JPH05124416A - Air-conditioning device for vehicle - Google Patents

Abstract

PURPOSE:To provide an air-conditioning device for a vehicle in which a fluctuation in temperature in a car room owing to solar radiation can be suppressed without causing a cold feeling to a passenger. CONSTITUTION:Through regulation of a blower 2, an airflow of discharge air is varied and through regulation of the openings of air mix dampers 8 and 9 and a damper 17 for bypassing cold air, an discharge air temperature is varied. A controller 20 calculates a target discharge temperature in a state, in which no solar radiation is effected, from a set temperature Tset and internal and the external temperatures Tr and Tam of a vehicle and decides a fundamental airflow based on the target discharge temperature. The higher the set temperature Tset is, the lower a face set target discharge temperature is, and the controller calculates the face target discharge temperature according to a solar radiation amount detected by a solar radiation sensor 23 and calculates a face increase airflow by a heat balance formula to determine a face airflow from the face increase airflow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner, and more particularly to a vehicle air conditioner for controlling solar radiation correction.

[0002]

2. Description of the Related Art Conventional air conditioners for vehicles determine the blown air temperature and the like according to the set temperature and the outside and inside air temperature of the vehicle regardless of the presence or absence of solar radiation, but the outside air temperature is relatively low in spring and autumn. Nevertheless, the temperature inside the vehicle may fluctuate greatly depending on the presence or absence of solar radiation in the season when the solar radiation is strong.

[0003]

Therefore, it is necessary to detect the amount of solar radiation and maintain the vehicle interior temperature appropriately.
If the temperature of the blowing air is suddenly lowered because the amount of heat received by the solar radiation is large, there is a problem that the occupant who directly receives the blowing air feels a feeling of cold wind more than necessary and the comfort is impaired.

An object of the present invention is to provide an air conditioner for a vehicle which can suppress the variation of the temperature in the passenger compartment due to the solar radiation without giving the passenger a feeling of cool wind.

[0005]

According to the present invention, as shown in FIG. 11, the blower M1 is adjusted to set the blown air volume to a predetermined value, and the opening degree of the opening / closing damper M2 is adjusted. In a vehicle air conditioner that sets a temperature to a predetermined value, a solar radiation sensor M3 that detects the amount of solar radiation, and a non-solar radiation blower that calculates a non-solar radiation temperature based on the set temperature and the inside and outside temperature of the vehicle in the absence of solar radiation. A wind temperature calculating means M4, a non-solar radiation amount determining means M5 for determining the non-solar radiation amount under the non-solar radiation temperature, and a non-solar radiation temperature for correcting the non-solar radiation amount in the presence of the solar radiation. The insolation blowout air temperature calculation means M for calculating the insolation blowout air temperature lower according to the amount of solar radiation from the insolation sensor M3 and higher as the set room temperature is higher.
6, and the air flow rate correction value is calculated from the thermal equilibrium equation under the temperature of the air blown at the time of solar radiation, and the non-solar air flow rate is corrected by this air flow rate correction value to calculate the solar air flow rate of the air blown from the face outlet. The vehicle air conditioner provided with the solar radiation amount calculation means M7 is as its gist.

[0006]

The non-solar-air blowing air temperature calculating means M4 calculates the non-solar-air blowing air temperature based on the set temperature and the temperature inside and outside the vehicle in the absence of solar radiation. Determines the amount of non-solar radiation at the temperature of the blowing air. Further, the insolation blowout air temperature calculation means M6 corrects the non-insolation blowout air temperature by the insolation to calculate the insolation blowout air temperature that does not give the occupant a feeling of cool wind, and is comfortable even if the occupant is directly hit by the blowout air It does not spoil. Then, the insolation-time air volume calculation means M7 calculates the insolation-time air volume by correcting the non-insolation-time air volume by the thermal equilibrium equation under the insolation-time blowout air temperature, and prevents the vehicle interior temperature from largely fluctuating.

Further, the insolation blowout air temperature calculation means M6 calculates a lower insolation blowout air temperature as the set room temperature is higher. Therefore, for example, when the set temperature is changed to a higher direction, the heat received by the insolation is calculated. As a supplementary process, the face outlet temperature is lowered and the increase in air volume is suppressed. That is, when the set temperature rises, an increase in the air volume is suppressed by suppressing the rising tendency of the blowout temperature caused by increasing the set temperature, and the air volume control that matches the occupant's sense is performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of the vehicle air conditioner of this embodiment. A blower 2 is provided at the most upstream side of the duct 1.
The inside air or the outside air is supplied into the duct 1 by driving the blower 2. Switching between the inside air and the outside air is performed by the inside / outside air switching damper 3. Further, an evaporator 4 is arranged in the duct 1, a refrigerant is supplied by driving the refrigeration cycle, and air passing through the evaporator 4 is cooled by heat of vaporization of the refrigerant.

A heater core 5 is arranged in the duct 1 downstream of the evaporator 4. In FIG. 1, a first bypass passage 6 is formed above the heater core 5 in the duct 1, and a second bypass passage 7 is formed below the heater core 5. A plurality of tubes through which engine cooling water passes are erected on the heater core 5, and the tubes generate heat as the engine cooling water circulates, and heat is exchanged with the passing air. An air mix damper 8 is erected in the first bypass passage 6 so as to be openable and closable, and an air mix damper 9 is erected in the second bypass passage 7 so as to be openable and closable.
Then, by adjusting the openings of the air mix dampers 8 and 9, the ratio of the amount of air passing through the heater core 5 and the amount of air passing through the bypass passages 6 and 7 is adjusted.

Further, a face outlet passage 10, a differential outlet passage 11, and a foot outlet passage 12 are branched downstream of the heater core 5 in the duct 1, and the tip end openings thereof are the face outlet 13, the differential outlet 14, and the foot outlet. It is exit 15.

Further, the duct 1 is provided with a cold air bypass passage 16 for bypassing the heater core 5. That is, one end of the cold air bypass passage 16 opens between the evaporator 4 and the heater core 5 in the duct 1, and the other end of the cold air bypass passage 16 opens at a position close to the base end side opening portion of the face outlet passage 10. is doing. Further, a cool air bypass damper 17 is provided at the upstream side opening of the cool air bypass passage 16 in the duct 1, and the air supply amount to the cool air bypass passage 16 is adjusted by the opening of the damper 17. ing.

Face outlet passage 10 and differential outlet passage 1
A mode switching damper 18 is openably and closably provided at an opening portion on the base end side of the face blowing passage 1.
0 and the differential output passage 11 are selectively opened and closed. Further, a mode switching damper 19 is openably and closably provided at an opening portion on the base end side of the foot blow passage 12, and the foot blow passage 12 is opened and closed by the damper 19.

The controller 20 also includes an inside air sensor 2
1, outside air sensor 22, solar radiation sensor 23, temperature setter 24
Input the signal from. The inside air sensor 21 detects the air temperature (inside air temperature) Tr inside the vehicle, the outside air sensor 22 detects the air temperature outside the vehicle (outside air temperature) Tam, and the solar radiation sensor 23 detects the amount of solar radiation. Further, the temperature setting device 24 is arranged on the instrument panel in the passenger compartment, and the set temperature Tset can be set by the operation of the up / down switch 25 by the occupant. The controller 20 uses these signals to measure the inside temperature Tr, the outside temperature Tam, and the amount of solar radiation (the amount of heat received by the vehicle).
Detect Qs and set temperature Tset.

Further, the controller 20 drives and controls the air mix damper servomotor 26 and the cold air bypass servomotor 27 to control the openings of the air mix dampers 8 and 9 and the cold air bypass damper 17. In addition, the controller 20 is provided with the blower 2 via the blower controller 28.
To adjust the air volume. Furthermore, the controller 20
Is inside / outside air servomotor 29, mode switching servomotor 3
0 is controlled to open / close the inside / outside air switching damper 3 and the mode switching dampers 18 and 19.

In this embodiment, the air mix dampers 8 and 9 and the cold air bypass damper constitute an opening / closing damper for adjusting the temperature of the blowing air, and the controller 20 calculates the blowing air temperature during non-solar radiation, Non-insolation air flow rate determination means,
It constitutes a blowing-air temperature calculating means for solar radiation and an air-flow amount calculating means for solar radiation.

Next, the operation of the vehicle air conditioner thus constructed will be described. FIG. 2 shows the processing executed by the controller 20. The controller 20 reads the inside air temperature Tr by the inside air sensor 21, the outside air temperature Tam by the outside air sensor 22, and the set temperature Tset by the temperature setter 24 at step 101, and at step 102 sets the target outlet temperature TAOB under the condition without solar radiation (1). Calculate according to the formula.

TAOB = Kset.Tset-Kr.Tr-Kam.Tam + C (1) where Kset: temperature setting gain, Kr: inside air temperature gain, Kam: outside air temperature gain, C: correction constant.

Then, the controller 20 executes step 1
In 03, using the map shown in FIG. 3, the target outlet temperature TAO
From B, the basic air flow rate VA1 under the condition without solar radiation is determined. Next, in step 104, the controller 20 calculates the face basic target outlet temperature TV and the foot basic target outlet temperature TAH under the condition without solar radiation. That is, FIG.
As shown in, the face basic target outlet temperature TV is set to the set temperature Tset (25 in FIG. 4) with respect to the target outlet temperature TAOB.
The upper limit limiter is applied at a temperature of ℃) or less. In addition, the foot basic target outlet temperature TAH is set to 35 ° C. or higher, and the lower limit limiter is applied. In this way, the face outlet 13 does not blow out the air having a temperature equal to or higher than the set temperature Tset, and the foot outlet 15 does not blow out the air having a temperature of 35 ° C. or less.

Then, the controller 20 executes step 1
At 05, the face blowout temperature maximum decrease amount DT1 is calculated using the map of FIG. That is, in FIG. 5, the horizontal axis indicates the set temperature T.
Set is taken and the vertical axis shows the maximum decrease in face outlet temperature DT1
The higher the set temperature Tset, the larger the maximum face-blowing temperature decrease amount DT1. From this map, the maximum face blowout temperature decrease amount DT1 corresponding to the set temperature Tset is obtained.

Next, the controller 20 proceeds to step 10
6, the face blowing temperature decrease amount ΔT due to the vehicle heat receiving amount (solar radiation amount) Qs is determined using the map of FIG. At this time, the map shown in FIG.
_S is taken, and the vertical axis is the face blowout temperature decrease amount ΔT. The larger the vehicle heat receiving amount Q _S , the larger the face blowout temperature decrease amount ΔT is set, and the face blowout temperature maximum value obtained in step 105 is set. The upper limit limiter is set to operate at the decrease amount DT1.

Further, the controller 20 executes step 1
At 07, the face target outlet temperature TAV is calculated by solar radiation correction. That is, the sum of the target outlet temperature TAOB and the face outlet temperature decrease amount ΔT is set as the face target outlet temperature TAV (= TAOB + ΔT). In step 108, the controller 20 calculates the temporary outlet mode ratio P under the condition without solar radiation from the target outlet temperature TAOB, the set temperature Tset, and the foot basic target outlet temperature TAH using the equation (2).

P = (TAOB-Tset) / (TAH-Tset) (2) Here, the temporary outlet mode ratio P under the condition without solar radiation will be described.

As shown in FIG. 4, the foot basic target air outlet temperature TAH is set to 35 ° C. or lower and the face basic target air outlet temperature TV is set so as not to blow out air above the set temperature Tset. The remaining air volume other than the air volume is blown regardless of the capacity (TV> Tset, T in FIG. 4).
AH <35 (° C) wind), and the required air volume VAH = P · VA1 at the foot outlet 15 is the thermal equilibrium formula: Cp · γ · ( TAOB-Tr) * VA1 = Cp * [gamma] * (TAH-Tr) * P * VA1 P = (TAOB-Tr) / (TAH-Tr). Considering in a steady state, Tr (vehicle interior temperature) = Tset
Assuming (set temperature), the above equation (2) is derived.

Next, the controller 20 executes step 10
In step 9, the basic air volume VA1 and the temporary air outlet mode ratio P are multiplied to calculate the foot air volume VAH (= P · VA1), and in step 110, the vehicle heat receiving amount increment due to solar radiation is calculated by the wind from the face air outlet 13. In order to cancel, the increased air volume DVAV from the face outlet 13 due to solar radiation is calculated.

This process will be described in detail below. now,
Considering that the face target blowout temperature TAV and face blowout air volume (1-P) VA1 in the condition without solar radiation are stable, when the solar radiation is present, in order to secure the cooling capacity corresponding to the vehicle heat reception amount Qs due to the solar radiation, Target outlet temperature TAV
It is necessary to lower the air flow rate to increase the air volume from the face outlet 13. These ideas are expressed in the following formulas.
The constant pressure specific heat of air is Cp, and the specific weight of air is γ. (Amount of heat supplied with solar radiation)-(Amount of heat supplied without solar radiation) + Qs = 0 (3) (Amount of heat supplied with solar radiation) = C _P γ (TAV-Tr) ・ {(1- P) · VA1 + DVAV} (heat quantity supplied without solar radiation) = C _P · γ · (TAV-Tr) · (1-P) · VA1 (4) From the formulas (3) and (4),

[0026]

[Equation 1]

[0027]

[Equation 2]

[0028] Also, in the steady state, considering the above equation, Tr
= Tset (temperature inside the vehicle = set temperature), the following is obtained.

[0029]

[Equation 3]

(5) The increased air volume DVAV is calculated by the equation (5). After such processing, the controller 20 calculates the face air volume VAV by the equation (6) in step 111 of FIG.

VAV = (1−P) · VA + DVAV (6) Then, in step 112, the controller 20 adds the face air volume VAV and the foot air volume VAH to obtain the total air volume V.
A (= VAV + VAH) is calculated.

Next, the controller 20 proceeds to step 11
In step 3, the outlet mode ratio S after solar radiation correction is calculated by the equation (7). S = VAH / VA = VAH / (VAV + VAH) (7) When the air outlet mode ratio S is S ≦ 0, the controller 20 sets the face mode in which the air is blown from the face air outlet 13 to 0 <S <1. If so, the bi-level mode in which the air is blown out from both the face air outlet 13 and the foot air outlet 15 is set, and if S ≧ 1, the foot mode in which the air is blown out from the foot air outlet 15 is set.

The controller 20 outputs the target value thus obtained in step 114, and drives and controls each actuator so as to achieve this target value. That is, the air mix damper servo motor 26, the cold air bypass servo motor 27, the blower controller 28, and the mode switching servo motor 30 are driven to drive the air mix damper 8,
9, the opening degree of the cold air bypass damper 17, the blower 2
And the opening of the mode switching dampers 18 and 19 are controlled.

In FIGS. 7 and 8, the face target blowout temperature TAV (° C.) with respect to the set temperature Tset in the case where the face blowout temperature maximum decrease amount DT1 is set to a constant value regardless of the set temperature Tset without performing the process of step 105 is shown. And the face air volume VAV (m ³ / h). At this time, the outside temperature Tam is 35 ° C., the amount of solar radiation Qs is 1 kW / m ² , and the constants are Kset = 7.0, Kam = 1.1, Kr =
It was set to 3.0 and C = -45.0.

From FIGS. 7 and 8, although the target face outlet temperature TAV is increased by increasing the set temperature Tset, the face air volume VAV is also increased (because of the increase in the increased air volume DVAV). .. On the contrary, when the set temperature Tset is lowered, the face target outlet temperature TAV decreases, but the face air volume VAV also decreases. Usually, in an automatic air conditioner system, raising the set temperature Tset is "feeling cold", and the outlet temperature rises, and the air volume from the face outlet 13 is set to be unchanged or decrease. ing. However, the opposite tendency (with respect to the air flow rate) will occur, and the occupant will feel uncomfortable with the set temperature Tset.

That is, increasing the set temperature Tset
As a result, the face target outlet temperature TAV rises. Only
However, even if the set temperature Tset is raised, the vehicle is not exposed to sunlight.
Calorie Q _SIs constant, the amount of heat received by the vehicle Q_STo cancel the cold
There is no change in the cell ability value. The same with the outlet temperature rising
In order to achieve the same cooling capacity, work toward increasing the air volume.
To use. Therefore, the face air volume VAV increases.

On the other hand, in FIGS. 9 and 10, the set temperature T in the case where the process of step 105 is executed to make the maximum amount DT1 of decrease in face outlet temperature variable by the set temperature Tset is shown.
The target face outlet temperature TAV (° C.) and the face air volume VAV (m ³ / h) for the set are shown. As shown in FIGS. 9 and 10, when the set temperature Tset rises, the face air volume VAV decreases, and when the set temperature Tset falls, the face air volume VA.
The solar radiation correction air volume control is performed in accordance with the occupant's feeling that V increases. As described above, in the solar radiation correction control, when the set temperature Tset is changed, the air volume control that matches the occupant's sensation (when Tset is increased, VAV decreases or does not change.
If Tset is lowered, VAV can be increased or unchanged). That is, the increase in the air volume is prevented by suppressing the rising tendency of the face target outlet temperature TAV caused by increasing the set temperature Tset (the temperature is set low in order to achieve the same cooling capacity).

As described above, in this embodiment, the non-solar radiation temperature (target air temperature TAOB) is calculated from the set temperature Tset and the vehicle inside / outside air temperatures Tr and Tam in the absence of solar radiation, and the non-solar radiation temperature ( TAOB) Non-solarized air volume (basic air volume VA1) is determined, and the non-solarized air temperature is corrected from the solar radiation detected in the presence of solar radiation to insolate air temperature (face target air temperature TAV). In addition to calculating the air flow rate correction value (Face increase air volume DVAV) according to the thermal equilibrium equation (Equation (5)) under the temperature of the air blown at the time of solar radiation, the non-solar radiation air volume is corrected by the air volume correction value (DVAV). As a result, the temperature of the blowing air during insolation, which does not give the occupant a cool sensation, is calculated, and comfort is not impaired even if the blowing air directly hits the occupant. Hourly volume May vary vehicle interior temperature is greater because it calculates the solar radiation during the air volume correctness is prevented. Further, in the solar radiation correction control, it is possible to suppress an increase tendency of the face target blow-out temperature TAV by increasing the set temperature Tset, thereby suppressing an increase in the air volume and performing an air volume control that matches the sensation of the occupant when the set temperature Tset is changed. it can.

[0039]

As described in detail above, according to the present invention,
It is possible to suppress fluctuations in the vehicle interior temperature due to solar radiation without giving a cool sensation to the occupants, and it is also possible to make the blowing air temperature and the blowing air amount when the set temperature changes match the feeling. Exhibits excellent effects.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a vehicle air conditioner of an embodiment.

FIG. 2 is a flowchart for explaining the operation.

FIG. 3 is a map for explaining the operation.

FIG. 4 is a diagram for explaining a method of calculating a face basic target outlet temperature and a foot basic target outlet temperature.

FIG. 5 is a map for explaining the operation.

FIG. 6 is a map for explaining the operation.

FIG. 7 is a diagram showing a face target outlet temperature TAV with respect to a set temperature Tset.

FIG. 8 is a diagram showing a face air volume VAV with respect to a set temperature Tset.

FIG. 9 is a diagram showing a face target outlet temperature TAV with respect to a set temperature Tset.

FIG. 10 is a face air volume VAV with respect to a set temperature Tset.
FIG.

FIG. 11 is a claim correspondence diagram.

[Explanation of symbols]

2 Blower 8 Air mix damper which constitutes an open / close damper 9 Air mix damper which constitutes an open / close damper 13 Face outlet 17 A cool air bypass damper which constitutes an open / close damper 20 Non-solar radiation temperature calculating means, non-solar air volume determining means , A controller as a means for calculating the temperature of blown air during solar radiation and a means for calculating the amount of air during solar radiation 23 Solar sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takamasa Kawai 1-1, Showa-machi, Kariya city, Aichi Prefecture Nihon Denso Co., Ltd. (72) Inventor Yuji Honda, 1-1, Showa-cho, Kariya city, Aichi prefecture Nidec Co., Ltd. (72) Inventor Yuji Ito 1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd.

Claims (1)

[Claims] 1. An air conditioner for a vehicle, which adjusts a blower to set a blown air volume to a predetermined value, and adjusts an opening / closing damper to set a blown air temperature to a predetermined value. A solar radiation sensor, a non-solar radiation temperature calculating means for calculating the non-solar radiation temperature based on the set temperature and the temperature inside and outside the vehicle in the absence of solar radiation, and non-solar radiation under the non-solar radiation temperature. Non-solarized air flow rate determining means for determining the amount of hourly air flow, and in the presence of solar radiation, the non-solarized air temperature is corrected to correspond to the solar radiation amount by the solar radiation sensor, and the higher the set room temperature, the lower the solar radiation. An insolation blowout air temperature calculating means for calculating the hourly blowout air temperature, and an airflow correction value is calculated from the heat balance equation under the insolation blowout air temperature, and the non-insolation airflow amount is corrected by this airflow correction value. Air blown from the face outlet Air conditioning system characterized by comprising a solar radiation during air amount calculating means for calculating a solar radiation during air volume.