JPH0574494B2 - - Google Patents

Abstract

PURPOSE:To reduce the extent of slippage between the center of a lighting range and the forward direction, by making the variable timing of a lighting direction of a lighting device at the steering direction side quicker than that of the lighting direction of another lighting device at the opposite steering direction side. CONSTITUTION:Both lighting ranges of a right headlamp and a left headlamp accord with each other as shown in (a) at that point that a steering angle is at 0 deg.. From this state, when right steering is started, a lighting direction of a right headlamp is varied to a deflection angle position at right 10 deg. at that point that the steering angle comes to 5 deg.. At this time, a lighting direction of a left headlamp is kept in the front direction so that the center of the lighting range made by both right and left headlamps comes to the right direction 5 deg. as shown in (b). In addition, when the steering angle comes to 10 deg., the lighting direction of the left headlamp is varied to the deflection angle position at the right 10 deg..

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a cornering lamp system for a vehicle, which includes lighting means on the left and right sides of the front of the vehicle, and in which the direction of illumination of the lighting means is varied in stages in conjunction with steering wheel steering. It is related to.

[Conventional technology]

Vehicles, especially automobiles, are equipped with headlights on the left and right sides of the front of the vehicle as lighting means for illuminating the area ahead at night, but these headlights illuminate only the front of the vehicle in a fixed manner. , when the vehicle approaches a curve, etc., 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.

Therefore, in order to improve this problem, in recent years, step-driven cornering lamps have been developed which are configured to illuminate the direction in which the headlights are traveling by varying the illumination direction of the headlights in stages in conjunction with the steering wheel of the vehicle. system is proposed. Generally, in such a cornering lamp system, the variable timing of the irradiation direction of the left and right headlights is synchronized, and the irradiation direction is shifted toward the steering direction by the amount of the steering angle at each predetermined steering angle interval. The structure is as follows. For example, if the steering angle interval is set to 10 degrees, the illumination direction of the left and right headlights can be swung step by step in synchronization with the steering direction by 10 degrees in conjunction with steering wheel steering.

[Problem that the invention seeks to solve]

However, in such a cornering lamp system, the deflection angle is relatively large with respect to the irradiation range of the headlights, so there is a large deviation between the direction of travel of the vehicle and the center of the irradiation range of the headlights. This caused the problem that sufficient visibility was not secured during cornering.

For example, assume that the irradiation range of the headlight is 30 degrees and the gradual deflection angle is 10 degrees. Now, assuming that the direction of travel of the car coincides with the center of the irradiation range of its headlight (Fig. 5a), the center of the irradiation range of the headlight indicated by the dashed line in the figure is direction of travel is to the right or left with the center at that point
Start moving to the right or left when the change is more than 10 degrees.
Changes by 10°. Figure 5b shows the relationship between the center of the irradiation range of the headlight and the direction of travel of the vehicle (double-dashed line in the figure) just before the vehicle's travel direction reaches a position 10 degrees to the right. It can be seen that a large deviation occurs between the center of the irradiation range and the direction of travel.

In addition, in such a cornering lamp system, the operating point for variable illumination direction from one side to the other and the variable operating point for illuminating direction from the other side to one side are the same, so the variable operating point can be changed back and forth. There was a problem that chattering occurred when the steering wheel was turned.

[Means for solving problems]

The present invention has been made in view of the above-mentioned problems, and the timing of changing the irradiation direction of the lighting means on the steering direction side is made earlier than the timing of changing the irradiation direction of the lighting means on the side opposite to the steering direction. , the irradiation direction is made to have hysteresis in the stepwise change from one side to the other side after the stepwise change from one side to the other side.

[Effect]

Therefore, according to the vehicle cornering lamp system according to the present invention, it is possible to reduce the deviation between the center of the irradiation range and the direction of travel as much as possible, and at the same time, it is possible to suppress the gradual change in the irradiation direction. This can prevent the chattering phenomenon.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The vehicle cornering lamp system according to the present invention will be described in detail below. FIG. 1 is a block circuit diagram showing one embodiment of this cornering lamp system. In the figure, reference numeral 1 denotes a steering wheel rotation angle sensor that sends out pulsed electric signals alternating between "1" level and "0" level in conjunction with steering wheel steering, and 2 denotes this steering wheel rotation angle sensor 1.
an UP/DOWN switching circuit which receives as input a pulsed electric signal sent out by the steering wheel and sends out a number of up signals and down signals from its output terminals 2a and 2b according to the amount of right and left steering of the steering wheel;
are UP/DOWN counters, 4 and 5, which input the UP signal and the DOWN signal sent out by this UP/DOWN switching circuit 2, and use the count value as an up count or a down count by the number of input UP signals or DOWN signals. Box's
This is a decoder/driver that inputs the count value sent by the UP/DOWN counter 3 and sets only the level of the output terminal at the position corresponding to this count value to the "0" level.

The count value in the UP/DOWN counter 3 is set to zero when the steering wheel (not shown) is in the straight steering position, and as the steering wheel is rotated clockwise around that point, the count value increases sequentially. Counterclockwise rotation causes the count value to decrease sequentially. Then, the decoders/drivers 4 and 5 set the levels of the output terminals 4h and 5h to the "0" level when the count value of the counter 3 is zero, that is, when the steering wheel is located at the straight steering position. Each time the count value of the counter 3 increases by 5 degrees in terms of the steering angle, the output terminal position at which the output terminal becomes "0" level becomes the adjacent output terminal 4i and 5.
i, 4j and 5j, . . . 4o and 5o. Also, each time the count value in the counter 3 decreases from zero to the steering angle by 5 degrees, the output terminal position that becomes "0" level is changed to the adjacent output terminals 4g and 5g, 4f and 5f, ... 4a and 5a. It is gradually being postponed. Of course, it goes without saying that even during countdown after count-up or count-up after countdown in the counter 3, the output terminal position at the "0" level is successively carried down or carried forward to the adjacent output terminal position. . Then, output terminals 4a, 4 of the decoder/driver 4
b, 4d, 4f, 4i, 4k, 4m, 4n, 4o
are the connecting terminals 4 _-1 , 4 _-2 , 4 _-3 , 4 _-4 , 4 _-5 , respectively
Directly connected to _4-6 and _4-7 , decoder/
Output terminals 5a, 5b, 5c, 5e of driver 5,
5g, 5j, 5l, 5n, 5o are connection terminals 5, respectively.
_-1 , _5-2 , _5-3 , _5-4 , _5-5 , _5-6 , _5-7 are directly connected. In addition, output terminals 4c, 4e, 4g, 4h, 4 of the decoder/driver 4
j, 4l are inverters 6a, 6b, 6c, 6d,
NAND gates 7a, 7b, via 6e, 6f,
7c, 7d, 7e, 7f, 7g, 7h, 7i, 7
NAND gates 7a, 7b, 7c, 7d, 7e, 7f,
The outputs of 7g, 7h, 7i, 7j, 7k, and 7l are connected to connection terminals 4 _-1 , 4 _-2 , 4 _-3 , 4 _-4 , 4 _-5 , 4 _- respectively.
₆ , connected to _4-7 . In addition, output terminals 5d, 5f, 5h, 5i, 5 of the decoder/driver 5
k, 5m are inverters 8a, 8b, 8c, 8d,
Through 8e, 8f, NAND gates 9a, 9b,
9c, 9d, 9e, 9f, 9g, 9h, 9i, 9
NAND gates 9a, 9b, 9c, 9d, 9e, 9f,
The outputs of 9g, 9h, 9i, 9j, 9k, and 9l are connected to connection terminals 5 _-1 , 5 _-2 , 5 _-3 , 5 _-4 , 5 _-5 , 5 _- respectively.
Connected _{to 6,5-7} . On the other hand, NAND gates 7b, 7d, 7f, 7 on the decoder/driver 4 side
h, 7j, 7l and NAND gates 7a, 7c,
At the input end of the other side of 7e, 7g, 7i, 7k,
A signal corresponding to the current count mode of the UP/DOWN counter 3 is inputted via the output terminals 10a and 10b of the first mode signal transmitter 10. Also, NAND gates 9a, 9c, 9e, 9 on the decoder/driver 5 side
g, 9i, 9k and NAND gates 9b, 9d,
At the other input end of 9f, 9h, 9j, 9l,
A signal corresponding to the current count mode of the UP/DOWN counter 3 is inputted via the output terminals 11a and 11b of the second mode signal transmitter 11. In other words, if the count value in counter 3 is less than or equal to zero and the left side of the steering angle is
When the count value corresponding to the 5° position is within the range, the mode signal transmitter 10 sends out signals at the "0" and "1" level from its output terminals 10a and 10b, and when the count value is within the range other than the count range. In the up-count mode, signals of "0" and "1" levels are sent out, and in the down-count mode, signals of "1" and "0" levels are sent out. In addition, the mode signal transmitter 11
When the count value of the counter 3 is greater than or equal to zero and is within the range that does not reach the count value corresponding to the right 5° position of the steering angle, the output terminals 11a and 11b output "0" and "1" levels. Sends a signal, and in other count ranges,
When in up count mode, the signal is “1” and “0” level, and when in down count mode, it is “0”.
and "1" level signals are sent out.

Therefore, when the level of connection terminal 4 _-4 on the decoder/driver 4 side is at the "0" level, the right headlight (not shown) when viewed from the driver's seat faces directly ahead, and the level is "0". The connection terminal position is 4 _-3 ,
By moving down sequentially to _4-2 and _4-1 , the right headlight illumination direction changes 10 degrees to the left as seen from the driver's seat.
The angle changes gradually from 20° to 30°.
Also, the connection terminal position where the "0" level is 4 _-5 ,
By sequentially moving up to _4-6 and _4-7 , the irradiation direction of the right headlight changes stepwise to the right by 10 degrees, 20 degrees, and 30 degrees. On the other hand, when the level of connection terminal 5 _-4 on the decoder/driver 5 side is "0" level, the left headlight (not shown)
The irradiation direction of the left headlight faces directly ahead, and the connection terminal position at the "0" level is moved down sequentially to _5-3 , _5-2 , and _5-1 , so that the irradiation direction of the left headlight is directed to the left as seen from the driver's seat. The angle changes stepwise to 10°, 20°, and 30°, and the connection terminal position at the "0" level is moved up sequentially to _5-5 , _5-6 , and _5-7 . The direction of the left headlight is 10° to the right.
The angle changes gradually from 20° to 30°.
In this embodiment, it is assumed that the irradiation ranges of the right and left headlights are each set to 30 degrees.

Next, the operation of the cornering lamp system configured as described above will be explained. That is, it is assumed that the automobile is currently traveling straight ahead with its headlights on and the steering wheel is at the straight ahead steering position. At this time, the count value of the UP/DOWN counter 3 is zero, and only the output terminals 4h and 5h of the decoders/drivers 4 and 5 are "0".
level condition. At this time, NAND gates 7h and 7g on the decoder/driver 4 side, and NAND gates 9e and 9 on the decoder/driver 5 side.
Since "0" and "1" level signals are input to the other end of f via the mode signal transmitters 10 and 11, the connection terminals 4 _-4 and 5 _-4 are respectively at the "0" level. Therefore, at this time, the left and right headlights are stopped and facing forward.

However, when the steering wheel is turned clockwise in such a state and the right steering is started, the steering wheel rotation sensor (1) starts to send out a pulsed electric signal, and the up signal changes UP/DOWN according to the amount of steering wheel steering. The signal begins to be input to the UP/DOWN counter 3 via the switching circuit 2. As a result, the counter 3 starts counting up its count value sequentially from zero.
When the count value in the counter 3 reaches a value corresponding to a steering angle of 5 degrees, the decoders/drivers 4 and 5 increment the "0" level signal and send it out from their output terminals 4i and 5i. As a result, the level of connection terminal 4 _-5 on the decoder/driver 4 side is raised from connection terminal 4 _-4 to the "0" level, and the irradiation direction of the right headlight changes to a deflection angle position of 10 degrees to the right. . On the other hand, at this time, the mode signal transmitter 11 starts transmitting signals at the "1" and "0" levels from its output terminals 11a and 11b, and the other ends of the NAND gates 9g and 9h become at the "1" and "0" levels. . Therefore, even if the decoder/driver 5 sends a "0" level signal from its output terminal 5i, the output of the NAND gate 9h does not become "0" level, and the connection terminal 5
_{The -4} level continues and becomes the "0" level, and the left headlamp's irradiation direction remains facing forward.
Then, when the right steering is continued and the count value in the UP/DOWN counter 3 reaches a value corresponding to 10 degrees in terms of the steering angle, the decoders/drivers 4 and 5 advance the "0" level signal and output it to the output terminal. It will be sent from 4j and 5j.
As a result, the level of connection terminal 5 _-5 on the decoder/driver 5 side is raised from connection terminal 5 _-4 to the "0" level, and the irradiation direction of the left headlight changes to a deflection angle position of 10 degrees to the right. . On the other hand, at this time, the mode signal transmitter 10 outputs its output terminals 10a and 10.
Therefore, even if the decoder/driver 4 sends a signal of the "0" level from its output terminal 4j, the output of the NAND gate 7j is "0". level, the level of connection terminal _4-5 continues to be "0" level, and the irradiation direction of the right headlight maintains the deflection angle position of 10 degrees to the right. Below, in the same way, the steering angle is
When the steering angle reaches 15 degrees, the direction of the right headlight changes to a deflection angle of 20 degrees to the right, and when the steering angle reaches 20 degrees, the direction of the left headlight changes to a deflection angle of 20 degrees to the right. The irradiation direction of the left headlight changes step by step while following the irradiation direction of the right headlight. In addition, when steering to the left from a straight-ahead steering state, when the steering angle reaches 5 degrees, the irradiation direction of the right headlight changes to a deflection angle position of 10 degrees to the left.
Next, when the steering angle reaches 10°, the right headlight's irradiation direction changes to the deflection angle position of 10° to the left, so that the right headlamp's irradiation direction follows the left headlamp's irradiation direction. Change in stages.

FIG. 2 is a characteristic diagram of a variable irradiation direction of a headlamp whose irradiation direction changes stepwise in this manner. In the figure, the horizontal axis represents the steering angle, and the angle of change to the right in the drawing from 0° represents the right steering angle, and the angle of change to the left represents the left steering angle. The vertical axis shows the deflection angle position of the headlight in the left-right direction, and Fig. 2a shows the variable irradiation direction characteristic of the right headlamp, and Fig. 2b shows the variable irradiation direction characteristic of the left headlamp. There is. In other words, as is clear from the figure, the timing of changing the illumination direction of the headlights on the side in the steering direction is 5 degrees earlier in terms of steering angle than the timing of changing the illumination direction of the headlights on the side opposite to the steering direction. 1 of the variable timing of the headlights on the side opposite to the steering direction.
The irradiation direction of the headlight on the steering direction side changes at 1/2 of the period.

Now, if we consider the irradiation range created by the right and left headlights, for example, when the steering angle is 0°, the irradiation directions of both the right and left headlights are facing forward. Yes, the irradiation range is the third
As shown by the shaded area in figure a, they match each other,
The center of the irradiation range (dotted chain line in the figure) is located directly in front of the vehicle and coincides with the direction of travel. For example, when steering to the right is started in such a state, when the steering angle reaches 5 degrees, the irradiation direction of the headlight on the steering direction side, that is, the right headlight changes to a deflection angle position of 10 degrees to the right.
At this time, the irradiation direction of the left headlight is maintained in the front direction, so the center of the irradiation range created by the right and left headlights is in the direction of travel at that time (right direction), as shown in Figure 3b. 5°). Furthermore, when the steering angle reaches 10 degrees, the headlights on the side opposite to the steering direction change.
In other words, the irradiation direction of the left headlight changes to a deflection angle position of 10° to the right, and at this time, the irradiation direction of the right headlight is maintained at a deflection angle position of 10° to the right, so the right headlight and left headlight change. As shown in Figure 3c, the center of the irradiation range created by the beam coincides with the direction of travel (10 degrees to the right) at that time. In other words, the centers of the irradiation range created by the right and left headlights match each time the steering angle changes by 5 degrees, and the deviation of the center of the irradiation range with respect to the direction of travel is smaller than before. This will improve safety during

By the way, the above-mentioned operation was explained for the case where right steering and left steering were performed continuously from the straight-ahead steering state, but left steering after right steering,
Alternatively, even in the case of right steering after left steering, the count value in the UP/DOWN counter 3 is sequentially counted down or counted up, and the decoders/drivers 4 and 5 are output terminals at positions corresponding to this count value. Select and set its level to "0". For example, now suppose that the steering wheel is turned clockwise from the straight-ahead steering position and the output terminal 4m of the decoder/driver 4 begins to send out a "0" level signal. Therefore, at this time, the irradiation direction of the right headlight is at a swing angle position of 30° to the right. However, if you turn the handle even slightly to the left at this time, the UP/
The count value in the DOWN counter 3 decreases, and the decoder/driver 4 begins to send out a "0" level signal from its output terminal 4l. Also, if you turn even a little to the right after turning left, the UP/
The count value in the DOWN counter 3 goes up, and the decoder/driver 4 starts sending out a "0" level signal again from its output terminal 4m. Generally, the steering wheel of an automobile has some play, so that a so-called chattering phenomenon, in which countdowns and countups alternate, can occur frequently. However, in the cornering lamp system of this embodiment, even if such a chattering phenomenon occurs, the chattering phenomenon does not occur when the irradiation direction of the headlights changes, and moreover, the irradiation produced by the right and left headlights does not change. Coordination behavior with respect to the direction of travel of the center of the range is also not impaired.

In other words, the count value in the UP/DOWN counter 3 goes down, and the decoder/driver 4 loses the "0" that it had been sending out from its output terminal 4m.
Suppose that a level signal is started to be sent from the output terminal 4l. At this time, "1" and "0" level signals are sent from the output terminals 10a and 10b of the mode signal sender 10, the gate of the NAND gate 7l is opened, and the gate of the NAND gate 7k is closed. Therefore, even if the output terminal 4l goes to the "0" level, the signal position at the "0" level does not move from connection terminal _4-7 to _4-6 , and the direction of the right headlight's irradiation changes. maintains the deflection angle position of 30° to the right. Even if a chattering phenomenon occurs in which the outputs of the output terminals 4m and 4l of the decoder/driver 4 alternately go to the "0" level,
No chattering occurs when the direction of the right headlight's irradiation changes, and the deflection angle of 30° to the right continues to be maintained.
Then, when the count value in the UP/DOWN counter 3 further decreases and the decoder/driver 4 begins to send out a "0" level signal from its output terminal 4k, the connection terminals _4-6 become "0" level. The right headlight's irradiation direction changes to a deflection angle of 20° to the right. The broken lines shown in Figure 2a indicate the steering angle and deflection angle position of the right headlight in the direction of illumination when the steering wheel is rotated left and right from the maximum right steering state and maximum left steering state to return to the straight steering position. The relationship is shown, when the right steering angle becomes 20°, 10°, 0°, the deflection angle position changes to the right 20°, 10°, 0°, and the left steering angle changes to 25°, 15°, 5°. At the point when it reaches 0°, the deflection angle position changes to 20°, 10°, and 0° to the left.

Although the above-mentioned operation has been described for the right headlamp, it goes without saying that the same operation is performed for the left headlamp as well, and the chattering phenomenon when the irradiation direction of the left headlamp changes is prevented. Figure 2b
The dashed lines shown in ( ) indicate the relationship between the steering angle and the deflection angle position of the left steering light when the steering wheel is rotated left and right from the maximum right steering state and maximum left steering state to return to the straight steering position. When the angle becomes 25°, 15°, and 5°, the deflection angle position changes to the right 20°, 10°, and 0°, and when the left steering angle becomes 20°, 10°, and 0°. The deflection angle position changes from 20° to the left, 10°, and 0°.

Let's consider the illumination range created by the right and left headlights when the steering wheel is rotated counterclockwise from a steering angle of 30 degrees to the right. In both directions, the deflection angle position is 30° to the right, and the irradiation ranges coincide with each other as shown by the hatched area in Figure 4a, and the center of the irradiation range (dotted chain line in the figure) is in the direction of travel ( right direction
30°). When left steering is started in such a state, when the steering angle reaches 25 degrees, the irradiation direction of the headlight on the steering direction side, that is, the left headlight changes to a deflection angle position of 20 degrees to the right. At this time, the irradiation direction of the right headlight is maintained at a deflection angle position of 30° to the right, so the center of the irradiation range created by the right and left headlights is located at the direction of the progress at that time, as shown in Figure 4b. Matches the direction (25° to the right). Furthermore, when the steering angle reaches 20°, the headlights on the side opposite to the steering direction,
In other words, the irradiation direction of the right headlight changes to a deflection angle position of 20° to the right, and at this time, the irradiation direction of the left headlight is maintained at a deflection angle position of 20° to the right, so that the difference between the right and left headlights changes. As shown in Figure 4c, the center of the irradiation range to be created coincides with the direction of travel at that time (20 degrees to the right). Thereafter, in the same way, the centers of the irradiation ranges created by the right headlight and the left headlight coincide every time the steering angle changes by 5 degrees, and when the steering angle reaches 0 degrees, they face straight ahead. Similarly, when turning the steering wheel to the right from a steering position of 30 degrees to the left, the centers of the irradiation ranges created by the right and left headlights will match each time the steering angle changes by 5 degrees. When the angle becomes 0°, face straight ahead.

In other words, by adding hysteresis to the stepwise change in the direction of illumination from one side to the other and then the stepwise change in the direction of illumination from the other side to the other side, headlights can be controlled by play in the handle, etc. There is no chattering phenomenon when the direction of light irradiation changes, and the alignment of the center of the irradiation range created by the right and left headlights with respect to the direction of travel is not impaired in order to prevent chattering, making it easier to drive at night. The safety of the time has become even higher.

In this embodiment, the variable timing of the irradiation direction of the headlights on the steering direction side is set to 1/2 of the variable timing of the headlights on the anti-steering direction side, but it does not necessarily have to be 1/2. It is advantageous that the deviation of the center of the irradiation range with respect to the direction of movement can be made as small as possible with respect to the direction of movement, if it is varied at the time of 1/2. In addition, in this example, a hysteresis of 5° in terms of steering angle is applied to the stepwise change in the irradiation direction from one side to the other after the stepwise change in the irradiation direction from one side to the other. However, it does not necessarily have to be 5 degrees, and although the deviation of the center of the irradiation range from the direction of travel will be somewhat large, it goes without saying that it may be set to any value.

〔Effect of the invention〕

As explained above, according to the cornering lamp system for a vehicle according to the present invention, the timing at which the irradiation direction of the lighting means on the steering direction side is varied is made earlier than the timing at which the irradiation direction is varied from the lighting means on the side opposite to the steering direction. Since the stepwise change from one side to the other side of the irradiation direction is made to have hysteresis, the shift of the center of the irradiation range with respect to the direction of movement is minimized. It is possible to make the distance smaller than before, and at the same time, it is possible to prevent the chattering phenomenon when the irradiation direction changes gradually, improving safety when cornering when driving at night. .

[Brief explanation of drawings]

Fig. 1 is a block circuit configuration diagram showing an embodiment of a vehicle cornering lamp system according to the present invention, Fig. 2 is a characteristic diagram of variable irradiation direction of the right headlight and left headlamp in this cornering lamp system, and Fig. 3 is a diagram showing the relationship between the center of the illumination range created by the right headlamp and the left headlamp during right steering centered on the straight-ahead steering point in this cornering lamp system, and the direction of travel. Figure 5 shows the relationship between the center of the illumination range created by the right and left headlights and the direction of travel when steering to the left, centering on the steering point of 30 degrees to the right in the conventional cornering lamp system. FIG. 3 is a diagram showing the relationship between the center of the irradiation range and the direction of travel. 1...Handle rotation angle sensor, 2...UP/
DOWN switching circuit, 3...UP/DOWN counter,
4, 5...decoder/driver, _4-1 to _4-7 , 5
_-1 ~ 5 _-7 ... Connection terminal, 4a ~ 4o, 5a ~ 5o
...Output terminal, 6a-6f, 8a-8f...Inverter, 7a-7l, 9a-9l...NAND gate, 10, 11...Mode signal transmitter.

Claims (1)

[Claims] 1. In a cornering lamp system for a vehicle that is equipped with lighting means on the left and right sides of the front of the vehicle, and in which the direction of illumination of the light means is varied stepwise in conjunction with steering wheel steering, the timing of varying the direction of illumination of the light means on the side of the steering direction is adjusted in response to the steering wheel. Variable timing phase advance means for advancing the variable timing of the irradiation direction of the lighting means on the direction side, and a stepwise change from the other side to the one side after the stepwise change in the irradiation direction from one side to the other side. A cornering lamp system for a vehicle, characterized in that a hysteresis means is provided for providing hysteresis.