JPS6253255A - Auto light control device for car - Google Patents

Abstract

PURPOSE:To ensure the automatic lighting of head lamps for a car running through a tunnel equipped with illumination facilities at the daytime by raising a setting level for the intensity of illumination as compared with detected daylight below the setting level thereof, when daylight detected by the sensor thereof is over a predetermined level. CONSTITUTION:The output of an illumination sensor 1 for detecting the intensity of illumination outside of a car changes depending upon whether the sensor 1 is exposed to daytime or nighttime illumination, and when a car runs through a tunnel at the daytime or the nighttime. Also, an output from a daylight sensor 15 through an operation amplifier 16 changes according to whether the sensor 15 is exposed to daytime or nighttime illumination, and when a car runs through a tunnel at the daytime. In this case, a changeover device 17 for setting the intensity of illumination is operated so that a setting level for the intensity of illumination for a head lamp illumination comparative means 5 will be higher than detected illumination if this illumination is below the density of illumination as set, and a head lamp 8 is lit on according to the output of said device 5 via a timer circuit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention detects the illuminance outside the vehicle by detecting the brightness and darkness of the outside of the vehicle and automatically turning on the +1ii lights when the outside of the vehicle is bright or dark. , an illuminance comparing means that outputs a lighting signal when the detected illuminance of the illuminance sensor becomes lower than a set illuminance, and a headlamp that turns on in response to the lighting signal. This invention relates to an autolight control device.

(Summary of the Invention) The present invention provides an automatic light control device for an automobile that can effectively turn on the headlights when driving in a certain lighting tunnel during the daytime. This is how it was done.

(Prior art and its problems) In a conventional device of this type, the illuminance setting in the illuminance comparison means is set so that the headlights are turned on when it gets dark to a certain extent at dusk.

By the way, for safe driving, when driving in a tunnel, it is necessary to turn on the headlights at least four times, even if the tunnel is equipped with relatively bright lighting equipment.

However, in normal cases, the illuminance of the lighting equipment in the l-channel is 1. Therefore, the A1 is configured as a 3L system where the illuminance is higher during the day than at dusk or at night.

As a result, in the case of the conventional example using the 4L configuration described in 1-4, due to the high illuminance from the lighting equipment and the entry of outside light into the L-channel during the daytime,
When the illuminance of the lighting equipment inside the tunnel becomes higher than the set illuminance, a lighting signal is output from the illuminance comparison means 4'', and there is a drawback that the headlights cannot be turned on even if the user enters the tunnel. Every time you enter a tunnel, you have to switch the auto light control device from automatic to manual operation to turn on the headlights, which is a drawback that detracts from the original benefits of automatic lighting. Ta.

Therefore, it is conceivable to set the illuminance to a higher value in advance, but there is an inconvenience that when driving on a normal road 1, the headlights will turn on on the island if the mano 3 is bright at twilight.

(Objective of the Invention) The present invention is based on the following points: Since it is relatively expensive, the purpose of the four-wheel drive is to ensure that the headlights can be turned on automatically.

(Configuration and Effects of the Invention) In order to achieve the above objects, the present invention detects the amount of solar radiation outside the vehicle using an automatic+lL auto-light controller installed in the stomach. When the amount of solar radiation detected by the radiation sensor and its 11th radiation sensor is higher than the set value of 11, the detected 11% radiation is higher than the set amount of solar radiation.
In this case, the setting illuminance can be changed to a height of 14 degrees.

According to this configuration, during the daytime, when the 11-shot sensor detects 1) discussion or setting [1 shot, Furthermore, even if the illuminance of the lighting equipment is relatively high, the illuminance does not exceed the set illuminance, and the illuminance comparison means outputs a lighting signal to automatically turn on the headlights.

At dusk, the amount of solar radiation detected by the radiation sensor is lower than the amount of solar radiation set], so the set illuminance is switched to a low state. When the illuminance inside the tunnel is lower than the set illuminance, the illuminance comparison means outputs a lighting signal to automatically turn on the headlights.

At night, the amount of solar radiation detected by the 11 radiation sensor is lower than the set amount of solar radiation, so the set illuminance is switched to a low state. The headlights were already on before entering the tunnel, and the illuminance of the lighting equipment inside the tunnel at night was lower than the illuminance during the day, so the illuminance inside the tunnel was lower than the set illuminance when it was low. The vehicle is also low enough to drive through tunnels without having to turn off the headlights.

Therefore, when driving in a tunnel, even if the lighting equipment installed there is of high illuminance, the headlights are automatically turned on during the day, at dusk, and at night. It lights up well, and every time a person enters the channel,
It is now possible to drive safely without incurring poor operability, such as turning on the headlights with the % operation.

(Description of Embodiments) The present invention will be described in detail below with reference to embodiments shown in the drawings. FIG. 1 is a circuit diagram of an auto light control device for an automobile according to an embodiment of the present invention. In this figure, l is an illuminance sensor that detects the illuminance outside the vehicle,
It is composed of a photodiode 2 and an operational amplifier 3.

4 is a tail light (small lamp) illuminance comparison means for outputting a lighting signal when the illuminance detected by the illuminance sensor 1 is lower than the set illuminance; 5 is the illuminance sensor l;
A headlight illuminance comparison means outputs a lighting signal when the detected illuminance becomes lower than the set illuminance, and 6 is a threshold voltage of each of the taillight illuminance comparison means 4 and the headlight illuminance comparison means 5. A stabilizing electric pole circuit is used to keep the level constant, 7 is a taillight, and 8 is a headlight.

9.1 (1 is a timer circuit for the taillight and headlight, respectively, and the lighting (10) from the taillight illuminance comparison means 4 and the headlight illuminance comparison means 5 is in the output state. The tail light 7 will switch to the output stop 14 state from
In order to maintain the lighting state of the headlights 8, the taillights 7 and headlights 8 are turned off even if the illuminance detected by the illuminance sensor 1 temporarily exceeds the set illuminance. It's designed to never happen.

+1. +2 is a switch for a switch that conducts in response to a lighting signal for the taillight and for the headlight, closes each of the relay circuits 13 and 14, and lights each of the taillight 7 and the headlight 8. .

15 is a solar radiation sensor that detects the amount of solar radiation outside the vehicle;
)-4 Togui Auto.

16 is the [detected by the single shot sensor 15]
It is an operational amplifier that outputs a voltage corresponding to the amount of radiation, and the voltage output is output to the air conditioner controller (J-RA (shown in the figure)), so that it functions as a sensor for controlling the operation of the air conditioner.

・ 17 is the illuminance comparison for the headlamp compared to the case where the solar radiation level is higher than the case where the solar radiation level is higher than the one detected by the solar radiation sensor 15. The set illuminance switching means sets the set illuminance of the means 5 to high <-4', and is composed of a comparator 18, a capacitor 0 that integrates the comparison output from the comparator 18, and a transistor 19 that becomes conductive by the comparison output. and l・
A collector of the lannostar 19 is connected to a reference voltage input terminal of a comparator 5a of the headlamp illuminance comparing means 5. As a result, when the voltage output from the operational amplifier 16 is high and the detected amount of stone is higher than the set amount of solar radiation, the transistor 19 is not made conductive, and the reference voltage of the comparator 5a is increased to When the set illuminance is high and the voltage output from the operational amplifier 16 is low (and the detected solar radiation is lower than the setting 11), the transistor 19 is made conductive, and the reference voltage of the comparator 5a is lowered to compare the headlamp illuminance. 5. When the detected solar radiation amount or the setting El solar radiation amount is high, the illuminance setting is lower than the illuminance outside the vehicle during the day, and is lower than the illuminance of the lighting equipment inside the tunnel during the day. The illuminance is set to be higher than both the illuminance and the illuminance outside the car when the roof is thinly covered, and when the detected solar radiation is lower than the set solar radiation, the illuminance is lower than the illuminance outside the car when the roof is thinly covered, and The illuminance is set higher than the illuminance inside the tunnel.

Comparator 4a of the tail light illuminance comparison means 4
A hysteresis resistor R, , R, is connected to each of the comparators 5a of the headlamp illuminance comparison means 5, and after a comparison output of "11" level is output from each, the comparators 4a, 5a are The reference voltage of the voltage input terminal is increased, and the voltage that stops outputting the lighting signal is set higher than the voltage that outputs the lighting signal, and once each of the taillight 7 and headlight 8 is lit, the illuminance sensor l detects the The light is not turned off unless the illuminance becomes higher than the detected illuminance at the start of lighting by a predetermined value or more.

20 is a battery power source, and 21 is an ignition switch. Reference numeral 13 denotes a light switch section, and by switching the light switch section, the tail light 7 and the headlight 8 can be switched between artificially turning on and off, and automatically turning on and off. There is.

A is an auto light control circuit. The auto-write control circuit A may be constructed using a microcomputer equipped with an A/D conversion circuit instead of being constructed from an analog circuit as described in 1-1.

As shown in FIG. 2, the illuminance sensor I and the solar radiation sensor 15 are provided on a dash board 23'' provided in front of the handle 22 so as to be divided into left and right sides. In addition, the dash board 23 is equipped with a tachometer 24.
Instruments such as a speedometer 25, and devices such as a car radio 26 and a car air conditioner 27 are provided.

Next, the operation of this embodiment will be explained using the time chart of FIG.

The output (a) from the illuminance sensor 1 changes from daytime to nighttime through dusk and changes as the tunnel passes a and b during the daytime and nighttime, respectively.

In addition, the output (B) from the radiation sensor 15 through the operational amplifier 16 also changes from daytime to nighttime through dusk, and also changes as the person passes through a tunnel during the daytime. Along with this, the comparator 18 outputs a comparison output (Δ, :I) while integrating it with the reference voltage (Slenjord voltage level) Vt.
)X) out ゛4'.

This comparison output (c) and the operating voltage V of the transistor 19
d, a conduction output (d) is output from the transistor 19, and corresponding to the non-conduction and conduction of the transistor 19, the base voltage (e) of the comparator 5a is changed to a high ON voltage VOn+ and a low □N voltage. In addition to switching to Vont, due to the above-mentioned hysterinous characteristic, a correspondingly high OF
FF11! Pressure Vofft.

As a result, when passing through a tunnel in the daytime, the set illuminance of the headlamp illuminance comparison means 5 is ': the reference voltage IT (e) of the J-barrector 5a or the high ON voltage Von, i),
Accompanied by intrusion into the tunnel, te, 1j ((degree sessa 1
Output from (A) or high ON voltage IN V on, below 1
: At that point, output a signal to turn on the headlights 8 from stage 5 of 11 illuminance comparison 4' to 3. After that, the reference voltage of the comparator 5a is switched as the output (c) from the I comparator 18 rises to the operating voltage Vd of the transistor 19,
．． It's low -) de Iro (Voff,) is ko') O
The voltage level is higher than that output by F F m I ofr2 (depending on the illuminance of the lighting equipment in the tunnel), and maintains the front light 8 in a lit state. After that, head from inside the channel to output 11 and check whether the output from the illuminance sensor (A) or the low 0 F? [When the pressure becomes higher than Vorf+, the output of the lighting signal is stopped.1. , automatically stops headlights 8 [
4 Ru.

At the time of thin recruitment, [the output from the single-shot sensor 15 is lower than the reference voltage of the comparator 18, =1 the reference voltage of the comparator 5a is lower than the ON voltage IEVon, , OF F 'F [I
A lighting signal is output to the headlamp 8 until the output from the illuminance sensor 1 (A) reaches 0N111 pressure VOnt, which is low in daytime illuminance of lighting equipment in the tunnel. Light 8 does not light up.

At night, both when driving on the road and when passing through a tunnel, the output from the illuminance sensor corresponds to not only the illuminance outside the city but also the illuminance from the lighting equipment inside the tunnel (
b) Low ON voltage Vont and OFF voltage Vorr
, 4'', and from the point in time when the output (a) from the illuminance sensor I becomes lower than the ON voltage VOnt, a lighting signal (i) is output, and the headlamp 8 is turned on.

- In the embodiment described in ], as the one-shot sensor 15, air =]
Although the solar radiation sensor 15 also serves as a sensor for controlling the operation of the engine, a dedicated solar radiation sensor 15 may also be used. Further, the solar radiation sensor 15 is not limited to a photodiode, and a thermistor may be used.

The illuminance sensor 1 and the single-ray sensor 15 may not only be installed separately, but also both sensors 1.15.
It is also possible to have both of them integrated into the same package.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an automatic auto light control device according to an embodiment of the present invention, FIG. 2 is a front view of the Dunno Coordinator showing the installation states of the illuminance sensor and the one-shot sensor, and FIG. Thailand is 12 diyat. l ・Illuminance sensor, 5 Illuminance comparison stage, 8 ・Headlight,
15 solar radiation sensor, 17 setting illuminance switching means.

Claims (2)

[Claims] (1) An illuminance sensor that detects illuminance outside the vehicle; an illuminance comparison means that outputs a lighting signal when the illuminance detected by the illuminance sensor becomes lower than a set illuminance; and a headlight that turns on in response to the lighting signal. An automatic light control device for an automobile, comprising: a solar radiation sensor that detects solar radiation outside the vehicle; and a solar radiation sensor that sets a detected solar radiation amount when the detected solar radiation amount of the solar radiation sensor becomes higher than a set solar radiation amount. An auto light control device for an automobile, comprising a set illuminance switching means for setting the set illuminance higher than when the amount of solar radiation is below. (2) The auto light control device for an automobile according to claim 1, wherein the solar radiation sensor is a sensor for controlling the operation of an air conditioner.