JP2010167925A - Vehicular air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular air conditioner capable of preventing cloudiness of window glass, by properly controlling blowout of air-conditioning air from a DEF blowout port, when humidity of the air-conditioning air blown off into a cabin becomes high, when a refrigerating cycle stops from an operating state. <P>SOLUTION: This vehicular air conditioner has a vapor compression type refrigerating cycle, and has a blowout port control means for selecting and controlling a blowout port of the air-conditioning air blown off into the cabin, and prohibits blowout from the DEF blowout port by the blowout port control means for a predetermined time, when the refrigerating cycle is stopped from the operating state, in an air-conditioning state of blowing off the air-conditioning air from the DEF blowout port for blowing off the air-conditioning air from the window glass vicinity. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner, and more particularly to a vehicle air conditioner that effectively prevents fogging of a window glass.

  For example, Patent Document 1 proposes a vehicle air conditioner that determines whether a window glass in a vehicle interior is fogged according to humidity detected by a humidity detection unit (humidity sensor) installed in the vehicle interior. In this proposal, the humidity near the inner surface of the window glass is detected so that the easiness of fogging can be more accurately determined. However, the humidity sensor may have problems in measurement in an actual vehicle interior environment, such as responsiveness to changes in humidity and measurement accuracy in a condensed state.

  In particular, when changing from a state where the vapor compression refrigeration cycle of the vehicle air conditioner is operated to a stopped state at a low outside air temperature, the windshield of the vehicle may become cloudy. In general vehicle air conditioners, air-conditioning air outlets that blow out into the passenger compartment at low outside air temperatures are often in a FOOT mode that blows out from the vicinity of the occupant's feet. The air is often blown from the air outlet. Therefore, when the vapor compression refrigeration cycle shifts from the operating state to the stopped state, the condensed water remaining in the evaporator is vaporized (because the temperature of the evaporator itself increases), so that the vehicle air conditioner is instantaneously The amount of moisture contained in the conditioned air blown from the air increases. As a result, when the humidity of the blown air rises and the conditioned air is blown from the DEF blower outlet, the dew point temperature of the blown air rises and the window glass becomes cloudy.

JP 2007-8449 A

  Therefore, the object of the present invention is to focus on the above problems, and when the vapor compression refrigeration cycle of the vehicle air conditioner is stopped from the operating state, when the humidity of the conditioned air blown into the vehicle interior becomes high, An object of the present invention is to provide a vehicle air conditioner capable of preventing fogging of a window glass by appropriately controlling the blowing of conditioned air from a DEF outlet.

  In order to solve the above-described problems, a vehicle air conditioner according to the present invention cools at least a compressor that compresses refrigerant, a radiator that dissipates high-temperature and high-pressure refrigerant, and air that is blown into the vehicle interior as a cooler. In a vehicle air conditioner having a vapor compression refrigeration cycle provided with a refrigerant evaporator and having an outlet control means for selecting and controlling an outlet for conditioned air to be blown out into a passenger compartment, a vehicle among a plurality of outlets When the vapor compression refrigeration cycle is stopped from a state where the vapor compression refrigeration cycle is operated in an air-conditioning state in which air-conditioning air is blown out from a DEF air outlet from which the air-conditioning air is blown out from the vicinity of the window glass in the room, the air outlet control The means is characterized by prohibiting the blowing from the DEF outlet.

  In such a vehicle air conditioner according to the present invention, the vapor compression refrigeration cycle is in an air-conditioning state in which the air-conditioning air is blown from the DEF blowout port from which air-conditioning air is blown from the vicinity of the window glass (particularly the windshield). When the operation is stopped from the operating state, that is, as described above, the humidity of the blown air rises, and when the conditioned air is blown from the DEF blower outlet, the dew point temperature of the blown air rises to the window glass. The blowout outlet control means prohibits the blowout from the DEF blowout outlet for a predetermined period of time when there is a high possibility that fogging will occur. Due to this prohibition control, there is no blowout from the DEF blowout opening, so that the occurrence of fogging of the window glass is surely avoided.

  In the vehicle air conditioner according to the present invention, the air outlet control means prohibits the air blowing from the DEF air outlet, and after the lapse of a predetermined time A, the prohibition by the air outlet control means is canceled and the air outlet before the inhibition is prohibited. It is preferable to control the outlet state. That is, only when there is a possibility of fogging of the window glass, the blowout from the DEF blowout port is prohibited, and after the predetermined time A has passed, the risk is eliminated, and the normal blowout port control state is restored. .

  In addition, the vehicle air conditioner according to the present invention includes an outside air temperature detecting unit that detects or estimates a physical quantity correlated with the outside air temperature, and an inside / outside air switching unit that adjusts the introduction ratio between the outside air and the inside air of the vehicle. The predetermined time A includes the outside air temperature detected or estimated by the outside air temperature detecting means, the introduction ratio of inside and outside air adjusted by the inside / outside air switching means, the outside air humidity, the rainfall state, the vehicle interior temperature, the vehicle interior It can be determined by referring to at least one of the humidity, the temperature of the evaporator before the operation of the vapor compression refrigeration cycle is stopped, and the evaporator outlet air temperature.

  In this case, the predetermined time A is determined by referring to at least one of the outside air temperature and outside air humidity, the introduction ratio of inside and outside air, the rainfall state, the vehicle interior temperature and the vehicle interior humidity, and the intake air of the evaporator. The dew point temperature is estimated and the temperature of the evaporator before the operation of the vapor compression refrigeration cycle is stopped or the outlet air temperature of the evaporator and the estimated dew point temperature can be determined. That is, the predetermined time A can be determined according to the dew condensation state of the evaporator.

  In this case, the predetermined time A is determined by referring to at least one of the outside air temperature and outside air humidity, the introduction ratio of inside and outside air, the rainfall state, the vehicle interior temperature and the vehicle interior humidity, and the suction of the evaporator. Estimate the dew point temperature of the air, refer to the temperature of the evaporator or the air temperature at the outlet of the evaporator before the operation of the vapor compression refrigeration cycle and the estimated dew point temperature, and determine the vapor compression refrigeration cycle from the dew point temperature of the intake air When the value obtained by subtracting the evaporator temperature or the evaporator outlet air temperature before stopping the operation becomes a positive value, the predetermined time A can be determined according to the subtracted value. That is, the prohibition time of the blowout from the DEF blower outlet is adjusted according to the degree of condensation of the evaporator.

  Alternatively, the dew point temperature of the intake air of the evaporator is estimated by referring to at least one of the outside air temperature and the outside air humidity, the introduction ratio of the inside and outside air, the rainfall state, or the cabin temperature and the cabin humidity. Refer to the temperature of the evaporator before the shutdown of the vapor compression refrigeration cycle or the evaporator outlet air temperature and the estimated dew point temperature, and the temperature of the evaporator before the shutdown of the vapor compression refrigeration cycle from the dew point temperature of the intake air Alternatively, when the value obtained by subtracting the evaporator outlet air temperature becomes a negative value, the prohibition of blowing from the DEF outlet can be canceled. That is, when the evaporator is not condensed, it is determined that the possibility of fogging of the window glass is low, and the blow-off prohibition control from the DEF outlet according to the present invention is canceled.

  Moreover, in the vehicle air conditioner according to the present invention, when the vapor compression refrigeration cycle is stopped from the operating state in the air-conditioning state in which the conditioned air is blown from the DEF outlet, the evaporator before stopping When the temperature or the evaporator outlet air temperature is equal to or higher than a predetermined value, the blowout inhibition control from the DEF outlet by the outlet control means is not performed, and the evaporator temperature or the evaporator outlet air before the stop is performed. When the temperature is lower than the predetermined value, the blowout inhibition control from the DEF blowout port by the blowout port control means can be performed. In this way, even if there is no humidity sensor, the control according to the present invention can be performed, and a configuration without a humidity sensor can be achieved.

  In this case, furthermore, when the outside air temperature is equal to or lower than a predetermined value, it is possible to perform the blowout prohibition control from the DEF blowout port by the blowout port control means. In addition, when there is a window glass temperature detecting means for detecting or estimating a physical quantity correlated with the window glass temperature, and the window glass temperature is equal to or lower than a predetermined value, from the DEF outlet by the outlet control means. The blowout prohibition control can be implemented.

  Further, in the vehicle air conditioner according to the present invention, when the state after the stop of the vapor compression refrigeration cycle is shifted to the operation state, the blow-off prohibition control from the DEF outlet is performed for a predetermined time B after the operation. You can try to continue. That is, in the present invention, in order to prevent fogging of the window glass, basically, when the vapor compression refrigeration cycle is stopped from the operated state in the air-conditioned state in which the conditioned air is blown from the DEF outlet. Although the blowout prohibition control from the blowout port is implemented, it is judged that the possibility of fogging of the window glass still remains when the vapor compression refrigeration cycle is restored from the stopped state to the operating state. In this case, the blowout inhibition control from the DEF blowout outlet for preventing the window glass from fogging can be continued for a predetermined time B.

  In this case, there is a window glass temperature detecting means for detecting or estimating a physical quantity correlated with the window glass temperature, and when the window glass temperature is lower than the evaporator temperature or the evaporator outlet air temperature, the vapor compression refrigeration cycle Blowing prohibition control from the DEF outlet is continued for a predetermined time B after the operation, and when the evaporator temperature or the evaporator outlet air temperature becomes lower than the window glass temperature, the blowing prohibition control from the DEF outlet is controlled. Can be canceled and normal control can be performed. In other words, the continuation time of the blow-off prohibition control from the DEF blow-out outlet after the operation of the vapor compression refrigeration cycle is set to the predetermined time B in principle, but the evaporator temperature or the evaporator outlet air temperature becomes lower than the window glass temperature. When it is determined that the possibility of occurrence of fogging of the glass is low, the blow-off prohibition control from the DEF blow-out port is canceled and the normal control is restored.

  Further, in the vehicle air conditioner according to the present invention, when the compressor of the vapor compression refrigeration cycle can disconnect and connect the driving force by the power transmission mechanism from the drive source at any time, the vapor compression refrigeration cycle The time when the engine is stopped from the operated state does not include the case where the power transmission mechanism is intermittently disconnected and connected in order to control the temperature of the evaporator, and the power transmission mechanism is intermittently disconnected and connected. In other cases, the prohibition control according to the present invention is applied. That is, the operation in the so-called clutch cycling state is not included when the vapor compression refrigeration cycle is stopped from the operated state.

  Moreover, even when the drive source of the compressor of the vapor compression refrigeration cycle is stopped, it is possible to perform the blowout prohibition control from the DEF blowout port. In other words, even when the drive source of the compressor of the refrigeration cycle is stopped, for example, in an idle stop state, the blowout prohibition control from the DEF blowout port is performed so that the occurrence of fogging of the window glass can be prevented. Is.

  Further, when the operation state of the vapor compression refrigeration cycle is changed from the cooling cycle mode to the heating cycle mode, it is considered that the refrigeration cycle is temporarily changed from the operated state to the stopped state, and for a predetermined time, DEF It is possible to perform the blowout prohibition control from the blowout port. That is, even at the time of such a mode transition, the occurrence of fogging of the window glass can be prevented by performing the blowout prohibition control from the DEF blowout outlet according to the present invention.

  As described above, according to the vehicle air conditioner of the present invention, when the vapor compression refrigeration cycle is stopped from the operating state, the blowout from the DEF outlet that causes the fogging of the window glass is basically performed for a predetermined time. Since it is prohibited, the occurrence of fogging of the window glass can be surely effectively prevented. Further, by appropriately determining the prohibition time, and further appropriately determining the control continuation time after the prohibition control for a predetermined time, occurrence of fogging of the window glass can be prevented more reliably.

It is an equipment distribution diagram of an air-conditioner for vehicles concerning one embodiment of the present invention. It is a characteristic view which shows the example of a change of DEF blowing air humidity after the conventional refrigerating cycle stop. It is a characteristic view in Example 1 of this invention. It is a characteristic view in Example 2 of this invention. It is a characteristic view in Example 3 of the present invention. It is a characteristic view in Example 4 of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the entire mechanical components of a vehicle air conditioner according to an embodiment of the present invention, and is provided with a ventilation circuit and a refrigeration circuit (vapor compression refrigeration cycle). The vapor compression refrigeration cycle 11 includes a compression driven by a belt 12 via pulleys 2 and 3 by a vehicle engine 1 as a drive source (however, another drive source such as an electric motor is also possible). 4 (for example, a variable capacity compressor or a fixed displacement compressor), and the compressor 4 is driven via a clutch 13 as a power transmission mechanism that controls transmission of driving force from the engine 1. It has become so. The refrigeration cycle 11 further includes a radiator 6 (for example, a condenser) that cools the refrigerant by heat exchange between the high-temperature and high-pressure refrigerant discharged from the compressor 4 and external air, a radiator cooling fan 7, and a compression. A high-pressure side pressure detecting means 5 for detecting the pressure of the high-pressure refrigerant discharged from the machine 4 on the outlet side of the radiator 6, a liquid receiver 8 (receiver) for gas-liquid separation of the high-pressure refrigerant flowing out of the radiator 6, An expansion means 9 (expansion valve) for adiabatically expanding the refrigerant flowing out from the liquid receiver 8 and an evaporator 10 for cooling the conditioned air sent by evaporating the refrigerant from the expansion means 9 are provided. The refrigerant flowing out of 10 is sent to the compressor 4 and compressed again. As shown in the figure, the high pressure side pressure of the refrigeration cycle 11 preferably detects the refrigerant pressure from the compressor discharge refrigerant pressure to the radiator outlet refrigerant pressure.

  The evaporator 10 is arrange | positioned in the ventilation duct 14 which forms the air path which sends an air conditioned wind into a vehicle interior. Air is introduced into the ventilation duct 14 from the outside air introduction port 15 and the inside air introduction port 16 via the inside / outside air switching damper 17, and the operation of the inside / outside air switching damper 17 is controlled by the inside / outside air switching damper actuator 18. The introduced air is sucked by a blower fan 19 as a blower and is pumped toward the evaporator 10 on the downstream side. An evaporator outlet air temperature sensor 20 (evaporator temperature sensor) is provided on the outlet side of the evaporator 10, and a heater core 21 as a heater is provided on the downstream side of the evaporator 10. The ratio of the air passing through the heater core 21 and the bypassing air is adjusted by the air mix damper 22, and the opening degree of the air mix damper 22 is controlled by the air mix damper actuator 23. The temperature-controlled conditioned air is blown out from the air outlets 27, 28, and 29 through the dampers 24, 25, and 26 toward the vehicle interior. In the air outlets 27, 28 and 29, the air outlet 27 is directed to the DEF mode air outlet from which air-conditioned air is blown from the vicinity of the window glass (particularly the windshield), and the air outlet 28 is directed toward the occupant's trunk. The outlet 29 is configured as a vent outlet in the VENT mode through which the conditioned air is blown out, and the outlet 29 in the FOOT mode that blows out from the vicinity of the passenger's feet. The selection control of the air outlet is performed by the air outlet control means 30, and the air outlet control means 30 is incorporated in the air conditioning control device 31 in this embodiment.

  The air conditioning controller 31 includes an outside air temperature signal from the outside air temperature sensor 32, a solar radiation amount signal from the solar radiation sensor 33 into the vehicle interior, a vehicle interior temperature signal from the vehicle interior temperature sensor 34, and a vehicle interior humidity signal from the humidity sensor 35. , An engine speed signal from the engine speed sensor 36 (including engine operation, stop signal, idle stop signal), high-pressure side refrigerant pressure signal 37 of the high-pressure side pressure detecting means 5, and evaporator outlet air temperature sensor 20 An evaporator outlet air temperature signal (evaporator temperature signal) 38 is input. In this embodiment, the air-conditioning control device 31 sends a clutch control signal 40 to the clutch controller 39 that controls the drive of the compressor 4, and a compressor capacity control signal 41 as an external signal that can control the capacity of the compressor 4. An air mix damper control signal 42 to the compressor 4, an air mix damper control signal 42 to the air mix damper actuator 23, an inside / outside air switching damper control signal 43 to the inside / outside air switching damper actuator 18, and a drive voltage signal 44 (blower voltage signal) to the blower fan 19. , Respectively.

  In the above embodiment, the vapor compression refrigeration cycle uses a chlorofluorocarbon refrigerant, but may be a carbon dioxide refrigerant. The vapor compression refrigeration cycle is equipped with a clutch capable of controlling the drive of the compressor, but may be clutchless. In addition to the mechanical expansion valve, an electronic expansion valve, a temperature expansion valve, a differential pressure expansion valve, or the like may be used as the expansion means of the compression refrigeration cycle. In the above-described vapor compression refrigeration cycle, an external variable capacity compressor that can change the capacity of the compressor by an external control signal is used. However, a fixed capacity compressor may be used. Further, the compressor of the vapor compression refrigeration cycle may be one driven by an engine, one driven by an electric motor, or a hybrid compressor that can be selectively or simultaneously driven by both drive sources.

  In the vehicle air conditioner as described above, in the present invention, for example, when the vapor compression refrigeration cycle is stopped while the conditioned air is blowing from the DEF outlet 27, for example, a window When the dew point temperature of the blown air becomes higher than the window glass temperature by referring to the glass temperature and assuming that the moisture content of the blown air is increased due to the air conditioner OFF state, the DEF blowout is temporarily performed. Prohibit and set to BI-LEVEL or VENT blowing mode, or FOOT if only DEF blowing can be stopped. In this case, both a configuration requiring a humidity sensor and a configuration without a humidity sensor are possible. Moreover, when the humidity of outside air is lower than inside air, it can also be set as outside air introduction mode.

The above embodiment will be described below.
When the vapor compression refrigeration cycle 11 of the vehicle air conditioner is in operation, air is blown out from the window glass, particularly from the DEF outlet 27 that blows out from the vicinity of the windshield, out of the outlet that blows the conditioned air into the passenger compartment. 2, when the operation of the refrigeration cycle is stopped as shown in FIG. 2 in the state of conventional control, the condensed water adhering to the evaporator is increased by the temperature of the evaporator rising. By vaporizing, the humidity of the air that is temporarily blown out increases. Therefore, when the operation of the refrigeration cycle is stopped, the blowing of air from the DEF outlet 27 is prohibited, so that blowing air with increased humidity is not supplied to the vicinity of the windshield, so the windshield is clouded. Can be reliably and effectively prevented. Each example will be described below.

Example 1 (Prohibition of DEF blowing when refrigeration cycle is stopped)
As shown in FIG. 3, when the operation of the compressor 4 of the vapor compression refrigeration cycle 11 is stopped, the outlet control means 30 prohibits the blowing from the DEF outlet 27 and eliminates the blowing from the DEF outlet 27. Thereby, the raise of the humidity of a DEF blowing air part can be suppressed. The prohibition control is performed for at least a predetermined time A. This effectively prevents fogging of the window glass.

Example 2 (from DEF blowing prohibited to DEF blowing resumed)
As shown in FIG. 4, when the operation of the compressor 4 of the vapor compression refrigeration cycle 11 is stopped, the outlet control means 30 prohibits the blowing from the DEF outlet 27 and eliminates the blowing from the DEF outlet 27. Thereby, the raise of the humidity of DEF blowing air can be suppressed. Further, the blowing prohibition control is continued until a predetermined Δt that is a time obtained by adding the predetermined time B to the predetermined predetermined time A. After Δt, the blowing from the DEF outlet 27 is permitted and restarted. Since the humidity of the air blown from the evaporator is predicted to decrease after Δt, the windshield can be prevented from being fogged even if the air is blown from the DEF outlet 27.

Example 3 (Resumption of DEF blowing during refrigerating cycle re-operation)
As shown in FIG. 5, when the operation of the compressor 4 of the vapor compression refrigeration cycle 11 is stopped, the blowout outlet control means 30 prohibits the blowout from the DEF blowout opening 27 and eliminates the blowout from the DEF blowout opening 27. Thereby, the raise of the humidity of DEF blowing air can be suppressed. Furthermore, when the operation of the compressor 4 of the refrigeration cycle is resumed, the air discharge from the DEF outlet 27 is permitted after a predetermined Δt ′ after the operation of the compressor 4 of the refrigeration cycle is resumed. Since the humidity of the air blown from the evaporator may be high at the initial stage of operation of the compressor 4 of the refrigeration cycle, the DEF blowout is resumed after a predetermined time has elapsed since the operation. Since the humidity of the blown-out air is predicted to decrease, the humidity of the DEF blown-out air can be reduced, and fogging of the windshield can be reliably prevented.

Example 4 (Change of cooling amount with respect to inside / outside air change and weather condition)
As shown in FIG. 6, when the operation of the compressor 4 of the vapor compression refrigeration cycle 11 is stopped, when the evaporator outlet air temperature is equal to or lower than a predetermined value A, the blowout from the DEF outlet 27 is performed. By prohibiting and eliminating the blowing from the DEF outlet 27, it is possible to suppress an increase in the humidity of the DEF blowing air. This assumes that when the evaporator outlet air temperature is equal to or lower than the predetermined value A, the dew point temperature of the evaporator suction air is higher than the outlet air of the evaporator. It has occurred. For this reason, when the operation of the compressor 4 of the refrigeration cycle is stopped, it is assumed that the temperature of the evaporator rises so that the humidity of the air blown from the evaporator rises. As a result, the air from the DEF outlet 27 There is a risk that the windshield will be clouded by blowing. In this embodiment, when the operation of the compressor 4 of the vapor compression refrigeration cycle 11 is stopped in a state where the evaporator outlet air temperature is equal to or lower than a predetermined value A, the outlet control means 30 controls the DEF outlet 27. By prohibiting the blowing from the DEF and eliminating the blowing from the DEF outlet 27, it is possible to suppress an increase in humidity near the windshield and prevent the windshield from being fogged.

  In addition to the above embodiment, for example, by detecting or estimating the window glass temperature, when the temperature is equal to or lower than a predetermined glass temperature, when the refrigeration cycle is stopped, the blowout from the DEF outlet 27 is performed. It is also effective to prevent the windshield from fogging. In addition, when the evaporator outlet air temperature falls below the window glass temperature, the DEF blow-off prohibition control is canceled, so that normal air-conditioning control is not affected and fogging of the windshield is effectively suppressed. Is possible.

  The configuration of the vehicle air conditioner according to the present invention can be applied to any vehicle air conditioner equipped with a vapor compression refrigeration cycle.

DESCRIPTION OF SYMBOLS 1 Engine 2, 3 Pulley 4 Compressor 5 High pressure side pressure detection means 6 Radiator 7 Radiator cooling fan 8 Receiver 9 Expansion means 10 Evaporator 11 Vapor compression refrigeration cycle 12 Belt 13 Clutch 14 Ventilation duct 15 Outside air inlet 16 Inside air introduction port 17 Inside / outside air switching damper 18 Inside / outside air switching damper actuator 19 Blower fan 20 Evaporator outlet air temperature sensor 21 Heater core 22 Air mix damper 23 Air mix damper actuators 24, 25, 26 Damper 27 DEF outlets 28, 29 Outlet 30 Outlet control means 31 Air conditioning control device 32 Outside temperature sensor 33 Solar radiation sensor 34 Car interior temperature sensor 35 Humidity sensor 36 Engine speed sensor 37 High-pressure side refrigerant pressure signal 38 Evaporator outlet air temperature signal (evaporator temperature signal)
39 Clutch controller 40 Clutch control signal 41 Compressor capacity control signal 42 Air mix damper control signal 43 Inside / outside air switching damper control signal 44 Blower voltage signal

Claims (14)

  At least a vapor compression refrigeration cycle including a compressor that compresses refrigerant, a radiator that dissipates high-temperature and high-pressure refrigerant, and a refrigerant evaporator that cools air blown into the passenger compartment as a cooler. In a vehicle air conditioner having an outlet control means for selecting and controlling an outlet of conditioned air to be blown into a room, conditioned air from a DEF outlet from which a conditioned air is blown from the vicinity of a window glass in the passenger compartment of the plurality of outlets When the vapor compression refrigeration cycle is stopped from the operated state in the air-conditioning state in which the air is blown out, the air blowing from the DEF air outlet is prohibited by the air outlet control means for a predetermined time. Air conditioner.   The blowout from the DEF blowout outlet is prohibited by the blowout outlet control means, and after a predetermined time A has elapsed, the prohibition by the blowout outlet control means is canceled and the state of the blowout outlet before the prohibition is controlled. Vehicle air conditioner.   An outside air temperature detecting means for detecting or estimating a physical quantity correlated with the outside air temperature; and an inside / outside air switching means for adjusting an introduction ratio between the outside air and the inside air of the passenger compartment, and the predetermined time A is the outside air temperature The outside air temperature detected or estimated by the detecting means, the introduction ratio of the inside / outside air adjusted by the inside / outside air switching means, the outside air humidity, the rainfall state, the cabin temperature, the cabin humidity, before the operation of the vapor compression refrigeration cycle is stopped. The vehicle air conditioner according to claim 2, wherein the vehicle air conditioner is determined by referring to at least one of the temperature of the evaporator and the air temperature at the outlet of the evaporator.   The predetermined time A refers to at least one of the outside air temperature and outside air humidity, the introduction ratio of inside and outside air, the rainfall state, the vehicle interior temperature and the vehicle interior humidity, so that the dew point of the intake air of the evaporator The vehicle according to claim 3, wherein the vehicle is determined by estimating a temperature and referring to the temperature of the evaporator or the evaporator outlet air temperature before the operation of the vapor compression refrigeration cycle is stopped and the estimated dew point temperature. Air conditioner.   The predetermined time A refers to at least one of the outside air temperature and outside air humidity, the introduction ratio of inside and outside air, the rainfall state, the vehicle interior temperature and the vehicle interior humidity, so that the dew point of the intake air of the evaporator Estimating the temperature, referring to the temperature of the evaporator or the air temperature at the outlet of the evaporator before stopping the operation of the vapor compression refrigeration cycle, and the estimated dew point temperature, the vapor compression refrigeration cycle from the dew point temperature of the intake air 5. The predetermined time A is determined according to the reduced value when the value obtained by subtracting the evaporator temperature or the evaporator outlet air temperature before stopping the operation is a positive value. Air conditioner for vehicles.   The dew point temperature of the intake air of the evaporator is estimated by referring to at least one of the outside air temperature and the outside air humidity, or the introduction ratio of the inside and outside air, the rainfall state, or the cabin temperature and the cabin humidity, Reference is made to the temperature of the evaporator or the evaporator outlet air temperature before the operation of the vapor compression refrigeration cycle and the estimated dew point temperature, and from the dew point temperature of the suction air, the operation before the operation of the vapor compression refrigeration cycle is stopped. The vehicle air conditioner according to claim 4, wherein when the value obtained by subtracting the evaporator temperature or the evaporator outlet air temperature becomes a negative value, the prohibition of blowing from the DEF outlet is canceled.   When the vapor compression refrigeration cycle is stopped from the operating state in the air-conditioning state in which the conditioned air is blown from the DEF outlet, the evaporator temperature before the stop or the evaporator outlet air temperature is a predetermined value that is determined in advance. In the case of the above, the blowout prohibition control from the DEF blowout outlet by the blowout outlet control means is not performed, and when the evaporator temperature before the stop or the evaporator outlet air temperature is less than the predetermined value, The vehicle air conditioner according to claim 1, wherein the blowout prohibition control from the DEF outlet is performed by the outlet control means.   Furthermore, the air conditioner for vehicles of Claim 7 which implements the discharge prohibition control from the DEF blower outlet by the said blower outlet control means, when outside temperature is below predetermined value.   When there is a window glass temperature detecting means for detecting or estimating a physical quantity correlated with the window glass temperature, and the window glass temperature is equal to or less than a predetermined value, the blowout from the DEF outlet by the outlet control means The vehicle air conditioner according to claim 7, wherein prohibition control is performed.   10. When the transition from the state after the stop of the vapor compression refrigeration cycle to the operation state, the blow-off prohibition control from the DEF outlet is continued for a predetermined time B after the operation. Vehicle air conditioner.   It has a window glass temperature detecting means for detecting or estimating a physical quantity correlated with the window glass temperature, and when the window glass temperature is lower than the evaporator temperature or the evaporator outlet air temperature, it is predetermined after the operation of the vapor compression refrigeration cycle. During the time B, the blow-off prohibition control from the DEF blower outlet is continued. When the evaporator temperature or the evaporator outlet air temperature becomes lower than the window glass temperature, the blow-off prohibition control from the DEF blower outlet is canceled. The vehicle air conditioner according to claim 10, wherein normal control is performed.   When the compressor of the vapor compression refrigeration cycle can disconnect and connect the driving force by the power transmission mechanism from the drive source at any time, when the vapor compression refrigeration cycle is stopped from the operating state, The case of intermittently disconnecting and connecting the power transmission mechanism in order to control the temperature of the evaporator is not included, and is applied to cases other than intermittent disconnection and connection of the power transmission mechanism. The vehicle air conditioner according to any one of the above.   The vehicle air conditioner according to any one of claims 1 to 12, wherein the blow-off prohibition control from the DEF blow-out port is performed even when the drive source of the compressor of the vapor compression refrigeration cycle is stopped.   When the operation state of the vapor compression refrigeration cycle is changed from the cooling cycle mode to the heating cycle mode, it is considered that the refrigeration cycle is changed from the operated state to the stopped state, and the DEF outlet is operated for a predetermined time. The vehicle air conditioner according to any one of claims 1 to 13, wherein the blowout prohibition control from the vehicle is performed.

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