Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
  • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
  • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
  • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
  • B60Q1/06—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle
  • B60Q1/08—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically
  • B60Q1/12—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically due to steering position
  • B60Q1/122—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically due to steering position with electrical actuating means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
  • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
  • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
  • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
  • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
  • B60Q1/1415—Dimming circuits
  • B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
  • H05B47/10—Controlling the light source
  • H05B47/155—Coordinated control of two or more light sources
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
  • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
  • B60Q2300/10—Indexing codes relating to particular vehicle conditions
  • B60Q2300/12—Steering parameters
  • B60Q2300/122—Steering angle
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
  • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
  • F21W2102/10—Arrangement or contour of the emitted light
  • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
  • F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
  • F21W2102/155—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions having inclined and horizontal cutoff lines

Definitions

• Light system for a motor vehicle The present invention relates to the field of motor vehicle lighting, and more particularly to directional lighting functions making it possible to illuminate the inside of a bend.
• Motor vehicles are equipped with projectors, or headlights, intended to illuminate the road in front of the vehicle, at night or in the event of reduced light.
• These headlamps comprise one or more light modules which are controlled to generate two lighting modes, a first “main beam” mode and a second “dipped beam” mode.
• the "main beam” mode makes it possible to illuminate the road in front of the vehicle with high light intensity as well as the verges in a satisfactory manner when the road is straight.
• the "dipped beam” mode illuminates the road in front of the vehicle with a lower light intensity, but still offering good visibility, without dazzling other road users.
• these are in “dipped beam” mode so as not to dazzle other road users.
• the light beams projected in one or other of the lighting modes, and in particular in the "dipped beam” mode may not allow sufficiently illuminate the shoulder on the inside of the bend so that the driver of the vehicle can protect himself from potential danger. It is known to split the lighting beam of a dipped headlight into a wide cut-off lighting zone, forming a lower part of the beam known as the “flat” and aiming to illuminate the road scene in a wide manner.
• This focused lighting zone has in particular a cut-off edge, substantially perpendicular to the horizontal cut-off of the "flat” part or inclined with respect to this horizontal cut-off, which laterally delimits the "kink” part on the side of the driver and of the vehicles. likely to travel on a lane in the opposite direction to that in which the vehicle is traveling.
• the headlights of the vehicle so that they can fulfill a function of directional lighting also known under the name "DBL", acronym for "Dynamic Bending Light” in English, by moving angularly the light beam emitted as a function of the angle at the steering wheel to ensure optimum lighting of the roadside when the vehicle's trajectory changes. It is in particular known to perform such a directional lighting function mechanically by pivoting the entire module generating the dipped beam or the main beam on the left or on the right depending on the direction of the bend. Thus, when a vehicle equipped with a directional lighting function takes a bend, the whole of the light beam forming the dipped beam is caused to pivot, towards the inside of the bend.
• DBL Dynamic Bending Light
• a light module comprises a plurality of light sources participating in generating beam portions forming pixels of the overall light beam emitted, it may be decided to perform the directional lighting function digitally, by activating or deactivating the light sources to direct the light beam without pivoting the module.
• a control law is configured to control the activation and deactivation of the light sources to modify the extent and the angular orientation of the light beams thus formed at the output of the headlights.
• the previously mentioned focused lighting zone, or “kink” part can be generated by high-definition light sources, that is to say with a greater definition than that of the sources associated with the lighting zone at wide cut-off, so that the wide cut-off lighting zone can be defined as a diffuse lighting zone.
• the combination of a digital directional lighting beam and a focused lighting area generated by high definition light sources, limiting the angular extent of this focused lighting area forming the "kink" part, can generate , during the angular pivoting of the light beams generated by the headlamps and in particular for pivoting during a turn on the side opposite the driver, a discontinuity in the illumination beam of the road at the level of the focused illumination zone which may represent an inconvenience for the driver.
• the present invention proposes to solve these various constraints, and in particular the discontinuity of the lighting beam, by means of a lighting system for a motor vehicle comprising a first headlamp intended to be mounted on a first side of the motor vehicle and capable of projecting a first light beam and a second headlamp intended to be mounted on a second side of the motor vehicle and capable of projecting a second light beam, the first and second light beams being complementary to form a beam for illuminating a road, the beam lighting being controlled by a control law, each projector comprising means for projecting a wide light beam with cut-off and means for pixelated projection of a focused light beam, at least the pixelated means for projecting comprising a plurality of selectively activatable light sources, the first light beam being formed by a first focused light beam having a first optical axis and a first wide cut-off light beam, the second light beam being formed by a second focused light beam having a second optical axis and a second wide cut-off light beam, at least the first focused
• the control law is configured to generate an asymmetry, with respect to a central longitudinal axis of the light system according to the invention, between the angular displacement of the first focused light beam from the first outer end position to the first inner end position and the angular displacement of the second focused light beam from the second outer end position to the second inner end position.
• the digital directional lighting function implemented by pixelated projection means within motor vehicle headlights, is driven by a control law implemented in vehicle control units. This control law makes it possible to control the orientation of the first and second focused light beams by activating or deactivating the light sources which make it possible to generate these focused light beams.
• the displacement of the first focused light beam is controlled so that the angular range of numerical pivoting of the first focused light beams is different from that relating to the displacement of the second focused light beam during a change of trajectory of the motor vehicle in a bend oriented towards the first side, that is to say from the driver's side.
• This asymmetry makes it possible to prevent the first inner end position of the first pixelated light beam and the second outer end of the second pixelated light beam from being too far from each other in the second position of the lighting beam during a bend oriented towards the second side, so that the driver of the motor vehicle observes, during changes of direction and during a corresponding pivoting of the lighting beam, a substantially continuous focused light beam formed from the first and second beams focused light.
• These angular end positions specific to each pixelized light beam are defined with respect to an optical axis specific to the projector configured to project said pixelized light beam.
• the optical axis is defined by the nominal orientation of the beam, for lighting a straight road, that is to say in the absence of information on a bend.
• each headlight is configured so that the corresponding optical axis is substantially parallel to an axis central longitudinal axis of the lighting system on either side of which the two headlamps are arranged, this central longitudinal axis of the lighting system possibly being coincident with the median longitudinal axis of the vehicle.
• the optical axis is for example located at the level of the light source(s) of the headlight. It can in particular bear against the center of the plurality of selectively activatable light sources.
• the lighting system may have one or more of the following characteristics, taken alone or in combination.
• the wide cut-off beam has a substantially rectilinear cut-off, in particular a horizontal cut-off, when the respective headlamp of the lighting system is in its normal position of use.
• the horizontal cutoffs of the first and second cutoff wide beams are aligned to form an overall horizontal cutoff.
• the wide cutoff beam may according to the invention consist of a diffuse beam or of a pixelated beam, but it should be noted that this wide cutoff beam if it is pixelated has a low resolution, for example with pixels of a dimension such that their angular field is greater than 5°.
• the need for a modification of the control law is more particularly useful for the focused light beam ensuring the illumination of the road scene above the horizontal cut-off of the wide-cut beam, insofar as the projection means associated pixels have a higher resolution with pixels whose angular field is less than 2° or 3° and therefore insofar as the focused light beam has a narrowed illumination field.
• Each of the focused light beams has a cut-off edge, which can be inclined with respect to the corresponding optical axis of the projector and the angular position of the focused light beam is defined by the position of this cut-off edge with respect to the corresponding optical axis .
• Each of the focused light beams has a cut-off edge, which can be inclined with respect to the cut-off of the corresponding cut-off wide beam of the headlamp and the angular position of the focused light beam is defined by the position of this cut-off edge, in particular by the position of the intersection of this cut-off edge with the cut-off of the corresponding cut-off wide beam, with respect to the corresponding optical axis.
• the same characteristic can also apply to a cut-off edge inclined with respect to the cut-off. corresponding cut-off wide beam of the headlamp, and vice versa.
• the asymmetry generated by the control law is operated by a specific command intended for at least one of means projecting the first focused light beam and means projecting the second focused light beam.
• the specific control can also consist of an interruption of the angular pivoting, which is carried out by the control law by freezing the activations and deactivations of the light sources associated with the headlamp which it is intended to control digitally, only by interrupting the lighting function exercised by the corresponding projector by deactivating all the light sources of the pixelated projection means of this projector.
• the specific command generated by the control law intervenes when a defined angle value of a focused light beam is reached.
• the first focused light beam has a first beam width defined between a first cutting edge forming an edge of the first focused light beam and a first fixed end
• the second focused light beam having a second width beam defined between a second cutting edge forming an edge of the second focused light beam and a second fixed end
• the first and second beamwidths varying according to the number of activated light sources, the first beamwidth and the second beamwidth varying independently of each other as the first focused light beam and the second focused light beam move between the first position and the second position of the illuminating beam.
• the beamwidth of the first and second focused light beams is defined by the distance between, respectively, the first cutting edge and the first fixed end and the second cutting edge and the second fixed end of the first and second light beams focused for example when they are projected on a vertical surface 25 meters from the vehicle.
• the number of light sources of the pixelated projection means activated by the control law to generate each of the focused light beams varies according to information relating to a change in direction of the motor vehicle. This information relating to the change of direction can come, for example, from the angular position at the steering wheel or from the drift angle of the vehicle.
• control law is configured to activate or deactivate the light sources of at least one of the pixelated projection means, the angular displacement of the corresponding focused light beam being achieved by modifying step by step the light sources on and off.
• the orientation of the first and second focused light beams is thus controlled digitally by the control law, by activation and/or deactivation of certain light sources.
• the control law is configured to steer the illumination beam such that the intersection of the first cutoff edge of the first focused light beam with the cutoff of the first wide cutoff light beam moves from the first outer end position to the first position inner end and such that the intersection of the second cutoff edge of the second focused light beam with the cutoff of the second wide cutoff light beam moves from the second inner end position to the second outer end position .
• the control law is configured to drive the illuminating beam such that the intersection of the first cutoff edge of the first focused light beam with the cutoff of the first cutoff wide light beam moves from the first outer end position to the first inner end position and such that the intersection of the second cutoff edge of the second focused light beam with the cutoff of the second wide cutoff light beam moves from the second end position inner to the second outer end position.
• the angular displacement between the first outer end position and the first optical axis is greater than the angular displacement between the second outer end position and the second optical axis which is greater than or equal to the angular displacement between the second inner end position and the second optical axis, the angular displacement between the first inner end position and the first optical axis being substantially equal to the angular displacement between the second inner end position and the second optical axis.
• the angular displacement between the first outer end position and the first optical axis is 15°
• the angular displacement between the second outer end position and the second optical axis is 9°
• the angular displacement between the second inner end position and the second optical axis is 6°
• the angular displacement between the first inner end position and the first optical axis also being 6°.
• the control law is configured to drive the lighting beam in such a way that the first cutting edge of the first focused light beam can move on either side of a central longitudinal axis of the light system extending equidistant from the two headlamps, from a first outer end position offset by 15° from the first side to a first inner end position offset by 6° from the second side, and the second cut-off edge of the second focused light beam can move on either side of this central longitudinal axis of the light system, from a second inner end position offset by 6° from the first side to a second outer end position offset by 9 ° on the second side of the motor vehicle.
• the angles are measured relative to the position of the focused light beam, and for example of the corresponding cut-off edge, relative to each of the optical axes specific to the headlamp associated with this focused light beam.
• the indicated angle value is specified with the side on which the angle is located.
• the angular displacement between the first outer end position and the first optical axis is greater than the angular displacement between the second outer end position and the second optical axis, than the angular displacement between the second inner end position and the second optical axis and to the angular displacement between the first inner end position and the first optical axis, these last three angular displacements being substantially equal.
• the angular displacement between the first outer end position and the first optical axis is 15°
• the angular displacement between the second outer end position and the second optical axis is 15°
• the angular displacement between the second inner end position and the second optical axis is 15°
• the angular displacement between the second inner end position and the second optical axis is 15°
• the angular displacement between the second inner end position and the second optical axis is all three 6°.
• the control law of the lighting beam is configured to drive the lighting beam in such a way that the first cutting edge of the first focused light beam can move on either side of the central longitudinal axis of the lighting system extending equidistant from the two headlamps, from a first outer end position offset by 15° from the first side to a first inner end position offset by 6° from the second side, and the second cutting edge of the second focused light beam can move on either side of the central longitudinal axis of the light system, from a second inner end position offset by 6° from the first side to a second position d outer end offset by 6° from the second side of the motor vehicle.
• the lighting beam control law interrupts on the one hand the angular pivoting of the first focused light beam when the first cut-off edge reaches the first inner end position shifted by 6° by relative to the central longitudinal axis of the lighting system, the second side, and on the other hand the angular pivoting of the second focused light beam when the second cut-off edge reaches the second outer end position offset by 9° or 6°, with respect to the central longitudinal axis of the light system, on the second side.
• the lighting beam control law interrupts on the one hand the movement of the first focused light beam when the first cut-off edge reaches the first inner end position shifted by a first determined value with respect to the first optical axis and on the other hand the displacement of the second focused light beam when the second cutting edge reaches the second outer end position shifted by a second determined value with respect to the second optical axis, the second value being equal to or less than 3° above the first value.
• the lighting beam control law firstly interrupts the displacement of the first focused light beam when the first cut-off edge reaches the first inner end position shifted by a first determined value and secondly moving the second focused light beam when the second cut-off edge reaches the second outer end position shifted by a second determined value.
• the lighting beam control law is configured to deactivate all of the light sources of the pixelated projection means of the first projector when the first cutting edge of the first focused light beam reaches the first position inner end.
• the second focused light beam has a higher light intensity when the light sources of the pixelated projection means of the first projector are deactivated.
• the lighting beam control law is configured to progressively deactivate the light sources of the pixelated projection means of the first projector, the deactivation beginning when the first cutting edge of the first focused light beam reaches a position offset by an angle R1 before the first inner end position, the deactivation being complete when the first cutting edge of the first focused light beam reaches the first inner end position.
• the lighting beam control law is configured to gradually increase the light intensity of the second focused light beam when the light sources of the pixelated projection means of the first projector are progressively deactivated.
• the start of the increase is synchronized with the start of the previously mentioned deactivation.
• the increase is complete, that is to say it compensates for the deactivation so that the overall light intensity of the lighting beam remains substantially constant, when the first cutting edge of the first focused light beam reaches the first inside end position.
• gradually increasing it is understood here that the luminous flux of each light source increases, following a continuously increasing function.
• the continuously increasing function is a function of the angle of the position of the second cutting edge of the second focused light beam.
• the deactivation and the increase are such that the overall light intensity of the lighting beam remains substantially constant throughout the progressive evolution of the respective light fluxes and/or intensities of the first and second light beams .
• R1 has a value between 2 and 4°. These values make it possible to ensure a sufficiently smooth transition, and have the advantage of minimizing the time during which the light intensity of the second focused light beam is increased. A higher value of R1 would lead to an increase in the heating of the light sources, which would be detrimental to their correct operation, and could even lead to their destruction.
• FIG.1 schematically represents a motor vehicle equipped with the lighting system
• FIG.2 schematically represents a light beam emitted by two headlights of the motor vehicle of Figure 1
• FIG.3 schematically represents the lighting beam projected onto a vertical surface at a distance from the vehicle and in which the position of a first cutting edge of the beam emitted by a first projector is at the level of a first outer end and the position of a second cutting edge of the beam emitted by a second projector is at a second inner end
• FIG.4 graphically represents the angular displacement of the first and second cut-off edges according to one embodiment of the control law controlling the lighting system according to the invention
• FIG.5 schematically represents the illuminating beam projected onto a vertical surface in which the position of the first cut-off edge is at the level of the first outer end and the position of the second cut-off edge is at the level of the second outer end according to the embodiment of the control law of FIG.
• FIG.6 graphically represents the angular displacement of the first and of the second cut-off edge according to another embodiment of the control law
• FIG.7 schematically represents the illuminating beam projected onto a vertical surface in which the position of the first cut-off edge is at the level of the first inner end and the position of the second cut-off edge is at the level of the second outer end according to the embodiment of the control law of FIG. 6
• FIG.8 graphically represents the angular displacement of the first and second cut-off edges according to another embodiment of the control law
• FIG.9 graphically represents the change in intensity of the first and second focused light beams according to the embodiment of the control law of FIG. 8.
• Figure 1 illustrates a motor vehicle 1 equipped with a light system according to the invention.
• the motor vehicle 1 has a median longitudinal axis 100 extending parallel to the main direction of the motor vehicle 1 and separating the motor vehicle 1 into a first side 11 and a second side 12, substantially equal.
• the first side 11 is systematically the side of the motor vehicle 1 corresponding to the side where the driver of the motor vehicle 1 is installed.
• the first side is the left side, depending on the direction of movement in forward motion of the motor vehicle.
• the first side is the right side, depending on the direction of movement in the forward direction of the motor vehicle.
• the first side 11 of the motor vehicle 1 is the left side, in the direction of forward travel, of the motor vehicle 1, but it should be noted that the description relating to this first side 11 applies mutatis mutandis whether it is the right side or the left side of the motor vehicle 1.
• the motor vehicle 1 is equipped with a lighting system according to the invention comprising at least one first headlamp 111, disposed on the first side 11 and capable of projecting a first light beam 21, and a second projector 121, disposed on the second side 12 and capable of projecting a second light beam 22.
• the projectors are arranged on either side of a central longitudinal axis of the light system, which may in particular coincide with the median longitudinal axis 100 of the motor vehicle.
• the first light beam 21 and the second light beam 22 are complementary to generate a lighting beam 2. This lighting beam 2 makes it possible to illuminate the road on which the motor vehicle 1 is traveling, for example to guarantee traffic conditions optimal, especially at night, or to be visible to other drivers.
• Each of the first and second projectors 111 and 121 comprises means for projecting a wide cut-off light beam and means for pixelated projection of a focused light beam, the combination of the wide cut-off light beam and the focused light beam projected by the first projector 111 participating in generating the first light beam 21 while the combination of the wide cut-off light beam and the focused light beam projected by the second projector 121 participates in generating the second light beam 22.
• each light beam is formed of the wide cut-off light beam, which presents a wide field of illumination directly projected onto the road scene in front of the vehicle and which presents a horizontal cut-off, and of the focused light beam, which has a reduced illumination field in the extension of the horizontal cut-off, of smaller width than that of the illumination field of the wide cut-off light beam, in particular to ensure high definition of the focused light beam.
• the wide cut-off light beam may, in an alternative embodiment, also be pixelated.
• the focused light beam is distinguished in this case with a higher resolution than that of the wide cut-off light beam and an illumination field of each pixel narrower than that associated with the wide cut-off light beam.
• the illumination field of each pixel generating the wide cut-off light beam can be of the order of 5° minimum while the illumination field of the pixels generating the focused light beam is less than 3°.
• the pixelated projection means is provided with a plurality of selectively activatable light sources, each light source producing a light ray constituting the focused light beam. It is understood that the focused light beam is formed of a plurality of light beams equal in number to the number of light sources producing a light beam, that is to say activated.
• the pixelated projection means comprises at least 20,000 light sources, this large number of light sources making it possible to project a very high resolution pixelated light beam.
• Each of the light sources, and in particular the light sources participating in generating the focused light beam, is able to be activated or deactivated via a control law, to generate or not one of the light rays.
• This control law allows the pixelated projection means to project a focused light beam able to move angularly.
• the control law making it possible to manage the angular displacement of at least each of the focused light beams makes it possible to ensure a directional lighting function which makes it possible to orient the lighting beam 2 between a first position and a second position, according to information relating, for example, to the change of direction of the motor vehicle 1, or else to the angle at the steering wheel.
• FIG. 2 illustrates two pixelated projection means 3 and 4 located, when they are installed in the motor vehicle 1, respectively in the first projector 111 and in the second projector 121. These two pixelated projection means 3 and 4 respectively generate a first focused light beam 31 and a second focused light beam 41, which in the embodiment shown in Figure 2 are projected onto a vertical surface 5 to 25m from the vehicle to schematically illustrate the lighting beam as it would be projected on the road in front of a vehicle equipped with such pixelated projection means.
• the line H extending transversely represents the horizon line below which the wide cut-off light beam is projected by projection means not shown here and which substantially corresponds to the horizontal cut-off of the wide cut-off light beam.
• the median longitudinal axis 100 of the motor vehicle 1 is represented here schematically, substantially at the center of the vertical surface 5 and it should be noted that in a standard position of the vehicle as illustrated in FIG. say not implementing a directional lighting function, the focused light beams participate in generating a lighting beam extending equivalently to the left and to the right of the median longitudinal axis 100.
• the lighting system is adjusted so that the first and second light beams projected on the road merge at infinity but that these beams have a transverse offset with respect to each other when they are projected on a vertical surface 5 to 25 meters, due to the transverse spacing of the headlights on the vehicle.
• the angular positioning of the light beams is relative to the optical axis of the headlamp which corresponds thereto.
• the first focused light beam 31 generated by the pixelated projection means of the first projector extends on either side of a first optical axis 30 associated with this first projector.
• the first focused light beam 31 extends transversely between an end forming a first cutting edge 310 and a first fixed end 311, which is here adjusted to be positioned at 8° from the first optical axis of the second side 12, while the second light beam extends transversely between an end forming a second cutting edge 410 and a second fixed end 411, which is here adjusted to be positioned at 15° from the second optical axis of the second side 12.
• the first light beam focused has a first beam width defined between the first cutting edge 310 and the first fixed end 311, while the second focused light beam has a second beam width defined between the second cutting edge 410 and the second fixed end 411.
• the fixed ends 311, 411 are fixed with respect to the optical axis corresponding to each projector, in particular due to the production in high definition of the pixelated function, that is to say with a defined number of light sources on a given angular range. It follows from this that the width of these pixelated beams is caused to vary as a function of the position of the cut relative to the corresponding fixed end.
• These first and second cutting edges 310 and 410 form the edge of the corresponding focused light beam oriented towards the first side 11 of the vehicle, with an inclination relative to the optical axis of the corresponding headlamp which contributes to not dazzling uses of the road coming in the opposite direction of the vehicle equipped with the headlights according to the invention.
• first and second cut-off edges 310 and 410 have an inclination relative to the cut-off of the corresponding cut-off wide light beam.
• the control law makes it possible to modify the orientation of the first and second focused light beams 31 and 41 by activating or deactivating the light sources so as to move these first and second cut-off edges 310 and 410 transversely.
• the control law thus makes it possible to modulate the position of the first cut edge 310 between a first outer end position P1ext and a first inner end position P1int, and the position of the second cut edge 410 between a second inner end position P2int and a second outer end position P2ext.
• the inner end position P1int, P2int of the cut-off of this focused light beam must be understood as the end position facing the other pixelated projection means , that is to say towards the interior of the vehicle, while the outer end position P1ext, P2ext of the cut-off of this focused light beam must be understood as the end position facing away from the other means of pixelated projection, that is to say towards the outside of the vehicle.
• FIG. 3 more precisely illustrates the illuminating beam 2 projected onto the vertical surface 5.
• This vertical surface 5 here has a marking making it possible to determine the angular position of the first and second cutting edges 310, 410 of the pixelated light beams projected onto the vertical surface 5, with respect to the optical axis of each of the projectors intended to project these beams.
• the lighting beam 2 as it is here projected on the vertical surface 5 has a first wide light beam with cut-off 200 and a second wide light beam with cut-off 201, which form a wide part of the beam, commonly called “flat”. , and intended to illuminate the road scene in direct proximity to the vehicle and having a horizontal cut 203 so as not to dazzle other road users, this wide part of the beam being supplemented by an upper part of lesser width, commonly called “kink and formed by the combination of the first focused light beam 31 and the second focused light beam 41.
• FIG. 3 illustrates the first position of the lighting beam when the vehicle takes a bend on the driver's side, this first position of the lighting being obtained by the directional lighting function to illuminate the inside of the bend.
• This first position of the illuminating beam is obtained by modifying the position angle of the focused light beams, here keeping fixed the wide light beams at cut-off.
• the two focused light beams are digitally positioned, via the control law, in an end position facing the inside of the bend, namely here in a first end position exterior P1ext for the first focused light beam and in a second interior end position P2int for the second focused light beam.
• the first cutoff edge 310 is located at the level of the first outer end P1ext with an angular orientation of 15° relative to the first optical axis, on the first side 11.
• the second cutoff edge 410 is located at the level of the second end interior P2int with an orientation of 6° with respect to the second optical axis, also on the first side 11. It should be noted that if the angle of the first or second cut edges 310 and 410 with respect to the corresponding optical axis is considered as the angular spacing between the light ray forming the cut emitted by the corresponding pixelated projection means and the longitudinal direction parallel to the corresponding optical axis, it can be represented in the figures as a function of the median longitudinal axis 100, which forms an axis of symmetry of the light system when installed on the vehicle.
• FIG. 4 graphically illustrates the control law according to a first embodiment, such that it controls the angular position of the first and second cutting edges 310 and 410 with respect to the corresponding optical axis according to this first embodiment, in function of the angle of inclination of the steering wheel of the motor vehicle 1.
• the different angular positions of the first and second cutting edges 310 and 410 are defined by the control law which ensures, according to the invention, an asymmetry of the displacement of the lighting beam between one and the other side with respect to the central axis of the system light according to the invention, that is to say the median longitudinal axis 100 of the vehicle when the light system equips the vehicle.
• This asymmetry operated by the control law is due to an interruption of the angular displacement of the focused light beams when the angle of the first cutting edge 310 with respect to the first optical axis 30 reaches a limit position of 6° on the second side 12 and when the angle of the second cutting edge 410 with respect to the second optical axis 40 reaches 9° on the second side 12.
• the lighting beam has, when the bend is on the driver's side, a first position by relative to the median longitudinal axis of the vehicle, of the first side 11, which is of the order of 15°, defined by the first outer end position P1ext of the first cut-off edge 310, and that this lighting beam has , when the bend is on the passenger side, a second position relative to the median longitudinal axis, on the second side 11, which is of the order of 9°, defined by the second outer end position P2ext of the second cut-off edge 410.
• FIG. 5 schematically illustrates the first and second focused light beams 31 and 41 projected onto the vertical surface 5, in a second position of the lighting beam 2, when the vehicle takes a turn on the side opposite the driver, according to the first mode embodiment of the control law as illustrated in FIG. 4.
• the interruption of the pivoting of the lighting beam and of the focused light beams which participate in forming it, generated by the control law, is such that on the other hand, the first cutting edge 310 of the first focused light beam is in a first inner end position P1ext offset by 6° relative to the first optical axis 30, on the second side 12 of the motor vehicle 1 and on the other hand the second edge cutoff 410 of the second focused light beam is in a second outer end position P2ext offset by 9° relative to the second optical axis 40, on the second side 12 of the motor vehicle 1.
• first cutting edge 310 is able to move, on either side of the median longitudinal axis, from 15° on the first side 11 to 6° on the second side 12
• second cutting edge 410 is able to move, on either side of the median longitudinal axis, from 6° on the first side 11 to 9° on the second side 12, the angular displacement of the first and second cutting edges 310 and 410 varying according to the change in trajectory of the motor vehicle 1.
• the angular displacement of the lighting beam is thus rendered asymmetrical on either side of the longitudinal axis center of the light system, or of the median longitudinal axis of the vehicle, by appropriate control of the focused light beams and in particular an interruption of the pivoting of the focused light beam arranged on the side opposite the side of the steering wheel and the driver.
• FIG. 4 and in FIG. 5 it is made visible that in the second position of the illuminating beam, the angular spacing between the first cut-off edge and the second cut-off edge, here 3°, is reduced with respect to the angular separation between these two cuts in the first position of the lighting beam, here by 6°.
• the first end 311 of the first pixelated light beam is fixed and located here at 8° from the first optical axis, on the second side, so that a dark zone 35 is formed between the two focused light beams, between the first end 311 of the first pixelated light beam and the second cutting edge 410 of the second pixelated light beam.
• the asymmetry generated by the control law and in particular the interruption of the angular displacement of the focused light beams makes it possible, during a change of direction towards the second side 12 of the motor vehicle 1, not to disturb the driver by offering him a dark zone 35 between the first focused light beam 31 and the second focused light beam 41 which has a width reduced to 1°.
• FIG. 7 schematically illustrates the first and second focused light beams 31 and 41 projected onto the vertical surface 5, in a second position of the lighting beam 2, when the vehicle takes a turn on the side opposite the driver, according to the embodiment of FIG. 6.
• the interruption of the pivoting of the lighting beam and of the focused light beams which participate in forming it, generated by the control law, is such that on the one hand the first cutting edge 310 is in a first position of inner end P1ext at 6° with respect to the first optical axis, of the second side 12 of the motor vehicle 1 and on the other hand the second cutting edge 410 of the second focused light beam is in a second position of outer end P2ext equal at the first outer end position P1ext, that is to say at 6° relative to the corresponding optical axis, of the second side 12 of the motor vehicle 1.
• first cutting edge 310 is able to move, on either side of the median longitudinal axis, from 15° on the first side 11 to 6° on the second side 12
• second cutting edge 410 is capable of moving, on either side of the median longitudinal axis, from 6° on the first side 11 to 6° on the second side 12, the angular displacement of the first and second cutting edges 310 and 410 varying according to the change in trajectory of the motor vehicle 1.
• the angular displacement of the lighting beam is thus made asymmetrical on either side of a longitudinal axis by appropriate control of the light beams focused and in particular an interruption of the pivoting of the focused light beam arranged on the side opposite the side of the steering wheel and the driver.
• the angular separation between the first cut-off edge and the second cut-off edge here substantially zero, is reduced compared to the angular separation between these two cuts in the first position of the lighting beam, here of 6°.
• FIG. 8 illustrates a third embodiment which differs from the above in that one of the focused light beams, namely the beam light focused on the opposite side to the steering wheel and driver side, continues to rotate angularly, digitally through the control law and the activation/deactivation of the appropriate light sources as described so far, while the other focused light beam is extinguished beyond a certain angular position.
• the control law deactivates all of the light sources of the first pixelated projection means 3 generating the first focused light beam and the first cutting edge 310, while the second cutting edge 410 is digitally driven in angular pivoting without interruption until it reaches 15° on the second side 12.
• the second cutting edge goes beyond the limit position of 8° of the second side 12 such as it has been mentioned as the angular position of the first fixed end 311, the first light beam is cut so as not to generate a dark band.
• the light intensity of the second focused light beam 41 can increase simultaneously with the deactivation of the light sources constituting the first focused light beam 31.
• each of the first and second pixelated light beams 31 and 41 has a light intensity of a first value I 1 .
• the first cut-off edge 310 reaches its limit position on the second side 12
• the light sources of the pixelated projection means 3 of the first projector 111 are deactivated by law. control, so that the light intensity of the first focused light beam 31 takes a zero value I0.
• the light intensity of the second focused light beam 41 increases, until substantially doubling to take on a second value I 2 , such that the users of the motor vehicle 1 observe a continuity of intensity and do not experience any discomfort.
• the invention achieves the aims it had set itself by proposing a light system comprising two pixelated projection modules capable of ensuring a digital directional lighting function and whose focused light beams form a continuity when they move between a first position and a second position of the lighting beam.
• Variants not described here could be implemented without departing from the context of the invention, provided that, in accordance with the invention, they comprise a dehumidification method in accordance with the invention.

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• 2022
  • 2022-01-31 FR FR2200861A patent/FR3132344B1/fr active Active
• 2023
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