JPH09136569A - Automatic light control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the user of an automatic light control device which automatically turns on the small light and head light of a car according to ambient brightness to easily adjust illumination settings for turning on and off the lights. SOLUTION: A comparator circuit 11 in an automatic light control device which compares a value detected by an illumination sensor 2 with a reference value and controls the blinking of a small light Ls and a head light Lh according to the comparison result is provided with a memory circuit; when a lighting switch 1 for controlling the turning-on and -off of the small light Ls and the head light Lh is operated, the reference value is changed as predetermined according to this operation, and the turning-on and -off of the small light Ls and the head light Lh are controlled according to the changed reference value so as to allow the user to easily adjust illuminance settings for turning on and off the lights.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic light control device for automatically controlling turning on and off of a small light including a side light, a tail light and a number light of an automobile and a headlight according to ambient brightness. Regarding

[0002]

2. Description of the Related Art There is an automatic light control device as a device for automatically controlling the turning on and off of a headlight and a small light including a side light, a tail light and a number light of an automobile according to the brightness of the surroundings.

As shown in FIG. 11, for example, the automatic light control device includes a lighting switch 1, an illuminance sensor 2,
Control means 3 and light relays 4a and 4b for driving lights
The control means 3 is connected to an ignition switch 5 and a driver's door switch 6.

The lighting switch 1 includes a small light switch position s for turning on and off a small light Ls consisting of a side light, a tail light and a number light, and a headlight switch position h for turning on and off the headlight Lh. It consists of an auto switch position a and an off position o for setting the small lights Ls and headlights Lh so that they can be turned on and off automatically. In addition to the normal light ON / OFF, AUT
It has a position called O.

In many cases, the illuminance sensor 2 uses a photodiode 7 as a detection element, and the diode is housed in a case 8 as shown in FIG. Is detected. Further, as shown in FIG. 12, an optical filter 9 and a sensitivity adjusting ring 10 are attached to the case 8 accommodating the photodiode 7, and the ring 10
Adjust the amount of light incident on the photo diode 7,
The detection sensitivity is adjusted.

The control means 3 is composed of a comparator circuit 11 and an automatic extinguishing circuit 12.

The comparator circuit 11 comprises a comparator circuit 11a for twilight detection and a comparator circuit 11b for nighttime detection.
1b is connected to the illuminance detection sensor 2.

Further, each comparator circuit 11a, 11b
Of the switching transistor Tr.
The collector terminals of the switching transistors Tr1 and Tr2, which are connected to the bases of 1 and Tr2 and are connected to the comparator circuits 11a and 11b, are connected to the light relay 4, respectively. The emitter terminals of the switching transistors Tr1 and Tr2 are grounded via the auto switch position a of the lighting switch 1. When the lighting switch 1 is set to the auto switch position a, the switching transistors Tr1 and Tr2 are grounded. It will be in the operating state,
The light relays 4a and 4b are driven.

That is, the surroundings become dark and the illuminance sensor 2
Output falls below a reference value preset in the comparator circuit 11a for detecting dusk, the comparator circuit 11a for detecting dusk detects the light relay 4a for driving the small light.
Is activated to turn on the small light Ls. Furthermore, when the surroundings become dark and the output of the illuminance sensor 2 falls below the reference value set in the night-time detection comparator circuit 11b, the night-time detection comparator circuit 11b activates the headlight driving light relay 4b. To turn on the headlight Lh. On the contrary, when the surroundings become bright and the detection output of the illuminance sensor 2 exceeds the reference value for lighting the small light Ls and the headlight Lh, each comparator circuit 11
a and 11b turn off the lights by stopping the operation of the light relays 4a and 4b, respectively.

On the other hand, the automatic extinguishing circuit 12 is a logic circuit using, for example, an RS flip-flop circuit 13 as shown in FIG. 11, and is driven to the RS input of the RS flip-flop circuit 13, respectively. The seat door switch 6 and the ignition switch 5 are connected. Also,
The Q output of the RS flip-flop circuit 13 is connected to the power supply switching transistor Tr3 that supplies electric power from the battery to the comparator circuit.
The power supply switching transistor Tr3 is turned on / off according to the truth table shown in FIG.

That is, when the door is closed and the ignition switch 5 is turned on, both the R and S inputs of the RS flip-flop circuit 13 become "H", so that ~ Q
The output becomes L, the power supply transistor Tr3 is turned on, power is supplied to the comparator circuit 11, and the lights can be automatically turned on.

When the vehicle is stopped and the ignition switch 5 is turned off, the RS flip-flop circuit 1
"L" is input to the S input of 3, but since the transistor Tr1 for driving the light relay is ON, R
"L" is input to the input, the ~ Q output of the RS flip-flop circuit 13 is held in the "L" state,
It is kept in the automatic lighting state. At this time, when the door is opened, “H” is input to the R input of the RS flip-flop circuit 13.
Is input, the ~ Q output of the RS flip-flop circuit 13 is inverted and becomes "H". Therefore, the power transistor Tr3 is turned off, the supply of power to the comparator circuit 11 is stopped, and the lighting of the light during parking is prevented.

By the way, in such a conventional auto light control device, the reference value of the illumination illuminance at dusk and at night is:
The values are set in advance to about 130 lux and 50 lux, respectively. To change the set value, the sensitivity adjustment ring 10 in the illuminance sensor 2 is adjusted or the reference voltage of the comparator circuit 11 of the control means. I was going to reset.

[0014]

However, in the above adjustment method, the sensitivity adjustment ring is adjusted by opening the case of the illuminance sensor of the dashboard and the circuit constant of the comparator circuit of the control means is set every adjustment. It must be done again, and ordinary users cannot easily make those adjustments.

Therefore, in order to carry out this adjustment, the vehicle must be brought to a dealer or a repair shop, which is very troublesome.

The lighting illuminance of the light varies depending on the brightness felt by individual users. For example, some users feel the lighting illuminance to be dark when the lighting illuminance set in advance is set. Has the problem that it is desirable for the user to be able to do it easily.

Therefore, an object of the present invention is to allow a user to easily adjust settings of illumination illuminance and illumination illuminance of small lights and headlights.

[0018]

In order to solve the above problems, in the invention according to claim 1 of the present invention, a small light including a side light, a tail light and a number light, and a headlight are turned on and off. A lighting switch having a small light switch position, a headlight position and an off position has an auto switch position for setting so that the small light and the headlight can be turned on and off automatically, and the auto switch The control means compares the detected value of the illuminance sensor with a preset reference value by operating the lighting switch to the position, and controls the turning on and off of the small light and headlight based on the comparison result. In the device, the control means is a lighting switch. Repeatedly applying a predetermined change to the reference value according to the switch operation, it was adopted a structure which is adapted to control the turning on and off the small light and headlight on the basis of a reference value change.

Further, at this time, in the invention according to claim 2, when the lighting switch is operated to the off position and the small light switch position while the lighting switch is lit at the auto switch position, the reference value is lowered, On the other hand, when the lighting switch is operated to the small light switch position and the headlight position while the light is turned off at the auto switch position, the above reference value is increased so that the above-mentioned control device responds to the above-mentioned reference according to the switch operation of the lighting switch. It adopted a configuration in which a given change was repeatedly added to the value.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, claim 1 and claim 2 of the present invention will be described.
Embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the automatic light control device of this embodiment includes a lighting switch 1, an illuminance sensor 2, a control means 3, and a light relay 4a for driving a light.
4b.

The lighting switch 1 is, for example, a rotary switch having four positions, a small light switch position s, a headlight switch position h, an auto switch position a and an off position o, as in the conventional example. As shown in, the lever of the lever switch for signal turn operation provided on the handle is built in, and by turning the knob provided at the tip of the lever, in order, OFF, small light, headlight, auto Each position can be selected.

The illuminance sensor 2 is the same as the one explained in the conventional example in which the photodiode 7 is set in the case 8 provided with the optical filter 9 and the sensitivity adjusting ring 10.
As shown in FIG. 3, the optical filter 9 is installed on the upper surface of the dashboard so as to be exposed, and the ambient brightness can be detected through the windshield.

In the case of this embodiment, the control means 3 is constructed by composing the comparator circuit 11 with a digital arithmetic unit.

The comparator circuit 11 comprises an input section 20, a central processing section 21, and an output section 22. For example, an I / O port for input / output, a memory circuit for processing, etc. are built in one chip. A one-chip microcomputer can be used.

The input section 20 comprises a switch input section 20a and a sensor input section 20b.
Is an input circuit having a switch interface means for preventing chattering, and the lighting switch 1
The switch output of 1 can be input to the central processing unit 21.

Further, the sensor input section 20b has an A-D conversion means, and the detection output inputted from the illuminance sensor 2 is converted into digital data by the A-D conversion means and inputted to the central processing section 21. To do.

The central processing unit 21 has a memory circuit, and a non-volatile control memory in which a control program is written in the memory and a register memory (for example, for twilight) for rewritably storing output data from the illuminance sensor 2. And a RAM memory for storing illuminance data for nighttime), and the control program written in the control memory compares the illuminance data stored in the register memory with the detected value of the illuminance sensor 2 as a reference value, and compares them. The output unit is driven based on the result.

At this time, the central processing unit 21 reads the state of the setting position of the lighting switch 1 from the switch input unit 20a by the control program, and rewrites the data in the register memory based on the read data. It is like this.

The output section 22 is a driver circuit composed of a buffer amplifier or the like, and has two outputs in this embodiment, and each output can output a drive current capable of directly driving the light relays 4a and 4b.

The light relays 4a and 4b are composed of a small light relay 4a and a headlight relay 4b, and the small light relay 4a is connected to a small light Ls composed of a side light, a tail light and a number light. On the other hand, the headlight relay 4b is connected to the headlight Lh and is driven independently by the output unit 22.

Further, in the case of this form, the automatic extinguishing circuit is
The comparator circuit 11 detects the output of the ignition switch 5 and the door switch 6 of the driver's seat, and the comparator circuit 11 controls turning off the light. The operation is the same as that described in the conventional example. The description will be omitted here.

This embodiment is configured as described above,
In this auto light control device, the illumination illuminance L1 of the comparator circuit 11 for lighting the small light Ls set in advance by the manufacturer and the illumination illuminance L2 of the comparator circuit 11 for lighting the headlight Lh at night are set.
The setting value of can be changed by the user according to the lighting state of the small lights Ls and the headlights Lh and the pattern for changing the lighting switch 1 to each switch position. The operation of the comparator circuit 11 will be mainly described based on the flowcharts of FIGS.

That is, in this auto light control device, the central processing unit 21 is activated by the control program,
As shown in FIG. 4, the writing switch 1 is read and each process is executed (“process 100” and subsequent processes are omitted).

At this time, if the lighting switch 1 is set to the auto switch position a (15
0), auto write processing is executed (200).

In the auto light process (200), as shown in FIG. 5, the current ambient illuminance detected by the illuminance sensor 2 is compared with the illuminance L1 at dusk stored in the central processing unit 21 (201), When the illuminance of the surroundings is darker than the illumination illuminance L1 at dusk, the small light relay 4a is turned on to turn on the small light Ls (202), and the lighting flag i of the small light Ls by the auto light process is set to that effect. It is stored (203). At this time, when the surrounding illuminance is brighter than the lighting illuminance L1 at dusk (201), the small light relay 4a is turned off and the small light L is turned on.
s is turned off (204), and the lighting flag i of the small light Ls is lowered (205). After performing the processing of the illumination illuminance L1 at dusk, the current ambient illuminance and the illumination illuminance L2 at night are compared (206). If the ambient illuminance is darker than the illumination illuminance L2 at dusk, the head The light relay 4b is turned on to turn on the headlight Lh (207), and the lighting flag j of the headlight Lh by the auto light process is set and stored to that effect (208). At this time, if the ambient illuminance is brighter than the nighttime illumination illuminance L2 (20
6), turn off the headlight relay 4b (21
0), the lighting flag j of the headlight Lh by the auto light process is lowered, and the process returns to the main routine (20).
9).

As described above, in this process (200), automatic lighting is performed based on the set lighting illuminance L1 at dusk and lighting illuminance L2 at night, and whether the lighting state is the auto switch position a depending on the flags i and j. Whether or not it is stored is stored, the process returns to the main routine and the above process is repeated (300).

On the other hand, as shown in FIG. 4, when the lighting switch 1 is not set to the auto switch position a when the lighting switch 1 is read (150), the lighting flag i of the small light Ls and the headlight. The lighting flag j of Lh is read and it is checked whether or not the lighting state is due to the auto switch position a.

At this time, if it is not the lighting state by the auto switch position a, the manual process is executed (6
50) If it is the lighting state by the auto switch position a, the lighting switch 1 is read again and it is checked whether the switch position is set to the headlight switch position h (400). And
If the lighting switch 1 is in the headlight switch position h, head position processing (450)
If the lighting switch 1 is not in the headlight switch position h, check whether the lighting switch 1 is set in the small light switch position s (5
00), if it is set, small position processing is executed (550). If the lighting switch 1 is not set to the small light switch position s, the off-position processing is executed (6
00).

In the head position processing (450), as shown in FIG. 6, the small light relay 4a and the headlight relay 4b are turned on, and the small light L is turned on.
s and headlight Lh are turned on (451, 45
2) Then, the lighting flag j of the headlight Lh is read again to detect whether or not the headlight Lh is lit at the auto switch position a (453). And
When the flag j is set, the headlight Lh was lit at the time of the auto switch position a. Therefore, this lighting switch 1 position change is not a setting change, and the lighting flag i of the small light Ls and the headlight Lh are not changed. The lighting flag j is lowered (454), and the process directly returns to the main routine (455).

On the other hand, when the flag j is not set (453), the headlight Lh is lit, and this change of the position of the lighting switch 1 is for setting change. Therefore, the small light Ls is set. The lighting flag i is read (456), and when this flag i is set, the reference illuminance of the night lighting illuminance L2 is increased by 10 lux and the value is saved (457), and the lighting flag of the small light Ls is lit. i and the lighting flag j of the headlight Lh are lowered (454) to return to the main routine (455). Also, the lighting flag i of the small light Ls
If the value is low, increase the reference value of nighttime illumination illuminance L2 and twilight illumination illuminance L1 by 10 lux each, and save the values (458, 459).
The lighting flag i of s and the lighting flag j of the headlight Lh are lowered (454), and the process returns to the main routine (45).
5). Therefore, the lighting process at the auto switch position a from the next time is performed with the newly set nighttime lighting illuminance L2 and dusk lighting illuminance L1.

Further, the small position processing (55
0), as shown in FIG. 7, the small light relay 4
After turning on a, turning off the headlight relay 4b to turn on the small light Ls (551) and turning off the headlight Lh (552), the lighting flag j of the headlight Lh is read (553), and the flag j is read. Is standing, the reference illuminance of the nighttime illumination illuminance L1 is reduced by 10 lux, the value is saved (554), and the illumination flags i and j of the small light Ls and the headlight Lh are lowered (555), Return to the main routine (55
6). Further, in the process (553), the lighting flag j of the headlight Lh is read, and when the flag j is lowered (553), the lighting flag i of the small light Ls is read (557), and this flag i is set. If
The lighting flags i and j of the small lights Ls and the headlights Lh are lowered (555), and the process returns to the main routine (556). At this time, if the lighting flag i of the small light Ls is lowered (557), the reference value of the lighting illuminance L1 at dusk is increased by 10 lux (558), and the lighting flags i and j of the small light Ls and the headlight Lh are increased.
Lower (555) and return to the main routine (55
6).

In the off-position processing (600), FIG.
As shown in FIG. 7, after turning off the small light relay 4a and the head relay 4b to turn off the small light Ls and the headlight Lh (601, 602), the lighting flag j of the headlight Lh is read (603), and the flag is read. When j stands, the reference values of the night illumination illuminance L2 and the dusk illumination illuminance L1 are reduced by 10 lux each (604), and the values are saved (605), and the small light Ls and the headlight Lh are saved. The lighting flags i and j of (6) are lowered (606) and the process returns to the main routine (60).
7). On the other hand, when the lighting flag j of the headlight Lh is read and the flag j is lowered (603), the lighting flag i of the small light Ls is read (608), and when this flag i is set, it is turned on at dusk. After reducing the reference value of the illuminance L1 by 10 lux, the value is saved (609), and the small light Ls and the headlight L
The lighting flags i and j of h are lowered (606), and the process returns to the main routine (607). Further, when the lighting flag i of the small light Ls is lowered, the small light L
The lighting flags i and j of s and the headlight Lh are lowered (60
6) Return to the main routine (607).

In the manual processing (650), as shown in FIG. 9, the lighting switch 1 is read, it is read whether the switch position is set to the headlight switch position h (651), and the headlight switch position is set. If
The small light relay 4a and the headlight relay 4b are turned on to turn on the small light Ls and the headlight Lh (652, 653), and the process returns to the main routine (654). If the lighting switch 1 is not set to the headlight switch position h (651), it is read whether the lighting switch 1 is set to the small light switch position s (655). If it is set, the small light relay 4a is set. ON, turn on the small light Ls (65
6) The headlight relay 4b is turned off to turn off the headlight (657), and the process returns to the main routine (654). At this time, if the lighting switch 1 is not set to the small light switch position s, the small light relay 4a and the headlight relay 4b are turned off to turn off the small light Ls and the headlight Lh (658). , 659),
The process returns to the main routine (654). Thus, in this manual process (650), the lighting process corresponding to the setting of the position of the lighting switch 1 is performed.

That is, by performing the above-described processing, this auto light control device can: When the lighting switch 1 is in the auto switch position a and the small lights Ls and the headlights Lh are lit, (a) When the lighting switch 1 is changed from the auto switch position a to the headlight switch position h, The reference illuminance of the hourly illumination illuminance L1 and the nighttime illumination illuminance L2 is not changed.

(B) When the lighting switch 1 is changed from the auto switch position a to the small light switch position s, the reference illuminance of the lighting illuminance L1 at dusk is not changed and the reference illuminance of the illumination illuminance L2 at night is 10 Looks down.

(C) When the lighting switch 1 is changed from the auto switch position a to the off position o, the lighting illuminance L1 at dusk and the lighting illuminance L2 at night
The standard illuminance is reduced by 10 lux each.

2. The lighting switch 1 is in the auto switch position a, and the small light Ls is lit,
When the headlight Lh is turned off, (a) When the lighting switch 1 is changed from the auto switch position a to the headlight switch position h, the reference illuminance of the lighting illuminance L1 at dusk is not changed and is lit at night. Increase the reference illuminance of the illuminance L2 by 10 lux.

(B) When the lighting switch 1 is changed from the auto switch position a to the small light switch position s, the illumination illuminance L1 at dusk,
The reference illuminance of the illumination illuminance L2 at night is not changed.

(C) When the lighting switch 1 is changed from the auto switch position a to the off position o, the lighting illuminance L1 at dusk is reduced by 10 lux and the reference illuminance L2 at night is not changed.

3. When the lighting switch 1 is in the auto switch position a and both the small light Ls and the headlight Lh are off, (a) When the lighting switch 1 is changed from the auto switch position a to the headlight position h, it is during dusk. The reference illuminance of the lighting illuminance L1 and the reference illuminance of the nighttime lighting illuminance L2 are each looked up.

(B) When the lighting switch 1 is changed from the auto switch position a to the small light position s, the lighting illuminance L1 at dusk is increased by 10 lux, and the reference illuminance L2 at night is not changed.

(C) When the lighting switch 1 is changed from the auto switch position a to the off position o, the lighting illuminance L1 at dusk and the lighting illuminance L2 at night
Do not change the reference illuminance.

By repeating the above processing, for example, when the lighting switch 1 is set to the auto switch position a and the small lights Ls and the headlights Lh are lit while the surroundings are still bright, When the lighting switch 1 is set to the off position o when it is felt that the lighting is not necessary, the auto light control device starts the lighting illuminance L at dusk from the operation of the switch.
1. The reference illuminance of the night illumination illuminance L2 is reduced by 10 lux, and the lighting operation is performed with the illuminance reduced by 10 lux from the next illuminance.

On the contrary, when the small lights Ls and the headlights Lh do not light up when it is felt that the surroundings have become dark, the lighting switch 1 is changed from the auto switch position a to the small light position s or the headlight position h. When set, the reference illuminance of the lighting illuminance L1 at dusk and the illumination illuminance L2 at night is increased by 10 lux, and the lighting operation is performed with the illuminance increased by 10 lux from the next illuminance. The Ls and the headlight Lh can be turned on.

Therefore, by repeating such an operation, the auto light control device can learn the driver's intention and control the lighting of the light according to the driver's preference.

Incidentally, some drivers operate the headlight Lh to turn it off in order to prevent the headlight Lh from dazzling an oncoming vehicle each time the vehicle is stopped at an intersection. The vehicle speed is read from a speed sensor provided in the vehicle, and when the vehicle speed is equal to or lower than a certain speed, the change of the lighting illuminance L1 at dusk and the illumination illuminance L2 at night may be canceled.

Further, in this embodiment, the storage of the illumination illuminance is stored in the RAM of the central processing unit, but in the case of this RAM, the power must be constantly supplied so that the contents will not be erased, so it is dark. Since the current increases, in order to prevent this, an EEPROM 25 as shown in FIG. 1 may be used instead of such a RAM.

Further, although not particularly mentioned in the embodiment, the comparator circuit 11 of the auto light controller is described.
Includes a hysteresis circuit to prevent blinking near the threshold of the reference illuminance, and a timer circuit to prevent accidental turning off when the ambient brightness changes for a moment while driving ( It goes without saying that a delay circuit) is provided.

Further, in the embodiment, the illuminance sensor 2 and the control means are separately provided, but the present invention is not limited to this. For example, a detection element is provided in the control means and a condenser lens is provided on the dashboard. It goes without saying that the present invention can also be applied to a system in which both are provided and the two are connected by an optical fiber.

Further, in this embodiment, the lighting illuminance L at dusk is
1, the change range of the nighttime illumination illuminance L2 is 10 lux, but the change range is not limited to this value.

Further, in order to eliminate a malfunction, it is possible to set a certain upper and lower limit value to the lighting illuminance L1 at dusk and the lighting illuminance L2 at night.

[0063]

According to the first and second aspects of the present invention, the control means of the automatic light control device for controlling the lighting and extinguishing of the small light and the headlight automatically turns on the small light and the headlight. Depending on the switch operation of the lighting switch to be selected, the above reference value is repeatedly changed, and the small light and headlight are turned on and off based on the changed reference value. Without adding, for example, when the driver feels that the surroundings have become dark without turning on the light, simply operate the lighting switch to the lighting position of the light to adjust the illuminance of the light to be brighter from the next time. can do.

Therefore, the illuminance at the time of automatic lighting can be automatically adjusted only by operating the switch as the driver feels. Therefore, the driver can unknowingly set the set value of the lighting illuminance of the light. It is very convenient because you can set it to your liking.

Further, for example, when the user feels dark, the adjustment can be easily performed, so that an effect can be expected from the viewpoint of safety.

[Brief description of the drawings]

FIG. 1 is a block diagram of this embodiment.

FIG. 2 is an operation explanatory view for explaining this embodiment.

FIG. 3 is an operation explanatory view for explaining this embodiment.

FIG. 4 is a flow chart diagram for explaining this embodiment.

FIG. 5 is a flowchart diagram for explaining this embodiment.

FIG. 6 is a flow chart for explaining this embodiment.

FIG. 7 is a flow chart for explaining this embodiment.

FIG. 8 is a flowchart diagram for explaining this embodiment.

FIG. 9 is a flowchart diagram for explaining this embodiment.

FIG. 10 is a diagram showing a table summarizing operations for explaining the embodiment.

FIG. 11 is a block diagram of a conventional example.

FIG. 12 is a sectional view of an illuminance sensor.

FIG. 13 is a diagram of a truth table of a conventional example.

[Explanation of symbols]

 1 Lighting switch 2 Illuminance sensor 3 Control means a Auto switch position Ls Small light Lh Headlight

Claims (2)

[Claims] 1. A small light including a side light, a tail light, and a number light, and a lighting switch having a small light switch position for turning on and off a headlight, and a headlight switch position and an off position are the small lights. It has an auto switch position to set the headlights to turn on and off automatically, and the control means presets the detection value of the illuminance sensor by operating the lighting switch to that auto switch position. In the auto light control device for controlling the turning on and off of the small light and the headlight based on the comparison result, the control means makes a predetermined change to the reference value according to the switch operation of the lighting switch. Repeatedly, and then Based on further criteria values automatic light control device being characterized in that so as to control the turning on and off the small light and headlight. 2. When the lighting switch is turned on at the auto switch position and the lighting switch is operated to the off position and the small light switch position, the reference value is lowered, while the lighting switch is turned off at the auto switch position. When the lighting switch is operated to the small light switch position and the headlight switch position, the reference value is increased so that the control device repeatedly makes a predetermined change to the reference value according to the switch operation of the lighting switch. The auto light control device according to claim 1, wherein: