Abstract:
An illumination system for an interior of a motor vehicle includes a sensor, with which an environmental lighting situation is able to be detected, as well as an illumination device for illuminating the motor vehicle interior. The illumination system has a controller that is subordinate to the sensor and is superordinate the illumination device. The controller adjusts an interior lighting situation depending on the environmental lighting situation that is influenced by actual objects located in the environment of the motor vehicle, by lights of the illumination device.

Description:
BACKGROUND AND SUMMARY OF THE INVENTION 
     Exemplary embodiments of the invention relate to an illumination system for an interior of a motor vehicle, a method for the generation of an ambient interior lighting situation, as well as a motor vehicle which comprises such an illumination system or in which such a method is carried out. 
     Motor vehicles typically include interior illumination to produce a brightness level in the vehicle interior, which enables light-intensive tasks such as reading a map. So-called ambient illumination as a rule provides a low brightness level that does not enable light-intensive tasks, yet enables the location of operational elements or adjusts an interior light which is different at least from absolute darkness in an agreeable way. 
     This type of conventional interior illumination demarcates the passengers from the incidents of the environment outside the motor vehicle. 
     Exemplary embodiments of the present invention are directed to providing a safe and intuitive operation of a motor vehicle, in particular to provide an environmental lighting situation able to be experienced more intensively by passengers of the motor vehicle. 
     According to a first aspect of the invention an illumination system for an interior of a motor vehicle, comprises at least one sensor means with which an environmental lighting situation is able to be determined, as well as an illumination device for the illumination of the motor vehicle interior, wherein an ambient interior lighting situation is able to be adjusted depending on the environmental lighting situation using a control means that is subordinate to the sensor means and superordinate to the illumination device. The control means adjusts the interior illumination to the environmental lighting situation in the motor vehicle interior by controlling the illumination device that illuminates the motor vehicle interior. 
     The environmental lighting situation describes the visually perceptible information that reaches from an environment of a motor vehicle into the interior thereof and could theoretically be perceived by a vehicle passenger in each observed field of vision when looking out of a window of the motor vehicle, provided that the environment is situated at the height of the motor vehicle, so the color and brightness values of a motor vehicle environment, for example of a landscape or street scene, which surrounds a stationary motor vehicle or rolls past a driving motor vehicle. Within the scope of determined embodiments, the environmental lighting situation can also relate to the visually perceivable information for a position which the motor vehicle will only reach in the near future or has passed recently, for example a position up to one hundred meters away. 
     Any light sensors, brightness sensors, color sensors or cameras are considered as sensor means. Thus, a single sensor means or several sensor means can be present which detect, for example, brightness values or color values of the environmental lighting situation, separated according to functionalities, or which detect the environment in a divided manner according to spatial sections. 
     The illumination device can be constructed to be varyingly complex and comprises at least one lighting means, which can emit light into the motor vehicle interior, for example a light bulb, halogen bulb, fluorescent tube, light diode or organic light diode. Individual lighting means can also be combined into panels, via which light is able to be emitted on a larger surface. Preferably, several lighting means are present within the illumination device, with which different color effects of the interior lighting situation can be implemented at a point of the motor vehicle interior or light can be emitted at different regions of the motor vehicle interior. The illumination device can comprise further components, such as, for example, beam paths, fiber optics or reflectors, for example to divert light or to distribute light onto larger emission surfaces. Particular examples of illumination devices comprise light panels or light textiles present on one or more surfaces of the motor vehicle interior and which emit light in a flat manner onto the motor vehicle interior and thus contribute to the interior lighting situation. 
     The control means can be designed to be simple or complex to any extent. In a simple case, for example, the visual information detected by the sensor means is converted into electrical signals that stand for the brightness and/or the color value of the region detected by the respective sensor means, and the light emission is controlled by the illumination system, directly by these electrical signals. In a complex case, the visual information of the environmental lighting situation can be processed by the control means of an image analysis. For example, a spatial resolution of the environment and the adjustment to objects located in the environment can thus be enabled by a targeted control of an illumination device, with which the display of such objects is possible, or in the case of a moving motor vehicle or moving object of the environment, future or past positions of the environment or of the objects can be determined relative to the vehicle which represent the basis for the interior illumination. 
     The illumination system thus allows an adjustment to the environment lighting situation by the interior lighting situation. The adjustment to the environmental lighting situation by the interior lighting situation does not have to be an exact reproduction. Rather, any interior lighting situation is sufficient that reproduces a dominating brightness or a dominating color or a brightness or color distribution of the environment or a region of the environment which is taken as a respective basis, in the interior or a region of the interior which is taken as a corresponding basis, even with low approximation. 
     As a rule, the adjustment is actually a simplified display, such that not all visually perceptible information of the environment also influences the interior lighting situation, but rather information averaged over brightness ranges, color ranges and/or spatial ranges. If, for example, a motor vehicle drives down a street at night with office building facades illuminated by illuminated advertising in dominating colors, then the interior lighting situation can adjust to this environmental lighting situation. If the vehicle is located exactly at the height of a façade appearing dominatingly in white light, this is detected via sensor means, whereupon the control means controls the illumination device such that the interior lighting situation is likewise dominated by white light. If the house facade situated next at the height of the motor vehicle is dominated by blue light, then after detection by the sensor means, an interior lighting situation that is likewise dominated by blue colors can be generated via the control means by corresponding control of the illumination device. In the case of sufficient spatial resolution of the sensor means and a correspondingly designed illumination device, a detailed display can occur up to a photo-realistic display. For example, individual light sources in the environment contributing to the environmental lighting situation can be resolved by the sensor means and reproduced by the illumination device as individual objects. If the motor vehicle, for example, drives past a billboard dominated by red color, in front of which a street light having a white light stands, then the illumination device can likewise radiate red colors for the generation of the interior lighting situation, into which a white object is embedded, which is represented to be more or less abstract or detailed. 
     The illumination system thus removes the isolation between environment and motor vehicle interior in that the environmental lighting situation is adjusted to by the interior lighting situation. Thus, advantageously, the driving experience of the vehicle passenger is increased just as the sense of space and the importance of the interior of the motor vehicle. 
     The illumination system can comprise one or a few lighting means. For example, light of any color is already able to be generated by a single RGB light diode and the environmental lighting situation is able to be adjusted to as an interior lighting situation by reproduction of the color dominating the environment, for example by the RGB light diode being attached to the vehicle roof in a central position. For a better adjustment to the environmental lighting situation, however, several lighting means are preferably used. According to a particular embodiment, the illumination device enables an emission of light into the motor vehicle interior at least on the vehicle roof or on the side walls of the motor vehicle, for example on certain regions that are limited by the radiation surfaces of lighting means. In particular, in the case of light textiles, the radiation surfaces can be extensive or the entire surface that is visible to a passenger comprising, for example, the interior wall of a vehicle door. Preferably, the emission occurs both on the vehicle roof and on the side walls of the motor vehicle. Alternative embodiments alternatively or additionally provide light emission at further positions of the motor vehicle interior, for example the back sides of the front seat, the arm rests or regions of the dashboard or central console. For the person skilled in the art, it is evident that the more accurate adjustment to the environmental lighting situation can occur, the more points or surfaces the illumination device comprises for emission of light. Advantageously, the environmental lighting situation can be considered for the illumination of the motor vehicle interior, wherein vehicle passengers can advantageously take part in the environmental lighting situation. Advantageously, important stimuli and information can thus be better, in particular more intuitively, perceived. Advantageously, a secure, intuitive driving and/or an intensive experience of the environmental lighting situation are possible. 
     In one embodiment the interior lighting situation is able to be adjusted in a temporally synchronous manner to the environmental lighting situation. In the case that, for example, an environment which is driven through directly by a motor vehicle is dominated by green light from illuminated advertising and subsequently by yellow light, this momentary environmental lighting situation would also be expressed by a sequence of first dominating green light and subsequently yellow light in the interior lighting situation. 
     According to an alternative embodiment the interior lighting situation is able to be adjusted to be temporally offset to the environmental lighting situation. The environmental lighting situation can be adjusted to in an anticipatory manner, wherein sensor means already detect the environmental lighting situation of an environment situated in front of the motor vehicle and it is adjusted to in the motor vehicle as an interior lighting situation, before the motor vehicle has reached this environment on its driving route. Alternatively, the environmental lighting situation can be able to be adjusted to with temporal delay, such that the interior lighting situation adjusts, with a delay, to an environmental lighting situation which has already been left behind the vehicle. 
     The environmental lighting situation can be detected at various degrees of spatial resolution. In a simple case, only one value of the entire environment of the motor vehicle that is averaged over brightness and/or color is determined by the sensor means as an environmental lighting situation and the interior lighting situation is generated by control of the illumination device on the basis of this value. According to further embodiments the environmental lighting situation is detected for spatially resolved regions, for example a region in front of the motor vehicle, a region to the right of the motor vehicle, a region to the left of the motor vehicle and a region behind the motor vehicle, wherein, in developments, smaller and smaller regions can be resolved, for example a region to the front and to the right as well as a region behind and to the right, which can then influence the interior lighting situation in a correspondingly different manner. According to a particular embodiment, the environmental lighting situation is able to be detected by at least one sensor means, by spatial resolution of an actual object on both sides, laterally to the vehicle. Here, an actual object refers to an object that would attract the attention of a passenger of the motor vehicle as an independent object due to its size, for example a street light, an illuminated window or a billboard, and which is able to be reproduced in the interior lighting situation by the illumination device. If, for example, a sensor means determines a yellow street light rolling past the motor vehicle as an actual object of an environmental lighting situation that is dominated by white light, then the interior lighting situation is able to be adjusted by reproduction of this actual object if yellow light temporarily appears in the dominating white light, or, in particular in the case of good spatial resolution of the illumination device, a more or less highly abstract yellow object is able to be represented. 
     According to specific aspects, a spatial resolution of the environmental lighting situation and a spatial resolution during the adjustment to the environmental lighting situation by the interior lighting situation are provided, which ranges from a strongly pixelated reproduction, so a strong loss of detail, to a photo-realistic reproduction. In an extreme case, the illumination device can, for example, be an LED screen present on an inner side wall of the motor vehicle and which reproduces the scenery rolling by the driving motor vehicle. Preferably, however, the dominating brightness and/or color values of the environmental lighting situation are determined by coarse resolution of actual objects and the reproduction thereof in coarse resolution for the interior illumination situation such that the focus of the interior illumination for classic ambient illumination is more to achieve the lighting atmosphere in the space as a whole than the reproduction of visual information. 
     According to a second aspect of the invention a method for the generation of an ambient interior lighting atmosphere in an interior of a motor vehicle comprises determining an environmental lighting situation of the motor vehicle, and updating the ambient interior lighting situation depending on the determined environmental lighting situation and thus adjusting to the environmental lighting situation. 
     The detection can occur using the sensor means referred to within the illumination system according to the invention, with the updating and thus adjustment of the interior lighting situation occurring via a control means which controls a corresponding illumination device. 
     According to a specific embodiment of the method the interior lighting situation is adjusted synchronously to the environmental lighting situation; an alternative embodiment, on the other hand, provides a temporally offset adjustment, for example an anticipatory or temporally delayed adjustment. 
     As addressed within the scope of the illumination system according to the invention, the environmental lighting situation can be determined to different degrees of spatial resolution. Correspondingly, also according to a particular embodiment of the method, this is based on a resolution with which actual objects of the environment are reproduced by the interior lighting situation in a manner that is able to be resolved and is more or less abstract or pixelated when adjusting to the environmental lighting situation. 
     Implicit disclosures, which were made in the scope of the illumination system with regard to the method and reversed, are referred to. The method according to the invention is, in particular, suitable for the operation of an illumination system according to the invention. 
     A further aspect of the invention relates to a motor vehicle comprising an illumination system according to the invention, or in which a method according to the invention is carried out. 
     Further advantages, features and details result from the description below, in which—if necessary with reference to the drawing—at least one exemplary embodiment is described in detail. Features depicted in a descriptive and/or pictorial manner can form the subject matter of the invention either alone or in any sensible combination, if necessary also independent of the claims, and can, in particular, additionally also be the subject matter of one or more separate application(s). The same, similar and/or functionally identical parts are provided with the same reference numerals. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING FIGURES 
       Herein are shown: 
         FIG. 1  a schematic depiction of an exemplary illumination system, and 
         FIG. 2  a schematic flow diagram of a method according to the invention. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is a schematic depiction of an exemplary illumination system. Two front seats and three rear seats are shown in a motor vehicle  10  from the inside of a vehicle interior. The illumination system has several sensors  20   a ,  20   b ,  20   c ,  20   d ,  20   e  and  20   f  that determine the environmental lighting situation in the vehicle environment to the left and right in front of the vehicle  10  (sensors  20   a  and  20   d ), to the left of the motor vehicle  10  in a front and a rear region (sensors  20   b  and  20   c ), as well as to the right of the motor vehicle  10  in a front and a rear region (sensors  20   e  and  20   f ). Exemplary detection regions of the sensor means  20  are specified by dashed lines. The data detected by the sensor means  20  is transferred to a control means  40  via data connections which are symbolized in  FIG. 1  by dotted lines. The control means  40  transmits control commands to an illumination device  30  which comprises several lighting means  35   a - h  via further data connections which are symbolized by dashed lines in  FIG. 1 . The lighting means  35   a  present on the inner side of the left front door and the lighting means  35   b  present on the vehicle roof over the left front seat mainly adjust the interior lighting situation in the region of the front left vehicle interior region, and the lighting means  35   e  and  35   f  which are correspondingly present on the right sides adjust that of the front right vehicle interior region. The lighting means  35   c  present on the left side wall of the back region and the lighting means  35   d  present on the vehicle roof over the left back seat region are responsible for the interior lighting situation in the left rear region, and the lighting means  35   g  and  35   h  for the right rear region. 
     An actual object  50   a  is located to the left of the motor vehicle  10  at the height of the left front seat. The visual information emitted from the actual object  50   a  and which contributes to the environmental lighting situation in this region is detected by the sensor means  20   b  and corresponding data is transmitted to the control means  40 . This transmits control commands to the lighting means  35   a  and  35   b , which emit light in order to adjust to the environmental lighting situation in the motor vehicle interior as an interior lighting situation of this region on the basis of the visual information, in which the environmental lighting situation determined by the sensor means  20   a  also enters to the right and to the front of the motor vehicle  10 . The environmental lighting situation in the region of the left rear space is determined, on the other hand, substantially by the actual object  50   b  detected in this region mainly by sensor means  20   c  and partially even by sensor means  20   b . The corresponding data is transmitted to the control means  40 , which sends control data in order to adjust to the environmental lighting situation of the detected region as an interior lighting situation in the region of the left rear space, substantially by the lighting means  35   c  and  35   d . No actual objects  50  are specified in the environment on the right side of the motor vehicle  10 . The environmental lighting situation in this region is determined substantially, for example, by the sky and the ground surface or the covering thereof, determined by the sensor means  20   e  and  20   f  and reproduced via the lighting means  35   e  to  35   h  as an interior lighting situation. Overall, an environmental lighting situation and an interior lighting situation are composed from these environmental lighting situations and interior lighting situations which now describe partial regions. 
     As the motor vehicle  10  advances in a forward direction, which is symbolized by an open arrow, the actual object  50   a  migrates in an enhanced manner into the detection region of the sensor means  20   c  and correspondingly has an enhanced influence on the interior lighting situation in the region of the left rear region. This is based on a synchronized adjustment of the interior lighting situation, depending on the environmental lighting situation. In the case of a temporally offset and widely anticipatory adjustment, the environmental lighting situation to the right in front of the motor vehicle  10  determined by the sensor means  20   a  would, for example, form the basis for the control of the lighting means  35   a  to  35   d . In the case of a less widely anticipatory adjustment, the environmental lighting situation detected by the sensor means  20   b  would, for example, form the basis for the control of the lighting means  35   c  and  35   d , so would, for example, consider the contribution of the actual object  50   a  to the environmental lighting situation for the interior situation of the left rear space, while the actual object  50   a  itself is still located at the height of the left front seat. In the case of a delayed or retrospective adjustment, the region of the environmental lighting situation detected by the sensor means  20   c  which is influenced substantially by the actual object  50   b , would, for example, substantially form the basis for the interior situation in the region of the left front seat which is adjusted by means of the lighting means  35   a  and  35   b.    
     For the person skilled in the art it is evident that  FIG. 1  only reproduces, by way of example, a possible number and arrangement of sensor means  20  and lighting means  35  of an illumination device  30  as well as data connections to the control means  40 . The person skilled in the art can thus, of course, make adjustments in order to adapt the shown illumination system for motor vehicles having a different interior distribution and/or for illumination systems having a deviating number, arrangement and/or functionality (for example white light lighting means in comparison to colored light lighting means). 
       FIG. 2  shows a schematic flow diagram of a method according to the invention. In a first method step  500 , an environmental lighting situation of the motor vehicle  10  is determined by using sensor means  20 , for example. In a second method step  600 , an adjustment of the interior lighting situation takes place depending on the determined environmental lighting situation. The adjustment takes place, for example, by a control means  40  transmitting control commands to lighting means  35  of an illumination device  30  depending on data which represents the environmental lighting situation. The lighting means  35  generate an interior lighting situation which adjusts to the environmental lighting situation on the basis of the control commands which control, for example the brightness, the color and/or the lighting duration of the light emitted by them. 
     Although the invention has been illustrated and explained in detail by preferred exemplary embodiments, the invention is not restricted by the disclosed examples and other variations can be derived from this by the person skilled in the art without leaving the scope of protection of the invention. It is therefore clear that a plurality of possibilities for variation exist. It is likewise clear that embodiments that are referred to by way of example truly only represent examples which cannot be understood in any way as a restriction of the scope of protection, the application possibilities or the configuration of the invention. Rather, the description and description of the figures above put the person skilled in the art in the position to practically implement the exemplary embodiments, wherein the person skilled in the art can implement a plurality of changes, for example with regard to the function or the arrangement of individual elements referred to in an exemplary embodiment, in the knowledge of the disclosed inventive concept without leaving the scope of protection which is defined by the claims and the legal equivalents thereof, such as, for example further explanation in the description.