JPH0315820A - Polarization degree controller for liquid crystal glass - Google Patents

Abstract

PURPOSE:To enable the polarization degree controller to function effectively as a sunshade by inputting the temperatures inside and outside a room and the illuminance outside the room, finding the degree of polarization of liquid crystal glass by fuzzy inference system and adjusting the quantity of light transmission. CONSTITUTION:This controller is equipped with temperature sensors 1 and 3 which detect the temperatures inside and outside the room, an illuminance sensor 5 which detects the brightness outside the room, a fuzzy inference means 7 which inputs the detected values of the sensors and finds the degree of polarization of the liquid crystal glass by inference arithmetic, and control means 10 and 12 which control the degree of polarization of the liquid crystal glass. Then when the temperature and brightness outside the room are detected, the fuzzy inference means 7 performs the inference arithmetic by using the detected values according to a specific control rule to determine the degree of polarization of the liquid crystal glass, thereby adjusting the quantity of light transmission. Consequently, when this is used for the windshield of an automobile, this controller functions effectively as a sunshade for the inside of the automobile.

Description

[Detailed Description of the Invention] Industrial Application Fields The present invention relates to a liquid crystal glass polarization degree control device used to automatically control the polarization degree of liquid crystal glass installed in, for example, automobiles and house windows. ．． <Prior art> For example, transparent glass is generally used as window glass for automobiles to ensure driving safety. However, since transparent glass completely transmits light, drivers are dazzled, especially in the summer when the sun is strong, and this poses a problem for safe driving.

For this reason, a sun visor is placed at the top of the windshield so that it can rise and fall freely and rotate freely, and can be set as necessary to protect the driver's vision from direct sunlight. <Problems to be solved by the invention> However, since this sun visor needs to be manually set or removed each time, this kind of operation, especially while driving, is complicated and may lead to an accident. ．． In addition, this sun visor only has the function of protecting the driver's vision from direct sunlight, and has almost no function as a sunshade for the inside of the car. Therefore, if you leave your car in the hot sun during summer, the temperature inside the car will rise significantly, making you feel extremely uncomfortable when getting in the car. ,
The problem is that energy is wasted. To deal with this, simple awnings are installed on the inside of the windshield when parking, but this type of awning is unnecessary except in summer and is troublesome to maintain. It has also been proposed to use tinted glass for windshields and side windows, but this type of tinted glass poses a safety hazard when driving at night, and is rarely needed outside of the summer. There is a problem.

This invention was made by focusing on the above-mentioned problem, and when liquid crystal glass is placed around a room such as an automobile, the degree of polarization of the liquid crystal glass is fuzzy determined by inputting the temperature inside and outside the room and the illuminance outside. The purpose of this study is to provide a novel polarization degree control device for liquid crystal glass that can effectively function as a sunshade by introducing an inference method. <Means for Solving the Problems> The present invention uses an external temperature sensor for detecting the temperature outside the room and an external temperature sensor for detecting the temperature inside the room to control the degree of polarization of liquid crystal glass arranged around the room. The degree of polarization of the liquid crystal glass is determined by inputting an internal temperature sensor to detect the brightness of the room, an illuminance sensor to detect the outdoor brightness, and inputting the detected values from each sensor and performing quasi-theoretical calculations according to predetermined control rules. The apparatus includes a fuzzy inference means and a control means for controlling the degree of polarization of the liquid crystal glass based on the inference result by the fuzzy inference means.

When the indoor and outdoor temperatures and outdoor brightness are detected, the fuzzy inference means uses each detected value to perform inference calculations according to predetermined control rules, thereby determining the degree of polarization of the liquid crystal glass. Adjust the amount of light transmitted. Therefore, when this invention is applied to the window glass of a car, in addition to its function as a conventional sun visor, it also functions effectively as a sunshade for the inside of the car. Therefore, it is possible to prevent the temperature inside the pheasant from rising significantly in the summer without using a separate sunshade, and it also enables safe driving at night. Embodiment FIG. 1 shows a polarization degree control device for liquid crystal glass according to an embodiment of the present invention. The illustrated example is for controlling the degree of polarization of liquid crystal glass used as a window glass for a car, but the present invention is not limited to this, and can also be applied to a liquid crystal glass used for a window glass of a house. It can also be applied. In the case of this embodiment, as shown in FIG.
5 and all of the rear glass 16 with a liquid crystal glass (in the figure,
The liquid crystal glass is divided into a windshield l4 and other glasses 15 and 16, and the degree of polarization of the liquid crystal glass is automatically controlled in a series according to the temperature inside and outside the car and the illuminance outside the car. There is. Figure 3 shows the structure of the liquid crystal glass used in this invention. This liquid crystal glass 20 has a polarizing filter 1 in the center.
Transparent glass plates 18 and 19 are placed on both sides of the polarizing filter 17, and the degree of polarization of the polarizing filter 17 changes depending on the magnitude of the applied voltage. Returning to FIG. 1, the liquid crystal glass polarization degree control device according to this embodiment includes an external temperature sensor 1, an internal temperature sensor 3,
Illuminance sensor 5. Sample and hold circuits 2, 4, 6, fuzzy inference section 7. Rule storage section 8. It includes an amplifier 9.11, a windshield polarization degree control unit 1O, and a side/rear glass polarization degree control unit 12 as its components. External temperature sensor 1 detects the temperature outside the vehicle, internal temperature sensor 3 detects the temperature inside the vehicle, and illuminance sensor 5 detects the illuminance (brightness) outside the vehicle. Each of these sensors 1 and 3
．． 5 may be placed at appropriate locations on the front and rear surfaces of the windshield l4, for example. Each sensor 1. , 3.5 are the electrical signals Sl, S
! ．． Each sample-and-hold circuit 2, 4.6 samples and holds these electrical signals and inputs the hold value to the sample-and-hold circuit 2.4.6.
It is given to the fuzzy inference section 7 as l+X2+X. The fuzzy inference section 7 is a computing entity for executing fuzzy inference, that is, a fuzzy computer, a fuzzy controller, etc., and takes in inputs X-Xt+Xi regarding the temperature inside and outside the vehicle and the illuminance outside the vehicle, and stores them in the rule storage section 8. Fuzzy inference is performed according to multiple fuzzy rules, and as a result of the inference, an output y+. )'z' (determined value) is applied to each polarization degree control unit 10.12 of the windshield and side/rear glass via an amplifier 9.11. And each polarization degree control unit 10
．． 12 is a windshield 14. based on the inference result by the fuzzy inference section 7. Side glass 15, rear glass 16
The amount of light transmitted is adjusted by controlling each degree of polarization using voltage. The fuzzy rule is called an if, then (if, then) rule, and in this embodiment, the following fuzzy rules indicated by ( ]) to OD are stored in the rule storage unit 8.
It is stored in . (1) If X r = PLt X z −P
L+ X 2 “PLIthen 7r” PL,
7z = PL (2) if XI = PL,
xz −PM, x= −gpt,, then
F+ = PL, ! z = PM (3)th X-+ =
P.M. Xs = PM, X3 ””PM, then
)'l -PM, )'2 -PS(4) if
Xr = PM, Xs = PM, X3 = P
S, then y+ -PS, 3Fl -ZR(
5) if Xr = PM + Xs = PM,
Xi = ZR, then y. =ZR, y.
=ZR(6) quantity f x, =NS, x. =N
S, x, =PS, then 7+ -PS,
y. xZR(7) if X+ =NS.
Xs-NS. X3=PL. then 7l
=PM, lx =PM(8) if x,
=NMI X. =NMI K. “P.S.
then)l+=PS, 7t=ZR
(9) if XI mNM, g s=N
Ml x= =PLlthen y+ =P
M, 7* = PSGO) if X,
=NSl x, =PMl x, =PL,t
hen y+ =PM, 'fz =PM(I
f) if X l””NJ X t = PM
+Xs=PL+then y+=PM
, )'t = PM where ZR, PM, N? I
etc. are fuzzy labels, and generally ZR is "zero J", PS is "positive and small", PM is "positive and medium J", PL is "positive and large J", and NS is "negative and small". J and NM represent "negative and medium J," and NL represents "negative and large," respectively. Here, for the input Xl + Xl related to the temperature inside and outside the car, O('C) is ZH, 10 (''C) .20
(”C) . 30 ['C) PS, PM. PL
, −to(”C),=20 (”C), −30
('C) corresponds to NS, NM, and NL, respectively. Regarding input x3 related to illuminance, ZR is a completely dark state with zero illuminance, and “a little bright”, “very bright”, “
PS, PM. Each corresponds to PL. Furthermore, regarding the output yVt related to the degree of polarization of the liquid crystal glass, the state where the degree of polarization is zero (the state where transmitted light is not restricted) is ZH, and the degree of polarization is 30C%],
60 [%). 90 (%) PS. PM, PL
, respectively. These linguistic expressions are expressed by membership functions, and the membership function for human power x1 related to the temperature outside the car is shown in Figure 4 (1), and the membership function for human power x3 related to the temperature inside the car is shown in Figure 4 (2). Figure 4 (3) shows the membership function of the input X, related to the illuminance outside the vehicle, Figure 4 (4) shows the membership function of the output y, related to the polarization degree of the windshield, and the membership function of the input X, related to the illuminance outside the vehicle. The membership function of the output yt for is shown in Figure 4 (5)
are shown respectively. In each of these figures, the vertical axis for the Yokotsumugi variables represents the degree to which these variables belong to the fuzzy set expressed by the above-mentioned linguistic expression (membership value). Thus, in the fuzzy inference section 7, each sensor 1.3
．． Input X regarding internal and external temperature and illuminance given from 5
1 + X z r Then, the membership function of the outputs yi and yz related to the degree of polarization of the liquid crystal glass is restricted based on the selected degree of fitness, and a trapezoidal membership function, for example, is obtained. These membership functions are superimposed (MAX calculation), and then the center of gravity of this combined output is calculated as definite outputs y, y2' and output to each polarization degree control section 10.12 (defuzzify).

For example, when driving or parking a car during the day in summer, when the temperature inside and outside the car is 30°C and the illuminance outside the car is very bright, XI
=PL, X! =PL, x. =PL, the fuzzy rule (1) is activated in the fuzzy inference unit 7, and the output )'++3'z regarding each polarization degree of the windshield and side/rear glass is )'I =PL,
Fz-PL. As a result, the degree of polarization of both glasses is 90%, blocking light from the outside to the maximum extent possible, and functioning effectively as a sun visor and as a sunshade for the inside of the car. Next, when driving or parking a car at night in the same summer, the temperature inside and outside the car are both 20°C, but the illuminance outside the car is zero, then X+ = PM,
Xs - PM, Xs = ZR, and the fuzzy rule (5) is activated in the fuzzy inference section 7,
Output y1 regarding each degree of polarization of the windshield and side/rear glass. yt is! + “ZR, Fg
The degree of polarization of both glasses is 0%, and the function as a sun visor or sunshade is completely eliminated, allowing the maximum amount of light to enter the room, contributing to safe driving. Next, when driving or parking a car during the day in winter, if the temperature inside and outside the car is -10'C and the illuminance outside the car is very bright,
"MS, Xi = NS, =PM,
'It = PM.

As a result, the degree of polarization of both glasses is 60%, and light from the outside is appropriately blocked, realizing safe and comfortable driving. In this way, the degree of polarization of the liquid crystal glass will be finely and automatically controlled to the optimum state according to the temperature and illuminance inside and outside the vehicle. <Effects of the Invention> As described above, this invention manually calculates the indoor and outdoor temperature and outdoor illuminance, calculates the degree of polarization of the liquid crystal glass by fuzzy reasoning, and adjusts the amount of light transmitted. When glass is used in car windows, in addition to its traditional function as a sun visor, it also functions effectively as a sunshade for the interior of the car. This prevents the temperature inside the car from rising significantly during the summer without using a separate sunshade, and also contributes to safe driving at night. In addition, the control rules for fuzzy inference are expressed in expressions that are easy for humans to understand, making it easy to construct a control system, and the control rules that are activated change depending on the input conditions.
It has many remarkable effects, such as being able to implement precise IB control.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a polarization degree control device for liquid crystal glass according to an embodiment of the present invention, Fig. 2 is a perspective view showing the arrangement of liquid crystal glass in an automobile, and Fig. 3 shows the structure of liquid crystal glass. The cross-sectional view and Figure 4 are illustrative diagrams showing the membership functions of input and output. ■...External temperature sensor 3...Internal temperature sensor 5...Illuminance sensor 7...Fuzzy inference section 10, l2...Polarization degree control section

Claims (1)

[Claims] A polarization degree control device for controlling the degree of polarization of liquid crystal glass arranged around a room, comprising: an external temperature sensor for detecting the temperature outside the room; and an external temperature sensor for detecting the temperature inside the room. an internal temperature sensor for detecting outdoor brightness, an illuminance sensor for detecting outdoor brightness, and a fuzzy inference system that calculates the degree of polarization of the liquid crystal glass by inputting the detected values from each sensor and performing inference calculations according to predetermined control rules. A control device for controlling the degree of polarization of liquid crystal glass, comprising: means for controlling the degree of polarization of liquid crystal glass based on the inference result by the fuzzy inference means.