JP2009241892A - Cabin air control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cabin air control device prematurely coping with the abnormal rise of the concentration of carbon dioxide in a cabin by quickly determining the state of that rise if there is possibility of abnormal rising of the concentration of carbon dioxide due to the leakage of refrigerant from the refrigerating cycle of a vehicle air conditioner. <P>SOLUTION: The concentration of carbon dioxide in the cabin 12 is detected by a concentration sensor 38. When the detected concentration of carbon dioxide exceeds a specified value, a predetermined vehicle device is operated to ventilate the inside of the cabin 12 or provide a warning for the ventilation. The rate of rising of the concentration of carbon dioxide in the cabin 12 is determined according to the concentration of carbon dioxide detected by the concentration sensor 38. When the determined rate of rising is higher than a specified level, such forced ventilation as the opening of a window 39 and the execution of the outside air introduction mode of the vehicle air conditioner 14 are performed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle interior air management device capable of managing the carbon dioxide concentration in a vehicle interior of a vehicle such as a passenger car, and more particularly to a vehicle interior air management device including a vehicle air conditioner using carbon dioxide as a refrigerant in a refrigeration cycle. Is.

Conventionally, as this kind of vehicle interior air management device, for example, configurations as disclosed in Patent Literature 1 and Patent Literature 2 have been proposed.
In the conventional configuration described in Patent Document 1, a concentration sensor for detecting the carbon dioxide concentration in the passenger compartment is provided. When the detection result of the concentration sensor reaches a level that causes discomfort to the human body, the air conditioner is set to the outside air introduction mode or the inside / outside air introduction mode so that the discomfort is eliminated. On the other hand, if the detection result of the concentration sensor reaches a level that poses a danger to the human body due to gas leakage of refrigerant (carbon dioxide) from the refrigeration cycle of the air conditioner, the air conditioner is introduced into the outside air The mode is set, the window glass is opened, and an alarm is sounded to avoid danger.

Further, in the conventional configuration described in Patent Document 2, a detection device for detecting the carbon dioxide concentration is provided in a position on the downstream side of the location of the evaporator in the refrigeration cycle in the casing of the air conditioner. And, when the refrigerant gas leaks from the vicinity of the evaporator and the carbon dioxide concentration in the casing becomes high, based on the detection operation of the detection device, the state is notified by the alarm device and the display device, Or the damper of the blower outlet of a casing is closed, and the blowing-out of the air to a vehicle interior is interrupted.
JP 2000-71752 A JP 2000-355213 A

  By the way, when the refrigerant | coolant which consists of carbon dioxide leaks from the refrigerating cycle of an air-conditioning apparatus as mentioned above, and the carbon dioxide penetrate | invades into a vehicle interior, the quantity of the carbon dioxide is more than the quantity discharged | emitted from a human body's respiration. In many cases, the amount of carbon dioxide increases rapidly in a short time. For this reason, it is necessary to take prompt measures such as ventilation in the passenger compartment. In this case, in each of the conventional devices described above, the carbon dioxide concentration in the passenger compartment is measured based only on the detection of the carbon dioxide concentration by the concentration sensor, and the ventilation operation and the alarm operation are executed based on the result. However, since the detection of the carbon dioxide concentration by the concentration sensor is a result detection, the carbon dioxide concentration in the passenger compartment has reached a high level at the time of detection, and the detection operation of the normal concentration sensor is the actual carbon dioxide concentration. There is a certain delay with respect to the density change. Therefore, in these conventional apparatuses, there is a problem that a delay occurs in the detection of the abnormal increase in the carbon dioxide concentration, and it is difficult to respond quickly.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to quickly determine the state of the carbon dioxide concentration in the passenger compartment due to a refrigerant gas leak from the refrigeration cycle of the vehicle air conditioner and quickly deal with it. An object of the present invention is to provide a vehicle interior air management device.

  To achieve the above object, the present invention operates a carbon dioxide concentration sensor for detecting a carbon dioxide concentration in a passenger compartment and a predetermined vehicle device when the detected carbon dioxide concentration exceeds a specified value. In the vehicle interior air management device comprising the actuating means, the determination means for determining the degree of increase in the carbon dioxide concentration in the vehicle interior, and the degree of increase determined by the determination means is steeper than a specified level. In this case, a control means for performing forced ventilation is provided.

  Therefore, during normal operation of the vehicle, the concentration sensor detects the carbon dioxide concentration in the vehicle interior, and when the detected value of the carbon dioxide concentration exceeds a specified value, a predetermined vehicle device is operated, Measures such as ventilation operation and notification operation are performed. Further, when the carbon dioxide concentration is detected by the concentration sensor, the rate of increase of the carbon dioxide concentration in the passenger compartment is determined based on the detection of the carbon dioxide concentration. When the determined increase rate of the carbon dioxide concentration is steeper than the specified level, forced ventilation is performed in the passenger compartment. Therefore, when there is a possibility that the concentration of carbon dioxide in the passenger compartment will rise abnormally due to refrigerant gas leakage from the refrigeration cycle of the vehicle air conditioner, it can be quickly determined without delay and Can be treated.

  Moreover, in the said structure, it is good to comprise so that opening of a window and the external air introduction mode of a vehicle air conditioner may be performed as said forced ventilation. In such a configuration, the vehicle interior can be ventilated in a short time by executing both the opening of the window and the outside air introduction mode of the vehicle air conditioner.

  Furthermore, in the said structure, when the carbon dioxide concentration in the said vehicle interior falls from the said prescribed value, the said control means is good to comprise so that it may maintain an external air introduction mode while closing a window. In such a configuration, after the carbon dioxide concentration in the passenger compartment decreases below the specified value due to forced ventilation, even if the refrigerant gas leakage from the refrigeration cycle continues, the outside air introduction mode is maintained. The possibility that the carbon dioxide concentration in the passenger compartment increases abnormally can be suppressed.

  Further, in the above configuration, the control means may be configured to maintain the outside air introduction mode until the engine is stopped. Here, the maintenance of the outside air introduction mode means that when the air conditioner is operated to stop or enter the inside air circulation mode, the outside air introduction mode is maintained ignoring it. In such a configuration, the effect of suppressing the abnormal increase in the carbon dioxide concentration is continued until the engine is stopped.

  Further, in the above configuration, when the engine restarts after the forced ventilation, the control means opens a window when the concentration sensor detects a carbon dioxide concentration equal to or higher than a second specified value lower than the specified value. It may be configured to be opened. In such a configuration, even when the carbon dioxide concentration in the passenger compartment increases due to refrigerant gas leakage from the refrigeration cycle while the engine is stopped, the ventilation treatment is immediately performed when the engine is restarted. It can be performed.

  Furthermore, in the above-described configuration, a detection unit that detects a gas leak from the refrigeration cycle of the vehicle air conditioner is provided, and the control unit has a rate of increase in the carbon dioxide concentration when the gas leak is detected by the detection unit. It may be configured to perform the forced ventilation when steep, and to block the introduction of outside air into the passenger compartment when the rate of increase in carbon dioxide concentration is not steep.

  In this case, when a refrigerant gas leak occurs in the refrigeration cycle of the vehicle air conditioner, the gas leak state is detected by the detecting means. And when the carbon dioxide of the leaked refrigerant enters the passenger compartment and the carbon dioxide concentration in the passenger compartment may rise abnormally, the rate of increase in the carbon dioxide concentration is steep, Forced ventilation is performed. Therefore, it is possible to accurately determine the abnormal state of the air in the passenger compartment caused by the refrigerant gas leak, and take immediate action. On the other hand, when the carbon dioxide of the refrigerant leaked from the refrigeration cycle does not enter the passenger compartment and is released outside the passenger compartment, the rate of increase in the carbon dioxide concentration in the passenger compartment is not steep. Thus, the introduction of outside air into the passenger compartment is blocked. Therefore, it is possible to prevent the carbon dioxide released outside the passenger compartment from being taken into the passenger compartment.

  As described above, according to the present invention, when there is a possibility that the concentration of carbon dioxide in the passenger compartment may abnormally increase due to refrigerant gas leakage from the refrigeration cycle of the vehicle air conditioner, the state is quickly determined. The effect is that it can be dealt with immediately.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, an air conditioning duct 15 of a vehicle air conditioning (air conditioning) device 14 is disposed in front of an instrument panel 13 in a passenger compartment 12 of the vehicle 11. An inside air introduction port 16 and an outside air introduction port 17 are provided at the air introduction side end of the air conditioning duct 15. Between the inside air introduction port 16 and the outside air introduction port 17, switching between the inside air and the outside air of the introduced air and introduction for adjusting the mix ratio of the inside air and the outside air of the introduced air are performed. The opening damper 18 is disposed and is rotated to a required position by the introduction opening damper actuator 19. On the downstream side of the inside air introduction port 16 and the outside air introduction port 17, a blower 20 is disposed in the air conditioning duct 15 and is rotated by a blower motor 21.

  As shown in FIG. 1, an evaporator (evaporator) 22 of a refrigeration cycle 23 is disposed in the air conditioning duct 15 on the downstream side of the blower 20. A pipe 24 of the refrigeration cycle 23 is provided with a compressor 25 that compresses the refrigerant, a condenser (condenser) 26 that cools the refrigerant by exchanging heat with the outside air, and the compressed refrigerant from the condenser 26 is decompressed and expanded. The expansion valve device 27 and the like are connected to each other. In this embodiment, carbon dioxide is used as the refrigerant. Then, when the compressor 25 is driven by a drive source including an engine or a motor (not shown), the refrigerant is compressed and guided to the evaporator 22 via the condenser 26 and the expansion valve device 27, and is rapidly expanded in the evaporator 22. Thus, the air to be conditioned flowing in the air conditioning duct 15 is cooled.

  As shown in FIG. 1, on the downstream side of the evaporator 22, a heater 28 using engine cooling water as a heat source is disposed in the air conditioning duct 15. A downstream air mix damper 29 for adjusting the ratio of the air passing through the heater 28 and the air bypassing the heater 28 is rotatably disposed in the air conditioning duct 15 on the upstream side of the heater 28. . The downstream air mix damper 29 is pivotally adjusted by a downstream air mix damper actuator 30.

  As shown in FIG. 1, at the outlet side end of the air conditioning duct 15, there are a side outlet 31, a central outlet 32, and a central part outlet 32 that open into the vehicle compartment 12 on both the upper surface, front surface, and lower surface of the instrument panel 13. A lower outlet 33 is provided. Air outlet dampers 34 and 35 are disposed at these air outlets 31 to 33 so as to be capable of opening and closing, and are opened and closed by an air outlet damper actuator 36.

  As shown in FIG. 1, a carbon dioxide concentration sensor (hereinafter simply referred to as a concentration sensor) 38 for detecting the carbon dioxide concentration in the passenger compartment 12 is disposed in the passenger compartment 12 below the seat 37. Yes. When the vehicle 11 is operated or the ignition switch is turned on, the concentration sensor 38 detects the carbon dioxide concentration in the passenger compartment 12, and the detection result is output to the control device 44 shown in FIG. . A window opening / closing actuator 40 made of a motor for opening and closing the window 39 is provided in the vicinity of the window 39 in the door of the vehicle 11. Note that the installation position of the concentration sensor 38 is not limited to the lower part of the seat 37, and may be another position such as an overhead console.

  As shown in FIG. 1, an operation unit 41 for setting or switching the operation mode of the vehicle air conditioner 14 is provided on the front surface of the instrument panel 13. Also, boarding the front of the instrument panel 13 when the carbon dioxide concentration in the passenger compartment 12 exceeds a specified value and when the rate of increase (increase) in the carbon dioxide concentration becomes steeper than the specified level. An alarm device 42 including a buzzer and a lamp for issuing a warning to the person is provided.

Next, a circuit configuration for controlling the vehicle interior air management device having the above-described configuration will be described.
As shown in FIG. 2, the control device 44 constitutes an operation means, a determination means, and a control means, and operates the entire vehicle interior air management device including the vehicle air conditioner 14 in accordance with a program stored in the storage unit 45. The air condition in the passenger compartment 12 is managed. The storage unit 45 stores data necessary for execution of the program, such as a prescribed value of the carbon dioxide concentration in the passenger compartment 12 and a prescribed level of the increase rate of the carbon dioxide concentration in the passenger compartment 12. .

  The prescribed value of the carbon dioxide concentration in the storage unit 45 includes a first prescribed value for use in comparison with a detected value of the carbon dioxide concentration during normal operation of the vehicle 11, and a carbon dioxide concentration at the time of restart after the engine is stopped. And a second specified value for use in comparison with the detected value. In this case, for example, the first specified value of the carbon dioxide concentration is 0.5%, the second specified value is 0.3 to 0.4% lower than the first specified value, and the specified level of the increase rate of the carbon dioxide concentration is The rate of increase is set at 0.1 percent per minute. These values are not limited to the above numerical values, and are set as appropriate.

  The control device 44 receives a detection signal from the concentration sensor 38 and an operation signal from the operation unit 41. From the control device 44, the inlet damper actuator 19, the downstream air mix damper actuator 30, the blowout damper actuator 36, the blower motor 21, the window opening / closing actuator 40 and the alarm device 42 are provided. A drive or stop signal is output.

  When the control device 44 inputs the detection result of the carbon dioxide concentration in the passenger compartment 12 from the concentration sensor 38 during the operation of the vehicle 11, the detection result is stored in the storage unit 45. Compare with Accordingly, when the detection result of the carbon dioxide concentration exceeds the first specified value, the window 39 is opened by the operation of the window opening / closing actuator 40 and the outside air introduction mode is set by the operation of the inlet damper actuator 19. Then, the inside of the passenger compartment 12 is ventilated. At the same time, the alarm device 42 is operated to warn the passenger.

  Further, when the control device 44 inputs the detection result of the carbon dioxide concentration in the passenger compartment 12 from the concentration sensor 38 during operation of the vehicle 11, the increase rate (increase rate) of the carbon dioxide concentration in the passenger compartment 12. And the result of the determination is compared with the prescribed level stored in the storage unit 45. Therefore, when it is determined that the rate of increase in the carbon dioxide concentration is steeper than the specified level, the window 39 is opened by the operation of the window opening / closing actuator 40 and the outside air is introduced by the operation of the inlet damper actuator 19. A mode is set and forced ventilation in the passenger compartment 12 is performed. At the same time, the alarm device 42 is operated to warn the passenger.

  Further, the control device 44 closes the window 39 by the operation of the window opening / closing actuator 40 when the rate of increase of the carbon dioxide concentration in the passenger compartment 12 falls below a specified level due to forced ventilation, and the air conditioner Regardless of the operation such as 14 stop, the outside air introduction mode is maintained until the subsequent engine stop. That is, even when the air conditioner 14 is subsequently stopped by the operation unit 41 or switched to the inside air circulation mode, the outside air introduction mode is maintained until the engine is stopped. In addition, when the carbon dioxide concentration equal to or higher than the second specified value, which is lower than the first specified value, is detected by the concentration sensor 38 during the restart after the engine is stopped, the control device 44 of the window opening / closing actuator 40 The window 39 is opened by the operation.

Next, the operation of the vehicle interior air management apparatus configured as described above will be described.
Now, when the vehicle 11 is in operation and the ignition switch is turned on, the operations shown in the steps of the flowchart of FIG. 3 (hereinafter simply referred to as S) are sequentially executed based on the control of the control device 44. In this flowchart, the program stored in the storage unit 45 is executed by interruption (for example, every second) under the control of the control device 44.

  That is, in S1, it is determined whether or not the carbon dioxide concentration in the passenger compartment 12 detected by the concentration sensor 38 exceeds a first specified value (for example, 0.5 percent) stored in the storage unit 45. The When the detected concentration exceeds the first specified value, the window 39 is opened by the operation of the window opening / closing actuator 40 and the outside air introduction mode is set by the operation of the inlet damper actuator 19 in the next S2. Thus, the inside of the passenger compartment 12 is ventilated. At the same time, the alarm device 42 is operated to warn the passenger by sound or light. In this case, the window 39 does not need to be fully opened, and an opening degree of half or less is sufficient. The reason why the carbon dioxide concentration in the passenger compartment 12 exceeds 0.5 percent is that the passenger compartment 12 is kept in a sealed state and the multi-person ride is continued for a long time with the air conditioner set to the inside air circulation mode. In some cases, carbon dioxide as a refrigerant leaks from the refrigeration cycle 23 into the passenger compartment 12.

  Subsequently, in S3, it is determined whether or not the concentration detected by the concentration sensor 38 has decreased below the first specified value due to ventilation. Until the detected concentration falls below the first specified value, the process returns to S2, and ventilation in the passenger compartment 12 and opening of the window 39 are continued. When the detected concentration falls below the first specified value, the window 39 is closed by the operation of the window opening / closing actuator 40 and the outside air introduction mode is canceled by the operation of the inlet damper actuator 19 in the next S4. Then, the operation of the program ends. Therefore, even in the case of a long ride for many people in a sealed state, the carbon dioxide concentration in the passenger compartment 12 can be maintained at a low level, and a comfortable ride can be obtained.

  On the other hand, if the carbon dioxide concentration in the passenger compartment 12 detected by the concentration sensor 38 does not exceed the first specified value in the determination in S1, the rate of increase in the detected concentration is determined in the next S5, It is compared whether or not the determination result is steeper than the specified level stored in the storage unit 45. When the determination result of the increase rate is not steeper than the specified level, the process returns to S1 and the operations of S1 to S5 described above are repeatedly executed.

  On the other hand, in the determination of S5, when the determination result of the increase rate of the carbon dioxide concentration is steeper than the specified level, the window 39 is opened by the operation of the window opening / closing actuator 40 in the next S6. In addition, the outside air introduction mode is set by the operation of the inlet damper actuator 19, and the forced ventilation in the passenger compartment 12 is performed. At the same time, the alarm device 42 is operated to warn the passenger by sound or light. The reason why the increase rate of the carbon dioxide concentration becomes steeper than the specified level is that carbon dioxide leaks from the refrigeration cycle 23 and enters the vehicle compartment 12.

  Next, in S7, it is determined whether or not the carbon dioxide concentration has decreased below the first specified value due to forced ventilation. Until the carbon dioxide concentration falls below the first specified value, the process returns to S6 and the forced ventilation in the passenger compartment 12 is continued. When the carbon dioxide concentration falls below the first predetermined value, in the next S8, the window 39 is closed by the operation of the window opening / closing actuator 40, and the setting state of the outside air introduction mode remains until the engine stops thereafter. Maintained. In the outside air introduction mode, the blower 20 is continuously rotated and the introduction of outside air is forcibly continued regardless of the operation for the air conditioner 14 and the operation for the inside air circulation mode.

  Furthermore, in S9, the carbon dioxide concentration in the passenger compartment 12 detected by the concentration sensor 38 at the time of restart after the engine stop following the forced ventilation is greater than the first specified value stored in the storage unit 45. It is determined whether or not a low second specified value is exceeded. If the detected concentration does not exceed the second specified value, the program operation ends. On the other hand, when the detected concentration exceeds the second specified value, the window 39 is opened by the operation of the window opening / closing actuator 40 and the alarm device 42 is operated as a warning in the next S10. That is, when the detected concentration exceeds the second specified value, it is considered that leakage of carbon dioxide from the refrigeration cycle 23 continues.

Therefore, the first embodiment has the following effects.
(1) During operation of the vehicle 11, the rate of increase of the carbon dioxide concentration in the passenger compartment 12 is determined based on the detected value of the carbon dioxide concentration in the passenger compartment 12 by the concentration sensor 38, and the determined increase rate is When it is steeper than the specified level, forced ventilation in the passenger compartment 12 is performed by opening the window 39 and executing the outside air introduction mode. Therefore, when there is a possibility that the concentration of carbon dioxide in the passenger compartment 12 may rise abnormally due to the leakage of refrigerant gas from the refrigeration cycle of the vehicle air conditioner 14, the state is quickly determined without causing a delay. Can be dealt with as soon as possible.

  (2) When the concentration of carbon dioxide in the passenger compartment 12 falls below the first specified value due to forced ventilation, the window 39 is closed and the outside air introduction mode is forcibly maintained until the engine stops thereafter. The Therefore, it is possible to suppress the possibility that the carbon dioxide concentration in the passenger compartment 12 abnormally rises again due to the refrigerant gas leakage from the refrigeration cycle.

  (3) The window 39 is opened when the concentration sensor 38 detects a carbon dioxide concentration equal to or higher than the second specified value lower than the first specified value during restart after the engine is stopped. Therefore, even when the carbon dioxide concentration in the passenger compartment 12 is increased due to refrigerant gas leakage from the refrigeration cycle while the engine is stopped, the ventilation treatment can be performed immediately when the engine is restarted. .

(Second Embodiment)
Next, a second embodiment of the present invention will be described with a focus on differences from the first embodiment.
Now, in this 2nd Embodiment, as shown with a dashed line in FIG.1 and FIG.2, in the piping 24 of the refrigerating cycle 23 in the vehicle air conditioner 14, the gas leak of the carbon dioxide from the refrigerating cycle 23 is detected. A gas pressure sensor 48 is provided as detection means. When the pressure in the refrigeration cycle 23 is reduced due to gas leakage, the value of the gas pressure detected by the gas pressure sensor 48 is output to the control device 44, and the control device 44 determines the gas leakage. The pressure sensors 48 are provided at a plurality of locations in the refrigeration cycle 23, and gas leakage is determined by comprehensively detecting a plurality of detected values from the pressure sensors 48. Further, instead of the pressure sensor 48, a temperature sensor may be provided in the compressor 25, the inside of the piping, or the like to detect a temperature change caused by gas leakage.

  Next, the operation of the second embodiment will be described focusing on the differences from the case of the first embodiment. As shown in FIG. 4, in the second embodiment, the operations of S11 and S12 are performed in addition to the operations of S1 to S10 similar to those of the first embodiment. That is, in the determination of S1, when the carbon dioxide concentration in the passenger compartment 12 detected by the concentration sensor 38 exceeds the first specified value, S2 to S4 as in the case of the first embodiment. Is performed. On the other hand, when the concentration detected by the concentration sensor 38 does not exceed the first specified value, the process proceeds to S11, where the refrigerant gas pressure of carbon dioxide in the refrigeration cycle 23 detected by the gas pressure sensor 48 is detected. It is determined whether or not the pressure is lower than the prescribed pressure value stored in the storage unit 45.

  In the determination of S11, when the detected gas pressure is not lower than the specified value, that is, when carbon dioxide is not leaked, the process returns to S1 and the operations of S1 to S5 and S11 described above are performed. It is executed repeatedly.

  On the other hand, if the detected gas pressure is lower than the specified value due to refrigerant gas leakage from the refrigeration cycle 23, that is, if carbon dioxide is leaking, the process proceeds to S5. As in the case of the first embodiment, the operations of S5 to S10 are executed. That is, if the carbon dioxide of the refrigerant leaking from the refrigeration cycle 23 enters the vehicle compartment 12 and the carbon dioxide concentration in the vehicle compartment 12 may increase abnormally, the carbon dioxide concentration increases in S5. After it is determined that the rate is steep, operations such as forced ventilation are executed in S6 to S10.

  On the other hand, in the determination of S5, when it is determined that the increase rate of the carbon dioxide concentration in the passenger compartment 12 is not steep despite the occurrence of carbon dioxide gas leakage, leakage from the refrigeration cycle 23 occurs. The process proceeds to S12 assuming that the carbon dioxide thus discharged has been released to the outside of the passenger compartment. In S 12, the window 39 is closed by the operation of the window opening / closing actuator 40, and the inside air circulation mode is set by the operation of the inlet damper actuator 19, so that the outside air including the leaked gas into the passenger compartment 12 is discharged. Installation is blocked. At the same time, the alarm device 42 is operated to warn the passenger by sound or light.

  Therefore, also in the second embodiment, substantially the same effect as that described in the first embodiment can be obtained. In the second embodiment, the following effects can be obtained.

  (4) When a gas leak from the refrigeration cycle 23 is detected by the gas pressure sensor 48, if the rate of increase of the carbon dioxide concentration in the passenger compartment 12 is steep, forced ventilation in the passenger compartment 12 is performed, and carbon dioxide When the rate of increase in the carbon concentration is not steep, it is considered that carbon dioxide has been released into the atmosphere, and the introduction of outside air into the passenger compartment 12 is blocked. Therefore, when the carbon dioxide of the refrigerant leaking from the refrigeration cycle 23 enters the passenger compartment 12 and the carbon dioxide concentration in the passenger compartment 12 may increase abnormally, the abnormal state is accurately determined. Then, it is possible to take a countermeasure immediately. Furthermore, when the leaked carbon dioxide does not enter the passenger compartment 12 and is released outside the passenger compartment, it is possible to prevent the carbon dioxide released outside the passenger compartment from being taken into the passenger compartment 12. Can do.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
In each of the above embodiments, a ventilation device including a ventilation fan for exhausting the air in the passenger compartment 12 to the outside through the rear trunk room is provided at the rear of the vehicle 11, and the carbon dioxide in the passenger compartment 12 by the concentration sensor 38 is provided. When the detected value of the concentration exceeds the first specified value and when the rate of increase of the carbon dioxide concentration in the passenger compartment 12 becomes steeper than the specified level, this ventilation is performed along with the opening of the window 39 and the execution of the outside air introduction mode. Configure the equipment for ventilation.

  In each of the above embodiments, only the alarm device 42 is operated when the detected value of the carbon dioxide concentration in the passenger compartment 12 by the concentration sensor 38 exceeds the first specified value. Therefore, when comprised in this way, according to the alarm of the alarm device 42, a passenger | crew will perform ventilation work, such as opening a window.

  -When ventilating the passenger compartment 12, only the opening of the window or the setting of the outside air introduction mode of the air conditioner 14 is performed.

The schematic sectional drawing which shows the vehicle interior air management apparatus of 1st Embodiment. The block diagram which shows the circuit structure of the vehicle interior air management apparatus of FIG. The flowchart which shows the management operation | movement of the same vehicle interior air management apparatus. The flowchart which shows the management operation | movement of the vehicle interior air management apparatus of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Vehicle, 12 ... Vehicle compartment, 14 ... Vehicle air conditioner, 15 ... Air conditioning duct, 16 ... Inside air introduction port, 17 ... Outside air introduction port, 18 ... Introduction port damper, 19 ... Actuator for introduction port damper as vehicle equipment, DESCRIPTION OF SYMBOLS 20 ... Air blower, 22 ... Evaporator, 23 ... Refrigerating cycle, 25 ... Compressor, 26 ... Condenser, 27 ... Throttling device, 38 ... Carbon dioxide concentration sensor, 39 ... Window, 40 ... Actuator for window opening and closing as vehicle equipment, 42 ... Alarm device as vehicle equipment, 44... Control device constituting operation means, determination means and control means, 45... Storage section, 48... Gas pressure sensor as gas leak detection means.

Claims (6)

In a vehicle interior air management apparatus comprising a carbon dioxide concentration sensor for detecting a carbon dioxide concentration in a vehicle interior, and an operating means for operating a predetermined vehicle device when the detected carbon dioxide concentration exceeds a specified value ,
Discriminating means for discriminating the degree of increase in carbon dioxide concentration in the passenger compartment;
A vehicle interior air management apparatus comprising: control means for performing forced ventilation when the degree of increase determined by the determining means is steep than a specified level. 2. The vehicle interior air management device according to claim 1, wherein in the forced ventilation, an opening of a window and an outside air introduction mode of a vehicle air conditioner are executed. The vehicle interior air management device according to claim 2, wherein when the carbon dioxide concentration in the vehicle interior is lower than the specified value, the control means closes the window and maintains the outside air introduction mode. . The vehicle interior air management apparatus according to claim 3, wherein the control unit maintains the outside air introduction mode until the engine is stopped. The control means opens the window when the carbon dioxide concentration sensor detects a carbon dioxide concentration equal to or higher than a second prescribed value lower than the prescribed value when the engine is restarted after the forced ventilation. The vehicle interior air management device according to claim 4. Detection means for detecting a gas leak from the refrigeration cycle of the vehicle air conditioner is provided. The vehicle interior according to any one of claims 2 to 5, wherein ventilation is performed and the introduction of outside air into the vehicle interior is blocked when the rate of increase in carbon dioxide concentration is not steep. Air management device.

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