JPH0924764A - Headlight irradiation direction control device for automobiles - Google Patents

Abstract

(57) Abstract: An output signal of a D / A converter 5 to which a digital signal corresponding to a steering direction and a steering angle of a steering from a steering state digital signal generating means 1 to 4 is inputted, and an irradiation direction detecting means. A device for causing the headlamp irradiation direction to follow the steering direction by operating the drive circuit 7 and driving and controlling the irradiation direction control mechanisms 8l and 8r by the disagreement signal from the comparator 6 that compares the signals from 9l and 9r. In the above, even if the vehicle is stopped at a steering angle other than 0 °, it is possible to prevent the oncoming vehicle from being dazzled.
Improve safety. SOLUTION: A vehicle stop state is detected based on a signal from a vehicle speed sensor 10 to operate a drive circuit 7 regardless of the steering direction and steering angle of the steering wheel at that time to direct the headlight irradiation direction to the front. Vehicle stop state detection circuit 100
Is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlight irradiation direction control device for a motor vehicle which makes the irradiation direction of a headlight (head lamp, fog lamp, etc.) follow the steering direction of a steering (handle).

[0002]

2. Description of the Related Art FIG. 9 is a schematic diagram showing the overall structure of an apparatus of this type.
In FIG. 9, reference numeral 51 is a steering wheel, 52 is a main part of the control device, and 53 is a headlight having a headlight irradiation direction control mechanism. Here, the headlight 53 has shown the horizontal cross section. Reference numeral 1 denotes a steering sensor attached to the steering wheel 51, which includes a rotating disk having a rotation angle signal slit and an optical sensor (both not shown).

[0003] The headlight 53 has a lens 53b mounted over the front opening of a lamp housing 53a, and a reflector 53c is disposed therein. A planar double-sided mirror 54 is pivotally supported by a support shaft 55 oriented substantially vertically. Reference numeral 56 denotes a drive unit incorporating a motor and a speed reducer (both not shown).
The double-sided mirror 54 can be tilted about a support shaft 55 via a lever / link mechanism 57. The light source bulb (not shown) and the reflector 53c are fixed in position, but when the double-sided mirror 54 tilts left and right, the light projection direction swings right and left. When the double-sided mirror 54 is at the neutral position (the position indicated by the solid line in the drawing), the center of the light is projected in the standard irradiation direction (arrow S).
Direction). Here, the standard irradiation direction generally refers to the front direction of the vehicle, and specifically refers to an irradiation direction that can produce a legal illumination pattern.

FIG. 10 is a block diagram of a conventional vehicle headlamp irradiation direction control device. In FIG.
A steering sensor similar to. The steering sensor 1 operates in conjunction with the steering steering by a pulse-shaped electric signal in which H level and L level alternate and steering 51
An H level signal is output only when (see FIG. 9) is at the center position and is supplied to the Up / Down switching circuit 2. Up /
The Down switching circuit 2 outputs a number of up signals and down signals according to the right steering angle and the left steering angle of the steering wheel, and the Up signal
/ Down is given to the counter 3. The Up / Down counter 3 counts up and down by the number of the up signal and the down signal. Up / Down counter 3
The 4-bit signal output by is input to the decoder 4 that outputs 7 bits (b1 to b7), and the decoder 4 outputs the H level only for the bit at the position corresponding to the count value. These steering sensor 1, Up / Down switching circuit 2, Up / D
The own counter 3 and the decoder 4 constitute a steering state digital signal generating means for generating a digital signal according to the steering direction and the steering angle of the steering wheel.

The D / A converter 5 outputs an analog signal having a voltage value corresponding to the bit from which the H-level signal is output among the 7-bit signal output from the decoder 4.

On the other hand, the left and right lamp units 8l and 8r constituting the left and right headlamps 53 and 53 (see FIG. 9).
Are equipped with angle sensors 9l and 9r which are irradiation direction detecting means for the left and right headlamps 53 and 53, respectively, and the headlamp irradiation direction (represented by a deflection angle) by each lamp unit 8l and 8r is defined on both sides. The signal voltage F, which is the detection signal detected by tilt angle detection of the mirror 54 (see FIG. 9),
G is fed back to the comparator 6. The comparator 6 includes an analog signal having a voltage value corresponding to the steering angle given from the D / A converter 5 and the signal voltages F and G.
And the values of the signal voltages F and G are
If it is not equal to the voltage value of the analog signal of the H level, if it is equal, the L level is set to the left and right lamp units 8l and 8r.
Is output separately for each. The motor drive circuit 7 constituting the headlight irradiation direction control mechanism drive circuit outputs the output signals from the comparator 6 for the left and right lamp units 8l and 8r. , 8r drive the motor.

As described above, the irradiation directions of the left and right lamp units 8l and 8r are controlled in accordance with the value detected by the steering sensor 1. At this time, as described above, the signal voltage F, which indicates the swing angle of the left and right headlights 53, 53,
G is controlled to be equal to the output signal of the D / A converter 5, so that the left and right headlights 53, 53
Are controlled to have the same deflection angle.

According to such a vehicle headlamp irradiation direction control device, the left and right headlamps 53, 53 (left and right lamp units) are irrespective of whether the steering wheel 51 of the vehicle is steered leftward or rightward. The irradiation directions of 8l and 8r) are controlled so as to follow the steering direction according to the steering angle. Therefore, for example, when the vehicle is turning, the headlights 53, 53 illuminate the steering direction of the driver, that is, the direction in which the vehicle turns to the front after a short time, which is convenient.

[0009]

However, the conventional device shown in FIG. 10 has the following problems. That is, when the vehicle is parked or parked, the steering steering is frequently performed in a short time, and when the steering is finished, in other words, when the vehicle is stopped, the steering angle is not 0 °. Not returned to the front steering position)
There are many things. For example, the steering angle is 10 on the right.
When steering is stopped (stopped) while the angle is 20 ° or 20 °, in the above-mentioned conventional device, the headlight irradiation direction is also 10 ° or 20 ° to the right. When the vehicle is stopped in the headlight irradiation direction such as in parallel parking, the oncoming vehicle is dazzled and the safety is deteriorated. Therefore, conventionally, improvement on this point has been demanded.

The object of the present invention was made in view of the above demands, and reduces the safety such as giving glare to an oncoming vehicle even when the vehicle is stopped at a steering angle other than 0 °. It is an object of the present invention to provide a headlight irradiation direction control device for an automobile, which does not have such a structure.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a headlamp irradiation direction control mechanism for controlling a headlamp irradiation direction, a headlamp irradiation direction detecting means for detecting a headlamp irradiation direction, and a steering operation. Steering state digital signal generating means for generating a digital signal according to a direction and a steering angle, a D / A converter for outputting an analog signal according to a digital signal from the steering state digital signal generating means, and a D / A converter And a comparator that outputs a mismatch signal when the values are equal, and a mismatch signal is output when the values are not equal, and a comparator that operates by the mismatch signal from the comparator and outputs a mismatch signal. A headlamp irradiation direction control mechanism driving circuit for driving and controlling the headlamp irradiation direction control mechanism until a coincidence signal is output. In a vehicle headlight irradiation direction control device, the headlight irradiation direction control mechanism drive circuit is detected by detecting a stopped state based on a signal from a vehicle speed sensor, regardless of the steering direction and steering angle of the steering wheel at that time. Is provided to provide a vehicle stop state detection circuit for directing the headlight irradiation direction to the front.

The vehicle stop state detection circuit detects the vehicle stop state based on the signal from the vehicle speed sensor, and activates the headlight irradiation direction control mechanism drive circuit irrespective of the steering direction and steering angle of the steering at that time to operate the headlight. Turn the light irradiation direction to the front.
That is, when the vehicle is stopped, the headlight irradiation direction is unconditionally directed to the front. As a result, even when the vehicle is stopped at a steering angle other than 0 °, the oncoming vehicle is prevented from being dazzled and safety is improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a headlight irradiation direction control device for a vehicle according to the present invention. In FIG. 1, 1 to 3, 5 to 9, F and G are respectively shown in FIG.
Is the same as 4 also indicates a decoder as in FIG.
Although only the bit at the position corresponding to the count value (steering steering angle) of the p / Down counter 3 outputs the H level, in the present invention, such an operation causes the output voltage of the vehicle stop state detection circuit described later to be the L level. Only when the output voltage of the vehicle stop state detection circuit is at the H level, the H level is output only to the output of b4.

Reference numeral 10 is a vehicle speed sensor which outputs a pulse signal having a frequency corresponding to the vehicle speed, and 11 is a unit time (constant time) t.
A counter of 4-bit outputs d1 to d4 which sequentially counts the output pulses of the vehicle speed sensor 10 per one and outputs the H level only for the bits corresponding to the respective count values, and 12 is a clock signal for giving the time t1 to the counter 11. CKL and time t2 for determining the count value at each time t1
Signal CKR for applying the clock to the priority holding circuit described later.
It is a reference clock oscillator that outputs and. Reference numeral 13 holds the level of the output voltage Q when the clock signal CKR from the reference clock oscillator 12 is at the L level, regardless of the output of the counter 11 at that time, and when the clock signal CKR at the previous count time t1 is at the L level. Further, when the clock signal CKR is at the H level, the priority holding circuit outputs the H level only when the outputs d1 to d4 of the counter 11 are all at the L level.
00. In the vehicle stop state detection circuit 100, when the vehicle stop state is detected, the output voltage Q becomes H level, and the output voltage Q becomes L level except the vehicle stop state (running state).

FIG. 2 is a time chart of each signal in the above-mentioned device of the present invention, and FIG. 3 is the same as the output of the decoder 4 with respect to the steering direction and steering angle θ in the device of the present invention.
2 is a table showing the relationship between the combination of the output voltage Q of the vehicle stop state detection circuit 100 (priority holding circuit 13) and the output voltage A of the D / A converter 5, and here, between the left and right 30 ° of the steering angle θ. Are shown separately for every 10 °.

FIG. 4 shows the relationship between the steering angle .theta. And the output voltage A of the D / A converter 5 according to the detection result of the vehicle stop state detection circuit 100, that is, the traveling state and the vehicle stop state. In the graph, the solid line shows the running state and the broken line shows the stopped state. FIG. 5 is a graph showing the relationship between the steering angle .theta. And the deflection angles of the left and right headlights in the apparatus of the present invention, divided into a running state and a vehicle stopped state. The solid line shows the traveling state and the broken line shows the vehicle stopped state.

Next, the operation of the apparatus of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. Now, it is assumed that an automobile equipped with the above-described device of the present invention is traveling with a headlight turned on. During this traveling, the counter 11 keeps the vehicle speed sensor 1
The output pulse of 0 is counted only while the clock signal CKL from the reference clock oscillator 12 is at L level.
Here, the priority holding circuit 13 controls the reference clock oscillator 12
When the clock signal CKR from L is at L level, regardless of the output of the counter 11 at that time, the previous count time t1
Is to hold the level of the output voltage Q when the clock signal CKR at L level is L level, and it is assumed that the automobile is still running at the previous count time t1 and now, the priority holding circuit is present. 13 (vehicle stop state detection circuit 100) outputs the L-level voltage Q.

Next, when the clock signal CKR from the reference clock oscillator 12 changes to the H level, all the bits of the outputs d1 to d4 of the counter 11 in the running state are not at the L level, so that the priority holding circuit 13 ( The L-level voltage Q is continuously output from the vehicle stop state detection circuit 100). At this time, if steering is being performed, a pulse-shaped electric signal is output from the steering sensor 1, and up signals of a number corresponding to the steering amount are up / D.
It is input to the Up / Down counter 3 via the down switching circuit 2. As a result, the Up / Down counter 3 starts sequentially counting up its count value from zero, and outputs a 4-bit signal corresponding to the count number to the decoder 4.

As can be seen from FIG. 3, the priority holding circuit 1
When the output voltage Q of 3 (vehicle stop state detection circuit 100) is L level, the decoder 4 outputs H level only to the bit corresponding to the count value. At this time, if the steering angle is 20 ° to the right> θ ≧ 10 ° to the right, the decoder 4 outputs the H level only from b3, and D / A
An analog voltage a3 is output from the converter 5. This output voltage a3 is input to the comparator 6 and compared with the output voltages F and G from the angle sensors 9l and 9r in the comparator 6, and when the values of the voltages F and G are not equal to the voltage a3, the comparator 6 outputs the H level. Signal is output and given to the motor drive circuit 7.

As a result, an H level signal is also output from the motor drive circuit 7, and the left and right lamp units 8l, 8r are output.
The internal motor operates and rotates in the direction in which the output voltages F and G from the angle sensors 9l and 9r approach a3. When the output voltages F and G from the angle sensors 9l and 9r become equal to a3, an L level signal is output from the comparator 6 and the motor drive circuit 7 also indicates L that means the motor is stopped.
The level signal is output and the left and right lamp units 8l,
The motor in 8r stops. Then, the deflection angles of the flat double-sided mirrors in the left and right lamp units 8l and 8r stop at 10 °. Therefore, the left and right headlights illuminate each in the right 10 ° direction.

Further, when the steering wheel is steered to the right and the steering angle becomes 20 ° → 30 °, D /
An analog voltage of a2 → a1 is output from the A converter 5 (see FIGS. 3 and 4), and the deflection angles of the flat double-sided mirrors in the left and right lamp units 8l and 8r are 20 ° → right.
At 30 ° (see FIG. 5), the left and right headlights will each illuminate in the direction of 20 ° → 30 ° to the right.

When the steering wheel is steered to the left, the operation is the same as described above, though the direction is different, and the left and right headlamps respectively illuminate the directions corresponding to the output of the D / A converter 5 (FIGS. 3 to 3). 5).

Next, a description will be given of a state in which the vehicle is stopped while the steering wheel is being steered from the running state. When the vehicle is stopped, while the clock signal CKR from the reference clock oscillator 12 is at the L level, the pulse from the vehicle speed sensor 10 is zero, so the count value of the counter 11 is also zero. Therefore, the output d1 to All four bits of d4 are also at the L level. Here, while the clock signal CKR from the reference clock oscillator 12 is at L level, the clock signal CKR at the previous count time t1 is output from the priority holding circuit 13 (the stopped state detection circuit 100) regardless of the output of the counter 11. Output voltage Q at L level
Level, that is, the L level is output to the decoder 4. After that, when the clock signal CKR becomes H level, as described above, since all the 4 bits of the outputs d1 to d4 of the counter 11 are L level, the priority holding circuit 13 (stop state detection circuit 100) outputs the H level signal. The voltage Q is output, and the H level voltage Q is applied to the decoder 4.

At this time, the steering angle is 20 ° to the right>
If .theta..gtoreq.10.degree. to the right, the H level of only b3 was output from the decoder 4 immediately before the vehicle stopped, but as described above, the output voltage Q of the priority holding circuit 13 (vehicle stopped state detection circuit 100) is H. Since it has changed to the level, the decoder 4 outputs the H level only for b4. Therefore, from the D / A converter 5, the analog voltage of a3 is changed to the analog voltage of a4 (see FIG. 3),
It is sent to the comparator 6. The operation from here is similar to the case where the steering angle θ is steered in the range of 10 ° right>θ> 10 ° left while the vehicle is traveling, and the deflection angles of the plane mirrors in the left and right lamp units 8l and 8r are the same. The operation of each part stops at 0 °. As a result, the left and right headlights are in a state of illuminating the front direction.

The above operation is the same when the steering angle is other than right 20 °> θ ≧ right 10 ° when the vehicle is stopped. In either case, when the vehicle is stopped, the left and right headlights are turned off. Each of them is controlled to illuminate the front direction.

FIG. 6 is a block diagram showing another embodiment of the vehicle headlamp irradiation direction control device according to the present invention. In FIG. 6, 1 to 9, F, and G are the same as in FIG. 100 also indicates a vehicle stop state detection circuit as in FIG.
Here, the vehicle speed sensor 10, the F / V converter 14, and the A
It is composed of a / D converter 15 and a priority circuit 16. In this case, the vehicle speed sensor 10 is the same as that shown in FIG. The F / V converter 14 converts the pulsed signal from the vehicle speed sensor 10 into an analog voltage having a value proportional to its frequency. Also, the A / D converter 15 is F
The analog voltage from the / V converter 14 is converted into a 4-bit digital signal, and the priority circuit 16 sets the H level only when all of the 4-bit outputs e1 to e4 from the A / D converter 15 are at the L level. Output, L otherwise
It outputs the level. The vehicle stop state detection circuit 100 outputs the output voltage Q at the H level when the vehicle stop state is detected, and outputs the output voltage Q in a state other than the vehicle stop state (running state).
Is at the L level, and the vehicle stop state detection circuit 100
The function itself is the same as that of the embodiment of FIG.

FIG. 7 is a graph showing the relationship of the output voltage of the F / V converter 14 with respect to the vehicle speed (in other words, the frequency of the pulse signal from the vehicle speed sensor 10) in the device of the present invention shown in FIG. FIG. 8 also shows the output voltage A of the F / V converter 14 in the device of the present invention shown in FIG.
Output E of A / D converter 15 and vehicle stop state detection circuit 10
9 is a table showing a relationship of 0 (priority circuit 16) output voltage Q.

Next, the operation of the device of the present invention according to the above-mentioned embodiment will be described with reference to FIGS. Now, it is assumed that an automobile equipped with the above-described device of the present invention is traveling with a headlight turned on. During this traveling, the vehicle speed sensor 10 outputs a pulse signal to the F / V converter 14.
The F / V converter 14 converts the signal from the vehicle speed sensor 10 into an analog voltage having a value proportional to the frequency and sends the analog voltage to the A / D converter 15. The A / D converter 15 sends a 4-bit digital signal according to the input analog voltage to the priority circuit 16.

In the current state (running state), since the A / D converter 15 outputs the H level from at least one bit of the 4-bit outputs e1 to e4, the priority circuit 16 (the vehicle stop state detection circuit 100). ) Outputs an L-level voltage Q (see FIG. 8). When the output voltage Q of the priority circuit 16 (vehicle stop state detection circuit 100) is L level, the decoder 4 outputs H level only to the bit corresponding to the count value. At this time, if steering is being performed, a pulse-shaped electric signal is output from the steering sensor 1, and up signals of a number corresponding to the steering amount are output via the Up / Down switching circuit 2.
It is input to the p / Down counter 3. This makes U
The p / Down counter 3 starts counting up its count value sequentially from zero, and outputs a 4-bit signal corresponding to the count number to the decoder 4. Thereafter, through the same operation as that of the embodiment shown in FIG. 1, the irradiation directions of the left and right headlights follow the steering direction of the steering wheel (see FIGS. 3 to 5).

Next, a description will be given of a state where the vehicle is stopped while the steering wheel is being steered from the running state. When the vehicle is stopped, no pulse signal is output from the vehicle speed sensor 10, and the analog voltage output of the F / V converter 14 is 0v (V = 0) (see FIG. 7). Therefore,
All four bits of the output of the A / D converter 15 become L level, the output voltage Q of the priority circuit 16 (vehicle stop state detection circuit 100) changes from L level to H level (see FIG. 8), and the decoder 4 receives this output. An H level voltage Q is applied.

At this time, the steering angle is 20 ° to the right>
If .theta..gtoreq.10.degree. to the right, the H level of only b3 was output from the decoder 4 immediately before the vehicle stopped, but as described above, the output voltage Q of the priority holding circuit 13 (vehicle stopped state detection circuit 100) is H. Since it has changed to the level, the decoder 4 outputs the H level only for b4. Therefore, from the D / A converter 5, the analog voltage of a3 is changed to the analog voltage of a4 (see FIG. 3),
It is sent to the comparator 6. After that, the same operation as that of the embodiment shown in FIG. 1 is performed, and the left and right lamp units 8l, 8
The operation of each part stops when the deflection angle of the plane mirror in r becomes 0 °. As a result, the left and right headlamps are in a state of illuminating the front direction (see FIGS. 4 and 5).

In the above embodiment, when the vehicle stop condition is detected, the steering steering angle θ = 0 ° from the steering condition digital signal generating means (the final stage decoder 4 in the embodiments of FIGS. 1 and 6) (FIG. In 3 right 10 °>θ> left 10 °)
Although the vehicle stop state detection circuit 100 is configured to output the H level digital signal only for b4 and direct the headlight irradiation direction to the front, the present invention is not limited to this. As long as the headlight irradiation direction control mechanism drive circuit (motor drive circuit 7) is operated and the headlight irradiation direction is directed to the front, any configuration may be used.

[0033]

As described above, according to the present invention, in the vehicle headlight irradiation direction control device for making the headlight irradiation direction follow the steering direction of the steering wheel, the vehicle speed is received from the vehicle speed sensor and the vehicle is stopped. Since the headlight irradiation direction is detected and it is directed to the front, even when the vehicle is stopped without returning the steering angle to 0 ° (without returning the steering wheel to the original front steering position), the glare of oncoming vehicles There is an effect that the safety can be improved by, for example, not giving

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the device of the present invention.

FIG. 2 is a time chart of signals of respective parts in the device of the present invention shown in FIG.

FIG. 3 is a combination of the output of the decoder with respect to the steering direction and the steering angle of the device of the present invention shown in FIGS. 1 and 6 and the output voltage of the vehicle stop state detection circuit (priority holding circuit, priority circuit) and the output voltage of the D / A converter. It is a table showing a relationship with.

FIG. 4 is a graph showing a relationship of a D / A converter output voltage with respect to a steering angle of the device of the present invention shown in FIGS.

5 is a graph showing the relationship between the steering angles of the steering wheel of the device of the present invention shown in FIGS. 1 and 6 and the deflection angles of the left and right headlights.

FIG. 6 is a block diagram showing another embodiment of the device of the present invention.

7 is a graph showing the relationship between the vehicle speed (vehicle speed sensor output frequency) and the F / V converter output voltage V of the device of the present invention shown in FIG.

8 is a table showing the relationship between the output voltage of the F / V converter of the device of the present invention shown in FIG. 6 and the output voltage of the A / D converter and the output voltage of the vehicle stop state detection circuit (priority circuit).

FIG. 9 is a schematic diagram of the overall configuration of a vehicle headlamp irradiation direction control device.

FIG. 10 is a block diagram of a conventional device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steering sensor, 2 ... Up / Down switching circuit, 3 ... Up / Down counter, 4 ... Decoder, 5 ...
D / A converter, 6 ... Comparator, 7 ... Motor drive circuit, 8l ... Left lamp unit, 8r ... Right lamp unit, 9l ... Left lamp angle sensor, 9r ... Right lamp angle sensor, 10 ... Vehicle speed sensor, 11 ... Counter, 12 ...
Reference clock oscillator, 13 ... Priority holding circuit, 14 ... F /
V converter, 15 ... A / D converter, 16 ... Priority circuit, 100 ... Stop state detection circuit.

Claims (2)

[Claims] 1. A headlight irradiation direction control mechanism for controlling a headlight irradiation direction, a headlight irradiation direction detecting means for detecting a headlight irradiation direction, and a digital signal corresponding to a steering direction and a steering angle of a steering wheel. Steering state digital signal generating means for generating a signal, a D / A converter for outputting an analog signal corresponding to the digital signal from the steering state digital signal generating means, an output signal of the D / A converter and the headlight A comparator which compares the signals from the irradiation direction detecting means and outputs a mismatch signal when the values are equal and the match signal is not equal; and a comparator which operates by the mismatch signal from the comparator and operates until a match signal is output from the comparator. Headlight irradiation direction control for automobiles, including a headlight irradiation direction control mechanism drive circuit that drives and controls the headlight irradiation direction control mechanism In the device, by detecting the vehicle stop state based on the signal from the vehicle speed sensor, the headlight irradiation direction control mechanism drive circuit is operated to operate the headlight irradiation regardless of the steering direction and steering angle of the steering wheel at that time. A vehicle headlamp irradiation direction control device comprising a vehicle stop state detection circuit for directing a direction to the front. 2. A headlight irradiation direction control mechanism for controlling the headlight irradiation direction, headlight irradiation direction detection means for detecting the headlight irradiation direction, and digital corresponding to the steering direction and steering angle of the steering wheel. A steering state digital signal generating means for generating a signal, a D / A converter for outputting an analog signal corresponding to the digital signal from the steering state digital signal generating means, an output signal of the D / A converter and the headlight. Comparing the signals from the irradiation direction detecting means, when the values are equal, the coincidence signal is output when the coincidence signals are not equal to each other, and a comparator which outputs a disagreement signal until the coincidence signal is output from the comparator. Headlight irradiation direction control for automobiles, which is provided with a headlight irradiation direction control mechanism drive circuit for driving and controlling the headlight irradiation direction control mechanism In the device, the vehicle stop state is detected based on the signal from the vehicle speed sensor, so that a digital signal corresponding to the steering angle of 0 ° is output from the steering state digital signal generating means regardless of the steering direction and the steering angle of the steering at that time. The vehicle headlight irradiation direction control device for a vehicle, comprising: a vehicle stop state detection circuit for outputting the headlight to direct the headlight irradiation direction to the front.