JP3119035B2 - Vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to
The present invention relates to a vehicle air conditioner capable of bi-level mode operation in which air at different temperatures is blown out to perform air conditioning in a vehicle compartment.

[0002]

2. Description of the Related Art As an example of a bi-level mode operation, a bi-level mode operation in which cool air is blown out from a face air outlet that blows air to the upper body of an occupant and warm air is blown out from a foot air outlet that blows air to the occupant's feet. is there.

FIG. 14 shows an outline of an example of a vehicle air conditioner that performs the bilevel mode operation. The duct 100 provided with a blower for sending air into the vehicle compartment includes a face outlet 101 and a foot outlet 102. Duct 10
Cooling means (for example, an evaporator) 103 for cooling the air is provided upstream of 0, and a heating means (for example, a heater core) 104 for heating the air and a bypass passage 105 for bypassing the heating means 104 are provided downstream thereof. . The amount of air passing through the heating means 104 and the bypass passage 1
The amount of air passing through 05 is adjusted by an air mix damper 106 which is a temperature adjusting means. Then, when the bi-level mode operation is selected, the air (the cool air cooled by the cooling means 103) passing through the bypass passage 105 is mainly blown out from the face outlet 101, and the air heated by the heating means 104 (temperature). The wind is mainly blown out from the foot outlet 102.

[0004]

However, in the prior art, for example, economy operation is performed to reduce the cooling load of the cooling means 103, and when the degree of cooling of the air by the cooling means 103 becomes small, the air blows out from the face outlet 101. The temperature of the air being heated rises, causing occupants to feel uncomfortable. Further, for example, in a vehicle air conditioner having an auto air conditioner function for keeping the temperature in the vehicle cabin at a target temperature, when the degree of cooling of the air by the cooling means 103 becomes small, such as in an economy operation, in order to keep the blowing temperature constant. , The air mix damper 106 operates to reduce the amount of air passing through the heating means 104. As a result, the outlet temperature of the foot outlet 102 decreases and the face outlet 101
Temperature rises, and the temperature difference between the two outlets becomes smaller. As described above, in the related art, when the degree of cooling of the air by the cooling unit 103 is reduced, the temperature difference between the two outlets is reduced, so that the head cold foot heat is not achieved and the occupant is uncomfortable.

[0005] The occurrence of a problem due to the provision of the auto air conditioner function will be specifically described with reference to FIG.
The cooling means 103 is normally provided so that frost does not occur.
The temperature of the air passing through the cooling means 103 (so-called post-evaporation temperature) is controlled so as to be 3 to 4 ° C. The face outlet 101 and the foot outlet 10 during the bilevel mode operation when the cooling means 103 is normally operated.
As shown by the solid lines A1 and A2 in FIG. 13, the outlet temperature of the air conditioner 2 changes even if the target outlet temperature TAO of the air conditioner changes.
The temperature difference between the two outlets ensures a sufficient temperature difference (15 to 20 ° C.) to achieve head and foot fever. On the other hand, when the degree of cooling of the air by the cooling unit 103 is reduced by the economy operation, the cooling unit 103 is set so that the temperature of the air passing through the cooling unit 103 becomes, for example, 15 ° C. higher than the normal 3 to 4 ° C. Controlled. When the cooling means 103 is operated in the economy mode when the cooling means 103 is operated in the bi-level mode, the temperature difference between the face air outlet 101 and the foot air outlet 102 is, as shown by broken lines C1 and C2 in FIG. It becomes so small that it cannot achieve head and foot fever, which causes discomfort to the occupants. The reason for this is that the temperature of the air passing through the cooling means 103 rises to 15 ° C., so that the temperature of the air blown out of the face air outlet 101 rises and the air mix damper 106 is heated by the heating means 104 so as to prevent the room temperature from rising. To close, and the temperature of the outlet of the foot outlet 102 decreases. If the temperature of the air that has passed through the cooling means 103 is 15 ° C., air at 15 ° C. cannot be obtained from the face outlet 101 (see point a in FIG. 13). Since the air passing through the means 104 and the air passing through the bypass passage 105 are partially mixed, the temperature of the air actually blown out from the face outlet 101 is higher than 15 ° C. (point b in FIG. 13). See). As described above, in the vehicle air conditioner having the auto air conditioner function, the face outlet 101 and the foot outlet 1
02 becomes small, and the occupant feels uncomfortable.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air conditioner for a vehicle which can increase a temperature difference between a first outlet and a second outlet even if the cooling degree of the cooling means is reduced.

[0007]

The vehicle air conditioner of the present invention employs the following technical means. An air conditioner for a vehicle includes a duct having a first outlet and a second outlet for blowing air toward a vehicle interior, a blower for generating an airflow toward the vehicle interior in the duct, and a blower in the duct. Cooling means for cooling air, heating means provided in the duct downstream of the cooling means for heating the air, and air heated by the heating means downstream of the cooling means in the duct Temperature control means for adjusting an amount and a bypass amount bypassing the heating means, and the air bypassing the heating means is mainly used as the first air.
A bi-level mode operation in which the air heated by the heating means is mainly blown out from the second air outlet while being blown out from the air outlet is possible. The air conditioner for a vehicle includes a cooling level detecting unit that detects a degree of cooling of air by the cooling unit, a bilevel mode detecting unit that detects whether the bilevel mode operation is being performed, and the duct. The air branched off and cooled by the cooling means is bypassed to the first
A cool air bypass passage directly leading to the outlet, a cool air bypass amount adjusting means for adjusting an amount of air passing through the cool air bypass passage, the cooling degree detecting means and the bi-level mode detecting means, connected to the cooling air bypass passage, As a result of detection by the means, when the degree of cooling of the air by the cooling means is small and the bilevel mode operation is being performed,
And a cool air bypass control means for controlling the cool air bypass amount adjusting means so as to increase the amount of air passing through the cool air bypass passage.

The air conditioner for a vehicle is connected to the cooling degree detecting means and the bi-level mode detecting means, and as a result of detection by these detecting means,
A temperature adjustment control unit that controls the temperature adjustment unit so that the degree of cooling of the air by the cooling unit is small and the amount of air heated by the heating unit is increased when the bilevel mode operation is being performed. May be provided.

[0009]

In the bi-level mode operation, when the degree of cooling of the air by the cooling means is large, the cool air bypassing the heating means is mainly blown out from the first outlet, and the warm air heated by the heating means is discharged. It is mainly blown out from the second outlet.
In the bi-level mode operation, when the degree of cooling of the air by the cooling means is small, the amount of air passing through the cool air bypass passage is increased by the cool air bypass control means. Thus, the cool air that has passed through the cooling means is directly guided to the first outlet, and a rise in the temperature of the air blown out from the first outlet is suppressed. The warm air heated by the heating means is blown out from the second outlet.

[0010]

According to the air conditioner of the present invention, as described above, the air blown out from the first blow-out port even in the bi-level mode operation even when the degree of cooling of the air by the cooling means is small. As a result, the temperature difference between the upper and lower sides can be secured, and the occupant can be comfortable.

According to the present invention, even when the degree of cooling of the air by the cooling means is small, the rise in the temperature of the air blown out from the first outlet can be suppressed to a small level. When the degree of cooling of the air by the cooling means is small, the temperature control means is controlled by the cool air bypass control means to increase the amount of air heating by the heating means.
The temperature of the air blown out from the outlet increases, and as a result, the lower temperature air blown out from the first outlet can prevent the temperature in the vehicle compartment from lowering. Further, a large difference between the upper and lower temperatures can be taken, and the occupant can be made more comfortable.

[0012]

Next, an air conditioner for a vehicle according to the present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 to FIG. 13 show an embodiment of the present invention. FIG. 1 is a schematic structural view of an air conditioner for an automobile. The air conditioner for a vehicle according to the present embodiment is equipped with an auto air conditioner function for automatically maintaining the temperature in a vehicle cabin at a set temperature. The air conditioner for a vehicle is roughly divided into an air conditioning unit 1 and this air conditioning unit. And a control device 2 for controlling each functional component.

(Description of Air Conditioning Unit 1) Air Conditioning Unit 1
Is an inside / outside air switching means 3 for switching between inside air (inside air) and outside air (outside air) and sending the air to the inside of the vehicle, and a blower for sending the air selected by the inside / outside air switching means 3 to the inside of the vehicle. 4. A duct 5 for guiding the air flow generated by the blower 4 into the vehicle interior, an evaporator 6 serving as a cooling means for cooling the air flowing through the duct 5, and an air mixing system for adjusting the temperature of the air blown out from the duct 5. A temperature control device 7 is provided.

The inside / outside air switching means 3 is provided at an air inlet of the blower 4 and switches the air sucked into the blower 4 between inside air and outside air. The inside air introduction port 10 communicates with the inside of the vehicle and introduces inside air. An outside air inlet 11 is provided to communicate outside the vehicle compartment to introduce outside air. Also, the inside / outside air switching means 3
Is provided with an inside / outside air switching damper 12 capable of closing the inside air inlet 10 or the outside air inlet 11. The inside / outside air switching damper 12 is driven by a servo motor 13 and switches between an inside air circulation mode in which inside air is introduced through the inside air inlet 10 and an outside air introduction mode in which outside air is introduced through the outside air inlet 11.

The blower 4 is connected to the upstream end of the duct 5 and generates an airflow in the duct 5 toward the passenger compartment. The blower 4 includes a fan case 15, a fan 16, and a fan motor 17. The fan motor 17 rotationally drives the fan 16 in accordance with a voltage applied from a blower drive circuit 18, and passes inside air or outside air through the duct 5. Send to the cabin.

The duct 5 is disposed on the front side in the vehicle interior. On the outlet side of the duct 5, there are provided a plurality of outlets for blowing out the air passing through the duct 5 toward each part in the vehicle compartment. The air outlet is a face air outlet 20 (first air outlet of the present invention) that mainly blows cold air toward the upper body of the occupant, and a foot air outlet 21 (the air outlet of the present invention) that mainly blows warm air toward the foot of the occupant. A second blowout port) and a defroster blowout port 23 that mainly blows warm air toward the window glass 22. In the duct 5, a face damper 24, a foot damper 25, and a defroster damper 26 for adjusting an air flow rate to each air outlet are provided in an air passage communicating with each air outlet. Then, the face damper 24, the foot damper 25, and the defroster damper 2
6 are driven by servomotors 27 to 29, respectively.

Further, the duct 5 is provided with a cool air bypass passage 31 which branches off downstream of the evaporator 6 and directs the cool air passing through the evaporator 6 to the face outlet 20 by bypassing the temperature control device 7. On the upstream side of the cool air bypass passage 31, the cold air bypass passage 31 is opened and closed, and the opening is adjusted.
And a cool air adjusting damper 32 (a cool air bypass amount adjusting means of the present invention) for adjusting the amount of air passing through the cooling air. The cool air adjusting damper 32 is driven by a servo motor 33, and the amount of air passing through the cool air bypass passage 31 is adjusted according to the opening degree.

The evaporator 6 is a component of the refrigeration cycle 35 that cools the air passing through the duct 5. The evaporator 6 is disposed on the entire upstream surface of the duct 5 and cools all the air passing through the duct 5. Refrigeration cycle 35 shown in this embodiment
From the evaporator 6 to the compressor 36, the condenser 37, the receiver 38, and the expansion valve 3
This is a well-known configuration in which a refrigerant circulates through the evaporator 6 through the evaporator 9. The compressor 36 is further driven to rotate by transmitting the rotational power of an engine (not shown) via an electromagnetic clutch (not shown), and operates the refrigeration cycle 35. The electromagnetic clutch transmits the rotation of the engine to the compressor 36 when a voltage is supplied from the compressor drive circuit 40 to obtain the cooling capacity of the air by the evaporator 6, and conversely, the compressor drive circuit 4
When the supply of the voltage from 0 is stopped, the electromagnetic clutch does not transmit the rotation of the engine to the compressor 36, and the cooling of the air by the evaporator 6 is stopped.

In the present embodiment, the temperature control device 7 includes the heater core 4.
1 and an air mix damper 42 and the like. The heater core 41 is a heating means of the present invention for heating the air passing through the duct 5 downstream of the evaporator 6, and uses the cooling water (warm water) of the engine to heat the cold air passing through the evaporator 6. . The air mix damper 42 is a temperature adjusting means of the present invention, and is provided on the upstream side of the heater core 41, and the amount of air that passes through the heater core 41 and is heated by the heater core 41 according to the opening degree set by the servo motor 43. And the heater core 4
1 and the amount of air passing through the bypass passage 44 bypassing the bypass passage 1.

(Explanation of the control device 2) The control device 2 controls each electric functional component of the air conditioning unit 1 described above.
A CPU 50, a ROM 51, a RAM 52, and the like are mounted. A program for air-conditioning control is stored in the ROM 51, and various calculations and processes are performed by the CPU 50 based on the air-conditioning information temporarily stored in the RAM 52.

Output terminals A to F of the control device 2 are connected to servo motors 13, 27, 28, 29, 33, and 43, respectively, and drive and control each damper via each servo motor. The output terminal G of the control device 2 is connected to the blower drive circuit 18 and controls the amount of air generated by the blower 4 via the blower drive circuit 18. The servo motor 43 that drives the air mix damper 42 is provided with an air mix damper opening sensor 53 that detects the opening θ of the air mix damper 42, and is connected to the input terminal H of the control device 2.

The output terminal I of the control device 2 is connected to a compressor drive circuit 40, controls the electromagnetic clutch via the compressor drive circuit 40, and
, That is, the operation of the evaporator 6 as the cooling means. The compressor drive circuit 40 is provided with a clutch operation detection sensor for detecting the energized state of the electromagnetic clutch, and is connected to the input terminal J of the control device 2.

Further, the input terminals K to M of the control device 2
The switch is connected to an inside / outside air changeover switch 55, a temperature setting device 56, and a blowing mode setting switch 57 provided on an operation panel operated by a vehicle occupant. The input terminals N to R of the control device 2 include an inside air sensor 60 that detects the temperature of the air inside the vehicle compartment, an outside air sensor 61 that detects the temperature of the air outside the vehicle compartment, and solar radiation that detects the amount of sunlight entering the vehicle compartment. The temperature of the air passing through the sensor 62 and the evaporator 6 (hereinafter, referred to as the temperature
A post-evaporation sensor 63 for detecting the post-evaporation temperature) and a water temperature sensor 64 for detecting the cooling water temperature of the heater core 41 are connected. The post-evaporation sensor 63 functions as a cooling degree detecting unit that detects the degree of cooling of the air by the evaporator 6.

When the user selects the automatic air conditioner, the control device 2 automatically adjusts the outlet temperature, the air volume, and the outlet so that the temperature in the passenger compartment is maintained at the temperature set by the temperature setting device 56. Control. The CPU 50 of the control device 2
In order to perform an automatic air conditioner, a target outlet temperature TAO is calculated by the following equation 1 based on an input sensor signal.

[Equation 1] TAO = Kset · Tset−Kr · Tr−Kam ·
Tam−Ks · Ts + C Note that Kset, Kr, Kam, Ks, and C are correction constants. Tset is a set temperature signal detected by the temperature setting device 56; Tr is an inside air temperature signal detected by the inside air sensor 60; Tam is an outside air temperature signal detected by the outside air sensor 61;
s is a solar radiation signal detected by the solar radiation sensor 62.

Next, the controller 2 calculates the target opening θ0 of the air mix damper 42 by the following equation (2).

Equation 2 θ0 = {(TAO-TE) / (TW-TE)}
× 100 (%) where TE is the post-evaporation temperature signal of the post-evaporation sensor 63 and TW
Is a water temperature signal of the water temperature sensor 64. Then, the control device 2 outputs a signal corresponding to the target opening degree θ0 of the air mix damper 42 to the servo motor 43.

The control device 2 controls the compressor 36 so as not to generate frost in the evaporator 6 (frost prevention control), and reduces the air cooling load in an environment where dehumidification and cooling are not required much. The compressor 36 is controlled (economy control). Specifically, as shown in FIG.
In accordance with the outside air temperature detected by 1, the post-evaporation temperature at which the compressor 36 is operated (dashed line TON in the figure) and the post-evaporation temperature at which the operation of the compressor 36 is stopped (solid line TOFF in the figure) are set. And the compressor 36 by the control device 2
The actual control of the post-evaporation sensor 63 as shown in FIG.
Is the TON set at the outside air temperature
Is reached, the control device 2 turns on the electromagnetic clutch via the compressor drive circuit 40 to operate the compressor 36, and the post-evaporation temperature detected by the post-evaporation sensor 63 decreases to TOFF set by the outside air temperature signal Tam. Then, the control device 2 activates the electromagnetic clutch via the compressor drive circuit 40.
Turn OFF to stop the operation of the compressor 36.

The control device 2 is provided so that when the automatic air conditioner is selected, the inside / outside air mode, the air volume of the blower 4 and the blowing mode are automatically selected from the target blowing temperature TAO. As shown in FIG. 4, the switching control of the inside / outside air mode is automatically set to inside air or outside air in accordance with the target outlet temperature TAO. In the air volume control of the blower 4, as shown in FIG. 5, the applied voltage of the blower motor is automatically set in accordance with the target blowing temperature TAO. As shown in FIG. 6, the automatic switching control of the blowing mode includes a face mode in which the cool air is blown out only from the face outlet 20 in accordance with the target blowing temperature TAO. Is automatically set to a bi-level mode in which warm air is blown out from the camera, and a foot mode in which warm air is blown out from the foot outlet 21. The blowing mode automatically set by the control device 2 is detected by the control device 2 itself. That is, the control device 2 sets the bi-level mode, thereby detecting that the control device 2 selects the bi-level mode (function of the bi-level detection means of the present invention).

The control device 2 selects a bi-level mode (a mode in which cool air is blown out from the face air outlet 20 and a hot air is blown out from the foot air outlet 21) as the blowing mode, and the temperature after evaporation is controlled by the above-described economy control. When the temperature rises (when the degree of cooling of the air by the cooling means of the present invention is small), the function of the cool air bypass control means for controlling the opening of the cool air adjusting damper 32 to increase the amount of air passing through the cool air bypass passage 31 is provided. Is provided. As shown in FIG. 7, a specific function of the cool air bypass control means is that the post-evaporation temperature detected by the post-evaporation sensor 63 is, for example, 5 ° C. to 15 ° C.
As the temperature rises, the opening degree θb of the cool air adjusting damper 32 is gradually opened from 0 to 100%. When the temperature after the evaporation increases to 15 ° C. or more, the opening degree θb of the cool air adjusting damper 32 is set to 100%.

FIG. 7 shows an example in which the opening degree θb of the cool air adjusting damper 32 is gradually opened as the post-evaporation temperature rises. As shown in FIG.
When the post-evaporation temperature detected by the air conditioner rises to, for example, 15 ° C. or more, the opening θb of the cool air control damper 32 is opened by 100%, and when the air temperature is lowered to 10 ° C. or less, the opening θb of the cool air control damper 32 is closed to 0%. May be set as follows.

The control device 2 includes a cool air adjusting damper 3.
2 is opened (when the degree of air cooling of the cooling means is small and in the bi-level mode), the opening degree .theta.0 of the air mix damper 42 as the temperature adjusting means is corrected and operated by the heater core 41 as the heating means. A function of temperature control means for increasing the amount of air to be heated is provided. The temperature adjustment control means increases the temperature after the evaporating and increases the temperature of the face air outlet 20 through the cool air bypass passage 31.
When cooler air is blown out, the amount of air heated by the heater core 41 by the air mix damper 42 is increased (in other words, a decrease in the amount of air heated by the heater core 41 is prevented), and the actual blowing temperature relative to the target blowing temperature TAO is reduced. It is to prevent change. In particular,
As shown in FIG. 9, the post-evaporation temperature detected by the post-evaporation sensor 63 is set to, for example, 5 ° C. so that the correction opening degree Δθ of the air mix damper 42 is set according to the opening degree θb of the cool air adjustment damper 32. As the temperature rises to 15 ° C., the correction opening Δ
θ is increased to 0 to 8%, and when the temperature after evaporation rises to 15 ° C. or more, the correction opening Δθ is always set to 8%. It should be noted that the corrected opening degree Δθ is equal to the target opening degree θ0 as shown in the following Expression 3.
Is added to

## EQU3 ## θ0 = θ0 + Δθ

Further, the opening θb of the cold air adjusting damper 32 is
When the control is performed as shown in FIG. 8 described above, as shown in FIG. 10, when the post-evaporation temperature detected by the post-evaporation sensor 63 rises to 15 ° C. or more, the correction opening Δθ is set to 8%.
When the post-evaporation temperature drops below 10 ° C, the correction opening Δθ is set to 0.
Set to%. Further, the correction opening Δθ of the air mix damper 42 is represented by the following equation so that the correction opening Δθ of the air mix damper 42 is set according to the opening θb of the cool air adjustment damper 32. As described above, the function may be a function of the opening degree θb of the cool air adjusting damper 32.

## EQU4 ## where α is a constant.

(Explanation of the operation of the control device 2) Next, an example of the automatic air conditioner control by the control device 2 will be described with reference to the flowchart of FIG. First, when the automatic air conditioner is selected (start), first, data, a timer, a flag, and the like are initialized (step S1). Next, the set temperature signal Tset is read from the temperature setter 56,
2 (step S2). Subsequently, input signals are read from various sensors that detect a vehicle environment state that affects the air conditioning state in the vehicle cabin. That is, the inside air temperature signal Tr from the inside air sensor 60, the outside air temperature signal Tam from the outside air sensor 61, the insolation signal Ts from the insolation sensor 62, the after temperature signal TE from the after evaporation sensor 63, and the water temperature signal TW from the water temperature sensor 64 are read. (Step S3
).

Next, the various input data stored in the RAM 52 and the above-mentioned equation (1) stored in the ROM 51 in advance.
Based on the target air temperature TA
O is calculated (step S4). Subsequently, the target opening degree θ0 of the air mix damper 42 is calculated based on the various input data stored in the RAM 52 and the above-described formula 2 previously stored in the ROM 51 (step S5).

Next, the switching mode between the inside and outside air is set in step S
It is determined from the relationship between the target outlet temperature TAO calculated in step 4 and FIG. 4 (step S6). The applied voltage of the blower 4 is determined from the relationship between the target blowing temperature TAO calculated in step S4 and the applied voltage in FIG. 5 (step S7). The blowing mode is determined by comparing the target blowing temperature TAO calculated in step S4 with that of FIG.
(Step S8). Compressor 3
The operation of the evaporator 6, that is, the operation of the evaporator 6, which is a cooling means, is determined from the relationship between the post-evaporation temperature and FIGS. 2 and 3 (step S9).

Next, the opening degree of the cold air adjusting damper 32 is determined,
Then, an opening correction of the target opening θ0 of the air mix damper 42 is performed (step S10). The operation of step S10 will be described with reference to the subroutine of FIG. First, it is determined whether or not the blowing mode is the bi-level mode (step S11). If this determination is NO, the cool air adjustment damper 32 is closed (step S12), and the routine returns to this routine.
If the determination in step S11 is YES, the post-evaporation temperature and FIG.
Is determined from the relationship (step S13). Next, the correction opening degree Δθ of the air mix damper 42 is calculated from the relationship between the post-evaporation temperature and FIG. 9 (step S14). Subsequently, the corrected opening degree Δθ calculated in step S14 is added to the target opening degree θ0 set in step S5.
Is added to newly set the target opening degree θ0 (Step S
15) Then, return to this routine.

After the processing in step S10, the control signal determined by the above-described processing is transmitted to the blower driving circuit 18, the servo motor 13 for switching between inside and outside air, the servo motors 27 to 29 for switching the blowing mode, the compressor driving circuit 40, the air mix damper. The operation is output to the servo motor 43 for driving the cooling air conditioning damper 32 and the servo motor 33 for driving the cold air adjusting damper 32 (step S16), and the operation of each air conditioner is controlled. After that, the control cycle time τ
Is determined (step S17), and if the determination is NO, the control waits for the control cycle time τ to elapse.
Then, if the decision result in the step S17 is YES, the process returns to the step S2, and the above calculation and processing are repeated.

Next, the operation of the air conditioner in the bi-level mode will be described. (When the degree of cooling of the air by the evaporator 6 is large) When the outside air temperature is lower than 5 ° C or higher than 25 ° C,
The degree of cooling of the evaporator 6 is controlled so that the temperature after evaporation is between 3 and 4 ° C. As described above, when the temperature after evaporation is low, the cooling adjustment damper is closed, and the opening of the air mix damper 42 operates without correction. That is, the cool air that has passed through the bypass passage 44 is mainly blown out from the face outlet 20, and the warm air heated by the heater core 41 is mainly blown out from the foot outlet 21, thereby providing the occupant with head and foot heat. The air mix damper 4
2, the opening degree is adjusted in order to obtain the target outlet temperature TAO. Therefore, as shown by the solid lines A1 and A2 in FIG. And the temperature of the warm air blown out from the foot outlet 21 changes.

(When the degree of cooling of the air by the evaporator 6 is small) When the outside air temperature is between 5 and 25 ° C., the degree of cooling of the evaporator 6 is controlled by the economy control so that the post-evaporation temperature is between 3 and 11 ° C. Is controlled. And
When the post-evaporation temperature rises to 5 ° C. or higher, as shown in FIG. 7, the cooling adjustment damper is opened according to the increase in the post-evaporation temperature, and the opening degree of the air mix damper 42 is also increased according to the increase in the post-evaporation temperature. Corrected to open. By opening the cool air adjusting damper 32 in this way, the flow rate of the cool air passing through the cool air bypass passage 31 increases, and the evaporator 6
Even if the temperature rises, the temperature rise of the cool air blown out from the face outlet 20 can be suppressed. Specifically, for example, even if the post-evaporation temperature rises to 15 ° C., as shown by the dashed line B1 in FIG. 13, the temperature of the air blown from the face outlet 20 is the same as the conventional temperature (see the broken line C1 in the figure). It is kept low compared to Further, the opening degree θ0 of the air mix damper 42 is corrected in a direction in which the opening degree θ0 is opened in proportion to the increase in the opening degree θb of the cool air adjusting damper 32. As a result, the air mix damper 42 is closed according to the rise in the temperature after the evaporation, and the temperature of the foot outlet 21 is prevented from lowering.
Specifically, for example, even if the post-evaporation temperature rises to 15 ° C., as shown by the dashed line B2 in FIG. 13, the temperature of the air blown out from the foot outlet 21 is the conventional temperature (see the broken line C2 in the figure). It is kept high compared to

[Effects of the Embodiment] In the present embodiment, as described above, even if the temperature of the evaporator 6 rises under the economy control, the rise of the temperature blown out from the face outlet 20 is prevented. At the same time, a decrease in the temperature blown out from the foot outlet 21 is prevented. Therefore, even if the temperature of the evaporator 6 rises, the temperature of the cool air blown out from the face outlet 20 and the foot outlet 2
A large temperature difference from the temperature of the hot air blown out from the first air conditioner can be maintained, and the occupant can be provided with a comfortable air-conditioning state of head and foot heat. Further, when the amount of cool air passing through the cool air bypass passage 31 increases (operates in a direction in which the vehicle interior is cooled by the cool air blown out from the face outlet 20), the opening degree θ0 of the air mix damper 42 is corrected to open. (The temperature is corrected in a direction in which the vehicle interior is warmed by the warm air blown out from the foot outlet 21), and as a result, the temperature of the air blown out into the vehicle interior can be maintained at the target blowout temperature TAO.

[Modification] In the above embodiment, in the bi-level mode, when the air cooling degree of the cooling means becomes small,
Although the example in which the amount of air passing through the cool air bypass passage is increased or the amount of air passing through the heater core is increased, when a certain condition is satisfied (for example, only when the amount of solar radiation exceeds a predetermined value), The amount of air flowing through the cool air bypass passage and the amount of air flowing through the heater core may be further increased. An example in which the present invention is applied to a vehicle air conditioner having an auto air conditioner function for automatically maintaining the temperature in a vehicle cabin at a temperature set by a temperature setting device has been described. The present invention may be applied.

As an example of the cooling means, an evaporator of a refrigeration cycle in which a refrigerant is circulated has been described as an example, but other cooling means such as a refrigeration cycle using another medium such as air and a cooling means using a Peltier element are used. Is also good. As an example of the heating means, a heater core using cooling water as a heat source has been described as an example, but other heating means such as an electric heater (for example, a PTC heater) or a combustion heater may be used. As an example of the temperature control unit, an example in which the amount of air passing through the heating unit and the amount of bypass air are adjusted has been described.For example, when a heater core is used, the supply amount of cooling water may be adjusted. Other adjusting means may be used, such as adjusting the amount of energization when used, or adjusting the amount of combustion when using a combustion heater.

Although the temperature after evaporation is used as the means for detecting the degree of cooling of the cooling means, other means such as detecting the operating state of the cooling means (for example, the operating state of the compressor) may be used. Although the face outlet is shown as an example of the first outlet and the foot outlet is shown as an example of the second outlet, other outlets (for example, when applied to a bus vehicle, the first outlet is the first outlet).
The outlet may be applied to an overhead outlet, etc.).

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner for a vehicle (Example).

FIG. 2 is a graph showing an operation relationship between an outside air temperature and a post-evaporation temperature (Example).

FIG. 3 is a graph showing the relationship between the post-evaporation temperature and the operation of the compressor (Example).

FIG. 4 is a graph showing a relationship between a target outlet temperature TAO and an inside / outside air mode (Example).

FIG. 5 is a graph showing a relationship between a target blowing temperature TAO and a voltage applied to a blower (Example).

FIG. 6 is a graph showing a relationship between a target blowing temperature TAO and a blowing mode (Example).

FIG. 7 is a graph showing a relationship between a post-evaporation temperature and an opening degree of a cool air adjusting damper (Example).

FIG. 8 is a graph showing a relationship between a post-evaporation temperature and an opening degree of a cool air adjusting damper (variation example).

FIG. 9 is a graph showing the relationship between the post-evaporation temperature and the correction opening of the air mix damper (Example).

FIG. 10 is a graph showing a relationship between a post-evaporation temperature and a correction opening degree of an air mix damper (variation example).

FIG. 11 is a flowchart showing the operation of the control device (embodiment).

FIG. 12 is a subroutine for setting the opening of the cool air adjusting damper and the opening correction of the air mix damper (embodiment);

FIG. 13 is a graph showing a relationship between a target outlet temperature TAO and a temperature of air blown out from an outlet (Example).

FIG. 14 is a schematic view of an air conditioner capable of a bi-level mode (conventional example).

[Explanation of symbols]

2 control device (cool air bypass control means, temperature adjustment control means, bi-level mode detection means) 4 blower 5 duct 6 evaporator (cooling means) 20 face outlet (first outlet) 21 foot outlet (second outlet) 31 cool air bypass passage 32 cool air adjusting damper (cool air bypass amount adjusting means) 41 heater core (heating means) 42 air mix damper (temperature adjusting means) 63 post-evaporation sensor (cooling degree detecting means)

Continuation of front page (72) Inventor Tomohisa Yoshimi 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) B60H 1/00 102

Claims (2)

(57) [Claims] (A) A first air blower for blowing air into a vehicle interior.
A duct provided with an air outlet and a second air outlet, (b) a blower for generating an air flow in the duct toward the vehicle interior, and (c) a cooling means provided in the duct and cooling the air, (D) heating means provided in the duct downstream of the cooling means for heating the air; and (e) an amount of air heated by the heating means downstream of the cooling means in the duct and the heating means. Temperature adjusting means for adjusting an amount of bypass that bypasses the heating means. The air bypassing the heating means is mainly blown out from the first outlet, and the air heated by the heating means is mainly blown into the second air outlet. A vehicle air conditioner capable of bi-level mode operation of blowing air from an air outlet, comprising: (f) a cooling degree detecting means for detecting a cooling degree of air by the cooling means; (G) a bi-level mode detecting means for detecting whether or not the bi-level mode operation is being performed; and (h) bypassing the air branched from the duct and cooled by the cooling means, bypassing the temperature adjusting means. And the first
A cool air bypass passage directly leading to an air outlet; (i) a cool air bypass amount adjusting means for adjusting an amount of air passing through the cool air bypass passage; and (j) a cooling degree detecting means and a bi-level mode detecting means. As a result of being detected by these detecting means, the degree of cooling of the air by the cooling means is small, and the amount of air passing through the cool air bypass passage is increased when the bi-level mode operation is being performed. An air conditioner for a vehicle, comprising: a cool air bypass control means for controlling the cool air bypass amount adjusting means. 2. The cooling means is connected to the cooling degree detecting means and the bi-level mode detecting means, and as a result of detection by these detecting means, the degree of cooling of the air by the cooling means is small, and the bi-level mode operation is stopped. The air conditioner for a vehicle according to claim 1, further comprising a temperature adjustment control unit that controls the temperature adjustment unit so as to increase an amount of air heated by the heating unit when the operation is performed.