阅读说明：本技术 用于控制机动车的前照灯的方法 (Method for controlling a headlight of a motor vehicle ) 是由 F·赫罗尔德 C·许斯特 B·库比察 M·普伦佩 U·芬克尔 C·威尔克斯 于 2020-04-22 设计创作，主要内容包括：本发明涉及一种用于控制机动车的前照灯的方法,所述前照灯包括第一光源模块和第二光源模块,所述光源模块分别具有多个光源,它们发出光,第一光源模块的光源发出的光形成第一光分布(100),第二光源模块的光源发出的光形成第二光分布(101),第一光分布(100)和第二光分布(101)部分重叠(102),第一光分布(100)和第二光分布(101)共同形成整体光分布,整体光分布的部分区域仅由第一光分布形成,该部分区域是整体光分布的垂直边缘区域(103)。(The invention relates to a method for controlling a headlight of a motor vehicle, comprising a first light source module and a second light source module, each having a plurality of light sources, which emit light, the light emitted by the light sources of the first light source module forming a first light distribution (100), the light emitted by the light sources of the second light source module forming a second light distribution (101), the first light distribution (100) and the second light distribution (101) partially overlapping (102), the first light distribution (100) and the second light distribution (101) together forming an overall light distribution, a partial region of the overall light distribution being formed exclusively by the first light distribution, the partial region being a vertical edge region (103) of the overall light distribution.)

1. A method for controlling a headlamp of a motor vehicle, wherein the headlamp comprises a first light source module and a second light source module, each light source module having a plurality of light sources emitting light, wherein the light emitted by the light sources of the first light source module exhibits a first light distribution (100) and the light emitted by the light sources of the second light source module exhibits a second light distribution (101), wherein the first light distribution (100) and the second light distribution (101) partially overlap (102), wherein the first light distribution (100) and the second light distribution (101) together form an overall light distribution, wherein a partial region of the overall light distribution is formed by the first light distribution only, characterized in that the partial region is a vertical edge region (103) of the overall light distribution.

2. Method according to the preceding claim, wherein the resolution of the first light distribution (100) is lower than the resolution of the second light distribution (101).

3. Method according to any of the preceding claims, characterized in that a temporary second light distribution is determined and a second light distribution is determined from the temporary second light distribution by moving the temporary second light distribution downwards by an offset.

4. Method according to the preceding claim, characterized in that the second light distribution is determined from the provisional second light distribution only for one of a plurality of operating modes of the headlamp.

5. Method according to one of the two preceding claims, characterized in that for each light source of the second light source module a first light intensity according to the temporal second light distribution is determined and a second light intensity according to the second light distribution is determined, where the second light intensity is equal to the first light intensity or less than the first light intensity.

6. Method according to the preceding claim, wherein when determining the second light distribution, the second light intensity of the first light source is decreased by an amount, and if there is no such decrease, the second light intensity of the first light source is greater than the first light intensity of the first light source, wherein the light intensity of the second light source of the first light source module is increased by the same amount.

7. Method according to the preceding claim, characterized in that the first and second light sources illuminate the same area.

8. Method according to any of the preceding claims, characterized in that each light source module is controlled in dependence of the overall light distribution, the operating mode of the headlamp, a vertical pivoting of the overall light distribution and/or a horizontal pivoting of the overall light distribution.

9. Method according to any of the preceding claims, characterized in that high contrast areas in the overall light distribution are determined and a third light source illuminating the high contrast areas is determined, an optimization algorithm being performed exclusively for controlling the third light source.

10. Method according to the preceding claim and according to claim 8, characterized in that the high contrast region is determined taking into account the operating mode of the headlamp, the vertical pivoting of the overall light distribution and/or the horizontal pivoting of the overall light distribution.

11. A method according to any one of the preceding claims, wherein the light source modules are controlled such that one unique light source module projects a symbol.

12. The method according to the preceding claim, characterized in that said unique light source module is a second light source module.

13. Headlamp comprising a first light source module, a second light source module and a control device, each light source module having a plurality of light sources, and the control device being configured for carrying out the method according to any one of the preceding claims.

14. Motor vehicle comprising a headlamp according to the preceding claim.

Technical Field

The invention relates to a method for controlling a headlight of a motor vehicle according to the preamble of claim 1.

Background

Methods are known from the prior art in which a headlight is controlled by means of two or more light source modules in such a way that the light emitted by the light source modules is superimposed to form a total light distribution.

WO2014/089585a1 discloses a method in which a partial region of the overall light distribution is formed by only one of the two light distributions.

Disclosure of Invention

In contrast, the object on which the invention is based is to provide a method in which the risk of ghosting and blurring in the overall light distribution is reduced. Furthermore, such a headlight and a motor vehicle having such a headlight are to be provided.

The object is achieved by a method according to claim 1, a headlight according to claim 13 and a motor vehicle according to claim 14. Embodiments of the invention are given in the dependent claims.

The head lamp includes a first light source module and a second light source module, each of which has a plurality of light sources, respectively. The light source may be, for example, an LED. Preferably, the two light source modules have the same number of light sources. The light source emits light. Light is understood here to mean electromagnetic radiation which is visible to the human eye. Light emitted by the light source of the first light source module forms a first light distribution, light emitted by the light source of the second light source module forms a second light distribution, and the first light distribution and the second light distribution partially overlap each other. The first light distribution and the second light distribution together form an overall light distribution. The partial region of the overall light distribution is formed here only by the first light distribution.

The partial region is a vertical edge region of the overall light distribution, preferably the entire vertical edge region. The term "vertical" is understood here to mean, in particular, the vertical direction when illuminating a vertical wall in front of the motor vehicle, which is oriented parallel to the transverse axis of the motor vehicle, with the headlight. When the wheels have no steering angle, the transverse axis extends in a horizontal direction perpendicular to the direction of movement of the vehicle. The vertical edge region may thus be the upper edge region of the overall light distribution when the wall is illuminated. Preferably the entire vertical edge area of the overall light distribution is formed by the first light distribution only.

The vertical edge region can also be referred to as a light-dark boundary, in particular, since it relates to the upper edge region of the overall light distribution. The area outside the overall light distribution is not illuminated by the headlamps or is illuminated only by the scattered light.

According to an embodiment of the invention, the resolution of the first light distribution may be lower than the resolution of the second light distribution. In the context of the present description, resolution is understood to mean, in particular, the number of light sources per unit of illuminated surface. In the case where the number of light sources on the light source module is the same, for example, if a larger surface is irradiated with the light source module, the resolution may be reduced. In contrast, if the surface illuminated by the light source module is small, the resolution may be increased. This is particularly true if the surface is a vertical surface located in front of a motor vehicle, for example.

It is advantageous to irradiate only a partial region with the first light source module, since the risk of blurring and ghosting in this partial region is reduced. Ghosting and blurring may for example occur through mechanical errors, temperature dependency and aging effects, thereby deviating the first light distribution and/or the second light distribution from the desired light distribution.

According to an embodiment of the invention, a temporary second light distribution may be determined. The second light distribution may then be determined from the temporary second light distribution by shifting the temporary second light distribution downwards by an offset. Thus, the second light distribution may be a temporary second light distribution moving downwards. "lower" is to be understood here as meaning the direction when a vertical surface oriented parallel to the transverse axis of the motor vehicle in front of the motor vehicle is illuminated by the headlight.

Determining the second light distribution from the temporary second light distribution by moving downwards is advantageous, since this ensures that the upper vertical edge region is formed by the first light distribution. Blurring and ghosting are particularly undesirable in this edge region, since legal requirements must be met. The temporary second light distribution can be determined, for example, as is known from the prior art.

According to one embodiment of the invention, the second light distribution is determined from the provisional second light distribution only for one of the plurality of operating modes of the headlight. The operating mode may preferably relate to the operation of the headlight in the low beam mode. The low beam mode differs from the high beam mode in that it has a lower light intensity, for example. This is advantageous because the blurring and ghosting that occurs in the low beam mode is particularly disturbing.

According to an embodiment of the invention, for each light source of the second light source module, a first light intensity according to the temporal second light distribution is determined and a second light intensity according to the second light distribution is determined. The second light intensity is equal to the first light intensity or less than the first light intensity. This embodiment is advantageous in order to keep the overall light distribution at a low level by determining the variation of the second light distribution from the temporary second light distribution.

According to an embodiment of the invention, when determining the second light distribution, the second light intensity of the first light source is decreased by an amount, and without such decrease the second light intensity of the first light source will be larger than the first light intensity of the first light source. For example, if the second light intensity of the first light source is larger than the first light intensity of the first light source by shifting the temporary second light distribution downwards by an offset amount, the light intensity is decreased by this amount. The amount may in particular be at least as large as the difference between the first and second light sources. The amount is preferably just as large as the difference.

If the light intensity of the first light source is decreased by this amount, the light intensity of the second light source of the first light source module may be increased by the same amount. Thereby the overall light distribution is not affected or only less affected.

According to one embodiment of the invention, the first and second light sources illuminate the same area. This is particularly advantageous for not affecting or only relatively little affecting the overall light distribution.

According to an embodiment of the invention, the light source module is controlled in dependence on the overall light distribution, the operating mode of the headlamp, a vertical pivoting of the overall light distribution and/or a horizontal pivoting of the overall light distribution. This applies in particular to calculating the second light distribution from the temporary second light distribution. The operating mode may be, for example, a high beam mode, a low beam mode or a glare-free low beam mode. Within the scope of the present description, horizontal pivoting of the overall light distribution is understood to mean, in particular, pivoting based on turning of the vehicle wheels. This may also be referred to as a turn light. Within the scope of the present description, vertical pivoting of the overall light distribution is understood to mean, in particular, an overall light distribution adjustment based on a headlamp illumination distance adjustment. For example, the offset for the low beam may be smaller than the offset for the high beam.

According to one embodiment of the invention, high contrast areas in the overall light distribution and a third light source illuminating these high contrast areas are determined, and then an optimization algorithm is performed specifically for controlling the third light source. The optimization algorithm may for example take into account the superposition of the light emitted by the different light sources. It is advantageous to perform the optimization algorithm exclusively for the third light source, since optimization in high contrast regions is particularly important and the run time of the optimization algorithm is reduced. In the context of the present description, a high-contrast region is understood to mean, in particular, a region in which a high contrast in the overall light distribution can be measured over a relatively small surface.

According to one embodiment of the invention, the high-contrast region is determined taking into account the operating mode of the headlight, the vertical pivoting of the overall light distribution and/or the horizontal pivoting of the overall light distribution. In the low beam mode, for example, the region near the light-dark boundary is a high contrast region. The position of the light-dark boundary may be determined by vertical pivoting. In the high beam mode, the high contrast region is located at the center of light (lichtschwewinnkt), which can be determined by vertical and horizontal pivoting.

According to one embodiment of the invention, the light source modules are controlled such that a single light source module projects a symbol. The symbol may be projected, for example, onto the road in front of the vehicle. Projecting the symbol by means of the one unique light source module is advantageous for reducing the risk of ghosting and blurring.

According to an embodiment of the invention, the only light source module projecting the symbol may be the second light source module. The light source module is preferably designed with a higher resolution, so that the symbol is particularly easily recognizable to the driver of the motor vehicle.

Drawings

The invention is explained in detail below with reference to the drawings. The same reference numerals are used for identical or similar components and for components having identical or similar functions. The attached drawings are as follows:

fig. 1 shows a schematic view of the overall light distribution of a second light distribution without shifting by an offset;

fig. 2 shows a schematic view of the overall light distribution with a second light distribution shifted by an offset.

Detailed Description

Fig. 1 shows a possible first light distribution 100 of a first light source module and a possible second light distribution 101 of a second light source module of a headlight. It should be noted that when using one of the light source modules, the entire respective light distribution 100 or 101 does not necessarily have to be present. Only a part of the respective light distribution 100 or 101 may be used. The first light distribution 100 has a lower resolution than the second light distribution 101. In the overlap region 102, the two light distributions 100 and 101 overlap.

If the headlamp is operated in low beam mode, the entire first light distribution 100 is used, whereas only the portion of the second light distribution 101 within the overlap region 102 is used. The vertical edge regions 103 of the overall light distribution resulting from the used portions of the first light distribution 100 and the second light distribution 101 are thus formed in part by the first light distribution 100 only and in part by the two light distributions 100 and 101. This involves a light-dark boundary extending a few meters in front of the motor vehicle.

In order to reduce the risk of ghosting and blurring, in particular in the overlap region 102 of fig. 1, in the embodiment of the invention according to fig. 2 the overlap region 102 is moved downwards by an offset by moving the used portion of the second light distribution 101 downwards.

If now, based on mechanical errors, temperature fluctuations and/or aging effects, the two light distributions 100 and 101 no longer agree in practice with the data stored in the control device, the risk of ghosting and blurring in the overall light distribution of fig. 2 is reduced, since the entire vertical edge region 103 is formed by the first light distribution 100 only. If, for example, the second light distribution 101 is shifted slightly upward, which is undesirable, it is hardly noticeable to the driver of the motor vehicle, since the light-dark boundary is still formed only by the first light distribution 100.

List of reference numerals

100 first light distribution

101 possible second light distribution

102 overlap region

103 vertical edge region