JP6372743B2 - Aldehyde reduction device for passenger compartment air - Google Patents

Description

  The present invention relates to an aldehyde reducing device for cabin air that reduces the concentration of aldehyde contained in the air in the cabin of a vehicle.

  Japanese Patent Application Laid-Open No. 2000-246040 describes an adsorption processing member used for a vehicle air conditioner. In this air conditioner, a filter attachment portion is formed between the blower and an evaporator provided on the downstream side of the blower, and a sheet-like filter member (adsorption processing member) supported by a frame-like member is the filter attachment portion. Installed on. The filter member is formed by a physical adsorbent and a chemical adsorbent, and the air-adsorbing air passes through the filter member in one direction, whereby an adsorbed component such as aldehyde in the air is adsorbed.

JP 2000-246040 A

  In the case of a general VOC (volatile organic compound), the VOC concentration in the passenger compartment is similarly reduced according to the decrease in the VOC content of the object due to volatilization from the object constituting the passenger compartment. On the other hand, aldehydes are said to be produced by alcohol oxidation or vinyl acetate hydrolysis, and there is a possibility that aldehydes may be produced continuously in the passenger compartment over a long period of time. For this reason, it is necessary to continuously remove the aldehyde in the passenger compartment for a long period of time.

  However, in the apparatus described in Patent Literature 1, since the aldehyde in the air in the passenger compartment is adsorbed and removed using the filter member formed of the adsorbent, the accumulated amount of aldehyde adsorbed on the filter member There is a possibility that the adsorption performance of the filter member will decrease as the value increases. For this reason, in order to continuously reduce the aldehyde in the air in the passenger compartment below a desired concentration, maintenance work such as replacement of the filter member is required, which may increase the maintenance cost of the apparatus.

  Therefore, an object of the present invention is to provide a vehicle interior aldehyde reduction device that can continuously reduce the concentration of aldehyde in the air in the passenger compartment to a desired concentration or less without requiring replacement of a filter or the like.

To achieve the above object, a first aspect of the present invention is an aldehyde reduction device of the passenger compartment air to reduce the concentration of aldehydes contained in the air in the passenger compartment of the vehicle, and aldehyde concentration detection means, humidification means And an aldehyde discharging means and a control means. The aldehyde concentration detection means detects the aldehyde concentration in the air in the passenger compartment. The humidifying means humidifies the passenger compartment, thereby increasing the water vapor in the air that captures the aldehyde vaporized in the passenger compartment. The aldehyde discharging means cools the air in the passenger compartment and discharges the water vapor capturing the aldehyde out of the passenger compartment as condensed water containing aldehyde. The control means determines whether or not the aldehyde concentration detected by the aldehyde concentration detection means has exceeded a predetermined first threshold, and when it is determined that the detected aldehyde concentration has exceeded the first threshold, Let cooling by aldehyde discharge means function. The control means determines that the detected aldehyde concentration has exceeded the first threshold value and causes the humidification means to function, and then the detected aldehyde concentration is lower than a predetermined second threshold value that is lower than the first threshold value. It is determined whether or not it has decreased, and humidification by the humidifying means is continued to function until the detected aldehyde concentration becomes lower than the second threshold value.

  In the above configuration, the aldehyde concentration in the air vaporized in the passenger compartment is detected by the aldehyde concentration detection means, and when the aldehyde concentration exceeds a predetermined threshold, the control means functions as humidification by the humidification means and cooling by the aldehyde discharge means. Let When the humidifying means functions, the passenger compartment is humidified and the amount of water vapor in the air increases. Since the vaporized aldehyde easily dissolves in water, when the amount of water vapor in the air increases, the amount of aldehyde that is dissolved and captured by the water vapor increases. Also, when the aldehyde discharging means functions, the air in the passenger compartment is cooled, and when the temperature of the air falls below the dew point of the water vapor in the air, the water vapor capturing the aldehyde is condensed and discharged out of the passenger compartment as condensed water containing aldehyde. Thus, the aldehyde concentration in the passenger compartment air falls below a predetermined threshold.

  In this way, the aldehyde in the air is supplemented with water vapor increased by humidifying the passenger compartment, and the air is cooled and discharged out of the passenger compartment as condensed water containing aldehyde, so it is continuously generated in the passenger compartment for a long time. The aldehyde concentration can be continuously reduced relative to the aldehyde. For this reason, compared with the case where aldehyde is adsorbed using, for example, a filter, maintenance work such as filter replacement is unnecessary, and the maintenance cost of the apparatus can be reduced.

  In addition, since the aldehyde concentration in the passenger compartment air is detected to determine whether or not a predetermined threshold value has been exceeded, the desired aldehyde concentration in the passenger compartment can be reliably set by setting the desired aldehyde concentration at the predetermined threshold value. It is possible to continuously reduce the concentration to less than that. Further, since the humidification means and the aldehyde discharge means function only when the predetermined threshold value is exceeded, excessive energy consumption of the apparatus can be suppressed. In addition, since the passenger compartment is humidified, it is possible to provide a comfortable passenger compartment space in which the humidity of the passenger compartment air is maintained even in winter when the air is dry.

A second aspect of the present invention is an aldehyde reduction device for passenger compartment air that reduces the concentration of aldehyde contained in the air in the passenger compartment of the vehicle, the aldehyde concentration detecting means, the humidifying means, the aldehyde discharging means, Control means. The aldehyde concentration detection means detects the aldehyde concentration in the air in the passenger compartment. The humidifying means humidifies the passenger compartment, thereby increasing the water vapor in the air that captures the aldehyde vaporized in the passenger compartment. The aldehyde discharging means cools the air in the passenger compartment and discharges the water vapor capturing the aldehyde out of the passenger compartment as condensed water containing aldehyde. The control means determines whether or not the aldehyde concentration detected by the aldehyde concentration detection means exceeds a predetermined threshold, and when it is determined that the detected aldehyde concentration exceeds the predetermined threshold, the humidification by the humidification means and the aldehyde The cooling by the discharging means functions. The humidifying means communicates a tank for storing water in a part of the accommodation space, a casing and a tank, a first communication path having a tank-side tip opening in the water in the tank, a casing and a tank, And a pump for circulating the air in the passenger compartment in the order of the first communication path, the tank, and the second communication path. to have a. Aldehyde emissions means chromatic an evaporator to cool the surrounding air, a blowing fan for blowing air in the passenger compartment around the evaporator, and a discharge passage for discharging the condensed water generated by the cooling of the air outside the vehicle compartment.

  In the above configuration, when the pump of the humidifying means is activated, the air in the passenger compartment circulates in the order of the first communication path, the tank, and the second communication path. Since the tank-side tip of the first communication passage is open in the tank water, air passes through the water as bubbles, and the amount of water vapor in the air increases when the air contacts the water. In addition, since the front end of the first communication path on the tank side is open in the air of the tank, air with an increased amount of water vapor circulates to the passenger compartment and the passenger compartment is humidified. Also, when the blower fan of the aldehyde discharge means is activated, the blower fan blows the air in the passenger compartment to the evaporator, and when the blown air is cooled below the dew point by the evaporator, the water vapor is condensed and condensed water is discharged from the drainage channel. It is discharged outside the passenger compartment.

  By functioning such humidification means and aldehyde discharge means, the amount of water vapor in the passenger compartment air is increased to capture aldehyde in the air, the air that has captured the aldehyde is cooled, and the aldehyde is combined with condensed water. Discharge outside the passenger compartment. For this reason, in order to continuously reduce the aldehyde concentration in the passenger compartment below the desired concentration, it is only necessary to replenish the tank water necessary for humidifying the passenger compartment. For example, a filter or the like is used to adsorb the aldehyde. Compared to the case, maintenance work such as filter replacement is unnecessary, and the maintenance cost of the apparatus can be reduced. In addition, by allowing the passenger compartment air to pass through the water as bubbles, the aldehyde remaining in the passenger compartment air without being trapped by water vapor is dissolved in the water. The concentration can be reduced. In addition, in a vehicle equipped with an air conditioner that adjusts the temperature of the passenger compartment, the evaporator, the blower fan, and the drainage channel of the air conditioner can be used as aldehyde discharge means, which can suppress an increase in equipment costs. It becomes possible.

  According to the present invention, it is possible to continuously reduce the concentration of aldehyde in the air in the passenger compartment to a desired concentration or less without requiring replacement of a filter or the like.

It is a schematic diagram which shows the principal part of a vehicle provided with the aldehyde reduction apparatus of the vehicle interior air concerning this embodiment. It is a flowchart which shows an aldehyde reduction process.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A vehicle 2 equipped with the aldehyde reduction device 1 of the present embodiment is a freight vehicle having a cab 3 and a loading platform (not shown). As shown in FIG. 1, the aldehyde reduction device 1 includes a humidification unit 7, an air conditioning unit 17, a gas sensor 5, and a control unit 31.

  The cab 3 is a substantially box-shaped body, and defines a vehicle compartment 4 that accommodates a vehicle occupant.

  As shown in FIG. 1, the humidifying unit 7 includes a first pipe (first communication path) 8, a pump 12, a second pipe (first communication path) 9, a tank 13, and a bubble generation unit (first ), A third pipe (second communication path) 10, a deodorizing filter 15, a fourth pipe (second communication path) 11, and a water distribution pipe 16. The first pipe line 8 communicates the vehicle compartment 4 and the pump 12, and the second pipe line 9 communicates the pump 12 and the tank 13. The third pipe line 10 communicates the tank 13 and the deodorizing filter 15, and the fourth pipe line 11 communicates the deodorizing filter 15 and the vehicle compartment 4. The tank 13 is a sealed structure having a connection port with the second pipe line 9, the third pipe line 10, and the water distribution pipe line 16, so that the water supplied from the water distribution pipe line 16 is maintained at a predetermined water level. Water is stored in 13. A bubble generating portion 14 is connected to the tip of the second conduit 9 on the tank side and protrudes into the water in parallel with the water surface of the tank 13. The bubble generating part 14 has, for example, a substantially cylindrical shape having one end connected to the tip of the second conduit 9 and the other end sealed, and is formed of a porous member in which the inside of the cylinder communicates with the outside of the cylinder. ing.

  The pump 12 is disposed between the first pipe line 8 and the second pipe line 9, and when the pump 12 is operated, the first pipe line 8, the second pipe line 9, the bubble generating unit 14, and the third pipe line. 10, the air in the passenger compartment 4 circulates in the order of the deodorizing filter 15 and the fourth pipeline 11. When the pump 12 is activated and the air in the passenger compartment 4 is sent into the cylinder of the bubble generating unit 14, the air that has been sent becomes fine bubbles from the cylindrical outer surface of the bubble generating unit 14 and is released into the water of the tank 13. Is done. The deodorizing filter 15 is formed of activated carbon or the like, for example, and adsorbs and removes odor components contained in the air passing through the deodorizing filter 15. In addition, installation of the deodorizing filter 15 and the 4th pipe line may be abbreviate | omitted, and the tank 13 and the vehicle interior 4 may be connected by the 3rd pipe line.

  The air conditioning unit 17 includes a case 18, a blower fan 19, an evaporator 20, a flow path partition member 21, an air mix damper 22, a heater core 23, and a condensed water discharge path 24. The air conditioning unit 17 has an air conditioning control unit (not shown) that controls the air conditioning unit 17 and adjusts the room temperature of the passenger compartment 4. A desired passenger compartment temperature is variably set in the air conditioning control unit. . The case 18 is a hollow substantially box-shaped member, and an inner peripheral surface defines an air flow path 25. The case 18 is formed with a unit inlet 26 and a unit outlet 27 that communicate the outside of the case 18 with the flow path 25. The unit inlet 26 and the unit outlet 27 communicate with the interior of the passenger compartment 4 via an air conditioning duct (not shown).

  The blower fan 19 is provided in the vicinity of the unit inlet 26 of the flow path 25. The blower fan 19 is driven by a motor to cause the air in the passenger compartment 4 to flow from the unit inlet 26 into the flow path 25 and to flow toward the unit outlet 27. The evaporator 20 is provided on the downstream side of the blower fan 19 in the flow path 25 so as to be orthogonal to the flow direction. The evaporator 20 has a tube through which refrigerant (air conditioner gas) flows, and cools the air passing through the evaporator 20. The motor of the blower fan 19 is driven not only by the air conditioning control unit but also by the control unit 31 of the aldehyde reduction device 1.

  The flow path partition member 21 is a plate-like member, and is provided on the downstream side of the evaporator 20 in the flow path 25 along the air flow direction. The flow path 25 is partitioned into a heating flow path 28 and a passage flow path 29. To do. The air mix damper 22 is rotatably supported at the upstream end of the flow path partition member 21. The air mix damper 22 is driven by a motor and adjusts the amount of air flowing into the heating flow path 28 and the passage flow path 29 by changing the set position.

  The heater core 23 is provided in the heating channel 28 perpendicular to the air flow direction. The heater core 23 has a tube through which cooling water that has cooled the engine flows, and heats the air passing through the heater core 23. Further, on the downstream side of the flow path partition member 21 and in the vicinity of the unit outlet 27 at the downstream end of the flow path 25, the air flowing through the heating flow path 28 and the air flowing through the passage flow path 29 are merged. A chamber portion 30 is provided.

  In the air conditioning unit 17 configured as described above, when the air conditioning switch (not shown) provided in the air conditioning control unit is set to ON, the air conditioning control unit operates the blower fan 19. When the blower fan 19 is activated, the air in the passenger compartment 4 flows into the flow path 25 from the unit inlet 26 and is cooled by passing through the evaporator 20. The cooled air (cold air) flows into the heating flow path 28 and the passage flow path 29 in accordance with the set position of the air mix damper 22. The cold air that has flowed into the heating channel 28 is heated by passing through the heater core 23. The air (warm air) heated through the heating flow path 28 and the cold air flowing through the passage flow path 29 merge and mix in the chamber portion 30 and flow out from the unit outlet 27 as conditioned air. The air conditioning control unit changes the setting position of the air mix damper 22 so that the temperature of the conditioned air flowing out from the unit outlet 27 becomes the passenger compartment temperature set in the air conditioning control unit and the flow through the heating flow path 28. The amount of air flowing into the passage 29 is adjusted.

  Further, when the air flowing into the flow path 25 is cooled below the dew point temperature by the evaporator 20, the water vapor in the air is condensed and discharged as condensed water to the outside of the vehicle compartment 4 via the condensed water discharge path 24.

  The gas sensor 5 is installed in the passenger compartment 4, detects the aldehyde concentration Qr in the air in the passenger compartment 4, and outputs the detection result to the ECU 6. The gas sensor 5 is formed using, for example, a semiconductor gas detection element.

  The ECU 6 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The CPU reads the aldehyde reduction processing program stored in the ROM, executes the processing, and functions as the control unit 31. The RAM stores the aldehyde concentration Qr output from the gas sensor 5. The RAM also functions as a setting area for the first threshold value Qh1 and the second threshold value Qh2 for the preset aldehyde concentration, and a temporary storage area for CPU calculation results.

  The control unit 31 acquires the aldehyde concentration Qr of the air in the passenger compartment 4 output from the gas sensor 5 and compares it with the first threshold value Qh1 (predetermined threshold value) and the second threshold value Qh2 of the aldehyde concentration. When the aldehyde concentration Qr is larger than the first threshold value Qh1, the pump 12 of the humidifying unit 7 and the blower fan 19 of the air conditioning unit 17 are operated. When the aldehyde concentration Qr is equal to or less than the second threshold value Qh2, the pump 12 of the humidifying unit 7 and the blower fan 19 of the air conditioning unit 17 are stopped. That is, the control unit 31 functions as a control unit. The second threshold value Qh2 of the aldehyde concentration is provided in order to suppress frequent operations of the humidifying unit 7 and the air conditioning unit 17 by the control unit 31 when the aldehyde concentration Qr is in the vicinity of the first threshold value Qh1. Is set in the vicinity of the first threshold value Qh1 and smaller than the first threshold value Qh1.

  Next, the aldehyde reduction process will be described based on the flowchart shown in FIG. This process is repeatedly executed every predetermined time in a state where the engine key of the vehicle 2 is ON, for example. The ECU 6 first acquires the aldehyde concentration Qr detected by the gas sensor 5 (step S1). Next, the aldehyde concentration Qr is compared with the first threshold value Qh1 of the aldehyde concentration. When the aldehyde concentration Qr is larger than the first threshold value Qh1, the process proceeds to step S3 (step S2). In step S <b> 3, the ECU 6 operates the pump 12 of the humidifying unit 7 to circulate the air in the passenger compartment 4 through the water in the tank 13. Next, the ECU 6 proceeds to step S4, and determines whether or not the air conditioning switch of the air conditioning control unit is ON. When the air conditioning switch is OFF, the process proceeds to step S5, the blower fan 19 of the air conditioning unit 17 is operated, and the air in the passenger compartment 4 is blown to the evaporator 20 of the air conditioning unit 17. When the air conditioning switch is ON, the air conditioning unit 17 is operated by the air conditioning control unit, and the blower fan 19 has already been operated, so the processing is terminated.

  In step S2, when the aldehyde concentration Qr is not more than the first threshold value Qh1, the process proceeds to step S6. In step S6, the aldehyde concentration Qr is compared with the second threshold value Qh2 of the aldehyde concentration. If the aldehyde concentration Qr is equal to or less than the second threshold value Qh2, the process proceeds to step S7. In step S <b> 7, the ECU 6 stops the pump 12 of the humidifying unit 7 and stops the circulation of air in the passenger compartment 4. Next, the ECU 6 proceeds to step S8 and determines whether or not the air conditioning switch is ON. When the air conditioning switch is OFF, the process proceeds to step S9, the blower fan 19 is stopped, and the blowing of air from the passenger compartment 4 to the evaporator 20 is stopped. When the air conditioning switch is ON, the air conditioning unit 17 is operating by the air conditioning control unit, and thus the process is terminated without stopping the blower fan 19.

  In step S6, when the aldehyde concentration Qr is larger than the second threshold value Qh2, that is, when the aldehyde concentration Qr is equal to or less than the first threshold value Qh1 and the aldehyde concentration Qr is larger than the second threshold value Qh2, the process is terminated and humidification is performed. The current operating state or stopped state of the unit 7 and the air conditioning unit 17 is continued.

  In the present embodiment, when the aldehyde concentration Qr vaporized in the passenger compartment 4 is detected by the gas sensor 5 and the aldehyde concentration Qr exceeds the first threshold value Qh1, the controller 31 causes the pump 12 of the humidification unit 7 and the blower fan of the air conditioning unit 17 to 19 is activated.

  When the pump 12 of the humidifying unit 7 is activated, the air in the passenger compartment 4 flows into the bubble generating part 14 via the first conduit 8 and the second conduit 9, and passes through the water as fine bubbles. It circulates through the third pipeline, the deodorizing filter 15 and the fourth pipeline 11 to the passenger compartment. When the air passes through the water as bubbles, the water and the water come into contact with each other, the amount of water vapor in the air increases, and the increased amount of water vapor circulates to the vehicle interior 4 to humidify the vehicle interior 4. The Since the vaporized aldehyde is easily dissolved in water, the aldehyde in the air in the passenger compartment 4 is captured by water vapor in the air in the passenger compartment 4, but when the amount of water vapor increases, the amount of aldehyde dissolved and captured in the water vapor Will also increase.

  Further, when the blower fan 19 of the air conditioning unit 17 is activated, the air in the passenger compartment 4 with the increased amount of water vapor is blown to the evaporator 20 of the air conditioning unit 17. When the blown air is cooled below the dew point by the evaporator 2, the water vapor in the air is condensed, and the aldehyde trapped in the water vapor is discharged out of the passenger compartment 4 from the condensed water discharge passage 24 of the air conditioning unit 17 as condensed water. Is done. As a result, the concentration of the aldehyde in the air in the passenger compartment 4 decreases to the first threshold value Qh1 or less.

  As described above, the aldehyde in the air is supplemented by the water vapor increased by humidifying the passenger compartment 4, and the condensed water containing the aldehyde is discharged outside the passenger compartment by cooling the air. The aldehyde concentration can be continuously reduced relative to the aldehyde produced. Further, in order to continuously reduce the aldehyde concentration in the passenger compartment 4, it is only necessary to replenish the water in the tank 13 necessary for humidifying the passenger compartment 4, for example, compared with the case where aldehyde is adsorbed using a filter or the like, Maintenance work such as filter replacement is unnecessary, and the maintenance cost of the apparatus can be reduced.

  Further, since the aldehyde concentration Qr of the air in the passenger compartment 4 is detected to determine whether or not the first threshold value Qh1 is exceeded, the aldehyde in the passenger compartment 4 is set by setting a desired aldehyde concentration in the first threshold value Qh1. It is possible to reliably reduce the concentration Qr continuously below the desired concentration.

  Further, since the pump 12 of the humidifying unit 7 and the blower fan 19 of the air conditioning unit 17 are operated only when the first threshold value Qh1 is exceeded, excessive energy consumption of the apparatus can be suppressed. Further, since the passenger compartment 4 is humidified, it is possible to provide a comfortable passenger compartment space in which the humidity of the air in the passenger compartment 4 is maintained even in winter when the air is dry.

  Further, since the air in the passenger compartment 4 is passed through the water in the tank 13 as bubbles, the aldehyde remaining in the air in the passenger compartment 4 without being trapped by the water vapor is dissolved in the water in the tank 13, and thus more efficient. The aldehyde concentration Qr in the air in the passenger compartment 4 can be reduced well. In addition, since the blower fan 19, the evaporator 20, and the condensed water discharge passage 24 of the air conditioning unit 17 that adjusts the temperature of the passenger compartment 4 are used as part of the components of the aldehyde reduction device 1, an increase in device cost is suppressed. It becomes possible.

  The humidification of the vehicle compartment 4 is not limited to the humidification unit 7 of the present embodiment as long as it increases the amount of water vapor in the air. For example, the water is atomized and sprayed into the air of the vehicle compartment 4 for humidification. It may be a thing to do.

  Further, the cooling of the air in the passenger compartment 4 is not limited to the one using the air conditioning unit 17 of the vehicle 1 of the present embodiment, for example, a cooling device formed by a Peltier element is separately provided and cooled. Also good.

  Further, the aldehyde reducing device of the present embodiment is not limited to reducing the concentration of aldehyde contained in the air in the passenger compartment 4, and is also applicable to reducing the concentration of a water-soluble VOC (volatile organic compound) such as methanol. Is possible.

  Moreover, although the control part 31 used 1st threshold value Qh1 and 2nd threshold value Qh2 in order to reduce the aldehyde density | concentration Qr of the compartment 4, you may use only 1st threshold value Qh1 (predetermined threshold value). In this case, the control unit operates the humidification unit 7 and the air conditioning unit 17 when the aldehyde concentration Qr exceeds the first threshold value Qh1, and the humidification unit 7 and the air conditioning unit when the aldehyde concentration Qr becomes equal to or less than the first threshold value Qh1. The operation of 17 is stopped.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  The present invention is widely applicable as an aldehyde reduction device for vehicle cabin air.

DESCRIPTION OF SYMBOLS 1 Aldehyde reduction apparatus 2 Vehicle 4 Car compartment 5 Gas sensor (aldehyde concentration detection means)
6 ECU
7 Humidification unit (humidification means)
8 1st pipe line (1st communication path)
9 Second pipe (first communication path)
10 3rd pipe line (2nd communication path)
11 Fourth pipeline (second communication path)
12 Pump 13 Tank 14 Bubble generating part (first communication path)
17 Air conditioning unit (aldehyde discharge means)
19 Blower fan 20 Evaporator 24 Condensate discharge path (discharge path)
31 Control part (control means)

Claims (2)

An aldehyde reduction device for passenger compartment air that reduces the concentration of aldehyde contained in the passenger compartment air of a vehicle,
Aldehyde concentration detection means for detecting the aldehyde concentration in the air of the passenger compartment;
Humidification means for increasing water vapor in the air capturing aldehyde vaporized in the passenger compartment by humidifying the passenger compartment;
Aldehyde discharging means for discharging water vapor capturing the aldehyde as condensed water containing aldehyde to the outside of the passenger compartment by cooling the air in the passenger compartment;
It is determined whether or not the aldehyde concentration detected by the aldehyde concentration detection means exceeds a predetermined first threshold, and when it is determined that the detected aldehyde concentration exceeds the first threshold, humidification by the humidification means Control means for functioning cooling by the aldehyde discharge means ,
The control means determines that the detected aldehyde concentration has exceeded the first threshold value and causes humidification by the humidifying means to function, and then the detected aldehyde concentration is lower than the first threshold value. It is determined whether or not the vehicle has fallen below a predetermined second threshold value, and the humidification by the humidifying means is continuously performed until the detected aldehyde concentration becomes lower than the second threshold value. Aldehyde reduction device. An aldehyde reduction device for passenger compartment air that reduces the concentration of aldehyde contained in the passenger compartment air of a vehicle,
Aldehyde concentration detection means for detecting the aldehyde concentration in the air of the passenger compartment;
Humidification means for increasing water vapor in the air capturing aldehyde vaporized in the passenger compartment by humidifying the passenger compartment;
Aldehyde discharging means for discharging water vapor capturing the aldehyde as condensed water containing aldehyde to the outside of the passenger compartment by cooling the air in the passenger compartment;
It is determined whether the aldehyde concentration detected by the aldehyde concentration detection means exceeds a predetermined threshold, and when it is determined that the detected aldehyde concentration exceeds the predetermined threshold, humidification by the humidification means and the aldehyde Control means for functioning cooling by the discharge means,
The humidifying means communicates a tank that stores water in a part of a storage space, the vehicle compartment and the tank, and a first communication path in which a tip on the tank side opens in water in the tank; A second communication path that communicates between the vehicle compartment and the tank, and the front end of the tank opens in the air in the tank; the first communication path; the tank; and the second communication path A pump that circulates the air in the passenger compartment in this order, the aldehyde discharging means, an evaporator that cools the surrounding air, a blower fan that blows the air in the passenger compartment around the evaporator, and the A discharge path for discharging condensed water generated by cooling the air to the outside of the passenger compartment,
An aldehyde reduction device for passenger compartment air characterized by the above.

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