JPH0840040A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To provide a solar radiation sensor and correction control which can negate influence by reflection of light by front glass and have detecting characteristics undependent on the incident direction of solar radiation light. CONSTITUTION:A light detecting part 105 is divided in a fan shape into two parts, and is composed of a first light detecting part 52a and a second light detecting part 52b to generate a signal according to the light receiving quantity. The first light detecting part 52a receives solar radiation incident from a solar radiation attenuating area, and the second light detecting part 52b receives solar radiation incident from an area except it. When a solar radiation detecting value of the first light detecting part 52a is denoted by Tsa and a solar radiation value of the second light detecting part 52b is denoted by Tsb, when the solar radiation detecting value Tsa is large by comparing the solar radiation detecting value Tsa and the solar radiation detecting value Tsb with each other, a judgment is made that it is made incident from the solar radiation attenuating area, and the solar radiation detecting value Tsa is doubled by alpha.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar radiation sensor and a solar radiation sensor configured to cancel the influence of light reflection on the surface of the windshield when detecting the solar radiation transmitted through the windshield. It relates to the solar radiation amount correction control using.

[0002]

2. Description of the Related Art In recent air conditioners for automobiles, the intensity of solar radiation (hereinafter referred to as "solar intensity") is detected by a solar radiation sensor, and the air temperature of the air conditioner or the temperature of the air outlet is detected by the solar radiation detection value of the solar radiation sensor. There is one that is adapted to perform solar radiation correction control for correcting the air volume. In this device, the solar radiation sensor is arranged on the dashboard near the windshield, and the solar radiation sensor that detects the solar radiation transmitted through the windshield.

[0003]

However, when solar light passes through the windshield, reflection of light occurs on the surface of the windshield. This amount of reflected light increases as the angle between the surface of the windshield and the incident direction of the solar radiation decreases, and the amount of light received by the solar sensor decreases within a certain range (solar radiation attenuation region) where this angle exists, and the solar radiation intensity is reduced. There is a problem that it is detected weaker than it actually is. In particular, in the case of an air conditioner for automobiles, the angle formed by the windshield and the incident direction of solar radiation changes each time the vehicle traveling direction changes, and the amount of reflected light on the windshield changes, so the same altitude is maintained. Even with intense sunlight
There is a problem that the detection output of the solar radiation sensor changes each time the vehicle traveling direction changes, and the solar radiation correction control for air conditioning operation becomes inaccurate.

In view of the above problems, the present invention can cancel the influence of the reflection of light on the windshield,
It is an object of the present invention to provide a solar radiation sensor and correction control that can realize a detection characteristic that does not depend on the incident direction of solar radiation.

[0005]

In order to achieve the above-mentioned object, the present invention is installed in the vicinity of a windshield, and among the solar radiation transmitted through the windshield, at least the solar radiation incident from the solar radiation attenuation region. A solar light detection value increasing means for correcting the solar radiation detection value detected by the first light detection unit to increase the solar radiation detection value. Is adopted as a technical means.

Further, the vehicle air conditioner is installed in the vicinity of the windshield, receives the solar light incident from other than the solar radiation attenuation region, and generates a signal according to the received light amount. The solar radiation detection value increasing means compares the solar radiation detection value of the first photodetector and the solar radiation detection value of the second photodetector to obtain the solar radiation detection value of the second photodetector. When the solar radiation detection value of the first photodetector is larger,
It is adopted as a technical means to correct the solar radiation detection value of the first photodetector so as to increase it.

Further, it is adopted as a technical means that the first photo-detecting section and the second photo-detecting section are configured to divide one flat plate into at least two parts. The first
Above the photodetector and the second photodetector, the first
It is adopted as a technical means that a light guiding section for guiding the sunlight is arranged in the light detecting section and the second light detecting section.

Further, the first photo-detecting section and the second photo-detecting section employ a technical means for varying the relative positional relationship between them according to the mounting position of the solar radiation sensor.

[0009]

According to the configuration of the invention described above, the first photodetector determines the amount of received solar light, which is incident from at least the solar radiation attenuation region, of the solar light transmitted through the windshield. Generates a corresponding signal. Then, the solar radiation detection value increase correction unit corrects the solar radiation detection value detected by the first detection unit so as to increase.

Therefore, even if there is a circumstance in which the solar radiation incident from the solar radiation attenuation region is weaker than the actual solar radiation intensity, the solar radiation detection value increase correction means increases the solar radiation detection value of the first light detecting section. , It is possible to cancel the reflection of solar radiation on the windshield. Further, with the configuration according to claim 2, the second photodetector receives the solar light incident from other than the solar radiation attenuation region, and generates a signal according to the amount of received light. Then, the solar radiation detection value increasing means compares the solar radiation detection value of the first light detection unit with the solar radiation detection value of the second light detection unit, and determines the first light radiation from the solar radiation detection value of the second light detection unit. When the solar radiation detection value of the detection unit is large, the solar radiation detection value of the first light detection unit is corrected to increase.

That is, by comparing the detected solar radiation value of the first photodetector and the detected solar radiation value of the second photodetector, it can be determined whether or not the solar radiation is actually incident from the solar radiation attenuation region. The detection characteristic of the sensor does not depend on the incident direction of solar radiation, the air-conditioning state according to the environmental condition is obtained, and the occupant can drive comfortably.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. First, an overall configuration diagram of the vehicle air conditioner will be described. The vehicle air conditioner of the present embodiment is equipped with an automatic air conditioner function for automatically maintaining the temperature of the vehicle interior at the set temperature, and the vehicle air conditioner is roughly classified into
It is composed of an air conditioning unit 100 and a control means 22 for controlling each functional component of the air conditioning unit 100.

[Description of Air Conditioning Unit 1] Air Conditioning Unit 1
Reference numeral 00 denotes an air passage for guiding air into the vehicle compartment, specifically, the duct 1, air inside the vehicle interior (inside air) and air outside the vehicle interior (outside air).
Inside / outside air switching means 101 for selecting which of the two is taken into the duct 1, a blower 102 for sending the air selected by the inside / outside air switching means 101 to the passenger compartment, and a blower driving means for driving the blower 102. 5, cooling means 6 for cooling the air flowing in the duct 1, and heating means 13 for heating the cold air cooled by the cooling means 6.
And a heating amount adjusting means 103 for adjusting the temperature of the air blown into the vehicle compartment from the duct 1.

The inside / outside air switching means 101 is provided at the air suction port of the blower 102, and the duct 1 is provided by the blower 102.
The inside air is introduced into the duct 1 so as to introduce the inside air into the duct 1, and the outside air is communicated with the outside to form the duct for the outside air. 1, an outside air inlet 4b for introducing into
Further, the inside / outside air switching damper 2 is provided as an inside / outside air opening / closing means for selectively opening / closing the inside air introducing port 4a and the outside air introducing port 4b. The inside / outside air switching damper 2 is driven by an inside / outside air opening / closing drive means 2a, specifically, a servomotor, and has an inside air circulation mode for introducing inside air from the inside air inlet 4a and an outside air from the outside air inlet 4b. Is switched to the outside air introduction mode for introducing the.

The blower 102 is provided in the duct 1 at a location on the air downstream side of the inside / outside air switching means 101 and generates an air flow in the duct 1 toward the passenger compartment. The blower 102 includes a fan 3, a blower driving unit 5, specifically, a fan motor. The blower driving unit 5 rotationally drives the fan 3 in accordance with a voltage applied from a blower driving circuit 5a to remove the inside air or the outside air. It is sent to the passenger compartment through the duct 1.

The duct 1 is arranged in front of the passenger compartment, and a face outlet 16 for blowing out cool air mainly toward the upper body of the passenger in the passenger compartment, and a passenger compartment in the air downstream side portion of the duct 1. A foot outlet 17 for mainly blowing out warm air toward the feet of the occupant and a defroster outlet 15 for mainly blowing out warm air toward the windshield 21 and the side glass are provided. Further, outlet opening / closing means for selectively opening / closing these outlets, specifically, duct switching dampers 18 to 20 are provided. The duct switching dampers 18 to 20 are driven by an outlet opening / closing driving means, specifically, servomotors 18a to 20a.

The cooling means 6 is an evaporator which is a component of the refrigeration cycle 7, and more specifically an evaporator. The evaporator 6 is arranged in the duct 1 and cools the air passing therethrough. The refrigeration cycle of this example is
From the evaporator 6 to the refrigerant compressor, specifically the compressor 8, the condenser, specifically the condenser 9, the gas-liquid separator,
Specifically, it is a well-known device in which a refrigerant is introduced into an evaporator 12 via a receiver 10 and a decompression / expansion device, specifically, an expansion valve 11. The compressor 8 is connected to an electromagnetic clutch (not shown), and the torque of the engine is transmitted by energizing the coil of the electromagnetic clutch.

The heating means 13 is specifically a heater core 13 which is provided in a part of the air downstream side of the evaporator 6 in the duct 1 and heats the air passing therethrough using engine cooling water as a heat source. Heating amount adjusting means 103
Specifically, the bypass passage 14 that bypasses the heater core 13 and the air distribution amount of the cool air passing through the evaporator 6 to the heater core 13 and the air distribution amount to the bypass passage 14 that are provided in the air upstream side portion of the heater core 13 are provided. It is composed of an air mix damper 12 for adjusting the amount of passing air. The air mix damper 12 is driven by an air mix damper driving means 12a, specifically, a servomotor.

[Description of Control Means 22] The control means 22 is
An ECU that controls each electric functional component of the above-described air conditioning unit 100, and includes a CPU (not shown), a ROM (not shown), and a RAM (not shown). Note that R
A program for air conditioning control is stored in the OM, and CP is stored based on the air conditioning information temporarily stored in the RAM.
U performs various calculations and processing.

The input terminals J to Q of the ECU 22 are provided on an operation panel 34 operated by a vehicle occupant, and an inside / outside air manual setting means for manually setting the inside / outside air mode, specifically, an inside / outside air switching manual switch 23, a vehicle. A temperature setter 24 for setting the temperature inside the room, a blower outlet manual setting means for manually setting the blowout mode, specifically a blowout mode setting switch (not shown), an inside air temperature detecting means for detecting the temperature of the air inside the vehicle, Specifically, the inside air temperature sensor 26, the outside air temperature detecting means for detecting the temperature of the air outside the vehicle compartment, specifically the outside air temperature sensor 27, the solar radiation amount detecting means for detecting the amount of solar radiation entering the vehicle interior, specifically Is the degree of cooling in the solar radiation sensor 29 and the evaporator 6, specifically, the degree of cooling that detects the temperature of the air immediately after passing through the evaporator 6 (hereinafter referred to as the post-evaporation temperature). Detecting means, in particular it is connected to a water temperature sensor 28 for detecting a cooling water temperature of the post-evaporator sensor 30, the heater core 13.

The input terminals G and I of the ECU 22 detect the opening degree detecting means for detecting the opening degree of the air mix damper 12, specifically, the air mix damper opening degree detection sensor 12b and the energizing current flowing through the coil of the electromagnetic clutch. Drive circuit 8a. The output terminals A to H of the ECU 22 are connected to the servomotors 2a, 12a, 18a to 2a.
0a, the blower drive circuit 5a, and the drive circuit 8a.

When the occupant operates an auto switch (not shown) by the occupant to select the auto air conditioner, the ECU 22 keeps the inside and outside air so that the temperature inside the passenger compartment is maintained at the temperature set by the temperature setter 24. Automatically controls the mode, outlet temperature, air volume, and outlet mode. Here, the solar radiation sensor 29 which is an embodiment of the present invention will be described in detail.

In general, the solar radiation sensor 29 is arranged on the dashboard on the inner surface of the windshield (inside the vehicle interior), but its arrangement position varies depending on the design of the vehicle. . FIG. 3 is a schematic view of the windshield 21 when viewed from above. The portion indicated by reference numeral B is the hood of the vehicle, the portion indicated by reference numeral D is the dashboard, and the portion indicated by reference numeral I is the vehicle interior.

As shown in this figure, the solar radiation sensor 29
Are mounted at arbitrary positions such as a position 70a close to the side glass, a front position 70b of the driver, a central position 70c in the vehicle width direction, and a position 70d close to the left side glass. Here, FIG. 4 shows the detection characteristics of the conventional solar radiation sensor when the conventional solar radiation sensor is attached to the mounting position 70a. This conventional solar radiation sensor detects the solar radiation intensity with only one phototransistor element. In addition, the experimental conditions are a solar elevation angle of 40 ° and a solar radiation intensity of 8
The solar radiation detection value at the time of incidence from the front of the vehicle was set to 1 from 0 to 900 W / m ² .

Looking at the results of this experiment, the sunlight IR entering from the right side of the vehicle and the sunlight IL entering from the left side of the vehicle
Comparing with, even if the amount of solar radiation is the same, part of the solar radiation IL is reflected on the surface of the windshield 21, and the amount of solar radiation IL passing through the windshield 21 is attenuated. Therefore, the solar radiation sensor 29 detects the solar radiation intensity by the solar radiation IL weaker than it actually is. That is, no matter what solar radiation sensor is used, if the mounting position is 70a, in the solar radiation from the left side of the windshield between 30 ° and 120 °,
It can be seen that the detected value of the solar radiation of the solar radiation sensor is in the solar radiation amount attenuation region. Therefore, in the present invention, the solar radiation sensor 2 as described below is used.
It has a configuration of 9.

The solar radiation sensor 29 shown in FIG. 3 is shown in FIG.
FIG. 1 (b) is an enlarged view of FIG.
The solar radiation sensor 29 is mounted on the mounting position 70a described above.
It is attached to. A circular recess 700 is formed at the mounting position 70 a of the dashboard D, and the sensor case 50 is arranged in the recess 700.

The inside of the sensor case 50 is in the shape of a circular dish, and the disc-shaped light detecting portion 105 is disposed on the bottom surface thereof. The light detection unit 105 is formed of a disc-shaped photoelectric conversion element, specifically, amorphous silicon, and generates a photocurrent (signal) according to the amount of received light. A light shielding plate 51 is attached to the upper part of the sensor case 50 so as to cover the light detection unit 105. Then, this light shielding plate 51
A circular light introduction hole 51a that guides sunlight is provided in the center of the
Of the solar light that has passed through the windshield, only the solar light that has passed through the light introduction hole 51a is incident on the photodetector 105. In addition, the light-shielding plate 51 constitutes a light guide portion.

The photo-detecting section 105 is divided into two in a fan shape, and the first photo-detecting section 5 generates a signal according to the amount of received light.
2a and the 2nd photon detection part 52b. The first photodetector 52a and the second photodetector 52b are arranged so that the first photodetector 52a receives the solar radiation incident from the solar attenuating region and the second photodetector 52b is other than the solar attenuating region. The relative positional relationship is determined so as to receive the solar radiation incident from.

Specifically, the relative positional relationship is determined based on the experimental result shown in FIG. 4, and in the case of the mounting position 70a, the direction of solar radiation is in the range of -60 ° to -150 ° (arrow X in FIG. 1a).
This range is -60 ° because the range indicated by
It is set so that the solar light incident from the direction of −150 ° is incident on the first photodetector 52a via the light shielding plate 51. That is, the first photodetector 52a occupies a quarter of the disc-shaped photodetector 105.

As can be seen from FIG. 4, the range of −30 ° to −60 ° and the range of −120 ° to −180 ° are actually the solar radiation attenuation region, but −30 ° to −60 °. In this range, the amount of solar light attenuation is small, so it is not considered here. Further, in the range of -120 ° to -180 °, the occupant is not directly exposed to the sunlight, or the sunlight is actually blocked by the roof of the vehicle, and the sunlight is incident on the first light detection unit 52a. Although not expected, the first photodetector 52a
Receives a small amount of solar radiation (solar radiation, which will be described later). However, this solar radiation is so small that it is not considered here.

The mounting position of the solar radiation sensor 29 is 70d.
In this case, the relative positional relationship between the first photodetector 52a and the second photodetector 52b is bilaterally symmetrical to that of the mounting position 70a as shown in FIG. Further, when the mounting position of the solar radiation sensor 29 is 70c, the solar radiation sensor 29 is divided into three as shown in FIG. 6, and the third photodetector 55a located on the right side with respect to the vehicle traveling direction is located on the left side. Fifth light detector 55
c and a fourth photodetector 55b that receives other solar radiation, and has a bilaterally symmetrical configuration.

The third photodetector 55a and the fifth photodetector 55c receive the solar radiation incident from the solar radiation amount attenuation region, and when the mounting position is 70c, there are two solar radiation attenuation regions. That is. Here, the third photodetector 55a and the fifth photodetector 55c constitute a first photodetector, and the fourth photodetector 55b constitutes a second photodetector.

Further, the mounting position of the solar radiation sensor 29 is 70
In the case of b, the solar radiation sensor 29 has a configuration as shown in FIG. 7 because the solar radiation amount attenuation region is displaced because the shape of the windshield 21 is more horizontal than that of 70a. in this way,
By changing the relative positional relationship of the respective photodetection units constituting the solar radiation sensor 29 according to the mounting position of the solar radiation sensor 29, only the solar radiation incident from the solar radiation amount attenuation region can be received.

Next, the control contents of the vehicle air conditioner using this solar radiation sensor 29 will be explained based on the flow chart of FIG. The solar radiation sensor 29 is attached to the attachment position 70a. First, when the power is turned on, the ECU 22 performs initialization processing of data, timers, etc. in step 200.

Next, in step 300, the operation panel 3
4, the temperature setting signal Tset from the temperature setter 24, the vehicle environmental condition that affects the air conditioning state in the vehicle compartment, that is, the inside air temperature signal Tr from the inside air temperature sensor 26, the outside air temperature signal Tam from the outside air temperature sensor 27, the evaporator Rear sensor 30
The post-evaporation temperature signal Te and the water temperature signal Tw from the water temperature sensor 28 are read and stored. Further, the output value T _sa of the second photodetector 52a and the detection value T _sb of the third photodetector 52b of the solar radiation sensor 29 are read and stored.

Subsequently, in step 400, step 3
The actual insolation intensity T based on T _sa and T _sb stored in 00
Calculate s. Details of step 400 will be described later. Next, at step 500, in order to perform the automatic air conditioner control, based on the signals read at step 300 and step 400, the target outlet temperature T
AO is calculated by the following formula 1.

[0037]

[Equation 1] TAO = A / Tset-B / Tr-C / Tam-D
-Ts + E Note that A, B, C, D, and E are correction constants. Next, in step 600, the target opening degree θ0 of the air mix damper 10 is calculated by the following mathematical expression 2.

[0038]

## EQU2 ## θ0 = {(TAO-Te) / (Tw-Te)}
× 100 (%) Next, in step 600, the inside / outside air mode is determined based on the characteristics shown in FIG. 9. Here, as shown in FIG. 5, TAO = −15 ° in the process of increasing the target outlet temperature TAO.
At C, it switches from the inside air circulation mode to the outside air introduction mode,
In the process of lowering the target outlet temperature TAO, TAO = -2
At 0 ° C, the outside air introduction mode is switched to the inside air circulation mode.

Further, the blower drive circuit 5a determines the voltage applied to the fan motor 3 based on the characteristic shown in FIG. Further, in step 600, a face mode (FACE) that blows air from the face outlet 16 based on the characteristics shown in FIG. 11, a foot mode (FOOT) that blows wind from the foot outlet 17, and the face outlet 1
7 and the bi-level mode (B / L) in which the air is blown from the foot outlet 15 is determined.

In step 700, the servomotor 2a, the servomotors 18a to 20a, and the servomotors 18a to 20a are provided so that the results obtained in steps 300 to 600 can be obtained.
A control signal is output to the blower drive circuit 5a and the servo motor 12a to control the air conditioning in the vehicle compartment. In this subroutine, when step 700 ends and the control cycle time τ elapses, steps 300 to 700 described above are repeated again.

Next, the details of step 400 described above will be explained based on the subroutine shown in FIG. It should be noted that this subroutine is executed at the same time when step 300 is completed, and step 500 is executed at the same time when this subroutine is completed. Further, here, the mounting position 70a
The case will be described. First, in step 410,
The first photodetector 52a and the second photodetector 5 of the solar radiation sensor 29
The solar radiation detection values T _sa and T _{sb of} 2b are compared. That is, it is determined whether the solar radiation detection value T _sa is larger than the solar radiation detection value T _sb by a predetermined value T1.

Here, for example, in the case of lateral solar radiation from the left side of the windshield 21, the solar radiation is not only incident on the first photodetector 52a of the solar radiation sensor 29, but is also influenced by diffuse reflection by clouds or air. (Sky insolation) is solar radiation sensor 2
It also enters the second photodetector 52b of No. 9. However, since the solar radiation detection value of the second photodetection unit 52b due to sky solar radiation is very small, the difference between T _sa and T _sb becomes large when the solar radiation is actually incident from the solar radiation attenuation region.

That is, step 410 is a solar radiation attenuation region determining means for determining that solar radiation is incident from the solar radiation attenuation region. If the determination result in step 410 is YES, that is, if it is determined that the solar radiation is incident from the solar radiation attenuation region, the process proceeds to step 420. If the determination result is NO, the solar radiation is incident from other than the solar radiation attenuation region. If it is determined that there is a difference, the process proceeds to step 430.

In step 420, the attenuation of the solar radiation detection value T _sa of the first photodetector 52a of the solar radiation sensor 29 is corrected. Here, the solar radiation detection value T _sa is multiplied by α (for example, 1.5 times).
By multiplying by 2), the corrected solar radiation detection value Ts is calculated so as to obtain the actual solar radiation intensity, the process proceeds to step 500, and the target outlet temperature TAO is calculated based on the correction solar radiation detection value Ts.

In step 430, the corrected solar radiation detection value Ts
Is set as the solar radiation detection value T _sa and the process proceeds to step 500. Here, in step 420, the solar radiation detection value increasing means is configured. Further, the steps described above constitute means for realizing each function. In addition, the mounting position of the solar radiation sensor 29 is 7
In the case of 0d and 70b, the same control as 70a is performed using the solar radiation sensor 29 shown in FIGS.

Further, the mounting position of the solar radiation sensor 29 is 70c.
The control contents of the vehicular air conditioner in the above case will be described based on the flowcharts of FIGS. 6 and 20. In this example, only the steps 300 and 400 of FIG. 8 differ in the control contents in the case of the mounting position 70a described above. In step 300, the solar radiation detection values T _sa , T _sb , and T _sc of the third light detection unit 55a, the fourth light detection unit 55b, and the fifth light detection unit 55c of the solar radiation sensor 29 are read and stored.

Next, in step 411, the solar radiation detection value T
_It is determined whether _sa is larger than the solar radiation detection value T _sc . That is, since there are two solar radiation attenuation regions, it is determined whether or not light is incident on the windshield 21 from the right solar radiation attenuation region or the left solar radiation attenuation region. Then, if this determination result is YES, that is, if it is determined that the solar radiation is incident from the left solar radiation attenuation area, the process proceeds to step 421. If NO, that is, the solar radiation is incident from the right solar radiation attenuation area. If it is determined that there is, the process proceeds to step 431.

Next, in step 421, in the same way as step 410 described above, first, in step 421,
It is determined whether the solar radiation detection value T _sa is larger than the solar radiation detection value T _sb by a predetermined value T1. That is, it is again determined whether the solar radiation is the left solar radiation attenuation region or the right solar radiation attenuation region. When the determination result of this step 421 is YES, it progresses to step 451, and when this determination result is NO, it progresses to step 441.

In step 451, the attenuation of the solar radiation detection value T _sa of the third photodetector 55a of the solar radiation sensor 29 is corrected. Here, the solar radiation detection value T _sa is multiplied by α (for example, 1.5 times).
By multiplying by 2), the corrected solar radiation detection value Ts is calculated so as to obtain the actual solar radiation intensity, the process proceeds to step 500, and the target outlet temperature TAO is calculated based on the correction solar radiation detection value Ts.

In step 441, the corrected solar radiation detection value Ts
Is set as the solar radiation detection value T _sa and the process proceeds to step 500. Also,
The flow chart after step 431 is step 42.
Since the process proceeds in the same way as 1 to 451, the description is omitted here. It should be noted that step 451 constitutes means for increasing the detected solar radiation value, and the other steps constitute means for realizing each function.

As described above, even if the mounting position of the solar radiation sensor 29 on the vehicle is various, the photodetector is arranged so as to detect only the solar radiation incident from the solar radiation attenuation region, and this solar radiation detection value and other It can be determined that the solar radiation is attenuated by comparing it with the solar radiation detection value, and the actual solar radiation intensity can be calculated by increasing and correcting the solar radiation detection value of the photodetector. As a result, it is possible to cancel the influence of the reflection of light on the windshield, obtain an air-conditioned state according to environmental conditions, and allow the occupant to drive comfortably.

In the first embodiment, the solar radiation sensor 2
9 is composed of the light shielding plate 51 in which the light introducing hole 51a is formed, and a plurality of divided light detecting portions. However, as shown in FIG. 14, the light detecting portion 81 (for example, a single Crystalline silicon or amorphous silicon) and a light transmitting material, specifically, a filter 82. The filter 82 has a large light transmittance 82a and a small light transmittance 8a.
The area 82b may be divided into two areas 2b and the area 82b having a small light transmittance may be arranged in the solar radiation attenuation area. (FIG. 14 shows the mounting position 70a) In the first embodiment, the first photodetector 105 is divided into two or three parts according to the mounting position.
It is also possible to divide the region further finely and change the correction coefficient α according to the divided region to perform the correction with higher accuracy.

When a solar radiation sensor that is used for zone air conditioning control and can detect the direction of solar radiation is used, the solar radiation detection value of the solar radiation sensor is corrected according to the solar radiation direction (solar radiation attenuation region). You can do it. Also, FIG.
As shown in FIG. 5, when a solar radiation sensor composed of a sixth light detection unit 92a and a seventh light detection unit 92b which are symmetrically divided into two with respect to the traveling direction of the vehicle is used, T _{sa of} each solar radiation detection value is used. , T _sb output ratio gives the approximate direction of solar radiation. That is, as shown in FIG. 16, the smaller the incident angle is, the larger the difference between the solar radiation detection values T _sa and T _sb becomes, and it is understood that the solar radiation is incident from the solar radiation attenuation region due to this difference. Accordingly, the influence of the reflection on the windshield 21 can be canceled by correcting the solar radiation detection value T _sa or T _sb for detecting the solar radiation from the solar radiation attenuation region so as to increase.

It is also possible to perform the control described below by using a solar radiation sensor as shown in FIG. FIG. 17 shows a flowchart when the mounting position of the solar radiation sensor is 70a. In this example, in the control content in the case of the mounting position 70a described above, step 40 in FIG.
Only 0 is different. Further, in this case, the seventh detection light unit 92a receives the solar radiation incident from the solar radiation attenuation region.

First, in step 412, the sixth photodetector section
Total solar radiation detection by 92a and the 7th light detection part 92b
Value T_sa+ T_sbIn contrast, the solar radiation detected by the sixth light detection unit 92a
Detection device T_saDetermine whether the ratio of is greater than the predetermined value T2
Set. That is, T_sa+ T _sbTo pair T_saOf
Is larger than the predetermined value T2, the seventh photodetection from the solar radiation attenuation region
It is determined that there is an incident on the outgoing portion 92a. this
If the determination result is YES, the process proceeds to step 422 and NO.
In the case of, the process proceeds to step 432.

In step 422, the total solar radiation detection value T _sa +
The corrected solar radiation detection value Ts is calculated by multiplying T _sb by α. In this example, since the solar radiation sensor is simply divided into two symmetrically with respect to the traveling direction of the vehicle, the sixth photodetection unit 92a also detects solar radiation outside the solar radiation attenuation region. As a result, the corrected solar radiation detection value Ts cannot be calculated based only on T _sb as in the first embodiment, so the total solar radiation detection value T _sa + T _sb is multiplied by α. As a result, the influence of the reflection on the windshield 21 can be canceled even by using a solar radiation sensor that is symmetrical with respect to the traveling direction of the vehicle.

If the mounting position of the solar radiation sensor is 70d, the total solar radiation detection value T _sa + T _sb detected by the sixth light detecting unit 92a and the seventh light detecting unit 92b is detected in step 412, and the seventh child is detected. The same correction control can be performed by determining whether or not the ratio of the solar radiation detector T _sb detected by the unit 92b is larger than the predetermined value T2. Further, in the case of a vehicle air conditioner using an omnidirectional solar radiation sensor that is composed of three or more photodetection units and can accurately detect the solar radiation elevation angle Φ1, the solar radiation direction Φ2, and the solar radiation intensity I, By performing the control as described above, further detailed correction can be performed.

FIG. 17 shows the control contents of this vehicle air conditioner. In addition, here, it is assumed that a solar radiation sensor having three light detection units is used. In addition, this flowchart is step 3 in the flowchart of FIG. 8 described above.
Only 00 to step 400 is different. First,
In step 300, the temperature setting signal Tset, the inside air temperature signal Tr, the outside air temperature signal Tam, the post-evaporation temperature signal Te, the water temperature signal Tw, and the solar radiation output values T _sa , T _sb , and T of the three photodetection units of the solar radiation sensor 29. Read and remember _sa .

Next, at step 350, the solar radiation elevation angle Φ1, the solar radiation direction Φ2, and the solar radiation intensity I are calculated from the solar radiation detected values T _sa , T _sb , and T _sa . Next, in step 400,
The corrected insolation amount is determined based on the insolation elevation angle Φ1, the insolation direction Φ2, and the insolation intensity I calculated in step 350 by the relational expression shown in FIG. Here, α _nm is a correction coefficient, which varies according to a preset map as shown in FIG. That is, since the amount of solar radiation attenuation differs depending on the solar elevation angle Φ1 and the solar radiation direction Φ2, more detailed control can be performed by setting α _nm in accordance with each amount of solar radiation attenuation.

[Brief description of drawings]

FIG. 1A is a diagram showing a configuration of a solar radiation sensor at a mounting position 70a according to a first embodiment of the present invention. (B) It is a figure which shows the vehicle mounting state of the solar radiation sensor shown in FIG. 1a.

FIG. 2 is an overall configuration diagram of a vehicle air conditioner using the solar radiation sensor shown in FIG. 1a.

FIG. 3 is a diagram showing a mounting position of a solar radiation sensor in the first embodiment.

FIG. 4 is a diagram showing a solar radiation attenuation region when a conventional solar radiation sensor is attached to a mounting position 70a.

FIG. 5 is a diagram showing a structure of a solar radiation sensor at a mounting position 70d of the first embodiment.

FIG. 6 is a diagram showing a configuration of a solar radiation sensor at a mounting position 70c of the first embodiment.

FIG. 7 is a diagram showing a configuration of a solar radiation sensor at a mounting position 70b of the first embodiment.

FIG. 8 is a view showing a flowchart of a vehicle air conditioner using the solar radiation sensor of the first embodiment.

FIG. 9 is a characteristic diagram showing the relationship between the target outlet temperature TAO and the inside / outside air mode in the first embodiment.

FIG. 10 is a target outlet temperature TAO in the first embodiment.
FIG. 6 is a characteristic diagram showing a relationship between the voltage applied to the fan motor and the voltage applied to the fan motor.

FIG. 11 is a target outlet temperature TAO in the first embodiment.
It is a characteristic view which shows the relationship between a blowout port mode.

FIG. 12 is a flowchart showing the solar radiation correction control in the first embodiment (mounting position 70a).

FIG. 13 is a flowchart showing the solar radiation correction control in the first embodiment (attachment position 70c).

FIG. 14 is a diagram showing the configuration of another solar radiation sensor according to the present invention.

FIG. 15 is a diagram showing a configuration of another solar radiation sensor according to the present invention.

16 is a diagram showing a solar radiation detection characteristic of the solar radiation sensor shown in FIG.

17 is a flowchart showing solar radiation correction control using the solar radiation sensor shown in FIG.

FIG. 18 is a detailed view of a main part of the flowchart shown in FIG.

FIG. 19 is a characteristic diagram showing a relationship among a solar radiation elevation angle Φ1, a solar radiation direction Φ2, a solar radiation intensity I, and a correction coefficient α _nm .

[Explanation of symbols]

 21 windshield 22 control means 52a first photodetector 52b second photodetector 55a third photodetector (first photodetector) 55b fourth photodetector (second photodetector) 55c fifth photodetector (First light detector)

Claims (5)

[Claims] 1. A solar cell which is installed in the vicinity of a windshield, receives at least solar light incident from a solar radiation attenuation region among solar light transmitted through the windshield, and generates a signal according to the received light amount. An air conditioner for a vehicle, comprising: one photodetector; and a solar radiation detected value increasing means for correcting the solar radiation detected value detected by the first light detector so as to increase. 2. The vehicle air conditioner is installed in the vicinity of a windshield, receives a solar light incident from a region other than the solar attenuating region, and generates a signal according to the received light amount. The solar radiation detection value increasing means compares the solar radiation detection value of the first photodetector and the solar radiation detection value of the second photodetector to obtain the solar radiation detection value of the second photodetector. When the solar radiation detection value of the first photodetector is larger, the correction is performed so as to increase the solar radiation detection value of the first photodetector.
The vehicle air conditioner described. 3. The solar radiation sensor according to claim 1, wherein the first photodetection unit and the second photodetection unit are configured to divide one flat plate into at least two parts. 4. A light guide unit for guiding solar light to the first photodetector and the second photodetector is disposed above the first photodetector and the second photodetector. The solar radiation sensor according to claim 2, wherein: 5. The solar radiation sensor according to claim 2, wherein a relative positional relationship between the first light detection unit and the second light detection unit is variable according to a mounting position of the solar radiation sensor.