Ozone generation control device

Abstract

To provide an ozone generation controller that can accurately determine completion of treatment of an object.SOLUTION: An ozone generation controller comprises: an ozone supply unit which supplies ozone into a target space; an ozone detection unit which detects ozone inside the target space and outputs an ozone concentration value; and a control unit which controls driving of the ozone supply unit on the basis of the ozone concentration value. The control unit determines that treatment of an object inside the target space has not been completed when the reduction speed of the ozone concentration value after the driving of the ozone supply unit is stopped is large, and determines that treatment of the object inside the target space has been completed when the reduction speed is small.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an ozone generation control device. [Background technology]

[0002] Ozone has strong oxidizing power, so ozone generation control devices are used in various fields to control the amount of ozone generated according to the concentration of the target material to be treated, and to remove (deodorize) and sterilize the target material using ozone for the purpose of deodorization, removal of organic matter, removal of harmful substances, sterilization, etc.

[0003] As an ozone generation control device, for example, an air purifier has been disclosed that includes a purifying section that generates ozone to decompose and remove odorous components contained in the air in a space, a purifying substance generating section that generates ozone, a purifying substance concentration sensor that detects the ozone concentration in the air, and a control section that controls the amount of ozone generated according to the ozone concentration detected by the purifying substance concentration sensor (see, for example, Patent Document 1). In this air purifier, when the ozone concentration per unit time in the space is increasing at a predetermined rate, the operation of the purifying substance generating section is stopped to stop the generation of ozone. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019-150735 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology of Patent Document 1 had the problem that it was difficult to accurately determine when the treatment of the target object was completed, because the rate of increase in ozone concentration did not correspond to the treatment status of the target object, such as odorous components.

[0006] Examples of cases in which the rate of increase in ozone concentration does not correspond to the treatment status of the object include cases in which the supply rate of ozone is much higher than the consumption rate of ozone by the object, or the oxidation reaction of the object by ozone is slow, resulting in a small change in the rate of increase in ozone concentration. In addition, there are cases in which the change in the rate of increase in ozone concentration becomes small by increasing the amount of ozone supply when controlling the on / off of ozone generation so that the ozone concentration is constant.

[0007] An object of one aspect of the present invention is to provide an ozone generation control device that can determine with high accuracy the completion of treatment of an object. [Means for solving the problem]

[0008] One aspect of the ozone generation control device according to the present invention is an ozone generation control device comprising an ozone supply unit that supplies ozone into a target space, an ozone detection unit that detects ozone in the target space and outputs an ozone concentration value, and a control unit that drives and controls the ozone supply unit based on the ozone concentration value, wherein the control unit determines that processing of the object in the target space is not complete when the rate of decrease of the ozone concentration value after driving of the ozone supply unit is stopped is large, and determines that processing of the object in the target space is complete when the rate of decrease is small.

[0009] Another aspect of the ozone generation control device of the present invention is an ozone generation control device comprising an ozone supply unit that supplies ozone into a target space, an ozone detection unit that detects ozone in the target space and outputs an ozone concentration value, and a control unit that drives and controls the ozone supply unit based on the ozone concentration value, wherein the control unit determines that the treatment of the object in the target space has not progressed to a predetermined level when the rate of decrease of the ozone concentration value after driving of the ozone supply unit is stopped is large, and determines that the treatment of the object in the target space has progressed to a predetermined level when the rate of decrease is small. Effect of the Invention

[0010] One aspect of the ozone generation control device according to the present invention can determine the completion of treatment of an object with high accuracy. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic configuration diagram showing an ozone generation control device according to a first embodiment. [Diagram 2] FIG. 4 is an explanatory diagram showing the relationship between time and ozone concentration. [Diagram 3] 1 is a flowchart illustrating an ozone treatment method. [Figure 4] 4 is a flowchart showing the operation of the ozone treatment step (step S11) in FIG. [Diagram 5] FIG. 4 is a schematic configuration diagram showing an ozone generation control device according to a second embodiment. [Figure 6] 1 is a flowchart illustrating an ozone treatment method. [Figure 7] FIG. 11 is a schematic configuration diagram showing an ozone generation control device according to a third embodiment. [Figure 8] 1 is a flowchart illustrating an ozone treatment method. [Figure 9] FIG. 11 is a schematic configuration diagram showing an ozone generation control device according to a fourth embodiment of the present invention. [Figure 10] 1 is a flowchart illustrating an ozone treatment method. [Figure 11] FIG. 11 is a schematic configuration diagram showing an ozone generation control device according to a fifth embodiment of the present invention. [Figure 12] 1 is a flowchart illustrating an ozone treatment method. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, the embodiments of the present invention will be described in detail. In order to facilitate understanding of the description, the same components in each drawing are given the same reference numerals, and duplicated descriptions will be omitted. In addition, the scale of each member in the drawings may differ from the actual scale. In this specification, "~" indicating a numerical range means that the numerical values ​​before and after it are included as the lower and upper limits, unless otherwise specified.

[0013] [First embodiment] <Ozone generation control device> An ozone generation control device according to a first embodiment of the present invention will be described below. Note that a target space in which the ozone generation control device is installed contains a target object.

[0014] In this embodiment, the target space refers to an atmosphere in which air is present in a closed space, such as a building such as a house, a building, a hospital, or a welfare facility, a vehicle such as an automobile or a train, or an indoor space such as an airplane. A closed space includes a space that can be considered to be substantially sealed, and air may or may not circulate.

[0015] The targets are volatile organic compounds (VOCs), odorous components, bacteria, viruses, etc. Incidentally, odorous components are malodorous substances and volatile organic compounds, etc., and examples of such substances include trimethylamine, methyl mercaptan, NH3, and H2S.

[0016] Fig. 1 is a schematic diagram showing an ozone generation control device according to this embodiment. As shown in Fig. 1, the ozone generation control device 1A includes an ozone supply unit 10, an ozone concentration sensor 20 as an ozone detection unit, and a control unit 30A, and may also include a temperature sensor 40, a humidity sensor 50, a CO2 sensor 60, and an alarm unit 70. The ozone generation control device 1A is installed in a target space S. The ozone generation control device 1A brings objects present in the target space S into contact with ozone (O3) and removes the objects by oxidative decomposition with the ozone, thereby treating the objects so that their concentrations are reduced to an allowable value or lower, thereby purifying the air in the target space S.

[0017] When removing objects present in the target space S, the ozone generation control device 1A performs feedback control on the operation of the ozone supply unit 10 so that the ozone concentration in the target space S is maintained within a predetermined range. The ozone generation control device 1A determines whether removal of the objects in the target space S has been completed based on the rate of decrease in the ozone concentration when the operation of the ozone supply unit 10 is stopped.

[0018] In general, conventional technologies can control the ozone concentration in a space within a predetermined range, but it is difficult to grasp the state of treatment of the target object, such as the deodorization rate of malodors and the sterilization rate of bacteria and viruses, while ozone is being generated. Therefore, conventional technologies often continue to generate ozone and control the ozone concentration in the space even if the removal of the target object (deodorization, sterilization, etc.) is sufficiently completed. In addition, when removing the target object (deodorization, sterilization, etc.) in a manned environment, even if the ozone concentration is a safe concentration, people in the space are exposed to unnecessary ozone, and it is possible that they will feel an unpleasant ozone odor.

[0019] The ozone generation control device 1A estimates the amount of ozone consumed based on the rate at which the ozone concentration decreases, so that the removal of objects (deodorization, sterilization, etc.) from the target space S can be continued until the concentration falls below a predetermined target concentration, and it is possible to grasp in real time that the air in the target space S is being purified.

[0020] Each component of the ozone generation control device 1A will be described.

[0021] The ozone supplying unit 10 generates ozone in the target space S using oxygen in the air in the target space S as a raw material, and supplies the ozone to the target space S. The ozone supplying unit 10 is electrically connected to the control unit 30A and is controlled by the control unit 30A. The ozone supplying unit 10 can generate ozone based on a drive signal sent from the control unit 30A.

[0022] Any type of ozone supplying unit can be used as long as it can generate ozone. For example, the ozone supplying unit 10 can be a device that generates ozone using a discharge method in which discharge electrodes and counter electrodes are alternately arranged facing each other, or a device that generates ozone using a photochemical reaction method using ultraviolet light.

[0023] In a device that generates ozone using a discharge method, a voltage is applied to both electrodes to generate a discharge between the two electrodes. By passing air between the electrodes generating the discharge, the oxygen contained in the air is activated, and some of the dissociated or excited oxygen is converted into ozone (O3). This generates ozone in the air. The generated ozone reacts with the target object contained in the air in the target space S to decompose and remove the target object. The amount of ozone generated in the ozone supply unit 10 (ozone generation amount) can be increased or decreased, started, stopped, etc., by adjusting the amount of discharge by adjusting the drive signal output from the control unit 30A.

[0024] As a device for generating ozone by utilizing a photochemical reaction method using ultraviolet rays, an ultraviolet irradiation device equipped with an ultraviolet lamp that emits ultraviolet rays can be used. As the ultraviolet lamp, for example, a low-pressure mercury lamp or an excimer lamp can be used, but it is preferable to use an excimer lamp that can emit light that does not include ozone decomposition wavelengths.

[0025] The ozone concentration sensor 20 measures the ozone concentration in the target space S. The ozone concentration sensor 20 outputs a detection value (ozone concentration value) corresponding to the measured ozone concentration. The ozone concentration sensor 20 is electrically connected to the control unit 30A and transmits an ozone concentration detection signal (concentration signal) corresponding to the ozone concentration value to the control unit 30A.

[0026] The ozone concentration sensor 20 is not particularly limited and can be selected appropriately. For example, a semiconductor sensor having a semiconductor element as a gas-sensing part made of a metal oxide semiconductor material can be used as the ozone concentration sensor 20. In the semiconductor sensor, the ozone concentration is measured by detecting the amount of change in the resistance value of the semiconductor element caused by ozone coming into contact with the surface of the semiconductor element, and a voltage signal corresponding to the ozone concentration is output as an ozone concentration value.

[0027] The control unit 30A is connected to each of the components constituting the ozone generation control device 1A, such as the ozone supply unit 10, so as to be able to control these components. The control unit 30A has a storage means for storing a control program and various types of storage information, and a calculation means for operating based on the control program. The control unit 30A is realized by the calculation means reading and executing the control program, etc., stored in the storage means.

[0028] The control unit 30A controls the drive of the ozone supply unit 10 based on the ozone concentration value measured by the ozone concentration sensor 20, and controls the amount of ozone generated by the ozone supply unit 10. Specifically, the control unit 30A receives a concentration signal corresponding to an ozone concentration value, which is a measurement result of the ozone concentration measured by the ozone concentration sensor 20. The control unit 30A calculates the ozone concentration in the target space S based on the concentration signal received from the ozone concentration sensor 20. The control unit 30A calculates a drive output value for generating ozone in the ozone supply unit 10 based on the calculated ozone concentration. The control unit 30A transmits a drive signal corresponding to the calculated drive output value to the ozone supply unit 10, and controls the amount of ozone generated by the ozone supply unit 10. The control unit 30A may also control the ozone supply unit 10 to generate ozone at a predetermined concentration from the ozone supply unit 10.

[0029] The ozone concentration may be within a range below a standard value that is safe for the human body, and can be set appropriately depending on the size of the symmetric space S, the type, number, and concentration of the objects, etc. The ozone concentration is preferably, for example, 0.1 ppm or less.

[0030] The control unit 30A determines that the processing of the object in the target space S is not complete when the rate of decrease of the ozone concentration value after the driving of the ozone supply unit 10 is stopped is large, and determines that the processing of the object in the target space S is complete when the rate of decrease is small. That is, the control unit 30A makes the determination based on the amount of change in the rate of decrease of the ozone concentration value per unit time from the stopping of the driving of the ozone supply unit 10 to the restart of the driving. The control unit 30A determines that the processing of the object in the target space S is not complete when the rate of decrease of the ozone concentration value after the driving of the ozone supply unit 10 is stopped exceeds a predetermined reference value, and determines that the processing of the object in the target space S is complete when the rate of decrease of the ozone concentration value is equal to or less than the predetermined reference value.

[0031] The reference value is not particularly limited and is set appropriately depending on the type of object, etc.

[0032] The control unit 30A can start driving the ozone supplying unit 10 when the ozone concentration value becomes equal to or lower than a start threshold, and can stop driving the ozone supplying unit 10 when the ozone concentration value becomes equal to or higher than a stop threshold.

[0033] The start threshold can be set to any ozone concentration value as appropriate depending on the type of object, etc. The stop threshold is an ozone concentration value higher than the start threshold, and can be set to any ozone concentration value as appropriate depending on the type of object, etc. The start threshold and the stop threshold may be concentration values ​​that maintain the ozone concentration in the target space S at a safe concentration, and the start threshold may be, for example, 0.08 ppm, and the stop threshold may be, for example, 0.1 ppm.

[0034] An example of the relationship between the measurement time of the ozone concentration sensor 20 and the ozone concentration in the target space S is shown in Fig. 2. As shown in Fig. 2, when a target object or the like is present in the treatment space S and the air in the treatment space S is contaminated, the off time T during which the operation of the ozone supply unit 10 is stopped is off The time t1 is the ON time T on At time t 11 When there are almost no objects in the processing space S and the processing space S is cleaned, the off time T offis set as time t0, and the on-time T on At time t 10 The ozone concentration value when the ozone concentration is the start threshold is C11, and the ozone concentration value when the ozone concentration is the stop threshold is C12. The ozone concentration in the target space S is maintained at a safe concentration (e.g., 0.08 ppm to 0.1 ppm) between the start threshold and the stop threshold.

[0035] The off time T when the air in the processing space S is contaminated off The decrease rate of ozone at (time t1) (the decrease rate of ozone during the time from the start threshold C11 to the stop threshold C12) is the OFF time T off The decrease rate of ozone (at time t0) is greater than the decrease rate of ozone (the decrease rate of ozone from the time when the ozone concentration value is from the start threshold C11 to the stop threshold C12).

[0036] That is, the off time T off In this case, ozone is consumed by reacting with the object to be treated, and no new ozone is supplied from the ozone supply unit 10, so the ozone concentration decreases. If the object remains in the target space S, the ozone concentration in the target space S further decreases, so the off time T off The rate at which the ozone concentration decreases at the target space S becomes even greater. Therefore, if the rate at which the ozone concentration value decreases is large and exceeds a predetermined rate after the supply of ozone from the ozone supply unit 10 is stopped, the control unit 30A can determine that the processing of the object in the target space S has not been completed until the ozone concentration value decreases to a predetermined concentration or less. If the rate at which the ozone concentration value decreases is small and is equal to or less than the predetermined rate, the control unit 30A can determine that the processing of the object in the target space S has been completed until the ozone concentration value decreases to a predetermined concentration or less.

[0037] In this embodiment, the predetermined speed is appropriately selected depending on the type of object, the initial concentration of the object, the temperature, the humidity, and the like.

[0038] Off time T off(Times t0, t1) are not uniquely determined by the ozone concentration alone, but are preferably adjusted by appropriate correction taking into consideration the temperature and humidity of the air in the treatment space S measured by the temperature sensor 40 and the humidity sensor 50. Since the half-life due to natural decomposition of ozone tends to depend on temperature and humidity, the off time T off (Times t0, t1) can be calculated more appropriately.

[0039] When calculating the rate of decrease in ozone concentration, the control unit 30A can use, for example, the difference in ozone concentration values ​​between the stop threshold C12 and the start threshold C11 relative to the difference in time between the stop threshold C12 and the start threshold C11, as shown in the following equation (1). (stop threshold C12-start threshold C11) / (time of stop threshold C12-time of start threshold C11) (1)

[0040] In addition, the control unit 30A determines the off time T off For example, the ratio of the difference in ozone concentration value to the difference in time between any two points in the graph can be used.

[0041] The control unit 30A may store the relationship between time and ozone concentration in the storage unit in advance. In this case, the control unit 30A can compare the stored value stored in the storage unit with the actual value measured by the ozone concentration sensor 20 and the operating time of the ozone supply unit 10 to determine whether the oxidation of the target object present in the target space S is completed.

[0042] In addition, the control unit 30A may determine that the processing of the objects in the target space S has not progressed to the specified processing when the rate of decrease in the ozone concentration value after the operation of the ozone supply unit 10 is stopped is large, and may determine that the processing of the objects in the target space S has progressed to the specified processing when the rate of decrease is small.

[0043] The predetermined processing is, for example, an indicator of the progress of processing of the object in the target space S, such as a safe level, a normal level, a level requiring caution, a dangerous level, or the like.

[0044] The temperature sensor 40 measures the temperature within the processing space S. The temperature sensor 40 is not particularly limited, and a general thermometer or the like can be used.

[0045] The humidity sensor 50 measures the humidity within the processing space S. The humidity sensor 50 is not particularly limited, and a general hygrometer or the like can be used.

[0046] The CO2 sensor 60 measures the CO2 concentration in the processing space S. The CO2 sensor 60 is not particularly limited, and a general CO2 measuring meter or the like can be used.

[0047] The notification unit 70 has a function of notifying the result of the calculation by the control unit 30A. The notification unit 70 can notify the completion of the target process by displaying, outputting a sound, generating a vibration, etc. The function 0 can be a monitor, an alarm, a vibration, etc.

[0048] For example, as shown in Figure 2, the off time T off Between time t1 and time t0 (t1 <T off ≦t0). In this case, the off time T off The rate of decrease in the ozone concentration at <T off ≦t0), and it can be said that the inside of the target space S is in a state of being purified at least to a normal level or higher. In this case, the notification unit 70 may display that the level is above the normal level (for example, displaying level 1), turn on a white lamp, or the like.

[0049] Off time T off is less than time t1 (T off ≦t1). In this case, the off time T off The rate of decrease in ozone concentration at time t1 or less (T off≦t1), and it can be said that the target space S is in a state in which at least purification is required. In this case, the notification unit 70 may display the fact that purification is required (for example, displaying level 2 or a ventilation mark), turn on a red lamp, etc.

[0050] In addition, when the target space S is ventilated in order to purify the target space S, the ozone in the target space S is also discharged from the target space S during the off time T off becomes substantially the same as time t0 or less. Therefore, the control unit 30A cannot distinguish between a state in which purification is necessary, particularly a dangerous level state in which ozone consumption is very high, and a state in which purification is unnecessary. In this case, the control unit 30 may determine that the symmetric space S is being ventilated when the CO2 concentration decreases, and may determine that ventilation is not being performed and that the target space S is in a state (dangerous level) in which the processing capacity (e.g., deodorization and sterilization capacity) of ozone is insufficient when the CO2 concentration does not decrease.

[0051] In addition, when the control unit 30A determines the progress of the processing of the object in the target space S depending on the rate of decrease in the ozone concentration value after the operation of the ozone supply unit 10 is stopped, the notification unit 70 may notify the progress of the processing of the object by displaying, outputting sound, generating vibrations, etc.

[0052] For example, as shown in FIG. 2, when the target space S is being purified, the off time T off is time t o In this case, the off time T off The rate of decrease in ozone concentration at time t o The ozone concentration is decreasing at a rate equal to the rate at which the ozone concentration decreases, the ozone is naturally decomposed, purification is completed, and the operation of the ozone supply unit 10 may be stopped. In this case, the notification unit 70 may display that the level is safe (for example, displaying level 0), turn on a white lamp, or the like.

[0053] Off time T off is between time t1 and time t0 (t1≦T offAssume that it is <t0). In this case, the rate of decrease of the ozone concentration during the off-time T off is the rate of decrease of the ozone concentration between time t1 or more and less than time t0 (t1 ≦ T off <t0), and the inside of the target space S is in a state of being purified to the normal level. It can be said that the supply power to the ozone supply unit 10 may be minimized and the operation of the ozone supply unit 10 may be continued. In this case, the notification unit 70 may display that it is at the normal level (for example, display of level 1), turn on a blue lamp, etc.

[0054] The off-time T off is assumed to be between time t2 or more and less than time t1 (t2 ≦ T off <t1). In this case, the rate of decrease of the ozone concentration during the off-time T off is the rate of decrease of the ozone concentration between time t2 or more and less than time t1 (t2 ≦ T off <t1), and the inside of the target space S is in a state of the level requiring attention. It can be said that the supply power to the ozone supply unit 10 may be maximized and the operation of the ozone supply unit 10 may be continued. In this case, the notification unit 70 may display that it is at the level requiring attention (for example, display of level 2), turn on a yellow lamp, etc.

[0055] The off-time T off is assumed to exceed 0 hour and be less than time t2 (0 < T off ≦ t2). In this case, the rate of decrease of the ozone concentration during the off-time T off is the rate of decrease of the ozone concentration at time t2 or less, and it can be said that the deodorizing and sterilizing ability by ozone in the target space S is insufficient and it is in a dangerous level state. In this case, the notification unit 70 may display that it is at the dangerous level (for example, display of level 3), turn on a red lamp, display a ventilation recommendation mark, etc.

[0056] Note that the off-time T offWhen the time is 0 hours, the ozone concentration in the predetermined space S does not reach a predetermined value (for example, 10 ppm) even if ozone is supplied from the ozone supply unit 10. Therefore, in this case, the control unit 30A may notify the user by displaying only a ventilation recommendation mark or the like through the notification unit 70 to encourage the user to use ventilation or other measures in combination.

[0057] In addition, since the ozone consumption in the target space S is at a dangerous level, when the target space S is ventilated, the ozone in the target space S is also discharged from the target space S as described above, and the off time T off becomes substantially equal to time t or less. Therefore, the control unit 30A cannot distinguish whether the state in the target space S is at a dangerous level or a state in which purification is not required. In this case, the control unit 30 may determine that the target space S is being ventilated when the CO2 concentration decreases, and may determine that ventilation is not being performed and the target space S is at a dangerous level when the CO2 concentration does not decrease.

[0058] <Ozone treatment method> Next, an example of an ozone treatment method for removing objects present in the target space S using the ozone generation control device 1A having the above configuration will be described. Fig. 3 is a flow chart for explaining the ozone treatment method. As shown in Fig. 3, the control unit 30A controls the operation of the ozone supply unit 10 to treat the objects present in the target space S with ozone (ozone treatment process: step S11).

[0059] The method of ozone treatment of an object in the ozone treatment step (step S11) will be described. FIG. 4 is a flow chart showing the operation of the ozone treatment step (step S11) in FIG. 3. As shown in FIG. 4, in the ozone treatment step (step S11), the ozone supply unit 10 is operated to generate ozone in the object space S by the ozone supply unit 10 (step S111). When the ozone is generated, the object present in the air in the object space S reacts with the ozone and is oxidized and decomposed.

[0060] Next, the ozone concentration sensor 20 measures the ozone concentration in the target space S, outputs an ozone concentration value corresponding to the ozone concentration, and sends it to the control unit 30A. The control unit 30A calculates the ozone concentration in the target space S based on the ozone concentration value output from the ozone concentration sensor 20 (step S112).

[0061] The ozone concentration sensor 20 may transmit the ozone concentration value to the control unit 30A continuously or at predetermined time intervals.

[0062] Next, the control unit 30A determines whether the calculated ozone concentration is equal to or higher than a stop threshold value (step S113).

[0063] In step S113, if the ozone concentration is less than the stop threshold (step S113: No), ozone is being consumed by reacting with the target object while being supplied from the ozone supply unit 10, and the ozone concentration in the target space S is within the standard range safe for the human body. The control unit 30A determines that the ozone concentration in the target space S is within the standard range safe for the human body, and measures the ozone concentration in the target space S again with the ozone concentration sensor 20 (step S112).

[0064] In step S113, if the ozone concentration is equal to or higher than the stop threshold (step S113: Yes), it can be said that the amount of ozone remaining after being supplied from the ozone supply unit 10 is excessive. The control unit 30A determines that the ozone concentration in the target space S exceeds the standard range safe for the human body, and stops the operation of the ozone supply unit 10 (step S114).

[0065] When the operation of the ozone supply unit 10 stops, the supply of ozone from the ozone supply unit 10 to the target space S stops, and no new ozone is supplied to the target space S. Furthermore, if a target object exists in the target space S, ozone reacts with the target object and is consumed. Furthermore, the ozone in the target space S naturally decomposes. Therefore, when the operation of the ozone supply unit 10 stops, the ozone concentration in the target space S decreases over time.

[0066] Next, the control unit 30A measures the ozone concentration in the target space S based on the ozone concentration value output from the ozone concentration sensor 20 (step S115), and determines whether the calculated ozone concentration is equal to or lower than the start threshold value (step S116).

[0067] In step S116, if the ozone concentration is higher than the start threshold (step S116: No), the control unit 30A determines that ozone is present in the target space S, but that the ozone concentration in the target space S is within the standard range safe for the human body, and again measures the ozone concentration in the target space S using the ozone concentration sensor 20 (step S115).

[0068] In step S116, if the ozone concentration is below the start threshold (step S116: Yes), the control unit 30A determines that there is not enough ozone in the target space S to treat the target object, and that there is a high possibility that the concentration of ozone present in the target space S exceeds the concentration at which oxidation of the target object can be determined to be complete.

[0069] As shown in FIG. 3, after the ozone treatment step (step S11), the control unit 30A starts the off time T off The rate of decrease in the ozone concentration in the target space S is calculated (step S12), and it is determined whether or not the calculated rate of decrease in the ozone concentration is equal to or lower than a predetermined rate (step S13).

[0070] The rate of decrease in ozone concentration can be calculated using the above formula (1) or the like.

[0071] In this embodiment, the predetermined speed is appropriately selected depending on the type of the object, the initial concentration of the object, and the like.

[0072] In step S13, the time T off If the rate of decrease in the ozone concentration in the treatment space S is equal to or lower than the predetermined rate (step S13: Yes), the control unit 30A determines that the treatment of the object in the treatment space S is completed, and ends the process.

[0073] For example, the off time T offThe rate of decrease in ozone concentration at is like the rate of decrease in ozone concentration at time t shown in FIG. 2. When the ozone in the target space S is in a state of natural decomposition and the purification of the target space S is completed, the control unit 30A ends the overall process while keeping the operation of the ozone supply unit 10 stopped. o When the rate of decrease in ozone concentration is like the rate of decrease in ozone concentration at time t shown in FIG. 2, that is, when the ozone in the target space S is in a state of natural decomposition and the purification of the target space S is completed, the control unit 30A ends the overall process while keeping the operation of the ozone supply unit 10 stopped.

[0074] Also, the control unit 30A may stop the operation of the ozone generation control device 1A.

[0075] Also, in step S13, when the rate of decrease in ozone concentration is below a predetermined rate (step S13: Yes), the control unit 30A may cause the calculation result to be notified to the user by the notification unit 70.

[0076] Based on the determination result of step S13, the notification unit 70 may perform a display corresponding to the purified state in the symmetric space S (for example, displays such as levels 0, 1, and 2, ventilation marks, etc.), lighting of lamps (for example, white lamp, blue lamp, yellow lamp, red lamp, etc.), alarms, vibrations, etc.

[0077] In step S13, the off-time T off When the rate of decrease in ozone concentration at exceeds the predetermined rate (step S13: No), it is determined that the processing of the object in the target space S is not completed. Then, the control unit 30A drives the ozone supply unit 10 again to generate ozone and processes the object existing in the target space S with the ozone (ozone treatment step: step S11).

[0078] For example, when the rate of decrease in ozone concentration at the off-time T off is like the rate of decrease in ozone concentration between time t1 or more and less than time t0 shown in FIG. 2 (t1 ≦ T off < t0), that is, when the target space S is in a state of being purified to the normal level, the control unit 30A may operate while minimizing the supply power to the ozone supply unit 10.

[0079] Also, the off-time T offThe rate of decrease in ozone concentration at time t1 or less (T off When the cleaning level within the target space S is at a level requiring caution, such as when the rate of decrease in ozone concentration at time t1), the control unit 30A may operate the ozone supply unit 10 while supplying maximum power to the ozone supply unit 10.

[0080] In this way, according to the ozone treatment method of this embodiment, ozone can be generated and stopped at optimal timing in the treatment space S. Therefore, by using the ozone treatment method of this embodiment, it is possible to maintain the ozone concentration in the target space S at a safe concentration (e.g., 0.08 ppm to 0.1 ppm), decompose the target in the target space S, and suppress generation of excess ozone in the ozone supply unit 10.

[0081] In the ozone treatment method shown in Figures 3 and 4, the ozone concentration in the target space S is gradually reduced by stopping the ozone supply unit 10 to prevent ozone generation, but since it is only necessary to reduce the ozone concentration in the target space S, the amount of ozone generated may be controlled to be gradually reduced without stopping the ozone supply unit 10.

[0082] 3 and 4 can be performed in the same way when the control unit 30A determines the progress of the treatment of the object in the target space S depending on the rate of decrease in the ozone concentration value after the driving of the ozone supply unit 10 is stopped. In this case, in step S13 shown in FIG. 3, the off time T off If the rate of decrease in the ozone concentration in the treatment space S is equal to or lower than the predetermined rate (step S13: Yes), it is determined that the treatment of the object in the treatment space S has reached a predetermined level, and the process ends.

[0083] If the rate at which the ozone concentration decreases per unit time exceeds a predetermined rate (step S13: No), it is determined that the treatment of the object in the treatment space S has not reached a predetermined level, and the ozone supply unit 10 is driven again to generate ozone, and the object present in the treatment space S is treated with the ozone (ozone treatment process: step S11).

[0084] Even in this case, the ozone treatment method of this embodiment can generate and stop ozone in the treatment space S at optimal timing, so that the ozone concentration in the target space S can be maintained at a safe concentration (e.g., 0.08 ppm to 0.1 ppm), the target object in the target space S can be decomposed, and the generation of excess ozone in the ozone supply unit 10 can be suppressed.

[0085] As described above, the ozone generation control device 1A includes the ozone supply unit 10, the ozone concentration sensor 20, and the control unit 30A. The control unit 30A determines that the treatment of the objects in the target space S is not complete when the rate of decrease in the ozone concentration value after the operation of the ozone supply unit 10 is stopped is large, and determines that the treatment of the objects in the target space S is complete when the rate of decrease is small. The rate of decrease in the ozone concentration value is determined by the off time T of the ozone supply unit 10. off The ozone generation control device 1A is calculated from the amount of decrease in the ozone concentration in the target space S and varies according to the processing status of the objects in the target space S. The more objects there are in the target space S and the more contaminated the target space S is with the objects, the faster the ozone is consumed, and the greater the decrease rate of the ozone concentration value. On the other hand, the fewer the objects there are in the target space S and the cleaner the target space S is, the less the ozone is consumed, and the smaller the decrease rate of the ozone concentration value. The ozone generation control device 1A controls the operation of the ozone supply unit 10 based on the decrease rate of the ozone concentration value calculated by the control unit 30A, thereby reliably decomposing the objects in the target space S to a state where there is almost no ozone consumption and reducing the concentration to an allowable level or lower, and therefore it is possible to determine with high accuracy that the processing of the objects in the target space S has been completed.

[0086] Furthermore, ozone generation control device 1A determines the completion of processing of objects present in target space S based on the degree of decrease in the rate of decrease in ozone concentration, and therefore can suppress generation of excess ozone in ozone supply unit 10 while decomposing the objects in target space S. Furthermore, ozone generation control device 1A can generate ozone again based on the degree of decrease in the rate of decrease in ozone concentration, and therefore can start generating ozone in ozone supply unit 10 at optimal timing. Thus, ozone generation control device 1A can reduce the consumption of energy required for generating ozone.

[0087] In the ozone generation control device 1A, the control unit 30A can start driving the ozone supply unit 10 when the ozone concentration value becomes equal to or lower than the start threshold, and can stop driving the ozone supply unit 10 when the ozone concentration value becomes equal to or higher than the stop threshold. When the ozone concentration value is equal to or lower than the stop threshold and equal to or higher than the start threshold, the ozone generation control device 1A can easily determine that ozone is present in the target space S and that the ozone concentration in the target space S is within a standard range that is safe for the human body. Therefore, the ozone generation control device 1A can more appropriately operate the ozone supply unit 10 based on the stop threshold and the start threshold, and can more accurately and easily treat the target object.

[0088] The ozone generation control device 1A may determine that the treatment of the object in the target space S has not progressed to a predetermined treatment when the rate of decrease in the ozone concentration value after the drive of the ozone supply unit 10 is stopped is large, and may determine that the treatment of the object in the target space S has progressed to a predetermined treatment when the rate of decrease is small. In this case, the ozone generation control device 1A can grasp the progress of the treatment of the object in the target space S based on the degree of decrease in the rate of decrease in the ozone concentration value. Therefore, based on the rate of decrease in the ozone concentration value calculated by the control unit 30A, the ozone generation control device 1A operates the ozone supply unit 10 for a longer period of time and generates a larger amount of ozone, thereby reliably decomposing the object in the treatment space S to a state where there is almost no ozone consumption or close to that, and reducing the concentration to an allowable level or less. Therefore, even in this case, the ozone generation control device 1A can determine with high accuracy that the treatment of the object in the treatment space S has been completed.

[0089] [Second embodiment] An ozone generation control device according to a second embodiment of the present invention will be described. Fig. 5 is a schematic configuration diagram showing an ozone generation control device according to this embodiment. As shown in Fig. 5, an ozone generation control device 1B according to this embodiment is obtained by replacing the control unit 30A of the ozone generation control device 1A according to the above-mentioned first embodiment with a control unit 30B. This embodiment is similar to the ozone generation control device 1A according to the first embodiment except for the configuration of the control unit 30B, so only the configuration of the control unit 30B will be described.

[0090] When removing the target object present in the target space S, the ozone generation control device 1B performs feedback control on the operation of the ozone supply unit 10 so as to maintain the ozone concentration in the target space S within a predetermined range, and stops the operation of the ozone supply unit 10. The ozone generation control device 1B controls the off time T off By estimating the ozone consumption rate based on the above, the removal of the objects in the target space S can be continued until the concentration drops below a predetermined target concentration, and it can be accurately determined that the removal of the objects in the target space S has been completed.

[0091] The control unit 30B determines the magnitude of the decrease rate of the ozone concentration value in the control unit 30A based on the off time T off It is judged by the length of.

[0092] As shown in Figure 2, the off time T off The off time T is shorter at time t1 than at time t0, and the rate at which the ozone concentration value decreases is greater. When the processing space S is contaminated with a target object or the like, the rate at which the ozone concentration value decreases is greater than when the processing space S is cleaned. off Therefore, the rate of decrease in the ozone concentration value increases with the off time T off The greater the rate of decrease in the ozone concentration value, the greater the length of the off time T off The lower the rate of decrease in the ozone concentration value, the lower the off time T off will be longer.

[0093] The control unit 30B controls the off time T off When the off time T off When the off time T off If the off time T is less than the predetermined time, it is determined that the processing of the object in the target space S is not completed, and the off time T off When the time is equal to or greater than the predetermined time, it is determined that the processing of the object in the object space S is completed.

[0094] The predetermined time is not particularly limited and is set appropriately depending on the type of the object, etc. The predetermined time is, for example, the time during which there is enough ozone to treat the object in the symmetric space S and the concentration of the object is below the concentration at which it can be determined that oxidation is complete.

[0095] An example of an ozone treatment method for removing targets present in the target space S using the ozone generation control device 1B having the above configuration will be described.

[0096] Fig. 6 is a flow chart for explaining the ozone treatment method. As shown in Fig. 6, the control unit 30B controls the operation of the ozone supply unit 10 to treat the target object present in the target space S with ozone (ozone treatment step: step S21). The ozone treatment step (step S21) is similar to the ozone treatment step (step S11) of the ozone treatment method shown in Fig. 3, so details are omitted.

[0097] After the ozone treatment step (step S21), the control unit 30B turns off the off (Step S22), and the off time T off It is determined whether or not the time is equal to or longer than a predetermined time (step S23).

[0098] In step S23, the off time T off If the time is equal to or longer than the predetermined time (step S23: Yes), the control unit 30B determines that the processing of the object in the treatment space S is completed, and ends the processing.

[0099] In step S23, the off time T off If the predetermined time is not reached (step S23: No), the control unit 30B determines that the treatment of the object in the treatment space S is not completed. Then, the control unit 30B drives the ozone supply unit 10 again to generate ozone, and treats the object present in the treatment space S with the ozone (ozone treatment process: step S21).

[0100] According to the ozone treatment method of this embodiment, like the ozone treatment method of the first embodiment, ozone can be generated and stopped at optimal timing in the treatment space S. Therefore, by using the ozone treatment method of this embodiment, it is possible to maintain the ozone concentration in the target space S at a safe concentration (e.g., 0.08 ppm to 0.1 ppm), decompose the target in the target space S, and suppress the generation of excess ozone in the ozone supply unit 10.

[0101] The ozone generation control device 1B controls the off time T offWhen the off time T off When the off time T of the ozone supply unit 10 is long, the ozone generation control device 1B determines that the treatment of the object is completed. off By controlling the operation of the ozone supply unit 10 based on the length of the ozone supply unit 10, the object in the treatment space S can be decomposed reliably to a state where there is almost no ozone consumption, and the concentration can be reduced to an allowable level or less, and it is possible to easily determine whether or not the treatment of the object has been completed. Therefore, the ozone generation control device 1B can easily and accurately determine whether the treatment of the object in the treatment space S has been completed.

[0102] In addition, the ozone generation control device 1B has an off time T off Since the completion of the treatment of the object present in the target space S is determined based on the extent to which the length of the off time T off Since ozone can be generated again based on the extent to which the length of the ozone supply unit 10 has been extended, ozone generation can be started at an optimal timing. Therefore, the ozone generation control device 1B can reduce the consumption of energy required for ozone generation.

[0103] [Third embodiment] An ozone generation control device according to a third embodiment of the present invention will be described. Fig. 7 is a schematic configuration diagram showing an ozone generation control device according to this embodiment. As shown in Fig. 7, an ozone generation control device 1C according to this embodiment is obtained by replacing the control unit 30B of the ozone generation control device 1B according to the second embodiment with a control unit 30C. This embodiment is similar to the ozone generation control device 1B according to the second embodiment except for the configuration of the control unit 30C, so only the configuration of the control unit 30C will be described.

[0104] The control unit 30C controls the control unit 30B to calculate the magnitude of the decrease rate of the ozone concentration value based on the off time T offThe ON time T from when the ozone supply unit 10 is restarted to when it is stopped is set to the length of on The judgment is based on the cumulative time, including the length of the

[0105] As shown in Figure 2, the on-time T on is time t 11 and time t 10 In both cases, the on-time T on (Time t 11 and time t 10 ) are both off times T off (time t1, time t0). Therefore, the off time T off When judging the difference between the off time T off and on-time T on If we judge it based on the cumulative time of the off time T off The differences can be judged as substantially equivalent.

[0106] The control unit 30C determines the ON time T on and off time T off The controller 30C determines that the processing of the object in the target space S is not completed when the cycle is short, and determines that the processing of the object in the target space S is completed when the cycle is long. on and off time T off If the period consisting of these is less than a predetermined time, it is determined that the processing of the objects in the target space S is not complete, and if the period is equal to or greater than the predetermined time, it is determined that the processing of the objects in the target space S is complete.

[0107] The predetermined time is not particularly limited and is set appropriately depending on the type of object, etc. The predetermined time is, for example, the on-time T on This is the combined time.

[0108] An example of an ozone treatment method for removing targets present in the target space S using the ozone generation control device 1C having the above configuration will be described.

[0109] Fig. 8 is a flow chart for explaining the ozone treatment method. As shown in Fig. 8, the control unit 30C controls the operation of the ozone supply unit 10 to treat the target object present in the target space S with ozone (ozone treatment step: step S31). The ozone treatment step (step S31) is similar to the ozone treatment step (step S11) of the ozone treatment method shown in Fig. 3, so details are omitted.

[0110] After the ozone treatment step (step S31), the control unit 30C turns off the off and ON time Ton are calculated (step S32), and OFF time T off and on-time T on Then, a period consisting of the above is calculated (step S33).

[0111] Next, control unit 30C determines whether or not the calculated period is equal to or longer than a predetermined time (step S34).

[0112] In step S34, the off time T off and on-time T on If the period is equal to or longer than the predetermined time (step S34: Yes), the control unit 30C determines that the processing of the object in the treatment space S is completed, and ends the processing.

[0113] In step S34, if the period does not reach the predetermined time (step S34: No), the control unit 30C determines that the treatment of the object in the treatment space S is not completed. Then, the control unit 30C drives the ozone supply unit 10 again to generate ozone, and treats the object present in the treatment space S with the ozone (ozone treatment process: step S31).

[0114] According to the ozone treatment method of this embodiment, like the ozone treatment method of the first embodiment, ozone can be generated and stopped at optimal timing in the treatment space S. Therefore, by using the ozone treatment method of this embodiment, it is possible to maintain the ozone concentration in the target space S at a safe concentration (e.g., 0.08 ppm to 0.1 ppm), decompose the target in the target space S, and suppress the generation of excess ozone in the ozone supply unit 10.

[0115] The ozone generation control device 1C controls the ON time T on and off time T off When the period consisting of the off time T of the ozone supply unit 10 is short, it is determined that the treatment of the object in the target space S is not completed, and when the period is long, it is determined that the treatment of the object in the target space S is completed. off and on-time T on By controlling the operation of the ozone supply unit 10 based on the length of the period consisting of the ON time T on Since the off time T hardly changes regardless of the amount of objects present in the response space S, off Therefore, like the ozone generation control device 1B, the ozone generation control device 1C can easily and accurately determine that the treatment of the object in the treatment space S has been completed.

[0116] In addition, the ozone generation control device 1C has an on time T on and off time T off Since the completion of the treatment of the object present in the target space S is determined based on the extent to which the length of the off time T offSince ozone can be generated again based on the extent of the extension of the length, ozone supply unit 10 can start generating ozone at an optimal timing. Therefore, ozone generation control device 1B can reduce the consumption of energy required for generating ozone, similar to ozone generation control device 1A.

[0117] [Fourth embodiment] An ozone generation control device according to a fourth embodiment of the present invention will be described. Fig. 9 is a schematic configuration diagram showing an ozone generation control device according to this embodiment. As shown in Fig. 9, an ozone generation control device 1D according to this embodiment is obtained by changing the control unit 30C of the ozone generation control device 1C according to the above-mentioned third embodiment to a control unit 30D. This embodiment is similar to the ozone generation control device 1C according to the third embodiment except for the configuration of the control unit 30D, so only the configuration of the control unit 30D will be described.

[0118] The control unit 30D controls the control unit 30C to calculate the magnitude of the decrease rate of the ozone concentration value based on the off time T off The ON time T from restarting the operation of the ozone supply unit 10 to stopping the operation is on to the length of the off time T off / On time T on (Hereafter, "Relative OFF Time (T off / T on )" The judgment is made based on )).

[0119] As shown in Figure 2, the on-time T on is time t 11 and time t 10 In both cases, the on-time T on (Time t 11 , time t 10 ) are both off times T off (time t1, time t0). Therefore, the off time T off When judging the difference between off / T on ), the off time T offThe differences can be judged as substantially equivalent.

[0120] The control unit 30D determines the relative ratio of the off times (T off / T on ) is small, it is determined that the processing of the object in the target space S is not completed, and the relative ratio of off time (T off / T on When the ratio of the OFF time (T off / T on If the off-time ratio (T off / T on ) is equal to or greater than a predetermined value, it is determined that processing of the object in the object space S is complete.

[0121] The predetermined value is not particularly limited and is set appropriately depending on the type of object. The predetermined value is, for example, the relative ratio of the off time (T off / T on ).

[0122] An example of an ozone treatment method for removing targets present in the target space S using the ozone generation control device 1D having the above configuration will be described.

[0123] Fig. 10 is a flow chart for explaining the ozone treatment method. As shown in Fig. 10, the control unit 30D controls the operation of the ozone supply unit 10 to treat the target object present in the target space S with ozone (ozone treatment step: step S41). The ozone treatment step (step S41) is similar to the ozone treatment step (step S11) of the ozone treatment method shown in Fig. 3, so details are omitted.

[0124] After the ozone treatment step (step S41), the control unit 30D turns off the OFF time T off and on-time T on (Step S42), and the relative ratio of the off time (T off / T on ) is calculated (step S43).

[0125] Next, the control unit 30D calculates the relative ratio of the calculated OFF times (T off / T on ) is equal to or greater than a predetermined value (step S44).

[0126] In step S44, the relative ratio of the OFF time (T off / T on If the difference is equal to or greater than the predetermined value (step S44: Yes), it is determined that the processing of the object in the treatment space S is completed, and the processing ends.

[0127] In step S44, the relative ratio of the OFF time (T off / T on ) does not reach the predetermined value (step S44: No), it is determined that the treatment of the object in the treatment space S is not complete. Then, the control unit 30D drives the ozone supply unit 10 again to generate ozone, and treats the object present in the treatment space S with the ozone (ozone treatment process: step S41).

[0128] According to the ozone treatment method of this embodiment, like the ozone treatment method of the first embodiment, ozone can be generated and stopped at optimal timing in the treatment space S. Therefore, by using the ozone treatment method of this embodiment, it is possible to maintain the ozone concentration in the target space S at a safe concentration (e.g., 0.08 ppm to 0.1 ppm), decompose the target in the target space S, and suppress the generation of excess ozone in the ozone supply unit 10.

[0129] The ozone generation control device 1D controls the relative ratio of off times (T off / T on When the off time ratio (T off / T on When the ratio (Toff / T on By controlling the operation of the ozone supply unit 10 based on the magnitude of the on-time T, the concentration of the target substance in the treatment space S can be reduced to an allowable concentration or less, and it is possible to easily determine whether or not the treatment of the target substance has been completed. on Since does not change much regardless of the amount of objects present in the response space S, (off time T off / On time T on ) can provide substantially the same results as when it is determined based on the off time. Thus, like the ozone generation control device 1C, the ozone generation control device 1D can easily and accurately determine that the treatment of the object in the treatment space S has been completed.

[0130] [Fifth embodiment] An ozone generation control device according to a fifth embodiment of the present invention will be described. Fig. 11 is a schematic configuration diagram showing an ozone generation control device according to this embodiment. As shown in Fig. 11, an ozone generation control device 1E according to this embodiment is obtained by replacing the control unit 30A of the ozone generation control device 1A according to the above-mentioned first embodiment with a control unit 30E. This embodiment is similar to the ozone generation control device 1A according to the first embodiment except for the configuration of the control unit 30E, so only the configuration of the control unit 30E will be described.

[0131] After the control unit 30A determines that the treatment of the object has been completed, the control unit 30E drives the ozone supply unit 10 for a predetermined time to treat another object (second object) of a different type from the specific object (first object) that is present in the target space S.

[0132] There are often multiple objects to be decomposed in the target space S. The proportion of the objects that are decomposed and removed by ozone varies depending on the type and concentration of the objects. Therefore, even if a specific object is removed, other objects may remain.

[0133] After the control unit 30E determines that the treatment of the target object has been completed, it drives the ozone supply unit 10 for a predetermined time to treat other objects other than the target object that are present in the target space S, and removes the other objects to a concentration below a predetermined standard value.

[0134] The predetermined time is not particularly limited, and may be a time that allows the processing of the other objects to be completed depending on the type, concentration, etc. of the other objects. For example, since ozone is consumed by reacting with other objects in addition to the remaining objects, and new ozone is supplied from the ozone supply unit 10 into the target space S, the ozone concentration per unit time does not tend to fluctuate, but when the concentration of the other objects decreases to a level that does not react with ozone or is almost completely decomposed, the ozone concentration increases rapidly. Therefore, the predetermined time may be the time until the rate of increase in the ozone concentration increases due to the reaction with the other objects.

[0135] An example of an ozone treatment method for removing targets present in the target space S using the ozone generation control device 1E having the above configuration will be described.

[0136] 12 is a flow chart for explaining the ozone treatment method. As shown in FIG. 12, the control unit 30E controls the operation of the ozone supply unit 10 to treat the object present in the target space S with ozone (ozone treatment process: step S51), and then, after an off time T off The rate of decrease in the ozone concentration in the target space S is calculated (step S52), and it is determined whether the calculated rate of decrease in the ozone concentration is equal to or lower than a predetermined rate (step S53). Note that steps S51 to S53 of the ozone treatment method according to this embodiment are similar to steps S11 to S13 of the ozone treatment method of the ozone generation control device 1A according to the first embodiment shown in FIG. 3, and therefore details thereof will be omitted.

[0137] In step S53, the time T offIf the rate at which the ozone concentration is decreasing is equal to or lower than a predetermined rate (step S53: Yes), the control unit 30E drives the ozone supply unit 10 to process objects other than the specified object that are present in the target space S, and removes the other objects to a concentration below a predetermined standard value (step S54).

[0138] In step S54, the control unit 30E may repeat a step similar to the ozone treatment step (step S51) one or more times, or may continue the step for a predetermined period of time.

[0139] Furthermore, in step S54, the control unit 30E may repeat a process similar to the ozone treatment process (step S51) until an integrated value (CT value) of the ozone concentration C in the target space S and the ozone generation time T by the ozone supply unit 10 reaches a predetermined value. In this case, the predetermined value is a CT value required for sterilizing or inactivating other objects, and is appropriately set according to the type of other objects (e.g., types of bacteria, viruses, etc.).

[0140] When the control unit 30E determines that other objects in the treatment space S have been removed to a concentration equal to or lower than a predetermined reference value, the process ends.

[0141] According to the ozone treatment method of this embodiment, even if the ozone concentration is equal to or higher than the stop threshold, in step S24, the ozone supply unit 10 is driven to supply ozone into the target space S. As a result, the concentration of a specific object in the target space S is reduced or the object is completely decomposed and removed. Objects other than the target object that exist in the target space S are decomposed and removed by the ozone supplied from the ozone supply unit 10 to a state where there is almost no ozone consumption, so that the concentration can be reduced to an allowable predetermined value or lower.

[0142] Furthermore, according to the ozone treatment method of this embodiment, like the ozone treatment method of the first embodiment, ozone can be generated at an optimal timing in the treatment space S. Therefore, by using the ozone treatment method of this embodiment, it is possible to maintain the ozone concentration in the target space S at a safe concentration (e.g., 0.08 ppm to 0.1 ppm), decompose a specific object in the target space S and other objects, and suppress generation of excess ozone in the ozone supply unit 10.

[0143] The ozone generation control device 1E drives the ozone supply unit 10 after the control unit 30E determines that the treatment of the object is completed. In this way, the ozone generation control device 1E generates ozone from the ozone supply unit 10, and while more reliably removing the specific object in the target space S, decomposes objects of different types other than the specific object present in the target space S to a state where ozone consumption is almost zero, and reduces the concentration of the objects to an allowable predetermined value or less. Therefore, even if multiple objects of different types are present in the treatment space S, the ozone generation control device 1E can reduce the concentrations of the multiple objects in the treatment space S to a predetermined value or less and determine with high accuracy that the treatment of the multiple objects in the treatment space S is completed.

[0144] As a result, the ozone generation control device 1E can simultaneously determine the completion of processing of different types of targets, for example, when a specific target is an odorous gas, and another target is a virus, and these need to be processed together.

[0145] As described above, the ozone generation control devices 1A to 1E according to the above-mentioned embodiments have the above characteristics, and therefore can accurately determine that removal of the object in the target space S has been completed in an optimal time with a simple configuration without generating more ozone than necessary. Therefore, the ozone generation control devices 1A to 1E can be suitably used as devices for removing the object present in the space and purifying the air by installing them in the rooms of buildings such as houses, buildings, hotels, hospitals, welfare facilities, etc., the interiors of cars, trains, etc., the interiors of airplanes, etc. In particular, the ozone generation control devices 1A to 1E can reduce the time required to treat the object with ozone and the amount of unnecessary ozone generated. Therefore, the object in each room and vehicle interior can be reliably removed while reducing the energy consumption of the building, vehicle, etc. Thus, the ozone generation control devices 1A to 1E can be suitably used for deodorizing, removing organic matter, removing harmful substances, sterilizing, etc. in rooms in buildings, the interiors of vehicles, etc.

[0146] Although the embodiment has been described above, the above embodiment is presented as an example, and the present invention is not limited to the above embodiment. The above embodiment can be implemented in various other forms, and various combinations, omissions, substitutions, modifications, etc. can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0147] 1A, 1B, 1C, 1D, 1E Ozone generation control device 10 Ozone supply unit 20 Ozone detection unit (ozone concentration sensor) 30A, 30B, 30C, 30D, 30E Control section S target space

Claims

1. An ozone supply unit that supplies ozone into the target space; an ozone detection unit that detects ozone in the target space and outputs an ozone concentration value; A control unit that drives and controls the ozone supply unit based on the ozone concentration value; An ozone generation control device comprising: The control unit determines that the treatment of the object in the target space is not complete when the rate of decrease of the ozone concentration value after driving of the ozone supply unit is stopped is large, and determines that the treatment of the object in the target space is complete when the rate of decrease is small.

2. 2. The ozone generation control device according to claim 1, wherein the control unit starts driving the ozone supply unit when the ozone concentration value becomes equal to or lower than a start threshold, and stops driving the ozone supply unit when the ozone concentration value becomes equal to or higher than a stop threshold that is greater than the start threshold.

3. 3. The ozone generation control device according to claim 2, wherein the control unit determines that the treatment of the object is not completed when the off time from when the operation of the ozone supply unit is stopped to when it is restarted is short, and determines that the treatment of the object is completed when the off time is long.

4. 4. The ozone generation control device according to claim 3, wherein the control unit determines that the treatment of the object in the target space is not complete when a cycle consisting of an on-time and an off-time from when the operation of the ozone supply unit is restarted to when it is stopped is short, and determines that the treatment of the object in the target space is complete when the cycle is long.

5. 5. The ozone generation control device according to claim 4, wherein the control unit determines that treatment of the object in the target space is not complete when the ratio of the off time to the on time is small, and determines that treatment of the object in the target space is complete when the ratio of the off time to the on time is large.

6. The ozone generation control device according to any one of claims 1 to 5, wherein the control unit, after determining that the treatment of the object has been completed, drives the ozone supply unit to treat another object.

7. An ozone supply unit that supplies ozone into the target space; an ozone detection unit that detects ozone in the target space and outputs an ozone concentration value; A control unit that drives and controls the ozone supply unit based on the ozone concentration value; An ozone generation control device comprising: The control unit determines that the treatment of the object in the target space has not progressed to a predetermined level when the rate of decrease of the ozone concentration value after the operation of the ozone supply unit is stopped is large, and determines that the treatment of the object in the target space has progressed to a predetermined level when the rate of decrease is small.

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