JP3721665B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a control method for an air conditioner for a vehicle, and particularly in the foot mode, when the amount of solar radiation incident on the passenger compartment increases, toward the occupant's upper body so as to cancel out the increase in heat load caused by the solar radiation. It relates to air blown air.
[0002]
[Prior art]
Conventionally, in the foot mode, when the amount of solar radiation incident on the passenger compartment increases, the conditioned air is blown out toward the occupant's upper body so as to cancel out the increased heat load caused by the solar radiation. There is what is described in.
And in this conventional apparatus, when the vehicle interior is heated in a foot mode in which air-conditioned air is blown from the foot air outlet to the feet of the occupant, if the amount of solar radiation entering the vehicle interior increases, the air outlet mode is changed from the face air outlet. The system is switched to the bi-level mode in which cool air is blown out to the upper body of the occupant and hot air is blown out from the foot outlet. At this time, the temperature of the conditioned air blown to the upper body of the occupant is controlled by opening the cold air bypass passage (passage for directly sending the cold air having passed through the evaporator to the face duct) at the cold air bypass door. In addition to canceling out the increase in heat load due to solar radiation, the temperature is controlled to match the sensation of the passenger.
[0003]
[Problems to be solved by the invention]
By the way, the present inventors have blown the conditioned air from the defroster outlet toward the inner surface of the vehicle window glass while blowing the conditioned air to the feet of the occupant as described above in the foot mode. The following was found.
That is, the foot mode is generally a blow-out mode for heating the passenger compartment and is used in winter when the outside air temperature is low. Therefore, since the windshield of the vehicle is in a state of being easily fogged, as described above, the conditioned air may be blown toward the occupant's feet, and the conditioned air may be blown from the defroster outlet toward the inner surface of the vehicle windshield. Many.
[0004]
Therefore, in such a foot mode, if the amount of solar radiation increases as described above and the blowing mode is switched to the bi-level mode, the conditioned air is not blown toward the windshield of the vehicle. There is a problem that the cloudiness deteriorates.
Therefore, in the foot mode in which the conditioned air is blown from both the foot outlet and the defroster outlet, the present invention cancels the increase in the heat load caused by the solar radiation and increases the vehicle's window glass. The purpose is to improve the antifogging property.
[0005]
[Means for Solving the Problems]
Then, this inventor thought that the said objective could be achieved by using the following vehicle air conditioners. Hereinafter, the vehicle air conditioner will be described.
That is, as a face air outlet for blowing air conditioned air toward the upper body of the occupant in the vehicle air conditioner, a center face air outlet provided at the vehicle width direction center of the vehicle instrument panel portion and an end in the vehicle width direction There is a side face outlet provided in the section.
[0006]
The side face outlet is always open when the air conditioner is in operation (the air conditioning fan is in operation) in any air outlet mode unless the air outlet grill in the passenger compartment is closed. That is, a center face switching door is provided at the center face outlet, and the blowing mode is switched by this door.
[0007]
Therefore, in the present invention, paying attention to the fact that the side face outlet is always open in this way, when the solar radiation increases in the foot mode described above, the cold air bypass passage is opened at the cold air bypass door, and this passage is opened. By blowing the flowing cold air to the side face air outlet, we can cancel out the increase in heat load due to solar radiation and leave the air blowing mode in the foot mode. It was.
[0008]
Therefore, claims 1 to 3 In the described invention, the upper air passage (7) is configured to always open, and the bypass control means (29, 100) includes the defroster air passage (5) and the lower air passage (9, 10). ) When the amount of solar radiation incident on the passenger compartment becomes larger than a predetermined value (A) in the blowout mode in which the conditioned air is blown from both sides, the bypass passage opening / closing means (22) Cold wind By opening the bypass passage (21), the temperature of the conditioned air blown from the upper air passage (7) is reduced.
[0009]
As a result, when the amount of solar radiation becomes larger than a predetermined value, the bypass passage is opened, and the cool air is blown into the upper air passage to lower the temperature of the conditioned air blown from the upper air passage. The increase can be canceled out and the occupant's feeling can be improved. At this time, since the conditioned air is blown out from the air passage for the defroster, the anti-fogging property of the window glass of the vehicle can be ensured.
[0010]
Also, Contract Claim 1 In the described invention, the other end side of the cold air bypass passage (21) is in communication with the defroster air passage (5), and a physical quantity corresponding to the temperature of the conditioned air blown into the defroster air passage (5) is detected. The bypass control means (29, 100) has a temperature of conditioned air blown from the defroster air passage (5) based on the physical quantity detected by the physical quantity detection means (40). Bypass so that is higher than the specified temperature aisle Opening and closing means (22) Control When the physical quantity detected by the physical quantity detection means (40) falls to a predetermined physical quantity corresponding to the predetermined temperature, the bypass passage opening / closing means (22) is controlled to close the cold air bypass passage (21). It is characterized by doing.
[0011]
As a result, when the cold air bypass passage is opened, the cold air from the cold air bypass passage flows into the defroster air passage, the temperature of the conditioned air blown from the defroster air passage is lowered, and the anti-fogging property is lowered. However, since the temperature of the conditioned air blown from the defroster air passage does not fall below a predetermined temperature, the antifogging property of the vehicle window glass can be improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram of a vehicle air conditioner according to the present embodiment. FIG. 2 shows a control device for a vehicle air conditioner according to this embodiment.
An air-conditioning case 1 that forms an air passage has an opening 2, and a blower unit (not shown) that houses a blower is provided on the front side of the paper in the opening 2, and when the blower is driven, An air flow is generated in the air conditioning case 1.
[0013]
In the air conditioning case 1, an evaporator 3 as a cooling heat exchanger and a heater core 4 as a heating heat exchanger are provided in order from the air upstream side. The evaporator 3 is a heat exchanger that constitutes a well-known refrigeration cycle together with a compressor, a condenser, and a decompression unit (not shown), and cools the air in the air conditioning case 1. The heater core 4 is a heat exchanger through which engine coolant flows, and heats the air in the air conditioning case 1.
[0014]
At the air downstream end of the air conditioning case 1, ducts 5 to 10 that are air passages for blowing out the conditioned air toward each place in the vehicle compartment are provided. Of these, the duct 5 constitutes a defroster air passage for blowing conditioned air toward the inner surface of a vehicle window glass (front glass) (not shown). The duct 6 is a center face air passage for blowing conditioned air toward a front seat occupant from a center-face air outlet (not shown) provided at the center in the vehicle width direction.
[0015]
Furthermore, the duct 7 is an air passage for a side face for blowing conditioned air from both ends in the vehicle width direction toward the upper body of the front seat occupant. The duct 8 is a rear face air passage (not shown) for blowing conditioned air toward the upper body of the rear seat occupant. The duct 9 is a front foot air passage for blowing air-conditioned air toward the feet of the front seat occupant. The duct 10 is formed with a rear foot outlet for blowing conditioned air to the feet of the rear seat occupant.
[0016]
In the air conditioning case 1, a first drive shaft 11 as a rotating shaft and a first driven shaft 12 as the rotating shaft are supported rotatably with respect to the air conditioning case 1. The first drive shaft 11 and the first driven shaft 12 are fixed and wound at both ends of an air mix door 13 made of a flexible film member.
[0017]
The air mix door 13 includes a hot air passage 14 through which the air passes through the heater core 4 and bypass passages 15 and 16 that bypass the heater core 4 by the first drive shaft 11, the heater core 4, and the first driven shaft 12. Each is stretched across.
The first drive shaft 11 is driven by its drive means (specifically, step motor 30), and the rotation of the first drive shaft 11 is rotated by means of rotation transmission means (specifically, wire) (not shown). Is transmitted to.
[0018]
The air mix door 13 has an opening (not shown) for allowing air to pass therethrough, and the step motor drives the first drive shaft 11 in both forward and reverse directions to stop the opening at an arbitrary position. As a result, the amount of air blown to each of the air passages 14 to 16 is adjusted. The stop position control method of the air mix door 13 is controlled by the number of drive signals output to the step motor from a control device (not shown).
[0019]
Further, in the air conditioning case 1, a second drive shaft 17 as a rotation shaft, a second driven shaft 18 as a rotation shaft, and an intermediate shaft 19 as a rotation shaft rotate with respect to the air conditioning case 1. Supported as possible. The second drive shaft 17 and the second driven shaft 18 are fixed and wound at both ends of a blowing mode switching door 20 made of a flexible film member. The blow mode switching door 20 is stretched by the second drive shaft 17, the intermediate shaft 19 and the second driven shaft 18 so as to face the opening on the air upstream side of the air passages 6 to 10. .
[0020]
The second drive shaft 17 is driven by its drive means (specifically, a step motor 31), and the rotation of the second drive shaft 17 is rotated by a second transmission shaft (not shown) by a rotation transmission means (specifically, a wire). 18 is transmitted.
The blow mode switching door 20 has an opening (not shown) for allowing air to pass therethrough, and the step motor 31 rotates the second drive shaft 17 in both forward and reverse directions to arbitrarily open the opening. By stopping at the position, five predetermined blowing modes are switched. The stop position control method of the blow mode switching door 20 is controlled by the number of drive signals output from the control device 100 to the step motor 31.
[0021]
Here, the five blowing modes in the present embodiment will be described. In the present embodiment, the air intake of the side face air passage 7 is always open in any blowing mode, and the conditioned air is blown.
▲ 1 ▼ Face mode
In the face mode, the blowout mode switching door 20 opens the center face air passage 6 and closes the other air passages 5 to 10. Accordingly, in the face mode, the conditioned air is blown to the center face air passage 6 and the side face air passage 7.
[0022]
▲ 2 ▼ Bileval mode
In the bi-level mode, the blowout mode switching door 20 opens the center face air passage 6, the rear face air passage 8, the front foot air passage 9, and the rear foot air passage 10, and the defroster air passage 5 is opened. close. Thus, in the face mode, the conditioned air is blown to the rear face air passage 8, the center face air passage 6, and the side face air passage 7.
[0023]
▲ 3 ▼ Foot mode
In the foot mode, the blowout mode switching door 20 opens the front foot air passage 9, the rear foot air passage 10, and the defroster air passage 5, and the center face air passage 6 and the rear face air passage 8 are opened. close. Thus, in the foot mode, the conditioned air is blown to the front foot air passage 9, the rear foot air passage 10, the defroster air passage 5, and the side face air passage 7.
[0024]
In this foot mode, the air volume ratio of the conditioned air blown from the front foot air passage 9 and the defroster air passage 5 is about 8 to 2.
▲ 4 ▼ Foot differential mode
In the foot differential mode, the front foot air passage 9, the rear foot air passage 10, and the defroster air passage 5 are opened by the blow mode switching door 20, and the center face air passage 6 and the rear face air passage 8 are provided. Close. Thus, in the foot mode, the conditioned air is blown to the front foot air passage 9, the rear foot air passage 10, the defroster air passage 5, and the side face air passage 7.
[0025]
In this foot differential mode, the air volume ratio of the conditioned air blown from the front foot air passage 9 and the defroster air passage 5 is about 5 to 5. In the air conditioning case 1, there is formed a cold air bypass passage 21 having one end opened to the air downstream side of the evaporator 3 and the air upstream side of the heater core 4 and the other end bypassed the heater core 4. And this cold air bypass passage 21 Is opened upstream of the air passages 6 to 10 as shown in the figure.
[0026]
And this cold air bypass passage 21 Is opened and closed by a cold air bypass door 22 which is an opening / closing means. The cold air bypass door 22 is driven by a servo motor 29 as drive means. The cold air bypass door 22 is configured to open the cold air bypass passage 21 at the time of max cool when the opening of the air mix door fully closes the hot air passage 14 and fully opens the bypass passages 15 and 16.
[0027]
Next, the control apparatus 100 of the vehicle air conditioner in this embodiment is demonstrated. The control device 100 has, as input terminals, an inside air temperature sensor 32 that detects the temperature inside the vehicle interior, an outside air temperature sensor 33 that detects the temperature outside the vehicle interior, a solar radiation sensor 34 that detects the amount of solar radiation irradiated into the vehicle interior, and the vehicle. A temperature setting device 35 is manually connected for the passenger to manually set the desired temperature in the room. The temperature setting device 35 is provided on an instrument panel (not shown) in the passenger compartment.
[0028]
And the control device 100 Includes a multiplexer, an A / D converter, a microcomputer, etc. (each not shown), and signals from the sensors are converted into digital signals by the A / D converter and then input to the microcomputer. The microcomputer also receives a signal from an auto switch (not shown) for setting the operating state of the air conditioner to an automatic control state.
[0029]
Microcomputers are known per se with a central processing unit (CPU), read only memory (ROM), random access memory (RAM), input / output port (I / O), etc. For example, the engine ignition switch is turned on. When the power is turned on, power is supplied from a battery (not shown) to enter an operating state.
And each calculation mentioned later is performed based on each said signal, and a control signal is each output to the said servomotor 29, step motor 30,31 grade | etc., Based on this calculation result.
[0030]
Next, the operation of the vehicle air conditioner in the present embodiment will be described based on the flowchart of FIG.
When the automatic air conditioner is selected, first, in step S100, various information is read, and the signals from the inside air temperature sensor 32, outside air temperature sensor 33, solar radiation sensor 34, post-evaporator sensor 36, and water temperature sensor 36 are converted into A / D converters. The A / D converted values (Tr, Tam, Ts, Te, Tw) are read and the signal Tset from the temperature setter 35 is read.
[0031]
Then, in step S200, based on various data stored in the RAM and the following formula 1 stored in the ROM, a target blowing temperature (hereinafter referred to as TAO) of the conditioned air blown into the passenger compartment is calculated.
[0032]
[Expression 1]
TAO = Kset × Tset−Kr × Tr−Kam × Tam + C
(Kset, Kr, Kam are each gain, C is a correction constant)
Next, in step S300, it is determined which of the five blowing modes described above is the actual blowing mode. Specifically, using the characteristics (not shown) stored in the TAO and ROM, the face mode, the bi-level mode, the foot mode, and the foot differential mode are switched in order as the TAO calculated in step S200 increases. The defroster mode is not switched unless a defroster switch on an air conditioner operation panel (not shown) is turned on.
[0033]
Next, in step S400, the blower level (air flow rate, applied voltage) of the blower is determined. Specifically, the blower level is determined from the TAO and the characteristics (not shown) stored in the ROM. The TAO is constant in the intermediate area, increases as the TAO becomes lower than the intermediate area, and increases as the TAO becomes higher than the intermediate area. To be decided.
[0034]
Next, in step S500, the target opening degree SW of the air mix door 13 is calculated based on the following mathematical formula 7 stored in the ROM.
[0035]
[Expression 2]
SW = {(TAO−Te) / (Tw−Te)} × 100 (%)
And in step S600, the opening degree control of the said cold wind bypass door 22 which is the principal part of this invention is performed. Hereinafter, the control content of the cold wind bypass door 22 in this embodiment is demonstrated based on the flowchart of FIG.
[0036]
First, in step S601, it is determined whether or not the blowing mode determined in step S300 is the foot mode. And if the determination result of this step S601 is YES and it determines with it being foot mode, it will progress to step S602. On the other hand, if the determination result of step S601 is NO, the process returns from this flowchart.
[0037]
In step S602, it is determined whether the solar radiation amount Ts detected by the solar radiation sensor 34 is greater than a predetermined value A. As shown in FIG. 4, the predetermined value A is determined from a characteristic diagram having hysteresis so that the cold air bypass door 21 does not cause control hunting. Specifically, the predetermined value A is a2 when the solar radiation amount Ts is increasing, and is a1 smaller than a2 when the solar radiation amount Ts is decreasing.
[0038]
In step S602, for example, as shown in FIG. 4, when the solar radiation amount Ts increases and becomes greater than the predetermined value a2, it is determined that the cold air bypass door 21 (cold air B / P) may be opened, and the process proceeds to step S603. move on.
In step S603, it is determined whether or not the difference between the set temperature Tset set by the temperature setter 35 and the internal temperature Tr detected by the internal temperature sensor 32 is smaller than a predetermined value B.
[0039]
Here, when the vehicle interior is heated, in the warm-up state in which the vehicle interior is rapidly heated, the difference between the set temperature Tset and the internal temperature Tr is large, and the vehicle interior is gradually warmed. In a stable steady state, the difference between the set temperature Tset and the internal temperature Tr becomes small. Therefore, in this step S603, it is determined whether the warm-up state or the steady state.
[0040]
If the determination result in step S603 is NO and it is determined that the vehicle interior is in a warm-up state, there is no need to open the cold air bypass passage 21 at the cold air bypass door 22; Is done.
On the other hand, if the determination result in step S603 is YES, it is determined that the vehicle interior is in a steady state, and if the solar radiation amount Ts is larger than the predetermined value A as described above, the passenger feels motivated by the solar radiation and the passenger is not satisfied. Gives pleasure.
[0041]
Therefore, in step S603, as shown in FIG. 5, when the difference between the set temperature Tset and the inside air temperature Tr is larger than the predetermined value b1 and the vehicle interior is warmed up, the cold air B / P door 22 is closed, Heat the passenger compartment rapidly. On the other hand, as shown in FIG. 5, when the difference between the set temperature Tset and the internal temperature Tr is smaller than the predetermined value b2 and is in a steady state, it is determined that the cold air bypass door 22 may be fully opened. Further, as shown in FIG. 5, when the difference between the set temperature Tset and the internal air temperature Tr increases from the predetermined value b1 to the predetermined value b2, the opening degree of the cold air bypass door 22 is determined so as to gradually decrease. In addition, between this predetermined value b1 and the predetermined value b2, when the amount of solar radiation Ts increases in the said bi-level mode, it is used in order to cancel the thermal load increase by this solar radiation and to achieve head cold foot heat.
[0042]
Thereby, in this embodiment, in the foot mode, when the amount of solar radiation Ts incident on the vehicle interior increases, the cold air bypass passage 21 is opened by the cold air bypass door 22, and the cold air flowing through the passage 21 is The air is sent to the side face air passage 7 provided in the vicinity of the air outlet 21.
As a result, the temperature of the conditioned air blown from the side face air passage 7 into the vehicle interior is reduced, so that the increase in the thermal load due to solar radiation can be canceled out and the occupant can be prevented from being forced by solar radiation.
[0043]
In the present embodiment, when the amount of solar radiation increases in the foot mode, the cool air bypass passage 22 is opened, but the blowing mode remains in the foot mode. That is, the foot mode is a blowing mode that generally heats the passenger compartment, and the temperature outside the passenger compartment is low. Therefore, in the foot mode, the vehicle windshield is likely to be fogged. Therefore, in this embodiment, even if the amount of solar radiation increases in the foot mode, it remains in the foot mode, so the conditioned air is blown from the defroster air passage 5 to the windshield. Haze can be secured.
[0044]
By the way, in this embodiment, as shown in FIG. 1, the other end side (air outlet portion) of the cold air bypass passage 21 is disposed in the vicinity of the downstream side of the defroster air passage 5 and the side face air passage 7. As a result, the following problems may occur.
That is, when the cold air bypass passage 21 is opened by the cold air bypass door 22 in the foot mode as described above, the cold air from the cold air bypass passage 22 is blown into the defroster air passage 5. As a result, there is a problem that the temperature of the conditioned air blown to the defroster air passage 5 is lowered and the anti-fogging property is lowered.
[0045]
Therefore, in this embodiment, this problem is solved as follows.
That is, in the present embodiment, as described above, the conditioned air temperature sensor 40 is disposed in the side face air passage 7. In the present embodiment, the air-conditioning air temperature sensor 40 detects the temperature of the air-conditioning air that is blown to the side face air passage 7 in order to achieve the cold head heat according to the sensation of the passenger in the bi-level mode described above. Is for feedback control. Since this content is the same as that described in Japanese Patent Laid-Open No. 6-262927, description thereof is omitted here.
[0046]
In the present embodiment, the air-conditioning air temperature sensor 40 is used to limit the temperature of the air-conditioning air blown into the defroster air passage 5 so as not to be lower than a predetermined value C.
In the present embodiment, the above-described air-conditioning air temperature sensor 40 is used to provide a lower limit value for the temperature of the air-conditioning air blown to the defroster air passage 5. Here, in FIG. 6, the inventors show the correlation between the temperature of the conditioned air blown to the side face air passage 7 and the defroster air passage 5 at the operating position (opening degree) of the cold air bypass door 21. Experimental data is shown. As an experimental condition, an operating position (opening) at which the air mix door 12 flows about 80% in the hot air passage 14 and about 20% in the other cool air passages out of the air passing through the evaporator 3. Furthermore, the vehicle interior is in the above-described steady state at 25 ° C. and the blower level is Low.
[0047]
As can be seen from FIG. 6, the temperature of the conditioned air blown to the defroster air passage 5 and the side face air passage 7 has a correlation. And when the opening degree of the cold wind bypass door 22 is fully closed, there is almost no difference in the temperature of the conditioned air sent to both the passages 5 and 7.
Then, as the opening degree of the cold air bypass door 22 approaches full open, the temperature of the conditioned air in both the passages 5 and 7 decreases, and the temperature of the conditioned air blown into the defroster air passage 5 is more for the side face. It becomes lower than that of the air passage 7.
[0048]
The reason for this is that the shape characteristics of the air conditioning case 1 and the side face air passage 7 (duct 7) in the present embodiment are configured to extend in the vehicle width direction. Resistance is great. Thus, as the cold air bypass door 22 approaches full opening, the temperature of the conditioned air blown to the defroster air passage 5 becomes lower than that of the side face air passage 7.
[0049]
Therefore, as described above, when the solar radiation amount Ts becomes larger than the predetermined value A in the foot mode, if the cold air bypass door 22 is simply fully opened, the temperature of the conditioned air blown to the defroster air passage 5 is too low, The antifogging property is lowered. Therefore, in the present embodiment, the temperature of the conditioned air blown into the defroster air passage 5 is higher than the predetermined temperature (35 degrees in the present embodiment), which is the lowest temperature that can ensure the antifogging property of the vehicle windshield. Set as follows. In order to do this, if the temperature of the conditioned air blown to the side face air passage 7 from the correlation diagram shown in FIG. 6 is a predetermined temperature C (44 degrees), the cold air bypass passage 21 is opened. Thus, the temperature of the air-conditioning air blown to the side face air passage 7 is lowered to cancel the increase in the heat load due to solar radiation, and the anti-fogging property is improved by the air-conditioning air sent to the defroster air passage 5 Can do.
[0050]
Therefore, in the present embodiment, first, in step S604, based on the solar radiation amount Ts, a reduction width (decrease temperature) T of the conditioned air blown to the side face air passage 7 that only cancels the solar radiation amount Ts is calculated. To do. Specifically, the decrease width T is calculated to be larger as the solar radiation amount Ts increases.
Next, in step S605, the cold air bypass door 22 is gradually operated so that the temperature of the conditioned air blown to the side face air passage 7 is lowered by the decrease width T calculated in step S604.
[0051]
In step S606, it is determined whether or not the actual blowout temperature D detected by the air-conditioning air temperature sensor 40 has reached the predetermined value C. If the determination result in step S606 is YES, the process exits this flowchart. On the other hand, the determination result in step S606 is NO In this case, the process returns to step S602 to perform feedback control.
[0052]
Specifically, the operation of steps S605 and 606 will be described with reference to FIG. When the cold air bypass door 21 is actuated in step S605, the temperature of the conditioned air blown into the side face air passage 7 and the defroster air passage 5 gradually decreases as shown in FIG.
In step S605, feedback control is performed until the blowout temperature D of the conditioned air actually blown into the side face air passage 7 in step S606 reaches a predetermined temperature C that can ensure the anti-fogging property of the windshield. . Then, when the blowout temperature D finally reaches the predetermined temperature C (when the temperature of the conditioned air blown to the defroster air passage 5 is lowered to 35 degrees), the operation of the cold air bypass door 22 is stopped, and this flowchart Exit.
[0053]
As a result, the increase in the heat load due to solar radiation can be canceled according to the occupant's feeling, and the temperature of the conditioned air blown into the defroster air passage 5 does not drop below 35 degrees. The haze can be improved.
(Other embodiments)
In the above embodiment, the foot mode is described. However, in the foot differential mode, the cold air bypass passage 21 may be opened according to the solar radiation amount Ts.
[0054]
In the above embodiment, the conditioned air temperature sensor 30 is provided in the side face air passage 7, but it may be provided in the defroster air passage 5.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration diagram of a vehicle air conditioner according to an embodiment of the present invention.
FIG. 2 is a flowchart showing the operation of the vehicle air conditioner in the embodiment.
FIG. 3 is a flowchart showing the operation of the vehicle air conditioner in the embodiment.
4 is a diagram illustrating a relationship between an amount of solar radiation Ts and opening / closing of the cold air bypass door 22 in the embodiment. FIG.
FIG. 5 is a diagram showing the relationship between the difference between the set temperature Tset and the internal air temperature TR and the opening and closing of the cold air bypass door 22 in the embodiment.
FIG. 6 is a diagram showing the relationship between the open / closed state of the cold air bypass door 22 and the temperature of the conditioned air blown out from each of the side face air passage and the defroster air passage in the embodiment.
[Explanation of symbols]
1 ... Air conditioning case, 3 ... Evaporator, 4 ... Heater core
5 ... Air passage for defroster, 7 ... Air passage for side face
9 ... Air passage for front foot, 10 ... Air passage for rear foot
21 ... Cold air bypass passage, 22 ... Cold air bypass door, 29 ... Servo motor
100 ... Control device

Claims (3)

The cooling heat exchanger (3) is arranged in the air conditioning case (1) forming the air passage, and the heating heat exchanger (4) is arranged downstream of the cooling heat exchanger (3). And
An upper air passage (7) that opens to the downstream side of the heating heat exchanger (4) and blows conditioned air from the end in the vehicle width direction toward the upper body of the passenger, and the inner surface of the vehicle window glass A defroster air passage (5) for blowing conditioned air toward the lower air passage (9, downstream) of the cooling heat exchanger (3) and a lower air passage (9, 10 ) and one end side is the downstream side of the cooling heat exchanger (3) and the upstream side of the heating heat exchanger (4), and the other end side is the heating heat exchanger (4). A cold air bypass passage (21) bypassed and communicated with the upper air passage (7), a bypass passage opening / closing means (22) for opening and closing the cold air bypass passage (21), and the bypass passage opening / closing means (22) Bypass control means (29, 100) to control A vehicle air conditioner comprising:
The upper air passage (7) is configured to always open,
The other end side of the cold air bypass passage (21) communicates with the defroster air passage (5),
Physical quantity detection means (40) for detecting a physical quantity corresponding to the temperature of the conditioned air blown into the defroster air passage (5);
The bypass control means (29, 100) is configured to reduce the amount of solar radiation that enters the vehicle interior in a blowing mode in which conditioned air is blown from both the defroster air passage (5) and the lower air passage (9, 10 ). When larger than a predetermined value (A), the temperature of the conditioned air blown from the upper air passage (7) is lowered by opening the cold air bypass passage (21) by the bypass passage opening / closing means (22). Based on the physical quantity detected by the physical quantity detection means (40), the bypass passage opening / closing means (so that the temperature of the conditioned air blown from the defroster air passage (5) becomes higher than a predetermined temperature. 22), when the physical quantity detected by the physical quantity detection means (40) falls to a predetermined physical quantity corresponding to the predetermined temperature, the bypass passage opening / closing means ( The vehicle air conditioner is controlled to close the cold air bypass passage (21) at 22) . Upper opening and closing means (20) for opening and closing the upper air passage (7);
Defroster opening and closing means (20) for opening and closing the defroster air passage (5);
A center face air passage (6) that is provided at the center in the vehicle width direction and blows conditioned air toward the upper body of the occupant;
Center face opening and closing means (20) for opening and closing the center face air passage;
The open / close control means (31, 100) for controlling the upper opening / closing means (20), the defroster opening / closing means (20), and the center face opening / closing means (20). Vehicle air conditioner. When the difference between the set temperature (Tset) in the passenger compartment and the temperature (Tr) in the passenger compartment is smaller than a predetermined value (B), the bypass control means (29, 100) The air conditioning apparatus for vehicles according to claim 1 or 2, wherein the cold air bypass passage (21) is opened.

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