JP4453638B2 - Vehicle headlight control device - Google Patents

Vehicle headlight control device Download PDF

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JP4453638B2
JP4453638B2 JP2005282657A JP2005282657A JP4453638B2 JP 4453638 B2 JP4453638 B2 JP 4453638B2 JP 2005282657 A JP2005282657 A JP 2005282657A JP 2005282657 A JP2005282657 A JP 2005282657A JP 4453638 B2 JP4453638 B2 JP 4453638B2
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vehicle
headlight
control
switching
low
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JP2007091023A (en
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健一 池田
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マツダ株式会社
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Description

  The present invention relates to a headlight control device for a vehicle.

  2. Description of the Related Art In recent years, there has been known a vehicle headlight control device including an automatic light control unit that detects illuminance around the host vehicle and automatically turns on a headlight (Patent Document 1). This headlight control device reduces the burden on the driver by automatically turning on the headlights even when the driver does not bother to turn on the headlights when entering a tunnel in the daytime or at night.

As another system related to the headlight, there is a high beam setting control means for basically setting the headlight to a high beam when the headlight is turned on and switching to a low beam when a preceding vehicle or an oncoming vehicle is detected. In this way, the high beam setting control means makes the most of the high beam, greatly expands the front vision in night driving or the like, and greatly improves safety.
JP 2000-311789 A

  The auto light control means and the high beam setting control means are separate systems, but it is conceivable to combine both from the viewpoint of reducing the burden on the driver. That is, in a system that combines both systems, the headlight is automatically turned on by the autolight control means, and the headlight is automatically set to the high beam or the low beam according to the presence or absence of the preceding vehicle by the high beam setting control means.

  By the way, in general, the system is designed assuming all the situations that can be assumed. However, the system cannot cope with all the phenomena in the world, and there is a risk of causing a malfunction in an unexpected rare case. That is, even in a system in which the auto light control means and the high beam setting control means are combined, the headlight can be effectively controlled as described above in an assumed situation, but in an unexpected situation, Headlights may behave unexpectedly.

  For example, when passing through a tunnel in the daytime, the headlight is automatically turned on by the autolight control means and the high beam setting control means is activated. The auto light control means is configured to operate even if it is daytime when the illuminance around the host vehicle is low, but as the high beam setting control means detects the tail lamp and headlight of the vehicle ahead, it can be seen. It is configured to operate in a situation where the contrast between the tail lamp or headlight and the surrounding environment is large at night or the like. That is, the inside of the daytime tunnel is an unexpected situation for the high beam setting control means, which may cause malfunction. In fact, as a result of inventor's diligent research, when passing through a tunnel in the daytime, the headlight is frequently switched between high beam and low beam by misdetecting a relatively bright exit as a preceding vehicle. It was found that the phenomenon may occur.

  Further, the detection of the preceding vehicle or the oncoming vehicle in the high beam setting control means can be realized by, for example, taking an image in front of the host vehicle with a camera and analyzing the front image, but the optical axis of the camera is deviated, etc. In addition, even when a device constituting the high beam setting control means fails, a phenomenon that the headlight frequently switches between the high beam and the low beam may occur.

  In the first place, the high beam is effective in greatly increasing the front field of view when driving at night, but on the other hand, it is dazzling and annoying for the preceding and oncoming vehicles. In particular, when the headlight is repeatedly switched between a high beam and a low beam in a short cycle, a so-called passing state occurs, which gives discomfort to the driver as well as to the occupant of the preceding vehicle or the oncoming vehicle.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a headlight control device that combines an auto light control unit and a high beam setting control unit, and a high beam and a low beam in the high beam setting control unit. It is to prevent the driver and the occupants of the preceding vehicle and the oncoming vehicle from feeling uncomfortable by repeating the switching at a short cycle.

  In the present invention, the operation of the high beam setting control means is prohibited according to the number of times of beam switching between the high beam and the low beam within a predetermined time.

  Specifically, the first invention is configured to be switchable between a low beam and a high beam, and is detected by a headlight that illuminates the front of the host vehicle, an illuminance detection unit that detects illuminance around the host vehicle, and the illuminance detection unit. Auto light control means for turning on the headlight when the illuminance is below a predetermined value, forward vehicle detection means for detecting a preceding vehicle or oncoming vehicle ahead of the host vehicle, and the front vehicle when the headlight is turned on When neither the preceding vehicle nor the oncoming vehicle is detected by the detection means, the headlight is set to a high beam. On the other hand, when at least one of the preceding vehicle or the oncoming vehicle is detected by the forward vehicle detection means, the headlight is set. High beam setting control means for setting the beam to a low beam, and the headlight by the high beam setting control means. Headlight control apparatus for a vehicle and a switching count counting means for counting the beam switching frequency of the high beam and low beam are subject.

  The high beam setting control means prevents the headlight from being set to a high beam when the number of beam switching times counted by the switching number counting means exceeds a predetermined number within a predetermined time. And

  In the case of the above configuration, the headlight is automatically turned on when the illuminance around the host vehicle is below a predetermined value by the autolight control means. This predetermined value may be set to a general illuminance at which a general driver turns on the headlight. When the headlight is turned on by the auto light control means, the high beam setting control means automatically sets the headlight to a high beam or a low beam based on the presence or absence of a preceding vehicle or an oncoming vehicle. When the auto light control means is operating normally, when neither the preceding vehicle nor the oncoming vehicle is detected by the front vehicle detecting means, the headlight is set to the high beam, and either the preceding vehicle or the oncoming vehicle is detected. When one of them is detected by the forward vehicle detection means, the headlight is set to a low beam.

  At this time, when the number of beam switching is counted by the switching number counting means and the headlight is frequently switched between the high beam and the low beam, that is, the number of beam switching within a predetermined time becomes a predetermined number or more. When setting, the high beam is not set. Thus, the switching to the high beam or the low beam is performed in a short cycle, so that it is possible to prevent the driver and the passengers of the preceding vehicle and the oncoming vehicle from feeling uncomfortable.

  According to a second aspect of the present invention, in the first aspect, when the number of beam switching counted by the switching number counting means exceeds a predetermined number within a predetermined time and the setting of the headlight to a high beam is not performed. In addition, it is further provided with notifying means for notifying the passenger of this fact.

  In the case of the above configuration, the notification means can notify the occupant that the setting of the headlight to the high beam is not performed because there is a possibility that the high beam setting control means has malfunctioned. The occupant can be prompted to restart the light control device.

  In a third aspect based on the first or second aspect, the high beam setting control means operates when the host vehicle is traveling forward.

  As described above, the high beam is dazzling and annoying for people and vehicles ahead of the vehicle, so it is preferable not to set the high beam except when necessary. For example, when the host vehicle is not traveling forward, such as when the vehicle is backing or stopped, it is not necessary to set the headlight to a high beam and expand the front view. Thus, in the above configuration, unnecessary setting for the high beam can be prevented by operating the high beam setting control means only when the host vehicle is traveling forward.

  In a fourth aspect based on any one of the first to third aspects, the high beam setting control means operates when the vehicle speed of the host vehicle is equal to or higher than a predetermined speed.

  For example, it is not necessary to enlarge the front vision when the vehicle is slowing down during traffic jams or when the host vehicle is about to park or stop. Therefore, in the above configuration, unnecessary setting to the high beam can be prevented by operating the high beam setting control means only when the host vehicle is traveling at a predetermined speed or higher. When traveling slowly as described above, it may be better to set the headlight to a low beam and illuminate the vicinity immediately in front of the vehicle rather than illuminating the distance from the vehicle. In the above configuration, when the high beam is prohibited, the headlight is set to the low beam, so that the field of view immediately in front of the host vehicle can be brightly secured.

  According to the present invention, it is possible to monitor whether or not the headlight is frequently repeatedly switched between the high beam and the low beam by counting the number of beam switching by the high beam setting control unit. When the headlight is frequently switched between the high beam and the low beam, the setting of the headlight to the high beam by the high beam setting control means can be prevented. In this way, when it can be determined that the headlight is repeatedly switched between the high beam and the low beam in a short cycle, switching to the unnecessary high beam is prevented by preventing the headlight from being set to the high beam any more. Thus, discomfort can be prevented from being given to the driver, the preceding vehicle, and the occupant of the oncoming vehicle.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1 of the Invention
FIG. 1 is a block diagram of a headlight control apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a schematic diagram of a vehicle equipped with the headlight control apparatus.

  Reference numerals 1L and 1R are a left headlight and a right headlight respectively disposed on both sides of the front end of the vehicle V. Reference numeral 2 automatically turns on / off the headlights 1L and 1R. 1 shows a headlight control device that automatically switches light distribution between a high beam and a low beam. The headlight control device 2 includes a beam control unit (high beam setting control means) 3 for performing beam control for automatically setting the headlights 1L and 1R to a high beam / low beam, and automatically turning on / off the headlights 1L and 1R. And an auto light unit (auto light control means) 4 for performing auto light control to be turned off. The beam control unit 3 and the auto light unit 4 are connected by an in-vehicle network cable 21 so that signals can be exchanged.

  Each of the headlights 1L (1R) is constituted by one light bulb having a left low beam filament 11L (right low beam filament 11R) and a left high beam filament 12L (right high beam filament 12R), and is connected via a headlight relay 61. It is connected to a battery (not shown). When the left high beam filament 12L and the right high beam filament 12R are energized with the battery by the headlight relay 61, the headlights 1L and 1R become high beams, while the left low beam filament 11L and the right low beam filament 11R are energized. As a result, the headlights 1L and 1R become low beams.

  The beam control unit 3 includes an auto light / beam control switch 51, a beam switch 52, a shift position sensor 53 for detecting the position of the shift lever 13, a vehicle speed sensor 54 for detecting the vehicle speed of the host vehicle V, and a vehicle interior. An output signal from a camera 55 that is attached to the front side of the vehicle body of the rear mirror 14 and captures the front of the host vehicle V is input, and a high beam switching signal or headlights 1L, 1R for setting the headlights 1L, 1R to a high beam is received. A low beam switching signal to be set to low beam is output to the auto light unit 4 and a beam state signal indicating whether the headlights 1L and 1R are high beam or low beam is output to an indicator 62 provided in the meter 15.

  The auto light / beam control switch 51 is a rotary switch provided at the tip of a lever switch that constitutes the beam switch 52 provided in the vicinity of the steering wheel 16 and is “ON”, “OFF”, “AUTO”. Is configured to be selectable. The headlights 1L and 1R are turned on when "ON" is selected, the headlights 1L and 1R are turned off when "OFF" is selected, and the beam control unit is selected when "AUTO" is selected. 3 and the auto light unit 4 are turned on, and the headlights 1L and 1R are automatically turned on / off by the beam control unit 3 and the auto light unit 4.

  The beam switch 52 is constituted by a lever switch provided at the tip of the auto light / beam control switch 51, and the lever switch is tilted back and forth to set the headlights 1L and 1R to a high beam. And “low” for setting the headlights 1L and 1R to a low beam are selectable.

  The beam control unit 3 determines whether a front vehicle detection unit 31 that detects a preceding vehicle or an oncoming vehicle existing ahead of the host vehicle V, and whether the headlights 1L and 1R are set to a high beam or a low beam. A beam control unit 32 that determines and outputs the high beam switching signal or the low beam switching signal, and a beam as a switching number counting unit that counts the number of switching between the high beam and the low beam of the headlights 1L and 1R by the beam control unit 32. A switching frequency counting unit 33.

  The forward vehicle detection unit 31 detects a preceding vehicle or an oncoming vehicle from the forward image of the host vehicle V captured by the camera 55. Specifically, a front image as shown in FIG. 3 is acquired by the camera 55. In the front image, the horizon HL, the roadway 70, the preceding vehicle 71, the oncoming vehicle 72, the street lights 73, 73, and the like are imaged. In such a front image, since the horizon HL is located in the lower area LA of the image (lower 1/3 area in the present embodiment), the preceding vehicle 71 or the oncoming vehicle 72 exists in the lower area LA, and the image The sky S, street lamps 73 and 73, the upper part of the building (not shown), etc. exist in the upper area UA (in the upper 2/3 area in this embodiment). That is, if there is a portion where the illuminance is locally high in the lower area LA, the portion is considered to be the tail lamp 71l of the preceding vehicle 71 or the headlight 72l of the oncoming vehicle 72. In the upper area UA, the surrounding environment in which the vehicle V travels, such as whether it is daytime or nighttime, whether it is clear or cloudy even during the daytime, or whether it is a dark part such as a tunnel or an underground passage. Can be judged. Therefore, a portion where the illuminance is locally high in the lower area LA is detected, and the average illuminance in the upper area UA is detected. Then, the portion of the lower area LA where the local illuminance is high and the average illuminance of the upper area UA are compared. When the average illuminance is greater and the contrast is equal to or greater than a predetermined value, it is determined that the preceding vehicle 71 or the oncoming vehicle 72 is present, while the illuminance of the portion where the illuminance is locally high in the lower area LA Is smaller than the average illuminance of the upper area UA or the contrast is smaller than a predetermined value, it is determined that neither the preceding vehicle 71 nor the oncoming vehicle 72 exists. The forward vehicle detection unit 31 and the camera 55 constitute forward vehicle detection means.

  Further, the forward vehicle detection unit 31 detects not only the vehicle ahead of the preceding vehicle 71 and the oncoming vehicle 72 but also a road illumination device such as a streetlight 73. Specifically, the forward vehicle detection unit 31 detects a portion where the illuminance is locally high in the upper area UA in the forward image from the camera 55. And if the illumination intensity of the part where illumination intensity is locally large is more than predetermined value, it will determine with it being road illumination apparatuses, such as the streetlight 73. Since the street lighting device such as the street lamp 73 is located above the horizon, it is located in the upper area UA. In this upper area UA, since the streetlight 73 and the like are captured with the night sky as a background, the presence or absence of the streetlight 73 or the like can be determined by detecting a portion where the illuminance is locally high. The predetermined value of illuminance determined to be a road lighting device such as a streetlight 73 may be set to the illuminance of a general road lighting device.

  The beam control unit 32 receives the detection result of the front vehicle detection unit 31 and a lighting determination signal from the auto light unit 4 described later, and determines that the auto light unit 4 lights the headlights 1L and 1R and When there is no preceding vehicle, oncoming vehicle, or road illumination device in front of V, a high beam switching signal for setting the headlights 1L, 1R to a high beam is output. On the other hand, when it is determined that the headlights 1L and 1R are turned on by the autolight unit 4 and at least one of a preceding vehicle, an oncoming vehicle, and a road lighting device is present in front of the host vehicle V, the headlights 1L and 1R are turned into a low beam. A low beam switching signal for setting is output.

  In detail, the beam control unit 32 determines whether or not the number of beam switching counted by a beam switching number counting unit 33, which will be described later, is equal to or more than a predetermined number (3 times per 10 seconds in this embodiment) within a predetermined time. If the number of beam switching is equal to or greater than the predetermined number of times within a predetermined time, the setting of the headlights 1L, 1R to the high beam is prohibited and it is determined that the headlights 1L, 1R are turned on by the auto light unit 4. If it is, a low beam switching signal is output. At this time, the beam control unit 32 outputs a notification signal for notifying the occupant that setting to the high beam is prohibited to the indicator 62 and the buzzer 63 as notification means.

  The beam switching number counting unit 33 counts the number of times that the beam control unit 32 alternately outputs the high beam switching signal and the low beam switching signal as the number of beam switchings. Specifically, the beam switching number counting unit 33 counts the number of beam switching times once when the headlights 1L and 1R are switched from the high beam to the low beam and then switched to the high beam again.

  The auto light unit 4 includes an auto light / beam control switch 51, an illuminance sensor 56 as illuminance detection means for measuring the illuminance around the host vehicle V, and a high beam switching signal or low beam switching from the beam control unit 3. A signal is input, and an output signal for turning on or off the headlights 1L and 1R is output to the headlight relay 61.

  The illuminance sensor 56 is installed on the upper surface of the instrument panel 17, detects illuminance from ambient light incident on the vehicle through the windshield, and outputs a detection signal to the auto light unit 4.

  Then, the autolight unit 4 outputs a signal to the lighting determination unit 41 that determines whether or not to turn on the headlights 1L and 1R, and the headlight relay 61 to turn on or turn off the headlights 1L and 1R. Part 42.

  The lighting determination unit 41 receives the detection signal from the illuminance sensor 56 and determines whether the illuminance around the host vehicle V is equal to or less than a predetermined value. Specifically, when the illuminance around the host vehicle V is less than or equal to a predetermined value, a lighting determination signal is output to the lighting control unit 42, and when the illuminance around the host vehicle V is greater than the predetermined value, the extinction determination signal is controlled to be turned on. To the unit 42. In other words, the lighting determination unit 41 determines whether or not the host vehicle V exists and its location is dark based on the illuminance around the host vehicle V, and turns on / off the headlights 1L and 1R. The predetermined value is set to an illuminance that a general driver is supposed to turn on the headlights 1L and 1R. The lighting determination unit 41 also outputs a lighting determination signal and a light extinction determination signal to the beam control unit 3 in order to notify the beam control unit 3 whether or not the illuminance for turning on the headlights 1L, 1R is present. .

  The lighting control unit 42 determines whether to turn on or turn off the headlights 1L and 1R based on a signal from the lighting determination unit 41. The lighting control unit 42 also receives an output signal of the beam switch 52, and determines whether the headlights 1L and 1R are lit with a high beam or a low beam based on the state of the beam switch 52. Specifically, when a lighting determination signal is input from the lighting determination unit 41 and the beam switch 52 is set to “high”, a high beam lighting signal is output to the headlight relay 61, and a lighting determination signal is input from the lighting determination unit 41. When the beam switch 52 is set to “low”, a low beam lighting signal is output to the headlight relay 61, and when a light extinction determination signal is input from the lighting determination unit 41, a light extinction signal is output to the headlight relay 61. To do.

  However, when a high beam switching signal or a low beam switching signal is input from the beam control unit 3, the lighting control unit 42 turns on the headlights 1L and 1R with a high beam based on the high beam switching signal or the low beam switching signal. Determine whether to light up. That is, when the high beam switching signal is input from the beam control unit 3, the high beam lighting signal is output to the headlight relay 61, and when the low beam switching signal is input from the beam control unit 3, the low beam lighting signal is output to the headlight relay 61. Output to.

  The headlight relay 61 receives the output signal of the autolight unit 4 and switches the energization state between the headlights 1L and 1R and the battery. Specifically, the headlight relay 61 energizes the left and right high beam filaments 12L and 12R with the battery when a high beam lighting signal is input from the auto light unit 4, and the left and right low beams when a low beam lighting signal is input. When the filaments 11L and 11R are energized with the battery and a turn-off signal is received, the left and right high beam filaments 12L and 12R and the left and right low beam filaments 11L and 11R are not energized with the battery.

  Next, the control of the beam control unit 3 in the headlight control device 2 configured as described above will be described with reference to the flowcharts shown in FIGS. This flow is started when the ignition is turned on.

  First, in step S1, a system self-check is performed. If there is no abnormality (NO in step S2), the process proceeds to step S3. If there is an abnormality (YES in step S2), the process proceeds to step S19.

  In step S19, the abnormality lamp is turned on by the indicator 62 to notify the driver of the failure and an abnormality signal is output to the diagnosis.

  On the other hand, if there is no system abnormality, in step S3, the position of the shift lever 13 is detected from the shift position sensor 53 to detect whether or not the host vehicle V is moving forward. Specifically, when the shift position is “D (drive)”, “S (second)”, or “L (low)” (YES), the process proceeds to step S4, while the shift position is other than that. If (NO), step S3 is repeated again.

  In step S4, the vehicle speed of the host vehicle V is detected from the vehicle speed sensor 54 to detect whether the vehicle speed is equal to or higher than a predetermined speed. When the vehicle speed is equal to or higher than the predetermined speed (YES), the process proceeds to step S5. When the vehicle speed is slower than the predetermined speed (NO), the process returns to step S3, and the flow after step S3 is repeated. The predetermined speed may be set to a speed at which it is preferable to enlarge the field of view in front of the host vehicle V using the headlights 1L and 1R as high beams. In this embodiment, it is set to 20 km / h.

  In step S5, it is determined whether or not the auto light / beam control switch 51 is "auto". When the auto light / beam control switch 51 is “auto” (YES), the process proceeds to step S6, while when the auto light / beam control switch 51 is other than “auto” (NO), the process proceeds to step S6. Returning to S3, the flow after step S3 is repeated.

  In step S6, it is detected whether or not the auto light unit 4 has determined that the headlights 1L and 1R are lit. Specifically, it is detected whether or not a lighting determination signal is input from the lighting determination unit 41 of the auto light unit 4, and when the lighting determination signal is input (YES), the process proceeds to step S7 while the extinction determination signal Is input (NO), the process returns to Step S3 and Steps S3 and after are repeated.

  In step S7, it is detected whether or not the beam switch 52 is set to “high”. When the beam switch 52 is “high” (YES), the process proceeds to step S8, while when the beam switch 52 is “low” (NO), the process returns to step S3 and steps S3 and thereafter are performed. repeat. Thus, since the beam control described later is performed only when the beam switch 52 is “high”, switching between the high beam and the low beam is performed manually while performing the automatic light control. The beam switch 52 may be operated to “low”.

  In step S <b> 8, a high beam switching signal is output from the beam control unit 32 to the auto light unit 4, and the auto light unit 4 turns on the headlights 1 </ b> L and 1 </ b> R in the high beam state via the headlight relay 61. At the same time, the indicator 62 of the meter 15 turns on the lamp indicating the high beam based on the beam state signal. Thereafter, the process proceeds to step S9.

  In step S9, the beam switching number counting unit 33 counts the number of beam switching. When the process proceeds from step S8 to step S9, since the headlights 1L and 1R are first turned on with a high beam by the beam control unit 3, the number of beam switching is zero. Then, it progresses to step S10.

  In step S10, it is determined whether or not the number of times of beam switching is a predetermined number (three times) within a predetermined time (10 seconds). When the number of beam switching per 10 seconds is 3 or more (YES), the process proceeds to step S17, while when the number of beam switching per 10 seconds is smaller than 3 (NO), the process proceeds to step S11. .

  Here, for the predetermined time of 10 seconds, first, when the headlights 1L, 1R are turned on with a high beam and beam control is started in step S8, the first time measurement is started. After the 10 seconds have elapsed, the timing is temporarily stopped, and when the headlights 1L, 1R are set from the low beam to the high beam for the first time after the timing ends (when the process proceeds from step S16 to step S9, which will be described later) Resume counting seconds. In this way, time measurement for 10 seconds, time measurement end, and time measurement restart are repeated. It should be noted that the beam switching number is reset every time the predetermined time of 10 seconds is counted, and the beam switching number is counted once when the time measurement is restarted for 10 seconds.

  When the process proceeds from step S8 to step S10 via step S9, the number of beam switching is zero, so the process proceeds to step S11.

  In step S11, it is determined whether or not the system has been normally forcibly terminated. Here, normal forced termination means, for example, when the ignition is turned off, when the auto light / beam control switch 51 is operated other than “auto”, or when the beam switch 52 is changed from “high” to “low”. When the vehicle is operated, the surroundings of the host vehicle V may become bright, and the lighting determination unit 41 of the auto light unit 4 may determine that the light is turned off. When it is forcibly terminated (YES), the process proceeds to the end. When it is not forcibly terminated (NO), the process proceeds to step S12. When the system ends normally and proceeds from step S11 to the end, the number of beam switching is reset.

  In step S12, the front vehicle detection unit 31 detects the presence of a preceding vehicle, an oncoming vehicle, and a road lighting device. In step S13, when at least one of the preceding vehicle, the oncoming vehicle, and the road lighting device is detected (YES), the process proceeds to step S14, while none of the preceding vehicle, the oncoming vehicle, or the road lighting device is detected. In (NO), the process returns to step S11 and the flow after step S11 is repeated. Thus, unless a vehicle ahead or a streetlight is detected, steps S11 to S13 are repeated, and the headlights 1L and 1R continue to be lit with a high beam.

  In step S14 in which a preceding vehicle or a streetlight is detected, a low beam switching signal is output from the beam control unit 32 to the auto light unit 4, and the auto light unit 4 passes the headlights 1L and 1R through the headlight relay 61 to the low beam. Turn on the light. At the same time, the indicator 62 of the meter 15 turns off the lamp indicating the high beam based on the beam state signal. Thereafter, the process proceeds to step S15.

  In step S15, as in step S13, it is determined whether or not at least one of a preceding vehicle, an oncoming vehicle, and a road lighting device has been detected. When at least one of the preceding vehicle, the oncoming vehicle, and the road lighting device is detected (YES), step S15 is repeated. On the other hand, when none of the preceding vehicle, the oncoming vehicle, or the streetlight is detected (NO), step S16 is performed. Proceed to Thus, in step S15, the vehicle waits for the preceding vehicle to disappear, the oncoming vehicle to pass each other, and the road illumination device to pass through the area where the headlights 1L and 1R are set to the low beam. . When the preceding vehicle disappears and the oncoming vehicle passes by or passes through the road with the road lighting device, the process proceeds to step S16.

  In step S16, a high beam switching signal is output from the beam control unit 32 to the autolight unit 4, and the autolight unit 4 turns on the headlights 1L and 1R again in the high beam state via the headlight relay 61. At the same time, the indicator 62 of the meter 15 turns on the lamp indicating the high beam based on the beam state signal.

  Thus, in the flow after step S8, the headlights 1L and 1R are basically turned on with a high beam, and when a preceding vehicle or a vehicle ahead of an oncoming vehicle or a road lighting device is detected, a beam for switching the headlights 1L and 1R to a low beam. Take control.

  Then, it returns to step S9 and repeats the flow after step S9.

  When returning from step S16 to step S9, since the headlights 1L and 1R are switched from the high beam to the low beam and then switched to the high beam again, the switching from the high beam to the low beam to the high beam is performed as described above. As long as it is performed within the time, the number of times of beam switching is added once in step S9. However, when the switching from the high beam to the low beam to the high beam is not performed within the predetermined time, as described above, the beam switching number is reset, and thus the beam switching number is counted from one time. The timing of the predetermined time is resumed.

  In this way, Steps S9 to S16 are repeated, and when the number of beam switching times exceeds a predetermined number (three times) within a predetermined time (10 seconds), the process proceeds to Step S17 as described above. The system is automatically forcibly terminated and a low beam switching signal is output from the beam control unit 32 to the auto light unit 4 to turn on the headlights 1L and 1R in the low beam state. In this way, the headlights 1L and 1R are not automatically set to a high beam by beam control. When the system is forcibly terminated, the number of beam switching is reset.

  Thereafter, in step S18, notification signals of the indicator 62 and the buzzer 63 are output to notify the passenger that the system has been forcibly terminated. Thus, the fact that the system has been forcibly terminated is displayed on the indicator 62 and the buzzer 63 is sounded to prompt the occupant to restart the beam control unit 3. The beam control unit 3 can be restarted by turning the ignition off and then on again, operating the auto light / beam control switch 51 other than “auto” and then operating it again to “auto”, or turning the beam switch 52 on. This can be done by operating “low” and then operating “high” again.

  As described above, according to the first embodiment, if the autolight unit 4 has illuminance that is better to turn on the headlights 1L, 1R based on the illuminance around the host vehicle V, the headlight 1L, If the illuminance does not require lighting of the headlights 1L and 1R, the headlights 1L and 1R are automatically turned off.

  At this time, the beam control unit 3 switches between the high beam and the low beam according to the presence or absence of the preceding vehicle, the oncoming vehicle, and the road lighting device. That is, the beam control unit 3 automatically sets the headlights 1L and 1R to a high beam when there is no preceding vehicle, oncoming vehicle, or road lighting device, while the preceding vehicle, oncoming vehicle, or road lighting device. When at least one of the lights is present, the headlights 1L and 1R are automatically set to a low beam. Thus, when there is no preceding vehicle or on a road without street lights, the headlights 1L, 1R can be made high beam to enlarge the front field of view. On the other hand, when there is a preceding vehicle, the headlights 1L, 1R are made low beam to move forward. In addition to avoiding discomfort to vehicle occupants, the headlights 1L and 1R are set to low beams on roads where the front field of view is secured brightly by streetlights, etc., and unnecessarily set to high beams for pedestrians, etc. It is possible to prevent discomfort.

  By the way, the autolight unit 4 is configured such that the headlights 1L and 1R are lit even in the daytime when the place is dark or cloudy. On the other hand, the beam control unit 3 is configured to operate at night when the tail lamp and headlight are turned on, as can be seen from the detection of the tail lamp and headlight of the vehicle ahead. Therefore, when the auto light unit 4 and the beam control unit 3 are combined as described above and both the units 3 and 4 are operated at the same time, the surrounding environment such as the sky is bright as in a daytime tunnel, for example. However, when the surroundings of the host vehicle V are dark, the beam control unit 3 operates in an unexpected daytime.

  As a result, for example, when passing through a tunnel in the daytime, when the tunnel exit is visible, the upper area UA becomes a dark scene in the tunnel in the front image by the camera 55, while the tunnel exit exists in the lower area LA. Will do. That is, the contrast between the illuminance of the upper area UA and the illuminance of the tunnel exit in the lower area LA is increased, and the tunnel exit may be determined as a preceding vehicle or an oncoming vehicle. As a result, it is easy to set the low beam despite the absence of the preceding vehicle and the oncoming vehicle. As described above, there is a case where the front vehicle cannot be detected well by the front image acquired by the camera 55. In some cases, the headlights 1L and 1R may be repeatedly switched between the high beam and the low beam in a short cycle.

  Therefore, the beam control unit 3 counts the number of beam switching times of the headlights 1L and 1R between the high beam and the low beam by the beam switching number counting unit 33, and switching between the high beam and the low beam is frequently performed. If so, the setting of the headlights 1L, 1R to the high beam by the beam control unit 3 is not performed. As a result, it is possible to prevent the driver and occupants of the preceding vehicle from feeling uncomfortable by repeatedly switching the headlights 1L and 1R between the high beam and the low beam in a short cycle.

  Further, the beam control unit 3 operates the beam control unit 32 only when the host vehicle V is moving forward based on the detection signal of the shift position sensor 53 (see step S3), so it is necessary to enlarge the front view. Therefore, it is possible to prevent unnecessary setting of the high beam when the vehicle is stopped or when the vehicle is backed. As a result, it is possible to prevent the person or vehicle ahead of the host vehicle V from feeling uncomfortable.

  Further, the beam control unit 3 operates the beam control unit 32 only when the host vehicle V is traveling at a predetermined speed (20 km / h) or more based on a detection signal from the vehicle speed sensor 54 (see step S4). Therefore, it is not necessary to enlarge the front field of view, and it is possible to prevent unnecessary high beams from being set during slow traffic such as in traffic jams or when the host vehicle V is parked and stopped. It is possible to prevent the person in front of the vehicle and the vehicle from being uncomfortable. Further, during slow driving, it is better to illuminate the vicinity of the front side of the host vehicle V brighter than far away. With the above configuration, the field of view immediately in front of the host vehicle V can be ensured bright.

<< Embodiment 2 of the Invention >>
Next, a headlight control device according to Embodiment 2 of the present invention will be described. In addition, the same code | symbol is attached | subjected about the same structure as the said Embodiment 1, and the further description is abbreviate | omitted.

  In the first embodiment, the beam control unit 3 forcibly terminates the system when the number of times of beam switching exceeds a predetermined number of times within a predetermined time. However, in the second embodiment, the number of times of beam switching is predetermined within a predetermined time. The beam control unit 32 is configured to prohibit the headlights 1L and 1R from being set to a high beam for a predetermined time when the number of times has been exceeded, and to resume normal beam control after the predetermined time has elapsed.

  This Embodiment 2 is demonstrated using the flowchart shown in FIG. The same steps as those in the first embodiment are denoted by the same reference numerals, and the flow up to step S18 is the same as that in the first embodiment.

  Specifically, in step S10, the number of times of beam switching becomes a predetermined number or more, the system is forcibly terminated in step S17 and the headlights 1L and 1R are turned on in a low beam state, and the passenger is forcibly terminated in step S18. After notifying the effect, the process proceeds to step S20. In step S20, the number of forced terminations in step S17 is counted. Then, it progresses to step S21.

  In step S21, it is determined whether or not a predetermined standby time (5 minutes in the present embodiment) has elapsed. When the predetermined standby time has elapsed (YES), the process proceeds to step S22. When the predetermined standby time has not elapsed (NO), step S21 is repeated to wait until the predetermined standby time elapses. The predetermined waiting time is such that the switching between the high beam and the low beam can be repeated in a short cycle, for example, a time sufficient to pass through a dark place such as a tunnel or a time sufficient to pass a section where the curve continues. It is set to a time that is considered highly likely.

  In step S22, it is determined whether or not the number of forced terminations within a predetermined time (30 minutes in the present embodiment) is equal to or greater than a predetermined number (5 in the present embodiment). When the number of forced terminations is smaller than the predetermined number (NO), the process proceeds to step S23. When the number of forced terminations is equal to or greater than the predetermined number (YES), the process proceeds to step S24. The predetermined time and the predetermined number of times are set to the time and the number of times that it can be determined that there is a high possibility that the system has failed.

In step S23, a high beam switching signal is output from the beam control unit 32 to the auto light unit 4, and the headlights 1L and 1R are turned on again in the high beam state. At the same time, the indicator 62 of the meter 15 turns on the lamp indicating the high beam based on the beam state signal. Then, it progresses to step S9. That means
On the other hand, in step S24, since there is a high possibility that a failure has occurred in the system, a notification signal is output to the indicator 62 and the buzzer 63 to notify the passenger of the necessity of maintenance. Then go to the end. Since the notification to the passenger in step S24 has a different meaning from the notification in step S18, the notification color in the indicator 62 and the tone or sound pattern of the buzzer 63 may be different from the notification in step S18. preferable.

  In the second embodiment, when the number of times of beam switching becomes a predetermined number (three times) or more within a predetermined time (10 seconds), the beam control unit 32 determines that the headlights 1L and 1R become high beams for a predetermined waiting time ( 5 minutes) is prohibited, and after a predetermined waiting time has elapsed (see the flow to steps S21 to S23), even if the setting to high beam is once prohibited, the occupant can Since normal beam control (refer to the flow of steps S9 to S16) is resumed without performing the restarting operation, the convenience can be improved. Also, if the forced termination within a predetermined time (30 minutes) continues for a predetermined number of times (5 times) or more, there is a high possibility that a failure has occurred, so the passenger is maintained at the service factory by the indicator 62 and the buzzer 63. It is possible to notify that there is a need to receive. It is considered that this system failure may occur due to a failure of the headlight control device 2 and its peripheral devices, for example, the optical axis of the camera 55 is deviated.

<< Other Embodiments >>
The present invention may be configured as follows for the first and second embodiments. That is, the beam control unit 3 is configured to forcibly terminate the system when the number of times of beam switching becomes three (predetermined number) or more within 10 seconds (predetermined time), but is not limited thereto. It is not a thing. That is, the predetermined time and the predetermined number of times that it can be determined that the headlights 1L and 1R are erroneously switched between the high beam and the low beam may be set.

  The beam switching number counting unit 33 counts the number of beam switching once when the headlights 1L and 1R are switched from high beam to low beam to high beam. However, the present invention is not limited to this, and the beam switching number counting unit 33 is not limited to this. The number of times of beam switching may be counted as one by switching from the high beam to the high beam.

  Further, the front vehicle detection unit 31 divides the front image from the camera 55 into an upper area UA and a lower area LA, and detects the front vehicle based on the illuminance contrast of both areas. However, the present invention is not limited to this. Instead, it may be detected by the light intensity, the brightness, or the like. It should be noted that a publicly known technique can be employed for calculating the luminous intensity, illuminance, luminance, and the like from the acquired image by the camera 55.

  Further, the forward vehicle detection unit 31 is not limited to the configuration for detecting the forward vehicle from the forward image from the camera 55, and other known techniques for automatically detecting the forward vehicle can be employed. Although there is a possibility that the preceding vehicle is erroneously detected even if the configuration is different from that of the preceding vehicle detection unit 31, the beam control unit 3 counts the number of beam switching by the beam switching number counting unit 33 and based on the number of beam switching. It is possible to prevent erroneous switching to the high beam or the low beam by determining the malfunction of the beam.

  Further, the beam control unit 32 is configured to set the headlights 1L and 1R to a low beam even when a road lighting device such as a streetlight is detected in front of the host vehicle V. However, the present invention is not limited to this. The headlights 1L and 1R may be set to a low beam when a preceding vehicle or an oncoming vehicle is detected at least in front of the host vehicle V.

  As described above, the present invention is useful for a headlight control device including the auto light control means and the high beam setting control means.

It is a block diagram which shows the headlight control apparatus which concerns on Embodiment 1 of this invention. It is the schematic of the vehicle provided with the headlight control apparatus. It is the front image of the own vehicle imaged with the camera. It is a part of flowchart figure which shows control of a headlight control apparatus. It is a part of flowchart figure which shows control of a headlight control apparatus. FIG. 10 is a part of a flowchart illustrating control of a headlight control device according to a second embodiment.

Explanation of symbols

1L left headlight (headlight)
1R Right headlight (headlight)
3 Beam control unit (high beam setting control means)
31 Front vehicle detection unit (front vehicle detection means)
33 Beam switching frequency counting section (switching frequency counting means)
4 Auto light unit (auto light control means)
55 Camera (front vehicle detection means)
56 Illuminance sensor (illuminance detection means)
62 Indicator (notification means)
63 Buzzer (notification means)

Claims (4)

  1. It is configured to be switchable between a low beam and a high beam, and a headlight that illuminates the front of the host vehicle,
    Illuminance detection means for detecting the illuminance around the host vehicle,
    Auto light control means for turning on the headlight when the illuminance detected by the illuminance detection means is below a predetermined value;
    Forward vehicle detection means for detecting a preceding vehicle or an oncoming vehicle ahead of the host vehicle;
    When neither the preceding vehicle nor the oncoming vehicle is detected by the preceding vehicle detecting means when the headlight is turned on, the headlight is set to a high beam, while the preceding vehicle detecting means sets the preceding and oncoming vehicles. High beam setting control means for setting the headlight to a low beam when at least one is detected;
    Switching number counting means for counting the number of beam switching between the high beam and the low beam of the headlight by the high beam setting control means,
    The high beam setting control means is configured not to set the headlight to a high beam when the number of beam switching counted by the switching number counting means exceeds a predetermined number within a predetermined time. A vehicle headlight control device.
  2. The vehicle headlight control device according to claim 1,
    Informing means for informing the occupant when the beam switching count counted by the switching count counting means exceeds a predetermined number of times within a predetermined time and the setting of the headlight to the high beam is not performed. A vehicle headlight device further comprising:
  3. The vehicle headlight control device according to claim 1 or 2,
    The vehicle headlight control device, wherein the high beam setting control means operates when the host vehicle is traveling forward.
  4. In the vehicle headlight control device according to any one of claims 1 to 3,
    The vehicle headlight control device, wherein the high beam setting control means operates when the vehicle speed of the host vehicle is equal to or higher than a predetermined speed.
JP2005282657A 2005-09-28 2005-09-28 Vehicle headlight control device Expired - Fee Related JP4453638B2 (en)

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CN103201137A (en) * 2010-11-24 2013-07-10 丰田自动车株式会社 Lighting device for vehicle and control method for headlamp for vehicle

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DE102006055908A1 (en) * 2006-11-27 2008-05-29 Adc Automotive Distance Control Systems Gmbh Method for automatic high beam control
JP5003593B2 (en) * 2008-05-21 2012-08-15 株式会社デンソー Light control device for vehicle and light control program for vehicle
JP5040906B2 (en) * 2008-12-26 2012-10-03 トヨタ自動車株式会社 Vehicle lighting device
JP2011255765A (en) 2010-06-08 2011-12-22 Denso Corp Headlight control device
JP5490264B2 (en) 2011-01-24 2014-05-14 本田技研工業株式会社 Light distribution control device for vehicle headlight
JP2013028274A (en) * 2011-07-28 2013-02-07 Denso Corp Headlight light control device
JP5882755B2 (en) * 2012-01-24 2016-03-09 スタンレー電気株式会社 Lighting control device for vehicle headlamp, vehicle headlamp system
CN103273872A (en) * 2013-05-28 2013-09-04 无锡同捷汽车设计有限公司 Automobile high beam and low beam automatic switchover device
FR3094458A1 (en) * 2019-03-29 2020-10-02 Psa Automobiles Sa Adaptive lighting system and method for motor vehicles
FR3094459A1 (en) * 2019-03-29 2020-10-02 Psa Automobiles Sa Adaptive lighting system and method for motor vehicles

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CN103201137A (en) * 2010-11-24 2013-07-10 丰田自动车株式会社 Lighting device for vehicle and control method for headlamp for vehicle
CN103201137B (en) * 2010-11-24 2015-09-09 丰田自动车株式会社 The control method of Vehicular illumination device and headlight for automobile

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