JPH0314739A - Headlight controller for car - Google Patents

Abstract

PURPOSE:To change over the intensity of the projecting light automatically and multi-steppedly by using data on the car running speed and the surrounding lightness, and controlling the lighting level of a headlight through fuzzy presumption in conformity to the specified fuzzy rule. CONSTITUTION:A car speed sensor 2 senses the running speed of a car. A lightness sensor 4 mounted for ex. at the wind shield of the car senses the lightness around the car, in particular ahead the car. A data output means 6 processes the outputs of these sensors 2, 4, and the results are emitted as the data of car speed and lightness. These pieces of data are entered by a fuzzy controller 8, and using them the lighting level of the headlight 10 is fuzzy infered. Then the level is controlled according to the results from inference. Thus the intensity of the light projected from the headlight 10 is changed over multi-steppedly, automatically, and appropriately.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a headlight control device that is installed in a vehicle such as an automobile and controls the lighting level of a headlight.

(Prior Art) Conventional headlight control devices for vehicles, such as automobiles, when driving at night generally involve manually operating a headlight control unit located within the seat in accordance with the vehicle's driving speed and surrounding conditions. The light emitted from the headlights can be switched between two levels: strong and weak.

(Problems to be Solved by the Invention) This headlight control device requires manual operation to switch the light emitted from the headlights, which is troublesome.

In addition, since the synchrotron radiation is simply switched between two levels of intensity and weakness, it may not be possible to obtain an appropriate intensity of synchrotron radiation according to the actual driving speed and surrounding conditions. It is often too strong or too weak, and therefore a simple two-stage switching system is insufficient for safe driving.

The present invention has been made in view of the above-mentioned problems, and by performing fuzzy control on the intensity of the emitted light from the headlights, the intensity of the emitted light from the headlights can be automatically switched, thereby improving operational efficiency. The aim is to eliminate the trouble of driving by adjusting the intensity of the headlight radiation to an appropriate level according to the speed of the vehicle and the brightness of the surrounding area, thereby enabling even safer driving. There is.

(Means for Achieving the Problem) In order to achieve such an object, the vehicle headlight control device of the present invention includes a means provided in the vehicle for detecting the running speed and surrounding brightness, and a means for detecting the running speed and the surrounding brightness. data output means for outputting data relating to traveling speed and brightness based on the output of the means, and using the data to perform fuzzy inference on the lighting level of the headlights of the vehicle according to fuzzy rules, and according to the inference, the lighting level of the headlights It features a fuzzy controller that controls the

(Function) The data output means outputs data regarding the traveling speed and surrounding brightness based on the detection output of the detection means. The fuzzy controller uses this data to fuzzy infer the lighting level of the headlights of the vehicle according to fuzzy rules, and controls the lighting level of the headlights based on the inference.

In other words, even if you are driving on a road with no street lights and the road ahead is pitch black, if your driving speed is low, then
There is no need to increase the intensity of the light, but if the vehicle is traveling at high speeds, it may be necessary to increase the intensity of the headlight radiation. In that case, the fuzzy controller determines the lighting level of the headlights commensurate with safe driving, based on the vehicle's traveling speed and surrounding brightness, and the brightness in front of the vehicle. In other words, it becomes possible to perform fuzzy inference on the radiation intensity.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a vehicle headlight control device according to an embodiment of the present invention, and FIG. 2 is a block circuit diagram of the Fanoy controller shown in FIG.

Referring to FIG. 1, reference numeral 2 denotes a known vehicle speed sensor that detects the running speed S1 of a vehicle (not shown), and 4 is installed on the windshield of the vehicle to detect the brightness S2 around the vehicle 2, particularly in front. This is a known brightness sensor that detects brightness. Both sensors 2 and 4 constitute the detection means referred to in the above-mentioned claims.

6 is data output means for processing the detection outputs St and S2 from both sensors 2.4 and outputting them as vehicle speed data X1 and brightness data X2, respectively; 8 is data output means for both data XI and X2;
Vehicle headlight l according to fuzzy rules using
This is a fuzzy controller that fuzzy infers the lighting level of the headlight 10 and controls the lighting level of the headlight 10 according to the inference.

As shown in FIG. 2, the fuzzy controller 8 includes an input section 12, a fuzzy inference section 14, a fuzzy rule storage section 16, and an output section! It consists of 8.

The input section 12 is adapted to individually output both data XI and X2 to the fuzzy inference section 14 as antecedent variables XI and X2 for performing fuzzy inference. In the fuzzy rule memory 16, the antecedent part i' shown in FIG. It stores multiple types of fuzzy rules in different formats. In each fuzzy rule shown in FIG. 3, N L and NMPL in the column indicated by xi are the Fanoy label names of the antecedent variable XI regarding the traveling speed, and
N L , NM . . . , PL in the horizontal row indicated by 2 are fuzzy label names of the antecedent variable X2 regarding the ambient brightness. NL, NM, . . . PL written at the intersections of the vertical and horizontal columns are fuzzy label names of the consequent variable y regarding the lighting level of the headlight IO. That is, in this fuzzy rule, each of xl and x2 is a combination of 7 types of fuzzy label names, so there are 49 types of fuzzy rules in the end. The fuzzy inference unit 14 stores membership functions in the membership function coordinate system of each of the antecedent variables XI and X2, as shown in FIGS. 4(a) and 4(b). Figure 4(a) shows the antecedent variable XI, that is, the membership function for the vehicle's running speed, and Figure 4(b) shows the antecedent variable x2.
, that is, the membership functions for the brightness around the vehicle are respectively shown. Also, vl, v2..., and 12 attached to the horizontal axis in FIGS.
1. &2... indicate the running speed and brightness level, respectively.

The fuzzy inference unit l4 also stores a membership function in the membership function coordinate system of the consequent variable y1, that is, the lighting level of the headlight 10, as shown in FIG. Further, in FIG. 5, Ll, L2, . . . attached to the horizontal axis indicate the lighting level of the headlight 10. The fuzzy inference result y from the fuzzy inference unit l4 is output to the output unit l8.

Explain the operation.

Detection output Sl from vehicle speed sensor 2 and brightness sensor 4
, S2 are applied to the data output means 6.

Data output 1,000 stages 6 is data Xi,
2 is given to the human power section l2 of the fuzzy controller 8.

The data Xi,
It is input to the fuzzy inference unit l4 as X2. and,
For each fuzzy rule in Fig. 3, the fuzzy inference 14 has a corresponding antecedent when the traveling speed is low, e.g. 10 km, and a corresponding antecedent with a variable Xl of, for example, NL, and a brightness or very bright antecedent. If the consequent variable Other fuzzy inferences are made in the same way. Based on this fuzzy inference result, the fuzzy controller PC fuzzy controls the lighting level of the headlight IO.

In addition, in this embodiment, since the level of the emitted light from the headlight 10 is controlled by Fanoi inference at an intensity appropriate to the surrounding situation, the headlight 10 is controlled by a single unit. :Rather than two stages as in the past, it is possible to appropriately control the vehicle in more stages to enable safe driving.

(Effect of the invention) As is clear from the above explanation, books! According to Akira, since the intensity of the emitted light from the headlights is fuzzy controlled, it is possible to automatically switch the intensity of the emitted light from the headlights, which eliminates the troublesome operation. At the same time, the intensity of the emitted light from the headlights is set to an appropriate level commensurate with the speed of the vehicle and the brightness of the surroundings, using multiple stages as necessary, instead of the traditional two-stage method. This enables even safer driving.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a vehicle headlight control device according to an embodiment of the present invention, Fig. 2 is a block circuit diagram of the fuzzy controller shown in Fig. 1, and Fig. 3 is a fuzzy rule memory stored in Fig. 2. FIGS. 4(a) and 4(b) are diagrams showing the membership functions for the antecedent variables, and FIG. 5 is a diagram showing the membership functions for the consequent variables. 2...Vehicle speed sensor, 4...Brightness sensor, 6...
Data output means, 8... Fuzzy controller, 10
···Headlight.

Claims (1)

[Claims] (1) A means provided on the vehicle to detect the running speed and surrounding brightness, a data output means that outputs data regarding the running speed and the brightness based on the output of the detection means, and a fuzzy rule using the data. 1. A headlight control device for a vehicle, comprising: a fuzzy controller that performs fuzzy inference on the lighting level of the headlights of the vehicle according to the inference, and controls the lighting level of the headlights according to the inference.