JP2014104901A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress unnecessary actuation of a compressor.SOLUTION: When actuation of a blower motor at water temperature equal to or less than predetermined water temperature at temperature of glass equal to or less than predetermined temperature is inhibited, a compressor 14 switches on therefore dehumidification capacity is not expected. Therefore actuation of the compressor 14 is inhibited regardless of a detection result of glass humidity even if humidity reaches to humidity equal to or less than humidity of threshold. Or humidity of threshold is changed into a larger value and actuation of the compressor 14 is delayed.

Description

  The present invention relates to a vehicle air conditioner, and more particularly to a vehicle air conditioner that circulates a refrigerant by a compressor and removes fogging of glass.

  Various technologies have been proposed as a vehicle air conditioner that circulates a refrigerant by a compressor and air-conditions a vehicle interior.

  For example, in the technique described in Patent Document 1, when the target blowing temperature is higher than 40 ° C. when the compressor is stopped, a normal inside air introduction ratio is calculated assuming that a temperature difference is likely to occur, and the target blowing temperature is 40 ° C. When the temperature is lower than the above, it is proposed that the temperature difference is less likely to occur, and the comfort-priority inside air ratio having a higher outside air introduction rate than the normal inside air ratio is calculated.

  In the technique described in Patent Document 1, it is described that the humidity threshold value for operating the compressor is changed for each control mode, and when the threshold value is exceeded, the compressor is turned on to perform dehumidification.

Japanese Patent Laid-Open No. 9-040138

  However, when the temperature of the air blown from the blower is low, such as in the morning of winter, when the temperature of the blower is low, the compressor may be operated according to the threshold value as in the technique described in Patent Document 1. The dehumidifying capacity is not much different from that when the compressor is not operated, and power is wasted as much as the compressor is operated.

  The present invention has been made in view of the above-described facts, and an object thereof is to suppress useless operation of the compressor.

  In order to achieve the above object, the invention described in claim 1 is characterized in that the humidity detected by the compressor for dehumidifying the interior of the vehicle and the humidity detecting means for detecting the humidity in the interior of the vehicle is equal to or higher than a predetermined threshold humidity. If the compressor is controlled to operate, and it is determined that a predetermined warm-up state is not expected to eliminate glass fogging even when the compressor is operated, the operation of the compressor is prohibited, or the threshold humidity And a control means for controlling so as to suppress the operation of the compressor.

  According to the first aspect of the present invention, the compressor dehumidifies the interior of the vehicle interior by operating. That is, the fogging of the glass can be eliminated by operating the compressor.

  The control means is controlled to operate the compressor when the humidity detected by the humidity detecting means for detecting the humidity in the passenger compartment is equal to or higher than a predetermined humidity. In the case of a predetermined warm-up state that cannot be expected, the operation of the compressor is prohibited or the threshold humidity is changed to a high value to control the operation of the compressor. In other words, when the humidity is high, the compressor is operated to remove the fogging of the glass, but in the warm-up state where the ability to eliminate the glass fogging cannot be expected, the operation of the compressor is suppressed. Can be suppressed. In addition, fuel efficiency is improved by suppressing useless operation of the compressor.

  Note that, as in the second aspect of the present invention, the control means, when the temperature of the cooling water of the internal combustion engine is equal to or lower than a predetermined water temperature, and within the predetermined time since the ignition switch is turned on, Conditions for determining the warm-up state including at least one of the case where the temperature is equal to or lower than the predetermined temperature, the glass temperature is equal to or lower than the predetermined temperature, and the target blowing temperature is equal to or lower than the predetermined temperature In such a case, the warm-up state may be determined.

  For example, in the warm-up state, the glass temperature is low, and the cooling water temperature is low immediately after the engine starts. Therefore, as in the invention according to claim 3, the control means is configured such that the glass temperature is equal to or lower than a predetermined temperature. When the temperature of the cooling water of the internal combustion engine is equal to or lower than a predetermined water temperature, it is possible to determine a warm-up state in which the glass fog removal ability cannot be expected even if the compressor is operated by determining that the warm-up state is established. Is possible.

  Further, as in the invention according to claim 4, the control means circulates the air in the vehicle compartment in a range where the glass is not fogged based on the detection result of the humidity detection means in the warm-up state. You may make it control further so that it may be in an inside air circulation mode. As a result, in the case of a vehicle that performs heating using engine cooling water, the amount of engine heat used can be reduced and the vehicle interior can be quickly warmed, and an electric vehicle or hybrid that performs heating using an electric heater or the like. In the case of a vehicle such as an automobile, the amount of electric heater used can be reduced and the vehicle interior can be warmed quickly.

  As described above, according to the present invention, it is possible to suppress useless operation of the compressor by controlling the operation of the compressor when the glass fogging capacity cannot be expected even if the compressor is operated. There is an effect.

It is a block diagram which shows schematic structure of the vehicle air conditioner concerning embodiment of this invention. It is a flowchart which shows an example of the process performed with the air-conditioner ECU of the vehicle air conditioner concerning embodiment of this invention. It is a timing chart for demonstrating the prevention example of the useless operation | movement of a compressor. It is a flowchart which shows the modification of the process performed by the air-conditioner ECU of the vehicle air conditioner concerning embodiment of this invention.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a vehicle air conditioner according to an embodiment of the present invention.

  In the vehicle air conditioner 10, a refrigerant cycle including a compressor 14, a condenser 16, an expansion valve 18, and an evaporator 20 constitutes a refrigeration cycle.

  The compressor 14 compresses the refrigerant and circulates the circulation path. The compressor 14 may be mechanically driven using the power of the vehicle, or may be driven without the power of the vehicle by applying an electric compressor. In the case of mechanical driving, on / off of the compressor 14 can be controlled by an electromagnetic clutch that performs transmission / reception of power. In addition, when applying a mechanically driven compressor, the vehicle air conditioner 10 can be mounted on a vehicle that travels with the power of an internal combustion engine such as an engine, a hybrid vehicle that includes an engine and a motor, When the electric compressor is applied, the vehicle air conditioner 10 can be mounted on an electric vehicle or the like in addition to the above. Hereinafter, an example mounted on a vehicle equipped with an engine will be described as an example. .

  The evaporator 20 cools the air passing through the evaporator 20 (hereinafter referred to as air after the evaporator) by vaporizing the compressed and liquefied refrigerant. At this time, the evaporator 20 cools the passing air so as to condense moisture in the air, thereby dehumidifying the air after the evaporator 20.

  The expansion valve 18 provided on the upstream side of the evaporator 20 supplies the refrigerant to the evaporator in a mist state by rapidly depressurizing the liquefied refrigerant. The vaporization efficiency of the refrigerant is improved.

  The evaporator 20 of the vehicle air conditioner 10 is provided inside the air conditioning duct 38. The air conditioning duct 38 is open at both ends, and air intake ports 40 and 42 are formed at one opening end. Further, a plurality of air outlets 44 (44A, 44B, and 44C are shown as an example in the present embodiment) that are opened toward the vehicle interior are formed at the other opening end. Examples of the air outlet 44 include an outlet (DEF) that blows out toward the glass, an outlet (FACE) that blows out toward the occupant, and an outlet (FOOT) that blows out toward the feet.

  The air inlet 42 communicates with the outside of the vehicle and can introduce outside air into the air conditioning duct 38. Further, the air intake port 40 communicates with the passenger compartment so that air (inside air) in the passenger compartment can be introduced into the air conditioning duct 38. The air outlet 44 is, for example, a defroster outlet 44A that blows air toward a windshield glass (hereinafter simply referred to as glass), a side and center register outlet 44B, and a foot outlet 44C.

  A blower fan 46 is provided in the air conditioning duct 38 between the evaporator 20 and the air intake ports 40 and 42. A mode switching damper 48 is provided in the vicinity of the air intake ports 40 and 42. The mode switching damper 48 opens and closes the air intake ports 40 and 42 by the operation of an actuator such as the mode switching damper motor 24.

  The blower fan 46 is rotated by driving of the blower motor 22, sucked into the air conditioning duct 38 from the air intake port 40 to the air intake port 42, and further sends this air toward the evaporator 20. At this time, outside air or inside air is introduced into the air conditioning duct 38 in accordance with the open / close state of the air intake ports 40 and 42 by the mode switching damper 48. That is, the mode switching damper 48 switches between the inside air circulation mode and the outside air introduction mode.

  An air mix damper 50 and a heater core 52 are provided downstream of the evaporator 20. The air mix damper 50 is rotated by driving the air mix damper motor 36 to adjust the amount of air after the evaporator 20 that passes through the heater core 52 and the amount that bypasses the heater core 52. The heater core 52 circulates engine coolant and heats the air guided by the air mix damper 50 with the engine coolant.

  The air after the evaporator 20 is guided to the heater core 52 according to the opening degree of the air mix damper 50 and heated, and further mixed with the air not heated by the heater core 52 and then sent to the air outlet 44. Is done. In the vehicle air conditioner 10, the air mix damper 50 is controlled to adjust the amount of air heated by the heater core 52, thereby adjusting the temperature of the air blown out from the air blowing port 44 toward the vehicle interior.

  In the vicinity of each air outlet 44, an outlet switching damper 54 is provided correspondingly. In the vehicle air conditioner 10, the air outlets 44 </ b> A, 44 </ b> B, and 44 </ b> C are opened and closed by the outlet switching damper 54, so that the temperature-adjusted air can be blown from a desired position into the vehicle interior.

  The vehicle air conditioner 10 also includes an air conditioner ECU (Electronic Control Unit) 11 for performing various controls of the vehicle air conditioner 10. The air conditioner ECU 11 includes the blower motor 22, the mode switching damper motor 24, the air mix damper motor 36, the outlet switching damper motor 34, the compressor 14, the outside air temperature sensor 32, the inside air temperature sensor 30, the solar radiation sensor 28, glass, and the like. The humidity sensor 13 and the glass temperature sensor 15 are connected, and an operation unit 19 for performing various operations of the vehicle air conditioner 10 such as temperature setting of the vehicle air conditioner 10 and selection of the outlet is connected. The detected values of the outside air temperature sensor 32, the inside air temperature sensor 30, the solar radiation sensor 28, the glass humidity sensor 13, and the glass temperature sensor 15 are input to the air conditioner ECU 11, and the setting of the operation unit 19 is set based on the detection result of each sensor. The air conditioning in the passenger compartment is controlled accordingly. The glass humidity sensor 13 and the glass temperature sensor 15 are respectively provided on the glass. The glass humidity sensor 13 detects the humidity in the vehicle interior (particularly near the glass), and the glass temperature sensor 15 detects the glass atmosphere temperature. To do. Moreover, although the glass humidity sensor 13 and the glass temperature sensor 15 are shown separately, they may be integrated.

  Further, an engine ECU 12 that controls the operation of the engine is connected to the air conditioner ECU 11. In the present embodiment, the detected value of the water temperature sensor 17 that detects the water temperature of the engine cooling water input to the engine ECU 12 is input to the air conditioner ECU 11. Although the present embodiment shows an example in which the detected value of the water temperature sensor 17 is input to the air conditioner ECU 11 via the engine ECU 12, the water temperature sensor 17 may be directly connected to the air conditioner ECU 11.

  The air conditioner ECU 11 controls the blower motor 22, the compressor 14, the mode switching damper motor 24, the air mix damper motor 36, the outlet switching damper motor 34, and the like on the basis of the detection values of the sensors. Air conditioning is to be performed.

  As an example of various controls performed by the air conditioner ECU 11, for example, when the ignition switch is turned on, the target blowing temperature is obtained by the following (1) based on the detection result of each sensor, the setting content of the operation unit 19, and the like. Air-conditioning control is performed so that the target blowing temperature is reached.

Tao = k1, Tset-k2, Ta-k3, Tr-k4, ST + C (1)
Here, k1, k2, k3, k4, and C represent constants, Tset represents the set temperature, Tr represents the cabin temperature, Ta represents the outside temperature, and ST represents the amount of solar radiation.

  In addition, when the air conditioner ECU 11 performs air conditioning control, on / off control of the compressor 14, drive control of the air mix damper motor 36, switching control of the air outlet 44, and air intake 40 according to the target outlet temperature and the like. , 42 switching control (mode switching control in the inside air circulation mode and outside air introduction mode) and the like are also performed. The switching control of the air intake ports 40 and 42 may be performed manually by the occupant operating the operation unit 19.

  Further, the air conditioner ECU 11 performs anti-fogging control by controlling the compressor 14 to be turned on and dehumidifying when the humidity detected by the glass humidity sensor 13 is equal to or higher than a predetermined threshold humidity. It has become.

  The air conditioner ECU 11 controls the blower motor 22 so as to prevent a cold wind in winter when the water temperature detected by the water temperature sensor 17 is equal to or lower than a predetermined threshold water temperature.

  By the way, in the above-described antifogging control, the compressor 14 is controlled to be turned on when the detection result of the glass humidity sensor 13 is equal to or higher than the threshold humidity. However, the glass is sufficiently cooled by radiation cooling as in the morning in winter. Under the condition of being easily cloudy, since the room temperature is low, the absolute humidity becomes low, and even if the compressor 14 is turned on, a sufficient dehumidifying function cannot be expected. In other words, although the dehumidifying function cannot be expected, turning on the compressor 14 is inefficient and adversely affects fuel consumption.

  Therefore, in the present embodiment, the operation of the compressor 14 is prohibited or the threshold humidity is changed in a predetermined warm-up state in which the glass defogging ability cannot be expected even when the compressor 14 is turned on. The useless operation is suppressed.

  Specifically, the operation of the blower motor 22 in which the glass temperature detected by the glass temperature sensor 15 is equal to or lower than a predetermined temperature and the water temperature detected by the water temperature sensor 17 is equal to or lower than the predetermined water temperature is prohibited. The case is detected as a warm-up state, and in the case of the warm-up state, the operation of the compressor 14 is prohibited even if the detected value of the glass humidity sensor 13 exceeds the threshold humidity. Alternatively, by changing the threshold humidity to a large value and delaying the operation of the compressor 14, useless operation of the compressor 14 is suppressed. As a result, the operation of the compressor 14 is suppressed, and an improvement in fuel consumption can be expected.

  Subsequently, a part of operations performed by the air conditioner ECU 11 of the vehicle air conditioner 10 configured as described above according to the embodiment of the present invention will be described. FIG. 2 is a flowchart illustrating an example of processing performed by the air conditioner ECU 11 of the vehicle air conditioner 10 according to the embodiment of the present invention. Note that the processing in FIG. 2 starts when the ignition (IG) switch is turned on while the automatic air conditioner is instructed, or when the operation of the air conditioner is instructed.

  First, in step 100, each sensor value is acquired, and the process proceeds to step 102. That is, the air conditioner ECU 11 acquires detection values of sensors such as the outside air temperature sensor 32, the inside air temperature sensor 30, the solar radiation sensor 28, the water temperature sensor 17, the glass humidity sensor 13, and the glass temperature sensor 15.

  In step 102, it is determined whether or not the warm-up state is set. The determination is made, for example, whether or not the glass temperature detected by the glass temperature sensor 15 is equal to or lower than a predetermined temperature and the water temperature detected by the water temperature sensor 17 is equal to or lower than the predetermined water temperature and the blower motor 22 is not operating. If the determination is affirmative, the process proceeds to step 104. If the determination is negative, the process proceeds to step 106.

  In step 104, the compressor 14 is prohibited from being turned on by the threshold humidity, and the routine proceeds to step 110. As a result, the compressor 14 does not operate even when the humidity detected by the glass humidity sensor 13 is equal to or higher than the threshold humidity, so that the useless operation of the compressor 14 in the warm-up state where the glass has cooled down is suppressed. At this time, the mode switching damper motor 24 may be controlled so that the inside air circulation mode is set in a range where the glass is not fogged with reference to the detection value of the glass humidity sensor 13. By setting the inside air circulation mode, in the hybrid vehicle, the amount of engine heat used can be reduced and the vehicle interior can be warmed up quickly. Further, when heating is performed using an electric heater in a hybrid vehicle, an electric vehicle, or the like, the usage amount of the electric heater can be reduced and the vehicle interior can be quickly warmed.

  On the other hand, in step 106, it is determined whether or not the humidity detected by the glass humidity sensor 13 is equal to or higher than the threshold humidity. If the determination is affirmative, the process proceeds to step 108 and the compressor 14 is turned on and step 110 is performed. If the determination is negative, the process proceeds to step 110 as it is.

  In step 110, it is determined whether or not the water temperature detected by the water temperature sensor 17 is equal to or higher than the threshold water temperature. If the determination is negative, the process proceeds to step 112. If the determination is affirmative, the process proceeds to step 114.

  In step 112, the operation of the blower motor 22 is prohibited, a series of processes are returned, the process returns to step 100, and the above processes are repeated.

  In step 114, the blower motor 22 is turned on and the blower is operated, and the process proceeds to step 116.

  In step 116, normal air-conditioning control is performed, a series of processes are returned, the process returns to step 100, and the above processes are repeated. In the normal air conditioning control, for example, the target blowing temperature (TAO) is obtained based on the detection value of each sensor, the set temperature instructed to the operation unit 19 and the like, and the air is adjusted so as to be the obtained target blowing temperature. Controls the mix damper motor 36, blower motor 22, compressor 14, and the like, and controls the mode switching damper motor 24, the blowout switching damper motor 34, and the like based on the setting of the operation unit 19.

  In the processing of FIG. 2, the processing of steps 110 to 114 is performed following the processing of steps 102 to 108. However, the processing of steps 102 to 108 may be performed in the order of the processing of steps 110 to 114. Good.

  Here, a specific example when processing is performed as described above will be described. FIG. 3 is a timing chart for explaining an example of preventing unnecessary operation of the compressor 14.

  When the passenger gets on and the IG switch is turned on while the air conditioner is instructed, the engine starts and the water temperature (E / G water temperature) gradually rises. At this time, when a predetermined threshold water temperature at which a warm blowing temperature can be secured is reached, the blower motor 22 is turned on to operate the blower.

  In the example of FIG. 3, the blower outlet switching damper motor 34 is operated so that the blower outlet becomes a blower outlet (DEF) that blows out toward the glass up to a water temperature at which a warm blowout temperature can be secured, and a warm blowout temperature is ensured. The blower outlet switching damper motor 34 is operated so that the blowout outlet (FOOT) blows out from the feet when the water temperature is reached.

  The glass humidity gradually rises and exceeds a predetermined threshold humidity as the passenger gets on, but the blower motor 22 is turned off, so the humidity continues to rise and the blower motor 22 is turned on and the blower is activated. When it begins, the glass temperature begins to rise and the humidity rise begins to fall. At this time, conventionally, the compressor 14 is controlled to be turned on and dehumidified when the threshold humidity is exceeded, but the temperature of the glass is equal to or lower than a predetermined temperature and the water temperature is equal to or lower than the predetermined water temperature. In the state where the operation is prohibited, since the dehumidifying ability cannot be expected by turning on the compressor 14, in this embodiment, as shown by the dotted line in FIG. The operation of the compressor 14 is prohibited ignoring the detection result. As a result, useless operation of the compressor 14 can be suppressed, leading to an improvement in fuel consumption.

  In the processing of FIG. 2 described above, the processing in the case of prohibiting the operation of the compressor 14 in the case of a predetermined warm-up state in which the glass fog removal ability cannot be expected even when the compressor 14 is turned on has been described. A case where the threshold humidity is changed will be described. FIG. 4 is a flowchart showing a modification of the process performed by the air conditioner ECU 11 of the vehicle air conditioner 10 according to the embodiment of the present invention. Note that the processing in FIG. 4 also starts when the ignition (IG) switch is turned on while the automatic air conditioner is instructed or when the operation of the air conditioner is instructed.

  In step 200, each sensor value is acquired, and the process proceeds to step 202. That is, the air conditioner ECU 11 acquires detection values of sensors such as the outside air temperature sensor 32, the inside air temperature sensor 30, the solar radiation sensor 28, the water temperature sensor 17, the glass humidity sensor 13, and the glass temperature sensor 15.

  In step 202, it is determined whether or not the warm-up state is set. The determination is made, for example, whether or not the glass temperature detected by the glass temperature sensor 15 is equal to or lower than a predetermined temperature and the water temperature detected by the water temperature sensor 17 is equal to or lower than the predetermined water temperature and the blower motor 22 is not operating. If the determination is affirmative, the process proceeds to step 204. If the determination is negative, the process proceeds to step 206.

  In step 204, the threshold humidity at which the compressor 14 is turned on is changed, and the routine proceeds to step 210. For example, by changing the threshold humidity to a predetermined large value and making it difficult for the compressor 14 to be turned on, unnecessary operation of the compressor 14 in a warm-up state in which the glass has cooled down is suppressed. At this time, the mode switching damper motor 24 is controlled so that the inside air circulation mode is set in a range where the glass is not fogged (for example, a range within a predetermined humidity) with reference to a detection value of the glass humidity sensor 13. It may be. By setting the inside air circulation mode, in the hybrid vehicle, the amount of engine heat used can be reduced and the vehicle interior can be warmed up quickly. Further, when heating is performed using an electric heater in a hybrid vehicle, an electric vehicle, or the like, the usage amount of the electric heater can be reduced and the vehicle interior can be quickly warmed.

  On the other hand, in step 206, it is determined whether or not the threshold value has been changed. In the determination, it is determined whether or not the threshold value is changed in the above-described step 204. If the determination is affirmative, the process proceeds to step 208. If the determination is negative, the process proceeds to step 210.

  In step 208, the threshold humidity for turning on the compressor 14 is returned to the original, and the routine proceeds to step 210.

  In step 210, it is determined whether or not the threshold humidity has been reached. If the determination is affirmative, the flow proceeds to step 212, the compressor 14 is turned on, the flow proceeds to step 214, and the determination is negative. Proceeds to step 214 as it is.

  In step 214, it is determined whether or not the water temperature detected by the water temperature sensor 17 is equal to or higher than the threshold water temperature. If the determination is negative, the process proceeds to step 216. If the determination is affirmative, the process proceeds to step 218.

  In step 216, the operation of the blower motor 22 is prohibited, a series of processes are returned, the process returns to step 200, and the above processes are repeated.

  In step 218, the blower motor 22 is turned on and the blower is operated, and the process proceeds to step 220.

  In step 220, normal air-conditioning control is performed, a series of processes are returned, the process returns to step 200, and the above processes are repeated. In the normal air conditioning control, for example, the target blowing temperature (TAO) is obtained based on the detection value of each sensor, the set temperature instructed to the operation unit 19 and the like, and the air is adjusted so as to be the obtained target blowing temperature. Controls the mix damper motor 36, blower motor 22, compressor 14, and the like, and controls the mode switching damper motor 24, the outlet switching damper motor 34, and the like based on the setting of the operation unit 19.

  In the processing of FIG. 4, the processing of steps 214 to 218 is performed following the processing of steps 202 to 212. However, the processing of steps 202 to 212 may be performed after the processing of steps 214 to 218. Good.

  Thus, in the present embodiment, in the case of a predetermined warm-up state in which the ability to eliminate glass fogging cannot be expected even when the compressor 14 is turned on, by prohibiting the operation of the compressor 14 or changing the threshold humidity, The useless operation of the compressor 14 can be suppressed. In addition, fuel efficiency can be improved by suppressing unnecessary operation of the compressor 14.

  In the above-described embodiment, whether the warm-up state is determined is determined by determining whether the glass temperature detected by the glass temperature sensor 15 is equal to or lower than the predetermined temperature and the water temperature detected by the water temperature sensor 17 is predetermined. It is determined whether or not the blower motor 22 is not operating at a temperature below the water temperature, but is not limited to this. For example, it is determined whether or not a predetermined time has elapsed by operating a timer after the IG is turned on. When the predetermined time has not elapsed, the warm-up state is determined, and when the predetermined time has elapsed, the control of the warm-up state in the warm-up state (control for suppressing the operation of the compressor 14) is terminated. You may do it. Alternatively, it is determined whether or not the detected value of the internal air temperature sensor 30 is equal to or higher than a predetermined temperature. When the detected value is lower than the predetermined temperature, the warm-up state is determined. Alternatively, the control may be terminated, or it is determined whether the detected value of the glass temperature sensor 15 is equal to or higher than a predetermined temperature. If the detected value is lower than the predetermined temperature, the warm-up state is determined. You may make it complete | finish the control in a warm-up state, when it becomes more than the defined temperature. Alternatively, it is determined whether or not the detection value of the water temperature sensor 17 is equal to or higher than a predetermined temperature. When the detected value is lower than the predetermined temperature, it is determined that the warm-up state is reached. May be terminated. Alternatively, it is determined whether or not the target blowing temperature (TAO) is equal to or higher than a predetermined temperature. When the target blowing temperature (TAO) is lower than the predetermined temperature, the warm-up state is determined. You may make it complete | finish control. Or you may make it determine whether it is a warm-up state combining multiple said conditions.

  Moreover, although said embodiment is what is called a reheat type vehicle air conditioner, it is not restricted to this, You may make it apply the vehicle air conditioner of another system.

10 Vehicle Air Conditioner 11 Air Conditioner ECU
13 Glass humidity sensor 14 Compressor 15 Glass temperature sensor 17 Water temperature sensor 24 Motor for mode switching damper 30 Internal temperature sensor

Claims (4)

A compressor for dehumidifying the passenger compartment;
When the humidity detected by the humidity detecting means for detecting the humidity in the passenger compartment is equal to or higher than a predetermined threshold humidity, the compressor is controlled to operate, and even if the compressor is operated, the glass fogging ability cannot be expected. If it is determined as a predetermined warm-up state, the control means for prohibiting the operation of the compressor or changing the threshold humidity to a high value to control the operation of the compressor;
A vehicle air conditioner comprising   When the temperature of the cooling water of the internal combustion engine is equal to or lower than a predetermined water temperature, the control means is within a predetermined time after the ignition switch is turned on, the temperature of the passenger compartment temperature is equal to or lower than a predetermined temperature, When the glass temperature is equal to or lower than a predetermined temperature, and when the condition for determining the warm-up state including at least one of the target blowing temperature is equal to or lower than the predetermined temperature is determined, the warm-up state is determined. The vehicle air conditioner according to claim 1.   2. The vehicle air conditioner according to claim 1, wherein the control unit determines that the warm-up state is established when the glass temperature is equal to or lower than a predetermined temperature and the cooling water temperature of the internal combustion engine is equal to or lower than a predetermined water temperature. apparatus.   The said control means is further controlled so that it may be in the inside air circulation mode which circulates the air in a vehicle interior in the range where glass does not fog based on the detection result of the said humidity detection means in the said warm-up state. The vehicle air conditioner according to any one of 1 to 3.

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