JPH06262927A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To reduce uncomfortable feeling toward the amount of correction of insolation in relation to a temperature set by a passenger, in an air conditioner for vehicle. CONSTITUTION:A cold air duct 21 for directly guiding cold air to a face blow- off port 11 from the upstream of a heat exchanger 5 for heating, is provided on a duct 2 for guiding blowing air into a car interior, and the amount of air to be guided into the cold air duct 21 from the duct 2 is adjusted by a cold air duct damper 22. The amount of correction of insolation is determined by an air conditioner controller 6 based on the insolation gain corresponding to a set temperature, and the activation of the cold air duct damper 22 is feedback-controlled so that the temperature of the air in the cold air duct 21 detected by a duct sensor 33 becomes the aimed blowdown temperature of the face blow-off port 11 determined from the amount of correction of insolation.

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 for performing solar radiation correction control.

[0002]

2. Description of the Related Art Conventionally, in a vehicle air conditioner, air-conditioning control is performed in which the amount of blown air is varied in consideration of the effect of solar radiation. Therefore, when the cooling operation (cool air is blown out from the face outlet) is performed in the summer when the solar radiation is affected, the amount of cold air blown out from the face outlet is increased according to the amount of solar radiation. It

[0003]

However, in the case of being affected by solar radiation in the winter when heating operation (hot air is blown from the foot outlet) is performed, the cooling operation is performed in order to suppress an increase in indoor temperature due to solar radiation. The cold air is not blown out from the face air outlet as at times, and control is performed to reduce the amount of air blown out from the foot air outlet (warm air) according to the amount of solar radiation. Therefore, the occupant's head feels hot due to the effects of solar radiation, and the feet feel cold due to the decrease in the amount of warm air, which causes a problem that the heating feeling deteriorates. The present invention has been made based on the above circumstances, and an object of the present invention is to provide an air conditioning apparatus for a vehicle that can reduce a sense of discomfort in the amount of solar radiation correction with respect to a set temperature set by an occupant.

[0004]

In order to achieve the above object, the present invention, as shown in FIG. 9, has a heat quantity changing means 100 for changing the heat quantity given to the upper body of an occupant, and a solar radiation for detecting the amount of solar radiation. An amount detecting means 110; and an insolation correction amount calculating means 120 for calculating an insolation correction amount that increases the amount of heat for cooling the upper half of the occupant as the amount of insolation detected by this insolation amount detecting means 110 increases. Temperature setting means 130 for setting the set temperature in the vehicle compartment, and this temperature setting means 1
The solar radiation correction amount setting means 140 that sets the solar radiation correction amount calculated by the solar radiation correction amount calculating means 120 to be smaller as the set temperature set by 30 becomes higher, and the solar radiation correction amount setting means 140 sets the solar radiation correction amount. The technical means includes the control means 150 for controlling the heat quantity varying means 100 based on the correction amount.

[0005]

In the vehicle air conditioner of the present invention having the above structure, when the amount of solar radiation is detected by the amount of solar radiation detection means, the larger the amount of solar radiation detected by the amount of solar radiation correction amount calculation means, the upper body of the occupant. After the solar radiation correction amount for increasing the amount of heat for cooling the vehicle is calculated, the solar radiation correction amount setting means calculates the solar radiation correction amount calculated by the solar radiation correction amount calculation means as the set temperature in the passenger compartment increases. The amount is set small. Then, the control means controls the heat amount varying means based on the solar radiation correction amount set by the solar radiation correction amount setting means. Thus, for example, the amount of solar radiation correction obtained by the amount of solar radiation correction amount setting means becomes larger during cooling in summer when the set temperature is lower than that during heating in winter, and the amount of solar radiation correction obtained during heating is set by the amount of solar radiation correction amount setting means. The correction amount becomes small. Therefore, when there is solar radiation during cooling, the amount of heat for cooling the upper body of the occupant becomes large (for example, the temperature of the blown air blown to the upper body of the occupant decreases or the amount of blown air increases), thereby suppressing the effect of solar radiation. be able to.
Further, when there is solar radiation during heating, the amount of solar radiation correction is smaller than that during cooling, so the amount of heat for cooling the upper body of the occupant can be suppressed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vehicle air conditioner of the present invention will be described with reference to FIGS. FIG. 1 is an overall schematic view of a vehicle air conditioner. The vehicle air conditioner 1 according to the present embodiment includes a duct 2 that guides blown air into the vehicle compartment, a blower 3 that introduces air into the duct 2 and sends the air into the vehicle compartment, and a heat exchange for cooling provided in the duct 2. The air conditioner 4 and the heating heat exchanger 5, the air conditioner control device 6 and the like are provided. The downstream end of the duct 2 is branched into a defroster duct 7, a face duct 8, and a foot duct 9, and the ends of the ducts 7 to 9 open into the vehicle interior. It is said that. Each duct 7-9
At the upstream side opening portions, outlet outlet switching dampers 13, 14, 15 for opening and closing the respective ducts 7 to 9 are provided. The blower 3 includes a fan case 3a and a centrifugal fan 3
b, a fan motor 3c, and is arranged at the upstream end of the duct 2. The fan case 3a is formed with an inside air introduction port 16 for introducing air inside the vehicle (inside air) and an outside air introduction port 17 for introducing outside air (outside air) outside the vehicle compartment, and the inside air introduction port 16 and the outside air introduction port 17 are provided. An inside / outside air switching damper 18 that selectively opens and closes is provided.

The cooling heat exchanger 4 is a refrigerant evaporator of a refrigeration cycle, and performs heat exchange between the air in the duct 2 and a low-temperature, low-pressure refrigerant so that the air passing through the cooling heat exchanger 4 is removed. Cooling. The heat exchanger 5 for heating is arrange | positioned in the duct 2 at the downstream (leeward) of the heat exchanger 4 for cooling, and heats the air which passes the heat exchanger 5 for heating using engine cooling water as a heat source. The heating heat exchanger 5 is arranged so as to form a bypass path 19 in which air flowing in the duct 2 bypasses the heating heat exchanger 5, and both sides of the heating heat exchanger 5 (wind A pair of air mix dampers 20 arranged on the upper side and the leeward side adjust the ratio between the amount of air passing through the heating heat exchanger 5 and the amount of air passing through the bypass passage 19. A cold air duct 21 is connected to the outside of the duct 2 for guiding the cool air flowing in the duct 2 from the upstream (upwind) of the heating heat exchanger 5 directly to the face duct 8. The cool air duct 21 has an upstream side opening between the cooling heat exchanger 4 and the heating heat exchanger 5 in the duct 2, and a downstream side opening near the face outlet 11 of the face duct 8. A cold air duct damper 22 that adjusts the amount of air introduced into the cold air duct 21 from inside the duct 2 is provided at the upstream opening of the cold air duct 21. This cold air duct damper 22 is used for the cold air duct 2 in the bi-level mode.
The air temperature in 1 is the target outlet temperature T of the face outlet 11.
Feedback control is performed so as to be AV (described later).

The air conditioner control device 6 includes a ROM 6a, RA
A microcomputer including an M6b and a CPU 6c, based on an operation signal output from an air conditioner operation panel (not shown) and a detection signal from each sensor (described later), each damper (air outlet switching dampers 13, 14,
15, inside / outside air switching damper 18, air mix damper 2
0, a control signal is output to each of the servo motors 23, 24, 25, 26 for driving the cold air duct damper 22) and the motor drive circuit 27 for driving the fan motor 3c. The ROM 6a is a read-only memory, and stores various arithmetic expressions, various data, a predetermined control program, and the like. The RAM 6b is a memory that can freely read and write data, and is used to temporarily hold data that appears during processing. CPU 6c
It is a central processing unit that performs various calculations and processes based on a control program stored in the ROM 6a.

The above-mentioned sensors include an inside air sensor 28 that detects the temperature inside the vehicle and outputs it as an inside temperature Tr, an outside air sensor 29 that detects an outside temperature of the vehicle and outputs it as an outside temperature Tam, and an amount of solar radiation to detect the amount of solar radiation. The solar radiation sensor 30 that outputs Ts ′, the after-evaporation temperature sensor 31 that detects the blown-air temperature of the cooling heat exchanger 4 and outputs as the after-evaporation temperature Te, and the engine cooling water temperature that is supplied to the heating heat exchanger 5 A water temperature sensor 32 that detects and outputs the cooling water temperature Tw, and an air temperature in the cold air duct 21 that detects the duct temperature Td.
It is the duct sensor 33 or the like that outputs as. The air conditioner operation panel is provided on an instrument panel (not shown) in the passenger compartment and includes a temperature setting device 34 for setting the passenger's desired indoor temperature by operating the up / down switch 34a. The temperature set by the temperature setting device 34 is output to the air conditioner control device 6 as the set temperature Tset.

Next, the operation of this embodiment relating to the solar radiation correction control will be described based on the processing procedure of the air conditioner control device 6. FIG. 2 is a flowchart showing a processing procedure of the air conditioner control device 6. First, the temperature setter 34 and the inside air sensor 2
8. From the outside air sensor 29, the solar radiation sensor 30, the after-evaporation temperature sensor 31, the water temperature sensor 32, and the duct sensor 33, the set temperature Tset, the inside air temperature Tr, the outside air temperature Tam, the amount of solar radiation Ts', the after-evaporation temperature Te, and the cooling water temperature, respectively. Tw and the temperature Td in the duct are read (step S1). Next, the solar radiation gain G corresponding to the set temperature Tset is obtained from the graph shown in FIG. 3 (stored in the ROM 6a), and based on the solar radiation gain G, the control target value of the solar radiation amount Ts' is calculated from the following mathematical formula 1. T
s is calculated (step S2).

[Formula 1] Ts = G · Ts ′ The above-mentioned solar radiation gain G becomes the solar radiation gain G = 1 when the set temperature Tset is 25 ° C. or less, and the output value (Ts ′) of the solar radiation sensor 30 remains the control target value. Used as Ts, when the set temperature Tset is 30 ° C or higher, the solar radiation gain G =
It is set to 0 and the solar radiation correction is not performed. When the set temperature Tset is in the range of 25 ° C to 30 ° C, the solar radiation gain G changes linearly according to the set temperature Tset.

Next, based on the respective data input in step S1, the target outlet temperature TAOB 'in the absence of solar radiation is calculated by the following equation 2 (step S3).

## EQU00002 ## TAOB '= Kset.multidot.Tset-Kr.Tr-Kam.Tam + C where Kset is a temperature setting coefficient, Kr is an inside air temperature coefficient, Kam is an outside air temperature coefficient, and C is a correction constant. Subsequently, the weighting variable F for solar radiation correction corresponding to TAOB ′ calculated in step S3 is determined from the graph (stored in the ROM 6a) shown in FIG. 4 (step S
4). This weighting variable F becomes F = 1 when TAOB ′ is T ₁ or less (face mode when there is no solar radiation), and the basic target outlet air temperature TA calculated by Equation 3 described later is obtained.
When the term of solar radiation is set in OB and TAOB ′ is T ₂ or more (foot mode when there is no solar radiation), F = 0 and the term of solar radiation is removed from the basic target outlet temperature TAOB.
That is, TAOB = TAOB '. Therefore, TAO
When B'is T ₁ or less, solar radiation correction is performed by adjusting the opening of the 100% air mix damper 20, and TAOB '
Is T ₂ or more, the solar radiation correction is the air mix damper 2
It is not performed by adjusting the opening degree of 0, but the solar radiation correction is performed by decreasing the increased air volume of the face outlet 11 and the target outlet temperature TAV of the face outlet 11.

After the variable F is determined, the basic target outlet air temperature TAOB is calculated by the following equation 3 (step S5).

## EQU00003 ## TAOB = TAOB'-F.Ks.Ts where Ks is a solar radiation coefficient. Next, in order to realize the TAOB calculated in step S5, the target opening degree SW of the air mix damper 20 is calculated by the following formula 4 (step S6).

## EQU00004 ## SW = (TAOB-Te) .times.100 / (Tw-Te) (%) Next, from the graph (stored in the ROM 6a) shown in FIG. The blowout temperature reduction width DT is calculated (step S7), and the reduction width D is calculated.
Based on T, the target outlet temperature TAV of the face outlet 11 in the bilevel mode is calculated by the following equation 5 (step S8).

[Formula 5] TAV = Tset + DT Therefore, in the bi-level mode, the target outlet temperature TAOB of the foot outlet 12 and the target outlet temperature TAV of the face outlet 11 are compatible with each other.

Next, from the graph shown in FIG. 6 (stored in the ROM 6a), the TAO calculated in step S5 is calculated.
Basic air volume (blower voltage) VM1 of blower 3 based on B
Is determined (step S9). Next, from the graph shown in FIG. 7 (stored in the ROM 6a), the face outlet 1 at the time of maximum solar radiation (about 1 Kw / m ² ) with respect to TAOB
The increased air volume DVMmax of 1 is calculated, and this increased air volume DVMma
Based on x, the increased air volume DVM of the face outlet 11 with respect to the control target value Ts is calculated by the following equation 6 (step S10).

[Equation 6] DVM = (Ts / Tsmax) · DVMmax where Tsmax: Ts value at the time of maximum solar radiation, 0 ≦ (Ts / T
smax) ≦ 1.

Next, based on the graph shown in FIG. 8 (stored in the ROM 6a), the basic mode ratio P (0: face mode, 1: foot mode, 0 to 0) of the face outlet 11 and the foot outlet 12 with respect to TAOB. 1: Bi-level mode) is determined (step S11). This step S
Using the basic mode ratio P determined in 11, the blowout air volume VM of the face outlet 11 is calculated from the following Equations 7 and 8.
V and the blowing air volume VMH of the foot outlet 12 are calculated, and the final mode ratio S is determined from the following equation 9 based on the face air volume VMV and the foot air volume VMH (step S1).
2).

[Equation 7] VMV = (1−P) · VM1 + DVM

[Equation 8] VMH = P · VM1

[Equation 9] S = VMH / (VMV + VMH)

Next, the face air volume VMV and the foot air volume VMH are added (Equation 10 below) to calculate the total air volume (final blower voltage) VM (step S13).

## EQU10 ## VM = VMV + VMH Next, the final mode ratio S determined in step S12 is determined (step S14), and when the determination result is S = 0 (face mode) and S = 1 (foot mode). )
Sets the opening degree of the cold air duct damper 22 to fully closed in step S15 and step S16, respectively, and
When the determination result of 14 is 0 <S <1 (bilevel mode)
In step S17, the opening degree of the cold air duct damper 22 is set based on the target outlet temperature TAV of the face outlet 11. Then, a control signal is output to each of the servo motors 23 to 26 and the motor drive circuit 27 so that each target value can be obtained, and the opening degree of the air mix damper 20, the opening degree of the cold air duct damper 22, and the outlet switching damper 13 are output. , 14, 1
The opening degree of 5 and the blowing amount of the blower 3 are controlled (step S18).

As described above, the solar radiation sensor 30 detects the amount of solar radiation T.
When s'is detected, the control target value Ts of the solar radiation amount Ts' corresponding to the set temperature Tset is obtained, and the target outlet temperature TAV of the face outlet 11 calculated based on the control target value Ts is obtained. Thus, the opening of the cold air duct damper 22 is feedback-controlled while the air temperature in the cold air duct 21 is detected by the duct sensor 33. Specifically, when the set temperature Tset is 25 ° C. or lower, the solar radiation gain G = 1, and the solar radiation amount Ts ′ detected by the solar radiation sensor 30 is directly the solar radiation correction amount (lowering the temperature of the face outlet 11). Width and increased air volume of face outlet 11)
Is used as the control target value Ts for obtaining the solar radiation gain G in the range of the set temperature Tset from 25 ° C to 30 ° C.
Changes from 1 to 0, the control target value Ts changes linearly according to the set temperature Tset. For this reason,
When the set temperature Tset shows a relatively low value of 25 ° C. or less, if the solar radiation amount Ts ′ detected by the solar radiation sensor 30 is the same value, the solar radiation correction amount does not change with the set temperature Tset, but the set temperature does not change. When Tset is different in the range of 25 ° C to 30 ° C, even when the amount of solar radiation Ts' detected by the solar radiation sensor 30 shows the same value, the effect of solar radiation is canceled when the set temperature Tset is low. Therefore, the amount of solar radiation correction is large, and the amount of solar radiation correction is controlled to be smaller when the set temperature Tset is higher.

When heating is required such that the set temperature Tset exceeds 30 ° C. (for example, during maximum heating), cool air is blown from the face air outlet 11 to cancel the influence of solar radiation, so that the face air outlet 11 is discharged. It is better to prevent the heating effect from being reduced by blowing out cool air. Therefore, when the set temperature Tset is 30 ° C or higher, the solar radiation gain G
= 0 and the solar radiation correction control is not performed. As described above, in the present embodiment, the solar radiation correction control is performed by increasing the air volume of the face outlet 11 and decreasing the target outlet temperature TAV of the face outlet 11, so that the foot outlet 12 can be operated when there is solar radiation during heating. Since it is possible to prevent the heating feeling from deteriorating due to the reduction of the hot air volume, and to change the solar radiation gain G in accordance with the set temperature Tset, it is possible to change the solar radiation correction amount with respect to the set temperature Tset. It is possible to reduce the discomfort of the amount of solar radiation correction with respect to the set temperature Tset.

[Modification] In the present embodiment, an example in which the solar radiation gain is changed with respect to the set temperature is shown. However, the increase air volume of the face air outlet 11 or the blowout temperature decrease width of the face air outlet 11 is changed. Thus, the amount of solar radiation correction may be varied with respect to the set temperature.

[0019]

According to the vehicle air conditioner of the present invention, by varying the amount of solar radiation correction depending on the temperature set by the occupant, it is possible to reduce the discomfort of the amount of solar radiation correction with respect to the set temperature.

[Brief description of drawings]

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

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

FIG. 3 is a graph showing the relationship between solar radiation gain and set temperature.

FIG. 4 is a graph showing a relationship between a target outlet temperature when there is no solar radiation and a weighting variable for solar radiation correction.

FIG. 5 is a graph showing a relationship between a target control value of an amount of solar radiation and a blowout temperature reduction range.

FIG. 6 is a graph showing a relationship between a target outlet temperature and a basic air volume of a blower.

FIG. 7 is a graph showing the relationship between the target outlet temperature and the face-increasing air volume during maximum solar radiation.

FIG. 8 is a graph showing a relationship between a target outlet temperature and an outlet mode ratio.

FIG. 9 is a block diagram showing a configuration of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Air conditioner for vehicle 6 Air-conditioner control device (solar radiation correction amount calculation means, solar radiation correction amount setting means, control means) 22 Cold air duct damper (heat amount variable means) 30 Solar radiation sensor (solar radiation amount detection means) 34 Temperature setting device (setting means) )

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yuji Honda, 1-1, Showa-cho, Kariya city, Aichi Prefecture, Nihon Denso Co., Ltd. (72) Inventor, Yuji Ito, 1-1, Showa-cho, Kariya city, Aichi prefecture Incorporated (72) Inventor Sugimitsu 1-1, Showa-cho, Kariya city, Aichi Prefecture

Claims (1)

[Claims] 1. A) heat quantity changing means for changing the quantity of heat given to the upper body of an occupant; b) solar radiation quantity detecting means for detecting the amount of solar radiation; and c) large solar radiation quantity detected by this solar radiation quantity detecting means. The solar radiation correction amount calculating means for calculating the solar radiation correction amount for increasing the heat amount for cooling the upper half of the occupant, d) the temperature setting means for setting the set temperature in the passenger compartment, and the e) temperature setting means The solar radiation correction amount setting means for setting the solar radiation correction amount calculated by the solar radiation correction amount calculation means to be smaller as the set temperature set in step f is increased; and f) The solar radiation correction amount set by this solar radiation correction amount setting means. And a control means for controlling the heat amount varying means based on the above.