JP2006008002A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of suppressing raising of a concentration of carbon dioxide in a cabin caused by breathing out of an occupant and ensuring comfortable air-conditioning effect in the cabin. <P>SOLUTION: The air conditioner for the vehicle is provided with an introduction ratio setting means 16 for setting an internal air introduction ratio; a gas concentration detection means 14 for detecting a concentration of carbon dioxide in the cabin; an allowance value calculation means 17 for calculating an upper limit value of the internal air introduction ratio based on the detection value of the concentration of carbon dioxide; a comparison means 18 for comparing the set value of the internal air introduction ratio with the upper limit value; and a control means 19 for controlling an intake door 5. Thereby, the concentration of carbon dioxide in the cabin is detected to calculate the upper limit value of the internal air introduction ratio and it is compared with the set value of the internal air introduction ratio. As a result, when the set value of the internal air introduction ratio is larger than the upper limit value, the intake door 5 is controlled to enhance an external air introduction ratio and air-conditioned air containing external air of a sufficient amount on safety is blown out into the cabin. Then, when the concentration of carbon dioxide in the cabin exceeds the upper limit value, a compressor 20 of an outside coolant circuit 7 is stopped. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

TECHNICAL FIELD The present invention relates to a vehicle air conditioner that introduces air from the outside of a vehicle interior to adjust temperature and supplies conditioned air to the interior of the vehicle interior, and in particular, heat exchange that performs heat exchange using carbon dioxide (CO ₂ ) as a refrigerant. The present invention relates to a vehicle air conditioner equipped with a vessel.

In general, there is a system that uses carbon dioxide (CO ₂ ) as a refrigerant for an air conditioner in order to prevent environmental pollution in place of a chlorofluorocarbon gas. When such an air conditioner is installed in a vehicle and carbon dioxide used as a refrigerant leaks into the passenger compartment, this passenger compartment is a relatively narrow space, which may cause inconvenience for passengers in the passenger compartment, For example, since there is a problem that an occupant sucks carbon dioxide and becomes sleepy, a means for detecting the carbon dioxide concentration in the passenger compartment has been proposed (see, for example, Patent Document 1).

In this conventional technology, when the carbon dioxide concentration in the passenger compartment reaches a specified value, the passenger is warned, the outside air is forcibly introduced, the compressor of the air conditioner is stopped, and the vehicle is Measures such as increasing the volume of air introduced into the room were taken.
Re-published patent WO00 / 59748 (pages 7-9, FIG. 1)

  By the way, in the above-described prior art, when the carbon dioxide concentration in the passenger compartment reaches a predetermined specified value, is the state of the air inlet of the air conditioner introducing air (inside air) in the passenger compartment? Or, the meaning of the detection result of the carbon dioxide concentration differs depending on whether air from outside the passenger compartment (outside air) is introduced, that is, when outside air is introduced, refrigerant leakage from the air conditioner is estimated. On the other hand, in the case of inside air introduction, the carbon dioxide concentration in the passenger compartment may increase due to the breathing of the occupant.In particular, in the case of a small car or a minivan on which a large number of people are boarding, The upward trend is remarkable.

  Also, when the carbon dioxide concentration in the passenger compartment increases and reaches the specified value, the outside air is forcibly introduced immediately or the compressor of the air conditioner is stopped to increase the amount of air introduced into the passenger compartment. When countermeasures are taken, the air volume and temperature of the air-conditioning air are drastically changed against the passenger's intention, and there is a problem that the comfortable air-conditioning effect in the passenger compartment is impaired.

  The present invention has been made in consideration of the above-described prior art, and an object of the present invention is to suppress an increase in the carbon dioxide concentration in the passenger compartment due to the breathing of the occupant and a comfortable air conditioning effect in the passenger compartment. It is providing the vehicle air conditioner which can ensure.

  In order to achieve the above object, the invention according to claim 1 is characterized in that an outside air introduction port and an inside air introduction port communicating with the outside and the inside of the passenger compartment, respectively, on the most upstream side of the air conditioning duct disposed inside the passenger compartment. An intake door that opens and closes the outside air introduction port and the inside air introduction port and adjusts the introduction rate of the outside air and the inside air is provided, and the outside air or the inside air is sucked and blown downstream from the intake door. A vehicle in which a blower and a heat exchanger that performs heat exchange using a refrigerant circulating in an external refrigerant circuit are arranged, and air-conditioned air is blown out from the air-conditioning duct to the inside of the passenger compartment through a plurality of outlets. Based on the detected value of the carbon dioxide concentration, the introduction rate setting means for setting the inside air introduction rate, the gas concentration detecting means for detecting the carbon dioxide concentration present in the interior of the passenger compartment An allowable value calculating means for calculating an upper limit value of the inside air introduction rate, and a case where the set value of the inside air introduction rate is compared with the upper limit value of the inside air introduction rate and the set value of the inside air introduction rate is larger than the upper limit value And a control means for controlling the intake door so that the inside air introduction rate decreases according to the detection signal.

  In the invention according to claim 1 configured as described above, the gas concentration detecting means detects the carbon dioxide concentration present in the passenger compartment, and based on the detected value of the carbon dioxide concentration, the allowable value calculating means detects the inside air introduction rate. Is calculated, and the setting value of the inside air introduction rate is compared with the upper limit value by the comparison means. As a result, when the setting value of the inside air introduction rate is less than or equal to the upper limit value, the state is maintained as it is. On the other hand, when the setting value of the inside air introduction rate is larger than the upper limit value, the intake is reduced so that the inside air introduction rate is reduced by the control means. Control the door to increase the outside air introduction rate. As a result, the air volume of the outside air increases, so that the air-conditioned air containing the outside air having a sufficient air volume for safety is blown out from the air-conditioning duct into the vehicle interior. As a result, an increase in the carbon dioxide concentration in the passenger compartment due to the breathing of the occupant can be suppressed. And since the air volume and temperature of air-conditioning wind do not change abruptly against the passenger's intention, it is possible to ensure a comfortable air-conditioning effect in the passenger compartment.

  In order to achieve the above object, the invention according to claim 2 is characterized in that an outside air introduction port and an inside air introduction communicating with the outside and inside of the passenger compartment are respectively provided on the uppermost stream side of the air conditioning duct disposed inside the passenger compartment. And an intake door that opens and closes the outside air introduction port and the inside air introduction port and adjusts the introduction rate of the outside air and the inside air, and sucks the outside air or the inside air to the downstream side of the intake door to the downstream side. A blower that blows air and a heat exchanger that performs heat exchange using a refrigerant circulating in the external refrigerant circuit are arranged so that the conditioned air is blown from the air-conditioning duct to the interior of the vehicle compartment through a plurality of outlets. An air conditioner for a vehicle, the air volume setting means for setting the air volume passing through the air conditioning duct, the gas concentration detection means for detecting the carbon dioxide concentration present inside the passenger compartment, and the carbon dioxide concentration An allowable value calculating means for calculating a lower limit value of the minimum air volume required for safety based on the detected value of the air flow, comparing the set value of the air volume with the lower limit value of the minimum air volume, and setting the air volume from the lower limit value Comparing means for outputting a detection signal when the value is small and control means for controlling the blower so as to increase the amount of air passing through the air conditioning duct according to the detection signal are provided.

  In the invention according to claim 2 configured as described above, the gas concentration detecting means detects the carbon dioxide concentration existing inside the passenger compartment, and based on the detected value of the carbon dioxide concentration, the allowable value calculating means detects the minimum air volume. The lower limit value is calculated, and the setting value of the air volume is compared with the lower limit value of the minimum air volume by the comparison unit. As a result, if the detected value of the air volume is equal to or greater than the lower limit value of the minimum air volume, the state is kept as it is. On the other hand, if the set value of the air volume is smaller than the lower limit value of the minimum air volume, Control the blower to increase up to. Along with this, air-conditioning air having a sufficient air volume for safety is blown out from the air-conditioning duct into the passenger compartment. As a result, an increase in the carbon dioxide concentration in the passenger compartment due to the breathing of the occupant can be suppressed. And since the increase in the air volume of the conditioned air blown into the passenger compartment is kept to the minimum necessary, it is relatively small, and the air volume and temperature of the air conditioned air do not change drastically against the passenger's intention. A comfortable air-conditioning effect in the passenger compartment can be ensured.

  In order to achieve the above object, the invention according to claim 3 is characterized in that an outside air introduction port and an inside air introduction communicating with the outside and the inside of the passenger compartment are provided on the uppermost stream side of the air conditioning duct disposed inside the passenger compartment. And an intake door that opens and closes the outside air introduction port and the inside air introduction port and adjusts the introduction rate of the outside air and the inside air, and sucks the outside air or the inside air to the downstream side of the intake door to the downstream side. A blower that blows air and a heat exchanger that performs heat exchange using a refrigerant circulating in the external refrigerant circuit are arranged so that the conditioned air is blown from the air-conditioning duct to the interior of the vehicle compartment through a plurality of outlets. An air conditioner for a vehicle, wherein an introduction rate setting means for setting the inside air introduction rate, an air volume setting means for setting an air volume passing through the air conditioning duct, and a carbon dioxide concentration present in the interior of the passenger compartment. Inspection Gas concentration introduction rate detecting means, allowable value calculating means for calculating an upper limit value of the inside air introduction rate and a lower limit value of the minimum air volume required for safety based on the detected value of the carbon dioxide concentration, When the set value of the inside air introduction rate is compared with the upper limit value of the inside air introduction rate, the first detection signal is output when the set value of the inside air introduction rate is larger than the upper limit value, and the set value of the air volume is set Comparison means for outputting a second detection signal when the set value of the air volume is smaller than the lower limit value of the minimum air volume, and the inside air introduction rate according to the first detection signal, etc. The intake door is controlled so as to decrease, and control means for controlling the blower so as to increase the amount of air passing through the air-conditioning duct according to the second detection signal is provided.

  In the invention of claim 3 configured as described above, similarly to the inventions of claims 2 and 3 described above, an increase in the carbon dioxide concentration in the passenger compartment due to the breathing of the occupant can be suppressed, and contrary to the intention of the occupant. Since the air volume and temperature of the conditioned air do not change drastically, a comfortable air conditioning effect in the passenger compartment can be ensured.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, when the detected value of the carbon dioxide concentration exceeds a preset upper limit for safety, the external refrigerant circuit The compressor is configured to stop.

  Thus, in the invention described in claim 4, when the carbon dioxide concentration in the passenger compartment exceeds the upper limit set in advance for safety even though the increase in the carbon dioxide concentration in the passenger compartment is suppressed, the external refrigerant circuit Since the compressor is stopped, the external refrigerant circuit can be protected and a dangerous state of adversely affecting passengers in the passenger compartment can be prevented.

  According to the present invention, it is possible to suppress an increase in the carbon dioxide concentration in the passenger compartment due to the breathing of the occupant and to ensure a comfortable air conditioning effect in the passenger compartment. Therefore, there is an effect that a vehicle air conditioner that can provide a comfortable and safe air-conditioning environment for passengers using carbon dioxide as a refrigerant can be obtained.

  Hereinafter, details of a vehicle air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
A first embodiment of the present invention is shown in FIGS.

  The vehicle air conditioner 1 according to the first embodiment shown in FIG. 1 includes an air conditioning duct 2 disposed inside a passenger compartment (not shown). On the most upstream side of the air conditioning duct 2, an outside air introduction port 3 that communicates with the outside of the passenger compartment and introduces outside air, an inside air introduction port 4 that communicates with the inside of the passenger compartment and introduces inside air, and these outside airs. An intake door 5 is provided that opens and closes the introduction port 3 and the inside air introduction port 4 and adjusts the introduction rate of outside air and inside air. On the downstream side of the intake door 5, heat exchange is performed using a blower 6 that sucks outside air or inside air that has passed through the intake door 5 and blows it downstream, and refrigerant (carbon dioxide) that circulates in the external refrigerant circuit 7. A heat exchanger 8 to be performed, an air mix door 9 that divides the air that has passed through the heat exchanger 8, and a heat core 10 that can heat the air that is diverted by the air mix door 9 using an engine (not shown) as a heat source are arranged. Yes. The conditioned air whose temperature has been adjusted by the heat exchanger 8 and the heat core 10 is blown out from the air conditioning duct 2 to the interior of the vehicle compartment via the differential air outlet 11, the vent air outlet 12 and the foot air outlet 13. These air outlets 11 to 13 are provided with air outlet doors 11a to 13a that can be opened and closed, respectively.

  The intake door 5 operates in accordance with a control signal output from the control means 19 of the controller 15 and closes the inside air introduction port 4 from a position (shown by a solid line in FIG. 1) that closes the outside air introduction port 3 (FIG. 1). The air introduced through the outside air introduction port 3, that is, the introduction rate of the outside air, and the air introduced through the inside air introduction port 4, that is, the introduction rate of the inside air. To be adjusted. The external refrigerant circuit 7 includes a compressor 20, a condenser 21, and an expansion valve 22 that are arranged in an engine chamber (not shown). By rotating the air mix door 9 within a range from a position for closing the passage on the heat core 10 side (position indicated by a solid line in FIG. 1) to a position for closing the passage on the bypass side (position indicated by a broken line in FIG. 1), The ratio of the air heated by the heat core 10 is adjusted. After the air passing through the air conditioning duct 2 is cooled by the heat exchanger 8, it is diverted by the air mix door 9, and the air heated by the heat core 10 and the bypassed air are merged again so that the heated air is supplied at a predetermined rate. Since they are mixed, conditioned air having a desired temperature can be obtained.

  And the vehicle air conditioner 1 of this embodiment connects the gas concentration detection means 14 which detects the carbon dioxide concentration which exists in a vehicle interior, this gas concentration detection means 14, the intake door 5, and the air blower 6 etc. The controller 15 is provided. The gas concentration detection means 14 can be arranged at any position in the passenger compartment. However, since carbon dioxide is relatively heavy, it is desirable to arrange it at the feet of the passenger.

  The controller 15 has an introduction rate setting means 16 for setting the inside air introduction rate of the air introduced into the air conditioning duct 2 and an upper limit of the inside air introduction rate based on the detected value of the carbon dioxide concentration detected by the gas concentration detection means 14. The allowable value calculating means 17 for calculating the value and the setting value of the inside air introduction rate set by the introduction rate setting means 16 are compared with the upper limit value, and the comparison means 18 for outputting a detection signal when the detected value is larger than the upper limit value. And a control means 19 for controlling the intake door 5 so as to reduce the inside air introduction rate in accordance with the detection signal.

Data relating to the upper limit value R of the inside air introduction rate indicated by the solid line L1 in FIG. 2 is stored in advance in the controller 15, and the upper limit value R of the inside air introduction rate is the detected value d of the carbon dioxide concentration (CO ₂ concentration). It is set within a range of 0.5 to 1.5%. When the detected value d of the carbon dioxide concentration is 0.5% or less, the upper limit value R of the inside air introduction rate is 100%, whereas when the detected value d of the carbon dioxide concentration is 1.5%, the inside air is introduced. The upper limit value R of the rate is 0%. When the detection value d is between 0.5 and 1.5%, the upper limit value R of the inside air introduction rate decreases in inverse proportion to the increase in the detection value d of the carbon dioxide concentration, as indicated by the solid line L1 in FIG. It has become. Further, when the detected value d of the carbon dioxide concentration exceeds an upper limit value 1.5% set in advance for safety, a stop signal for stopping the compressor 20 of the external refrigerant circuit 7 is output from the control means 19.

In the first embodiment, the carbon dioxide concentration in the passenger compartment is monitored according to the processing procedure shown in FIG. That is, first, as step S1, the gas concentration detecting means 14 detects the carbon dioxide concentration existing inside the passenger compartment, and based on the detected value d of the carbon dioxide concentration, the allowable value calculating means 17 detects the inside air introduction rate of FIG. An upper limit value (allowable ambient air introduction rate) R of the inside air introduction rate is calculated using the data, and the setting value (current inside air introduction rate) Ra of the inside air introduction rate Ra is set as the upper limit value R of the inside air introduction rate by the comparison means 18 in step S2. Compare with As a result, when the setting value Ra of the inside air introduction rate is equal to or less than the upper limit value R of the inside air introduction rate, the state is maintained as it is. On the other hand, as shown in FIG. 2, when the set value Ra of the inside air introduction rate is larger than the upper limit value R of the inside air introduction rate, a detection signal is output from the comparison means 18, so that the control means based on this detection signal as step S3 The intake door 5 is controlled by 19 so that the inside air introduction rate decreases to the allowable value R. As a result, the outside air introduction rate increases, and the conditioned air containing outside air with a sufficient air volume for safety is blown out from the air conditioning duct 2 into the vehicle interior. Next, the conditioned air containing outside air with a sufficient air volume for safety as described above When the detected value d of the carbon dioxide concentration exceeds a preset upper limit value of 1.5% for safety even though the increase in the carbon dioxide concentration in the vehicle interior is suppressed by supplying A stop signal for stopping the compressor 20 is outputted from the means 19.

  In the first embodiment configured as described above, the conditioned air including the outside air having a sufficient air volume for safety is blown out from the air conditioning duct 2 into the vehicle interior, thereby suppressing the increase in the carbon dioxide concentration in the vehicle interior due to the breathing of the occupant. it can. And since the air volume and temperature of air-conditioning wind do not change abruptly against the passenger's intention, it is possible to ensure a comfortable air-conditioning effect in the passenger compartment.

  Further, in the first embodiment, when the carbon dioxide as the refrigerant leaks from the heat exchanger 8 and the detected value d of the carbon dioxide concentration in the passenger compartment exceeds the predetermined upper limit value 1.5%, the external refrigerant circuit 7 Since the compressor 20 is stopped, the external refrigerant circuit 7 can be protected, and a dangerous state of adversely affecting passengers in the passenger compartment can be prevented.

  The effect of carbon dioxide on the human body is known, and the carbon dioxide concentration is 0.5%, which is a long-term safety limit. A carbon dioxide concentration of 1.5% can withstand a long period of time without affecting workability and basic physiological functions, but may affect calcium and phosphorus metabolism. Further, when the carbon dioxide concentration is 2.0%, the respiration becomes deep, and when it is 4.0%, the respiration becomes more difficult. Therefore, in the above-described embodiment, the upper limit R of the inside air introduction rate indicated by the solid line L1 in FIG. 2 is set within a range up to 1.5% where the carbon dioxide concentration is considered to be relatively safe.

  Moreover, in the said embodiment, although the heat core 10 which can heat the air shunted by the air mix door 9 by using the engine as a heat source in the air conditioning duct 2 is provided, the air shunted by the air mix door 9 instead of the heat core 10 It is also possible to provide a heat exchanger capable of heating.

(Second Embodiment)
A second embodiment of the present invention is shown in FIGS.

  The vehicle air conditioner of the second embodiment shown in FIG. 4 differs from the first embodiment shown in FIG. 1 in that it includes another controller 23 instead of the controller 15, Basically the same.

The controller 23 of the present embodiment is safe for the air volume setting means 24 for setting the air volume passing through the air conditioning duct 2 in FIG. 1 and the carbon dioxide concentration in the vehicle compartment detected by the gas concentration detection means 14 in FIG. The permissible value calculation means 25 for calculating the required lower limit value of the minimum air volume, the set value of the air volume is compared with the lower limit value of the minimum air volume, and a detection signal is output when the set value of the air volume is smaller than the lower limit value of the minimum air volume. Comparing means 26 for outputting and control means 27 for controlling the blower 6 of FIG. 1 so as to increase the air volume according to the detection signal are provided. In this controller 23, the lower limit value V of the minimum air volume indicated by the solid line L2 in FIG. 5 is set within a range where the carbon dioxide concentration (CO ₂ concentration) is considered to be relatively safe up to 1.5%. When the detected value d of the carbon dioxide concentration is 0.5% or less, the lower limit value V of the minimum air volume is minimized, while when the detected value d of the carbon dioxide concentration is 1.5%, the lower limit value of the minimum air volume. V is maximized, and during this period, the lower limit value V of the minimum air volume increases in proportion to an increase in the detected value d of the carbon dioxide concentration. Further, when the detected value d of the carbon dioxide concentration in the passenger compartment exceeds the upper limit 1.5% set in advance for safety, a stop signal for stopping the compressor 20 of the external refrigerant circuit 7 in FIG. Output.

  In the second embodiment, the carbon dioxide concentration in the passenger compartment is monitored according to the processing procedure shown in FIG. That is, first, as step S11, the gas concentration detecting means 14 detects the carbon dioxide concentration existing inside the passenger compartment, and based on the detected value d of the carbon dioxide concentration, the allowable value calculating means 25 detects the lower limit (allowable) of the minimum air volume. (Minimum air volume) V is calculated. In step S12, the setting value Va of the air volume is compared with the lower limit value V of the minimum air volume by the comparison means 26. As a result, when the airflow setting value Va is equal to or higher than the minimum airflow lower limit value V, the state is maintained as it is. On the other hand, when the airflow setting value Va is smaller than the minimum airflow lower limit value V, it is detected from the comparison means 26. Since a signal is output, as step S13, the blower 6 is controlled by the control means 27 so that the air volume increases to the lower limit value V of the minimum air volume based on this detection signal. As a result, the air-conditioning air having a sufficient air volume for safety is blown out from the air-conditioning duct 2 into the passenger compartment.

  Subsequently, the detected value d of the carbon dioxide concentration in the vehicle interior is safe even though the increase in the carbon dioxide concentration in the vehicle interior is suppressed by supplying the conditioned air with a sufficient air volume for safety as described above. When the upper limit value 1.5% set in advance is exceeded, a stop signal for stopping the compressor 20 of FIG.

  In the second embodiment configured as described above, the air-conditioning air having a sufficient air volume for safety is blown out from the air-conditioning duct 2 into the passenger compartment, so that the influence of the detected value d of the carbon dioxide concentration due to the breathing of the occupant can be suppressed. And since the increase in the air volume of the conditioned air blown into the passenger compartment is kept to the minimum necessary, it is relatively small, and the air volume and temperature of the air conditioned air do not change drastically against the passenger's intention. A comfortable air-conditioning effect in the passenger compartment can be ensured.

  Also in this second embodiment, when the carbon dioxide as the refrigerant leaks from the heat exchanger 8 in FIG. 1 and the detected value d of the carbon dioxide concentration in the passenger compartment exceeds the predetermined upper limit value 1.5%, the compressor 20 is stopped, so that the external refrigerant circuit 7 can be protected and a dangerous state of adversely affecting passengers in the vehicle compartment can be prevented.

(Third embodiment)
A third embodiment of the present invention is shown in FIG.

  The vehicle air conditioner of the third embodiment shown in FIG. 7 includes another controller 28 instead of the controllers 15 and 23, as compared with the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. The other structures are basically the same.

  The controller 28 of the present embodiment includes an introduction rate setting unit 29 that sets an inside air introduction rate of the air introduced into the air conditioning duct 2 in FIG. 1 and an air volume setting unit that sets the amount of air passing through the air conditioning duct 2. 30 and an allowable value calculation means 31 for calculating the upper limit value of the inside air introduction rate and the lower limit value of the minimum air volume required for safety based on the carbon dioxide concentration in the passenger compartment, and the upper limit of the set value of the inside air introduction rate When the set value of the inside air introduction rate is larger than the upper limit value, the first detection signal is output, and the set value of the air volume is compared with the lower limit value of the minimum air volume. The comparison means 32 that outputs the second detection signal when the set value is small, and the intake door 5 is controlled so that the inside air introduction rate decreases according to the first detection signal, and according to the second detection signal. Increased air volume in air conditioning duct 2 And a control unit 33 for controlling the blower 6 to. Further, the controller 28 stores the inside air introduction rate data of FIG. 2 and the minimum air volume data of FIG. 5 in advance.

  Even in the third embodiment, the same effects as those of the first embodiment shown in FIGS. 1 to 3 and the second embodiment shown in FIGS. 4 to 6 can be obtained.

  The present invention has an effect that a vehicle air conditioner that can provide a comfortable and safe air-conditioning environment to passengers using carbon dioxide as a refrigerant is obtained, so that environmental pollution prevention is considered without using the previous fluorocarbon gas. The present invention can be applied to a so-called environment-friendly vehicle, for example, a small vehicle or a vehicle such as a minivan on which a large number of people board.

1 is a diagram showing a vehicle air conditioner according to a first embodiment of the present invention. It is a characteristic view which shows the upper limit of the inside air introduction rate memorize | stored beforehand in the vehicle air conditioner of FIG. It is a flowchart which shows the process sequence at the time of monitoring the carbon dioxide concentration in a vehicle interior by the vehicle air conditioner of FIG. It is a figure explaining the vehicle air conditioner which concerns on 2nd Embodiment of this invention. It is a characteristic view which shows the upper limit of the inside air introduction rate memorize | stored beforehand in the vehicle air conditioner of FIG. It is a flowchart which shows the process sequence at the time of monitoring the carbon dioxide concentration of a vehicle interior by the vehicle air conditioner of FIG. It is a figure explaining the vehicle air conditioner which concerns on 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Air conditioning duct 3 Outside air introduction port 4 Inside air introduction port 5 Intake door 6 Blower 7 External refrigerant circuit 8 Heat exchanger 11-13 Outlet 14 Gas concentration detection means 15 Controller 16 Introduction rate setting means 17 Allowable value calculation Means 18 Comparison means 19 Control means 20 Compressor 23 Controller 24 Air volume setting means 25 Allowable value calculation means 26 Comparison means 27 Control means 28 Controller 29 Introduction rate setting means 30 Air volume setting means 31 Allowance value calculation means 32 Comparison means 33 Control means

Claims (4)

Outside air introduction port (3) and inside air introduction port (4) communicating with the outside and inside of the cabin respectively on the most upstream side of the air conditioning duct (2) disposed inside the cabin, and these outside air introduction ports (3) and an inside air inlet (4) are opened and closed, and an intake door (5) for adjusting the introduction rate of outside air and inside air is provided, and the outside air or the inside air is sucked downstream of the intake door (5). And a heat exchanger (8) for exchanging heat using a refrigerant circulating in the external refrigerant circuit (7), and a plurality of blowers from the air conditioning duct (2). A vehicle air conditioner (1) configured to blow conditioned air into the interior of the passenger compartment through outlets (11, 12, 13),
Based on the detected value of the carbon dioxide concentration, the introduction rate setting means (16) for setting the inside air introduction rate, the gas concentration detecting means (14) for detecting the concentration of carbon dioxide existing inside the passenger compartment, and An allowable value calculating means (17) for calculating an upper limit value of the inside air introduction rate, and comparing the set value of the inside air introduction rate with the upper limit value of the inside air introduction rate. Comparing means (18) for outputting a detection signal when it is large, and control means (19) for controlling the intake door (5) so that the inside air introduction rate is reduced according to the detection signal. The vehicle air conditioner (1) characterized. Outside air introduction port (3) and inside air introduction port (4) communicating with the outside and inside of the cabin respectively on the most upstream side of the air conditioning duct (2) disposed inside the cabin, and these outside air introduction ports (3) and an inside air inlet (4) are opened and closed, and an intake door (5) for adjusting the introduction rate of outside air and inside air is provided, and the outside air or the inside air is sucked downstream of the intake door (5). And a heat exchanger (8) for exchanging heat using a refrigerant circulating in the external refrigerant circuit (7), and a plurality of blowers from the air conditioning duct (2). A vehicle air conditioner configured to blow conditioned air into the passenger compartment through outlets (11, 12, 13),
An air volume setting means (24) for setting the air volume passing through the air conditioning duct (2), a gas concentration detection means (14) for detecting the carbon dioxide concentration existing in the passenger compartment, and the carbon dioxide concentration Allowable value calculating means (25) for calculating a lower limit value of the minimum air volume required for safety based on the detected value, and comparing the set value of the air volume with the lower limit value of the minimum air volume, and from the lower limit value, the air volume The comparison means (26) for outputting a detection signal when the set value is small, and the control means (27) for controlling the blower so that the amount of air passing through the air conditioning duct (2) increases in accordance with the detection signal. And a vehicle air conditioner. Outside air introduction port (3) and inside air introduction port (4) communicating with the outside and inside of the cabin respectively on the most upstream side of the air conditioning duct (2) disposed inside the cabin, and these outside air introduction ports (3) and an inside air inlet (4) are opened and closed, and an intake door (5) for adjusting the introduction rate of outside air and inside air is provided, and the outside air or the inside air is sucked downstream of the intake door (5). And a heat exchanger (8) for exchanging heat using a refrigerant circulating in the external refrigerant circuit (7), and a plurality of blowers from the air conditioning duct (2). A vehicle air conditioner configured to blow conditioned air into the passenger compartment through outlets (11, 12, 13),
An introduction rate setting means (29) for setting the inside air introduction rate, an air volume setting means (30) for setting the air volume passing through the air conditioning duct (2), and a carbon dioxide concentration existing inside the passenger compartment. Gas concentration introduction rate detecting means (14) to detect and allowable value calculation for calculating the upper limit value of the inside air introduction rate and the lower limit value of the minimum air volume required for safety based on the detected value of the carbon dioxide concentration The means (31) compares the set value of the inside air introduction rate with the upper limit value of the inside air introduction rate, and outputs a first detection signal when the set value of the inside air introduction rate is larger than the upper limit value. Comparing the setting value of the air volume with a lower limit value of the minimum air volume, and outputting a second detection signal when the air flow setting value is smaller than the lower limit value; and the first detection Depending on the signal, the inside air introduction rate Control means for controlling the intake door (6) to be small and controlling the blower (6) so that the amount of air passing through the air conditioning duct (2) is increased in response to the second detection signal ( 33) A vehicle air conditioner.   The compressor (20) of the external refrigerant circuit (7) is stopped when the detected value of the carbon dioxide concentration exceeds an upper limit value set in advance for safety. The vehicle air conditioner described in any one of 3 above.

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