JPH0525696B2 - - Google Patents

Abstract

PURPOSE:To restrain the frequent variation of an illuminating direction by applying the constitution wherein an illuminating direction variable operation interlocked with a handle steering is restrained within the predetermined steering angle range so set as to have one side steering direction range larger than the other side steering direction range from the position of straight forward steering. CONSTITUTION:In the constitution wherein the illuminating direction of a lighting means such as a head lamp interlocked with handle steering is made variable, the predetermined steering angle range W is so set that the right side steering range is wider than the left side steering range on the basis of a zero steering angle or a handle position for straight forward steering, in view of dazzling caused on a driver on a vehicle running on an opposite lane. In addition, when a steering angle with handle operation is within the aforesaid range W, the illuminating direction variable operation of a head lamp interlocked with the handle operation is prevented, and control is so made as to fix the illuminating direction in the front direction of the vehicle. Also, when the steering angle is out of the aforesaid range W, the illuminating direction is varied linearly, interlocked with the handle operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cornering lamp system for a vehicle that continuously changes the direction of illumination of a lighting means in conjunction with steering wheel steering.

[Conventional technology]

Vehicles, especially automobiles, are equipped with headlights to illuminate the road ahead at night, but these headlights illuminate only the front of the vehicle, and when approaching a curve. In such a case, the direction in which the vehicle is traveling cannot be sufficiently illuminated. In other words, when cornering or the like, the vehicle is not sufficiently illuminated in the direction in which the vehicle is actually traveling, which may pose a danger.

In order to solve this problem, cornering lamp systems have been proposed in recent years that are configured to continuously vary the direction of illumination of the headlights in conjunction with the steering of the vehicle's steering wheel, illuminating the direction in which the vehicle is traveling. ing.

[Problem to be solved by the invention]

However, in such conventional cornering lamp systems, if the steering wheel is turned even slightly from the straight-ahead steering position, the direction of illumination of the headlights is changed in conjunction with the steering wheel steering. The irradiation direction would change even with a small change in the steering angle. That is, while driving, the irradiation direction of the headlights changes frequently, causing eye fatigue and mental fatigue. In addition, due to frequent changes in the irradiation direction, the life of the drive mechanism is short.
This could also be a cause of malfunctions.

In addition, in conventionally proposed cornering lamp systems, when the rotation angle of the steering wheel is 0 degrees (when the steering wheel is at the center), the deflection angle of the headlight (lamp deflection angle) is 0 degrees. (Front direction), variable irradiation direction operation is obtained. FIG. 7 is a diagram showing this irradiation direction variable characteristic. In the figure, the vertical axis shows the lamp deflection angle, and the horizontal axis shows the steering wheel rotation angle. Changes in the steering wheel rotation angle in the positive and negative directions starting from the zero point indicate right steering and left steering, and the zero point Changes in the lamp deflection angle in the positive and negative directions starting from the front direction indicate changes in the irradiation direction of the headlight in the right and left directions starting from the front direction. However, in the case of such variable irradiation direction operation,
Assuming that the steering wheel center is shifted to the right when driving straight (when the front wheels are facing forward: when the steering angle is 0 degrees), the steering wheel will be steered in such a way that the coordinate system is shown by the broken line in Figure 7. Due to the angle-lamp deflection angle characteristic, the irradiation direction is directed to the right when driving straight, which may dazzle oncoming vehicles.

[Means to solve the problem]

The present invention has been made to solve such problems, and it is possible to perform steering wheel steering within a predetermined steering wheel rotation angle range in which a steering direction area on one side starting from the steering wheel center is set wider than a steering direction area on the other side. The apparatus includes an irradiation direction variable operation blocking means for blocking the interlocking irradiation direction variable operation and keeping the irradiation direction of the lighting means directed to a predetermined position in the one-side steering direction.

[Effect]

Therefore, according to the present invention, within a predetermined steering wheel rotation angle range starting from the steering wheel center, the irradiation direction variable operation in conjunction with steering wheel steering is prevented, and the irradiation direction of the lighting means is directed to a predetermined position in the one-side steering direction. Leave it as it was.

〔Example〕

Hereinafter, the vehicle cornering lamp system according to the present invention will be explained in detail. FIG. 5 is a irradiation direction variable characteristic diagram showing the basic principle of the cornering lamp system, which is the first stage of the present invention. In this case, as can be seen from the characteristic diagram, the irradiation direction variable operation is performed in conjunction with steering wheel steering within a predetermined steering wheel rotation angle range W in which the right steering direction region is set wider than the left steering direction region starting from the steering wheel center. This prevents the headlights from moving forward, keeping the headlights directed toward the front. Then, continuous variable operation of the irradiation direction is permitted for right steering and left steering from the time when the steering wheel is out of the predetermined handle rotation angle range W.

Therefore, the illumination direction is not changed in response to small changes in steering angle when changing lanes, etc., so the illumination direction of the headlights does not change frequently while driving, and it is safe for the eyes. It is possible to realize a cornering lamp system that is safe and reduces fatigue by reducing fatigue and mental fatigue. Furthermore, since the irradiation direction does not change frequently, the life of the drive mechanism can be extended and reliability can be improved.

In addition, if the steering wheel center is shifted to the right when driving straight, that is, when the steering angle is 0 degrees, the steering angle-ramp deflection angle characteristic will be as shown in the coordinate system shown by the broken line in Figure 5. The irradiation direction remains directed toward the front and does not move, so there is no risk of dazzling oncoming vehicles when driving straight ahead. In this case, the area for blocking the variable irradiation direction operation in the left steering direction will expand, but since the initial setting of the area for blocking the variable irradiation direction in the left steering direction is narrow, it will not widen significantly. Therefore, the operation of changing the direction of illumination toward the pedestrian is only slightly delayed. In other words, in the normal case where there is no shift in the irradiation direction variable operation toward the right steering direction, the irradiation direction variable operation toward the pedestrian side is performed at an earlier point in time, ensuring safety while driving. .

FIG. 2 is a block diagram showing an embodiment of a cornering lamp system to which the above-described principle is applied. In the figure, reference numeral 5 inputs a pulsed electric signal sent out from a rotational position detection center (steering angle sensor) 100 (Fig. 3), and processes signals (up signal and down signal) according to steering wheel steering.
6 is this UP/DOWN switching circuit that sends out
This is an up/down counter that receives the processed signal sent out by the UP/DOWN switching circuit 5.

The steering angle sensor 100 is composed of a rotating disk 1 that rotates in conjunction with steering wheel steering, and photo interrupters 2 to 4 each having a light emitting element and a light receiving element. Slits 1 of the same shape at equal angular intervals (predetermined angular pitch P)
a has been established. And this slit 1a
Photo interrupters 2 and 3 are arranged adjacent to each other at the passing positions of the photo interrupters 2 and 3, and as the rotary disk 1 rotates, the photo interrupters 2 and 3 pass through the slit 1a, as shown in FIGS. 4a and 4b. Pulsed electrical signals having the same waveform and alternating "1" and "0" levels are generated. In other words, from the steering condition shown in Figure 3, if you turn the steering wheel clockwise (clockwise in Figure 3), the electric signal in the positive direction centering on point N will move counterclockwise. When rotated, an electrical signal in the negative direction centered at point N is generated. The electrical signal generated in the photo interrupter 2 is 90 degrees ahead of the electrical signal generated in the photo interrupter 3, and is at the ideal origin position (steering neutral position) of the rotating disk 1, that is, at the fourth position. At point N shown in the figure, the electrical signal generated in the photo interrupter 2 is in the falling or rising period when it changes from the "1" level to the "0" level or from the level "0" to the "1" level, and the photo interrupter The electrical signal generated at 3 is in the "0" level state. The electrical signals sent from the photo interrupters 2 and 3 are input to the UP/DOWN switching circuit 5.

On the other hand, a slit 1b serving as an origin zone is independently provided at a predetermined rotational angle position on the outer peripheral edge surface of the rotating disk 1, and a photointerrupter 4 detects passage through the slit 1b. That is, the rotational position where the slit 1b faces the photo interrupter 4 is the origin range of the rotary disk 1, and the angular width of this origin range, that is, the angular width α of the slit 1b, is determined by the serration deviation between the steering shaft and the handlebar. The setting is set to exceed the worst-case assembly error, which takes into account installation tolerances between the steering shaft and steering sensor, poor wheel alignment, etc. In this embodiment, the angular width α of the slit 1b is set to 60°, and in the inventor's investigation, a value of 50° was experimentally obtained as the worst case of the assembly error, so the angular width α of the slit 1b is
If the angle is set to 60 degrees, the origin range detection signal (FIG. 4c) of level "1" can be obtained as the electric signal sent by the photo interrupter 4 whenever the vehicle is traveling straight. Then, this "1" level origin range detection signal is supplied to the first input terminal of the three-input OR gate 11 via the terminal 101, the AND gate 21, and the inverter 10 in FIG. It's summery.

Here, the photo interrupter 4 is connected to the rotating disk 1
At the origin position which is ideal in the design of
At point N shown in the figure, the angular width α of the slit 1b
It is located in the center of the city. In addition, in this embodiment, the angular width α of the slit 1b is three times the angular pitch P of the slit 1a (3 angular pitch).
It is set slightly wider.

On the other hand, the UP/DOWN switching circuit 5 processes the input pulsed electric signal and sends out up/down signals according to the amount of right and left steering of the steering wheel. DOWN
The counter 6 is configured to up-count or down-count its count value by the number of input up signals or down signals. That is, the count value of the UP/DOWN counter 6 is basically set to ±0 based on the ideal origin position in the setting of the rotating disk 1.
When the steering wheel is turned to the right, the count value increases sequentially at each falling edge of the output of the photo interrupter 2. Further, by turning the steering wheel to the left, the count value is sequentially decreased at each rising edge of the output of the photo interrupter 2. That is, in FIG. 4, if the handle is rotated to the right from point N, the count value in the UP/DOWN counter 6 will increase to +1 at point a, and +1 at point b.
2, and if the rotation is made to the left from point N, the count value in the UP/DOWN counter 6 will sequentially decrease to -1 at point c and -2 at point d. The count value of the UP/DOWN counter 6 is input to digital comparators 8 and 9, and the comparison output of the comparators 8 and 9 is applied to one end of AND gates 13 and 14 via an OR gate 12. It has become a thing. Note that the comparator 8 has
The count value of the UP/DOWN counter 6 is set to +3 as the reference value for the right movement start point, and the comparator 9 has the count value of the UP/DOWN counter 6.
The count value at -1 is set as the left movement starting point reference value. Then, when the input count value of the comparator 8 becomes +3 or more, the comparison output becomes the "1" level,
In comparator 9, its input count value is -
The following results in the comparison output being at the "1" level.

On the other hand, at the other ends of AND gates 13 and 14
The UP signal and the DOWN signal sent out by the UP/DOWN switching circuit 5 are inputted.
The UP and DOWN signals passing through the AND gates 13 and 14 are input to a second UP/DOWN counter 16. Then, the count value of this UP/DOWN counter 16 is given to the D/A converter 7, and via this D/A converter 7, a voltage value corresponding to the count value of the UP/DOWN counter 16 is applied to the inverting input of the comparator 17. It is supposed to be set at the end. A sawtooth waveform reference voltage with a period of 20 msec is set at the non-inverting input terminal of the comparator 17 via a sawtooth wave generator 18.

On the other hand, the clock signal sent from the reference clock generator 15 is applied to the other end of the AND gate 21, and the counter is activated by a count-up operation based on the clock signal that passes through the AND gate 21 and is input. An overflow signal (CARRY signal) of "1" level is sent from 19,
This "1" level CARRY signal is applied to the UP/DOWN counters 6 and 16 as a reset signal. Then, UP/
The up signal and down signal sent out by the DOWN switching circuit 5 are inputted, and the one-shot multivibrator (hereinafter simply referred to as A one shot signal (referred to as one shot) is sent out from 20, and this one shot signal is given to the counter 19 as its reset signal.

Note that, like the UP/DOWN counter 6, the count value of the UP/DOWN counter 16 is basically set to ±0 with respect to the origin position which is ideal in the design of the rotating disk 1. Further, when the count value of the UP/DOWN counter 16 is ±0, the voltage value set to the inverting input terminal of the comparator 17 via the D/A converter 7 is set to the inverting input terminal of the comparator 17 via the sawtooth wave generator 18. It is assumed to be located at the center of the vertical width of the sawtooth reference voltage set at the inverting input terminal, and therefore the control signal sent from the output terminal of the comparator 17 at this time is a periodic signal with a duty ratio of 50%. It becomes a pulse signal. Then, as the count value in the UP/DOWN counter 16 increases or decreases, the set voltage value to the inverting input terminal of the comparator 17 decreases or increases in the D/A converter 7 according to the count value that increases or decreases. I'm starting to do that. That is, the pulse width of the control signal periodically sent from the output terminal of the comparator 17 is
Depending on the count value in , it becomes wider as it goes up and becomes narrower as it goes down. A control signal sent from the output terminal of the comparator 17 (output terminal 30c of the control signal generation circuit 30) is input to the servo motor control circuit 40 via its input terminal 40a.

The servo motor control circuit 40 has an input terminal 40a.
a motor drive time calculation circuit 42 and a rotation direction determination circuit 43 which take the output of this position deviation detection circuit 41 as input, and a motor drive time calculation circuit 4
2 and the output of the rotation direction determination circuit 43 as inputs.
AND gate circuit 44 and this AND gate circuit 4
4, and a potentiometer 47 whose output voltage is varied according to the rotational angular position of the electric motor 46. The specific configuration and operation of this servo motor control circuit 40 have been explained in detail in Japanese Patent Application No. 78533/1983 previously filed by the applicant, so a description thereof will be omitted here. That is,
By widening the pulse width of the control signal sent from the output terminal 30c of the control signal generation circuit 30, the irradiation direction of a headlamp (not shown) driven by the electric motor 46 is linearly varied in the right steering direction. Further, the output terminal 30 of the control signal generation circuit 30
By narrowing the pulse width of the control signal sent from c, the irradiation direction of the headlight is linearly varied in the left steering direction. Also, UP/DOWN counter 6
When the count value in is ±0, the irradiation direction of the headlight is fixed to face the front.

Next, the operation of the cornering lamp system configured as described above will be explained. That is, now,
It is assumed that the count values of the UP/DOWN counters 6 and 16 are ±0, and the irradiation direction of the headlight is fixed facing forward. At this time, the output terminal 30c of the control signal generation circuit 30 outputs 50% as a control signal to the motor control circuit 40.
A periodic pulse signal with a duty ratio is sent out. In such a state, when the steering wheel is rotated from the straight-ahead steering position and, for example, right steering is started, the count value in the UP/DWON counter 6 increases according to the amount of right steering, and the count value becomes ±3. At this point, the comparison output of the digital comparator 8 becomes "1" level. That is, the comparison output of digital comparator 8 passes through OR gate 12 and is applied to one end of AND gates 13 and 14, and from this point on,
The UP signal sent by the UP/DOWN switching circuit 5 is
It is now given to the UP/DOWN counter 16. That is, when the count value in the UP/DOWN counter 6 is set to ±3 or more, the UP signal that is generated causes the count value in the UP/DOWN counter 16 to increase, and the inverting input terminal of the comparator 17 is output according to the increased count value. The set voltage value decreases. Therefore, comparator 1
The duty ratio of the pulse signal sent out from the output terminal of 7, that is, the control signal input to the servo motor control circuit 40 via the output terminal 30c of the control signal generation circuit 30 increases, and the pulse width of the control signal is widened. become. In other words, UP/DOWN counter 6
The direction of illumination of the headlights changes linearly toward the right steering direction in conjunction with the steering wheel after the wheel count value reaches ±3 or more.

On the other hand, if you turn the steering wheel from the straight-ahead steering position and start steering to the left, the count value in the UP/DOWN counter 6 will decrease according to the amount of left steering, and when the count value reaches -1, , the comparison output of the digital comparator 9 becomes "1" level. That is, the comparison output of the digital comparator 9 passes through the OR gate 12 and is applied to one end of the AND gates 13 and 14, and from this point on, the down signal sent out by the UP/DOWN switching circuit 5 is applied to the UP/DOWN counter 16. will be given to That is, UP/
The DOWN signal that is generated when the count value in the DOWN counter 6 is -1 or less causes the UP/
The count value in the DOWN counter 16 goes down, and the voltage value set at the inverting input terminal of the comparator 17 goes up in accordance with the down count value. Therefore, the duty ratio of the pulse signal sent from the output terminal of the comparator 17, that is, the control signal input to the servo motor control circuit 40 via the output terminal 30c of the control signal generation circuit 30, decreases, and the pulse signal of the control signal decreases. The width becomes narrower. In other words, the direction of illumination of the headlights changes linearly toward the left steering direction in conjunction with steering wheel steering after the count value in the UP/DOWN counter 6 becomes -1 or less.

Note that the above operation occurs when the car is traveling straight.
The basic operation has been explained assuming that the rotary disk 1 is located at the ideal designed origin position in the true straight-ahead steering position, but due to assembly errors, the rotating disk 1 may not be located at the ideal designed origin position. In cases where the UP/DOWN counters 6 and 16 are out of alignment, the count values in UP/DOWN counters 6 and 16 are quickly corrected as shown below, and the direction of headlight illumination is controlled in conjunction with steering wheel steering without any problems. It becomes possible.

In other words, if the rotating disk 1 is at the ideal origin position, it will move from the Z1d point shown in Figure 4.
When the range up to point Z2b is defined as the origin zone in slit 1b, within the region from point c to point a (hereinafter referred to as the first subzone) that divides this origin zone, while driving straight, UP /
The count value in the DOWN counter 6 continues to be ±0 for a longer time. That is, while the origin range detection signal at the "1" level is input through the terminal 101, the count value in the UP/DOWN counter 6 continues to be +1 and -1 for a longer period of time when it continues to be ±0. It will be longer than time. That is, while the origin range detection signal at the "1" level is being input through the terminal 101, the clock signal sent from the reference clock generator 15 passes through the AND gate 21 and is supplied to the counter 19. UP／
When a predetermined period of time has elapsed with the count value in the DOWN counter 6 maintaining ±0, the counter 19 sends out a CARRY signal at the "1" level due to the count-up operation based on the supplied clock signal, and this "1" level The CARRY signal is given to the UP/DOWN counters 6 and 16 as a reset signal. As a result, UP/
The count values in DOWN counters 6 and 16 are returned to ±0. in this case,
The count values in the UP/DOWN counters 6 and 16 are already ±0, and based on such operations, the count values in the UP/DOWN counters 6 and 16 will continue to maintain ±0 in the straight-ahead steering position.

In other words, by appropriately determining the number of increments until the input clock signal to the counter 19 overflows, the counter can be The clock signal count operation at step 19 is UP/
It is assumed that the reset is performed based on the up signal and down signal via the DOWN switching circuit 5.

On the other hand, if the rotating circular body 1 is deviated from the ideal design origin position due to assembly error, the count value on the UP/DOWN counter 6 will be +1 or - while driving straight. 1 for a longer period of time. Within the area from point a to point b (hereinafter, this area will be referred to as the second subzone) that divides the origin zone, or within the area from point c to point d (hereinafter, this area will be referred to as the third subzone). ), the time during which the count value of the UP/DOWN counter 6 continues to be +1 or -1 is ±0 within the first subzone.
It will be longer than the time it takes to continue.

UP/DOWN counter 6 in second subzone
When the count value of UP/DOWN counter 6 continues to be ±1 for a long time, when the count value of UP/DOWN counter 6 is +1, that is, when the second subzone of the three subzones is being detected, The CARRY signal of the "1" level is now sent out, and the count values in the UP/DOWN counters 6 and 16 are returned to ±0. That is, the second subzone is quickly determined to be the origin position, the count values in the UP/DOWN counters 6 and 16 are corrected, and the direction of illumination of the headlight is reliably directed toward the front of the vehicle at the straight-ahead steering position. Become something.

Furthermore, if the time period in which the count value of the UP/DOWN counter 6 continues to be -1 in the third subzone becomes longer, when the count value of the UP/DOWN counter 6 is -1, that is, among the three subzones, At the time when the third subzone is detected, the counter 19 sends out a CARRY signal of "1" level, which causes the UP/
The count values in DOWN counters 6 and 16 are returned to ±0. That is, the third subzone is quickly determined to be the origin position, the count values in the UP/DOWN counters 6 and 16 are corrected, and the direction of illumination of the headlights is reliably directed toward the front of the vehicle at the straight-ahead steering position. Become something.

In the above description, the variable irradiation direction characteristic shown in FIG. 5 has been explained as a basic principle as a prelude to the present invention, but the present invention uses the variable irradiation direction characteristic as shown in FIG. 1 as a basic principle. That is, within a predetermined steering wheel rotation angle range W in which the right steering direction region is set wider than the left steering direction region starting from the steering wheel center, the illumination direction variable operation linked to steering wheel steering is blocked, and the headlight illumination is The direction remains directed to a predetermined position on the left side of the vehicle. Regarding right steering and left steering from the time when the steering wheel is out of this predetermined steering wheel rotation angle range W,
Allows continuous variable operation of its irradiation direction. By having such a variable irradiation direction characteristic, the irradiation direction is directed to a predetermined position on the left side of the front of the vehicle when the vehicle is traveling straight, and the field of view toward pedestrians is widened. In addition, if the steering wheel center is shifted to the right when driving straight, the blocking area for changing the illumination direction toward the left steering direction will expand, and the operation for changing the illumination direction toward pedestrians will be delayed. Safety is maintained because the irradiation direction is already directed toward the pedestrian. FIG. 6 shows an embodiment of a cornering lamp system to which this irradiation direction variable characteristic is applied as the basic principle.

In this figure, the same reference numerals as those in FIG. 2 indicate equivalent components, and the explanation thereof will be omitted. The differences in this cornering lamp system from Fig. 2 are as follows:
The count value of the UP/DOWN counter 16 is basically set at -1 with respect to the origin position which is ideal in the design of the rotating disk 1. Then, CARRY sent out by counter 19
A signal is given to the UP/DOWN counter 16 as a load signal, and based on this given load signal,
The count value in the UP/DOWN counter 16 is set to -1.

In the cornering lamp system configured in this way, the comparators 8 and 9 do not send out comparison outputs at the "1" level within the range where the count value of the UP/DOWN counter 6 is from -1 to +3, so the UP/DOWN The UP signal and the DOWN signal sent from the UP/DOWN switching circuit 5 are not input to the DOWN counter 16. That is, within the range where the count value of the UP/DOWN counter 6 is -1 to +3,
The initial count value (-1) in the UP/DOWN counter 16 causes the irradiation direction of the headlight to be fixed at a predetermined deflection angle position on the left side of the front of the vehicle.

In each of the embodiments described above, the irradiation direction variable operation is prevented within a predetermined steering angle range W in which the right steering direction region is set wider than the left steering direction region starting from the straight steering position. Needless to say, in countries where drivers drive on the right, the irradiation direction variable operation is blocked within a predetermined steering angle range W in which the left steering direction area is set wider than the right steering direction area starting from the straight steering position. stomach. In this case, in the embodiment shown in FIG.
Needless to say, while the irradiation direction variable operation is inhibited, the irradiation direction is fixed at a predetermined deflection angle position on the right side of the front of the vehicle.

In each of the embodiments described above, the device for determining the origin position of a rotating body is configured as a hardware using a specific circuit, but it can also be implemented using a software technique using a microcomputer or the like.

〔Effect of the invention〕

As explained above, according to the vehicle cornering lamp system according to the present invention, the cornering lamp system is linked to steering wheel steering within a predetermined steering wheel rotation angle range in which the steering direction area on the other side is set wider than the steering direction area on one side starting from the steering wheel center. The irradiation direction variable operation prevention means prevents the irradiation direction variable operation and keeps the irradiation direction of the lighting means directed to a predetermined position in the one side steering direction, so that small steering operations such as when changing lanes are provided. By not performing the irradiation direction variable operation in response to changes in the angle, it is possible to suppress frequent changes in the irradiation direction, and it is possible to reduce eye strain and mental fatigue of the driver. Further, the life of the drive mechanism can be extended and reliability can be improved.

Further, according to the present invention, when the steering wheel center shifts toward the oncoming vehicle when driving straight, the irradiation direction remains directed toward a predetermined position on the pedestrian side and does not move, thereby dazzling the oncoming vehicle. It is possible to prevent this from happening. In addition, in this case, the blocking area for changing the irradiation direction toward the pedestrian will expand and the irradiation direction changing operation toward the pedestrian will be delayed, but the irradiation direction has already been offset toward the pedestrian. safety is maintained.

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram of variable irradiation direction showing the basic principle of the vehicle cornering lamp system according to the present invention, and FIG. 2 shows an embodiment of the cornering lamp system to which the basic principle shown in FIG. 5 is applied. FIG. 3 is a schematic block diagram showing the steering angle sensor used in this system, FIG. 4 is an output waveform diagram of this steering angle sensor, and FIG. 5 shows the basic principle of the cornering system, which is the first stage of the present invention. Fig. 6 is a block configuration diagram showing an example of a cornering lamp system that applies the basic principle shown in Fig. 1, and Fig. 7 shows a characteristic diagram of variable irradiation direction of a conventional cornering lamp system. FIG. 3 is a diagram showing characteristics. 5...UP/DOWN switching circuit, 6, 16...
UP/DOWN counter, 7...D/A converter, 8, 9...Digital comparator, 15...
...Reference clock generator, 17...Comparator,
18...Sawtooth wave generator, 19...Counter,
100...Steering angle sensor.

Claims (1)

[Scope of Claims] 1. In a vehicle cornering lamp system that continuously changes the direction of illumination of a lighting means in conjunction with steering wheel steering, the steering direction area on one side starts from the center of the steering wheel and the steering direction area on the other side starts from the steering wheel center. An irradiation direction that prevents the irradiation direction variable operation in conjunction with the steering wheel steering within a widely set predetermined steering wheel rotation angle range, and keeps the irradiation direction of the lighting means directed to a predetermined position in the one side steering direction. A cornering lamp system for a vehicle comprising a variable movement prevention means.