Ventilation system

Abstract

To provide a ventilation system that can improve accuracy in calibrating an air sensor.SOLUTION: A ventilation system comprises: a ventilation device that performs ventilation of a ventilation space to be ventilated; an air sensor that detects a physical quantity of an object to be detected included in air in the ventilation space and outputs a detected value corresponding to the detected physical quantity; and a sensor calibrating part that performs calibration of the detected value outputted by the air sensor. The sensor calibrating part performs calibration of the detected value detected by the air sensor, at either of a timing when the ventilation device is performing ventilation of the ventilation space in which there is no change generation source that varies the physical quantity of the object to be detected and a timing when the device has completed the ventilation.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a ventilation system.

Background Art

[0002] Conventionally, a vehicle air conditioner using carbon dioxide as a refrigerant has been known (see, for example, Patent Document 1). This vehicle air conditioner includes a refrigeration cycle that circulates carbon dioxide as a refrigerant, and a CO2 sensor that detects the concentration of carbon dioxide to detect refrigerant leakage. And this vehicle air conditioner is configured to ensure the detection accuracy of refrigerant leakage by calibrating the change in the output value due to the secular change of the CO2 sensor.

[0003] The calibration described in Patent Document 1 is performed by rewriting the detection value of the CO2 sensor to the reference value when the difference between the detection value of the CO2 sensor and a predetermined reference value is smaller than a predetermined value, so as to follow the slight change in the detection value due to secular change. The CO2 sensor is provided near the refrigeration cycle device on the engine room side with respect to the dash panel that partitions the vehicle interior and the engine room, and detects the concentration of carbon dioxide near the refrigeration cycle device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The inventors considered a ventilation system that detects the physical quantity of a target substance contained in the air of a space, such as a car interior, in order to improve the comfort of a space where people are present, and ventilates the space according to that physical quantity. The inventors then considered installing an air sensor, such as the CO2 sensor described in Patent Document 1, which detects the physical quantity of a target substance contained in the air of a space, in the space where people are present.

[0006] However, if a CO2 sensor is installed in a space where people are present to detect the concentration of carbon dioxide, the concentration of carbon dioxide in the air of that space will change due to the person's respiration. Therefore, if calibration is performed based on the detected value of the CO2 sensor when people are present and a predetermined reference value, there is a risk that the calibration will not be performed correctly. Thus, in a ventilation system equipped with an air sensor such as a CO2 sensor, if the air sensor is calibrated while a source of change that alters the physical quantity of the detected object exists in the ventilation space being ventilated, there is a risk that the calibration accuracy will deteriorate due to the influence of external disturbances.

[0007] This disclosure aims to provide a ventilation system capable of improving the calibration accuracy of air sensors. [Means for solving the problem]

[0008] The invention described in claim 1 is, It is a ventilation system, A ventilation device (3, 200) that ventilates the ventilation space to be ventilated, An air sensor (5, 210) detects the physical quantity of a target object contained in the air of a ventilated space and outputs a detection value corresponding to the detected physical quantity, It includes a sensor calibration unit (100, 211) that performs calibration on the detected value output by the air sensor, The sensor calibration unit measures the detected values ​​of the air sensor in a ventilated space where there are no change sources (P, F) that alter the physical quantity of the object being detected, at least one of the following times: while the ventilation device is ventilating or after ventilation is complete. The value is at least one of the following: a reference value, which is the detected value detected by the air sensor when the ventilation device ventilates the ventilation space and the ventilation space becomes equivalent to the outside air space, which is the space outside the ventilation space; and a measured value, which is the detected value detected by the air sensor after the ventilation device starts ventilation but before the ventilation space reaches the equivalent of the outside air state. Proofread In addition, when the ventilation system ventilates the ventilation space, the measured values ​​are calibrated based on the ventilation characteristics that show the correlation between the detected value detected by the air sensor in a normal state and the ventilation execution time. .

[0009] According to this, the sensor calibration unit calibrates the detected value from the air sensor when no source of change is present in the ventilation space, thereby suppressing the influence of external disturbances during calibration. This improves the calibration accuracy of the air sensor.

[0010] The reference numerals in parentheses attached to each component indicate an example of the correspondence between that component and the specific components described in the embodiments described later. [Brief explanation of the drawing]

[0011] [Figure 1] This is a diagram showing a ventilation system according to the first embodiment. [Figure 2] This is a diagram showing the configuration of a vehicle air conditioning system according to the first embodiment. [Figure 3] This is a block diagram showing the electrical configuration of the ventilation system according to the first embodiment. [Figure 4] This is a flowchart of the process performed by the air conditioner ECU according to the first embodiment. [Figure 5] This figure shows the change in carbon dioxide concentration due to ventilation by the vehicle air conditioning system according to the first embodiment. [Figure 6] This is a diagram illustrating the calibration performed by the air conditioner ECU according to the first embodiment. [Figure 7] This is a diagram showing a ventilation system according to the second embodiment. [Figure 8] This is a block diagram showing the electrical configuration of the ventilation system according to the second embodiment. [Figure 9] This is a flowchart of the process performed by the air conditioner ECU according to the second embodiment. [Figure 10] This figure shows a state in the ventilation system according to the second embodiment where there are no sources of change in the indoor space. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, parts that are the same as or equivalent to those described in the preceding embodiments may be given the same reference numerals, and the description thereof may be omitted. Further, in the embodiments, when only a part of the components is described, the components described in the preceding embodiments can be applied to the other parts of the components. The following embodiments can be partially combined with each other as long as there is no problem in the combination, even if not particularly specified.

[0013] (First Embodiment) The ventilation system 1 of this embodiment will be described with reference to FIGS. 1 to 6. In this embodiment, as shown in FIG. 1, an example in which the ventilation system 1 is applied to an automobile which is a vehicle B and is used for ventilating the passenger compartment space S which is a ventilation space to be ventilated will be described. The ventilation system 1 of this embodiment is configured to be able to ventilate the passenger compartment space S according to the concentration of carbon dioxide contained in the air in the passenger compartment space S.

[0014] As shown in FIGS. 1 and 2, the ventilation system 1 includes a vehicle air conditioner 3 that ventilates the passenger compartment space S, and a carbon dioxide sensor 5 that detects the concentration of carbon dioxide contained in the air in the passenger compartment space S and outputs a detection value corresponding to the detected concentration. Further, the ventilation system 1 includes a camera 7 that detects whether or not an occupant P, which is a change generation source that changes the concentration of carbon dioxide in the passenger compartment space S by breathing, is present in the passenger compartment space S.

[0015] The vehicle air conditioner 3 is a device that blows out temperature - adjusted air into the vehicle interior space S from the face air outlet 811, foot air outlet 821, and defroster air outlet 831 attached to the surface of the dashboard DB as shown in FIG. 1. The air blown into the vehicle interior space S passes through the vehicle interior space S and is discharged from the gaps of the doors of the vehicle B and the exhaust ports (i.e., drafters) provided at the rear of the vehicle body. Thereby, the vehicle interior space S is ventilated by the vehicle air conditioner 3. In other words, the vehicle air conditioner 3 is a ventilation device that ventilates the vehicle interior space S by blowing air from the face air outlet 811, foot air outlet 821, and defroster air outlet 831 into the vehicle interior space S. And the face air outlet 811, foot air outlet 821, and defroster air outlet 831 are air inlets for introducing air into the vehicle interior space S. Also, the gaps of the doors of the vehicle B and the exhaust ports provided at the rear of the vehicle body are air outlets for discharging air from the vehicle interior space S.

[0016] As shown in FIG. 2, the vehicle air conditioner 3 includes a refrigeration cycle device 10, an air conditioning case 20, an inside - outside air switching door 30, a blower 40, an evaporator 14, a heater core 50, an air mix door 60, a face door 71, a foot door 72, and a defroster door 73. Also, the vehicle air conditioner 3 includes a face duct 81, a foot duct 82, a defroster duct 83, and an air direction adjustment unit 90. Further, as shown in FIG. 3, the vehicle air conditioner 3 includes an inside - outside air mode actuator 30a, a blowing mode actuator 70a, a fan actuator 40a, an air mix actuator 60a, an air - conditioner ECU 100, etc.

[0017] The refrigeration cycle device 10 has a compressor 11 that compresses the refrigerant, a condenser 12 that condenses the high - temperature and high - pressure refrigerant discharged from the compressor 11, an expansion valve 13 that decompresses the refrigerant flowing out of the condenser 12, and an evaporator 14 that evaporates the refrigerant flowing out of the expansion valve 13. Also, the refrigeration cycle device 10 has a refrigerant circuit 15 through which the refrigerant flows.

[0018] The compressor 11 circulates the refrigerant in the refrigeration cycle device 10 by drawing in refrigerant, compressing it, and discharging it. The compressor 11 has an electric motor 11a as shown in Figure 3, and is composed of an electric compressor in which a fixed-capacity compression mechanism with a fixed discharge capacity is rotated by the electric motor 11a. The rotational speed (i.e., refrigerant discharge capacity) of the electric motor 11a is controlled by a control signal output from the air conditioner ECU 100, which will be described later. The air conditioner ECU 100 functions as a compression control unit. A condenser 12 is connected to the discharge port of the compressor 11.

[0019] The condenser 12 is a heat exchanger that cools the refrigerant by exchanging heat between the high-pressure refrigerant discharged from the compressor 11 and the outside air. An expansion valve 13 is connected to the refrigerant outlet side of the condenser 12.

[0020] The expansion valve 13 is a pressure reducer that reduces and expands the refrigerant flowing out of the condenser 12. The operation of the expansion valve 13 is controlled by a control signal output from the air conditioner ECU 100. The evaporator 14 is connected to the refrigerant outlet side of the expansion valve 13.

[0021] The evaporator 14 is an endothermic evaporator that exhibits an endothermic effect by evaporating the refrigerant, which has been depressurized and expanded by the expansion valve 13, and the air flowing inside the air conditioning case 20 through heat exchange. The refrigerant suction side of the compressor 11 is connected to the refrigerant outlet side of the evaporator 14.

[0022] The air conditioning case 20 forms an air passage section 21 by surrounding an air passage through which temperature-controlled air is blown into the vehicle interior space S. As shown in Figure 2, the air conditioning case 20 has an internal air inlet 22 and an external air inlet 23 formed on the upstream side of the air flow direction of the air passage section 21 to take in air into the air passage section 21. The internal air inlet 22 is an intake port that draws in internal air, which is the air in the vehicle interior space S, and the external air inlet 23 is an intake port that draws in external air, which is the air from outside the vehicle. The internal air inlet 22 and the external air inlet 23 are provided with internal / external air switching doors 30 for opening and closing their respective inlets.

[0023] The internal / external air switching door 30 is a component that opens and closes the internal air inlet 22 and the external air inlet 23 to adjust the opening area of ​​the internal air inlet 22 and the external air inlet 23. The internal / external air switching door 30 rotates so that as one of the openings of the internal air inlet 22 and the external air inlet 23 is opened, the other opening is closed. In this way, the internal / external air switching door 30 can adjust the ratio of the amount of internal air and the amount of external air introduced into the air passage section 21 (i.e., the internal / external air ratio). The rotational position of the internal / external air switching door 30 is controlled by the internal / external air mode actuator 30a.

[0024] The internal / external air mode actuator 30a is an actuator that drives the internal / external air switching door 30 and is controlled by the air conditioning ECU 100, as shown in Figure 3. The internal / external air mode actuator 30a controlled by the air conditioning ECU 100 switches the intake mode, which is the open / closed state of the internal air inlet 22 and the external air inlet 23. The internal / external air switching door 30 functions as an intake mode switching unit. The air conditioning ECU 100 also functions as an intake mode control unit.

[0025] Intake modes include, for example, internal air mode, external air mode, and internal / external air mode. Internal air mode is a mode in which the air blown into the vehicle interior space S is internal air when the internal / external air switching door 30 opens the internal air inlet 22 and the external air inlet 23 is closed. External air mode is a mode in which the air blown into the vehicle interior space S is external air when the internal / external air switching door 30 opens the external air inlet 23 and the internal air inlet 22 is closed. Internal / external air mode is a mode in which the air blown into the vehicle interior space S is internal air and external air when the internal / external air switching door 30 opens a portion of both the internal air inlet 22 and the external air inlet 23.

[0026] Furthermore, the air conditioning case 20 has a face opening 24, a foot opening 25, and a defroster opening 26 formed on the downstream side of the airflow direction of the air passage section 21 for blowing air from the air passage section 21 into the vehicle interior space S. The face opening 24 is an opening that mainly directs the air drawn into the air passage section 21 from the interior air intake 22 and the exterior air intake 23 to the upper body of the occupant P. The foot opening 25 is an opening that mainly directs the air drawn into the air passage section 21 from the interior air intake 22 and the exterior air intake 23 to the lower body of the occupant P. The defroster opening 26 is an opening that directs the air drawn into the air passage section 21 from the interior air intake 22 and the exterior air intake 23 to the windshield provided in the vehicle interior space S.

[0027] From the air mix space 27 in the air passage section 21, where air that bypasses the heater core 50 and air that passes through the heater core 50 are mixed, air flows to the face opening 24, foot opening 25, and defroster opening 26.

[0028] The face opening 24, foot opening 25, and defroster opening 26 are each provided with a blowing mode switching unit for opening and closing their respective openings. The blowing mode switching unit consists of a face door 71, a foot door 72, and a defroster door 73. The face door 71 opens and closes the face opening 24. The foot door 72 opens and closes the foot opening 25. The defroster door 73 opens and closes the defroster opening 26. The opening and closing of these face doors 71, foot door 72, and defroster door 73 are controlled by a blowing mode actuator 70a.

[0029] The air outlet mode actuator 70a is an actuator that drives the face door 71, foot door 72, and defroster door 73, and is controlled by the air conditioning ECU 100, as shown in Figure 3. The air outlet mode actuator 70a controlled by the air conditioning ECU 100 switches the air outlet mode, which is the open / closed state of the face opening 24, foot opening 25, and defroster opening 26. The air conditioning ECU 100 functions as an air outlet mode control unit.

[0030] The airflow modes include, for example, face mode, foot mode, defroster mode, and bilevel mode. Face mode is a mode in which the face door 71 is opened to increase the amount of air passing through the face opening 24, and the foot door 72 and defroster door 73 are closed to decrease the amount of air passing through the foot opening 25 and defroster opening 26. As a result, in face mode, the amount of air passing through the foot door 72 and defroster door 73 is suppressed, and the amount of air blown out into the vehicle interior space S via the face opening 24 is increased. Foot mode is a mode in which the foot door 72 and defroster door 73 are opened to increase the amount of air passing through the foot opening 25 and defroster opening 26, and the face door 71 is closed to decrease the amount of air passing through the face opening 24. As a result, in foot mode, the amount of air passing through the face door 71 is suppressed, and the amount of air blown out into the vehicle interior space S via the foot opening 25 and defroster opening 26 is increased.

[0031] The defroster mode is a mode in which the defroster door 73 is opened to increase the amount of air passing through the defroster opening 26, and the face door 71 and foot door 72 are closed to decrease the amount of air passing through the face opening 24 and foot opening 25. As a result, in defroster mode, the amount of air passing through the face opening 24 and foot opening 25 is suppressed, and the amount of air blown out into the vehicle interior space S via the defroster opening 26 is increased. The bi-level mode is a mode in which the face door 71 and foot door 72 are opened to increase the amount of air passing through the face opening 24 and foot opening 25, and the defroster door 73 is closed to decrease the amount of air passing through the defroster opening 26. As a result, in bi-level mode, the amount of air passing through the defroster door 73 is suppressed, and the amount of air blown out into the vehicle interior space S via the face opening 24 and foot opening 25 is increased.

[0032] The face duct 81 has one end connected to the face opening 24, and the other end, the face outlet 811, opens at a position opposite the seat back of the seat ST. Air that has passed from the air passage section 21 through the face opening 24 passes through the face duct 81 and is then blown out into the vehicle interior space S from the face outlet 811. The air blown out from the face outlet 811 flows mainly towards the upper body or surrounding area of ​​the occupant P seated in the driver's seat.

[0033] One end of the foot duct 82 is connected to the foot opening 25, and the other end, the foot outlet 821, opens on the dashboard DB facing the foot space in front of the seat cushion of the seat ST. Air that has passed from the air passage section 21 through the foot opening 25 passes through the foot duct 82 and is then blown out into the vehicle interior space S from the foot outlet 821. The air blown out from the foot outlet 821 flows mainly towards the lower body or surrounding area of ​​the occupant P seated in the seat ST.

[0034] The defroster duct 83 has one end connected to the defroster opening 26, and the other end, the defroster outlet 831, opens on the dashboard DB facing the windshield. Air that has passed from the air passage section 21 through the defroster opening 26 passes through the defroster duct 83 and is then blown out into the vehicle interior space S from the defroster outlet 831. The air blown out from the defroster outlet 831 flows towards the windshield or its surroundings.

[0035] Furthermore, as shown in Figure 2, a wind direction adjustment unit 90 is attached to the face vent 811. In contrast, the foot vent 821 and the defroster vent 831 are not equipped with a wind direction adjustment unit 90. The wind direction adjustment unit 90 adjusts the direction of the air blown from the face vent 811 into the vehicle interior space S by guiding the air. Specifically, by changing the orientation of the wind direction adjustment unit 90, the direction of the airflow blown from the face vent 811 changes in the vehicle width direction and the vertical direction of the vehicle B.

[0036] Furthermore, the wind direction adjustment unit 90 of this embodiment is configured to be able to cover the face outlet 811 by changing its orientation, thereby closing the face outlet 811. The wind direction adjustment unit 90 may be a plate-shaped member or may have other shapes. The wind direction adjustment unit 90 of this embodiment is composed of a louver whose orientation can be changed by operation by the occupant P.

[0037] The blower 40 includes a blower fan 41 and a fan actuator 40a. The blower fan 41 rotates to introduce interior air into the air passage section 21 if the interior air inlet 22 is open, or outside air into the air passage section 21 if the exterior air inlet 23 is open, and sends the introduced air downstream of the airflow of the blower fan 41 within the air passage section 21. The blower 40 then blows the air introduced from the interior air inlet 22 and the exterior air inlet 23 into the vehicle interior space S from the face outlet 811, foot outlet 821 and defroster outlet 831, generating an airflow that flows towards the gaps in the doors and exhaust vents of the vehicle B. The fan actuator 40a is an actuator that drives the blower fan 41 and is controlled by the air conditioning ECU 100, as shown in Figure 3. In other words, the fan actuator 40a controls the amount of air blown by the blower 40. The air conditioner ECU 100 functions as a blower control unit that controls the amount of air blown by the blower 40.

[0038] The evaporator 14 is positioned in the air passage section 21, downstream of the airflow from the blower fan 41. The evaporator 14 cools the air supplied from the blower fan 41. The evaporator 14, together with the compressor 11, condenser 12, and expansion valve 13, constitutes a refrigeration cycle. As the refrigerant flowing through the refrigeration cycle passes through the evaporator 14, heat exchange occurs between the refrigerant and the air. This heat exchange causes the refrigerant to evaporate and the air to cool. A heater core 50 is positioned downstream of the evaporator 14 in the air passage section 21.

[0039] The heater core 50 is positioned within the air passage section 21, downstream of the airflow of the evaporator 14. The heater core 50 is a heating unit that heats the air that has passed through the evaporator 14. Engine coolant flows through the heater core 50, and the air is heated by heat exchange between this engine coolant and the air.

[0040] The air mix door 60 is located between the evaporator 14 and the heater core 50 within the air conditioning case 20. The air mix door 60 is a door that adjusts the ratio (i.e., air mix ratio) of the airflow from the evaporator 14 that bypasses the heater core 50 to the airflow that passes through the heater core 50. The air mix actuator 60a is an actuator that drives the air mix door 60 and is controlled by the air conditioning ECU 100, as shown in Figure 3. The air mix ratio is adjusted by the air mix actuator 60a controlled by the air conditioning ECU 100. The air conditioning ECU 100 functions as an air mix door control unit.

[0041] Furthermore, as shown in Figure 3, the vehicle air conditioning system 3 includes a sensor group 8 and an operating unit 9. The sensor group 8 acquires information necessary for the vehicle air conditioning system 3 to perform operations according to various settings input by the occupant P through the operating unit 9. The sensor group 8 consists of, for example, an outside air temperature sensor that detects the temperature of the outside air, an inside air temperature sensor that detects the temperature inside the vehicle, and a solar radiation sensor that detects the amount of solar radiation entering the vehicle.

[0042] The control unit 9 is a device that receives input operations from the occupant P. The control unit 9 includes, for example, an operation switch to turn the vehicle air conditioning system 3 on and off, a temperature setting switch to set the temperature of the blown air, an intake mode switch to switch the intake mode, an exhaust mode switch to switch the exhaust mode, and so on.

[0043] The air conditioner ECU 100 includes a processing unit 101, a storage unit 102, and the like. The storage unit 102 includes various types of memory such as RAM, ROM, and flash memory. RAM is a writable volatile storage medium. ROM is a non-writable non-volatile storage medium. Flash memory is a writable non-volatile storage medium. The processing unit 101, which corresponds to the CPU, executes programs (not shown) stored in ROM and flash memory, and uses RAM as a working area during execution to realize various processes described later. RAM, ROM, and flash memory are all non-transitional physical storage media. For simplicity, the processes performed by the processing unit 101 will be described below as processes performed by the air conditioner ECU 100.

[0044] The carbon dioxide sensor 5 is a carbon dioxide detection unit that detects the concentration of carbon dioxide contained in the air of the vehicle's interior space S. In other words, the carbon dioxide sensor 5 is an air sensor that detects the concentration of carbon dioxide, which is a physical quantity of the substance to be detected. As shown in Figure 3, the carbon dioxide sensor 5 is connected to the air conditioner ECU 100 and outputs a detection value corresponding to the detected concentration to the air conditioner ECU 100.

[0045] Furthermore, as shown in Figure 1, the carbon dioxide sensor 5 is installed in the vehicle interior space S where the occupant P is present. Specifically, the carbon dioxide sensor 5 is installed on the surface of the dashboard DB on the vehicle interior space S side relative to the dash panel DP that separates the vehicle interior space S from the engine compartment. The carbon dioxide sensor 5 detects the carbon dioxide concentration in the vehicle interior space S when the occupant P is present, and detects the carbon dioxide concentration in the vehicle interior space S when the occupant P has left the vehicle B and is no longer present in the vehicle interior space S.

[0046] Camera 7 is an occupant detection device that detects whether or not an occupant P is present in the vehicle interior space S. Camera 7 is composed of, for example, a thermal camera that detects temperature, and acquires infrared radiation emitted from a predetermined shooting range, and based on the acquired infrared radiation, generates and outputs an image in which the surface temperature at each position within the shooting range is represented as a pixel value. The shooting range of camera 7 includes the entire body of occupant P when occupant P is seated in the seat ST. Such camera 7 functions as a source detection unit that detects whether or not an occupant P, who is a source of change that changes the concentration of carbon dioxide in the vehicle interior space S through respiration, is present in the vehicle interior space S. As shown in Figure 3, camera 7 is connected to the air conditioning ECU 100 and outputs the information of the captured image to the air conditioning ECU 100.

[0047] In this embodiment, the ventilation system 1, configured as described above, operates the vehicle air conditioning system 3 based on the carbon dioxide concentration detected by the carbon dioxide sensor 5. Specifically, the ventilation system 1 operates the vehicle air conditioning system 3 so that the carbon dioxide concentration in the vehicle interior space S is within a predetermined range. For example, when the carbon dioxide concentration detected by the carbon dioxide sensor 5 exceeds a predetermined upper limit, the ventilation system 1 activates the vehicle air conditioning system 3 to start ventilation. Then, when the carbon dioxide concentration in the vehicle interior space S decreases due to the ventilation by the vehicle air conditioning system 3 and the carbon dioxide concentration detected by the carbon dioxide sensor 5 falls below a predetermined lower limit, the ventilation system 1 stops operating the vehicle air conditioning system 3 and ends the ventilation. By operating the vehicle air conditioning system 3 in this way, the ventilation system 1 maintains the carbon dioxide concentration in the vehicle interior space S within a predetermined range.

[0048] This explains why the carbon dioxide concentration in the vehicle's interior space S is maintained within a predetermined range.

[0049] In the relatively confined space of a vehicle's interior (S), the carbon dioxide concentration is more likely to rise than that of the outside air due to the respiration of the occupant (P). When the carbon dioxide concentration in the air inside the vehicle's interior (S) becomes higher than that of the outside air, it can lead to drowsiness in the occupant (P), decreased driver concentration, and shortness of breath, thus reducing the comfort of the occupant (P).

[0050] For example, the carbon dioxide concentration in typical outdoor vehicle air is around 500 ppm. In contrast, in environments with a carbon dioxide concentration higher than 2500 ppm, occupant P may experience drowsiness or decreased concentration. Furthermore, in environments with a carbon dioxide concentration higher than 10000 ppm, occupant P may experience increased respiratory rate or tremors in their hands and feet. And in environments with a carbon dioxide concentration higher than 50000 ppm, occupant P may experience dizziness, headaches, or difficulty breathing.

[0051] Therefore, it is desirable to maintain the vehicle interior space S in a state as close as possible to the carbon dioxide concentration of the outside air by ventilating the vehicle interior space S.

[0052] For the reasons stated above, the ventilation system 1 starts ventilation by the vehicle air conditioning system 3 when the detected value of the carbon dioxide sensor 5 exceeds a predetermined upper limit, and stops ventilation by the vehicle air conditioning system 3 when the detected value of the carbon dioxide sensor 5 falls below a predetermined lower limit.

[0053] For example, the upper limit is predetermined in the memory unit 102 of the air conditioner ECU 100, for example, 2500 ppm. The lower limit is also predetermined in the memory unit 102 of the air conditioner ECU 100, for example, 1000 ppm. Note that these upper and lower limits are not limited to the above values ​​and can be set as appropriate.

[0054] Furthermore, the ventilation system 1 may be configured such that the vehicle air conditioning system 3 can perform ventilation at any time based on input operations from the occupant P on the control unit 9.

[0055] Incidentally, the carbon dioxide concentration detected by the carbon dioxide sensor 5 when the vehicle air conditioning system 3 performs ventilation may deviate from the actual carbon dioxide concentration due to aging and other factors. In other words, there is a possibility of an error between the carbon dioxide concentration detected by the carbon dioxide sensor 5 in the vehicle interior space S while the vehicle air conditioning system 3 is performing ventilation and the actual carbon dioxide concentration in the vehicle interior space S. For this reason, it is necessary to perform calibration on the detected value of the carbon dioxide sensor 5 as appropriate to suppress this error.

[0056] Furthermore, when performing calibration on the detected value of the carbon dioxide sensor 5, if an occupant P is present in the vehicle interior space S, the detected value will fluctuate due to the occupant P's breathing. For this reason, when performing calibration on the detected value of the carbon dioxide sensor 5 while the vehicle air conditioning system 3 is performing ventilation, it is desirable to perform the calibration when no occupant P is present in the vehicle interior space S.

[0057] Therefore, in this embodiment, the ventilation system 1 is configured such that the air conditioner ECU 100, to which the camera 7 and carbon dioxide sensor 5 are connected, can perform calibration based on the detected value detected by the carbon dioxide sensor 5. The air conditioner ECU 100 performs calibration based on the detected value detected by the carbon dioxide sensor 5 when the vehicle air conditioning system 3 is performing ventilation, while there are no occupants P in the vehicle interior space S.

[0058] The following describes the operation of the air conditioner ECU 100 when it performs calibration in the ventilation system 1 configured as described above, while the vehicle air conditioning unit 3 is performing ventilation and there are no occupants P in the vehicle interior space S.

[0059] First, let's explain how the vehicle air conditioning system 3 operates when it performs ventilation. When the vehicle air conditioning system 3 performs ventilation, the air conditioning ECU 100 sets the operating conditions of the various components of the vehicle air conditioning system 3 as follows. Specifically, when the air conditioning ECU 100 performs ventilation, it activates the internal / external air mode actuator 30a to open the external air inlet 23 with the internal / external air switching door 30 and close the internal air inlet 22. In other words, when performing ventilation, the air conditioning ECU 100 switches the intake mode to the external air mode.

[0060] Furthermore, the air conditioning ECU 100 activates the air outlet mode actuator 70a to switch the air outlet mode to either foot mode or defroster mode using the face door 71, foot door 72, and defroster door 73. Specifically, when the air conditioning ECU 100 switches the air outlet mode to foot mode, it activates the air outlet mode actuator 70a to open the foot door 72 and defroster door 73, and close the face door 71. Also, when the air conditioning ECU 100 switches the air outlet mode to defroster mode, it activates the air outlet mode actuator 70a to open the defroster door 73, and close the face door 71 and foot door 72. In other words, when ventilating, the air conditioning ECU 100 switches the air outlet mode to either foot mode or defroster mode.

[0061] As mentioned above, a wind direction adjustment unit 90 is attached to the face outlet 811. Therefore, the direction of the airflow blown out from the face outlet 811 is changed in the vehicle width direction and the vertical direction of the vehicle B depending on the position of the wind direction adjustment unit 90. Alternatively, when the face outlet 811 is covered by the wind direction adjustment unit 90, the face outlet 811 is closed. For this reason, when the blowing mode is set to face mode, the wind direction of the air blown from the face outlet 811 into the vehicle interior space S varies greatly depending on the position of the wind direction adjustment unit 90.

[0062] In contrast, the foot outlet 821 and the defroster outlet 831 are not equipped with airflow adjustment units 90. Therefore, when the airflow mode is switched to either the foot mode or the defroster mode, the direction of the air blown into the vehicle interior space S becomes almost constant. In other words, the vehicle air conditioning system 3 makes the direction of the air blown into the vehicle interior space S by the blower 40 during ventilation nearly constant by switching the airflow mode to either the foot mode or the defroster mode when ventilating.

[0063] Then, when performing ventilation, the air conditioner ECU 100 activates the fan actuator 40a to drive the blower fan 41 so that the amount of air blown by the blower 40 remains constant. Specifically, the air conditioner ECU 100 drives the blower fan 41 so that the amount of air blown is kept at the minimum. In other words, when performing ventilation, the air conditioner ECU 100 keeps the amount of air blown by the blower 40 constant and at the minimum.

[0064] Furthermore, when ventilation is performed, the air conditioning ECU 100 activates the air mix actuator 60a to control the position of the air mix door 60 so that all the air flowing out from the evaporator 14 bypasses the heater core 50. In other words, when ventilation is performed, the air conditioning ECU 100 controls the position of the air mix door 60 so that all the air that has passed through the evaporator 14 is blown into the vehicle interior space S without passing through the heater core 50.

[0065] Then, when the air conditioner ECU 100 performs ventilation, it stops the rotation of the electric motor 11a and stops the compression mechanism of the compressor 11 which is rotationally driven by the electric motor 11a. In other words, when the air conditioner ECU 100 performs ventilation, it stops the operation of the compressor 11 and prohibits the circulation of refrigerant in the refrigerant circuit 15.

[0066] When the vehicle air conditioning system 3 performs ventilation in this manner, the air conditioning ECU 100 controls various actuators and modes. As a result, the air drawn into the airflow channel 21 from the outside air inlet 23 by the rotation of the blower fan 41 passes through the evaporator 14 and flows to the downstream side of the airflow of the evaporator 14. The air that has flowed to the downstream side of the airflow of the evaporator 14 flows into the air mix space 27 without all of it passing through the heater core 50. If the blowing mode is set to foot mode, the air that has flowed into the air mix space 27 is blown out into the vehicle interior space S from the foot outlet 821 via the foot opening 25. If the blowing mode is set to defroster mode, the air is blown out into the vehicle interior space S from the defroster outlet 831 via the defroster opening 26.

[0067] The air blown into the vehicle interior space S from the foot vent 821 or the defroster vent 831 passes through the vehicle interior space S and is discharged outside the vehicle through the gap in the vehicle B's door and an exhaust vent located at the rear of the vehicle body. In this way, the air conditioner ECU 100 sets the execution conditions for ventilation as described above. As a result, the vehicle interior space S is ventilated. Consequently, the carbon dioxide concentration in the vehicle interior space S, which rose due to the occupant P's breathing, decreases compared to before ventilation by the vehicle air conditioning system 3 after the occupant P disembarks. The air conditioner ECU 100 then terminates the ventilation by the vehicle air conditioning system 3 when the detected value detected by the carbon dioxide sensor 5 falls below a predetermined lower limit.

[0068] Next, the operation of the air conditioner ECU 100 when calibrating the detected value of the carbon dioxide sensor 5 will be explained with reference to Figures 4 to 6. Figures 5 and 6 show a state in which an error occurs between the detected value of the carbon dioxide concentration in the vehicle interior space S detected by the carbon dioxide sensor 5 and the actual carbon dioxide concentration in the vehicle interior space S, with the solid line showing the detected value and the dashed line showing the actual value. Figures 5 and 6 show the case in which the detected value of the carbon dioxide concentration detected by the carbon dioxide sensor 5 is larger than the actual value, but the ventilation system 1 of this embodiment can also be applied when the detected value of the carbon dioxide concentration detected by the carbon dioxide sensor 5 is smaller than the actual value.

[0069] As shown in Figure 4, first, in step S10, the air conditioning ECU 100 determines whether or not an occupant P is present in the vehicle interior space S based on the image output from the camera 7. For example, if the camera 7 is a thermal camera, the air conditioning ECU 100 determines whether or not an occupant P is seated in the seat ST based on an image corresponding to the surface temperature within the shooting range, which is generated based on the infrared radiation acquired by the camera 7.

[0070] If the air conditioning ECU 100 determines in step S10 that an occupant P is present in the vehicle interior space S, it repeatedly executes step S10. In other words, the air conditioning ECU 100 repeatedly executes step S10 until it determines in step S10 that an occupant P is not present in the vehicle interior space S.

[0071] If the vehicle air conditioning system 3 does not determine in step S10 that an occupant P is present, in step S20, the air conditioning ECU 100 stores the detected carbon dioxide concentration value transmitted from the carbon dioxide sensor 5 in the storage unit 102. Here, the carbon dioxide concentration detected by the carbon dioxide sensor 5 decreases over time due to ventilation by the vehicle air conditioning system 3. Therefore, as shown in Figure 5, the detected carbon dioxide concentration value transmitted from the carbon dioxide sensor 5 decreases over time. Specifically, the detected carbon dioxide concentration value transmitted from the carbon dioxide sensor 5 decreases linearly over time.

[0072] Then, in step S30, the air conditioner ECU 100 determines whether the fluctuation in the carbon dioxide concentration detected by the carbon dioxide sensor 5 has moved within a predetermined stable range due to the ventilation performed by the vehicle air conditioning system 3.

[0073] The air conditioner ECU 100 repeatedly executes step S20 until it determines that the fluctuation in the carbon dioxide concentration detected by the carbon dioxide sensor 5 has moved within a predetermined stable range. In other words, the air conditioner ECU 100 repeatedly stores the carbon dioxide concentration detected by the carbon dioxide sensor 5 until the fluctuation in the carbon dioxide concentration detected by the carbon dioxide sensor 5 has moved within a predetermined stable range. To put it another way, by repeatedly executing step S20, the air conditioner ECU 100 stores the carbon dioxide concentration detected by the carbon dioxide sensor 5, which decreases over time, for each control cycle. When it determines that the fluctuation in the carbon dioxide concentration has moved within a predetermined stable range, the air conditioner ECU 100 executes step S40.

[0074] Here, we will explain the state in which the detected carbon dioxide concentration fluctuates within a predetermined stable range. As mentioned above, the carbon dioxide concentration in typical outside-vehicle air is around 350 ppm to 450 ppm, and has a certain range. In other words, the carbon dioxide concentration in outside-vehicle air is not constant. For this reason, when the vehicle air conditioning system 3 ventilates by blowing outside-vehicle air into the vehicle interior space S, the carbon dioxide concentration in the air of the vehicle interior space S will not be constant even after sufficient ventilation time. In other words, even when the vehicle air conditioning system 3 ventilates the vehicle interior space S, creating an outside air equivalent state, the carbon dioxide concentration in the air of the vehicle interior space S will not be constant.

[0075] Therefore, as shown in Figure 5, the carbon dioxide concentration detected by the carbon dioxide sensor 5 may fluctuate over time by a certain range, similar to the typical carbon dioxide concentration outside a vehicle, even when the vehicle interior space S is equivalent to outside air. For example, the detected values ​​detected multiple times by the carbon dioxide sensor 5 over a predetermined period may fluctuate by approximately ±50 ppm relative to a reference detected value. In such cases, the ventilation by the vehicle air conditioning system 3 brings the vehicle interior space S to a state equivalent to outside air, and the fluctuation in the detected carbon dioxide concentration returns to a predetermined stable range.

[0076] Hereinafter, the detected value detected by the carbon dioxide sensor 5 when the fluctuation of the detected carbon dioxide concentration falls within a predetermined stable range will be referred to as the reference value. The reference value may be, for example, the first detected value detected by the carbon dioxide sensor 5 after it is determined that the fluctuation of the detected carbon dioxide concentration has fallen within a predetermined stable range. Alternatively, the reference value may be the average, maximum, or minimum value of the detected values ​​detected multiple times by the carbon dioxide sensor 5 over a predetermined period when the fluctuation of the detected carbon dioxide concentration falls within a predetermined stable range. The air conditioner ECU 100 stores the reference value in the storage unit 102.

[0077] Then, if it is determined that the fluctuation in the detected carbon dioxide concentration has moved within a predetermined stable range, in step S40, the air conditioner ECU 100 calibrates the stored reference value to approach the value equivalent to the outside air. In other words, when the vehicle interior space S reaches a state equivalent to the outside air, the air conditioner ECU 100 calibrates the reference value to approach the value equivalent to the outside air.

[0078] Here, the outside air equivalent value is a value corresponding to the carbon dioxide concentration in the air outside the vehicle, and is set by a value obtained in advance through experiments, for example. The outside air equivalent value may be set to any value between 350 ppm and 450 ppm, which are typical carbon dioxide concentrations in the air outside the vehicle. The outside air equivalent value is pre-set in the storage unit 102.

[0079] In this embodiment, as shown in Figure 5, the reference value is higher than the value equivalent to the outside air. Therefore, the air conditioner ECU 100 calibrates the reference value transmitted from the carbon dioxide sensor 5 by reducing it so that it approaches the value equivalent to the outside air. Specifically, the air conditioner ECU 100 calibrates the reference value so that the reference value transmitted from the carbon dioxide sensor 5 matches the value equivalent to the outside air.

[0080] Then, in step S50, the air conditioner ECU 100 calibrates the measured value. Here, the measured value is the value detected by the carbon dioxide sensor 5 after the vehicle air conditioning system 3 starts ventilation but before the interior space S reaches a state equivalent to outside air, and is the value detected before reaching the reference value. In other words, the measured value is the value detected by the carbon dioxide sensor 5 in the state before the interior space S reaches a state equivalent to outside air.

[0081] Specifically, the air conditioning ECU 100 calibrates the measured values ​​based on the ventilation characteristics, which show the correlation between the detected value detected by the carbon dioxide sensor 5 in a normal state and the ventilation execution time when the vehicle air conditioning system 3 ventilates the vehicle interior space S. Here, the carbon dioxide sensor 5 in a normal state outputs a detected value that is approximately equal to the actual carbon dioxide concentration in the vehicle interior space S. Therefore, the carbon dioxide sensor 5 in a normal state outputs a detected value that is approximately equal to the actual carbon dioxide concentration in the vehicle interior space S, as shown by the dashed line in Figure 5. Then, as the vehicle air conditioning system 3 ventilates the vehicle interior space S, this detected value decreases linearly over time, as shown in Figure 5. In this case, the ventilation characteristics show the amount of change in the detected value that decreases during a predetermined period Δt of the ventilation execution time.

[0082] The ventilation characteristics are set based on the detected values ​​obtained when the vehicle air conditioning system 3 ventilates the vehicle interior space S when there are no occupants P in the vehicle interior space S. Furthermore, the ventilation characteristics can be obtained in advance through experiments to determine the detected values ​​of the carbon dioxide sensor 5 in a normal state when the vehicle air conditioning system 3 ventilates the vehicle interior space S. The ventilation characteristics are pre-set in the memory unit 102.

[0083] The experiment to obtain the ventilation characteristics is conducted by operating the vehicle air conditioning system 3 under the same operating conditions as when the vehicle air conditioning system 3 ventilates the vehicle interior space S. In other words, when the vehicle air conditioning system 3 ventilates the vehicle interior space S, it performs ventilation under the same operating conditions as when the experiment to obtain the ventilation characteristics is conducted.

[0084] In this embodiment, as shown in Figure 5, the measured value is higher than the actual value. Therefore, the air conditioner ECU 100 calibrates the measured value transmitted from the carbon dioxide sensor 5 by reducing it so that it approaches the actual value. Specifically, the air conditioner ECU 100 calibrates each measured value detected each time a measurement is taken so that the linearly decreasing measured value coincides with the linearly decreasing actual value. In this embodiment, the air conditioner ECU 100 functions as a sensor calibration unit that performs calibration on the detected value output by the carbon dioxide sensor 5.

[0085] By calibrating the reference value and the measured value in this way, the error in the detected value detected after calibration can be reduced compared to the error before calibration. Therefore, the error in the measured value detected by the carbon dioxide sensor 5 after the occupant P boards the vehicle B and the vehicle's air conditioning system 3 starts ventilation can be reduced.

[0086] According to this, even if occupant P enters vehicle B again after calibration and the carbon dioxide concentration in the vehicle interior space S increases due to occupant P's breathing, the detected value of the carbon dioxide sensor 5 can be brought closer to the actual carbon dioxide concentration in the vehicle interior space S. For example, as shown in Figure 6, if the reference value and measured value before calibration are larger than the actual values, the detected value of the carbon dioxide sensor 5 after calibration can be brought closer to the actual carbon dioxide concentration by calibrating to reduce the reference value and measured value.

[0087] In this embodiment, ventilation by the vehicle air conditioning system 3 is terminated when it is determined that the fluctuation in the detected carbon dioxide concentration has moved within a predetermined stable range. In this case, the air conditioner ECU 100 performs calibration after the vehicle air conditioning system 3 has finished ventilating the vehicle interior space S.

[0088] As described above, the ventilation system 1 of this embodiment includes a vehicle air conditioning unit 3 that ventilates the vehicle interior space S, and a carbon dioxide sensor 5 that detects the carbon dioxide concentration in the air of the vehicle interior space S and outputs an output value corresponding to the detected carbon dioxide concentration. The ventilation system 1 also includes an air conditioner ECU 100 that performs calibration based on the detected value output by the carbon dioxide sensor 5.

[0089] The air conditioning ECU 100 calibrates the vehicle's interior space S, where there are no occupants P who would alter the carbon dioxide concentration, based on the values ​​detected by the carbon dioxide sensor 5 while the vehicle's air conditioning system 3 is ventilating.

[0090] According to this, the air conditioner ECU 100 performs calibration based on the detected value when there is no occupant P present to change the carbon dioxide concentration in the vehicle interior space S. Therefore, calibration can be performed while suppressing fluctuations in carbon dioxide concentration due to the occupant P's respiration. In other words, the air conditioner ECU 100 can perform calibration while suppressing the influence of disturbances that cause fluctuations in the carbon dioxide concentration detected by the carbon dioxide sensor 5. As a result, the calibration accuracy of the carbon dioxide sensor 5 can be improved.

[0091] Furthermore, according to the above embodiment, the following effects can be obtained.

[0092] (1) In the above embodiment, the air conditioner ECU 100 calibrates the reference value detected by the carbon dioxide sensor 5 when the vehicle interior space S becomes equivalent to outside air conditions as the vehicle air conditioning system 3 performs ventilation of the vehicle interior space S. Furthermore, the air conditioner ECU 100 calibrates the measured value detected by the carbon dioxide sensor 5 after the vehicle air conditioning system 3 starts ventilation but before the vehicle interior space S reaches an equivalent to outside air conditions.

[0093] According to this, the measurement accuracy of the carbon dioxide sensor 5 can be improved compared to when the air conditioner ECU 100 calibrates only one of the reference value or the measured value. For example, compared to when the air conditioner ECU 100 calibrates only the reference value, the calibration accuracy of the measured value detected by the carbon dioxide sensor 5 before the outside air equivalent condition is reached can be improved.

[0094] (2) In the above embodiment, the air conditioner ECU 100 is calibrated so that the reference value approaches the outside air reference value.

[0095] According to this method, the calibration accuracy relative to the reference value can be improved by calibrating the reference value to be closer to the ambient air reference value.

[0096] (3) In the above embodiment, the state equivalent to outside air is a state in which the fluctuation of the detected value detected by the carbon dioxide sensor 5 falls within a predetermined stable range. When the vehicle interior space S reaches the state equivalent to outside air, the air conditioner ECU 100 calibrates the reference value.

[0097] According to this method, by calibrating the reference value when the fluctuation of the detected value reaches a predetermined stable range, the calibration accuracy of the reference value can be further improved compared to calibrating the reference value based on the detected value before the fluctuation of the detected value reaches the predetermined stable range.

[0098] (4) In the above embodiment, the air conditioner ECU 100 calibrates the measured values ​​based on the ventilation characteristics that show the correlation between the detected value detected by the carbon dioxide sensor 5, which is in a normal state when the vehicle air conditioning system 3 is ventilating, and the ventilation execution time.

[0099] According to this method, the calibration accuracy of the measured values ​​can be improved by calibrating them based on ventilation characteristics.

[0100] (5) In the above embodiment, the ventilation characteristics are set based on the detected values ​​obtained when the vehicle air conditioning system 3 ventilates the vehicle interior space S when there are no occupants P in the vehicle interior space S.

[0101] When obtaining ventilation characteristics, if an occupant P is present in the vehicle interior space S, the ventilation characteristics may fluctuate due to the occupant P's breathing. Therefore, compared to calibrating the measured values ​​based on the ventilation characteristics obtained when the vehicle air conditioning system 3 ventilates the vehicle interior space S with an occupant P present, the calibration accuracy of the measured values ​​can be further improved.

[0102] (6) In the above embodiment, the vehicle air conditioning system 3 ventilates the vehicle interior space S under the same ventilation conditions as those used to obtain the ventilation characteristics.

[0103] According to this, by matching the ventilation execution conditions when the vehicle air conditioning system 3 obtains ventilation characteristics with the ventilation execution conditions when actually performing ventilation, the calibration accuracy of the measured values ​​when calibrating based on the detected values ​​detected by the carbon dioxide sensor 5 can be further improved.

[0104] (7) In the above embodiment, when the vehicle air conditioning system 3 performs ventilation, the blowing mode is switched to either the foot mode or the defroster mode. Then, by mainly blowing air from only the foot outlet 821, which does not have the airflow adjustment unit 90 installed, or from both the foot outlet 821 and the defroster outlet 831, the direction of the airflow into the vehicle interior space S is made to be nearly constant. In other words, when the vehicle air conditioning system 3 performs ventilation, it switches the blowing mode to either the foot mode or the defroster mode, thereby making the direction of the airflow into the vehicle interior space S by the blower 40 when performing ventilation as close to constant as possible.

[0105] According to this, when ventilating, it becomes easier to keep the amount of air per unit time constant, which is introduced from the foot outlet 821 and defroster outlet 831, which are the air inlets of the vehicle interior space S, and discharged from the gaps in the doors and exhaust ports of the vehicle B, which are the air outlets of the vehicle interior space S. As a result, when the vehicle air conditioning system 3 performs ventilation, it becomes easier to keep the amount of change per unit time of the carbon dioxide concentration in the air of the vehicle interior space S, which changes due to ventilation, constant. Therefore, the calibration accuracy of the measurement values ​​when the air conditioner ECU 100 calibrates the measurement values ​​based on the ventilation characteristics can be further improved.

[0106] (8) In the above embodiment, the air conditioner ECU 100 minimizes the amount of air blown by the blower 40 when performing ventilation.

[0107] According to this, the power consumption of the vehicle's air conditioning system 3 when performing ventilation can be reduced.

[0108] (9) In the above embodiment, the vehicle air conditioning system 3 has a blower 40 that generates an airflow that flows from the foot outlet 821 and the defroster outlet 831 that introduce air into the vehicle interior space S toward the gap in the vehicle door and the exhaust port of the vehicle B that discharges air from the vehicle interior space S. The amount of air blown by the blower 40 is constant when the vehicle air conditioning system 3 is performing ventilation.

[0109] According to this, it becomes easier to keep the amount of air per unit time constant, which is introduced from the foot outlet 821 and defroster outlet 831 (which are air inlets) and discharged from the gaps in the doors of vehicle B and the exhaust ports (which are air outlets). As a result, when the vehicle air conditioning system 3 performs ventilation, it becomes easier to keep the amount of change per unit time of the carbon dioxide concentration in the air in the vehicle interior space S, which changes due to ventilation, constant. Therefore, the calibration accuracy of the measurement values ​​when the air conditioner ECU 100 calibrates the measurement values ​​based on the ventilation characteristics can be further improved.

[0110] (10) In the above embodiment, the vehicle air conditioning system 3 is configured to ventilate the vehicle interior space S by drawing in air and blowing the drawn-in air into the vehicle interior space S. The vehicle air conditioning system 3 has a face opening 24 that guides the drawn-in air to the upper body of the occupant P, a foot opening 25 that guides the drawn-in air to the lower body of the occupant P, and a defroster opening 26 that guides the drawn-in air to the windshield. Furthermore, the vehicle air conditioning system 3 has a face door 71, a foot door 72, and a defroster door 73 that switch the blowing mode between defroster mode, face mode, and foot mode, and an air conditioning ECU 100 that controls the operation of the face door 71, the foot door 72, and the defroster door 73. When ventilating, the air conditioning ECU 100 switches the blowing mode to either foot mode or defroster mode.

[0111] By the way, when the vehicle air conditioning system 3 is set to face mode for ventilation, the direction of the air blown out from the face outlet 811 is switched according to the position of the air direction adjustment unit 90, which changes the direction of the blown air. Also, if the face outlet 811 is blocked by the air direction adjustment unit 90, the vehicle air conditioning system 3 may not be able to blow air into the vehicle interior space S when ventilating. In that case, when the vehicle air conditioning system 3 is ventilating, it becomes difficult to keep the rate of change per unit time of the carbon dioxide concentration in the air of the vehicle interior space S, which changes due to ventilation, constant.

[0112] In contrast, the foot vent 821 and the defroster vent 831 are not equipped with an airflow direction adjustment unit 90 to change the direction of the blown air. Therefore, when ventilating, the direction of the air blown from the foot vent 821 and the defroster vent 831 into the vehicle interior space S is not switched by selecting either the foot mode or the defroster mode. Also, the foot vent 821 and the defroster vent 831 are not blocked by the airflow direction adjustment unit 90. In other words, when the vehicle air conditioning system 3 ventilates, the direction of the air blown into the vehicle interior space S can be kept as close to constant as possible.

[0113] According to this, it becomes easier to keep the amount of air blown out per unit time from the foot outlet 821 and the defroster outlet 831 constant. As a result, when the vehicle air conditioning system 3 performs ventilation, it becomes easier to keep the amount of change per unit time of the carbon dioxide concentration in the air in the vehicle interior space S, which changes due to ventilation, constant. Therefore, the calibration accuracy of the measurement values ​​when the air conditioner ECU 100 calibrates the measurement values ​​based on the ventilation characteristics can be further improved.

[0114] (11) In the above embodiment, the vehicle air conditioning system 3 is configured to ventilate the vehicle interior space S by drawing in air and blowing the drawn-in air into the vehicle interior space S. The vehicle air conditioning system 3 has an interior air intake port 22 for drawing in interior air, an exterior air intake port 23 for drawing in outside air, and an interior / exterior air switching door 30 that opens and closes the interior air intake port 22 and the exterior air intake port 23 to switch the intake mode between interior air mode and exterior air mode. Furthermore, the vehicle air conditioning system 3 has an air conditioner ECU 100 that controls the operation of the interior / exterior air switching door 30. The air conditioner ECU 100 switches the intake mode to the exterior air mode when performing ventilation.

[0115] According to this, by switching the intake mode to outside air mode when ventilating and blowing the drawn-in outside air into the vehicle interior space S, the time required for ventilation can be shortened compared to when ventilation is performed in internal air mode.

[0116] (12) In the above embodiment, the vehicle air conditioning system 3 has an air mix door 60 that adjusts the ratio of the airflow that passes through the heater core 50 from the air flowing out of the evaporator 14 to the airflow that bypasses the heater core 50. Furthermore, the vehicle air conditioning system 3 has an air conditioner ECU 100 that controls the operation of the air mix door 60. When ventilation is performed, the air conditioner ECU 100 controls the operation of the air mix door 60 so that all of the air flowing out of the evaporator 14 bypasses the heater core 50.

[0117] According to this, by bypassing the heater core 50 when the vehicle air conditioning system 3 performs ventilation, pressure loss when passing through the heater core 50 can be avoided. Therefore, power consumption when the vehicle air conditioning system 3 performs ventilation can be reduced.

[0118] (13) In the above embodiment, the vehicle air conditioning system 3 is configured to ventilate the vehicle interior space S by drawing in air and blowing the drawn-in air into the vehicle interior space S. The vehicle air conditioning system 3 includes an air conditioning case 20 that forms an air passage section 21, a refrigeration cycle device 10 having a refrigerant circuit 15, a compressor 11, a condenser 12, an expansion valve 13, and an evaporator 14, and a heater core 50 that heats the air that has passed through the evaporator 14 in the air passage section 21. Furthermore, the vehicle air conditioning system 3 includes an air conditioner ECU 100 that controls the operation of the compressor 11. The air conditioner ECU 100 stops the operation of the compressor 11 when ventilation is performed.

[0119] According to this, the power consumption of the vehicle's air conditioning system 3 when ventilating can be reduced.

[0120] Furthermore, by stopping the operation of the compressor 11 and preventing the refrigerant from circulating in the refrigerant circuit 15, it is possible to suppress the adhesion of condensation to the evaporator 14 that occurs when the evaporator 14 absorbs heat as the air flows through the air passage 21. As a result, when air passes through the air passage 21, carbon dioxide is adsorbed onto the condensation adhering to the evaporator 14, which suppresses the decrease in the carbon dioxide concentration in the air inside the vehicle when the vehicle air conditioning system 3 performs ventilation. Therefore, the calibration accuracy of the measured values ​​when the air conditioner ECU 100 calibrates the measured values ​​based on the ventilation characteristics can be further improved.

[0121] (14) In the above embodiment, the ventilation system 1 includes a camera 7 that detects the presence of an occupant P, who is a source of change that alters the carbon dioxide concentration in the vehicle interior space S, in the vehicle interior space S.

[0122] According to this, the camera 7 can detect the presence of an occupant P in the vehicle interior space S, and calibration is performed based on the detected value when occupant P is definitely not present.

[0123] (15) In the above embodiment, the vehicle air conditioning system 3 starts ventilation when the detected value detected by the carbon dioxide sensor 5 exceeds a predetermined upper limit, and stops ventilation when the detected value falls below a predetermined lower limit. The object detected by the carbon dioxide sensor 5 is carbon dioxide contained in the vehicle interior space S.

[0124] The reason for detecting the carbon dioxide concentration in the vehicle interior space S is explained below. If the carbon dioxide concentration in the vehicle interior space S is higher than that of the outside air, it may cause drowsiness in the occupant P, reduce the driver's concentration, and cause shortness of breath, thus reducing the comfort level of the occupant P. Therefore, by detecting the carbon dioxide concentration with a carbon dioxide sensor 5, and by having the vehicle's air conditioning system 3 ventilate so that ventilation starts when the detected value exceeds a predetermined upper limit and stops when it falls below a predetermined lower limit, it is possible to easily avoid a decrease in the comfort level of the occupant P.

[0125] (First modification of the first embodiment) In the first embodiment described above, an example was described in which the ventilation system 1 is equipped with a carbon dioxide sensor 5 for detecting carbon dioxide concentration. In that example, the vehicle air conditioning system 3 was described in which ventilation starts when the detected value of carbon dioxide concentration detected by the carbon dioxide sensor 5 exceeds an upper limit and ventilation stops when the detected value falls below a lower limit, but it is not limited to this. For example, the ventilation system 1 may be configured to be equipped with an odor sensor for detecting odor. The vehicle air conditioning system 3 may be configured to start ventilation when the detected value of odor detected by the odor sensor exceeds an upper limit and ventilation stops when the detected value falls below a lower limit.

[0126] The reason the ventilation system 1 is equipped with an odor sensor is that if something that causes odors occurs in the vehicle interior space S, the comfort level for the occupant P will decrease, and the odor may adhere to the seat ST, requiring time to remove. Factors that cause odors include, for example, the occupant P's body odor, vomit, excrement, and any food or drink that the occupant P has brought into the vehicle B.

[0127] In response to this, the vehicle's air conditioning system 3 can suppress the decrease in occupant P's comfort caused by odors by performing calibrated ventilation based on the odor detection value detected by the odor sensor.

[0128] (Second modification of the first embodiment) In the first embodiment described above, an example was described in which the air conditioner ECU 100 performs calibration after the vehicle air conditioning system 3 has finished ventilating the vehicle interior space S, but the invention is not limited to this. The air conditioner ECU 100 may also perform calibration while the vehicle air conditioning system 3 is ventilating the vehicle interior space S.

[0129] (Third modification of the first embodiment) In the first embodiment described above, an example was described in which the air conditioner ECU 100, which controls the operation of various components of the vehicle air conditioning system 3, performs calibration, but the invention is not limited to this. For example, the ventilation system 1 may be equipped with a control device for calibration separately from the air conditioner ECU 100, and this control device may perform the calibration. In this case, the control device may be composed of a computer including various types of memory such as a CPU, RAM, ROM, and flash memory.

[0130] (Fourth modification of the first embodiment) In the first embodiment described above, an example was described in which the air conditioner ECU 100 calibrates a reference value when the vehicle interior space S becomes equivalent to the outside air state and a measured value before the vehicle interior space S becomes equivalent to the outside air state, but the invention is not limited to this. For example, the air conditioner ECU 100 may be configured to calibrate only one of the reference value or the measured value.

[0131] (Fifth variation of the first embodiment) In the first embodiment described above, an example was described in which the air conditioner ECU 100 calibrates the reference value when it determines that the vehicle interior space S has reached a state equivalent to outside air when the fluctuation amount of carbon dioxide concentration falls within a predetermined stable range, but the invention is not limited to this. For example, the air conditioner ECU 100 may be configured to calibrate the reference value when it determines that the vehicle interior space S has reached a state equivalent to outside air after a sufficient amount of time has elapsed from the start of ventilation by the vehicle air conditioning system 3 until ventilation is completed.

[0132] (Sixth modification of the first embodiment) In the first embodiment described above, an example was given in which the air conditioner ECU 100 calibrates the measured values ​​based on ventilation characteristics, but the invention is not limited to this. For example, the air conditioner ECU 100 may calibrate the measured values ​​based on the correlation between a reference value and an outside air equivalent value. For example, if the reference value is larger than the outside air equivalent value by a predetermined amount, the air conditioner ECU 100 may calibrate the measured values ​​by assuming that the measured values ​​deviate from the actual values ​​by the same predetermined amount.

[0133] (Seventh variation of the first embodiment) In the first embodiment described above, an example was described in which the ventilation characteristics are set based on detected values ​​obtained when the vehicle air conditioning system 3 ventilates the vehicle interior space S when there are no occupants P in the vehicle interior space S. However, the invention is not limited to this. For example, the ventilation characteristics may be set based on detected values ​​obtained when the vehicle air conditioning system 3 ventilates the vehicle interior space S when there are occupants P in the vehicle interior space S.

[0134] (Eighth variation of the first embodiment) In the first embodiment described above, an example was described in which the vehicle air conditioning system 3 ventilates the vehicle interior space S under the same ventilation conditions as those used to obtain ventilation characteristics, but the embodiment is not limited to this. For example, in the above embodiment, the vehicle air conditioning system 3 may ventilate the vehicle interior space S under ventilation conditions different from those used to obtain ventilation characteristics.

[0135] (Ninth modification of the first embodiment) In the first embodiment described above, an example was described in which the vehicle air conditioning system 3 switches the air outlet mode to either the foot mode or the defroster mode when performing ventilation, but the invention is not limited to this. For example, the vehicle air conditioning system 3 may switch the air outlet mode to the face mode when performing ventilation.

[0136] (Ninth modification of the first embodiment) In the first embodiment described above, an example was described in which the air conditioner ECU 100 minimizes the airflow rate of the blower 40 when performing ventilation, but the invention is not limited to this. For example, the air conditioner ECU 100 may set the airflow rate of the blower 40 when performing ventilation to an airflow rate different from the minimum.

[0137] (Tenth variation of the first embodiment) In the first embodiment described above, an example was described in which the vehicle air conditioning system 3 directs the direction of the air blown into the vehicle interior space S by the blower 40 to be as close to constant as possible when performing ventilation, but the invention is not limited to this. For example, the air conditioner ECU 100 may not keep the amount of air blown by the blower 40 constant when performing ventilation, but may change it over time.

[0138] (The 11th variation of the first embodiment) In the first embodiment described above, an example was described in which the air conditioner ECU 100 switches the intake mode to the outside air mode when performing ventilation, but it is not limited to this. For example, the air conditioner ECU 100 may switch the intake mode to the inside air mode or the inside / outside air mode when performing ventilation.

[0139] (Twelfth variation of the first embodiment) In the first embodiment described above, an example was described in which the air conditioner ECU 100 controls the operation of the air mix door 60 so that all of the air flowing out from the evaporator 14 bypasses the heater core 50 when ventilation is performed, but the invention is not limited to this. For example, the air conditioner ECU 100 may control the operation of the air mix door 60 so that at least a portion of the air flowing out from the evaporator 14 passes through the heater core 50 when ventilation is performed.

[0140] (13th variation of the first embodiment) In the first embodiment described above, an example was described in which the air conditioner ECU 100 stops the operation of the compressor 11 when ventilation is performed, but the invention is not limited to this. For example, the air conditioner ECU 100 may operate the compressor 11 when ventilation is performed.

[0141] (14th variation of the first embodiment) In the first embodiment described above, an example was described in which the ventilation system 1 includes a camera 7 that detects the presence of an occupant P, who is a source of change that alters the carbon dioxide concentration in the vehicle interior space S. However, the system is not limited to this. For example, the ventilation system 1 may be configured without a means for detecting the presence of an occupant P, who is a source of change that alters the carbon dioxide concentration in the vehicle interior space S.

[0142] Alternatively, the ventilation system 1 may detect the presence of an occupant P, who is a source of change that alters the carbon dioxide concentration in the vehicle interior space S, using detection means different from the camera 7. For example, the ventilation system 1 may be configured such that a seat sensor is provided on the seat ST to detect the presence of an occupant P. Alternatively, the ventilation system 1 may be configured such that an open / close sensor is provided on the door to detect when an occupant P has boarded the vehicle B.

[0143] (15th variation of the first embodiment) In the first embodiment described above, an example was described in which the vehicle air conditioning system 3 starts ventilation when the detected value detected by the carbon dioxide sensor 5 exceeds a predetermined upper limit and stops ventilation when the detected value falls below a predetermined lower limit, but the system is not limited to this. For example, the vehicle air conditioning system 3 may be configured to start ventilation when the ventilation start button provided on the operation unit 9 is operated and to stop ventilation when the ventilation stop button provided on the operation unit 9 is operated.

[0144] (16th variation of the first embodiment) In the first embodiment described above, an example was given in which the ventilation system 1 is applied to an automobile, which is vehicle B. Here, the ventilation system 1 is applicable as long as ventilation is possible when the vehicle is stationary and there are no occupants P on board. For this reason, the automobile to which the ventilation system 1 is applied may be, for example, an electric vehicle or a plug-in hybrid vehicle. Furthermore, the ventilation system 1 is also applicable to vehicles other than automobiles, such as a train.

[0145] (17th variation of the first embodiment) In the first embodiment described above, an example was described in which the airflow adjustment unit 90 is configured as a louver whose orientation can be changed by the operation of the occupant P, but the invention is not limited to this. For example, the airflow adjustment unit 90 may be configured so that its orientation can be changed by an airflow actuator (not shown) controlled by the air conditioner ECU 100.

[0146] In this case, the air conditioner ECU 100 may set the air outlet mode of the vehicle air conditioning system 3 when it performs ventilation to face mode and control the position of the airflow adjustment unit 90 to a predetermined position to keep the direction of the air blown out from the face outlet 811 constant.

[0147] According to this, the amount of air blown out from the face outlet 811 per unit time can be kept constant. As a result, when the vehicle air conditioning system 3 performs ventilation, it becomes easier to keep the rate of change per unit time of the carbon dioxide concentration in the air in the vehicle interior space S, which changes due to ventilation, constant. Therefore, the calibration accuracy of the measurement values ​​when the air conditioner ECU 100 calibrates the measurement values ​​based on the ventilation characteristics can be further improved.

[0148] Furthermore, according to this, regardless of whether the vehicle air conditioning system 3 is set to face mode, foot mode, or defroster mode when performing ventilation, the amount of air blown into the vehicle interior space S per unit time can be kept constant. Therefore, the calibration accuracy for measured values ​​can be further improved, regardless of the type of blowing mode.

[0149] (Second Embodiment) Next, the second embodiment will be described with reference to Figures 7 to 10. In this embodiment, the ventilation system 1 is installed in room 300 and is used to ventilate the indoor space RS, which is the ventilation space to be ventilated, which is the difference from the first embodiment. In addition, the ventilation of the indoor space RS is replaced from the vehicle air conditioning unit 3 to the ventilation fan 200. Other than this, it is the same as the first embodiment. For this reason, in this embodiment, we will mainly describe the parts that differ from the first embodiment, and we may omit the description of parts that are the same as the first embodiment.

[0150] As shown in Figure 7, the ventilation system 1 of this embodiment includes a ventilation fan 200 that ventilates the indoor space RS of room 300, and an odor sensor 210 that detects the mass per unit volume of odor components contained in the air of the indoor space RS and outputs a detection value corresponding to the detected mass. Furthermore, the ventilation system 1 includes a human presence sensor 220 that detects whether or not a person F, which is a source of change that alters the mass per unit volume of odor components contained in the air of the indoor space RS, is present in the indoor space RS.

[0151] Here, room 300 is surrounded by walls and forms an indoor space RS, which is used by one or a relatively small number of people F, such as a toilet stall, a restaurant room, or a karaoke box (registered trademark).

[0152] Alternatively, room 300 may be an agricultural facility where animals are raised, a commercial facility such as a movie theater, a gymnasium, a sauna, a hot spring bath, or any other place where odor-causing substances may be present. In an agricultural facility, the odor-causing substance may be, for example, an animal, and ventilation system 1 is used to remove the odor emitted from the animal. In a hot spring bath, the odor-causing substance may be a hot spring, and ventilation system 1 is used to remove the hydrogen sulfide that causes the odor.

[0153] The ventilation fan 200 is configured to have, for example, an axial flow fan that draws in air from one side and blows it out to the other side. The ventilation fan 200 is installed, for example, on the first window 310, which is the air inlet of the indoor space RS, or on the second window 320, which is the air outlet of the indoor space RS. When the ventilation fan 200 is installed on the second window 320, it rotates to draw in air from the first window 310 and expel air from the second window 320. In this way, the indoor space RS is ventilated by the ventilation fan 200. The ventilation fan 200 is configured so that the airflow rate and direction of the blown air cannot be changed. In other words, the amount of air supplied by the ventilation fan 200 is constant when it is ventilating. Also, the direction of the airflow by the ventilation fan 200 is constant when it is ventilating. The ventilation fan 200 functions as a ventilation device.

[0154] The odor sensor 210 detects odor components contained in the air of the indoor space RS. The odor sensor 210 is an air sensor that detects the mass per unit volume of odor components contained in the air of the indoor space RS and outputs a detection value corresponding to the detected mass. For example, the odor sensor 210 outputs a higher detection value the larger the mass per unit volume of the odor component being detected. The odor sensor 210 outputs a detection value corresponding to the mass per unit volume of the detected odor component. In addition, as shown in Figures 7 and 8, the odor sensor 210 has an odor calibration unit 211.

[0155] The odor calibration unit 211 calibrates the detected value detected by the odor sensor 210. The odor calibration unit 211 includes a sensor processing unit 211a and a sensor storage unit 211b. The sensor storage unit 211b includes various types of memory such as RAM, ROM, and flash memory. RAM is a writable volatile storage medium. ROM is a non-writable non-volatile storage medium. Flash memory is a writable non-volatile storage medium. The sensor processing unit 211a, which corresponds to the CPU, executes a program (not shown) stored in the ROM and flash memory, and uses RAM as a working area during execution to realize various processes described later. RAM, ROM, and flash memory are all non-transitional physical storage media. The sensor processing unit 211a corresponds to the processing unit 101 described in the first embodiment, and the sensor storage unit 211b corresponds to the storage unit 102 described in the first embodiment.

[0156] Furthermore, as shown in Figure 7, the odor sensor 210 is installed within the indoor space RS where person F is present. For example, the odor sensor 210 is attached to the wall surrounding room 300. The odor sensor 210 detects odor components in the indoor space RS where person F is present if person F is present, and detects odor components in the indoor space RS where person F is not present if person F is not present.

[0157] For example, when the ventilation system 1 of this embodiment is used to ventilate a toilet stall, the odor sensor 210 detects ammonia components contained in the excrement.

[0158] The motion sensor 220 is a human presence detection device that detects whether or not a person F is present in the indoor space RS. In this embodiment, the motion sensor 220 acquires infrared radiation emitted from a person F that is within a predetermined detection range, and determines whether or not a person F is present within the detection range based on the amount of infrared radiation acquired. The motion sensor 220 may also be composed of ultrasonic waves or visible light.

[0159] Such a human presence sensor 220 functions as a source detection unit that detects whether or not a person F, who is a source of change that alters the mass per unit volume of odor components such as body odor and malodorous odors, is present in the indoor space RS. As shown in Figure 8, the human presence sensor 220 is connected to an odor calibration unit 211 and outputs judgment result information, which determines whether or not a person F is present within the detection range, to the odor calibration unit 211.

[0160] Next, the operation of the odor calibration unit 211 when calibrating the detected value of the odor sensor 210 will be explained with reference to Figures 9 and 10. It should be assumed that the ventilation fan 200 is constantly running and the indoor space RS is being ventilated by the ventilation fan 200 when the odor calibration unit 211 calibrates the detected value of the odor sensor 210.

[0161] As shown in Figure 9, first, in step S110, the odor calibration unit 211 determines whether or not a person F is present in the indoor space RS based on the information output from the human presence sensor 220.

[0162] If the odor calibration unit 211 determines in step S110 that a person F is present in the indoor space RS, it repeatedly executes step S110. That is, the odor calibration unit 211 repeatedly executes step S110 until it determines in step S110 that a person F is not present in the indoor space RS.

[0163] Then, as shown in Figure 10, when there is no person F in the indoor space RS, the odor calibration unit 211 does not determine in step S110 that there is a person F in the indoor space RS. If it is not determined in step S110 that there is a person F in the indoor space RS, in step S120, the odor calibration unit 211 stores the detected values ​​of the odor components transmitted from the odor sensor 210 in the sensor storage unit 211b. By repeatedly executing step S120, the odor calibration unit 211 stores the detected values ​​of the odor components from the odor sensor 210, which decrease over time, for each control cycle.

[0164] Then, in step S130, the odor calibration unit 211 determines whether the fluctuation in the detected value of the odor component detected by the odor sensor 210 has moved within a predetermined stable range due to the ventilation performed by the ventilation fan 200.

[0165] The odor calibration unit 211 repeatedly executes step S120 until it determines that the fluctuation in the detected value of the odor component detected by the odor sensor 210 has moved within a predetermined stable range, and repeatedly stores the detected value of the odor component detected by the odor sensor 210. When it determines that the fluctuation in the detected value of the odor component has moved within a predetermined stable range, the odor calibration unit 211 executes step S140.

[0166] In step S140, the odor calibration unit 211 calibrates the stored reference value to approach the value equivalent to the outside air. In other words, when the vehicle interior space S reaches an outside air equivalent state, the odor calibration unit 211 calibrates the reference value to approach the value equivalent to the outside air. Here, the reference value in this embodiment is the detected value when the interior space RS reaches an outside air equivalent state due to ventilation by the ventilation fan 200, and the fluctuation of the detected value of the odor component detected by the odor sensor 210 has moved within a predetermined stable range.

[0167] Then, in step S150, the odor calibration unit 211 calibrates the measured values ​​based on the ventilation characteristics. The ventilation characteristics in this embodiment are set based on the detected values ​​obtained when the ventilation fan 200 ventilates the indoor space RS when no people F are present in the indoor space RS. The ventilation characteristics can also be obtained by an experiment to determine the detected values ​​detected by the odor sensor 210 in a normal state when the indoor space RS is ventilated by the ventilation fan 200. The ventilation characteristics are pre-set in the sensor storage unit 211b. The odor calibration unit 211 in this embodiment functions as a sensor calibration unit that performs calibration on the detected values ​​output by the odor sensor 210.

[0168] As described above, the ventilation system 1 of this embodiment includes a ventilation fan 200 for ventilating the indoor space RS, and an odor sensor 210 for detecting odor components contained in the air of the indoor space RS and outputting an output value corresponding to the detected odor components. The ventilation system 1 also includes an odor calibration unit 211 for calibrating the detected value output by the odor sensor 210.

[0169] The odor calibration unit 211 performs calibration based on the detected values ​​of the odor sensor 210 while the ventilation fan 200 is ventilating the indoor space RS in the absence of a person F.

[0170] According to this, the odor calibration unit 211 performs calibration based on the detected value when there is no person F present that alters the odor components of the indoor space RS, thus suppressing fluctuations in odor components caused by person F during calibration. In other words, the odor calibration unit 211 can perform calibration while suppressing the influence of disturbances that alter the odor components detected by the odor sensor 210. Therefore, the calibration accuracy of the odor sensor 210 can be improved.

[0171] (Other embodiments) While representative embodiments of this disclosure have been described above, this disclosure is not limited to the embodiments described above and can be modified in various ways, for example, as follows.

[0172] In the embodiments described above, an example was given in which the ventilation system 1 is used to ventilate carbon dioxide concentration, body odor from people, etc., but it is not limited to this. For example, the ventilation system 1 may be used to ventilate ethylene gas generated by an ethylene gas generator. In this case, a sensor capable of detecting ethylene gas may be used as the air sensor.

[0173] In the embodiments described above, it goes without saying that the elements constituting the embodiments are not necessarily essential, except in cases where they are explicitly stated to be essential or where they are clearly considered essential in principle.

[0174] In the embodiments described above, if numerical values ​​such as the number, numerical values, quantities, or ranges of the components of the embodiment are mentioned, the embodiment is not limited to those specific numbers unless explicitly stated as particularly essential or clearly limited to a specific number in principle.

[0175] In the embodiments described above, when referring to the shape, positional relationships, etc. of the components, the definition is not limited to those shapes, positional relationships, etc., unless otherwise specifically stated or when the definition is fundamentally limited to a particular shape, positional relationship, etc.

[0176] The control unit and its method of this disclosure may be implemented in a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. The control unit and its method of this disclosure may be implemented in a dedicated computer provided by configuring a processor by one or more dedicated hardware logic circuits. The control unit and its method of this disclosure may be implemented in one or more dedicated computers configured by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. The computer program may also be stored as instructions executed by the computer on a computer-readable non-transitional tangible recording medium.

[0177] (Features of the present invention) [Claim 1] It is a ventilation system, A ventilation device (3, 200) that ventilates the ventilation space to be ventilated, An air sensor (5, 211) detects the physical quantity of the object to be detected contained in the air of the ventilation space and outputs a detected value corresponding to the detected physical quantity, The system includes a sensor calibration unit (100, 211) that performs calibration on the detected value output by the air sensor, The sensor calibration unit is a ventilation system that calibrates the detected value detected by the air sensor in the ventilation space where there are no change sources (P, F) that change the physical quantity of the object to be detected, at least one of the following timings: while the ventilation device is ventilating or after ventilation is completed. [Claim 2] The ventilation system according to claim 1, wherein the sensor calibration unit calibrates at least one of the following values: a reference value which is the detected value detected by the air sensor when the ventilation space becomes equivalent to the outside air space, which is the space outside the ventilation space, as a result of the ventilation device performing ventilation of the ventilation space; and a measured value which is the detected value detected by the air sensor after the ventilation device has started ventilation but before the ventilation space reaches the equivalent outside air state. [Claim 3] The ventilation system according to claim 2, wherein the sensor calibration unit calibrates the reference value to approach an outside air reference value which is a value corresponding to the physical quantity of the object to be detected contained in the outside air space. [Claim 4] The aforementioned state equivalent to outside air is a state in which the fluctuation of the detected value detected by the air sensor falls within a predetermined stable range. The ventilation system according to claim 3, wherein the sensor calibration unit calibrates the reference value when the ventilation space reaches a state equivalent to the outside air. [Claim 5] The ventilation system according to any one of claims 2 to 4, wherein the sensor calibration unit calibrates the measured value based on ventilation characteristics that show a correlation between the detected value detected by the air sensor in a normal state and the ventilation execution time when the ventilation device ventilates the ventilation space. [Claim 6] The ventilation system according to claim 5, wherein the ventilation characteristics are set based on the detected value obtained when the ventilation device ventilates the ventilation space in a state where the change source is absent. [Claim 7] The ventilation system according to claim 5 or 6, wherein the ventilation device ventilates the ventilation space under the same ventilation conditions as those used to obtain the ventilation characteristics. [Claim 8] The ventilation device includes a blower (40, 200) that generates an airflow that flows from an air inlet (811, 821, 831) for introducing air into the ventilation space toward an air outlet (320) for discharging air from the ventilation space, thereby supplying air to the ventilation space. The ventilation system according to any one of claims 5 to 7, wherein the amount of air blown by the blower when performing ventilation is constant. [Claim 9] The blower is equipped with a blower control unit (100) that adjusts the amount of air blown by the blower, The ventilation system according to claim 8, wherein the airflow control unit minimizes the amount of air blown by the blower when performing ventilation. [Claim 10] The ventilation system according to claim 8 or 9, wherein the ventilation device brings the direction of the air blown into the ventilation space closer to a constant when performing ventilation. [Claim 11] The ventilation device is a vehicle air conditioning system installed in a vehicle that can ventilate the vehicle interior space by drawing in air and blowing the drawn-in air into the vehicle interior space, which is the ventilation space. A face opening (24) that directs the inhaled air towards the occupant's upper body, A foot opening (25) that directs the inhaled air to the lower body of the occupant, A defroster opening (26) that guides the inhaled air to the windshield provided in the vehicle interior space, The vehicle has a blowing mode switching unit (71, 72, 73) that switches the blowing mode, which blows air from any of the face opening, the foot opening, and the defroster opening, to a face mode that increases the airflow volume of air blown into the vehicle interior space by suppressing the air passing through the defroster opening and the foot opening; a foot mode that increases the airflow volume of air blown into the vehicle interior space by suppressing the air passing through the face opening and the defroster opening; and a defroster mode that increases the airflow volume of air blown into the vehicle interior space by suppressing the air passing through the face opening and the foot opening. It includes a blow-out mode control unit (100) that controls the operation of the blow-out mode switching unit, The ventilation system according to any one of claims 5 to 10, wherein the blowing mode control unit switches the blowing mode to either the foot mode or the defroster mode when performing ventilation. [Claim 12] The ventilation device is a vehicle air conditioning system installed in a vehicle that can ventilate the vehicle interior space by drawing in air and blowing the drawn-in air into the vehicle interior space, which is the ventilation space. An air conditioning case (20) that forms an air passage section (21) through which air blown into the vehicle interior flows, A refrigeration cycle device (10) having a refrigerant circuit (15) through which the refrigerant flows, a compressor (11) that compresses and discharges the refrigerant to circulate it in the refrigerant circuit, a condenser (12) that condenses the refrigerant discharged from the compressor, an expansion valve (13) that reduces the pressure of the refrigerant flowing out of the condenser, and an evaporator (14) located inside the air conditioning case that evaporates the refrigerant reduced in pressure by the expansion valve and absorbs heat from the air flowing through the air passage, A heating unit (50) is located inside the air conditioning case and heats the air that has passed through the evaporator in the air passage section, The system includes a compression control unit (100) that controls the operation of the compressor, The ventilation system according to any one of claims 5 to 11, wherein the compression control unit stops the operation of the compressor when ventilation is performed. [Claim 13] The aforementioned ventilation device is An air mix door (60) is placed inside the air conditioning case and adjusts the ratio between the airflow rate of the air that passes through the heating section and the airflow rate of the air that bypasses the heating section, The system includes an air mix door control unit (100) that controls the operation of the air mix door, The ventilation system according to claim 12, wherein the air mix door control unit controls the operation of the air mix door so that all of the air flowing out of the evaporator bypasses the heating unit when ventilation is performed. [Claim 14] The ventilation device is a vehicle air conditioning system installed in a vehicle that can ventilate the vehicle interior space by drawing in air and blowing the drawn-in air into the vehicle interior space, which is the ventilation space. The interior air intake (22) draws in the interior air, which is the air inside the vehicle interior, The aforementioned outside air intake (23) draws in outside air, which is the air outside the vehicle compartment, An intake mode switching unit (30) switches between an intake mode, which is the open / closed state of the intake port and the outside air port, and an intake mode, which is the state in which the intake port and the outside air port are closed, so that the air blown into the vehicle interior is the intake mode, and an intake mode, which is the state in which the intake port is closed and the outside air port is open, so that the air blown into the vehicle interior is the outside mode, by opening and closing the intake port and the outside air port. It includes a suction mode control unit (100) that controls the operation of the suction mode switching unit, The ventilation system according to any one of claims 5 to 13, wherein the intake mode control unit switches the intake mode to the outside air mode when performing ventilation. [Claim 15] The ventilation space is equipped with a source detection unit (7, 220) that detects the presence of the change source, The ventilation system according to any one of claims 11 to 14, wherein the source detection unit includes one of a camera for detecting an occupant riding in the vehicle, an occupancy sensor for detecting an occupant sitting in a seat of the vehicle, and an opening / closing sensor for detecting the opening and closing of a door of the vehicle. [Claim 16] The ventilation device starts ventilation when the detected value exceeds a predetermined upper limit, and stops ventilation when the detected value falls below a predetermined lower limit. The ventilation system according to any one of claims 11 to 15, wherein the object to be detected includes one of carbon dioxide, body odor, or malodorous odor contained in the air inside the vehicle. [Explanation of symbols]

[0178] 3,200 Ventilation system 5,211 Air Sensor 100, 211 Sensor Calibration Section Source of P and F change

Claims

1. It is a ventilation system, A ventilation device (3,200) that ventilates the ventilation space to be ventilated, An air sensor (5, 211) detects the physical quantity of the object to be detected contained in the air of the ventilation space and outputs a detected value corresponding to the detected physical quantity, The system includes a sensor calibration unit (100, 211) that performs calibration on the detected value output by the air sensor, The sensor calibration unit calibrates at least one of the following values: a reference value which is the detected value detected by the air sensor in the ventilation space when there are no change sources (P, F) that change the physical quantity of the object to be detected, at least one of the detected values ​​which is the detected value detected by the air sensor when the ventilation space becomes an outside air equivalent state, which is the space outside the ventilation space, as a result of the ventilation device performing ventilation of the ventilation space; and a measured value which is the detected value detected by the air sensor after the ventilation device starts ventilation but before the ventilation space becomes an outside air equivalent state. The ventilation system also calibrates the measured value based on ventilation characteristics which show the correlation between the detected value detected by the air sensor in a normal state and the ventilation execution time when the ventilation device ventilates the ventilation space.

2. The ventilation system according to claim 1, wherein the sensor calibration unit calibrates the reference value to approach an outside air reference value which is a value corresponding to the physical quantity of the object to be detected contained in the outside air space.

3. The aforementioned state equivalent to outside air is a state in which the fluctuation of the detected value detected by the air sensor falls within a predetermined stable range. The ventilation system according to claim 2, wherein the sensor calibration unit calibrates the reference value when the ventilation space reaches a state equivalent to the outside air.

4. The ventilation system according to claim 1, wherein the ventilation characteristics are set based on the detected value obtained when the ventilation device ventilates the ventilation space in a state where the change source is absent.

5. The ventilation system according to claim 1, wherein the ventilation device ventilates the ventilation space under the same ventilation conditions as those used to obtain the ventilation characteristics.

6. The ventilation device includes a blower (40, 200) that generates an airflow that flows from an air inlet (811, 821, 831) for introducing air into the ventilation space toward an air outlet (320) for discharging air from the ventilation space, thereby supplying air to the ventilation space. The ventilation system according to claim 1, wherein the amount of air blown by the blower when performing ventilation is constant.

7. The blower is equipped with a blower control unit (100) that adjusts the amount of air blown by the blower, The ventilation system according to claim 6, wherein the airflow control unit minimizes the amount of air blown by the blower when performing ventilation.

8. The ventilation system according to claim 6, wherein the ventilation device brings the direction of the air blown into the ventilation space closer to a constant when ventilation is performed.

9. The ventilation device is a vehicle air conditioning system installed in a vehicle that can ventilate the vehicle interior space by drawing in air and blowing the drawn-in air into the vehicle interior space, which is the ventilation space. A face opening (24) that directs the inhaled air towards the occupant's upper body, A foot opening (25) that guides the inhaled air to the lower body of the occupant, A defroster opening (26) that guides the inhaled air to the windshield provided in the vehicle interior space, The vehicle has a blowing mode switching unit (71, 72, 73) that switches the blowing mode, which blows air from any of the face opening, the foot opening, and the defroster opening, to a face mode that increases the airflow volume of air blown into the vehicle interior space by suppressing the air passing through the defroster opening and the foot opening; a foot mode that increases the airflow volume of air blown into the vehicle interior space by suppressing the air passing through the face opening and the defroster opening; and a defroster mode that increases the airflow volume of air blown into the vehicle interior space by suppressing the air passing through the face opening and the foot opening. It includes a blow-out mode control unit (100) that controls the operation of the blow-out mode switching unit, The ventilation system according to claim 1, wherein the blowing mode control unit switches the blowing mode to either the foot mode or the defroster mode when performing ventilation.

10. The ventilation device is a vehicle air conditioning system installed in a vehicle that can ventilate the vehicle interior space by drawing in air and blowing the drawn-in air into the vehicle interior space, which is the ventilation space. An air conditioning case (20) that forms an air passage section (21) through which air blown into the vehicle interior flows, A refrigeration cycle device (10) having a refrigerant circuit (15) through which a refrigerant flows, a compressor (11) that compresses and discharges the refrigerant to circulate it in the refrigerant circuit, a condenser (12) that condenses the refrigerant discharged from the compressor, an expansion valve (13) that reduces the pressure of the refrigerant flowing out of the condenser, and an evaporator (14) located inside the air conditioning case that evaporates the refrigerant reduced in pressure by the expansion valve and absorbs heat from the air flowing through the air passage, A heating unit (50) is located inside the air conditioning case and heats the air that has passed through the evaporator in the air passage section, The system includes a compression control unit (100) that controls the operation of the compressor, The ventilation system according to claim 1, wherein the compression control unit stops the operation of the compressor when ventilation is performed.

11. The aforementioned ventilation device is An air mix door (60) is placed inside the air conditioning case and adjusts the ratio between the airflow rate of the air that passes through the heating section and the airflow rate of the air that bypasses the heating section, The system includes an air mix door control unit (100) that controls the operation of the air mix door, The ventilation system according to claim 10, wherein the air mix door control unit controls the operation of the air mix door so that all of the air flowing out of the evaporator bypasses the heating unit when ventilation is performed.

12. The ventilation device is a vehicle air conditioning system installed in a vehicle that can ventilate the vehicle interior space by drawing in air and blowing the drawn-in air into the vehicle interior space, which is the ventilation space. The interior air intake (22) draws in the interior air, which is the air inside the vehicle interior space, An outside air intake (23) that draws in outside air, which is the air from outside the vehicle interior, An intake mode switching unit (30) switches between an intake mode, which is the open / closed state of the intake port and the outside air port, and an outside air mode, which is the state in which the intake port and the outside air port are closed, so that the air blown into the vehicle interior is the intake port, and an outside air mode, which is the state in which the intake port is closed and the outside air port is open, so that the air blown into the vehicle interior is the outside air, by opening and closing the intake port and the outside air port. It includes a suction mode control unit (100) that controls the operation of the suction mode switching unit, The ventilation system according to claim 1, wherein the intake mode control unit switches the intake mode to the outside air mode when performing ventilation.

13. The ventilation space is equipped with a source detection unit (7, 220) that detects the presence of the change source, The ventilation system according to claim 9, wherein the source detection unit includes one of the following: a camera for detecting an occupant riding in the vehicle; an occupancy sensor for detecting an occupant sitting in a seat in the vehicle; and an opening / closing sensor for detecting the opening and closing of a door in the vehicle.

14. The ventilation device starts ventilation when the detected value exceeds a predetermined upper limit, and stops ventilation when the detected value falls below a predetermined lower limit. The ventilation system according to claim 9, wherein the object to be detected includes one of carbon dioxide, body odor, or malodorous odor contained in the air inside the vehicle.

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