JPH07285312A - Air conditioner and air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To surely control air conditioning regardless of the aging change of a humidity sensor when controlling the air conditioning in a room based on the humidity detected by the humidity sensor. CONSTITUTION:A control device 22 drives a compressor 8 in response to the environmental condition, cools an evaporator 6 to a prescribed temperature, adjusts the aperture of an air mix damper 12, and generates conditioned air. The control device 22 estimates the humidity in a car room by the prescribed arithmetic equation when the temperature detected by an outside air temperature sensor 27 is a set temperature or above and the evaporator 6 is cooled to 3 deg.C, for example. Air is saturated when high-temperature air is cooled, and the absolute temperature can be determined based on it. The humidity in the car room can be accurately determined based on the equilibrium state between the steam quantity contained in the air fed into the car room through the evaporator 6 and the steam quantity discharged to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner and a vehicle air conditioner for controlling air conditioning in a room in accordance with humidity detected by humidity detecting means.

[0002]

2. Description of the Related Art Conventionally, for example, an air conditioner for a vehicle has been provided which executes air conditioning control based on the humidity detected by a humidity sensor as a humidity detecting means for detecting the humidity in the vehicle compartment. In an air conditioner using such a humidity sensor, it is possible to maintain a comfortable air conditioning environment inside the vehicle regardless of the environment outside the vehicle or the number of passengers.
It is possible to remove fogging (anti-fog) on the window glass while saving power.

[0003]

By the way, there are two major factors that reduce the detection accuracy of the humidity sensor.
One is the variation for each product, and the other is the change over time. In this case, variations in each product can be dealt with by improving the quality or adjusting the characteristics when the product is completed. On the other hand, with respect to changes over time, the characteristics of the changes differ depending on the environmental conditions (sensor contamination) in which the humidity sensor is used and the passage of time (high temperature, high humidity cycle, etc.). It is difficult to correct the detected humidity. For this reason, in the above-mentioned conventional example, there is a possibility that it may not be possible to maintain a comfortable air-conditioning environment inside the vehicle due to fluctuations in the detection characteristics due to changes over time in the humidity sensor. The fact that the humidity detected by the humidity sensor deviates from the true value in this way means that the air conditioning control based on the humidity detected by the humidity sensor cannot be properly executed, power saving cannot be achieved, and the window glass becomes cloudy. It means that it cannot be removed reliably.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the humidity detecting means from changing with time in a structure in which the air conditioning of the room is controlled based on the humidity detected by the humidity detecting means for detecting the indoor humidity. An object of the present invention is to provide an air conditioner capable of reliably controlling the air conditioning, and a vehicle air conditioner capable of reliably preventing the window glass from becoming fogged while saving power.

[0005]

The air conditioner of the present invention is provided with a dehumidifying means for dehumidifying the air blown into the room by cooling, and a humidity detecting means for detecting the humidity in the room, which is detected by the humidity detecting means. Dehumidification control means for controlling the cooling temperature of the dehumidification means based on humidity is provided, and humidity estimation means for estimating the humidity in the room by a predetermined arithmetic expression when a predetermined condition is established, and detection by the humidity detection means Correction means for correcting the humidity detected by the humidity detection means used by the dehumidification control means based on the difference between the humidity and the humidity estimated by the humidity estimation means is provided.

In this case, the humidity estimating means may estimate the indoor humidity when the air cooled by the dehumidifying means becomes saturated.

Further, an outside air temperature detecting means for detecting the temperature outside the room is provided, and the humidity estimating means is used when the temperature detected by the outside air temperature detecting means is a predetermined value or more and the dehumidifying means is cooled to a predetermined temperature. It may be determined that the air cooled by the dehumidifying means is saturated.

Further, the correction means corrects the humidity detected by the humidity detecting means when the difference between the humidity detected by the humidity detecting means and the humidity estimated by the humidity estimating means exceeds a predetermined value. Good.

Further, the dehumidification control means can be switched to an outside air mode for dehumidifying the outdoor air by the dehumidification means and blowing the air indoors or an inside air mode for dehumidifying the indoor air by the dehumidification means and blowing the air indoors. The humidity estimating means may be configured to select an arithmetic expression for estimating the humidity according to the outside air mode or the inside air mode.

In the vehicle air conditioner of the present invention, any one of the above air conditioners is mounted on the vehicle, and the dehumidification control means is arranged to adjust the humidity in the vehicle compartment to such a value that the window glass of the vehicle is not fogged. The dehumidifying means is cooled to a predetermined temperature.

[0011]

In the air conditioner according to the present invention, the dehumidifying control means controls the cooling temperature of the dehumidifying means based on the humidity detected by the humidity detecting means. As a result, the air blown into the room is cooled and dehumidified by the dehumidifying means, so that the room is dehumidified. Now, when the predetermined condition is satisfied, the dehumidification estimating means estimates the indoor humidity by a predetermined arithmetic expression. Then, the correction means corrects the humidity detected by the humidity detection means used subsequently by the dehumidification control means based on the difference between the humidity detected by the humidity detection means and the estimated humidity by the humidity estimation means. Therefore, even if the humidity detected by the dehumidification detecting unit changes due to aging, the humidity detected by the change can be corrected, and therefore the humidity control unit surely dehumidifies based on the humidity detected by the humidity detecting unit. The means can be cooled to a predetermined temperature.

In the air conditioner according to the second aspect, when the air blown into the room becomes saturated due to the cooling by the dehumidifying means, the absolute humidity at that time can be obtained. The amount of water vapor contained can be accurately determined. Therefore, the humidity estimating means can accurately estimate the indoor humidity based on the equilibrium state between the amount of water vapor supplied to the room and the amount of water vapor exhausted to the outside.

In the air conditioner according to the third aspect of the present invention, when the outside air temperature is high, the relative humidity of the blast air into the passenger compartment is high, so when the blast air is cooled by the dehumidifying means under such environmental conditions. It becomes saturated. Therefore, the humidity estimating means can consider that the blast air dehumidified by the dehumidifying means is saturated under the environmental condition that the outside air temperature is high.

In the air conditioner according to the present invention, the correcting means corrects the humidity detected by the humidity detecting means when the difference between the humidity detected by the humidity detecting means and the humidity estimated by the humidity estimating means becomes a predetermined value or more. Therefore, the humidity detecting means can be effectively corrected only when the detection accuracy of the humidity detecting means is significantly reduced.

In the air conditioner according to the fifth aspect, the humidity estimating means is an outside air mode in which the outdoor air is dehumidified by the dehumidifying means and blown into the room, or the inside air which dehumidifies the indoor air by the dehumidifying means and blows the air. Since the calculation formula for estimating the indoor humidity is selected according to the mode, the humidity can be reliably estimated according to the outside air mode or the inside air mode which are different environmental conditions.

In the case of the vehicle air conditioner according to the sixth aspect of the invention, since each of the air conditioners is mounted on the vehicle, the interior of the vehicle is controlled by the dehumidifying means by the dehumidifying control means regardless of the secular change of the humidity detecting means. Air conditioning can be reliably performed. At this time, the dehumidification control means cools the dehumidifying means to a predetermined temperature so that the humidity in the vehicle compartment does not fog the window glass of the vehicle, so that the window glass of the vehicle becomes fogged based on the humidity detected by the humidity detecting means. It can be surely prevented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to an automobile air conditioner will be described below with reference to FIGS. FIG. 1 shows an overall functional block configuration. In an air duct 1 arranged in the front part of a vehicle compartment (not shown), an inside / outside air switching damper 2 is rotatably provided at an upstream side inlet thereof, and a downstream side thereof is provided. Is equipped with a blower 3. The inside / outside air switching damper 2 is driven by a servo motor 2a, and switches the air intake port to either the inside air introducing port 4a or the outside air introducing port 4b. The blower 3 is rotationally driven by a blower motor 5, sucks air from the side where either the inside air inlet 4a or the outside air inlet 4b is set, and blows the air to the downstream side.

The evaporator 6 as a dehumidifying means is arranged on the downstream side of the blower 3, cools the air sent by the blower 3 and sends it to the downstream side, and is one of the elements constituting the refrigeration cycle 7. is there. The refrigeration cycle 7 includes the evaporator 6, the compressor 8, the condenser 9, and the receiver 1.
It is formed so that the refrigerant circulates through the evaporator 6 through the 0 and the expansion valve 11, and the cooling function of the evaporator 6 can be obtained by operating the compressor 8.

The air mix damper 12 is rotatably provided on the downstream side of the evaporator 6 and has a servo motor 12a.
Driven by. A heater core 13 as a heating unit is arranged downstream of the air mix damper 12 so as to occupy a part of the air duct 1. The heater core 13 heats air by using engine cooling water (not shown) as a heat source, and heats cold air sent from the evaporator 6. The air mix damper 12 distributes the cool air sent from the evaporator 6 to the heater core 13 and the bypass passage 14 according to the opening degree set by the servo motor 12a.

On the outlet side of the air duct 1, there are provided three defrost outlets 15, a face outlet 16 and a foot outlet 17, which correspond to the defrost outlet damper 18 and the face outlet. Exit damper 19
Also, a foot outlet damper 20 is provided. The outlet dampers 18 to 20 are servomotors 18a to 20a, respectively.
Driven by.

The defrost outlet 15 is arranged toward the surface of the window glass 21 on the inside of the vehicle compartment, and the servo motor 1 is provided.
By opening the defrost outlet damper 18 by 8a, it becomes possible to blow air to the window glass 21.

The control device 22 having the functions of the dehumidification control means, the humidity estimation means and the correction means includes a CPU 22a,
The ROM 22b and the RAMs 22c and 22d are included. Here, the ROM 22b stores in advance an automatic air-conditioning control program for air-conditioning control and a target outlet temperature at which the compressor 8 can be stopped in accordance with an outside air temperature and an outside air humidity described later. In this case, the RAM 22d stores a correction value described later, and backs up the correction value stored by a battery (not shown).

The output terminals A to E of the controller 22 are connected to the servomotors 2a, 12a, 18a and 19 respectively.
a, 20a, and the output terminal F is connected to the blower motor 5 via the drive circuit 5a. Servo motor 1
An air mix damper opening sensor 12b for detecting the opening θ of the air mix damper 12 is provided at 2a and is connected to an input terminal G of the control device 22.

The output terminal H of the control device 22 is connected to an electromagnetic clutch (not shown) of the compressor 8 via a drive circuit 8a, and the coil of the electromagnetic clutch is energized to rotate the engine. Is transmitted to drive the compressor 8. The drive circuit 8a has a function of detecting a current flowing through the coil of the electromagnetic clutch, and its output terminal is connected to the input terminal I of the control device 22.

The input terminals J to L of the control device 22 are connected to an inside / outside air changeover switch 23, a temperature setting switch 24 and a defrost mode setting switch 25 arranged on an operation panel (not shown), and the input terminals M to R are connected to each other. They are connected to an inside air temperature sensor 26, an outside air temperature sensor 27 as an outside air temperature detecting means, a water temperature sensor 28, a solar radiation sensor 29, an evaporator sensor 30, and an inside air humidity sensor 31 as an inside air humidity detecting means, respectively.

The inside air temperature sensor 26 and the outside air temperature sensor 2
Reference numeral 7 respectively detects the temperatures Tr and Tam inside and outside the vehicle, the water temperature sensor 28 detects the cooling water temperature Tw of the engine, the solar radiation sensor 29 detects the solar radiation amount Ts incident on the vehicle interior, and the indoor air humidity sensor. 31 is the relative humidity RHr in the passenger compartment
To detect.

Next, the operation of this embodiment will be described with reference to FIGS. When the power supply is turned on and the air conditioning control program is started, the control device 22 executes control according to the flowchart of FIG. That is, the control device 22 first performs an initialization process in step S1 to initialize various counters and flags, and then in step S1.
Move to 2.

The control unit 22 determines in step S2 that
Read the set temperature Tset from the temperature setting switch 24, and
It is stored in the AM 22c. Subsequently, in step S3, the control device 22 reads detection signals from various sensors to detect the vehicle environmental condition. That is, the control device 22
The inside air temperature (room temperature) Tr from the inside air temperature sensor 26, the outside air temperature Tam from the outside air temperature sensor 27, the engine cooling water temperature Tw from the water temperature sensor 28, the insolation amount Ts from the solar radiation sensor 29,
From the evaporator sensor 30 to the outlet temperature Te of the evaporator 6, from the inside air humidity sensor 31 to the relative humidity RHr in the vehicle compartment
Is read and stored in the RAM 22c.

Next, in step S4, the control device 22 determines the ROM 22b based on the read various data.
Target air temperature TAO
To calculate. In this case, the data set temperature Tset
, The inside air temperature Tr, the outside air temperature Tam, and the amount of solar radiation Ts are used to obtain the above-mentioned target outlet air temperature TAO by substituting it into the arithmetic expression shown in the following equation (1). TAO = A * Tset + B * Tr + C * Tam + D * Ts + E (1) where A to E are arbitrary constants for setting the gain.

[0030]

Next, in step S5, the controller 22 shows the blower voltage Ve in FIG. 5 based on the set temperature Tset read and stored in steps S2 and S3 and the detection signals from various sensors for detecting the environmental condition. Set according to control characteristics. The blower voltage Ve is a voltage applied to the blower motor 5 via the drive circuit 5a in order to set the amount of air blown by the blower 3.

Next, the control device 22 determines the inlet mode and the outlet mode according to the control characteristics shown in FIGS. 6 and 7, respectively (steps S6 and S7). Then, the control device 22 executes a correction value calculation process (step S8).
This correction value calculation processing is for correcting the secular change of the humidity sensor 31. In this case, since the detection accuracy of the humidity sensor 31 is good at the beginning of use of the humidity sensor 31, the control device 22 does not correct the detection value of the humidity sensor 31 by the correction value calculation process of step S8. Therefore, the control device 22 uses the detected value of the humidity sensor 31 as it is for the air conditioning control in the subsequent control.

When the control device 22 goes to step S9,
ROM2 based on various data stored in RAM22c
The target opening θo of the air mix damper 12 is calculated by an arithmetic expression previously stored in 2b. In this case, as the data, the target outlet temperature TAO, the cooling water temperature Tw, and the outlet temperature Te of the evaporator 6 are used, and the target opening degree of the air mix damper 12 is calculated by substituting them into the arithmetic expression shown in the following equation (2). Find θo. θo = [(TAO-Te) / (Tw-Te)] × 100 (%) (2)

Next, in step S10, drive / stop processing of the compressor 8 is performed. Then, based on the results obtained in the above steps, a control signal is output in step S11 to control the air conditioning in the vehicle compartment. In this case, the control device 22 gives a blower drive signal to the drive circuit 5a to drive the blower motor 5 at the blower voltage Ve, thereby operating the blower 3 with a predetermined air flow rate. In addition, the control device 22
Sends the air mix damper opening control signal to the servo motor 1
2a, and the opening degree θ of the air mix damper 12 is controlled to be the target opening degree θo calculated in step S6.
Further, the control device 22 outputs an inside / outside air introduction mode control signal to the servomotor 2a to drive the inside / outside air switching damper 2 to a predetermined position.

Subsequently, the control device 22 then proceeds to step S
The process shifts to 12 and waits until a predetermined control period τ elapses, after which the above steps are repeated again. Therefore, the control device 22 repeatedly executes the above-mentioned program at regular intervals, whereby the set temperature Tset is set.
Also, the air conditioning control is performed according to the vehicle environment state to keep the vehicle interior comfortable.

Now, the drive / stop processing of the compressor 8 performed in step S10 in the state where the air conditioning control is performed in this manner will be described. FIG. 3 shows the drive / stop processing of the compressor 8. In FIG. 3, the control device 22 sets the outlet set temperature of the evaporator 6 (hereinafter, referred to as “temperature adjustment control”, “comfort humidity control”, and “anti-fog control”) in step T1.
Calculated as the post-evaporator set temperature).

Here, the temperature control is control for driving the compressor 8 so as to reach the post-evaporator set temperature TE1 according to the target outlet temperature TAO as shown in FIG. Further, the comfortable humidity control is to drive and stop the compressor 8 so as to reach the post-evaporator set temperature TE2 according to the vehicle interior humidity as shown in FIG. 9, and when the vehicle interior humidity exceeds the upper limit set value. Drives the compressor 8 to perform dehumidifying operation,
When the vehicle interior humidity is below the lower limit set value, the compressor 8
Is a control to stop. The anti-fogging control is a control for driving the compressor 8 so as to reach the post-evaporation set temperature TE3 when the vehicle interior humidity reaches the clouding limit indoor humidity with respect to the outside air temperature. FIG. 10 shows the fogging limit indoor humidity characteristic (room temperature 25 ° C.) with respect to the outside temperature.

Now, the controller 22 controls the post-evaporator set temperature obtained as described above, that is, TE1 for adjusting the temperature,
The control content for the compressor 8 thereafter is determined according to the smallest value of TE2 for maintaining comfortable humidity and TE3 for anti-fogging. That is, in order to properly execute all the control of temperature adjustment, comfortable humidity maintenance, and antifogging, the compressor 8 is driven so that the post-evaporator set temperature becomes the minimum value of TE1 to TE3 obtained in step T1. It is necessary.

Therefore, the controller 22 first compares the minimum value of TE1, TE2 and TE3 with the current post-evaporator set temperature TE in step T2. At this time, when the current post-evaporator set temperature TE is larger than the minimum value, it is necessary to change the setting of the post-evaporator set temperature TE. Therefore, after setting t = 0 in step T3, steps T4 to T4 are performed. At T6, the minimum value is selected from TE1, TE2 and TE3. At this time, when TE1 for temperature adjustment is the minimum value, it is determined in step T7 whether the target outlet temperature TAO is higher than the predetermined temperature α above the outside air temperature TAM which is the intake temperature of the air duct 1. , TAO> TAM + α, the stop process of the compressor 8 is executed in step T8.

That is, when the outside air passes through the air duct 1, the ambient temperature raises the temperature by a predetermined temperature α (for example, 5 ° C.), so that the target outlet temperature TAO is higher than the outside air temperature by a predetermined temperature. When TAO> TAM + α, the compressor 8 can be stopped. If TAO> TAM + α is not satisfied in step T7, TE1 is set to TE in step T9.

On the other hand, when TE2 for maintaining comfortable humidity is minimum, TE2 is set to TE2 in step T10, and when TE3 for anti-fogging is minimum, step T1 is set.
In 1, TE is set to TEmin (for example, 3 ° C.).
Then, after setting the post-evaporator set temperature TE, the control device 22 executes the drive process of the compressor 8 in step T12.

After setting the post-evaporator set temperature TE as described above, the control device 22 returns to the main routine to control the compressor 8 so that the set post-evaporator temperature TE is reached. When the control period τ elapses,
The drive / stop processing of the compressor 8 is executed again. At this time, in the previous drive / stop processing of the compressor 8, when TEmin is set as the post-evaporator set temperature TE, the control device 22 determines “YES” in step T2.
Then, the anti-fog standby operation is executed.

In this anti-fog standby operation, first, step T
At 13, it is determined whether t> tmax (for example, 300 sec). At this time, since t = 0, the control cycle τ in the main routine is counted up by setting t = t + τ in step T14, and then the drive / stop processing of the compressor 8 is executed in step T15. When t> tmax due to the repeated driving / stopping process of the compressor 8, t = 0 is set in step T16 and TE is set to the minimum value of TE1, TE2 and TE3 in step T17. After that, the drive / stop processing of the compressor 8 is executed.

Now, as described above, the inside air humidity sensor 31
The reason for controlling the humidity inside the vehicle by using the detected value by
One is to maintain a comfortable air-conditioning environment inside the vehicle,
The other is to ensure the safety of the passenger compartment. That is, in general, the comfortable humidity range for humans is 20 to 60 in relative humidity.
%, It is necessary to dehumidify it so that the relative humidity is 60% or less. Fogging of the window glass 21 of the vehicle occurs because warm air in the vehicle compartment touches the inner surface of the low-temperature window glass 21 and becomes saturated, so that the absolute humidity in the vehicle compartment changes to the inner surface temperature of the window glass 21. Correspondingly, it is necessary to maintain the humidity inside the vehicle compartment so that it is below the absolute humidity at which it becomes saturated.

By the way, if the air conditioner is used for a long period of time, the humidity sensor 31 may have its detected value fluctuating from the true value (relative humidity in the passenger compartment) due to dirt or a cycle of high temperature and high humidity environment. become. Specifically, it is known that the humidity sensor 31 has a detected value that changes by 10% in about 5 years. If the detection accuracy of the humidity sensor 31 deteriorates in this way, the air conditioning control for the vehicle interior by the control device 22 becomes inadequate. At this time, when the detected value by the humidity sensor 31 fluctuates to the higher humidity side than the true value, the control device 2
In No. 2, it is determined that cooling is necessary even though cooling is not necessary, and the drive rate of the compressor 8 is increased. For this reason, the drive rate of the compressor 8 is increased and the power saving effect is reduced. In the worst case, the compressor 8 is always driven, and the power saving effect is significantly reduced. When the value detected by the humidity sensor 21 is lower than the true value, the control device 22 determines that cooling is not necessary even though cooling is necessary, and reduces the drive rate of the compressor 8.
For this reason, not only does the passenger compartment become uncomfortable due to the increased humidity in the passenger compartment, but also the window glass 21 becomes cloudy and the safety is reduced.

Therefore, in this embodiment, the air-conditioning control is performed reliably by preventing the influence of the deterioration of the detection accuracy due to the secular change of the humidity sensor 31 as follows.
That is, when executing the correction value calculation process shown in FIG. 4, the control device 22 is under the condition that the outside air temperature is equal to or higher than the set temperature and the compressor 8 is turned on (steps U1, U2),
Further, when the outlet set temperature of the evaporator 6 is controlled to be 3 ° C. (step U3), the inside air temperature sensor 26
The vehicle interior temperature TR is detected by the above, and the difference between the vehicle interior temperature TRn detected this time and the vehicle interior temperature TRn-1 detected last time is obtained, and it is determined whether or not the temperature difference is within a predetermined value (step U4). ). At this time, the control device 22 controls the passenger compartment temperature TR
When the amount of change in is small, it is considered that the air conditioning environment in the vehicle compartment is balanced.

When the outside air mode is set (step U5), the control device 22 determines that the environmental condition for accurately estimating the vehicle interior humidity is satisfied, and the absolute humidity RHC of the vehicle interior will be described later. The absolute humidity is converted into the relative humidity RHC '(step U6). In this case, in order to convert the absolute humidity into the relative humidity, the well-known moist air diagram is used as a table for RO.
It is stored in M22b and the relative humidity corresponding to the absolute humidity is obtained based on the table.

Subsequently, the controller 22 determines whether or not the humidity difference between the calculated relative humidity RHC 'and the relative humidity RHR detected by the humidity sensor 31 is a predetermined value α or more (step U7). . At this time, when the humidity difference between the two is greater than or equal to the predetermined value α, the control device 22 determines that the detection accuracy of the humidity sensor 31 is deteriorated, and β = (R
HC-RHR) · γ to calculate the correction value β and RAM2
It is stored in 2d (step U8). In this case, γ is a correction coefficient, and when this correction coefficient γ is set to 1,
This means that RHC-RHR is set as a correction value. Therefore, the correction coefficient γ is 1 or less, preferably 0.5.
It is desirable to set them before and after so that RHC-RHR does not greatly affect the correction value β. This is to prevent the influence of this error because the error from the true humidity cannot be avoided although the reliability of the vehicle interior humidity calculated under a predetermined environmental condition is high. In this case, of course, the correction coefficient γ may be set to 1 when the reliability of the vehicle interior humidity obtained by calculation under a predetermined environmental condition is extremely high.

Then, as described above, the humidity sensor 31
The control device 22 that has obtained the correction value for the detection value of RH is the value RH obtained by correcting the detection value RHR by the humidity sensor 31 in the subsequent control by the arithmetic expression RHr = RHR + β.
Use r as the true humidity for air conditioning control.

The reason why the vehicle interior humidity can be calculated in step U6 will be described. That is, in the outside air introduction state, all of the outside air introduced as shown in FIG. 11 passes through the evaporator 6 and is then blown into the vehicle interior. At this time, when the temperature of the evaporator 6 is set to 3 ° C., the high temperature outside air passing through the evaporator 6 is cooled and always becomes saturated. Then, the air thus saturated becomes the heater core 13
And is mixed with the cold air that has passed through the bypass passage 14 and is blown into the vehicle interior. At this time, the air cooled by the evaporator 6 and saturated is heated by the heater core 13.
Even if the volume is increased by being heated by, the increase rate is small, so the absolute humidity of the air blown into the vehicle compartment can be regarded as the absolute humidity of the air cooled by the evaporator 6. Therefore, assuming that the absolute humidity of the saturated air cooled by the evaporator 6 (the amount of water vapor per 1 kg of dry air) is Xe, and the amount of air blown into the vehicle interior per unit time (airflow of the air conditioner) is Go, the vehicle introduced by the outside air is introduced. The amount of water vapor per unit time in the room can be calculated by Go · Xe. In this case, since the air passing through the evaporator 6 is cooled to 3 ° C. and saturated, the absolute humidity Xe of the blown air at that time is 0.0048 Kg.

Further, the humidity in the passenger compartment is also humidified by the sweat of the passengers. When the number of passengers is M and the amount of humidification by sweating per person is W, the humidity of the passengers per unit time is humidified into the passenger compartment. The amount can be calculated by WM.
Therefore, the amount of humidification per unit time in the passenger compartment is Go.
It can be calculated by Xe + W · M.

On the other hand, the amount of air blown into the passenger compartment is G
Since the same amount as o is exhausted to the outside of the vehicle, assuming that the absolute humidity inside the vehicle is RHC, the amount of water vapor released to the outside of the vehicle per unit time is G
o Can be calculated by RHC.

Here, in a state where the passenger compartment is balanced, it can be considered that the amount of steam supplied to the passenger compartment and the amount of steam released to the outside of the passenger compartment are equal in a unit time, and this is expressed by an equation. And Go ・ Xe + W ・ M = Go
・ It becomes RHC. Therefore, the absolute humidity RHC in the vehicle compartment when the vehicle interior is balanced is RHC = (Go * Xe + W * M) / Go Go: Air-conditioner air volume Xe: Absolute humidity of air passing through the evaporator W: Crew humidification M: Crew It can be represented by a number (assuming two people). In this case, since the air conditioner air volume is generally set to the minimum air volume when the vehicle compartment is in a balanced state, compared with the case where the air conditioner air volume is large and the vehicle interior ventilation is large, Is less disturbed and errors due to calculation can be prevented. Also, when the number of occupants changes to 1 to 5, the amount of humidification by the occupants changes by about 7%, but the number of people currently using the vehicle is about 1.
Since there are 7 people, assuming 2 passengers,
The calculation error can be stopped at about -2% to 5%.

According to the above configuration, the detection accuracy of the humidity sensor 31 is determined to be low and the detection accuracy is low based on the humidity in the vehicle compartment that is calculated when a predetermined environmental condition is reached. If it is determined that the humidity sensor 31
Since a correction value for correcting the detection value of is calculated and the detection value of the humidity sensor 31 is corrected based on the correction value in the subsequent control, the air conditioning control is simply performed based on the detection value of the humidity sensor. Unlike the conventional example that is performed, the air conditioning control can be reliably performed regardless of the secular change of the humidity sensor 31.

Further, as described above, the accurate determination of the humidity in the vehicle compartment regardless of the aging of the humidity sensor 31 means that the compressor 8 can be driven at an appropriate timing when antifogging is required. I mean. Therefore, it is possible to reliably prevent fogging of the window glass 21 while executing the energy saving operation.

FIG. 12 shows a correction value calculation process in the second embodiment of the present invention. The same steps as those in the first embodiment are designated by the same steps and the description thereof will be omitted. That is, when the inside air mode is set in step U5, the control device 22 estimates the humidity inside the vehicle compartment by the following arithmetic expression for the inside air mode. This is because, in the inside air mode, the outside air is not forcibly introduced and the air in the vehicle compartment is ventilated only by natural ventilation, and therefore the arithmetic expression used in the outside air mode cannot be used.

Here, the arithmetic expression for the inside air mode is RHC = (Go '* Xo + Gi * Xe + W * M) / (Gi +
Go ') Go': It can be expressed as the amount of natural ventilation in the vehicle compartment in the inside air mode Xo: The absolute humidity of the outside air Gi: The air flow rate of the air conditioner in the inside air mode. That is, in the inside air mode, although the outside air is not introduced into the vehicle compartment through the duct 1, it is blown into the vehicle compartment through the packing of the door and the like and is exhausted at the same time, so that the air in the vehicle compartment is naturally ventilated. It has been empirically found that the natural ventilation amount is a value (cubic m / h) obtained by halving the vehicle speed (Km / h). Further, in the inside air mode, the air in the passenger compartment passes through the evaporator 6 and is blown into the passenger compartment, so that the amount of water vapor supplied to the passenger compartment is also Go'.Xo together with the amount of humidification from the passenger. It can be calculated by + Gi.Xe + W.M. On the other hand, the amount of water vapor discharged to the outside of the vehicle compartment can be obtained by (Gi + Go ') RHC because it is natural ventilation and forced exhaust (indoor circulation) in the inside air mode.

The present invention is not limited to the above embodiments, but can be modified or expanded as follows. As the timing for estimating the vehicle interior humidity, it may be a requirement to determine that it is summer based on a calendar. A condition in which the vehicle interior temperature is close to the set temperature may be a requirement for determining that the vehicle interior is balanced. An occupant number detecting means for detecting the occupant number may be provided, and the occupant number obtained by the occupant number detecting means may be used for the humidity estimation.

[0059]

As is apparent from the above description, the air conditioner and the vehicle air conditioner of the present invention have the following effects. According to the first aspect of the present invention, the indoor humidity is estimated by a predetermined arithmetic expression when a predetermined condition is satisfied, and is used thereafter based on the difference between the estimated humidity and the humidity detected by the humidity detecting means. Since the humidity detected by the humidity control means is corrected, it is possible to reliably control the air conditioning regardless of the secular change of the humidity detection means in the configuration in which the air conditioning is controlled based on the humidity detected by the humidity detection means for detecting the indoor humidity. You can

According to the second aspect of the present invention, when the air blown into the room is cooled by the dehumidifying means to reach a saturated state, the humidity in the room is estimated to be included in the air blown into the room. Since the amount of water vapor is accurately obtained, the indoor humidity can be accurately estimated.

According to the third aspect of the present invention, when the air blown into the room is cooled by the dehumidifying means when the outside air temperature is high, the blown air becomes saturated, so the air blown by the dehumidifying means is dehumidified. Air can be considered saturated.

According to the fourth aspect of the present invention, the value detected by the humidity detecting means is corrected when the difference between the humidity detected by the humidity detecting means and the estimated humidity by the humidity estimating means exceeds a predetermined value. Therefore, the humidity detecting means can be effectively corrected only when the detection accuracy of the humidity detecting means is significantly reduced.

According to the fifth aspect of the present invention, the calculation formula for estimating the humidity is selected according to the outside air mode or the inside air mode, so that the outside air mode or the inside air mode which is a different environmental condition can be surely selected. Humidity can be estimated.

According to the sixth aspect of the present invention, each of the air conditioners is mounted on a vehicle, and the dehumidifying control means controls the dehumidifying means so that the humidity in the vehicle compartment is such that the window glass of the vehicle is not fogged. Therefore, it is possible to reliably prevent the window glass of the vehicle from becoming cloudy while saving power based on the humidity detected by the humidity detecting means.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration in a first embodiment of the present invention.

FIG. 2 is a flowchart showing the main operation of the control device.

FIG. 3 is a flowchart showing a drive stop processing operation of the compressor of the control device.

FIG. 4 is a flowchart showing a correction value calculation processing operation of the control device.

FIG. 5 is a characteristic diagram showing a relationship between a blower voltage and a target outlet temperature.

FIG. 6 is a characteristic diagram showing a relationship between a target outlet temperature and an inlet mode.

FIG. 7 is a characteristic diagram showing the relationship between the target outlet temperature and the outlet mode.

FIG. 8 is a characteristic diagram showing a relationship between a target outlet temperature and a post-evaporator set temperature.

FIG. 9 is a characteristic diagram showing a relationship between a vehicle interior humidity and a post-evaporator set temperature.

FIG. 10 is a characteristic diagram showing the cloudy limit indoor temperature with respect to the outside air temperature.

FIG. 11 is a diagram showing ventilation in the vehicle interior when the vehicle interior is balanced.

FIG. 12 is a view corresponding to FIG. 4 showing a second embodiment of the present invention.

[Explanation of symbols]

1 is a duct, 6 is an evaporator (dehumidifying means), 21 is a window glass, 22 is a control device (dehumidifying control means, humidity estimating means, correcting means), 27 is an outside air temperature sensor (outside air temperature detecting means), and 31 is a humidity sensor. (Humidity detecting means).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Ito 1-1 Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd. (72) Inventor Yuji Honda 1-1 Showa-cho, Kariya city, Aichi Nidec Co., Ltd. (72) Inventor, Katsuhiko Samukawa, 1-1, Showa-cho, Kariya city, Aichi prefecture, Nihon Denso Co., Ltd. (72) Inventor, Yoshio Shinoda, 1-1, Showa-cho, Kariya city, Aichi prefecture, Nihondenso Co., Ltd.

Claims (6)

[Claims] 1. A dehumidifying means for dehumidifying air blown into a room by cooling, a humidity detecting means for detecting humidity in the room, and a cooling temperature of the dehumidifying means based on the humidity detected by the humidity detecting means. Dehumidifying control means, a humidity estimating means for estimating the indoor humidity by a predetermined arithmetic expression when a predetermined condition is satisfied, and a difference between the humidity detected by the humidity detecting means and the estimated humidity by the humidity estimating means. And a correction unit that corrects the humidity detected by the humidity detection unit used by the dehumidification control unit. 2. The air conditioner according to claim 1, wherein the humidity estimating means estimates the indoor humidity when the air cooled by the dehumidifying means is saturated. 3. An outside air temperature detecting means for detecting an outdoor temperature is provided, and the humidity estimating means is provided when the temperature detected by the outside air temperature detecting means is a predetermined value or more and the dehumidifying means is cooled to a predetermined temperature. The air conditioner according to claim 2, wherein it is determined that the air cooled by the dehumidifying means is saturated. 4. The correcting means corrects the humidity detected by the humidity detecting means when the difference between the humidity detected by the humidity detecting means and the estimated humidity by the humidity estimating means becomes a predetermined value or more. The air conditioner according to any one of claims 1 to 3, wherein: 5. The dehumidification control means is switchable to an outside air mode for dehumidifying outdoor air by the dehumidifying means and blowing the air indoors or an inside air mode for dehumidifying indoor air by the dehumidifying means and blowing the air indoors. The air conditioner according to any one of claims 1 to 4, wherein the humidity estimating means selects an arithmetic expression for estimating humidity according to an outside air mode or an inside air mode. 6. The air conditioner according to any one of claims 1 to 5 is mounted on a vehicle, and the dehumidification control means is configured to dehumidify the vehicle interior such that the window glass of the vehicle is not fogged. An air conditioner for a vehicle, characterized in that the means is cooled to a predetermined temperature.