JP5164871B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to an air conditioner for a vehicle, and in particular, achieves power saving of the air conditioner, and further improves the comfort of passengers and prevents fogging of the window glass by providing reliable dehumidification in the passenger compartment. The present invention relates to a vehicle air conditioner.

  Japanese Patent Application Laid-Open No. H10-228707 proposes a technique for adjusting the discharge capacity of the variable capacity compressor in accordance with the humidity detected by the humidity detecting means installed in the passenger compartment. Further, Patent Document 2 proposes a technique for performing feedback control so that the humidity in the passenger compartment becomes the target humidity. However, since the so-called humidity sensor is a relative humidity sensor, its value depends on the air temperature. Therefore, controlling relative humidity to the target relative humidity is always affected by the air temperature. It is necessary to consider this, and it can be considered that the control becomes complicated.

JP 58-124139 A JP 2003-237341 A

  In the method of detecting the relative humidity as described above and controlling the evaporator temperature according to the relative humidity, the relative humidity that is optimum for the set temperature in the passenger compartment is referred to, and the relative humidity is set to the relative humidity. May be controlled. However, when the vehicle interior temperature is not the set temperature, the vehicle interior air temperature is controlled so that the vehicle interior air temperature becomes the set temperature, and the relative humidity depends on the vehicle interior air temperature, which is the air temperature. Therefore, there is a risk that proper control to the target humidity cannot be performed. Therefore, in spite of conditions that do not require dehumidification such as low air temperature and high relative humidity, lowering the temperature of the evaporator generates wasteful energy consumption, and the air temperature is high and the relative humidity is low. Although it is a condition that should be dehumidified as described above, it is conceivable that the passenger's comfort is impaired because it is not dehumidified, and that the window glass is fogged.

  Accordingly, an object of the present invention is to control the vehicle interior temperature by referring to the vehicle interior target dew point temperature in order to eliminate or reduce the above-described problems so that the vehicle interior humidity can be appropriately controlled. Thus, an object of the present invention is to provide a vehicle air conditioner which can improve passenger comfort and prevent fogging of the window glass.

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. An evaporator temperature detecting means having a vapor compression refrigeration cycle having a refrigerant evaporator and capable of detecting an evaporator outlet air temperature or an evaporator temperature; a target outlet for calculating a target outlet temperature into a vehicle compartment The dew point temperature in the vehicle interior is calculated from the temperature calculation means, the vehicle interior temperature detection means capable of detecting the vehicle interior temperature, the vehicle interior humidity detection means capable of detecting the vehicle interior humidity, the vehicle interior temperature and the vehicle interior humidity. In a vehicle air conditioner equipped with a vehicle interior dew point temperature calculating means and a vehicle interior temperature setting means capable of setting a vehicle interior temperature set value,
The vehicle interior humidity setting means is capable of setting the vehicle interior humidity setting value, the vehicle interior humidity set value set by the vehicle interior humidity setting means, and the vehicle interior temperature setting set by the vehicle interior temperature setting means. The vehicle interior dew point temperature target value calculating means capable of calculating the vehicle interior dew point temperature target value by referring to the vehicle interior dew point temperature target value calculated by the vehicle interior dew point temperature target value calculating means. And a vehicle interior dew point temperature correction value calculation means for calculating a deviation from the vehicle interior dew point temperature calculated by the vehicle interior dew point temperature calculation means, the vehicle interior dew point temperature correction value calculation means comprising: calculates the cabin dew point temperature correction value by subtracting the cabin dew point temperature from the value, the reference child car indoor target dew point temperature correction value obtained by adding the computed cabin dew point temperature correction value to the passenger compartment dew point temperature target value Accordingly, consisting of those and adjusting the amount of cooling of the evaporator.

  That is, the deviation between the vehicle interior dew point temperature target value calculated by the vehicle interior dew point temperature target value calculation means and the vehicle interior dew point temperature calculation means is calculated, and the vehicle interior dew point temperature is calculated based on the deviation. Calculate the correction value, refer to the vehicle interior dew point temperature correction value and the vehicle interior dew point temperature target value, and adjust the cooling amount of the evaporator so that the vehicle interior dew point temperature becomes the optimum dew point temperature. The indoor humidity is controlled to an appropriate humidity to prevent fogging of the window glass and to ensure passenger comfort.

A moving vehicle air-conditioning apparatus according to the present invention, the vehicle interior dewpoint temperature correction value calculating means calculates the vehicle interior dew point temperature correction value by subtracting the cabin dew point temperature from the cabin dew point temperature target value, the vehicle interior dewpoint The value obtained by adding the calculated vehicle interior dew point temperature correction value to the temperature target value is referred to as the vehicle interior target dew point temperature correction value, thereby adjusting the cooling amount of the evaporator . That is, the amount of cooling of the evaporator is adjusted so that the vehicle interior dew point temperature is controlled to the vehicle interior target dew point temperature correction value finally obtained. As a result, the humidity in the passenger compartment can be more reliably controlled to an optimal humidity to prevent the window glass from fogging, and passenger comfort can be ensured.

In the vehicle air conditioner having such a configuration, a value obtained by adding the vehicle interior dew point temperature correction value to the vehicle interior dew point temperature target value is set as the vehicle interior target dew point temperature correction value, and the vehicle interior target dew point temperature is set. Refer to the correction value and the evaporator outlet air temperature target value or the evaporator temperature target value set from the target outlet temperature calculated by the target outlet temperature calculating means, and select the smaller one to select the evaporator. It is possible to adjust the amount of cooling and control the blowing temperature of the conditioned air blown into the passenger compartment by the outlet temperature control means to air-condition the passenger compartment.

  Moreover, in the vehicle air conditioner provided with the above-described configuration, the glass has a glass temperature acquisition means capable of detecting or estimating the temperature of the window glass, and is calculated by referring to the acquired glass temperature. By calculating the dew point temperature value and referring to the vehicle interior target dew point temperature correction value, the evaporator outlet air temperature target value or the evaporator temperature target value, and the glass dew point temperature value, the cooling amount of the evaporator Can be adjusted.

  In this case, it has a glass temperature acquisition means that can detect or estimate the temperature of the window glass, calculates a glass dew point temperature value calculated by referring to the acquired glass temperature, and the glass dew point temperature value and the vehicle The glass dew point temperature correction value calculated by referring to the indoor dew point temperature, the vehicle interior target dew point temperature correction value, and the evaporator outlet air temperature target value or the evaporator temperature target value calculated from the target blowing temperature. The evaporator temperature control target value can be set by referring to the smallest one of them. The glass dew point temperature correction value can be a value obtained by subtracting the vehicle interior dew point temperature from the glass temperature and adding the glass dew point temperature value.

  Further, in the vehicle air conditioner having the above-described configuration, the outside air humidity detecting means capable of detecting or estimating the outside humidity of the passenger compartment and the outside air temperature detecting means capable of detecting or estimating the outside temperature of the passenger compartment. The vehicle outside dew point is calculated by referring to the outside air humidity detected or estimated by the outside air humidity detecting means and the outside air temperature detected or estimated by the outside air temperature detecting means. The amount of cooling of the evaporator can also be adjusted by referring to the deviation between the temperature and the vehicle interior dew point temperature. That is, the fogging of the window glass may occur due to the height relationship between the vehicle dew point temperature and the glass dew point temperature, or may occur due to the height relationship between the vehicle outside dew point temperature and the glass dew point temperature. In this case, the amount of cooling of the evaporator is adjusted using the deviation between the outside dew point temperature and the inside dew point temperature.

  According to the vehicle air conditioner of the present invention, the vehicle interior humidity is controlled based on the vehicle interior dew point temperature, not the detection value of the humidity sensor that directly detects the relative humidity, and therefore depends on the vehicle interior air temperature. Humidity can be reliably adjusted with a simple control method without complicated control, contributing to improving passenger comfort and more appropriately preventing fogging of the window glass. .

1 is an equipment system diagram of a vehicle air conditioner according to an embodiment of the present invention. It is a control block diagram which shows the example of control in this invention. It is a control flowchart which shows the example of control in this 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 a ventilation circuit and a refrigeration circuit (vapor compression refrigeration cycle) are provided. The vapor compression refrigeration cycle 11 is variably 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). The compressor 4 has a capacity compressor 4, and the compressor 4 is driven via a clutch 13 that controls transmission of driving force from the engine 1. The refrigeration cycle 11 is further discharged from a radiator 6 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 the compressor 4. High-pressure side pressure detecting means 5 for detecting the pressure of the high-pressure refrigerant at the outlet side of the radiator 6, a receiver 8 (receiver) for separating the high-pressure refrigerant flowing out of the radiator 6 into gas and liquid, and outflowing from the receiver 8 The expansion means 9 (expansion valve) for adiabatically expanding the refrigerant and the evaporator 10 for cooling the conditioned air sent by evaporating the refrigerant from the expansion means 9 are provided. , 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 (or an 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 air is blown out from the air outlets 27, 28, and 29 through the dampers 24, 25, and 26 toward the vehicle interior.

  Reference numeral 31 denotes an air conditioning control device. The air conditioning control device 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, and a vehicle interior temperature from the vehicle interior temperature sensor 34. A signal, a humidity signal from the humidity sensor 35, a high-pressure refrigerant pressure signal 36 from the high-pressure detector 5, and an evaporator outlet air temperature signal (evaporator temperature signal) 37 from the evaporator outlet air temperature sensor 20. Each is entered. From the air conditioning controller 31, a clutch control signal 39 is sent to the clutch controller 38 that controls the drive of the compressor 4, and a compressor capacity control signal 40 as an external signal that can control the capacity of the compressor 4 is sent to the compressor 4. An air mix damper control signal 41 is output to the air mix damper actuator 23, an inside / outside air switching damper control signal 42 is output to the inside / outside air switching damper actuator 18, and a driving voltage signal 43 (blower voltage signal) for the blower fan 19 is output. .

  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.

An example of a control block diagram for the vehicle air conditioner as described above is shown in FIG. 2, and an example of a control flow is shown in FIG. Below, it demonstrates centering around the control flow shown in FIG.
The vehicle interior temperature setting value (Tset) and the vehicle interior humidity setting value (Hset) are set by the vehicle interior temperature / humidity setting means.
-Car interior temperature (Tin), car interior humidity (Hin), outside air temperature (Tamb), and solar radiation (Rsun) are detected and read.
The vehicle interior dew point temperature target value (Tdset) is calculated by the vehicle interior dew point temperature target value calculation means by referring to the vehicle interior temperature set value (Tset) and the vehicle interior humidity set value (Hset).
The vehicle interior dew point temperature (Tdin) is calculated by referring to the vehicle interior temperature (Tin) and the vehicle interior humidity (Hin) by the vehicle interior dew point temperature calculation means.
The vehicle interior dew point temperature correction value calculation means calculates the vehicle interior dew point temperature correction value (Tde) from the vehicle interior dew point temperature target value (Tdset) and the vehicle interior dew point temperature (Tdin).
・ By referencing the vehicle interior dew point temperature target value (Tdset) and the vehicle interior dew point temperature correction value (Tde), the vehicle interior target dew point temperature correction value calculation means calculates the vehicle interior target dew point temperature correction value (Tdh). Calculated.

・ The target blowout temperature (Toc) is the same as the conventional air conditioning system. The target cabin temperature setting value (Tset), the cabin temperature (Tin), the outside air temperature (Tamb), and the amount of solar radiation. It is calculated by referring to (Rsun) etc. and is calculated by the following equation. Also, the evaporator outlet air temperature target value or the evaporator temperature target value (indicated as the evaporator temperature target value in the figure) (Toff) calculated from the target outlet temperature (Toc) is calculated. Is done.
Toc = f (Tset, Tin, Tamb, Rsun)
Toff = f (Toc)
-The glass temperature (Tglass) estimated or detected by the glass temperature acquisition means is acquired. Tglass = f (Tamb, Rsun)
The glass dew point temperature correction value calculation means calculates the glass dew point temperature correction value (Tgh) by referring to the vehicle interior dew point temperature (Tdin) from the glass temperature (Tglass).

Refer to the vehicle interior dew point temperature correction value (Tdh), the evaporator temperature target value (Toff), and the glass dew point temperature correction value (Tgh). The smallest value is the evaporator temperature control target value (Tet). To do. Therefore, in this example, the evaporator temperature control target value (Tet) is any one of the vehicle interior dew point temperature correction value (Tdh), the evaporator temperature target value (Toff), and the glass dew point temperature correction value (Tgh).
The evaporator temperature (Teva) is controlled so that the evaporator temperature control target value (Tet) is reached, and the cooling amount of the evaporator is adjusted.

  Here, in the case of a fixed capacity compressor system, the evaporator temperature is controlled by intermittent clutch engagement. In the case of a variable capacity compressor using an external signal, it is desirable to control the evaporator temperature using a capacity control signal. In the case of an electric compressor system, it is desirable to control the evaporator temperature by controlling the rotational speed.

  By such control, the amount of cooling of the evaporator is adjusted so that the vehicle interior dew point temperature becomes the optimum dew point temperature, the vehicle interior humidity is controlled to an appropriate humidity, and fogging of the window glass is prevented, Crew comfort is ensured.

  INDUSTRIAL APPLICABILITY The present invention can be applied to any vehicle air conditioner that includes a vehicle interior dew point temperature calculation means and performs conventional normal air conditioning control.

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 Dampers 27, 28, 29 Air outlet 31 Air conditioning control device 32 Outside air temperature sensor 33 Solar radiation sensor 34 Car interior temperature sensor 35 Humidity sensor 36 High-pressure side refrigerant pressure signal 37 Evaporator outlet air temperature signal (evaporator temperature signal)
38 Clutch controller 39 Clutch control signal 40 Compressor capacity control signal 41 Air mix damper control signal 42 Inside / outside air switching damper control signal 43 Blower voltage signal

Claims (6)

The vapor compression refrigeration cycle includes at least a compressor that compresses the refrigerant, a radiator that dissipates the high-temperature and high-pressure refrigerant, and an evaporator of the refrigerant that cools the air blown into the vehicle interior as a cooler. Evaporator temperature detecting means capable of detecting the outlet air temperature or evaporator temperature, target blowing temperature calculating means for calculating the target blowing temperature into the passenger compartment, vehicle interior temperature detecting means capable of detecting the passenger compartment temperature The vehicle interior humidity detecting means capable of detecting the vehicle interior humidity, the vehicle interior dew point temperature calculating means for calculating the vehicle interior dew point temperature from the vehicle interior temperature and the vehicle interior humidity, and the vehicle interior temperature set value can be set. In the vehicle air conditioner provided with the passenger compartment temperature setting means,
The vehicle interior humidity setting means is capable of setting the vehicle interior humidity setting value, the vehicle interior humidity set value set by the vehicle interior humidity setting means, and the vehicle interior temperature setting set by the vehicle interior temperature setting means. The vehicle interior dew point temperature target value calculating means capable of calculating the vehicle interior dew point temperature target value by referring to the vehicle interior dew point temperature target value calculated by the vehicle interior dew point temperature target value calculating means. And a vehicle interior dew point temperature correction value calculation means for calculating a deviation from the vehicle interior dew point temperature calculated by the vehicle interior dew point temperature calculation means, the vehicle interior dew point temperature correction value calculation means comprising: calculates the cabin dew point temperature correction value by subtracting the cabin dew point temperature from the value, the reference child car indoor target dew point temperature correction value obtained by adding the computed cabin dew point temperature correction value to the passenger compartment dew point temperature target value The air conditioner for a vehicle, characterized in that adjusting the amount of cooling of the evaporator. A value obtained by adding a vehicle interior dew point temperature correction value to the vehicle interior dew point temperature target value is used as a vehicle interior target dew point temperature correction value, and the vehicle interior target dew point temperature correction value and the target blowout temperature calculated by the target blowout temperature calculation means. Referring to the evaporator outlet air temperature target value or the evaporator temperature target value set from the temperature, the smaller one is selected to adjust the cooling amount of the evaporator, and the air is blown into the vehicle interior by the blowing temperature control means 2. The vehicle air conditioner according to claim 1 , wherein the temperature of the conditioned air is controlled to air-condition the passenger compartment. It has a glass temperature acquisition means capable of detecting or estimating the temperature of the window glass, calculates a glass dew point temperature value calculated by referring to the acquired glass temperature, and the vehicle interior target dew point temperature correction value, and the evaporator outlet air temperature target value or target evaporator temperature, by referring to said glass dew point temperature values, and adjusting the amount of cooling of the evaporator, according to claim 1 or 2 Vehicle air conditioner. It has a glass temperature acquisition means that can detect or estimate the temperature of the window glass, calculates a glass dew point temperature value calculated by referring to the acquired glass temperature, and the glass dew point temperature value and the vehicle interior dew point temperature With reference to the glass dew point temperature correction value calculated by referring to, the vehicle interior target dew point temperature correction value, and the evaporator outlet air temperature target value or the evaporator temperature target value calculated from the target blowing temperature, The vehicle air conditioner according to claim 3 , wherein the evaporator temperature control target value is set by using the smallest one of them. 5. The vehicle air conditioner according to claim 4 , wherein the glass dew point temperature correction value is a value obtained by subtracting a vehicle interior dew point temperature from a glass temperature and adding the glass dew point temperature value. 6. Further, the outside air humidity detecting means capable of detecting or estimating the outside humidity of the passenger compartment and the outside air temperature detecting means capable of detecting or estimating the outside temperature of the passenger compartment, the outside air humidity detected or estimated by the outside air humidity detecting means. And an outside air temperature detected or estimated by the outside air temperature detecting means to calculate a vehicle exterior dew point temperature, refer to a deviation between the vehicle interior dew point temperature and the vehicle interior dew point temperature, and The vehicle air conditioning apparatus according to any one of claims 3 to 5 , wherein the cooling amount of the vehicle is adjusted.

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