JP3306450B2 - Vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, and more particularly to a temperature control of an outlet temperature.

[0002]

2. Description of the Related Art Conventionally, as a vehicle air conditioner, Japanese Patent Publication No.
There is one described in JP-A-9-39333. This conventional apparatus describes a temperature control for automatically controlling the temperature in a vehicle interior to a set temperature, and specifically performs the following temperature control.

First, the temperature inside the vehicle compartment, the temperature outside the vehicle compartment,
Based on the set temperature in the cabin, required calorie data (referred to as a target outlet temperature TAO) to be sent into the cabin is calculated by a predetermined formula. Then, based on the target outlet temperature TAO, the heating capacity of the heater core as the heating heat exchanger (referred to as hot water temperature Tw), and the cooling capacity of the evaporator as the cooling heat exchanger (referred to as Te), The target opening (referred to as SW) of the air mix door for adjusting the temperature of the conditioned air is determined by a predetermined formula. In addition, the target opening S
W is calculated by the following equation 1, and the target outlet temperature TAO
Is calculated so that the temperature of the conditioned air increases as the value of. Further, the outlet mode is determined according to the target outlet temperature TAO.

[0004]

## EQU00001 ## SW = {(TAO-Te) / (TW-Te)}. Times.100 (%) Note that Te is the air temperature immediately after passing through the evaporator. Get higher.
In a normal vehicle air conditioner, in the bi-level mode for achieving head and foot heat, temperature control is performed such that hot air is blown from the foot outlet to the occupant's feet and cool air is blown from the face outlet to the upper body of the occupant. In order to do so, tuning of control specifications is performed.
Hereinafter, this tuning will be described with reference to FIG.

FIG. 6 shows the relationship between the target opening degree SW and the temperature of the conditioned air blown from the face outlet and the foot outlet. When the hot water temperature Tw is higher than a predetermined temperature TB (for example, 65 degrees), the relationship becomes as shown by a solid line in FIG. In the prior art, as a premise of temperature control, the case where the hot water temperature Tw is higher than the predetermined temperature TB is mainly set, and when the target opening degree SW of the air mix door is between SW1 and SW2,
The outlet temperature from the face outlet is lower than FACE1 and the outlet temperature from the foot outlet is FOOT1.
It is designed to satisfy the higher condition.

That is, in the bi-level mode, tuning is performed so that the target opening degree SW is limited to SW1 to SW2 so as to satisfy the above condition. Specifically, the blowing mode is determined according to the target blowing temperature TAO as shown in FIG.
Since the target opening SW is calculated in O, the target opening S
The target outlet temperature TAO where W can be SW1 to SW2
Is tuned so that the range (Ta to Tc) becomes the bi-level mode.

[0007]

However, in the prior art, as described above, the hot water temperature TW is reduced to the predetermined temperature TB.
When the hot water temperature TW is lower than the predetermined temperature TB, the temperature control characteristic is as shown by a dotted line in FIG. 6, and the above condition cannot be satisfied.

That is, when the hot water temperature TB is low, the target opening degree SW is large according to the above equation (HOT side in FIG. 6).
Therefore, even if the target outlet temperature TAO is the same, when the hot water temperature TW is lower than the predetermined temperature TB, the SW1 becomes SW1 'and the SW2 becomes SW1.
2 '. That is, the target outlet temperature TAO is low (T
In the case of a), since the target opening degree SW is SW1 ', the blowing temperature of the conditioned air from the foot outlet becomes lower than FOOT1 as shown by an arrow A in FIG. 6, and the occupant feels cold, There is a problem that head and foot fever is impaired. on the other hand,
When the target outlet temperature TAO is a high value (Tc),
Since the target opening degree SW is SW2 ', the temperature of the conditioned air blown out of the face outlet is FA as shown by the arrow B in FIG.
CE1 is higher than that of CE1, and the occupant feels burnt and there is a problem that head and foot fever is impaired.

In view of the above problems, it is an object of the present invention to perform temperature control suitable for an occupant's feeling when hot water temperature is lower than a predetermined temperature.

[0010]

In order to achieve the above object, according to the present invention, when the bi-level mode is set, the temperature (TW) of the heating fluid is increased to a predetermined temperature (TB). ), The target outlet temperature (T
The higher the AO), the lower the temperature of the conditioned air is controlled by the adjusting member (31), and the lower the target blowing temperature (TAO), the more the temperature of the conditioned air is controlled by the adjusting member. It is characterized in that it is controlled to be higher.

When the bi-level mode is set and the temperature of the heating fluid is lower than the predetermined temperature, the higher the target blowing temperature, the higher the adjustment member is indicated by an arrow C in FIG. As described above, the temperature of the air-conditioned air blown out from the face air outlet is controlled so as to be lowered, so that the head cold foot heat can be achieved and the occupant feeling can be improved. Then, as the target outlet temperature decreases, the temperature of the conditioned air from the foot outlet is controlled to be higher as indicated by an arrow D in FIG. ,
The feeling of the occupant can be improved.

According to the second aspect of the present invention, the correction is made such that the higher the target blow temperature (TAO), the higher the temperature (TW) of the heating fluid, and the lower the target blow temperature (TAO), the higher the heating fluid. Is corrected so that the temperature (TW) of
The adjusting member (31) is controlled based on the corrected temperature (TWD) of the heating fluid.

Thus, the same effect as the first aspect of the invention can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. First, the overall configuration of the present embodiment will be described with reference to FIG. Vehicle air conditioner 1
Is an air-conditioning case 2 in which conditioned air is introduced into a vehicle interior, and a blower 3 that introduces air into the case 2 and blows air into the vehicle interior.
And a refrigeration cycle 4 constituting a cooling means, a hot water circuit 5 constituting a heating means, and an air conditioner control device 6.

The branch cases 2a to 2c are connected to the air downstream side of the air conditioning case 2. The tip of the branch case 2a is connected to a defroster outlet 7 for blowing air toward the inner surface of the window glass 10 of the vehicle, and the tip of the branch case 2b is for blowing air toward the upper body of the occupant. Branch case 2 connected to face outlet 8
The tip of c is connected to a foot outlet 9 for blowing air toward the feet of the occupant.

Each of the outlets 7 to 9 has a branch case 2a to 2c.
It is opened and closed by the outlet switching doors 11 and 12 provided at the upstream opening of the air conditioner. The outlet switching doors 11 and 12 are
It is driven by a driving means 13 (see FIG. 2) such as a servomotor via a link mechanism (not shown). The blower 3 includes a blower case 3a, a centrifugal fan 3b, and a blower motor 3c as a driving means for the blower. The blower volume is determined according to the voltage applied to the blower motor 3c (blower voltage).

At the air inlet of the blower case 3a, an inside air inlet 14 for introducing vehicle interior air (hereinafter, inside air) into the air conditioning case 2, and outside vehicle interior (hereinafter, outside air) inside the air conditioning case 2. And an inside / outside air switching box 50 formed with an outside air introduction port 15 for introducing air. Further, the outside air inlet 15 is actually connected to an outside air inlet (not shown) opened to the upper cowl of the vehicle by an outside air introduction duct (not shown).

The inside / outside switching box 50 is provided with an inside / outside air switching door 16 driven by a driving means 17 (see FIG. 2) such as a servomotor. Air conditioning case 2 from 14
The amount of inside air introduced into the inside and the amount of outside air introduced into the air conditioning case 2 from the outside air inlet 15 are controlled.

The refrigeration cycle 4 constitutes a cooling heat exchanger for cooling the passenger compartment (air) and a well-known dehumidifying means for removing the fogging of the vehicle window glass 10. A refrigerant compressor 18, a refrigerant condenser 19, a receiver 20, a pressure reducing device 21, and a refrigerant evaporator 22 (hereinafter, an evaporator 22), and a refrigerant pipe 24
Connected by

The refrigerant compressor 18 is driven by a traveling engine 26 of the vehicle via an electromagnetic clutch 25 and compresses a gas refrigerant from the evaporator 22 into a high-temperature and high-pressure refrigerant. It is discharged to the container 19 side. The refrigerant condenser 19 receives the ventilation of the cooling fan 27 and condenses and liquefies the high-temperature and high-pressure refrigerant discharged from the refrigerant compressor 18. The receiver 20 separates the refrigerant from the refrigerant condenser 19 into gas and liquid and stores excess refrigerant in the refrigeration cycle 4.

The decompression device 21 decompresses and expands the liquid refrigerant from the receiver 20 to produce a low-temperature low-pressure refrigerant. Specifically, the decompression device 21 is designed so that the degree of superheat of the refrigerant flowing through the outlet pipe of the evaporator 22 is constant. It consists of a temperature-operated expansion valve that regulates the flow rate of the refrigerant passing through it. Evaporator 2
Numeral 2 is disposed in the air-conditioning case 2 and evaporates the low-temperature low-pressure refrigerant by heat exchange with air from the blower 3.

The hot water circuit 5 is disposed downstream of the evaporator 22 in the air-conditioning case 2, and circulates engine cooling water as a heat source to heat the air in the air-conditioning case 2. A heater core 28 as a vessel and a hot water pipe 29 connected to the heater core 28 are provided. The heater core 28 includes a bypass passage 3 through which the cool air from the evaporator 22 bypasses the heater core 28.
0 is formed in the case 2. The ratio of the amount of air passing through the heater core 28 and the amount of air passing through the bypass passage 30 in the cold air depends on the position of the air mixing door 31 which is provided upstream of the heater core 28 and is a temperature adjusting member. Adjusted.
The air mix door 31 is driven by a driving means 32 (see FIG. 2) such as a servomotor via a link mechanism (not shown).

The air-conditioner control device 6 includes a microcomputer in which a control program and various arithmetic expressions related to air-conditioning control are stored, a ROM, a RAM, an I / O port,
It is a well-known device having a built-in / D converter and the like (both not shown). As shown in FIG. 2, based on an operation signal output from an air conditioner operation panel 33 and detection signals from various sensors described later. , The above servo motors 13, 17,
Control signals are output to a motor drive circuit 32 for driving the blower motor 3c and a clutch drive circuit 35 for driving the electromagnetic clutch 25.

The above-mentioned various sensors pass through an inside air temperature sensor 36 for detecting the temperature of the inside air, an outside air temperature sensor 37 for detecting the temperature of the outside air, a sunshine sensor 38 for detecting the amount of solar radiation applied to the vehicle interior, and passing through the evaporator 22. A post-evaporator sensor 39 for detecting the air temperature immediately after the cooling, a water temperature sensor 40 directly attached to the outer surface of the heater core 28, and detecting the engine cooling water temperature are used.

The air conditioner operation panel 33 is provided on an instrument panel (not shown) in the vehicle compartment, and as shown in FIG. 2, a temperature setter 33 for setting a set temperature in the vehicle compartment.
a, and a blow mode setting switch (not shown) for switching the well-known blow mode by operation of the occupant. Next, the operation of the present embodiment will be described based on the flowchart of FIG.

When the ignition switch of the vehicle is turned on and power is supplied to the air conditioner control device 6, first, in step S1, various counters and flags are initialized and constants are set. Next, in step S2, the set temperature signal (Tset) of the temperature setting device 33a is read.
The D-converted values (Tr, Tam, Ts, Te, Tw) are read, and the states of various switches on the air conditioner operation panel 33 are read.

Next, in step S4, a target outlet temperature (hereinafter referred to as TAO), which is a target temperature (required heat amount data) of the conditioned air blown into the vehicle interior, is calculated based on the following equation (2).

[0028]

## EQU2 ## TAO = Kset × Tset−Kr × Tr−Kam ×
Tam−Ks × Ts + C Here, Kset, Kr, Kam and Ks are gains, respectively, and C is a correction constant. Next, in step S5, the suction port mode is determined based on the TAO. For example,
In this step S5, when the TAO calculated in step S4 is lower than a predetermined value, the inside air introduction port 14 is opened and the outside air introduction port 15 is closed, thereby introducing inside air into the air conditioning case 2. Mode is determined. on the other hand,
In step S5, the T calculated in step S4 is used.
When AO is higher than a predetermined value, the outside air introduction port is closed and the outside air introduction port 15 is opened, so that the outside air introduction mode in which outside air is introduced into the air conditioning case 2 is determined.

Next, in step S6, the above-mentioned step S4
The outlet mode is determined based on the TAO calculated in. For example, as TAO increases, the following face mode (FACE) and bilevel mode (B /
L), and the blowing mode is determined in the order of the foot mode (FOOT). Note that the FACE (face) mode is a mode in which conditioned air is blown out from the face outlet 8 and B / L
The (bi-level) mode is a mode in which conditioned air is blown out from both the face outlet 8 and the foot outlet 9.
The OOT (foot) mode is a mode in which conditioned air is blown out from the foot outlet 9.

Next, in step S7, the blower voltage to be applied to the blower motor 3c is determined, and in step S8, the target opening degree SW of the air mix door 31 is set so that the temperature of the air blown into the vehicle compartment becomes the above TAO. Is determined based on Equation 3 below.

[0031]

SW = {(TAO−Te) / (TWD−Te)} × 100 (%) Here, TWD in the equation 2 is obtained by converting (correcting) the detection signal TW of the water temperature sensor 40. The details will be described later. Next, in step S9, the operation of the refrigerant compressor 18 is determined. In this operation determination, if the temperature detected by the post-evaporator sensor 39 is 3 degrees or less, the refrigerant compressor 18 is stopped so that frost does not occur in the evaporator 22;
Activate

Next, in step S10, each of the servo motors 13, 17, 3 is controlled so that the above-mentioned control target value is obtained.
2. Motor drive circuit 34 and clutch drive circuit 35
To output a control signal. Then, in step S11,
It is determined whether or not a predetermined control cycle τ has elapsed, and if it has elapsed, the process returns to step S2, and if not, the control in step S11 is repeated until the above τ has elapsed.

Hereinafter, step S, which is an essential part of the present invention, will be described.
8 will be described with reference to the flowchart of FIG. In addition,
The air conditioner for a vehicle according to the present embodiment mainly sets when the hot water temperature Tw is higher than a predetermined temperature TB as shown in FIG. 6 described above, and when the target opening degree SW is between SW1 and SW2, the temperature of air blown out from the face outlet. Is lower than FACE1,
In addition, the condition that the outlet temperature from the foot outlet is higher than FOOT1 is satisfied.

That is, the outlet mode is determined according to the target outlet temperature Tao as shown in FIG. 4, and the target opening SW is calculated at the target outlet temperature TAO. Is tuned so that the range of the target blowout temperature TAO (Ta to Tc in FIG. 4) in which can be set to SW1 to SW2 is set to the bilevel mode.

Further, the above conditions can be satisfied because the face outlet 8 is arranged on the bypass passage 30 side and the foot outlet 9 is arranged on the heater core 28 side as shown in FIG. Is to be. That is,
This is because the cool air in the bypass passage 30 easily flows into the face outlet 8, and the warm air that has passed through the heater core 28 easily flows into the foot outlet 9.

As for the control contents in step S8, as shown in FIG. 5, first in step S8A, f (TAO) is determined according to the TAO. That is, when TAO is lower than Ta in FIG. 5 (same as Ta in FIG. 4), f
(TAO) becomes the upper limit value T1 ', and TAO becomes Ta in FIG.
ＴTc (the same as Ta〜Tc in FIG. 4), TA
It is determined that f (TAO) decreases as O increases. When TAO is lower than Tc in FIG.
(TAO) becomes the lower limit value TA. Therefore, step S8
At A, f (TAO) is in the range of Ta to Tb in FIGS.
That is, only when the outlet mode is determined to be the bi-level mode in step S6, it is determined to be lower as TAO becomes higher.

Next, in step S8B, as shown in FIG. 5, the higher the detection signal TW of the water temperature sensor 40 read in step S3 is, the higher the TWD is set. Here, as shown in FIG. 5, when the detection signal TW is higher than the above-mentioned predetermined temperature TB, TB becomes constant. On the other hand, when the detection signal TW is lower than the above-mentioned predetermined temperature TB, the TWD becomes lower as the TW becomes lower.
Is lower than the above f (TAO), TA (20 ° C.)
It will be constant.

That is, f determined in step S8A
(TAO) is the scale of the vertical axis in step S8B, and in step S8B, the scale f (TAO) is shifted in the horizontal direction in FIG. 5 according to the TAO. Therefore, for example, if TAO is high and f (TAO)
Is TA, the characteristic shown by the solid line in FIG. 5 is obtained. In this case, TWD and TW have a relationship of TWD = TW. Further, when TAO is low and f (TAO) is T1 ', the characteristic shown by the dotted line in FIG. 5 is obtained.

Thus, when the detection signal TW is higher than the predetermined temperature TB, even if the detection signal TW is the same,
The TWD differs depending on the TAO. As the TAO increases, that is, as f (TAO) decreases, the detection signal TW increases.
Is corrected so that the value corresponding to the temperature becomes higher, and T
Determined as WD. By doing so, the target opening S
W is corrected so that TWD becomes higher than the actual water temperature signal TW as the value of TAO becomes higher.
The air-conditioning air blowing temperature is determined to be low. As a result, the higher the TAO, the lower the temperature of the air-conditioned air blown out from the face air outlet as indicated by the arrow C in FIG. 6A, so that the head cold foot heat is achieved and the occupant feeling can be improved.

In other words, as TAO decreases, that is, as f (TAO) increases, the detection signal TW is corrected so that the value corresponding to its temperature decreases, and is determined as TWD. By doing so, the target opening degree SW is corrected so that as the TAO becomes lower, the TWD becomes lower than the actual water temperature signal TW in the above equation 3, so that the blowout temperature of the conditioned air becomes lower. It is determined.

As a result, the lower the TAO, the more
Thus, as shown by the arrow D, the temperature of the air-conditioned air blown out from the foot air outlet increases, so that cold head heat is achieved and the occupant feeling can be improved. (Other Embodiments) In the above embodiment, the air-conditioning air temperature adjustment type is described as an air mix type that mixes hot air and cold air. However, the present invention adjusts the hot water circulation flow rate of the heater core 28. Also, a reheat type device that adjusts the temperature of the conditioned air can be applied.

In each of the above embodiments, the scale f (TAO) in FIG. 5 is varied in accordance with the target blow temperature TAO. However, the present invention is not limited to this method. , A plurality of maps as shown in step S8B in FIG. 5 may be provided.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a control system of the vehicle air conditioner in the embodiment.

FIG. 3 is a flowchart showing the contents of air conditioning control in the embodiment.

FIG. 4 is a diagram showing a relationship between TAO and an outlet mode in the embodiment.

FIG. 5 is a flowchart showing TW correction according to TAO in the embodiment.

FIG. 6 is an explanatory diagram showing an effect in the embodiment.

[Explanation of symbols]

Reference numeral 22: evaporator, 28: heater core, 31: air mix door, 6: air conditioner control device.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masafumi Kawashima 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside DENSO Corporation (72) Inventor ▲ Hiro ▼ Yu Yu 1-1-1, Showa-cho, Kariya-shi, Aichi Share (72) Inventor Tomoyuki Kako 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-55-77659 (JP, A) JP-A-60-13805 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60H 1/00 101 B60H 1/00 103

Claims (4)

(57) [Claims] 1. A cooling heat exchanger for cooling air.
And a heating heat exchanger (28) provided downstream of the cooling heat exchanger (22) for heating the air. At least the vehicle interior temperature (Tr) and the vehicle interior setting Based on the temperature (TSET), a target outlet temperature (TAO) of the conditioned air blown into the vehicle compartment is calculated, and at least the target outlet temperature (TAO) and the heating fluid circulating through the heating heat exchanger (28). An adjusting member (31) for adjusting the temperature of the conditioned air is controlled based on the temperature (TW) of the occupant. The conditioned air is blown toward the upper body of the occupant and air-conditioned toward the lower body of the occupant. A vehicle air conditioner capable of setting a bi-level mode for blowing out wind, wherein when the bi-level mode is set, when the temperature (TW) of the heating fluid is lower than a predetermined temperature (TB), the target Outlet temperature ( AO) higher, the temperature of the conditioned air is adapted to control so as to be lower at the adjusting member (31), the target air temperature (TA
An air conditioner for a vehicle, wherein the lower the O), the higher the temperature of the conditioned air is controlled by the adjusting member. 2. The higher the target outlet temperature (TAO) is,
The temperature (TW) of the heating fluid is corrected so as to be higher,
The temperature (TW) of the heating fluid is corrected to be lower as the target outlet temperature (TAO) is lower. Based on the corrected temperature (TWD) of the heating fluid, the adjusting member (3) is adjusted.
The vehicle air conditioner according to claim 1, wherein 1) is controlled. 3. The adjusting member (31), wherein the blown air that has passed through the cooling heat exchanger (22) is air that bypasses the heating heat exchanger (28) and the heating heat exchanger. (28) an air mixing door (31) for adjusting a flow rate of air passing through the air, and controlling the temperature of the conditioned air based on at least the target outlet temperature (TAO) and the temperature (TW) of the heating fluid. The vehicle air conditioner according to claim 1 or 2, further comprising control means (6, 32) for controlling an operation position of the air mix door (31). 4. When the temperature (TW) of the heating fluid is higher than a predetermined temperature (TB), in the bi-level mode, a predetermined temperature (FA) is directed at least toward the upper body of the occupant.
The air conditioning system according to any one of claims 1 to 3, wherein the conditioned air (CE1) or less is blown, and the conditioned air (FOOT) or more is blown toward the lower body of the occupant. Vehicle air conditioners.