JPS61200021A - Car air conditioner with solar radiation compensating device - Google Patents

Abstract

PURPOSE:To enable the optimum control of the compensation of solar radiation by detecting the intensity and the direction of an incident light upon the inside of a car by means of a solar radiation sensor which is formed by a light intensity sensor and a direction sensor, and making compensating control of air conditioning in accordance with the detected output. CONSTITUTION:A light intensity sensor 2 and direction sensors 3a, 3b are arranged in a line and the direction D of an incident light is divided into two angular components alpha, beta and detected. A sensor of which the sensitivity is not changed according to changes in the incident directions alpha, beta, and whose output VI1 is proportionate to the intensity I of light of a point light source 1, is used for the sensor 2. A sensor of which the sensitivity is changed according to changes in a alpha while not changed according to changes in beta, and whose output VDa is proportionate to the intensity I of light, is used for the sensor 3a. And, a sensor of which the sensitivity is changed according to changes in beta while not changed according to changes in alpha, and whose output VDb is proportionate to the intensity I of light, is used for the sensor 3b. The VDa, VI1, and VDb are measured by 6a-6c to obtain, alpha, beta, I. Then, commands based on these are given to an actuator 9 to carry out compensation of solar radiation considering incident directions.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an air conditioner for a vehicle, and particularly to an air conditioner equipped with a solar radiation correction device that corrects and controls the operating state of the air conditioner in accordance with solar radiation incident into a vehicle interior. The present invention relates to an air conditioner for automobiles.

[Background of the invention]

Conventionally, solar radiation sensors are provided on the driver's seat side and the passenger's seat side in the vehicle interior, and each solar radiation sensor detects solar radiation jtt- which is larger than a predetermined amount of solar radiation.
Japanese Patent Laid-Open No. 59-16 discloses that when a detection is detected, the direction of the air outlet is changed so that cold air is blown toward the passenger on the sensor side.
It is known as 0617.

However, in this type of control, the incident direction of solar radiation is detected based on the amount of solar radiation, so the solar radiation sensor detects solar radiation from an azimuth that is highly sensitive to the incident angle (generally, incident from a direction perpendicular to the light-receiving surface). Since the azimuth detection sensitivity is different depending on whether the incident is incident from a certain direction or the other direction, the direction cannot be detected accurately.

[Object of the Invention] An object of the present invention is to provide a device that accurately detects the incident direction and intensity of solar radiation and performs optimal solar radiation correction control.

[Summary of the invention]

The present invention is based on the following principle.

Let I be the intensity of the light from the point light source 1, and let D be the incident direction of the light from the point light source 1. From the straightness of light, D is black light L! l! 1
represents the direction of

The output V of the light intensity sensor 2 whose sensitivity is constant and does not change with respect to changes in D, and whose output is proportional to the light intensity factor! can be expressed by the following formula.

V1=aI (a is a constant) ・・・・・・・・・U
) The output VD of the azimuth sensor 3 whose sensitivity changes with respect to a change in D and whose output is proportional to f can be expressed by the following equation.

Vo = bI・f(D) (b is a constant) −・−・・−
(2) From equations (1) and (2), the following equation can be derived.

If the inverse function of the function f is f-1, the following equation can be derived from equation (3).

In other words, the light intensity sensor 2 has constant sensitivity with respect to changes in D.
If we also install an azimuth sensor 3 whose sensitivity changes with a function f with respect to changes in D, and if f-1 is a monovalent function and its contents are known, we can calculate the outputs Vn, Vx, and constant C of each sensor. From the value of Equation (4), it is a block diagram of a solar radiation correction device of a point device.

In addition, the sensitivity characteristics of No. 4.5 and 8.9 [' are expressed using isosensitivity lines, and the numerical values of each line are based on the maximum sensitivity of 1.0.
It is expressed as a sensitivity ratio when

Embodiment 1 is a device that senses light incident in all directions by dividing it into two angular components α and β. Its structure, as shown in FIG. 1, is a structure in which a light intensity sensor 2 and two orientation sensors 3a and 3b are arranged side by side.

When the KXYZ axes are determined as shown in Fig. 1, α is the angle between the two axes and the incident light projection line, which is the incident light projected onto the Xz plane as shown in Fig. 2, and the sign of Add.

Similarly, β is the angle formed by the nine-person incident light projection line with the two axes when the incident light is projected onto the YZ plane as shown in FIG. 3, and is given the symbol .

Light intensity sensor? 2 uses a sensor whose sensitivity does not change with respect to changes in the light incident directions α and β, and whose output vIl is proportional to the light intensity of the point light source 1. Its characteristics can be expressed by the following formula.

V'+t=aI (a is a constant) -----Old-
Information) As shown in FIG. 4, the orientation sensor 3a changes its sensitivity with respect to changes in α, does not change its sensitivity with respect to changes in β, and is sensitive to black light [
A sensor whose output VDa is proportional to the light intensity value of 1 is used. Its characteristics can be expressed by the following formula.

Vo, = b(α+90)I (1) is a constant) −(
6) As shown in FIG. 5, the orientation sensor 3b has a sensitivity that changes with respect to changes in β, a sensitivity that does not change with respect to changes in α, and an output VDb that is proportional to the light intensity of the point light source 1. Use sensors. Its characteristics can be expressed by the following formula.

VDb=C(β+90)I (c is a constant) −(7
) From equations (5), (6), and (7), the following equation can be derived.

■! Turtle I = - (a is a constant) ...... αO Tsumaji, Vna at meters 5a, 6b, and 6C in Figure 1,
Vt1. Vobt measurement, soo value t set (7),
(8).

(9), α, β, It−
Desired.

Embodiment 2 is a device that senses light incident in all directions by dividing it into two angular components, θ. As shown in FIG. 6, its structure is such that a light intensity sensor 2 and two orientation sensors 3c and 3d are arranged side by side.

Let r be the angle that the incident light makes with the two axes when the XYZ axes are determined as shown in FIG.

0 is the angle formed by the incident light projection line, which is the incident light projected onto the XY plane, with the X axis, as shown in FIG.

The light intensity sensor 2 uses a sensor whose sensitivity does not change with respect to changes in the incident directions r and θ, and whose output vI2 is proportional to the light intensity (2) of the point light source 1. Its characteristics can be expressed by the following formula.

Vt2=d engineering (d is a constant) ・・・・・・・・・
As shown in FIG. 8, the αυ orientation sensor 3C changes its sensitivity with respect to changes in r, remains unchanged with respect to changes in θ, and black light [
A sensor whose output vo is proportional to the light intensity of 1 is used. Its characteristics can be expressed by the following formula.

Vo, = e (90 - r) I (e is a constant) - 0 e As shown in Fig. 9, the sensitivity of the direction sensor 3d changes with respect to changes in θ, but does not change with respect to changes in r. A sensor whose output V D d is proportional to the light intensity ■ of the black light #1 is used. Its characteristics can be expressed by the following formula.

Voa = f (360-θ)I (ll: constant fi
) -M formula αυ, a2. The following equation can be derived from (2).

In other words, Vo, Vt at meters 6d, 6e, and 6f in FIG.
x, Vo tai is measured, and the value is calculated using the formula α4. (to).

(to), r, θ, and I can be found.

In addition, as shown in Fig. 10, the light intensity sensor 2 and the direction sensor 3
The output is inputted to the microcomputer 8 through the A/D converter 7 for calculation, and a command based on the calculation result is issued to the actuator 9, thereby making it possible to perform solar radiation correction in consideration of the direction of solar incidence.

The light intensity sensor and direction sensor of the embodiment are constructed by installing a light-reducing plate 4 a little distance from the light-receiving surface of the photoelectric element 5, as shown in FIG. 11, and adjusting the transmittance distribution to a predetermined distribution. As shown in FIG. 12, the specific incident angle sensitivity characteristic E of the photoelectric element 5 is partially attenuated to a predetermined characteristic F.

〔Effect of the invention〕

According to the present invention, it is possible to accurately detect the direction of incidence in a wide range of directions of incidence, so that in an air conditioner for a vehicle equipped with a solar radiation correction device using the same, solar radiation correction can be performed taking into account the direction of solar radiation incidence, and as a result, The feeling when there is sunlight is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a point light source direction sensing device according to the present invention, FIG. 2 is a side view as seen from the direction A in FIG. 1, and FIG. 3 is a side view from FIG.
4 is a sensitivity characteristic diagram for the direction of incidence α and β of the direction sensor 3a, and FIG. 5 is the direction sensor 3b.
Fig. 6 is a perspective view of the point light source direction sensing device according to the present invention, Fig. 7 is a top view seen from the direction C of Fig. 4!6, and Fig. 8 is a direction sensor 3C. Fig. 9 is a sensitivity characteristic diagram for the incident directions r and θ of the direction sensor 3.
FIG. 10 is a block diagram, FIG. 11 is a perspective view of a solar radiation sensor using a dimming plate, and FIG. 12 is an incident angle sensitivity characteristic of the solar radiation sensor. DESCRIPTION OF SYMBOLS 1...Point light source, 2...Light intensity sensor, 3...Direction sensor, 4...Dimension plate, 5...Photoelectric element, 6...
Meter, 7...A-ri converter, 8...Microcomputer, 9...A rule 4-Figure β [Revised] 5 figure to 8 figure daily rate q Nihonfu 11 figure to 12 Figure ψ (revised e'i)

Claims (3)

[Claims] 1. In a device equipped with a solar radiation correction device that corrects and controls an air conditioning state according to the output of a solar radiation sensor, the solar radiation sensor is connected to a light intensity sensor whose sensitivity does not change with respect to a change in the direction of light incidence from a point light source; The solar radiation correction device comprises a direction sensor whose sensitivity changes according to a predetermined function with respect to a change in the direction of incidence, and the solar radiation correction device includes means for detecting the intensity and direction of light incident on the interior of the vehicle according to the output of the solar radiation sensor; 1. An air conditioner for an automobile with a solar radiation correction device, comprising means for correcting and controlling an air conditioning state according to the output of the means. 2. In the invention as set forth in claim 1, a light transmitting surface is formed on the light receiving surface of the photoelectric element so that the inherent incident angle sensitivity characteristic of the photoelectric element becomes the incident angle sensitivity characteristic for the light intensity sensor and the orientation sensor. An air conditioner for an automobile with a solar radiation correction device, characterized in that a light intensity sensor and a direction sensor are provided with a light attenuating plate having a predetermined rate distribution. 3. In the invention described in claims 1 and 2,
Values obtained by dividing the light incident direction into angular components (α, β) and light intensity I
The output V_1 of the light intensity sensor is set to be V_1=aI (a is a constant) for the value of
_D_2 is set such that V_D_1=I・f_1(α) V_D_2=I・f2(β), and the above-mentioned V_1, V_D_1, V_D_2
▲There are mathematical formulas, chemical formulas, tables, etc.▼ From the values of , automotive air conditioner with solar radiation correction device.