• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a vehicle headlight system (100) comprising a headlight unit (20), a control unit (26) which controls a change in brightness of LEDs (28) of the headlight unit and a headlight unit. memory (34) which stores information indicating a priority of an event. In a case where a second event occurs while the brightness of the LEDs (28) is gradually changed to reach the first brightness in a first period, the control unit (26) gradually changes the brightness of the LEDs (28) to reach the second brightness in a second period if the priority of the second event is greater than the priority of the first event and gradually changes the brightness of the LEDs (28) to reach the second brightness regardless of the second period if the priority of the second event is less than the priority of the first event.
    公开号:FR3040339A1
    申请号:FR1657956
    申请日:2016-08-26
    公开日:2017-03-03
    发明作者:Atsushi Uesugi；Hideki Uchida；Tatsuya Takagaki；Takuya Murakami
    申请人:Koito Manufacturing Co Ltd；Toyota Motor Corp；
    IPC主号:
    专利说明:

    VEHICLE HEADLIGHT SYSTEM
    The present invention relates to vehicle headlight systems.
    Typically, a vehicle headlight can be switched between a low beam and a high beam. The dipped beam lights a short distance at a predetermined intensity. The light distribution patterns of the low beam are regulated so as not to cause dazzle of the vehicle in front or of the vehicle in front and the low beam is used mainly when the vehicle is traveling in urban areas. In addition, the high beam illuminates a long and wide distance ahead at a relatively high intensity and is used mainly when the vehicle is traveling at high speed on a road with few vehicles in front or few vehicles in front. The high beam therefore provides better visibility for the driver than the low beam but disadvantageously causes dazzle of the driver of a vehicle in front of or a vehicle in front or pedestrian.
    [0003] In recent years, a dynamic and adaptive control technique for a traffic light distribution pattern based on the conditions surrounding a vehicle has been proposed (see, for example, JP 2008-137516). According to this technique, the presence of a vehicle in front of, a vehicle facing or a pedestrian is detected and the light emitted in a region corresponding to the detected vehicle or pedestrian is attenuated to reduce the glare of the vehicle. vehicle or pedestrian.
    In a vehicle headlight system such as that described in JP 2008-137516, when a predetermined light distribution pattern, which is switched in association with a certain event, must be switched to a distribution pattern. of different light in association with another event that occurred after the aforementioned event, the light distribution pattern is switched with the priority given to a switching time corresponding to the latest event. This may be preferable in terms of simplification of the control but leaves room for improvement in terms of comfort for the driver.
    The present invention has been made taking into account such a situation and relates to a vehicle headlight system that can improve the comfort for the driver.
    To solve the problem described above, a vehicle headlight system according to one aspect of the present invention comprises: a headlight unit combining light beams from a plurality of light emitting elements for illuminating with a light source; predetermined fire; a control unit which controls a change in brightness of the plurality of light emitting elements in accordance with at least one of an instruction from a vehicle and information indicating a driving condition; and a memory unit which stores information indicating a priority of an event causing a change in brightness of the plurality of light emitting elements. In a case where a second event occurs while the brightness of the plurality of light emitting elements is gradually changed to a first brightness in a first period corresponding to a first event, the control unit: (i) changes gradually brightness of the plurality of light emitting elements to reach the second brightness in a second period corresponding to the second event if the priority of the second event is greater than the priority of the first event; and (ii) gradually changes the brightness of the plurality of light emitting elements to reach the second brightness regardless of the second period if the priority of the second event is less than the priority of the first event.
    Embodiments will now be described by way of example only, with reference to the accompanying drawings which are exemplary, without being limiting, and in which similar elements have identical references in the multiple figures in which FIG. 1 is a flowchart of a vehicle headlight system according to one embodiment; FIG. 2 illustrates an example of a data structure of a memory unit; - Figure 3 schematically illustrates a light distribution pattern formed by a vehicle headlight; FIGS. 4A to 4E illustrate an example of brightness distribution of each partial region of a traffic light distribution pattern; and FIG. 5 illustrates an example of a change in brightness of an LED and illustrates another example of distribution.
    The invention will now be described with reference to the preferred embodiments. This is not intended to limit the scope of the present invention but to provide an example of the invention. The size of the component on each figure can be changed to help understanding. Some components may be omitted from each figure if they are not useful as part of the explanation.
    Figure 1 is a flowchart of a vehicle headlight system 100 according to one embodiment. The vehicle headlight system 100 includes a vehicle speed sensor 10, a steering angle sensor 12, a camera 14, a vehicle control unit 16 and a vehicle headlight 18.
    The vehicle speed sensor 10 detects the speed of rotation of the wheels to thereby detect the speed of the vehicle. The steering angle sensor 12 detects the steering angle of the driving wheel. The camera 14 captures an image of an area at the front of the vehicle.
    The vehicle control unit 16 controls the vehicle as a whole. The vehicle control unit 16 detects the presence of a vehicle in front of or a vehicle coming in front and the position of the detected vehicle on the basis of the image information acquired by the camera 14. On the basis of As a result of this detection, the vehicle speed information and the steering angle information, the vehicle control unit 16 determines a light distribution pattern formed by a combination of a lit region, which must be illuminated with a light beam, and an extinct region (blocked region), which should not be illuminated with a light beam. The vehicle control unit 16 transmits to the vehicle headlight 18 a pattern instruction S1 indicating the determined light distribution pattern.
    The vehicle headlight 18 forms a light distribution pattern of the road light. The current vehicle headlight 18 is equipped, in addition to a high beam, an additional high beam to illuminate a greater distance, a dipped beam, a clearance light, etc., but these are omitted here.
    The vehicle headlight 18 comprises a headlight unit 20, a semiconductor switch 22, a lighting circuit 24 and a headlight control unit 26. The current vehicle headlight system 100 is provided with a pair of 18 right and left vehicle headlights, but only one of the two is shown here.
    The headlight unit 20 comprises a plurality of semiconductor light emitting elements (for example light emitting diodes or LEDs) which can be turned on / off individually. Each LED 28 is lit when a driving current Ild is applied thereto.
    The semiconductor switch 22 is provided on a path via which current is supplied from a battery (not shown) to the lighting circuit 24 and the opening / closing of the semiconductor switch. 22 is controlled in accordance with a control signal S2 from the headlight control unit 26. The semiconductor switch 22 is closed ("on" state) when the LEDs 28 are on.
    A memory unit 34 stores the information relating to an event causing the switching of a light distribution pattern (that is to say, causing the change in brightness of an LED 28). Figure 2 illustrates an example of a data structure of the memory unit 34. The memory unit 34 stores an event 34a, a priority 34b and a gradual change time 34c associated with each other.
    The event 34a indicates an event causing the change of brightness of an LED 28. The term "switching of fire" means switching on / off a high beam, or more specifically, a switching by switching on / off by the driver or means switching on / off automatically through automatic control of high beam. The term "target detection" means the detection of a vehicle in front or of a vehicle in front. In this case, an LED 28, illuminating the vehicle in front or the vehicle coming in front, is off.
    The term "vehicle speed change" means a change in the speed of the vehicle, or more specifically, a change in the speed of the vehicle among a high speed (for example more than 80 km / h), a average speed (for example from 60 km / h to 80 km / h) and a low speed (for example less than 60 km / h). In this case, a change is made to switch to a high speed mode suitable for high speed driving, a medium speed mode suitable for medium speed driving or a low speed mode suitable for low speed driving and the light distribution pattern is correspondingly switched. The term "steering angle change" means a change in the steering angle, or more specifically, means that the steering angle has reached a predetermined value (eg 10 °), exceeded it or fell below her. In this case, the light distribution pattern is switched to illuminate the driving direction.
    The priority 34b indicates which time of gradual change should be given a higher priority when a light distribution pattern, which is switching in association with a certain event, must be switched to a distribution pattern. different light in association with another event that occurred after the aforementioned event. In this example, a smaller number indicates a higher priority. The gradual changeover time 34c indicates a switching time in which a light distribution pattern must be switched in association with each of the events, or in other words, a gradual changeover time in which the brightness of an LED 28 must be changed in association with each event.
    The headlight control unit 26 individually controls the switching on / off of the plurality of LEDs 28 on the basis of the pattern instruction S1. In the present embodiment, the headlight control unit 26 determines in which time, among the incremental change times, the brightness of each of the plurality of LEDs 28 is to be changed by referring to the memory unit 34 and generates an on / off command signal S3 controlling the switching on / off of the LEDs 28 in the determined incremental change time.
    When the headlight control unit 26 receives a pattern instruction S1 while the light distribution pattern is not being switched (the pattern instruction S1 received at this point is also called Hereinafter "first Sla pattern instruction"), the headlight control unit 26 individually controls the switching on / off of the plurality of LEDs 28 so as to switch to a light distribution pattern indicated by the first one. Sla pattern instruction (hereinafter also called "first light distribution pattern"). In particular, the headlight control unit 26, referring to the memory unit 34, determines to gradually change the brightness to reach the brightness corresponding to the first light distribution pattern (hereinafter referred to as "the first brightness In a gradual change time corresponding to an event causing switching to the first light distribution pattern (such an event is hereinafter referred to as the "first event") (such a gradual changeover time is hereinafter referred to as " First period "). In this case, the headlight control unit 26 generates, as the start / stop instruction signal S3, an on / off command signal S3a requesting the timed-up / down switch-off S3a. gradual change corresponding to the event.
    In addition, when the headlight control unit 26 receives a new SI pattern instruction in the middle of switching to a given light distribution pattern (e.g. a first light distribution pattern) (the instruction of SI pattern received at this point is also referred to hereinafter as "second Slb pattern instruction"), the headlight control unit 26 individually controls the turning off of the plurality of LEDs 28 so as to switch to a pattern of light distribution indicated by the second pattern instruction Slb (also hereinafter referred to as "second light distribution pattern"). Specifically, the headlight control unit 26 refers to the memory unit 34 and compares the priority of the first event with the priority of the event causing the switching to the second light distribution pattern (hereinafter after called "second event").
    When the priority of the second event is greater than the priority of the first event, the light control unit 26 determines to gradually change the brightness to reach the brightness corresponding to the second light distribution pattern (hereinafter called " second brightness ") in a gradual change time corresponding to the second event (hereinafter referred to as" second period "). In this case, the headlight control unit 26 generates, as the start / stop instruction signal S3, an on / off command signal S3a controlling the ignition / extinguishing over time. of gradual change corresponding to the event. On the other hand, when the priority of the first event is greater than the priority of the second event, the lighthead control unit 26 determines to gradually change the brightness to reach the second brightness regardless of the second period. In the present embodiment, the headlight control unit 26 determines to gradually change the brightness to reach the second brightness in the time remaining in the first period. In this case, the headlight control unit 26 generates, as the start / stop instruction signal S3, an on / off command signal S3b requesting ignition / extinguishing in a time. not depending on the gradual change time corresponding to the event.
    The lighting circuit 24 comprises the control circuits 30 and the gradual change controllers 32 provided for the LEDs 28 respectively. The control circuits 30 bring to the LEDs 28 the driving currents Ild corresponding to the respective light control signals S4. Each driver circuit 30 can perform both an analog light control by adjusting the amount of driving current Ild and the pulse width modulation (PWM) control by varying the cyclic ratio of the driving current Ild by switching the driving current Ild at high speed or can perform only one of the two.
    Each gradual change controller 32 generates a light control signal S4 gradually changing over time according to an on / off command signal S3 emanating from the headlight control unit 26. In particular when the brightness is to be decreased, the gradual change controller 32 smoothly varies the light control signal S4 in a direction in which the driving current Ild decreases. On the other hand, when the brightness is to be increased, the gradual change controller 32 smoothly varies the light control signal S4 in a direction in which the driving current Ild increases.
    Figure 3 schematically illustrates a light distribution pattern formed by the vehicle headlight system 100 configured as described above. Figure 3 illustrates a light distribution pattern formed on a virtual vertical screen disposed in a predetermined position in front of the headlight, for example, in a position 25 meters ahead of the headlight.
    A light distribution pattern PH is a road light distribution pattern formed by the illumination light of the headlight unit 20. The light distribution pattern PH is divided into a plurality of (FIG. here eight) partial regions PHa to PHh and the partial regions correspond to the respective LEDs 28. In other words, the vehicle headlamp 18 can form, in a zone situated at the front of the vehicle, the road fire light distribution pattern PH consisting of the plurality of partial regions PHa to PHh corresponding to the regions of the vehicle. lighting of the respective LEDs 28.
    FIGS. 4A and 4B illustrate an example of brightness distribution of each of the partial regions PHa to PHh of the light distribution pattern PH. The longer a given bar is, the greater the brightness of its corresponding partial region (ie the longer a given bar is, the higher the brightness of the LED 28 illuminating the corresponding partial region is high). FIG. 4A illustrates an exemplary light distribution distribution of the partial regions PHa to PHh of the PH light distribution pattern formed when the high beam has been switched from a switched on state to an off state during medium speed driving, or in other words, when a "fire switching" event has occurred. FIG. 4B illustrates an exemplary light distribution distribution of the partial regions PHa-PHh of the light distribution pattern PH formed when a vehicle in front or a vehicle opposite has been detected, or in other words, when a "target detection" event has occurred. This example illustrates a case in which a vehicle in front or a vehicle in front was detected in the partial regions PHd and PHe. FIGS. 4C and 4D illustrate examples of brightness distribution of the partial regions PHa-PHh of the PH light distribution pattern formed when the vehicle speed has changed from the medium speed line to the low speed line and when the speed of the vehicle has changed. vehicle changed from driving at medium speed to driving at high speed, respectively, or in other words, when a "vehicle shift" event occurred. FIG. 4E illustrates an example of brightness distribution of partial regions PHa to PHh of the PH light distribution pattern formed when the drive wheel is turned to the left, or in other words, when a "change of angle" event steering "has occurred. As illustrated in FIGS. 4A-4E, when an event occurs, the light distribution pattern is switched in accordance with this event and the brightness of a partial region (i.e. an LED 28 illuminating the partial region) changes.
    FIG. 5 illustrates an example of a change in brightness of an LED 28 illuminating a given partial region. In Figure 5, the horizontal axis represents the time and the vertical axis represents the brightness. FIG. 5 illustrates a case in which the light distribution pattern is switched in case of a steering angle change serving as a second event occurring in the middle of the switching of the light distribution pattern in association with the switching of the light distribution pattern. the light serving as the first event (at the same time as the brightness of the LED 28 is switched).
    On receipt of a first pattern instruction Sla indicating a switch to the first light distribution pattern in association with the occurrence of the fire switching, the light control unit 26 generates an instruction signal. switching on / off S3a gradually changing the brightness to reach the target brightness in a gradual change time (700 ms (milliseconds)) corresponding to the switching of fire. On the basis of this on / off command signal S3a, the gradual change controller 32 generates a light control signal S4 which changes, in 700 ms, in a direction in which the driving current Ild increases. . The control circuit 30 supplies the driving current Ild corresponding to this light control signal S4 to the LED 28 and gradually increases the brightness of the LED 28.
    Upon receipt of a second pattern instruction Slb indicating switching to the second light distribution pattern in association with the occurrence of the steering angle change, the headlight control unit 26 refers to the memory unit 34 and checks the priorities of the fire switch and the change of steering angle. In the present embodiment, the headlight control unit 26 determines that the priority of the fire switch which is the event that occurred previously is greater than the steering angle change priority which is the event that occurred later (see Figure 2).
    This is why the headlight control unit 26 generates an on / off instruction signal S3b gradually changing the brightness to reach the target brightness of the second light distribution pattern in the time remaining in the gradual changeover time (700 ms) corresponding to the switching of the fire regardless of the time of gradual change (200 ms) corresponding to the change of steering angle. For example, if the steering angle change occurs when 300 ms have elapsed since the occurrence of the fire switching, the headlight control unit 26 generates an on / off command signal S3b gradually changing the brightness to reach the target brightness of the second light distribution pattern in the remaining 400 (= 700 - 300) ms.
    On the basis of the start / stop instruction signal S3b, the gradual change controller 32 generates a light control signal S4 which changes, in 400 ms, in a direction in which the driving current Ild increases. The control circuit 30 supplies the driving current Ild corresponding to this new light control signal S4 to the LED 28 and gradually increases the brightness of the LED 28.
    With the vehicle headlight system 100 according to the embodiment described above, when the priority of the second event is lower than the priority of the first event, the brightness of the LED 28 is gradually changed to reach the target brightness regardless of the second period. In other words, when the priority of the event that occurred later is lower than the priority of the event that occurred before, the brightness of the LED 28 is gradually changed independently of the time corresponding to the event that occurred later. Therefore, by appropriately setting the priorities, a brightness change associated with an event with a higher priority can be realized in a desired period of time regardless of the event that occurred later.
    Hitherto, the present invention has been described on the basis of one embodiment. This embodiment, however, is illustrative only and those skilled in the art will appreciate that various modifications may be made to the combinations of elements and processes of the embodiment and that such modifications are also within the scope of the present invention. . Such modifications will be described below.
    [0036] (First modification) In the embodiment, a case in which the brightness is gradually changed to reach the second brightness in the time remaining in the first period if the priority of the first event is greater than the priority of the second event a has been described, but it is not a limiting example. When a predetermined condition is satisfied, even if the priority of the second event is lower than the priority of the first event, the brightness may be gradually changed to reach the second brightness in the second period if the time remaining in the first period is shorter than the second period. In this case, a quick change in the brightness of an LED can be suppressed. Examples of the predetermined condition include a case in which the first event is an event at which the LEDs of the plurality of LEDs 28, while they are all off, are on (ie, switching). of fire) and the second event is the change of steering angle. When the LEDs 28 which are all off are lit, if the brightness of all the LEDs 28 changes rapidly, the driver may feel discomfort, but this can be removed by the modification.
    The present invention has been described on the basis of embodiments with the use of specific terms, but the embodiments merely illustrate the principle and applications of the present invention and a number of modifications of the embodiments. and changes in arrangement may be made within the scope of the present invention without departing from the spirit set forth in the claims.
    A vehicle headlight system according to one aspect of the present invention comprises a headlight unit combining the light beams from a plurality of light emitting elements for illuminating with a predetermined light, a control unit which controls a light. changing the brightness of the plurality of light emitting elements according to at least one of an instruction from a vehicle and information indicating a driving condition and a memory unit which stores information indicating a priority of an event causing the change in brightness of the plurality of light emitting elements. In a case where a second event occurs while the brightness of the plurality of light emitting elements is gradually changed to reach the first brightness in a first period corresponding to a first event, the control unit (i) changes gradually. the brightness of the plurality of light emitting elements to reach the second brightness in a second period corresponding to the second event if the priority of the second event is greater than the priority of the first event and (ii) gradually changes the brightness of the plurality of light emitting elements for reaching the second brightness regardless of the second period if the priority of the second event is lower than the priority of the first event.
    In this aspect, when the priority of an event that occurred later is less than the priority of an event that occurred previously, the brightness of the electroluminescent element is gradually changed independently of the corresponding time. to the event that occurred later. Therefore, by prioritizing appropriately, a brightness change associated with an event with higher priority can be achieved in a desired time period regardless of an event that occurred later.
    The control unit may gradually change the brightness of the plurality of light emitting elements to reach the second brightness in a time remaining in the first period if the priority of the second event is less than the priority of the first event.
    When a predetermined condition is fulfilled, even if the priority of the second event is lower than the priority of the first event, the control unit can gradually change the brightness of the plurality of light emitting elements to reach the second brightness in the second period if a time remaining in the first period is shorter than the second period. This configuration makes it possible to eliminate a rapid change in the brightness of the light emitting elements.
    The predetermined condition may be that the first event is an event at which all elements of the plurality of light emitting elements are on while they are all off.
    权利要求:
    Claims (4)
    [1" id="c-fr-0001]
    A vehicle headlight system (100), comprising: a headlight unit (20) combining light beams from a plurality of light emitting elements (28) for illuminating with a predetermined light; a control unit (26) which controls a change in brightness of the plurality of light emitting elements (28) in accordance with at least one of an instruction from a vehicle and information indicating a driving condition; and a memory unit (34) which stores information indicative of a priority of an event causing a change in brightness of the plurality of light emitting elements (28), wherein, in a case where a second event occurs while that the brightness of the plurality of light emitting elements (28) is gradually changed to a first brightness in a first period corresponding to a first event, the control unit (26): (i) gradually changes the brightness of the plurality of light emitting elements (28) for attaining the second brightness in a second period corresponding to the second event if the priority of the second event is greater than the priority of the first event; and (ii) gradually changes the brightness of the plurality of light emitting elements (28) to reach the second brightness regardless of the second period if the priority of the second event is less than the priority of the first event.
    [2" id="c-fr-0002]
    The vehicle headlight system (100) according to claim 1, wherein the control unit (26) gradually changes the brightness of the plurality of light emitting elements (28) to reach the second brightness in a time remaining in the first period if the priority of the second event is less than the priority of the first event.
    [3" id="c-fr-0003]
    The vehicle headlight system (100) according to claim 1 or 2, wherein, when a predetermined condition is fulfilled, even if the priority of the second event is lower than the priority of the first event, the control unit ( 26) gradually changes the brightness of the plurality of light emitting elements (28) to the second brightness in the second period if a time remaining in the first period is shorter than the second period.
    [4" id="c-fr-0004]
    The vehicle headlight system (100) according to claim 3, wherein, the predetermined condition is that the first event is an event at which the elements of the plurality of light emitting elements (28) are ignited then that they were all extinct.
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    同族专利:
    公开号 | 公开日
    US20170057403A1|2017-03-02|
    JP2017043244A|2017-03-02|
    JP6211569B2|2017-10-11|
    CN106476677A|2017-03-08|
    CN106476677B|2019-03-01|
    FR3040339B1|2019-05-17|
    US9656596B2|2017-05-23|
    DE102016115583A1|2017-03-02|
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    法律状态:
    2017-07-14| PLFP| Fee payment|Year of fee payment: 2 |
    2018-06-01| PLSC| Publication of the preliminary search report|Effective date: 20180601 |
    2018-07-12| PLFP| Fee payment|Year of fee payment: 3 |
    2020-07-15| PLFP| Fee payment|Year of fee payment: 5 |
    2021-07-15| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2015167922A|JP6211569B2|2015-08-27|2015-08-27|Vehicle lighting system|
    JP2015-167922|2015-08-27|
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