WO2018148767A1 - Procédé et dispositif de production d'une distribution de lumière devant un véhicule - Google Patents

Procédé et dispositif de production d'une distribution de lumière devant un véhicule Download PDF

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Publication number
WO2018148767A1
WO2018148767A1 PCT/AT2018/060028 AT2018060028W WO2018148767A1 WO 2018148767 A1 WO2018148767 A1 WO 2018148767A1 AT 2018060028 W AT2018060028 W AT 2018060028W WO 2018148767 A1 WO2018148767 A1 WO 2018148767A1
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WIPO (PCT)
Prior art keywords
light
vehicle
function
trajectory
parameter
Prior art date
Application number
PCT/AT2018/060028
Other languages
German (de)
English (en)
Inventor
Markus REINPRECHT
Thomas Jungwirth
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Zkw Group Gmbh
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Filing date
Publication date
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Publication of WO2018148767A1 publication Critical patent/WO2018148767A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • 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
    • B60Q1/085—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 special conditions, e.g. adverse weather, type of road, badly illuminated road signs or potential dangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/63—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates
    • F21S41/64—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices
    • F21S41/645—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices by electro-optic means, e.g. liquid crystal or electrochromic devices
    • 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
    • B60Q1/10—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 vehicle inclination, e.g. due to load distribution
    • B60Q1/115—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 vehicle inclination, e.g. due to load distribution by electric 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
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/30—Indexing codes relating to the vehicle environment
    • B60Q2300/31—Atmospheric conditions
    • B60Q2300/312—Adverse weather

Definitions

  • the invention relates to a method for producing a light distribution in front of a
  • the invention relates to a device for generating a light distribution in front of a vehicle, in particular a vehicle headlight, in which the method steps according to the invention are executable.
  • the invention relates to an assembly for generating a light distribution in front of a vehicle, in particular a vehicle headlight, in which the inventive
  • Procedural steps are executable.
  • the photograph is defined in the sense used here on the basis of a projection on a vertical surface in accordance with the relevant standards relating to automotive lighting technology. Furthermore, the generated photo should
  • headlamps have been developed in which a variably controllable reflector surface is formed from a plurality of micromirrors and a light emission, which is generated by a light source unit, is applied to selected regions
  • Such lighting devices are advantageous in vehicle because of their very flexible lighting functions, since the illumination intensity can be controlled individually for different lighting areas and any light functions can be realized with different light distributions, such as a low beam light distribution, a cornering light distribution, a city light distribution, a Highway light distribution, a cornering light Light distribution, a high beam light distribution, an additional high-beam light distribution or the formation of glare-free high beam (also known as Adaptive Driving Beam
  • ADB Headlighting System
  • DLP® Digital Light Processing
  • a DMD microsystem is a spatial light modulator (SLM) which consists of matrix-shaped micromirror actuators, that is to say tiltable reflecting surfaces, for example with an edge length of approximately 16 ⁇ m or else The mirror surfaces are designed so that they are movable by the action of electrostatic fields.Each micromirror is individually adjustable in its tilt angle and usually has two stable end states, which can be changed within a second up to 5000 times Individual micromirrors can each be controlled, for example, by a pulse width modulation (PWM) in order to image further states of the micromirrors in the main beam direction of the DMD arrangement whose time-averaged reflectivity lies between the two stable states of the DMD of projected image, where a mirror can represent one or more pixels. Meanwhile, DMD chips are available with high resolutions in the megapixel range.
  • the underlying technology for adjustable mirrors is Micro-Electro-Mechanical Systems (MEMS) technology.
  • the "Analog Micromirror Device” (AMD) technology has the property that the individual mirrors can be set in variable mirror positions, which are each in a stable state.
  • unwanted effects can occur when driving with a vehicle due to the influence of the weather, in that emitted headlight light in the area immediately in front of the vehicle is reflected back to precipitation, such as raindrops or snowflakes, toward the driver of the vehicle, for example can lead to visual irritation of the eye, which can lead to fatigue and even dazzling the driver.
  • headlamps based on DMD technology may have a limited life, which is often associated with high temperature sensitivity of DMD technology.
  • Parameter as at least one relevant parameter
  • Output unit preferably after conversion of the light matrix into a corresponding video signal
  • Projection optics and forming a light image in front of the vehicle.
  • the temperature parameter the precipitation intensity parameter and the
  • Precipitation size parameters can each also be referred to as environmental parameters.
  • the speed parameter may also be referred to as vehicle parameter.
  • the relevant parameter can be, for example, the temperature parameter, the
  • Precipitation intensity parameter the precipitation size parameter or the
  • Include speed parameters, or combinations of two, three or four of said parameters include.
  • Precipitation intensity parameters and the precipitation size parameter, from the relevant parameter are included. It is thereby achieved that an undesired impairment of the driver by rain or snow is particularly effectively reduced. It is particularly favorable when the temperature parameter, the
  • Speed parameters are included in the relevant parameter. It is thereby achieved that an undesired impairment of the driver by rain or snow is particularly effectively reduced.
  • both the stored or calculated light distribution for example a light distribution of a low beam, as well as the light distribution of the superimposition function, be dynamic light functions, that is adaptable to driving situations of the vehicle.
  • the driving situations of the vehicle can while driving at different speeds, as well as in the state, for example during
  • the superimposition can be particularly simple in the form of a mathematical combination of two matrices, namely a first matrix for the stored
  • optoelectronic component is taken into account.
  • HME Hete Memory Effect
  • Tl - T9 [° C]: T1 ⁇ T2 ⁇ T3 ⁇ T4 ⁇ T5 ⁇ 70 ° C ⁇ T6 ⁇ T7 ⁇ T8 ⁇ T9
  • the HME is dependent on the duty cycle of the micromirrors, the duty cycle being defined by Equations 1 and 2.
  • the duty cycle is the ratio of switched on to off, that is, between a first micromirror position and a second micromirror position. Tast (Equation 1)
  • a DMD component can be strongly heated by very strong and bright light sources and / or by high ambient temperatures. It is advantageous in the design of a cooling concept to consider the duty cycle of the DMD component. This allows headlamps to have a significantly longer service life.
  • Light distribution is associated and is transformed by a transfer function, wherein the transfer function preferably corresponds to an operation of a multiplication or addition.
  • the overlay function can be realized in a particularly simple and cost-effective manner. There is no need for complex calculations requiring, for example, a floating-point arithmetic unit that would unnecessarily increase system complexity and cost.
  • a transfer function a more complex operation or function is possible, wherein the overlay function comprises a function inverse or complementary to the transfer function to modify, that is to reduce, eliminate or in the light matrix certain areas in their respective amount when performing the operation in the light matrix to increase.
  • matrix filters known from image processing can also be used, for example, for certain details in the light matrix Stronger or more sharply stamp out.
  • two elements associated with one another are in each case an element of an overlay function, and in each case one element of a light distribution, which are both located at the same location, for example the same pixel in a light matrix.
  • Substantially zero is preferably between 30% and 70%, preferably between 40% and 60%, more preferably between 45% and 55% of the total number of elements of the light matrix. This choice ensures that the desired illumination by a corresponding headlamp meets the lighting requirements for the ride, and also a significant portion of precipitation elements is not illuminated, whereby unwanted reflections can be reduced.
  • the values of the elements of the light matrix that are substantially nonzero after the transformation are preferably larger in magnitude than the amounts of the associated values in the light distribution. This ensures that the total illumination, ie the average value of the luminous pixels and the non-luminous pixels, by a corresponding headlight at a defined reference distance the same
  • the value of the respective element is substantially zero if it is significantly below the original brightness reference value of the same element, namely that at
  • the value is analogously zero, for example, if it is 50% or even 10% below the brightness reference value.
  • Field of vision in front of the vehicle preferably in a range between 1 m and 5 m in front of the vehicle, particularly preferably in a range between 1 m and 50 m in front of the vehicle) should produce the same brightness as a conventional headlight.
  • the static projection pattern may preferably have a strip-shaped pattern, which is vertically oriented in rows, columns horizontally or obliquely as a projected light image of a light distribution in front of the vehicle, or a checkerboard-like pattern or a uniformly distributed random pattern.
  • the pattern size of the projection pattern is sized to approximate, for example, the average size of the precipitating elements at a viewing distance before the
  • Vehicle corresponds.
  • the viewing distance of the precipitation elements, in which disturbing optical reflections occur in about 1 m to 10 m.
  • a uniform projection pattern is, for example, a checkerboard pattern in which the horizontal and vertical sections or patterns repeat approximately at equal intervals.
  • a prediction function comprises a trajectory of a predicted trajectory of a hypothetical, falling precipitation element in the field of vision in front of the vehicle.
  • the trajectory is calculated from the relevant parameter and the trajectory is defined in each of its function values along its course in each case by a course vector. If the determination of the projection pattern, that is to say the overlay function, is based on the trajectories or trajectories of individual or several precipitation elements, a particularly favorable optical effect on the driver's human eye is achieved.
  • a time-dependent modulation function which is defined by a modulation source, is determined along the trajectory. Time intervals determine the repetition rate of the
  • Modulation function and the abscissa of the modulation function extends locally along the trajectory. Preferably, this is superimposed by pointwise multiplication and thereby the overlay function is formed in the form of a light modulation function.
  • a very pleasing visual impression of the process is achieved for the observer, by reducing a possible stroboscopic effect.
  • This effect can occur when moving objects are pulsed in time and if the pulse train has such a long period of time that the human eye can perceive it.
  • the stroboscopic effect can be further reduced by making the transitions between the extreme values of the modulation function not discrete, but more or less gentle. In any case, care should be taken that the switching frequency of the micromirrors is chosen to be sufficiently large to allow the human eye as little as possible to be fatigued by a possible flicker effect of the projected light image.
  • the amount of a function value of the light modulation function at a first location of the trajectory at a first time corresponds to a previous, second time.
  • the second place is located in the place to which the first place begins
  • a visually appealing effect by a particularly natural-looking appearance for the viewer is achieved when the trajectory each has a beginning and one end, the beginning of an imaginary horizontal line is located.
  • the line is located in an area that corresponds to an upper area of a vehicle-formed light image, preferably the upper boundary of the formed light image and there has the first trajectory of the trajectory and the trajectory further horizontally laterally and / or vertically down to the end runs.
  • Light modulation function is a on / off modulation, which is preferably divided into equally long time intervals.
  • the at least one light modulation function is a substantially sinusoidal modulation, which is preferably subdivided into equally long time intervals.
  • a substantially sinusoidal modulation means that the course of the modulation need not exactly correspond to a sine function, but may also have a sinusoidal profile, such as composite half-arcs.
  • the beneficial effect is a smooth transition between a luminous and a non-luminous image area.
  • the light modulation function can be formed from a time-dependent two-dimensional function, in particular from a polynomial, wherein the function value of the polynomial in magnitude and slope in the intersections of at least one cut trajectory essentially the functional value of the normals of the
  • Polynomial can lead.
  • Determining the polynomial approximation functions preferably spline or Bezier interpolations, are used.
  • a particularly homogeneous impression of the visual effect for the observer is achieved if the size of pattern details, which are intended to illuminate, for example, snowflakes or raindrops, or not evenly illuminate, in the projection pattern of the relevant Parameter dependent, measured in a plane transverse to the direction of light of
  • the distance is preferably in a range between 1 m and 5 m in front of the vehicle, more preferably in a range between 1 m and 50 m in front of the vehicle.
  • the relevant parameter preferably corresponds to the precipitation parameter and is more preferably at least a factor of three greater than that
  • the object is also achieved by a device for generating a light distribution in front of a vehicle, in particular a headlight, in which said
  • Procedural steps are executable.
  • the controllable arrangement of a plurality of individually adjustable optoelectronic elements of the optoelectronic component when set up, it is favorable to be driven with a switching frequency which depends on the relevant parameter, the switching frequency preferably being between 100 Hz and 1500 Hz.
  • the switching frequency preferably being between 100 Hz and 1500 Hz.
  • components are commercially available, so that a cost-effective implementation can be achieved.
  • the lower border ensures a flicker-free image for the viewer.
  • the duty cycle is adjusted in dependence on a desired operating temperature of the optoelectronic component so that it is greater than or equal to the value 0.5. This can lead to a particularly long service life of the optoelectronic component being achieved, which is particularly important for applications in the automotive sector.
  • a means for detecting the ambient temperature a temperature sensor of the vehicle or a telecommunications means for receiving a temperature value, which is determined for the geographical location of the vehicle, preferably by an electronic service, and provided by the electronic service is included.
  • a means for detecting the precipitation is a rain sensor, for example of a vehicle windshield wiper system, or a video-based one
  • Camera system of a vehicle preferably a driver assistance system, is included.
  • a means for detecting the vehicle speed is a tachometer of a vehicle or a video-based camera system of a vehicle, preferably a driver assistance system.
  • Micromirror Device is because commercial components are available, so that a cost effective realization can be achieved.
  • the light source comprises at least one light emitting diode, preferably a high current or power LED, or at least one laser diode. This allows an efficient design and small size of the device can be achieved.
  • a further development of the invention forms an assembly comprising at least one aforementioned device, wherein the assembly forms a headlight component which can be mounted in a vehicle.
  • the assembly may further include, for example
  • Headlamp housing include and is mountable in a vehicle. Thus, a simple assembly and maintenance of the device is ensured in a vehicle.
  • Fig. 2 is a side view of a vehicle with precipitation and conventional
  • FIG. 3 is a side view of the vehicle with precipitation and an embodiment of a headlight according to the invention
  • 5 shows the detailed view of the field of view with segmented illumination
  • 6 is a perspective view of a first embodiment of a device of a vehicle headlamp according to the invention
  • FIG. 7 is a perspective view of a second embodiment of a device of a vehicle headlamp according to the invention.
  • Fig. 8 is a front view of an optoelectronic device with an enlarged
  • FIG. 9 is a block diagram of an embodiment of a device according to the invention.
  • Fig. 12 is a functional diagram of an embodiment of an inventive
  • FIG. 16 shows an optoelectronic component with a third exemplary embodiment of FIG.
  • FIG. 17 shows the optoelectronic component according to FIG. 16 at a second time
  • FIG. 18 shows the optoelectronic component according to FIG. 16 in an enlarged detail
  • FIG. 19 shows an optoelectronic component with a cell-like overlay function at a first time as a fourth exemplary embodiment
  • FIG. 20 shows the optoelectronic component with the cell-like superimposition function.
  • FIG. 1 shows an embodiment of the invention with a method 1000 for generating a light distribution in front of a vehicle. The following process steps are carried out:
  • Precipitation 53 and / or velocity parameters 54 as at least one relevant parameter 50 are provided.
  • Component 7, 17 and at least partially reflecting the light beam in
  • FIG. 2 shows a vehicle with headlamps in a side view, wherein precipitation, for example by precipitation elements in the form of raindrops or snowflakes, can be seen.
  • a vehicle is shown with headlights in a side view, wherein a region "Detail A" is located in the light can be reflected by the low impact elements, which can adversely affect the driver's view in the direction of travel, such as by a visual irritation of the eye, which can lead to fatigue and even dazzling the driver.
  • FIG. 4 shows an enlarged detail A from FIG. 3 and illustrates a lighting device of a vehicle performing the method with light segments drawn in.
  • a projection system By means of a projection system, light is emitted line by line and the light is alternately switched dark by the projection system.
  • a horizontally oriented stripe pattern is shown.
  • the light intensity of the luminous lines is approximately twice as bright as that in the case that no fringe pattern is formed by the projection system, ie in a continuously lit system or
  • Vehicle headlights The average brightness, measured in a plane transverse to
  • Lighting direction of the vehicle headlight at a distance within the field of vision in front of the vehicle preferably in a range between 1 m and 5 m in front of the vehicle, more preferably in a range between 1 m and 50 m in front of the vehicle, can thus be the same size for the headlamp according to the invention be like a conventional headlight.
  • Fig. 5 illustrates the technical effect of the method of Fig. 1 enlarged in detail A, wherein the non-illuminated precipitation elements are not shown. It can be seen that the illuminated precipitation elements are significantly reduced in number, for example, if only 50% of the luminous area of a headlamp glow by a
  • the overlaying of the light distribution 20 with the overlay function 71 to the light matrix 80 takes place by associating each element of the overlay function 71 with an element of the light distribution 20 and is transformed by a transfer function.
  • the transfer function corresponds to an operation of multiplication.
  • the number of those elements of the light matrix 80 whose values are substantially zero after the transformation is between 30% and 70%, preferably between 40% and 60%, particularly preferably between 45% and 55% of the total number of elements of the light matrix 80.
  • the values of the elements of the light matrix 80 which are substantially nonzero after the transformation are each greater in magnitude than the magnitudes of the associated values in the light distribution 20.
  • two elements associated with one another are understood as meaning one element in each case Overlay function, as well as one element each
  • Light matrix 80 are located.
  • the value of the respective element is substantially zero if it is significantly below the original reference value of the same element, namely that of full-surface illumination.
  • the value is analogously zero, for example, if it is 50% or even 10% below the reference value.
  • the overlay function 71 may include a static projection pattern, such as a stripe-shaped pattern oriented line by line, column-wise or obliquely, or a checkered pattern or evenly distributed random pattern.
  • the selected projection pattern is switched during operation in order to achieve different lighting effects, which are perceived in the respective driving situation as pleasant as possible for the human eye of the driver.
  • the relevant parameter can also dynamically adapt the respective projection pattern. This means that, for example, the line spacing can be adapted dynamically to the current requirements.
  • Fig. 6 shows a first embodiment of an assembly according to the invention
  • the vehicle headlight 1 comprises in this example a light source 2, a primary optic 3, a projection optics 4 and an optoelectronic Component 7, as well as a drive unit 9.
  • the light source 2 which may contain, for example, a light-emitting diode or power LED and the primary optics 3 for focusing a light beam, is adapted to illuminate the optoelectronic component 7.
  • a headlight housing is not shown.
  • the optoelectronic component 7 may comprise a plurality of optoelectronic elements 8 arranged in a two-dimensional matrix.
  • the optoelectronic elements 8 are individually controllable micromirrors, in which the reflection effect of each individual element of the matrix is variably adjustable,
  • a DMD for example, a DMD.
  • the optoelectronic component 7 can detect the incident light in the direction of a
  • Projection optics 4 reflect, the controlled matrix elements individually adjust their reflection factor by modulating the angle of the micromirrors and modulate a desired light distribution to the incident light beam.
  • Projection optics 4 is oriented in the emission direction of the vehicle headlight 1 and thus generates the desired light distribution in front of the vehicle.
  • the control of the optoelectronic component 7 is carried out by the drive unit 9, in which a desired light distribution can be calculated and output to the required control of the optoelectronic elements 8 in the form of control signals to the optoelectronic component 7.
  • Fig. 7 shows a second embodiment of an assembly according to the invention
  • a light source 12 for example, a light-emitting diode
  • Bundling of the emanating from the light source 12 light beam may be configured to illuminate an optoelectronic device 17.
  • a headlight housing of the module is not shown.
  • the optoelectronic component 17 comprises a plurality of optoelectronic elements arranged in a two-dimensional matrix.
  • the Optoelectronic elements 8 individually controllable translucent elements in which the light transmission effect of each element of the matrix is variably adjustable, for example, an LCD.
  • the optoelectronic component 17 can direct the incident light in the direction of a
  • projection optics 14 wherein the controlled matrix elements individually adjust their light transmission and modulate a desired light distribution to the incident light beam.
  • the projection optics 14 is in the emission of the
  • Vehicle headlight 11 oriented and thus produces the desired light distribution in front of the vehicle.
  • the control of the optoelectronic component 17 is effected by the
  • Control unit 19 in which a light distribution can be calculated and the necessary control of the optoelectronic elements, such as the pixels of an LCD, are output in the form of control signals to the optoelectronic component 17
  • the modulation of the light allows a segmentation of the light distribution on the road, that is, the light distribution projected onto the roadway can be controlled individually for different solid angles.
  • the number of segments that can be controlled individually by a vehicle headlight is important in order to generate light distributions that are individually adapted for different driving situations.
  • the number of these segments depends, for example, on the number of micromirrors and is, for example, 854 ⁇ 480 micromirrors or pixels in a rectangular matrix arrangement.
  • the segments can be used for vehicles. If two headlamps are used for vehicles, the segments can be used for vehicles.
  • FIG. 8 shows an example of an optoelectronic component 7 in the form of a DMD in FIG.
  • An enlarged image section shows optoelectronic elements 8 arranged in matrix form, which comprise individually controllable micromirrors, in which example every second micromirror is tilted.
  • Fig. 9 shows an embodiment of an electrical block diagram of a
  • Device for generating a light distribution in front of a vehicle, in this example a vehicle headlight 1 according to FIG. 6, which is suitable for carrying out the method 1000.
  • Data memory 10 a sensor device 920 and further vehicle electronic devices or adapters 930 are connected to one another via a CAN bus 910.
  • Output unit 6 controls the optoelectronic component 7.
  • the controllable arrangement of a plurality of individually adjustable optoelectronic elements 8 of the optoelectronic component 7 is set up to be driven with a switching frequency that depends on the relevant parameter 50, wherein the
  • Switching frequency is preferably between 100 Hz and 1500 Hz.
  • the duty cycle 69 is for example set so that it is greater than or equal to the value 0.5 depending on a desired operating temperature of the optoelectronic component 7.
  • An ambient temperature sensing means 55 may be a temperature sensor of the vehicle.
  • the agent may also be a telecommunications means for
  • a means for detecting the precipitate 56 may be a rain sensor of a
  • Vehicle windshield wiper system or a video-based camera system of a vehicle for example, a driver assistance system.
  • a means for detecting the vehicle speed 57 may be a tachometer of a vehicle or a video-based camera system of a vehicle, preferably a driver assistance system.
  • the optoelectronic component 7 is a DMD digital in this embodiment
  • the light source 2 may include one or more light-emitting diodes, for example one each
  • High current or power LED or also include one or more laser diodes.
  • At least the at least one light source 2 the at least one
  • Projection optics 4 and the optoelectronic component 7 form a mountable in a vehicle headlight component, wherein at least one headlight component is mounted in a vehicle.
  • FIG. 10 shows a snapshot of precipitation in front of a stationary vehicle as seen by the driver
  • FIG. 11 a snapshot of precipitation in front of a moving vehicle as seen by the driver. It can be seen that the
  • Precipitation elements depending on the vehicle speed a trajectory, that is to follow a trajectory.
  • the trajectory also depends on the nature of the precipitation elements, ie raindrops or snowflakes.
  • the nature of the precipitation elements depends on the temperature outside the vehicle, at temperatures below freezing snowflakes form, as is well known.
  • Superimposition function 71 at least by a prediction function 31, 32, 33, 34 by means of a trajectory 110, 210, 310, 410 of a predicted trajectory of a hypothetical, falling precipitation element in the field of vision in front of the vehicle.
  • the at least one trajectory 110, 210, 310, 410 is calculated from the relevant parameter 50.
  • the Trajectory 110, 210, 310, 410 is defined in each of its function values along its course by a gradient vector 115, 116.
  • driver's eye it is particularly advantageous for the driver's eye to have an optical effect if along each trajectory 110, 210, 310, 410 there is a time-dependent one
  • Modulation function 40 which is defined by a modulation source 45 is determined.
  • Time intervals 46 determine the repetition rate of the modulation function 40, as shown in FIG. 13.
  • the abscissa 41 of the modulation function 40 extends locally along the respective trajectory 110, 210, 310, 410 and is superposed by pointwise multiplication and forms a respective overlay function 71 in the form of a
  • Light modulation function 61 the at least one light modulation function 61, which is divided into time intervals 46, which are each the same length, is an input / output modulation.
  • the magnitude of a function value of the respective light modulation function 61 at a first location 101 of the respective trajectory 110, 210, 310, 410 corresponds to a first one
  • Time point 47 the amount of a function value of the respective light modulation function 61 at a second location 102 of the respective trajectory 110, 210, 310, 410 to a
  • the second location 102 is located at the location to which the history vector 115, 116 in the first location 101 at the first time 47 points.
  • the at least one trajectory 110, 210, 310, 410 may be predicted by a linear prediction in order to keep the computational complexity low.
  • the at least one trajectory 110, 210, 310, 410 each has a beginning 111, 211 and an end 112, 212, respectively.
  • the beginning 111, 211 is located on an imaginary horizontal line 100, which can be seen in FIG.
  • the line 100 is located in an area corresponding to an upper portion of a photograph formed in front of the vehicle and the upper limit of the formed photograph, and there a first
  • Trace vector having at least one trajectory, and at least one Trajectory 110, 210, 310, 410 further extends horizontally laterally and / or vertically downwards to the ends 112, 212 thereof.
  • Gradient vectors 115, 116 at later points in time 47, 48 can be seen in the figure.
  • Modulation function 61 which is divided into equal time intervals 46, be a substantially sinusoidal modulation.
  • the light modulation function 61 may be provided, for example, by a time-dependent
  • the function value of the polynomial 510 in magnitude and slope in the points of intersection with the trajectories 110, 210, 310 and 410 essentially corresponds to the functional value of the normals 120, 220, 320, 420 of FIG Trajectories 110, 210, 310 and 410 at the same time 100 in magnitude and slope corresponds. At each subsequent time, a new polynomial is determined.
  • a polynomial 510, 610, 710 may be mathematically represented by a power series, which in turn may be graphically illustrated in accordance with the representations of a curve in the figures.
  • a limited number of trajectories 110, 210, 310, 410 can be used to determine the polynomials 510, 610, 710 and the polynomials can be used by approximation functions, for example by splines. or Bezier interpolations.
  • Approximation functions are suitable in this embodiment to describe polynomials.
  • the approximation functions themselves can be mathematically described by polynomials. In practice, multiple polynomials can often be formed to achieve the desired effect.
  • the light modulation function 61 can be applied not only to the trajectories 110, 210, 310, 410 but also to the polynomials 510, 610, 710. In this case it is not necessary to determine a large number of trajectories, but a reduced number of trajectories may be used to determine polynomials associated with a light modulation function. Consequently, along a
  • the modulation function 40 can be applied to different trajectories 110, 210, 310, 410 in various ways. From this context, it is clear that the modulation function 40 can be transformed to the trajectories 110, 210, 310, 410 by transforming the modulation function 40, for example, to the different lengths of the individual paths of the trajectories 110, 210, 310, 410.
  • the above-mentioned coincidence in the polynomial 510 and the normal 120 to the trajectory 110 in magnitude and slope means that it is substantially within limits that facilitate the determination of a polynomial by reduction to a low-order polynomial.
  • the use of a polynomial with at most second degree is advantageous.
  • slope in a point of a function or curve is meant the amount of the first derivative of the function at that point according to the mathematical analysis.
  • Overlay function can, for example, in a plane transverse to the direction of illumination of the vehicle headlight at a distance within the field of vision in front of the vehicle, preferably in a range between 1 m and 5 m in front of the vehicle, more preferably in a range between 1 m and 50 m in front of the vehicle, be measured.
  • the size may depend on the relevant parameter 50, preferably from
  • Precipitation parameter 53 and in particular by at least a factor of three be greater than the precipitation parameter size 53.
  • Embodiment of an overlay function 71 at a first time in a picture detail Four trajectories 850, 851, 852, 853 are shown, which are exemplary for the trajectory of four precipitation elements. It can also be seen how polynomials 860, 861, 862 pass through a position or location of a micromirror of the DMD chip, that is to say of the optoelectronic component 7, in which light is reflected in the projection direction of the vehicle headlight. The resolution of the optoelectronic component 7 determines the fineness of the optical representation of
  • Polynomials 860, 861, 862 The line width of the polynomial 860, 861, 862, which is determined transversely to the course of a polynomial, may be determined by the light modulation function.
  • FIG. 17 shows the optoelectronic component 7 with the superimposition function 71 according to FIG. 16 at a second time, likewise as an enlarged illustration of an image detail.
  • the polynomials 870, 871, 872 are determined on the four trajectories 850, 851, 852, 853 at the second time.
  • FIG. 18 shows in an enlarged view the optoelectronic component 7 with the
  • Superposition function 71 of FIG. 16 in an enlarged image detail as another embodiment of a superposition function.
  • the polynomials 860, 861, 862 can be seen running parallel due to the selected image detail.
  • the optoelectronic component 7 is a cell-shaped
  • Overlay function 71 shown as a fourth embodiment at a first time.
  • the polynomials 880, 881, 882 are due to the parameter 50, here, for example, as a vehicle speed equal to zero, as parallel, horizontally oriented stripe pattern recognizable.
  • the optoelectronic component 7 is a cell-shaped
  • 57 means for detecting a vehicle speed

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un procédé (1000) de production d'une distribution de lumière devant un véhicule, les étapes de procédé suivantes étant réalisées : - production (1010) d'un faisceau de rayons de lumière par au moins une source de lumière, - rayonnement (1020) du faisceau de rayons de lumière en direction d'un composant optoélectronique, - sélection (1030) d'une distribution de lumière conservée dans une banque de données, - détection (1040) d'une température ambiante en un paramètre de température, et/ou d'une précipitation en un paramètre d'intensité de précipitation et/ou un paramètre de grandeur de précipitation, - détermination (1050) des paramètres de température, d'intensité de précipitation, et/ou de grandeur de précipitation en tant qu'au moins un paramètre, - définition (1060) d'une fonction de superposition à partir du ou des paramètres, - superposition (1070) de la distribution de lumière avec la fonction de superposition à une matrice de lumière, - commande (1080) du composant optoélectronique par la matrice de lumière au moyen de l'unité de transmission, - modulation (1090) du faisceau de rayons de lumière irradié par le composant optoélectronique et réflexion au moins partielle du faisceau de rayons de lumière en direction d'au moins une optique de projection, - projection (1100) du faisceau modulé de rayons de lumière par l'optique ou les optiques de projection et constitution d'une image de lumière devant le véhicule.
PCT/AT2018/060028 2017-02-16 2018-01-30 Procédé et dispositif de production d'une distribution de lumière devant un véhicule WO2018148767A1 (fr)

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