Smell event detection system

Abstract

To adequately evaluate a risk of a smell event occurring in a cabin.SOLUTION: A smell event detection system 1 includes a smell sensor 26 which is arranged in a cabin and detects intensity of a smell component in air in the cabin, and an arithmetic processing unit 27 which is arranged in a vehicle 2 provided with the cabin and detects a smell event on the basis of a detection result of the smell sensor 26. The arithmetic processing unit 27 includes an intensity determination part 271 which determines whether or not the intensity of the smell component detected by the smell sensor 26 is equal to or more than a threshold, an operation determination part 272 which determines whether or not purification operation for purifying the air in the cabin is executed on the basis of respective operation signals of a window device 21, a door device 22, and an air conditioning device 23 of the vehicle 2, and an evaluation part 273 which evaluates a risk of the smell event by detecting occurrence of the smell event on the basis of a determination result of the intensity determination part 271 and a determination result of the operation determination part 272.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an odor event detection system that detects an event related to an odor occurring within a vehicle compartment. [Background technology]

[0002] In services such as car sharing or rental car businesses that rent vehicles to users, the user may vomit or smoke in the vehicle interior, soiling the interior of the vehicle. When the vehicle interior is soiled, a foul odor is generated, and even if the vomit or the like is removed, the foul odor may remain in the vehicle interior for a while. Since such vehicles often require special cleaning work after being returned, it is reasonable for the service provider to charge a premium to the user who caused the soiling. However, when the service provider is busy because multiple vehicles are returned at the same time, the premium may be missed. Therefore, a system is desired that can properly detect the occurrence of an odor-generating event (hereinafter also referred to as an "odor event") in the vehicle interior, such as soiling that generates a foul odor.

[0003] Patent Document 1 discloses a vehicle management system that includes at least a processor and a memory and manages the status of a vehicle, the vehicle management system being a server separate from the vehicle and including a communication interface for communicating with the vehicle, the processor constituting a data acquisition unit that controls an odor sensor installed inside the vehicle to acquire interior odor data output from the odor sensor via the communication interface, and a vehicle control unit that transmits commands to the vehicle including control data for controlling the vehicle based on the interior odor data, the control data being data for controlling at least one of the vehicle's air conditioning system and the opening and closing of windows. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7085003 Summary of the Invention [Problem to be solved by the invention]

[0005] An odor sensor detects the intensity of odor components contained in the air, but in principle is easily affected by absolute humidity. Therefore, when humid outside air flows into the vehicle cabin, the detection accuracy of the odor sensor installed in the vehicle cabin may decrease. The vehicle management system disclosed in Patent Document 1 does not take such problems into consideration at all, so it cannot accurately detect odor events occurring in the vehicle cabin, and it may be difficult to appropriately evaluate the risk of an odor event. The risk of an odor event is, for example, the risk that a bad odor caused by soiling or the like will remain in the vehicle cabin.

[0006] The present invention has been made in consideration of the above, and aims to appropriately evaluate the risk of an odor event occurring within a vehicle cabin. [Means for solving the problem]

[0007] In order to solve the above problems, the odor event detection system of the present invention is an odor event detection system that detects an odor event that occurs within a vehicle cabin, and includes an odor sensor that is provided within the vehicle cabin and detects the intensity of odor components in the air within the vehicle cabin, and a calculation processing device that is provided in a vehicle having the vehicle cabin and detects the odor event based on the detection result of the odor sensor, wherein the calculation processing device has an intensity judgment unit that determines whether the intensity detected by the odor sensor is above a threshold value, an operation judgment unit that determines whether a purification operation has been performed to purify the air within the vehicle cabin based on each operation signal of the window device, door device, and air conditioning device of the vehicle, and an evaluation unit that detects the occurrence of the odor event and evaluates the risk of the odor event based on the judgment result of the intensity judgment unit and the judgment result of the operation judgment unit. Effect of the Invention

[0008] According to the present invention, the risk of an odor event occurring within a vehicle cabin can be appropriately evaluated. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing the configuration of an odor event detection system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing a functional configuration of the odor event detection system shown in FIG. [Diagram 3] FIG. 3 is a diagram for explaining the processing contents of the evaluation unit shown in FIG. 2 (part 1). [Figure 4] FIG. 3 is a diagram (part 2) for explaining the processing contents of the evaluation unit shown in FIG. 2. [Diagram 5] 3 is a flowchart showing a process executed by the processor shown in FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Components with the same reference numerals in each embodiment have similar components in each embodiment unless otherwise specified, and the description thereof will be omitted.

[0011] Fig. 1 is a diagram showing the configuration of an odor event detection system 1 of the present embodiment. Fig. 2 is a diagram showing the functional configuration of the odor event detection system 1 shown in Fig. 1. Fig. 3 is a diagram (part 1) explaining the processing contents of the evaluation unit 273 shown in Fig. 2. Fig. 4 is a diagram (part 2) explaining the processing contents of the evaluation unit 273 shown in Fig. 2.

[0012] The odor event detection system 1 is a system that detects an odor event that occurs within the cabin of a vehicle 2. The vehicle 2 may be a vehicle that is rented out to a user in a car sharing business, a rental car business, or the like. An odor event is an occurrence that generates an odor, such as soiling that generates a foul odor. An odor event is, for example, a user vomiting, smoking, spilling food or drink, spraying air freshener or perfume, or the like, within the cabin of the vehicle.

[0013] 1, the odor event detection system 1 includes a vehicle 2 equipped with an odor sensor 26, and a management device 3 that manages a plurality of vehicles 2. The vehicles 2 and the management device 3 are connected to each other via an exterior vehicle communication network N so as to be able to wirelessly communicate with each other.

[0014] The vehicle 2 includes a window device 21, a door device 22, an air conditioning device 23, a communication device 24, a vehicle control device 25, an odor sensor 26, and an arithmetic processing device 27. The window device 21, the door device 22, the air conditioning device 23, the communication device 24, the vehicle control device 25, the odor sensor 26, and the arithmetic processing device 27 are connected to each other so as to be able to communicate with each other via an in-vehicle communication network such as a Controller Area Network (CAN).

[0015] The window device 21 is configured with an electric window that opens and closes in response to a user's operation, etc. The window device 21 includes a switch that detects the operation, and outputs an operation signal corresponding to the operation to the vehicle control device 25.

[0016] The door device 22 is composed of a side door and a rear door that open and close in response to a user's operation, and a locking mechanism for those doors, etc. The door device 22 includes a switch that detects the operation, and outputs an operation signal corresponding to the operation to the vehicle control device 25.

[0017] The air conditioner 23 adjusts the temperature and humidity in the vehicle cabin in response to a user's operation, and also ventilates the vehicle cabin. The air conditioner 23 includes a switch that detects the operation, and outputs an operation signal corresponding to the operation to the vehicle control device 25.

[0018] When the window device 21 or the door device 22 in a closed state is opened, the interior of the vehicle 2 is ventilated and the air in the interior is purified. When the air conditioner 23 in a stopped state is operated, the air in the interior is purified by a filter or the like. In this embodiment, the operation of opening at least one of the window device 21 and the door device 22 in a closed state and / or the operation of operating the air conditioner 23 in a stopped state are collectively referred to as a "cleaning operation."

[0019] Furthermore, increasing the opening degree of the window device 21 or the door device 22 in the open state promotes the purification of the air in the vehicle cabin. Increasing the amount of air blown out from the air conditioner 23 in the operating state promotes the purification of the air in the vehicle cabin. In this embodiment, an operation of increasing the opening degree of at least one of the window device 21 and the door device 22 in the open state and / or an operation of increasing the amount of air blown out from the air conditioner 23 in the operating state can also be included in the "purifying operation".

[0020] The communication device 24 is configured with a DCM (Data Communication Module) or the like that communicates with the management device 3 via the external vehicle communication network N. The communication device 24 transmits various information output from the vehicle control device 25 or the arithmetic processing device 27 to the management device 3.

[0021] The vehicle control device 25 is composed of an ECU (Electronic Control Unit) and the like that controls each device mounted on the vehicle 2. The vehicle control device 25 includes a processor and a memory, and the processor executes a program stored in the memory to realize various functions of the vehicle control device 25. In response to a request from the arithmetic processing device 27, the vehicle control device 25 outputs an operation signal for at least one of the window device 21, the door device 22, and the air conditioning device 23 to the arithmetic processing device 27. At this time, the vehicle control device 25 outputs the operation signal including the time when the operation corresponding to the operation signal was performed.

[0022] The odor sensor 26 detects the intensity of odor components in the air inside the vehicle. The odor sensor 26 is composed of a semiconductor sensor, a quartz crystal oscillator sensor, a film-type surface stress sensor, or the like. The odor sensor 26 may be composed of one odor sensor 26 and detect the intensity of multiple types of odor components. The odor sensor 26 may be composed of multiple odor sensors 26 and detect the intensity of multiple types of odor components from the detection patterns of the multiple odor sensors 26. The odor sensor 26 detects the intensity of odor components at predetermined intervals while the vehicle 2 is in use (the vehicle 2 may be running or parked), and outputs a signal indicative of the detection result to the calculation processing device 27.

[0023] The odor sensor 26 is provided in the vehicle interior. The installation position and the number of the odor sensor 26 in the vehicle interior are not particularly limited. The odor sensor 26 may be provided in, for example, the center console or the overhead console.

[0024] The arithmetic processing device 27 is configured with an ECU and the like that detects an odor event based on the detection result of the odor sensor 26. The arithmetic processing device 27 includes a processor and a memory, and the processor executes a program stored in the memory to realize various functions of the arithmetic processing device 27.

[0025] The arithmetic processing device 27 has a strength determination unit 271, an operation determination unit 272, and an evaluation unit 273 as the various functions.

[0026] The intensity determination unit 271 determines whether the intensity of the odor component detected by the odor sensor 26 is equal to or greater than a threshold value. The threshold value may be a preset fixed value, but is preferably a fluctuating value that fluctuates from the fixed value in a time series manner. When the threshold value is a fluctuating value, the intensity determination unit 271 acquires the intensities of multiple odor components detected by the odor sensor 26 at predetermined intervals, and calculates a moving average value of the acquired multiple intensities and a fluctuation range from the moving average value. Then, the intensity determination unit 271 sets the threshold value based on the calculated fluctuation range. For example, the intensity determination unit 271 may calculate a standard deviation as the fluctuation range, and set the value obtained by adding the standard deviation to the moving average value as the threshold value. The intensity determination unit 271 outputs the determination result to the evaluation unit 273, including the time when the intensity of the odor component was detected.

[0027] The operation determination unit 272 determines whether or not a cleaning operation for cleaning the air in the vehicle cabin has been performed based on each operation signal of the window device 21, the door device 22, and the air conditioner 23. Specifically, the operation determination unit 272 outputs an acquisition request for each operation signal to the vehicle control device 25, and acquires each operation signal from the vehicle control device 25. Then, the operation determination unit 272 determines whether or not a cleaning operation has been performed based on each acquired operation signal. The operation determination unit 272 outputs the determination result to the evaluation unit 273. If it is determined that a cleaning operation has been performed, the operation determination unit 272 outputs the determination result including the time when the cleaning operation was performed.

[0028] The evaluation unit 273 detects the occurrence of an odor event and evaluates the risk of the odor event based on the judgment result of the intensity judgment unit 271 and the judgment result of the operation judgment unit 272. The risk of the odor event is, for example, the risk that a bad odor generated by the odor event will remain in the vehicle cabin.

[0029] Specifically, the evaluation unit 273 detects the occurrence of an odor event when the intensity determination unit 271 determines that the intensity of the odor component is equal to or greater than a threshold value. Then, the evaluation unit 273 evaluates the risk of the odor event based on the chronological relationship between the occurrence time of the detected odor event and the execution time of the cleaning operation.

[0030] More specifically, the evaluation unit 273 refers to the determination result of the intensity determination unit 271 and specifies the time when the intensity of the odor component determined to be equal to or greater than the threshold was detected as the time when the odor event occurred.The evaluation unit 273 refers to the determination result of the operation determination unit 272 and specifies the time when the cleaning operation was performed as the time when the cleaning operation was performed.Then, the evaluation unit 273 specifies the chronological relationship between the time when the odor event occurred and the time when the cleaning operation was performed.

[0031] For example, as shown in Fig. 3, the evaluation unit 273 has preset therein a first range, which is a range from the time t0 at which an odor event occurs to a time t1 that is a first time (e.g., 10 seconds) back, and a second range, which is a range from the time t0 at which an odor event occurs to a time t2 that is a second time (e.g., 10 seconds) back, as shown in Fig. 3. The time t0 at which an odor event occurs is included in the second range. The evaluation unit 273 determines whether the time at which the cleaning operation is performed is within the first range or the second range.

[0032] 4, the evaluation unit 273 evaluates the risk of the odor event by taking into account the states of the window device 21, the door device 22, and the air conditioner 23 at the time when the odor event occurs. That is, the evaluation unit 273 evaluates the risk of the odor event to be low if the window device 21 or the door device 22 is open or the air conditioner 23 is in operation at the time when the odor event occurs. This is because if a cleaning operation is performed before the odor event occurs, there is little risk that a bad odor will remain in the vehicle cabin even if it occurs in the vehicle cabin.

[0033] Even if the window device 21 and the door device 22 are closed and the air conditioner 23 is stopped at the time when the odor event occurs, the evaluation unit 273 evaluates that the risk of the odor event is low if the time when the cleaning operation is performed is within the first range. This is because if any cleaning operation is performed before the time when the odor event occurs and the window device 21 is operated to a closed state or the like at the time when the odor event occurs, the odor may be momentary or there may be a possibility of erroneous detection by the odor sensor 26, and therefore the risk that the odor will remain in the vehicle cabin is low.

[0034] 4, when the window device 21 and the door device 22 are closed and the air conditioner 23 is stopped at the time when an odor event occurs, if the time when the cleaning operation is performed is not within the first range but is within the second range, the evaluation unit 273 evaluates that the risk of an odor event is high. This is because if a cleaning operation is performed immediately after the time when an odor event occurs, it is considered that the user immediately performed the cleaning operation to ventilate the vehicle, and there is a high risk that a bad odor will remain in the vehicle cabin.

[0035] When the window device 21 and the door device 22 are closed and the air conditioner 23 is stopped at the time when the odor event occurs, if the time when the cleaning operation is performed is not within the first range and is not within the second range, the evaluation unit 273 evaluates the risk of the odor event as medium. In other words, if the time when the cleaning operation is performed is after the second range, the evaluation unit 273 evaluates the risk of the odor event as medium. This is because when the cleaning operation is performed after the second hour from the time when the odor event occurs, the user does not want to immediately ventilate the vehicle cabin, as with the odor of food and drink, and there is a medium risk of the odor remaining in the vehicle cabin.

[0036] Although not shown in Figure 4, if the window device 21 and the door device 22 are closed and the air conditioning device 23 is stopped at the time when an odor event occurs, and the time when the cleaning operation is performed is before the first range, the evaluation unit 273 can evaluate that the risk of the odor event is low.

[0037] The evaluation unit 273 outputs the evaluation result to the communication device 24. The communication device 24 transmits the risk evaluation result by the evaluation unit 273 to the management device 3 together with the identification information and location information of the vehicle 2. The management device 3 receives the evaluation results transmitted from the multiple vehicles 2 and stores them in a vehicle management database or the like. The management device 3 determines the cleaning timing for each of the multiple vehicles according to the evaluation results and location information. For example, when there are multiple vehicles 2 with the same scheduled return time, the management device 3 prioritizes the cleaning timing of the vehicle 2 that has a high risk of an odor event and is close to the return location over the others and determines an earlier cleaning timing.

[0038] Fig. 5 is a flowchart showing the processing executed by the arithmetic processing device 27 shown in Fig. 2. When the use of the vehicle 2 starts, the arithmetic processing device 27 executes the processing shown in Fig. 5.

[0039] In step S1, the arithmetic processing device 27 acquires the intensity of the odor component detected by the odor sensor .

[0040] In step S2, the arithmetic processing device 27 sets a threshold value based on the fluctuation range of the intensities of the multiple odor components detected by the odor sensor 26 from a moving average value.

[0041] In step S3, the arithmetic processing device 27 determines whether the intensity of the odor component detected by the odor sensor 26 is equal to or greater than the threshold. If the intensity of the odor component is equal to or greater than the threshold, the arithmetic processing device 27 proceeds to step S4. If the intensity of the odor component is less than the threshold, the arithmetic processing device 27 proceeds to step S1.

[0042] In step S4, the arithmetic processing unit 27 acquires operation signals from the window device 21, the door device 22, and the air conditioner .

[0043] In step S5, the arithmetic processing device 27 determines whether the window device 21 and the door device 22 are closed and the air conditioner 23 is stopped, based on the acquired operation signals. If the window device 21 and the door device 22 are closed and the air conditioner 23 is stopped, the arithmetic processing device 27 proceeds to step S6. If the window device 21 or the door device 22 is open or the air conditioner 23 is operating, the arithmetic processing device 27 proceeds to step S8.

[0044] In step S6, the arithmetic processing device 27 determines whether or not a cleaning operation has been performed within a first range that is a first time period prior to the occurrence of the odor event. If a cleaning operation has been performed within the first range, the arithmetic processing device 27 proceeds to step S8. If a cleaning operation has not been performed within the first range, the arithmetic processing device 27 proceeds to step S7.

[0045] In step S7, the arithmetic processing device 27 judges whether or not the cleaning operation has been performed within a second range in which a second time has elapsed since the occurrence of the odor event. If the cleaning operation has been performed within the second range, the arithmetic processing device 27 proceeds to step S9. If the cleaning operation has not been performed within the second range, i.e., if the cleaning operation has been performed after the second range, the arithmetic processing device 27 proceeds to step S10.

[0046] In step S8, the calculation processing device 27 evaluates that the risk of the odor event is low, and proceeds to step S11.

[0047] In step S9, the calculation processing device 27 evaluates that the risk of the odor event is high, and proceeds to step S11.

[0048] In step S10, the calculation processing device 27 evaluates the risk of the odor event as medium, and proceeds to step S11.

[0049] In step S11 , the arithmetic processing device 27 outputs the evaluation result to the communication device 24 , which then transmits it to the management device 3 .

[0050] In step S12, the arithmetic processing device 27 determines whether or not the use of the vehicle 2 has ended. If the use of the vehicle 2 has not ended, the arithmetic processing device 27 proceeds to step S1. If the use of the vehicle 2 has ended due to the return of the vehicle 2, etc., the arithmetic processing device 27 ends the process shown in FIG.

[0051] As described above, the odor event detection system 1 of the present embodiment detects an odor event occurring in a vehicle cabin. The odor event detection system 1 includes an odor sensor 26 that is provided in the vehicle cabin and detects the intensity of an odor component in the air in the vehicle cabin, and a calculation processing device 27 that is provided in a vehicle 2 that has a vehicle cabin and detects an odor event based on the detection result of the odor sensor 26. The calculation processing device 27 includes an intensity determination unit 271 that determines whether the intensity of the odor component detected by the odor sensor 26 is equal to or greater than a threshold value, an operation determination unit 272 that determines whether a cleaning operation for cleaning the air in the vehicle cabin has been performed based on each operation signal of the window device 21, the door device 22, and the air conditioning device 23 of the vehicle 2, and an evaluation unit 273 that detects the occurrence of an odor event and evaluates the risk of the odor event based on the determination result of the intensity determination unit 271 and the determination result of the operation determination unit 272.

[0052] This allows the odor event detection system 1 to evaluate the risk of an odor event occurring in the vehicle cabin by considering the presence or absence of a cleaning operation without relying only on the detection result of the odor sensor 26. Therefore, even if moist outside air flows into the vehicle cabin and the detection accuracy of the odor sensor 26 decreases, the odor event detection system 1 can suppress a decrease in the evaluation accuracy of the risk. Therefore, according to this embodiment, the risk of an odor event occurring in the vehicle cabin can be appropriately evaluated.

[0053] Furthermore, in the odor event detection system 1 of this embodiment, when the intensity determination unit 271 determines that the intensity of the odor component is above a threshold value, the evaluation unit 273 detects the occurrence of an odor event, and evaluates the risk of the odor event based on the chronological relationship between the time of occurrence of the detected odor event and the time of execution of the cleaning operation.

[0054] As a result, the odor event detection system 1 can appropriately evaluate the risk of an odor event occurring in the vehicle cabin by simply comparing the time when the odor event occurred with the time when the cleaning operation was performed without using any special means. Therefore, according to this embodiment, the risk of an odor event occurring in the vehicle cabin can be appropriately and easily evaluated.

[0055] Furthermore, in the odor event detection system 1 of the present embodiment, the odor sensor 26 detects the intensity of odor components at predetermined intervals while the vehicle 2 is in use. The intensity determination unit 271 sets a threshold value based on the fluctuation range from a moving average value of the multiple intensities detected by the odor sensor 26.

[0056] This allows the odor event detection system 1 to accurately detect the occurrence of an odor event even if moist outside air flows into the vehicle cabin. Therefore, the odor event detection system 1 can more accurately identify the chronological relationship between the occurrence of an odor event and the execution of a cleaning operation, and evaluate the risk of the odor event. Therefore, according to this embodiment, the risk of an odor event occurring in the vehicle cabin can be more appropriately evaluated.

[0057] Furthermore, in the odor event detection system 1 of this embodiment, the evaluation unit 273 evaluates the risk of the odor event as low when the time when the cleaning operation is performed is within a first range from the time when the odor event occurred to a time one hour back. The evaluation unit 273 evaluates the risk of the odor event as high when the time when the cleaning operation is performed is not within the first range and is within a second range from the time when the odor event occurred to a time two hours back.

[0058] In this way, the odor event detection system 1 can reliably distinguish between a case where the risk of the odor remaining in the vehicle cabin is low and a case where the risk is high, and evaluate the risk of the odor event. Therefore, according to this embodiment, the risk of the odor event occurring in the vehicle cabin can be more appropriately evaluated.

[0059] Furthermore, in the odor event detection system 1 of the present embodiment, the evaluation unit 273 evaluates that the risk of the odor event is medium when the time point at which the cleaning operation is performed is after the second range.

[0060] In this way, the odor event detection system 1 can reliably distinguish between cases where the risk of a bad odor remaining in the vehicle cabin is medium from cases where the risk is low and cases where the risk is high, and evaluate the risk of an odor event. Therefore, according to this embodiment, the risk of an odor event occurring in the vehicle cabin can be more appropriately evaluated.

[0061] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to each embodiment, and various modifications can be made without departing from the spirit of the present invention. In the present invention, components of one embodiment can be added to components of another embodiment, components of one embodiment can be replaced with components of another embodiment, or some components of one embodiment can be deleted. [Explanation of symbols]

[0062] 1... odor event detection system, 2... vehicle, 21... window device, 22... door device, 23... air conditioning device, 24... communication device, 25... vehicle control device, 26... odor sensor, 27... arithmetic processing device, 271... intensity determination unit, 272... operation determination unit, 273... evaluation unit, 3... management device, N... exterior vehicle communication network

Claims

1. An odor event detection system for detecting an odor event occurring in a vehicle cabin, an odor sensor provided in the vehicle interior and configured to detect an intensity of an odor component in the air in the vehicle interior; a processor that is provided in the vehicle having the passenger compartment and that detects the odor event based on a detection result of the odor sensor; The arithmetic processing device includes: an intensity determination unit that determines whether the intensity detected by the odor sensor is equal to or greater than a threshold; an operation determination unit that determines whether or not a cleaning operation for cleaning the air in the vehicle compartment has been performed based on each operation signal of a window device, a door device, and an air conditioning device of the vehicle; and an evaluation unit that detects the occurrence of the odor event and evaluates a risk of the odor event based on a judgment result of the intensity judgment unit and a judgment result of the operation judgment unit. An odor event detection system comprising:

2. The evaluation unit detects the occurrence of the odor event when the intensity determination unit determines that the intensity is equal to or greater than the threshold value, and evaluates the risk based on a chronological relationship between a time point of occurrence of the detected odor event and a time point of execution of the cleaning operation. The odor event detection system according to claim 1 .

3. The odor sensor detects the intensity at predetermined intervals while the vehicle is in use, The intensity determination unit sets the threshold value based on a fluctuation range from a moving average value of the intensities detected by the odor sensor. The odor event detection system according to claim 2 .

4. The evaluation unit is When the execution time of the cleaning operation is within a first range from the occurrence time of the odor event to a time preceding the occurrence time by a first time, the risk is evaluated as small; When the execution time of the cleaning operation is not within the first range and is within a second range from the occurrence time of the odor event to a time when a second time has elapsed, the risk is evaluated as being high. The odor event detection system according to claim 2 .

5. The evaluation unit evaluates the risk to be medium if the execution time of the cleaning operation is after the second range. The odor event detection system according to claim 4 .

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