value. This allows people in the space SP in which the gas concentration sensor 1 is disposed to recognize that the concentration of combustible gas in the space SP is higher than the usual concentration of combustible gas, and allows them to take measures such as leaving the space SP or refraining from using firearms.

[0019] The alarm may be, for example, a sound. In a configuration in which the alarm is a sound, the sound may be an alarm sound, or a voice indicating that the detection value is outside a predetermined range. The alarm may be, for example, an image displayed on a display device such as a liquid crystal or organic electroluminescence (EL) display. In a configuration in which the alarm is an image, the image may indicate that the detection value is outside a predetermined range, or may display information to encourage the user to leave the space SP in which the gas concentration sensor 1 is disposed.

[0020] Furthermore, the gas concentration sensor 1 transmits to the control device 3 alarm activation information regarding the activation of an alarm by the gas concentration sensor 1 .

[0021] In one example, the alarm activation information may be alarm in progress information indicating that an alarm is being activated. In such a configuration, the gas concentration sensor 1 transmits the alarm in progress information each time it detects that the gas concentration is not within a predetermined range. In another example, the alarm activation information may be alarm start information and alarm stop information. In such a configuration, the gas concentration sensor 1 transmits alarm start information when it starts activating an alarm, and transmits alarm stop information when it stops activating an alarm.

[0022] Here, the relationship between the gas concentration and the detection value by the gas concentration sensor 1 will be described with reference to FIG. 2. The example shown in FIG. 2 is the relationship between the gas concentration and the detection value by the gas concentration sensor 1 when the gas is oxygen. As shown in FIG. 2, the detection value increases as the gas concentration increases. Also, as shown by the dashed line in FIG. 2, the detection value for the oxygen concentration by the gas concentration sensor 1 in a faulty state is lower than the detection value for the oxygen concentration by the gas concentration sensor 1 in a normal state, as shown by the solid line. Therefore, for example, when the oxygen concentration is C 10 In the case where it is necessary to alert people in the space SP when the detection value detected by the gas concentration sensor 1 is less than a first predetermined value V1, the gas concentration sensor 1 is configured to issue an alarm when the detection value detected by the gas concentration sensor 1 is less than a first predetermined value V1.

[0023] In such a configuration, when the gas concentration sensor 1 is in a fault state, the oxygen concentration is C 10 Higher C 11 When the oxygen concentration is less than the predetermined value C, the detection value detected by the gas concentration sensor 1 is less than the first predetermined value V1. 11 An alarm is issued when the oxygen concentration is less than the predetermined value C. 10 Even in these safe cases, unnecessary attention may be drawn.

[0024] Similarly, when the gas is a flammable gas, the detection value of the flammable gas concentration by the gas concentration sensor 1 in a faulty state is higher than the detection value of the flammable gas concentration by the gas concentration sensor 1 in a normal state. 20 When it is necessary to alert people in the space SP when the detection value detected by the gas concentration sensor 1 is equal to or greater than a second predetermined value V2, the gas concentration sensor 1 is configured to issue an alarm.

[0025] In such a configuration, when the gas concentration detector 1 is in a fault state, the concentration of the combustible gas is C 20 Lower C 21 In the above case, the detection value detected by the gas concentration detector 1 becomes equal to or greater than the second predetermined value V2. 21 When the concentration of flammable gas exceeds the specified value C, an alarm is issued. 20 Even when less than this level is safe, unnecessary attention may be drawn.

[0026] The ventilation equipment 2 and the control device 3 used to determine whether or not the gas concentration sensor 1 has malfunctioned will be described in detail below.

[0027] <Ventilation equipment configuration> The ventilation equipment 2 is disposed in the space SP. For example, the ventilation equipment 2 may be attached to a member such as a wall or a ceiling that separates the space SP from the outside. The ventilation equipment 2 includes an inflow side ventilation equipment 21 and an outflow side ventilation equipment 22.

[0028] The inlet side ventilation equipment 21 is a ventilation equipment for introducing gas from the outside, and is, for example, a ventilation fan.

[0029] The outflow side ventilation equipment 22 is a ventilation equipment for discharging the gas in the space SP to the outside, and may be a ventilation fan or a ventilation port.

[0030] <Control device configuration> The control device 3 includes a communication unit 31, a ventilation control unit 32, a determination unit 33, and an output unit 34. The communication unit 31 is configured by a communication interface for communicating with other devices such as external devices. For example, standards such as Ethernet (registered trademark), FDDI (Fiber Distributed Data Interface), and Wi-Fi (registered trademark) may be used for the communication interface. The ventilation control unit 32 and the determination unit 33 configure a control unit (controller). The control unit may be configured by dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array), may be configured by a processor, or may be configured including both. The output unit 34 may be configured by a communication interface, may be configured by an audio output interface, or may be configured by a display interface. The audio output interface may be a speaker or the like. The display interface is an interface for displaying information on a display device configured by a liquid crystal panel, an organic EL, or the like.

[0031] The communication unit 31 receives alarm activation information. As described above, in a configuration in which the alarm activation information is alarm activation information, the communication unit 31 receives the alarm activation information transmitted when the gas concentration sensor 1 is activating an alarm. In addition, in a configuration in which the alarm activation information is alarm start information and alarm stop information, the communication unit 31 receives the alarm start information transmitted when the gas concentration sensor 1 starts activating an alarm, and receives the alarm stop information transmitted when the gas concentration sensor 1 stops activating an alarm.

[0032] Based on the alarm information received by the communication unit 31, the ventilation control unit 32 controls the ventilation equipment 2 to perform a ventilation operation.

[0033] Specifically, the ventilation control unit 32 controls the ventilation equipment 2 to perform a ventilation operation when the alarm activation information indicates that an alarm has been activated by the gas concentration sensor 1. For example, the ventilation control unit 32 controls the ventilation equipment 2 to perform a ventilation operation when the alarm activation information is alarm activation in progress information. Also, for example, the ventilation control unit 32 controls the ventilation equipment 2 to perform a ventilation operation when the alarm activation information received by the communication unit 31 is alarm activation start information and alarm stop information has not been received after the alarm activation start information is received.

[0034] Furthermore, when the alarm activation information indicates that no alarm has been activated by the gas concentration sensor 1, the ventilation control unit 32 controls the ventilation equipment 2 not to perform the ventilation operation. For example, when no alarm activation information has been received, the ventilation control unit 32 controls the ventilation equipment 2 not to perform the ventilation operation. For example, when the alarm activation information received by the communication unit 31 is alarm activation stop information and no alarm start information has been received after the alarm activation information has been received, the ventilation control unit 32 controls the ventilation equipment 2 not to perform the ventilation operation.

[0035] More specifically, the ventilation control unit 32 rotates the ventilation fan which is the inflow side ventilation equipment 21 in controlling the ventilation equipment 2 to perform the ventilation operation. In a configuration in which the outflow side ventilation equipment 22 is a ventilation fan, the ventilation control unit 32 may rotate the outflow side ventilation equipment 22 in controlling the ventilation equipment 2 to perform the ventilation operation. In a configuration in which the outflow side ventilation equipment 22 is a ventilation port, the ventilation control unit 32 may open the outflow side ventilation equipment 22 in controlling the ventilation equipment 2 to perform the ventilation operation. Note that the arrow from the ventilation control unit 32 to the outflow side ventilation equipment 22 is omitted in FIG. 1.

[0036] The determination unit 33 determines whether the gas concentration detector 1 is broken or not based on the alarm issuance information after the ventilation completion time t1 has elapsed from the start of control to make the ventilation equipment 2 execute the ventilation operation. The ventilation completion time t1 is the time required for the gas whose concentration is detected by the gas concentration detector 1 to be exchanged with an external gas. As shown in the following formula (1), the ventilation completion time t1 is a value obtained by dividing the volume in the space SP from the inflow side ventilation equipment 21 to the gas sensor 11 of the gas concentration detector 1 by the air volume Q (m / s) of the gas that flows in from the external environment per unit time. The volume from the inflow side ventilation equipment 21 to the gas sensor 11 of the gas concentration detector 1 is a value obtained by integrating the cross-sectional area A(l) of the space SP perpendicular to the line segment from the inflow side ventilation equipment 21 to the gas sensor 11 of the gas concentration detector 1 by the distance l from the inflow side ventilation equipment 21, as shown in FIG. 1. Note that L in formula (1) is the distance from the inflow side ventilation equipment 21 to the gas sensor 11 of the gas concentration detector 1.

[0037]

number

[0038] When the cross-sectional area A(l) of the space SP is a constant value A that does not depend on the distance l, the ventilation completion time t1 is expressed by the following equation (2).

[0039]

number

[0040] Then, when it is determined that the alarm is still being issued after the ventilation completion time t1 has elapsed, the determination unit 33 determines that the gas concentration sensor 1 is malfunctioning. Also, when it is determined that the alarm is not still being issued after the ventilation completion time t1 has elapsed, the determination unit 33 determines that the gas concentration sensor 1 is not malfunctioning.

[0041] In one example, the determination unit 33 determines whether the communication unit 31 continues to receive the alarm activation information after the ventilation completion time t1 has elapsed since the ventilation equipment 2 started to control the ventilation operation. If the communication unit 31 continues to receive the alarm activation information, the determination unit 33 determines that the gas concentration sensor 1 is malfunctioning. If the communication unit 31 does not receive the alarm activation information, the determination unit 33 determines that the gas concentration sensor 1 is not malfunctioning.

[0042] In another example, the determination unit 33 determines whether the communication unit 31 has received alarm stop information from the start of control to cause the ventilation equipment 2 to perform a ventilation operation until the ventilation completion time t1 has elapsed. If the communication unit 31 has not received alarm stop information from the start of control to cause the ventilation equipment 2 to perform a ventilation operation until the ventilation completion time t1 has elapsed, the determination unit 33 determines that the gas concentration sensor 1 has malfunctioned. If the communication unit 31 has received alarm stop information from the start of control to cause the ventilation equipment 2 to perform a ventilation operation until the ventilation completion time t1 has elapsed, the determination unit 33 determines that the gas concentration sensor 1 has not malfunctioned.

[0043] The output unit 34 outputs the result determined by the determination unit 33. Specifically, the output unit 34 can display the result determined by the determination unit 33. The output unit 34 may output a sound indicating the result determined by the determination unit 33. The output unit 34 may transmit the result determined by the determination unit 33 to another device via a communication network.

[0044] <Operation of the fault determination system> Here, the operation of the fault determination system 100 according to the first embodiment will be described with reference to Fig. 3. Fig. 3 is a sequence diagram showing an example of the operation in the fault determination system 100 according to the first embodiment. The operation in the fault determination system 100 described with reference to Fig. 3 corresponds to the fault determination method of the fault determination system 100 according to the first embodiment.

[0045] In step S1, the gas concentration sensor 1 performs a sensing operation.

[0046] Now, with reference to FIG. 4, the sensing operation performed by the gas concentration sensor 1 will be described in detail.

[0047] In step S11, the gas concentration sensor 1 outputs a detection value corresponding to the gas concentration in the space SP in which the ventilation equipment 2 is installed.

[0048] In steps S12 and S13, the gas concentration sensor 1 issues an alarm based on the detected value.

[0049] Specifically, first, in step S12, the gas concentration sensor 1 determines whether or not the detected value is within a predetermined range.

[0050] If it is determined in step S12 that the detected value is within the predetermined range, the gas concentration sensor 1 returns to step S11 and repeats the operation. If it is determined in step S12 that the detected value is outside the predetermined range, the gas concentration sensor 1 issues an alarm in step S13.

[0051] Returning to FIG. 3, the gas concentration sensor 1 transmits alarm activation information to the control device 3 in step S2.

[0052] Thereafter, the gas concentration sensor 1 executes a sensing operation at a predetermined timing (step S1-k (k is an integer from 1 to N)), and when an alarm is issued during the sensing operation, transmits alarm issuance information (step S2-k), and repeats this process.

[0053] In step S3, the communication unit 31 of the control device 3 receives the alarm issuance information.

[0054] In step S4, the ventilation control section 32 of the control device 3 controls the ventilation equipment 2 to perform a ventilation operation based on the alarm issuance information.

[0055] In step S5, the ventilation equipment 2 performs the ventilation operation.

[0056] In step S6, the determination unit 33 of the control device 3 determines whether or not the gas concentration sensor 1 has failed based on the alarm activation information after the ventilation completion time t1 has elapsed from the start of control.

[0057] Here, the fault determination performed by the determination unit 33 of the control device 3 will be described in detail with reference to the flowchart of FIG.

[0058] In step S61, the determination unit 33 determines whether or not a ventilation completion time t1 has elapsed since control for causing the ventilation equipment 2 to perform a ventilation operation.

[0059] If it is determined in step S61 that the ventilation completion time t1 has not elapsed since the control for causing the ventilation equipment 2 to perform the ventilation operation was started, the determination unit 33 executes the process of step S61 again. Also, if it is determined in step S61 that the ventilation completion time t1 has elapsed since the control for causing the ventilation equipment 2 to perform the ventilation operation was started, the determination unit 33 determines in step S62 whether the alarm is still being issued.

[0060] If it is determined in step S62 that the alarm is not continuing, then in step S63 the determination unit 33 determines that the gas concentration sensor 1 is not malfunctioning.

[0061] If it is determined in step S62 that the alarm is still being issued, then in step S64 the determination unit 33 determines that the gas concentration sensor 1 is malfunctioning.

[0062] Returning to FIG. 3, in step S7, the output unit 34 outputs a determination result indicating whether or not the gas concentration sensor 1 has a malfunction.

[0063] As described above, according to the first embodiment, the failure determination system 100 receives alarm activation information and controls the ventilation equipment 2 based on the alarm activation information. Then, the failure determination system 100 determines whether or not the gas concentration sensor 1 has malfunctioned based on the alarm activation information after the ventilation completion time t1 has elapsed from the start of control to cause the ventilation equipment 2 to perform a ventilation operation. Therefore, the failure determination system 100 can remotely determine whether or not the gas concentration sensor 1 has malfunctioned.

[0064] <<Second embodiment>> The overall configuration of the second embodiment will be described with reference to Fig. 6. Fig. 6 is a schematic diagram of a fault determination system 101 according to the second embodiment. In the second embodiment, the same functional units as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0065] 6, a failure determination system 101 according to the second embodiment includes a gas concentration sensor 1, a ventilation facility 2-1, and a control device 3-1. The control device 3-1 communicates with the gas concentration sensor 1 and the ventilation facility 2-1 via a communication network.

[0066] <Ventilation equipment configuration> The ventilation equipment 2-1 is disposed in the space SP, similarly to the ventilation equipment 2 of the first embodiment. The ventilation equipment 2-1 includes an inflow side ventilation equipment 21, an outflow side ventilation equipment 22, and a pipe .

[0067] The pipe 23 is disposed within the space SP and passes gas flowing in from outside the space SP toward the gas concentration sensor 1. In one example, as shown in Fig. 6, the pipe 23 extends from the inflow-side ventilation equipment 21 to the gas concentration sensor 1. In such an example, the cross-sectional area As(l) of the pipe 23 is smaller than the cross-sectional area A(l) of the space SP at any distance l in the direction from the inflow-side ventilation equipment 21 toward the gas concentration sensor 1. In the example shown in Fig. 6, the cross-sectional area As(l) of the pipe 23 is a constant value As independent of the distance l.

[0068] <Control device configuration> The control device 3-1 includes a communication unit 31, a ventilation control unit 32, a determination unit 33-1, and an output unit 34. The determination unit 33-1 constitutes a control unit (controller) similarly to the determination unit 33 of the first embodiment.

[0069] The judgment unit 33-1 judges whether the gas concentration detector 1 is faulty or not based on the alarm issuance information after the ventilation completion time t2 has elapsed since the ventilation equipment 2 started to control the operation. The ventilation completion time t2 is the time required for the gas whose concentration is detected by the gas concentration detector 1 to be exchanged with an external gas. The ventilation completion time t2 is expressed by the following formula (3). In formula (3), L is the distance from the inflow side ventilation equipment 21 to the gas sensor 11 of the gas concentration detector 1, and As is the cross-sectional area of ​​the pipe 23. Qs is the air volume (m / s) of gas flowing from the external environment into the pipe 23 per unit time.

[0070]

number

[0071] Note that formula (3) shows the ventilation completion time t2 in an example where the cross-sectional area of ​​the pipe 23 is constant. When the cross-sectional area As of the pipe 23 is not constant but is As(l) that depends on the distance l, the ventilation completion time t2 can be determined by dividing the value obtained by integrating the cross-sectional area As(l) of the pipe 23 with the distance l from the inflow-side ventilation equipment 21 by the air volume Qs (m / s).

[0072] 6, the shape and arrangement of the pipe 23 may be such that one end of the pipe 23 is located in the ventilation equipment 2 and the other end is located at any point between the ventilation equipment 2 and the gas concentration sensor 1. For example, the pipe 23 may be arranged such that one end of the pipe 23 is located near the ventilation equipment 2 and the other end is located at an intermediate point between the ventilation equipment 2 and the gas concentration sensor 1.

[0073] Then, when the judgment unit 33-1 judges that the alarm is still being issued after the ventilation completion time t2 has elapsed, it judges that the gas concentration sensor 1 is malfunctioning. Moreover, when the judgment unit 33-1 judges that the alarm is not still being issued after the ventilation completion time t2 has elapsed, it judges that the gas concentration sensor 1 is not malfunctioning. Details of the judgment method by the judgment unit 33-1 are similar to the details of the judgment method by the judgment unit 33, except for the ventilation completion time t2.

[0074] <Operation of the fault determination system> The operation of the failure determination system 101 according to the second embodiment is the same as the operation of the failure determination system 100 according to the first embodiment, except that the ventilation completion time t2 is used instead of the ventilation completion time t1.

[0075] As described above, according to the second embodiment, the failure determination system 101 includes a pipe 23 disposed in the space SP, which passes gas flowing in from outside the space SP toward the gas concentration sensor 1. Therefore, the gas flowing in from outside the space SP can efficiently reach the gas concentration sensor 1, and the gas detected by the gas concentration sensor 1 is efficiently replaced with the gas flowing in from outside the space SP. Therefore, the failure determination system 101 can determine whether or not the gas concentration sensor 1 has a failure in a shorter time than the failure determination system 100 of the first embodiment.

[0076] <Program> The above-mentioned control devices 3 and 3-1 can be realized by a computer 102. Also, a program for functioning as each of the control devices 3 and 3-1 may be provided. Also, the program may be stored in a storage medium or provided through a network. FIG. 7 is a block diagram showing a schematic configuration of a computer 102 functioning as each of the control devices 3 and 3-1. Here, the computer 102 may be a general-purpose computer, a dedicated computer, a workstation, a PC (Personal Computer), an electronic notepad, or the like. The program instructions may be program code, code segments, or the like for performing necessary tasks.

[0077] 7, the computer 102 includes a processor 110, a read only memory (ROM) 120, a random access memory (RAM) 130, a storage 140, an input unit 150, an output unit 160, and a communication interface (I / F) 170. Each component is communicably connected to each other via a bus 180. The processor 110 is specifically a central processing unit (CPU), a micro processing unit (MPU), a graphics processing unit (GPU), a digital signal processor (DSP), a system on a chip (SoC), or the like, and may be composed of multiple processors of the same type or different types.

[0078] The processor 110 controls each of the components and executes various arithmetic processing. That is, the processor 110 reads a program from the ROM 120 or the storage 140, and executes the program using the RAM 130 as a working area. The processor 110 controls each of the components and executes various arithmetic processing according to the program stored in the ROM 120 or the storage 140. In this embodiment, the program according to the present disclosure is stored in the ROM 120 or the storage 140.

[0079] The program may be stored in a storage medium readable by the computer 102. By using such a storage medium, the program can be installed in the computer 102. Here, the storage medium in which the program is stored may be a non-transitory storage medium. The non-transitory storage medium is not particularly limited, and may be, for example, a CD-ROM, a DVD-ROM, or a USB (Universal Serial Bus) memory. In addition, the program may be in a form that is downloaded from an external device via a network.

[0080] The ROM 120 stores various programs and various data. The RAM 130 temporarily stores programs or data as a working area. The storage 140 is configured with a hard disk drive (HDD) or a solid state drive (SSD), and stores various programs including an operating system and various data.

[0081] The input unit 150 includes one or more input interfaces that receive an input operation from a user and acquire information based on the user's operation. For example, the input unit 150 is a pointing device, a keyboard, a mouse, etc., but is not limited to these.

[0082] The output unit 160 includes one or more output interfaces that output information. For example, the output unit 160 is a display that outputs information as a video or a speaker that outputs information as a sound, but is not limited to these. Note that, if the output unit 160 is a touch panel type display, it also functions as the input unit 150.

[0083] The communication interface 170 is an interface for communicating with an external device.

[0084] The following supplementary notes are further disclosed regarding the above embodiment.

[0085] (Additional note 1) Ventilation equipment, a gas concentration sensor that outputs a detection value corresponding to a gas concentration in a space in which the ventilation equipment is installed, issues an alarm based on the detection value, and transmits alarm information regarding the issuance of the alarm; and a control device, the control device comprising: receiving the alarm information; Controlling the ventilation equipment to perform a ventilation operation based on the alarm information; A failure determination system that determines whether or not the gas concentration sensor is malfunctioning based on the alarm activation information after a ventilation completion time has elapsed from the start of the control. (Additional note 2) The failure determination system described in Appendix 1, wherein the control device determines that the gas concentration sensor is faulty if it determines that the alarm is continuing after the ventilation completion time has elapsed, and determines that the gas concentration sensor is not faulty if it determines that the alarm is not continuing after the ventilation completion time has elapsed. (Additional note 3) 4. The fault determination system according to any one of claims 1 to 3, further comprising a pipe disposed within the space through which the gas flowing in from outside the space passes toward the gas concentration sensor. (Additional note 4) outputting a detection value corresponding to a concentration of gas in a space in which the ventilation equipment is installed; issuing an alarm based on the detected value; A step of controlling the ventilation equipment to perform a ventilation operation based on alarm activation information regarding the activation of the alarm; a step of determining whether or not the gas concentration sensor is malfunctioning based on the alarm activation information after a ventilation completion time has elapsed from the start of the control. (Additional note 5) a communication unit that receives alarm activation information regarding the issuance of an alarm transmitted from a gas concentration sensor that outputs a detection value corresponding to a gas concentration in a space in which the ventilation equipment is installed and issues an alarm based on the detection value; A control unit. The control unit is Controlling the ventilation equipment to start a ventilation operation based on the alarm information; a control device that determines whether or not the gas concentration sensor has malfunctioned based on the alarm activation information after the ventilation completion time has elapsed since the control. (Additional note 6) A non-transitory storage medium storing a program executable by a computer, the non-transitory storage medium storing the program causing the computer to function as the control device described in appended claim 5.

[0086] All publications, patent applications, and standards mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent application, and standard was specifically and individually indicated to be incorporated by reference.

[0087] Although the above-mentioned embodiment has been described as a representative example, it is obvious to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of the present disclosure. Therefore, the present invention should not be interpreted as being limited by the above-mentioned embodiment, and various modifications or changes can be made without departing from the scope of the claims. For example, it is possible to combine multiple building blocks shown in the configuration diagram of the embodiment into one, or to divide one building block. [Explanation of symbols]

[0088] 1 Gas concentration detector 11 Gas Sensor 2.2-1 Ventilation equipment 3, 3-1 Control device 21 Inlet ventilation equipment 22 Outlet ventilation equipment 23 Pipe 31 Communications Department 32 Ventilation control section 33, 33-1 Judgment section 34 Output section 100, 101 Congestion Information Processing System 102 Computer 110 Processor 120 ROM 130 RAM 140 Storage 150 Input section 160 Output section 170 Communication Interface 180 Bus

Claims

1. Ventilation equipment and a gas concentration sensor that outputs a detection value corresponding to a gas concentration in a space in which the ventilation equipment is installed, issues an alarm based on the detection value, and transmits alarm information regarding the issuance of the alarm; and a control device, the control device comprising: A communication unit that receives the alarm information; A ventilation control unit that controls the ventilation equipment to perform a ventilation operation based on the alarm information; a determination unit that determines whether or not the gas concentration sensor is broken based on the alarm activation information after a ventilation completion time has elapsed from the start of the control, The failure determination system wherein the judgment unit determines that the gas concentration sensor is faulty if it determines that the alarm continues to be issued after the ventilation completion time has elapsed, and determines that the gas concentration sensor is not faulty if it determines that the alarm does not continue to be issued after the ventilation completion time has elapsed.

2. 2. The fault determination system according to claim 1, further comprising a pipe disposed within the space for passing the gas flowing in from outside the space toward the gas concentration sensor.

3. outputting a detection value corresponding to a concentration of gas in a space in which the ventilation equipment is installed; issuing an alarm based on the detected value; A step of controlling the ventilation equipment to perform a ventilation operation based on alarm activation information regarding the activation of the alarm; and after a ventilation completion time has elapsed from the start of the control, determining whether or not the gas concentration sensor has failed based on the alarm activation information, The determination step determines that the gas concentration sensor is faulty if it is determined that the alarm continues to be issued after the ventilation completion time has elapsed, and determines that the gas concentration sensor is not faulty if it is determined that the alarm does not continue to be issued after the ventilation completion time has elapsed.

4. a communication unit that receives alarm activation information regarding the issuance of an alarm transmitted from a gas concentration sensor that outputs a detection value corresponding to a gas concentration in a space in which the ventilation equipment is installed and issues an alarm based on the detection value; A ventilation control unit that controls the ventilation equipment to start a ventilation operation based on the alarm information; a determination unit that determines whether or not the gas concentration sensor is broken based on the alarm activation information after a ventilation completion time has elapsed since the control, The control device, wherein the judgment unit judges that the gas concentration sensor is faulty if it determines that the alarm continues to be issued after the ventilation completion time has elapsed, and judges that the gas concentration sensor is not faulty if it determines that the alarm is not continuing to be issued after the ventilation completion time has elapsed.

5. A program for causing a computer to function as the control device according to claim 4.

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