EP2178718A1 - System for generating a light beam in the area in front of a motor vehicle - Google Patents
System for generating a light beam in the area in front of a motor vehicleInfo
- Publication number
- EP2178718A1 EP2178718A1 EP08803008A EP08803008A EP2178718A1 EP 2178718 A1 EP2178718 A1 EP 2178718A1 EP 08803008 A EP08803008 A EP 08803008A EP 08803008 A EP08803008 A EP 08803008A EP 2178718 A1 EP2178718 A1 EP 2178718A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- leds
- illuminance
- determined
- glare
- motor vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- B60Q1/085—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
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
-
- 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
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/151—Light emitting diodes [LED] arranged in one or more lines
- F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
-
- 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
- F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
- F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching 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
- B60Q2300/05—Special features for controlling or switching of the light beam
- B60Q2300/056—Special anti-blinding beams, e.g. a standard beam is chopped or moved in order not to blind
-
- 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
- B60Q2300/40—Indexing codes relating to other road users or special conditions
- B60Q2300/41—Indexing codes relating to other road users or special conditions preceding vehicle
-
- 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
- B60Q2300/40—Indexing codes relating to other road users or special conditions
- B60Q2300/42—Indexing codes relating to other road users or special conditions oncoming vehicle
Definitions
- the invention relates to a system for generating a light beam, in particular a glare-free high beam, in advance of a motor vehicle.
- the generic system consists of a headlight comprising at least one LED array of a plurality of separately electrically controllable LEDs, an object detection device for detecting objects in the surroundings of the motor vehicle and a position determination device for determining the position of a detected object relative to the motor vehicle.
- Such a system for generating a glare-free high beam is known from DE 10 2005 014 953 A1.
- the entire illumination volume (light bundle) is subdivided into specific, complementary and non-overlapping illumination areas, wherein exactly one LED is assigned to each illumination area.
- the illuminating area (s) in which other road users (objects) are located are darkened by controlling the LEDs assigned to this illuminating area (s) to glare the road users.
- such a division of the illumination volume into individual, precisely delimited illumination areas is technically difficult or impossible to realize.
- the selective selective dimming of individual footprints is accomplished by separately driving a single LED as in FIG DE 10 2005 014 953 A1 - no longer possible.
- the object of the invention is therefore to further develop the generic system such that a targeted glare of objects is made possible even if the individual contributions of two or more LEDs overlap at least partially in the footprints of the light beam.
- This object is solved by the features of claim 1.
- the adjoining subclaims relate to advantageous embodiments.
- the light beam generated by the LED array in conjunction with an optical imaging system can be characterized by at least one horizontal illuminance distribution, the illuminance respectively a) for different positions in front of the motor vehicle and b) for different horizontal angles ( ⁇ ) relative to one Reference direction is definable.
- a direction parallel to the vehicle longitudinal direction and extending through the middle of the LED array is preferably selected.
- the at least partially horizontal-angle overlap of the contributions from two or more LEDs is taken into account in this horizontal illuminance distribution.
- a glare-critical horizontal angle range is determined as a function of the position of the object relative to the motor vehicle and as a function of an assumed or determined object width.
- the contributions of the individual LEDs for horizontal illuminance distribution and their overlap is known and the resulting horizontal illuminance can be derived as the sum of the individual contributions taking into account the overlap, the individual LEDs can be controlled such that in the glare critical horizontal angle range and based on the position of the detected object, a illuminance threshold is not exceeded.
- the position of a detected object is understood in particular to be the distance of the object to the motor vehicle (system vehicle) in the direction of travel and / or the lateral offset of the object relative to the system vehicle.
- the reference point on the system vehicle for determining the position is preferably the dummy chosen so that the position of an object with respect to the left and right headlights is slightly different.
- each illuminator has an illuminance limit of approximately 0.125 lux.
- FIG. 1 is a schematic representation of a driving situation with a system vehicle, a preceding vehicle and an oncoming vehicle,
- FIG. 2 shows a schematic representation of an LED array relative to the own roadway and the opposite roadway
- 3A shows the horizontal illuminance distribution of the right headlamp in response to an oncoming vehicle at
- FIG. 4 shows the horizontal illuminance distribution of the left headlamp in response to an oncoming vehicle in different
- FIG. 5 is a schematic representation of a driving situation with a system vehicle and an oncoming vehicle at two different distances
- FIG. 9 shows the illustration of a variant for determining the dimming values for the LEDs on the basis of the horizontal illumination intensity distribution.
- FIG. 1 shows a schematic representation of a driving situation with a system vehicle, a vehicle in front and an oncoming vehicle.
- Under system vehicle is understood to mean a motor vehicle in which the system according to the invention is installed.
- the system components of the system are shown schematically in FIG. 7, namely: Headlamp comprising an LED array with optical imaging system, object detection device, position determination device and an evaluation and control device.
- the evaluation and control Device is determined based on the data of the object detection and position determining device, a glare critical horizontal angle range.
- the control signals for the individual LEDs are then determined in the evaluation and control device based on the information about the contributions of the individual LEDs for horizontal illumination intensity distribution and their overlap.
- the correlation between a horizontal illuminance distribution to be adjusted depending on the situation and the control signals for the individual LEDs is then calculated by an algorithm in the evaluation and control device taking into account the known individual contributions and their overlapping.
- this correlation between the respective horizontal illuminance distribution to be set depending on the situation and the control signals for the individual LEDs can also be stored in a control database.
- the object detection device used is preferably a digital camera with subsequent image processing.
- This camera can advantageously also be used simultaneously as a position-determining device, wherein the position and / or size of at least parts of the object in successive camera images is analyzed for position determination.
- a camera is provided as the object detection device and a RADAR sensor or a so-called LIDAR sensor is provided as the position determination device.
- a RADAR sensor or LIDAR sensor is used both as object detection device and position determination device.
- a RADAR sensor or LIDAR sensor is used as object detection device and a camera as position determination device.
- a sensor device camera, RADAR / LIDAR sensor
- the dual use of a sensor device (camera, RADAR / LIDAR sensor) both as an object detection device and as a position determination device is particularly advantageous from a cost point of view.
- Figure 1 shows a system vehicle with a left and a right headlamp, in each of which an LED array is arranged.
- the distances to the oncoming and preceding vehicle measured in the direction of travel are each denoted by A.
- the vehicle width (object width) is denoted by B.
- the glare-critical horizontal angle ranges are plotted to glare the oncoming and the preceding vehicle, with respect to the left and right headlights: ⁇ _, ⁇ R.
- objects When using a camera with a downstream image processing device as object detection device vehicles are detected as objects preferably based on their light sources (headlights, tail lights, side marker lights, etc.).
- each light source is recognized as a vehicle, wherein a lateral area with a value of B / 2 is assumed on both sides of the light source for determining an object width to be blinded, wherein the object width overall corresponds to the value B.
- B / 2 a value of 2.5m is used.
- the object width is used in conjunction with the object position, in particular the object distance, to determine the glare-critical horizontal angle range.
- two-wheeled cyclists can be reliably recognized and de-entrained by means of their headlamp or tail light.
- For vehicles in front with two intact taillights or oncoming vehicles with two intact Headlamps would then assume an object width of 2x (B / 2) + light source spacing.
- the object width to be bleached is determined on the basis of the relative position of the respective light sources relative to one another. In this case, the object width then corresponds to the distance of the light sources, preferably for safety reasons, a certain amount is added.
- the detected light sources can also be, for example, the left and right headlights of two oncoming vehicles, which are then blinded as a common object.
- the vehicle with the smallest distance is used for the calculation of the illuminance limit value.
- these objects are subdivided into subgroups (for example, preceding or oncoming vehicles), a glare-critical horizontal angle range and an illuminance limit value being determined for each subgroup.
- the illuminance threshold is higher in the case of the preceding vehicle than in the case of the oncoming vehicle with otherwise the same distance. This takes account of the fact that, in the case of the vehicle in front, the glare occurs only indirectly via the interior mirror whose reflectance is less than 100%.
- a downstream image processing camera capable of analyzing the spectral light distribution of vehicle light sources such that headlamps (having substantially white light) can be distinguished from taillights (having substantially red light).
- FIG. 2 shows a schematic representation of an LED array with respect to the own roadway and the opposite lane.
- the exemplified LED array consists of two superposed rows of 16 separately controllable LEDs (LED chips).
- LED chips 16 separately controllable LEDs
- the LEDs are each driven individually via a pulse-width-modulated control signal, wherein the luminous flux is set via the ratio of the Pulseinschaltdauer to Pulsau- switching duration.
- a first variant for determining the dimming values for the LEDs will be described below in conjunction with FIG.
- the individual contributions of the LEDs are plotted for the horizontal illumination intensity distribution. As can be seen, these partially overlap.
- the inventively determined anti-glare horizontal angle range is also shown.
- the LEDs are first of all determined in a first step, which in themselves contributes to illuminating the light.
- power distribution in the glare-critical horizontal angle range which is relative to the respective position of the detected object above the illuminance threshold (see Figure 9, 2nd picture from above).
- These LEDs are now to be dimmed, with the degree of dimming being determined in two stages. In a first stage, it is determined for each of these LEDs which value must be dimmed so that the maximum of their contribution in the glare-critical horizontal angle range lies below the illuminance limit value.
- a second stage it is then determined based on a predetermined overlap correction value how much the LEDs are dimmed beyond the value determined in the first stage, the overlap correction value being determined taking into account the horizontal angle overlap of the LED contributions to illuminance distribution. PWM control signals for the respective LEDs are then generated from the dimming values determined in this way.
- the LEDs are also determined in a first step in this variant, which in themselves have a contribution to the illuminance distribution in the glare-critical horizontal angle range, which lies above the illuminance limit value relative to the respective position of the detected object.
- a second step it is then determined for each of these LEDs how much this must be dimmed so that the maximum of their contribution is below the illuminance threshold.
- the sum of the individual contributions is calculated on the basis of the individual contributions of the LEDs determined in the second step.
- a subsequent fourth step it is then checked whether the sum of the individual contributions in the glare-critical horizontal angle range lies above the illuminance limit value.
- the maximum of the sum of the individual contributions is determined, from the ratio of this maximum to the illuminance threshold is determined by how much each LED in the glare critical Horizontalwin - kel Suite ultimately must be dimmed so that the illuminance threshold is not exceeded with a view of the detected object.
- the horizontal illumination intensity distribution according to the invention represents a horizontal section through a three-dimensional illumination intensity distribution, which preferably runs through the maxima of the vertical illumination intensity distribution. This ensures that when using this horizontal distribution of illuminance in the vertical direction, there are no unforeseen glare, as the maximum was set for safety reasons.
- FIGS. 3A to 3F the horizontal illuminance distribution of the right headlamp is shown at different distances in response to an oncoming vehicle. Both the individual contributions of the LEDs and the resulting distribution are shown as the sum of the individual contributions. As can be seen, the decrease in illuminance and the angle range in which is lowered, with increasing distance is always larger. In addition, the angular range in which dimming is shifted with increasing distance towards more negative angles. In Figures 3A to 3F relative illuminance levels are shown.
- the system according to the invention is preferably designed to produce an illuminance of approximately 100 lux with two LED arrays in the undimmed state at a distance of 25 m. At an object distance of 1000 m, due to the quadratic decrease of the illuminance with the distance, no dimen- sion is necessary because the illuminance at the location of the object is below the value critical for glare.
- FIGS. 4A to 4F the horizontal illuminance distribution of the left headlamp is shown at different distances in response to an oncoming vehicle. Due to the distance between the two headlamps, the dimmed angular range is shifted slightly to the right compared with FIGS. 3A to 3F.
- FIG. 6 shows an illumination intensity distribution at a distance of 500 m in an enlarged view. On the basis of the marked points, it is comprehensible how the resulting illuminance in each case is the sum of the individual contributions.
- the object detection, the position determination and also the setting of a new illuminance distribution does not take place arbitrarily fast, but for each a finite period of time is required, it is provided in a particularly advantageous embodiment, to consider a retention time for generating the glare-free light beam.
- the retardation time is through
- the relative direction of movement between the motor vehicle and the object predetermines changes in the relative position of the object to the motor vehicle within the retardation time, taking into account the thus predetermined changes in the control of the individual LEDs.
- each series circuit preferably comprises the same number of LEDs. However, series circuits with a different number of LEDs are also provided.
- Each LED is active controllable bypass circuit for controlling the light intensity of this LED connected in parallel.
- the control of the bypass circuit is in each case lossless and fast via a semiconductor switch (HS), preferably a field effect transistor.
- the semiconductor switches themselves are in turn driven by a control unit.
- the control unit may be a microprocessor or a programmable logic unit.
- the bypass is digitally turned on or off by means of the semiconductor switches, i. the semiconductor switch causes in a first switching position a complete diversion of the current to the associated light emitting diode via the bypass and in the other second switching position blocking the bypass. In the first switching position, the LED is thus operated with the maximum possible light intensity, while it is switched off in the second switching position and thus dark.
- the semiconductor switch is driven in this embodiment via a pulse width modulated control signal (PWM control signal).
- PWM control signal pulse width modulated control signal
- the light intensity of the associated light-emitting diode can be adjusted continuously via the ratio of the Pulseinschaltdauer to Pulsausschaltdauer.
- the fundamental frequency of the PWM control signal is chosen so high that the individual switching on and off pulses can no longer be resolved by the eye, but only a dimming is perceived.
- only a partial diversion of the current around the associated LED is effected via the semiconductor switch.
- the series circuits with the LEDs and the associated bypass circuits are integrated with the control unit in a structural unit which is arranged in or on the headlight.
- the bypass circuits with the semiconductor switches are mounted together with the LEDs on a carrier, e.g. a circuit board arranged.
- This carrier corresponds to the LED assembly in the headlight or at least a part thereof. Since the semiconductor switches, which are preferably activated in PWM mode, are arranged spatially very close to the LEDs in this integrated embodiment and the bypass lines are correspondingly short, the electromagnetic interference emission of the overall circuit arrangement is low overall.
- the control unit is also arranged on the carrier.
- a central light control device which comprises the evaluation and control unit according to the invention (see FIG. 7)
- This information is then transmitted via the control signal lines to the control unit of the LED assembly, which then applied to the LEDs associated semiconductor switch (HS) with a desired light intensity corresponding PWM signal.
- HS semiconductor switch
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Mechanical Engineering (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007040042.1A DE102007040042B4 (en) | 2007-08-24 | 2007-08-24 | System for generating a light beam in the apron of a motor vehicle |
PCT/EP2008/060569 WO2009027221A1 (en) | 2007-08-24 | 2008-08-12 | System for generating a light beam in the area in front of a motor vehicle |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2178718A1 true EP2178718A1 (en) | 2010-04-28 |
Family
ID=39924915
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08803008A Withdrawn EP2178718A1 (en) | 2007-08-24 | 2008-08-12 | System for generating a light beam in the area in front of a motor vehicle |
Country Status (4)
Country | Link |
---|---|
US (1) | US8723948B2 (en) |
EP (1) | EP2178718A1 (en) |
DE (1) | DE102007040042B4 (en) |
WO (1) | WO2009027221A1 (en) |
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WO2009027221A1 (en) | 2009-03-05 |
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