EP3327335A1 - Headlamp and method for operating same - Google Patents

Headlamp and method for operating same Download PDF

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Publication number
EP3327335A1
EP3327335A1 EP17198239.0A EP17198239A EP3327335A1 EP 3327335 A1 EP3327335 A1 EP 3327335A1 EP 17198239 A EP17198239 A EP 17198239A EP 3327335 A1 EP3327335 A1 EP 3327335A1
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EP
European Patent Office
Prior art keywords
air
headlight
headlamp
operating situation
critical operating
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.)
Granted
Application number
EP17198239.0A
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German (de)
French (fr)
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EP3327335B1 (en
Inventor
Bernd Mühlbauer
Markus Kindler
Achim Bathe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marelli Automotive Lighting Reutlingen Germany GmbH
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Automotive Lighting Reutlingen GmbH
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Publication of EP3327335A1 publication Critical patent/EP3327335A1/en
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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
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/30—Ventilation or drainage of lighting devices
    • F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/43—Forced cooling using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/60—Heating of lighting devices, e.g. for demisting

Definitions

  • the invention relates to a headlamp according to the preamble of claim 1 and a method for operating the headlamp according to the preamble of an independent claim.
  • the object of the invention is to ensure an exchange of air with the environment during operation of the vehicle (even when stationary, such as a traffic jam situation). This minimizes the dewing risk and increases the defrosting speed even if the disc is already in beta.
  • An air guide arrangement within the headlight housing comprises a fan operable in dependence on the determined condensation-critical operating situation of the headlight, by means of which air can be conveyed from the air inlet opening for cooling the light module to the air outlet opening.
  • the fan greatly reduces the risk of condensation, in particular the cover.
  • the Enttauungs Republic can be greatly accelerated.
  • an air exchange of the headlamp can be ensured with the ambient air.
  • the arrangement of the air inlet opening and the air outlet opening can be selected within wide limits. A positioning of the aforementioned openings for the generation of a differential pressure is no longer necessary.
  • the respective opening can be arranged on a side of the headlight housing facing the vehicle floor.
  • An advantageous embodiment of the headlamp is characterized in that the condensation-critical operating situation includes a vehicle speed of zero km / h. With the aid of the vehicle speed, a high number of condensation-critical operating situations can advantageously be recorded.
  • An advantageous embodiment of the headlamp is characterized in that a non-condensation-critical operating situation is determined, wherein the fan is turned off in response to the determined non-condensation critical operating situation.
  • a non-condensation-critical operating situation is determined, wherein the fan is turned off in response to the determined non-condensation critical operating situation.
  • An advantageous embodiment of the headlamp is characterized in that the non-condensation-critical operating situation is determined when after a time of determining the condensation-critical operating situation a predetermined period of time has expired. It is thus created a simple way to energy-efficient design of the headlamp.
  • a suction line supplied to the fan comprises a passage opening which connects the interior of the suction line with an interior of the headlight housing in an air-conducting manner. If the suction line is blocked, for example, in the region of a filter in the region of the air inlet opening, then a circulation of air within the headlight can continue to be ensured. In normal operation, about 20% of the circulated volume of air is fresh air. This is achieved by adapting the cross-section of the suction line and the size of the passage opening to the interior and by the air permeability of the filter.
  • a drain line comprises a passage opening which connects the interior of the drain line with an interior of the headlight housing air-conducting. If the drain line is blocked, for example, in the region of a drain opening, then a circulation of air within the spotlight can continue to be ensured.
  • An advantageous embodiment of the headlight is characterized in that an outlet opening of a drain line of a cover, which closes a light exit opening of the headlight housing, facing arranged. This can advantageously ascend warm air on the inside of the cover and effectively prevents or reduces condensation on the cover
  • An air guide arrangement within the headlight housing comprises a ventilator operated as a function of the determined condensation-critical operating situation of the headlamp, by means of which air can be conveyed from the air inlet opening for cooling the light module to the air outlet opening.
  • FIG. 1 shows a schematic sectional view of a headlight 2, the cover 4 closes a light exit opening of a headlight housing 6.
  • the headlight 2 is arranged in a front region of a motor vehicle 1 between body parts 3 and 5.
  • a light module 8 is arranged, which radiates a Abstrahllichtver gutter 10 through the substantially transparent cover 4 through into an area in front of the motor vehicle.
  • the light module 8 comprises at least one light source, for example a semiconductor light source, which during its operation Generates heat energy.
  • a cooling arrangement 12 in the present case comprises a heat sink 14 and a fan 16.
  • the fan 16 is preferably arranged inside the spotlight housing 6.
  • the fan 16 includes, for example, an electric motor and arranged on a rotor of the electric motor rotor blades.
  • the heat sink 14 is thermally conductively connected to the light module 8.
  • the fan 16 ensures that cooling fins of the heat sink 14 are flowed around by air in order to provide heat removal from the heat sink 14 and thus from the light module 8.
  • heat sink 14 and fan 16 may also be arranged at a distance from the light module 8, for example heat pipes for connecting the heat sink 14 to the light module 8 being provided.
  • the heat pipes provide degrees of freedom for the use of the available space in the headlight housing.
  • the fan 16 is connected by means of a suction line 18 leading to air at the bottom of the headlight housing 6 arranged air inlet opening 20, which in the present case comprises an air filter 22, respectively.
  • the air filter 22 may be designed to be changeable.
  • the air inlet opening 20 is preferably spaced apart from a region which is substantially influenced by waste heat of an engine of the motor vehicle 1. This avoids that already heated air is supplied to the light module 8.
  • this intake pipe is preferably arranged at a distance from the region which is substantially influenced by the waste heat of the engine.
  • a control unit 24 operates by means of a signal 26, the fan 16 so that the fan 16 sucks air from an outer space 28 and leads over the heat sink 14. Thus, a dissipation of heat away from the light module 8 and thus cooling of the light module 8 takes place.
  • the control unit 24 comprises a processor unit and a memory unit, wherein a computer program is stored on the memory unit, which executes the method steps described here, as far as it is executed on the processor unit.
  • the air flow flowing past the heat sink 14 or flowing through the heat sink 14 is conducted into an interior space 30 of the spotlight housing 6. Due to the introduced air, a slight overpressure arises within the interior 30, which causes the air in the interior 30 to flow out through an air outlet opening 32 into the exterior space 28 of the spotlight housing 6.
  • the control unit 24, a vehicle speed 34 is supplied.
  • the controller 24 can be supplied to other variables such as an ambient temperature to determine a betau critical operating situation.
  • the control unit 24 determines a condensation-critical operating situation of the headlight 2. If this condensation-critical operating situation prevails, the fan 16 is operated to force circulation of air.
  • the condensation-critical operating situation can take place independently of the operating situation of the light module 8 to generate light. This means that the fan is operated even when the light module 8 is switched off when determining the condensation-critical situation.
  • the control unit 24 determines that the vehicle speed 34 is below a threshold value of, for example, 20 km / h, 10 km / h or even 0 km / h, if the fan 16 is not already operated, the fan 16 becomes one Forced circulation of air switched on. During operation, the fan 16 conveys air from the air inlet opening 20 for cooling the light module 8 past it to the air outlet opening 32. The forced operation of the fan 16 during the condensation-critical operating situation ensures that the probability of condensation of water on the cover pane 4 is high is reduced.
  • the condensation-critical operating situation includes, for example, a temporary parking of the vehicle in a parking lot.
  • Another example of a dew critical operating situation is stopping the vehicle during a traffic jam. In these two condensation-critical operating situations, without forced circulation of air by means of the fan 16, an unnecessary heat input into the interior space 30 of the spotlight housing 6 can take place.
  • the condensation-critical operating situation is determined.
  • the condensation-critical operating situation is present when a temperature determined by means of a temperature sensor arranged outside of the headlight housing 6 falls below a threshold value and a driving state comprises falling below a vehicle speed.
  • the control unit 24 also determines if a non-condensation-critical operating situation of the headlight 2 entry. In the non-condensation-critical operating situation, the control unit 24 releases a shutdown of the fan 16 or turns off the fan 16. However, if the light module 8 is operated to emit light, then it may be necessary for it to continue to be cooled, which is why a shutdown of the fan 16 takes place only after switching off the light module 8.
  • the non-condensation-critical operating situation can be determined, for example, when a predetermined period of time has elapsed after the condensation-critical operating situation has been determined. This causes, for example, when parking the vehicle for parking some wake of the fan 16th
  • the intake pipe 18 includes in its course a passage opening 36, which connects an interior of the intake pipe 18 with the interior 30 of the headlight housing 6.
  • the effective for the air flow cross-section of the passage opening 36 is smaller than the effective for the air flow cross-section of the air inlet opening 20 and just so large that at unintentionally closed air inlet opening 20 still an air flow by means of the fan 16 can be generated.
  • An air guide arrangement within the interior 30 of the headlight 2 comprises the fan 16 and the suction line 18.
  • FIG. 2 shows a further embodiment of the headlamp 2 in a schematic sectional view.
  • Air sucked from the interior 30 by means of the fan 16 disposed within the headlight 2 and guided over the heat sink 14.
  • a drain line 38 connects, in which the guided over the heat sink 14 air to the air outlet opening 32 is feasible.
  • the Drain line 38 has a passage opening 40, which connects an interior of the drain line 38 with the interior 30 of the headlight housing 6 fluidly.
  • the effective for the air flow cross section of the passage opening 40 is smaller than the effective for the air flow cross section of the air outlet opening 32 and just so large that in the unintentionally closed air outlet 32 still an air flow can be generated by means of the fan 16.
  • An air guide assembly within the interior 30 includes the fan 16 and the drain line 38. The operation of the fan 16 by means of the controller 24 is as to FIG. 1 described feasible.
  • FIG. 3 shows a further embodiment of the headlamp 2 in a schematic sectional view.
  • the drain opening 44 is located in a front lower portion of the inner space 30.
  • the outflow line 42 thus ends in the vicinity of the cover 4.
  • the air exiting the outlet opening 44 has previously been heated by the waste heat of the light module 8 and rises along an inner wall of the cover 4 in the inner space 30 and thus ensures a forced circulation of air in Area of the inner wall of the cover 4, which prevents or reduces condensation of water on the inner wall of the cover 4.
  • An air guide assembly within the interior 30 includes the intake conduit 18, the fan 16, and the drain conduit 42. The operation of the fan 16 by means of the controller 24 is as to FIG. 1 described feasible.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

Es wird ein Scheinwerfer (2) für ein Kraftfahrzeug (1) mit einem Scheinwerfergehäuse (6) mit einem darin angeordneten Lichtmodul (8) zur Erzeugung einer gewünschten Lichtverteilung vorgeschlagen, wobei das Scheinwerfergehäuse (6) eine Lufteinlassöffnung (20) und eine Luftauslassöffnung (32) zum Durchströmen von Luft durch das Scheinwerfergehäuse (6) umfasst.A headlight (2) for a motor vehicle (1) with a headlight housing (6) with a light module (8) arranged therein for generating a desired light distribution is proposed, the headlight housing (6) having an air inlet opening (20) and an air outlet opening (32 ) for the passage of air through the headlamp housing (6).

Description

Die Erfindung betrifft einen Scheinwerfer nach dem Oberbegriff des Anspruchs 1 sowie ein Verfahren zum Betreiben des Scheinwerfers nach dem Oberbegriff eines nebengeordneten Anspruchs.The invention relates to a headlamp according to the preamble of claim 1 and a method for operating the headlamp according to the preamble of an independent claim.

Es ist bekannt, dass sich durch Kondensation ein dünner Wasserfilm von der Innenseite eines Kraftfahrzeugscheinwerfers auf dessen Abdeckscheibe legen kann. Dieser von außen sichtbare Schleier wird gelegentlich von Endkunden irrtümlich als Defekt am Scheinwerfer betrachtet, was zu Reklamationen führt. Um eine Kondensation von Wasser innerhalb des Kraftfahrzeugscheinwerfers zu vermeiden, wird der Scheinwerfer belüftet. Entsprechende Einlass- und Auslassöffnungen sind beispielsweise aus der DE 197 26 328 bekannt. Durch diese Einlass- und Auslassöffnungen lässt sich ein Luftstrom erzeugen, der die Enttauung des Kraftfahrzeugscheinwerfers ermöglicht.It is known that a thin film of water from the inside of a motor vehicle headlight can be placed on its cover by condensation. This visible from the outside veil is occasionally considered by end customers by mistake as a defect on the headlights, which leads to complaints. To avoid condensation of water within the vehicle headlight, the headlight is ventilated. Corresponding inlet and outlet openings are for example from the DE 197 26 328 known. By means of these inlet and outlet openings, it is possible to generate an air flow which allows the vehicle headlight to defrost.

Des Weiteren ist bekannt, dass die Gesetzgebung die Entwicklung verbrauchsärmerer Fahrzeuge forciert, was insbesondere Auswirkungen auf die Ausgestaltung der Stirnfläche des Kraftfahrzeugs und damit des Strömungswiderstandskoeffizienten hat. Dies führt dazu, dass die Stirnfläche des Kraftfahrzeugs großflächig beispielsweise durch Gummidichtungen verschlossen wird. Dies hat zur Folge, dass sich an einem Scheinwerfergehäuse und insbesondere an den für Lüftungsöffnungen zugänglichen Bereichen im Wesentlichen gleiche Drücke ausbilden, was zur Folge hat, dass die zu einer Enttauung im Inneren des Kraftfahrzeugscheinwerfers nötigen Differenzdrücke an unterschiedlichen Orten des Scheinwerfergehäuses entweder nur gering ausfallen oder aber sich nur schwierig vorausbestimmen lassen. Mithin ist eine Lüftung des Innenraums des Scheinwerfers durch Differenzdruck erschwert.Furthermore, it is known that the legislation accelerates the development of fuel-efficient vehicles, which in particular has effects on the design of the end face of the motor vehicle and thus the flow resistance coefficient. This leads to the fact that the end face of the motor vehicle is closed over a large area, for example by rubber seals. As a result, essentially the same pressures are formed on a headlight housing and in particular on the areas accessible for ventilation openings, with the result that the differential pressures required for defrosting in the interior of the motor vehicle headlight either differ only slightly at different locations of the headlight housing or but difficult to predict. Thus, a ventilation of the interior of the headlight is complicated by differential pressure.

Aufgabe der Erfindung ist, bei Betrieb des Fahrzeugs (auch im Stand, wie z.B. einer Stausituation) einen Luftaustausch mit der Umgebung zu gewährleisten. Dadurch wird das Betauungsrisiko minimiert und bei schon betauter Scheibe die Enttauungsgeschwindigkeit erhöht.The object of the invention is to ensure an exchange of air with the environment during operation of the vehicle (even when stationary, such as a traffic jam situation). This minimizes the dewing risk and increases the defrosting speed even if the disc is already in beta.

Es wird ein Scheinwerfer vorgeschlagen, bei dem eine betauungskritische Betriebssituation des Scheinwerfers ermittelbar ist. Eine Luftleitanordnung innerhalb des Scheinwerfergehäuses umfasst einen in Abhängigkeit von der ermittelten betauungskritischen Betriebssituation des Scheinwerfers betreibbaren Lüfter, mittels welchem Luft von der Lufteinlassöffnung zur Kühlung des Lichtmoduls zu der Luftauslassöffnung förderbar ist.It is proposed a headlight in which a betau critical operating situation of the headlamp is determined. An air guide arrangement within the headlight housing comprises a fan operable in dependence on the determined condensation-critical operating situation of the headlight, by means of which air can be conveyed from the air inlet opening for cooling the light module to the air outlet opening.

Vorteilhaft wird durch die Feststellung des betauungskritischen Betriebs und den entsprechenden Betrieb des Lüfters das Risiko einer Betauung insbesondere der Abdeckscheibe stark reduziert. Im Falle einer bereits erfolgten Betauung kann die Enttauungsgeschwindigkeit stark beschleunigt werden. Insbesondere bei Park- oder Langsamfahrsituationen, welche eine betauungskritische Betriebssituation darstellen, kann ein Luftaustausch des Scheinwerfers mit der Umgebungsluft sichergestellt werden.It becomes advantageous by determining the condensation-critical operation and the corresponding operation the fan greatly reduces the risk of condensation, in particular the cover. In the case of a dew already occurred, the Enttauungsgeschwindigkeit can be greatly accelerated. In particular, in parking or slow driving situations, which represent a betau critical operating situation, an air exchange of the headlamp can be ensured with the ambient air.

Ein weiterer Vorteil des vorgeschlagenen Scheinwerfers liegt darin, dass die Anordnung der Lufteinlassöffnung und der Luftauslassöffnung in weiten Grenzen gewählt werden können. Eine Positionierung der vorgenannten Öffnungen für die Erzeugung eines Differenzdrucks ist nicht mehr notwendig. Vorteilhaft kann die jeweilige Öffnung an einer dem Fahrzeugboden zugewandten Seite des Scheinwerfergehäuses angeordnet werden.Another advantage of the proposed headlamp is that the arrangement of the air inlet opening and the air outlet opening can be selected within wide limits. A positioning of the aforementioned openings for the generation of a differential pressure is no longer necessary. Advantageously, the respective opening can be arranged on a side of the headlight housing facing the vehicle floor.

Eine vorteilhafte Ausführungsform des Scheinwerfers zeichnet sich dadurch aus, dass die betauungskritische Betriebssituation eine Fahrzeuggeschwindigkeit von Null km/h umfasst. Mithilfe der Fahrzeuggeschwindigkeit lässt sich vorteilhaft eine hohe Anzahl von betauungskritischen Betriebssituationen erfassen.An advantageous embodiment of the headlamp is characterized in that the condensation-critical operating situation includes a vehicle speed of zero km / h. With the aid of the vehicle speed, a high number of condensation-critical operating situations can advantageously be recorded.

Eine vorteilhafte Ausführungsform des Scheinwerfers zeichnet sich dadurch aus, dass eine nicht-betauungskritische Betriebssituation ermittelt wird,
wobei der Lüfter in Abhängigkeit von der ermittelten nicht-betauungskritischen Betriebssituation abgeschaltet wird. Mithin wird eine energieeffiziente Reduzierung des Risikos der Betauung erreicht.An advantageous embodiment of the headlamp is characterized in that a non-condensation-critical operating situation is determined,
wherein the fan is turned off in response to the determined non-condensation critical operating situation. Thus, an energy-efficient reduction of the risk of condensation is achieved.

Eine vorteilhafte Ausführungsform des Scheinwerfers zeichnet sich dadurch aus, dass die nicht-betauungskritische Betriebssituation ermittelt wird, wenn nach einem Zeitpunkt der Ermittlung der betauungskritischen Betriebssituation eine vorab festgelegte Zeitdauer abgelaufen ist. Es wird also eine einfache Möglichkeit zur energieeffizienten Ausgestaltung des Scheinwerfers geschaffen.An advantageous embodiment of the headlamp is characterized in that the non-condensation-critical operating situation is determined when after a time of determining the condensation-critical operating situation a predetermined period of time has expired. It is thus created a simple way to energy-efficient design of the headlamp.

Eine vorteilhafte Ausführungsform des Scheinwerfers zeichnet sich dadurch aus, dass eine dem Lüfter zugeführte Ansaugleitung eine Durchgangsöffnung umfasst, welche den Innenraum der Ansaugleitung mit einem Innenraum des Scheinwerfergehäuses luftführend verbindet. Ist die Ansaugleitung beispielsweise im Bereich eines Filters im Bereich der Lufteinlassöffnung verstopft, so kann weiterhin eine Zirkulation von Luft innerhalb des Scheinwerfers gewährleistet werden. In einem Normalbetrieb bestehen etwa 20 % des umgewälzten Luftvolumens aus Frischluft. Dies wird durch eine Anpassung des Querschnitts der Ansaugleitung und der Größe der Durchgangsöffnung zum Innenraum sowie durch die Luftdurchlässigkeit des Filters erreicht.An advantageous embodiment of the headlamp is characterized in that a suction line supplied to the fan comprises a passage opening which connects the interior of the suction line with an interior of the headlight housing in an air-conducting manner. If the suction line is blocked, for example, in the region of a filter in the region of the air inlet opening, then a circulation of air within the headlight can continue to be ensured. In normal operation, about 20% of the circulated volume of air is fresh air. This is achieved by adapting the cross-section of the suction line and the size of the passage opening to the interior and by the air permeability of the filter.

Eine vorteilhafte Ausführungsform des Scheinwerfers zeichnet sich dadurch aus, dass eine Abflussleitung eine Durchgangsöffnung umfasst, welche den Innenraum der Abflussleitung mit einem Innenraum des Scheinwerfergehäuses luftführend verbindet. Ist die Abflussleitung beispielsweise im Bereich einer Abflussöffnung verstopft, so kann weiterhin eine Zirkulation von Luft innerhalb des Scheinwerfers gewährleistet werden.An advantageous embodiment of the headlamp is characterized in that a drain line comprises a passage opening which connects the interior of the drain line with an interior of the headlight housing air-conducting. If the drain line is blocked, for example, in the region of a drain opening, then a circulation of air within the spotlight can continue to be ensured.

Eine vorteilhafte Ausführungsform des Scheinwerfers zeichnet sich dadurch aus, dass eine Auslassöffnung einer Abflussleitung einer Abdeckscheibe, welche eine Lichtaustrittsöffnung des Scheinwerfergehäuses verschließt, zugewandt angeordnet ist. Damit kann vorteilhaft warme Luft an der Innenseite der Abdeckscheibe aufsteigen und verhindert bzw. verringert damit wirksam eine Betauung der AbdeckscheibeAn advantageous embodiment of the headlight is characterized in that an outlet opening of a drain line of a cover, which closes a light exit opening of the headlight housing, facing arranged. This can advantageously ascend warm air on the inside of the cover and effectively prevents or reduces condensation on the cover

Ein weiterer Aspekt betrifft ein Verfahren, bei dem eine betauungskritische Betriebssituation des Scheinwerfers ermittelt wird. Eine Luftleitanordnung innerhalb des Scheinwerfergehäuses umfasst einen in Abhängigkeit von der ermittelten betauungskritischen Betriebssituation des Scheinwerfers betriebenen Lüfter, mittels welchem Luft von der Lufteinlassöffnung zur Kühlung des Lichtmoduls zu der Luftauslassöffnung förderbar ist.Another aspect relates to a method in which a betau critical operating situation of the headlamp is determined. An air guide arrangement within the headlight housing comprises a ventilator operated as a function of the determined condensation-critical operating situation of the headlamp, by means of which air can be conveyed from the air inlet opening for cooling the light module to the air outlet opening.

Weitere Merkmale, Anwendungsmöglichkeiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen der Erfindung, die in den Figuren der Zeichnung dargestellt sind. Für funktionsäquivalente Größen und Merkmale werden in allen Figuren auch bei unterschiedlichen Ausführungsformen die gleichen Bezugszeichen verwendet. In den Figuren zeigen:

Figuren 1 - 3
jeweils in einer schematischen Schnittansicht einen Scheinwerfer.
Other features, applications and advantages of the invention will become apparent from the following description of embodiments of the invention, which are illustrated in the figures of the drawing. For functionally equivalent sizes and features, the same reference numerals are used in all figures, even in different embodiments. In the figures show:
Figures 1 - 3
each in a schematic sectional view of a headlight.

Figur 1 zeigt in einer schematischen Schnittansicht einen Scheinwerfer 2, dessen Abdeckscheibe 4 eine Lichtaustrittsöffnung eines Scheinwerfergehäuses 6 verschließt. Der Scheinwerfer 2 ist in einem Frontbereich eines Kraftfahrzeugs 1 zwischen Karosserieteilen 3 und 5 angeordnet. Innerhalb des Scheinwerfergehäuses 6 ist ein Lichtmodul 8 angeordnet, welches eine Abstrahllichtverteilung 10 durch die im Wesentlichen transparente Abdeckscheibe 4 hindurch in einen Bereich vor dem Kraftfahrzeug abstrahlt. Das Lichtmodul 8 umfasst zumindest eine Lichtquelle, beispielsweise eine Halbleiterlichtquelle, welche während ihres Betriebs Wärmeenergie erzeugt. FIG. 1 shows a schematic sectional view of a headlight 2, the cover 4 closes a light exit opening of a headlight housing 6. The headlight 2 is arranged in a front region of a motor vehicle 1 between body parts 3 and 5. Within the headlight housing 6, a light module 8 is arranged, which radiates a Abstrahllichtverteilung 10 through the substantially transparent cover 4 through into an area in front of the motor vehicle. The light module 8 comprises at least one light source, for example a semiconductor light source, which during its operation Generates heat energy.

Eine Kühlanordnung 12 umfasst vorliegend einen Kühlkörper 14 und einen Lüfter 16. Der Lüfter 16 ist bevorzugt innerhalb des Scheinwerfergehäuses 6 angeordnet. Der Lüfter 16 umfasst beispielsweise einen Elektromotor sowie an einen Rotor des Elektromotors angeordnete Rotorblätter. Der Kühlkörper 14 ist wärmeleitend mit dem Lichtmodul 8 verbunden. Der Lüfter 16 sorgt dafür, dass Kühlrippen des Kühlkörpers 14 von Luft umströmt werden, um für einen Wärmeaustrag aus dem Kühlkörper 14 und damit aus dem Lichtmodul 8 zu sorgen. Selbstverständlich können Kühlkörper 14 und Lüfter 16 auch beabstandet zu dem Lichtmodul 8 angeordnet sein, wobei beispielsweise Wärmerohre zur Verbindung des Kühlkörpers 14 mit dem Lichtmodul 8 vorgesehen sind. Durch die Wärmerohre ergeben sich Freiheitsgrade zur Nutzung des vorhandenen Bauraums in dem Scheinwerfergehäuse.A cooling arrangement 12 in the present case comprises a heat sink 14 and a fan 16. The fan 16 is preferably arranged inside the spotlight housing 6. The fan 16 includes, for example, an electric motor and arranged on a rotor of the electric motor rotor blades. The heat sink 14 is thermally conductively connected to the light module 8. The fan 16 ensures that cooling fins of the heat sink 14 are flowed around by air in order to provide heat removal from the heat sink 14 and thus from the light module 8. Of course, heat sink 14 and fan 16 may also be arranged at a distance from the light module 8, for example heat pipes for connecting the heat sink 14 to the light module 8 being provided. The heat pipes provide degrees of freedom for the use of the available space in the headlight housing.

Der Lüfter 16 ist mittels einer Ansaugleitung 18 luftführend mit einer am Boden des Scheinwerfergehäuses 6 angeordneten Lufteinlassöffnung 20, welche vorliegend einen Luftfilter 22 umfasst, verbunden. Der Luftfilter 22 kann wechselbar ausgestaltet sein. Die Lufteinlassöffnung 20 wird bevorzugt beabstandet zu einem Bereich, der wesentlich von Abwärme eines Motors des Kraftfahrzeugs 1 beeinflusst ist, angeordnet. Damit wird vermieden, dass bereits erwärmte Luft dem Lichtmodul 8 zugeführt wird.The fan 16 is connected by means of a suction line 18 leading to air at the bottom of the headlight housing 6 arranged air inlet opening 20, which in the present case comprises an air filter 22, respectively. The air filter 22 may be designed to be changeable. The air inlet opening 20 is preferably spaced apart from a region which is substantially influenced by waste heat of an engine of the motor vehicle 1. This avoids that already heated air is supplied to the light module 8.

Selbstverständlich kann sich an die Lufteinlassöffnung 20 beispielsweise eine weitere, außerhalb des Scheinwerfergehäuses 6 angeordnete, nicht gezeigte Ansaugleitung anschließen. Die Öffnung dieser Ansaugleitung ist bevorzugt beabstandet zu dem Bereich, der wesentlich von der Abwärme des Motors beeinflusst ist, angeordnet.Of course, may be connected to the air inlet opening 20, for example, another, outside the headlight housing 6, not shown suction line. The opening of this intake pipe is preferably arranged at a distance from the region which is substantially influenced by the waste heat of the engine.

Ein Steuergerät 24 betreibt mittels eines Signals 26 den Lüfter 16 derart, sodass der Lüfter 16 Luft aus einem Außenraum 28 ansaugt und über den Kühlkörper 14 führt. Damit findet eine Abfuhr von Wärme von dem Lichtmodul 8 weg und damit eine Kühlung des Lichtmoduls 8 statt. Das Steuergerät 24 umfasst eine Prozessoreinheit und eine Speichereinheit, wobei auf der Speichereinheit ein Computerprogramm abgespeichert ist, welches die hier beschriebenen Verfahrensschritte ausführt, soweit es auf der Prozessoreinheit ausgeführt wird.A control unit 24 operates by means of a signal 26, the fan 16 so that the fan 16 sucks air from an outer space 28 and leads over the heat sink 14. Thus, a dissipation of heat away from the light module 8 and thus cooling of the light module 8 takes place. The control unit 24 comprises a processor unit and a memory unit, wherein a computer program is stored on the memory unit, which executes the method steps described here, as far as it is executed on the processor unit.

Der an den Kühlkörper 14 vorbeiströmende bzw. durch den Kühlkörper 14 durchströmende Luftstrom wird in einen Innenraum 30 des Scheinwerfergehäuses 6 geleitet. Durch die eingeleitete Luft entsteht innerhalb des Innenraums 30 ein geringer Überdruck, welcher dazu führt, dass die in dem Innenraum 30 befindliche Luft über eine Luftauslassöffnung 32 in den Außenraum 28 des Scheinwerfergehäuses 6 ausströmt.The air flow flowing past the heat sink 14 or flowing through the heat sink 14 is conducted into an interior space 30 of the spotlight housing 6. Due to the introduced air, a slight overpressure arises within the interior 30, which causes the air in the interior 30 to flow out through an air outlet opening 32 into the exterior space 28 of the spotlight housing 6.

Dem Steuergerät 24 wird eine Fahrzeuggeschwindigkeit 34 zugeführt. Selbstverständlich können dem Steuergerät 24 noch weitere Größen wie beispielsweise eine Umgebungstemperatur zugeführt werden, um eine betauungskritische Betriebssituation zu ermitteln. In Abhängigkeit von den zugeführten Größen ermittelt das Steuergerät 24 eine betauungskritische Betriebssituation des Scheinwerfers 2. Liegt diese betauungskritische Betriebssituation vor, so wird der Lüfter 16 zu einer Zwangsumwälzung von Luft betrieben. Die betauungskritische Betriebssituation kann unabhängig von der Betriebssituation des Lichtmoduls 8 zu einer Lichterzeugung erfolgen. Das bedeutet, dass der Lüfter auch bei ausgeschaltetem Lichtmodul 8 bei der Ermittlung der betauungskritischen Situation betrieben wird.The control unit 24, a vehicle speed 34 is supplied. Of course, the controller 24 can be supplied to other variables such as an ambient temperature to determine a betau critical operating situation. Depending on the quantities supplied, the control unit 24 determines a condensation-critical operating situation of the headlight 2. If this condensation-critical operating situation prevails, the fan 16 is operated to force circulation of air. The condensation-critical operating situation can take place independently of the operating situation of the light module 8 to generate light. This means that the fan is operated even when the light module 8 is switched off when determining the condensation-critical situation.

Stellt das Steuergerät 24 fest, dass sich die Fahrzeuggeschwindigkeit 34 unterhalb eines Schwellwerts von beispielsweise 20 km/h, 10 km/h oder gar bei 0 km/h befindet, wird, falls der Lüfter 16 nicht bereits betrieben wird, der Lüfter 16 zu einer Zwangsumwälzung von Luft eingeschaltet. Der Lüfter 16 fördert während seines Betriebs Luft von der Lufteinlassöffnung 20 zur Kühlung des Lichtmoduls 8 an diesem vorbei zu der Luftauslassöffnung 32. Durch den Zwangsbetrieb des Lüfters 16 während der betauungskritischen Betriebssituation wird erreicht, dass die Wahrscheinlichkeit einer Kondensation von Wasser an der Abdeckscheibe 4 stark reduziert wird.If the control unit 24 determines that the vehicle speed 34 is below a threshold value of, for example, 20 km / h, 10 km / h or even 0 km / h, if the fan 16 is not already operated, the fan 16 becomes one Forced circulation of air switched on. During operation, the fan 16 conveys air from the air inlet opening 20 for cooling the light module 8 past it to the air outlet opening 32. The forced operation of the fan 16 during the condensation-critical operating situation ensures that the probability of condensation of water on the cover pane 4 is high is reduced.

Die betauungskritische Betriebssituation umfasst beispielsweise ein zeitweises Abstellen des Fahrzeugs auf einem Parkplatz. Ein weiteres Beispiel für eine betauungskritische Betriebssituation ist ein Anhalten des Fahrzeugs während eines Staus. In diesen beiden betauungskritischen Betriebssituationen kann ohne eine Zwangsumwälzung von Luft mittels des Lüfters 16 ein unnötiger Wärmeeintrag in den Innenraum 30 des Scheinwerfergehäuses 6 erfolgen.The condensation-critical operating situation includes, for example, a temporary parking of the vehicle in a parking lot. Another example of a dew critical operating situation is stopping the vehicle during a traffic jam. In these two condensation-critical operating situations, without forced circulation of air by means of the fan 16, an unnecessary heat input into the interior space 30 of the spotlight housing 6 can take place.

Mithilfe eines Sensors, welcher innerhalb des Scheinwerfergehäuses 6 oder im Fahrzeug angeordnet ist, wird die betauungskritische Betriebssituation ermittelt. In einer Ausführungsform liegt die betauungskritische Betriebssituation vor, wenn eine mittels eines außerhalb des Scheinwerfergehäuses 6 angeordneten Temperatursensors ermittelte Temperatur einen Schwellwert unterschreitet und ein Fahrzustand ein Unterschreiten einer Fahrzeuggeschwindigkeit umfasst.By means of a sensor, which is arranged within the headlight housing 6 or in the vehicle, the condensation-critical operating situation is determined. In one embodiment, the condensation-critical operating situation is present when a temperature determined by means of a temperature sensor arranged outside of the headlight housing 6 falls below a threshold value and a driving state comprises falling below a vehicle speed.

Das Steuergerät 24 stellt ebenso fest, wenn eine nicht-betauungskritische Betriebssituation des Scheinwerfers 2 eintritt. In der nicht-betauungskritischen Betriebssituation gibt das Steuergerät 24 ein Abschalten des Lüfters 16 frei oder schaltet den Lüfter 16 ab. Wird das Lichtmodul 8 jedoch zu einer Lichtabstrahlung betrieben, so kann es erforderlich sein, dass dieses weiterhin gekühlt wird, weshalb eine Abschaltung des Lüfter 16 erst nach Abschaltung des Lichtmoduls 8 erfolgt. Die nicht-betauungskritische Betriebssituation kann beispielsweise dann ermittelt werden, wenn nach Feststellen der betauungskritischen Betriebssituation eine vorab bestimmte Zeitdauer abgelaufen ist. Dies bewirkt beispielsweise beim Abstellen des Fahrzeugs zum Parken einen gewissen Nachlauf des Lüfter 16.The control unit 24 also determines if a non-condensation-critical operating situation of the headlight 2 entry. In the non-condensation-critical operating situation, the control unit 24 releases a shutdown of the fan 16 or turns off the fan 16. However, if the light module 8 is operated to emit light, then it may be necessary for it to continue to be cooled, which is why a shutdown of the fan 16 takes place only after switching off the light module 8. The non-condensation-critical operating situation can be determined, for example, when a predetermined period of time has elapsed after the condensation-critical operating situation has been determined. This causes, for example, when parking the vehicle for parking some wake of the fan 16th

Die Ansaugleitung 18 umfasst in ihrem Verlauf eine Durchgangsöffnung 36, welche einen Innenraum der Ansaugleitung 18 mit dem Innenraum 30 des Scheinwerfergehäuses 6 verbindet. Der für die Luftströmung wirksame Querschnitt der Durchgangsöffnung 36 ist kleiner als der für die Luftströmung wirksame Querschnitt der Lufteinlassöffnung 20 und gerade noch so groß, dass bei ungewollt verschlossener Lufteinlassöffnung 20 noch eine Luftströmung mittels des Lüfter 16 erzeugt werden kann. Eine Luftleitanordnung innerhalb des Innenraums 30 des Scheinwerfers 2 umfasst den Lüfter 16 und die Ansaugleitung 18.The intake pipe 18 includes in its course a passage opening 36, which connects an interior of the intake pipe 18 with the interior 30 of the headlight housing 6. The effective for the air flow cross-section of the passage opening 36 is smaller than the effective for the air flow cross-section of the air inlet opening 20 and just so large that at unintentionally closed air inlet opening 20 still an air flow by means of the fan 16 can be generated. An air guide arrangement within the interior 30 of the headlight 2 comprises the fan 16 and the suction line 18.

Figur 2 zeigt eine weitere Ausführungsform des Scheinwerfers 2 in einer schematischen Schnittansicht. Im Unterschied zu Figur 1 wird in Figur 2 Luft aus dem Innenraum 30 mittels des innerhalb des Scheinwerfers 2 angeordneten Lüfters 16 angesaugt und über den Kühlkörper 14 geführt. An den Kühlkörper 14 schließt sich eine Abflussleitung 38 an, in die die über den Kühlkörper 14 geführte Luft zur Luftauslassöffnung 32 führbar ist. Die Abflussleitung 38 weist eine Durchgangsöffnung 40 auf, welche einen Innenraum der Abflussleitung 38 mit dem Innenraum 30 des Scheinwerfergehäuses 6 fluidführend verbindet. Der für die Luftströmung wirksame Querschnitt der Durchgangsöffnung 40 ist kleiner als der für die Luftströmung wirksame Querschnitt der Luftauslassöffnung 32 und gerade noch so groß, dass bei der ungewollt verschlossenen Luftauslassöffnung 32 noch eine Luftströmung mittels des Lüfters 16 erzeugt werden kann. Eine Luftleitanordnung innerhalb des Innenraums 30 umfasst den Lüfter 16 und die Abflussleitung 38. Der Betrieb des Lüfters 16 mittels des Steuergeräts 24 ist wie zu Figur 1 beschrieben durchführbar. FIG. 2 shows a further embodiment of the headlamp 2 in a schematic sectional view. In contrast to FIG. 1 is in FIG. 2 Air sucked from the interior 30 by means of the fan 16 disposed within the headlight 2 and guided over the heat sink 14. To the heat sink 14, a drain line 38 connects, in which the guided over the heat sink 14 air to the air outlet opening 32 is feasible. The Drain line 38 has a passage opening 40, which connects an interior of the drain line 38 with the interior 30 of the headlight housing 6 fluidly. The effective for the air flow cross section of the passage opening 40 is smaller than the effective for the air flow cross section of the air outlet opening 32 and just so large that in the unintentionally closed air outlet 32 still an air flow can be generated by means of the fan 16. An air guide assembly within the interior 30 includes the fan 16 and the drain line 38. The operation of the fan 16 by means of the controller 24 is as to FIG. 1 described feasible.

Figur 3 zeigt eine weitere Ausführungsform des Scheinwerfers 2 in einer schematischen Schnittansicht. Im Unterschied zu Figur 1 zeigt Figur 3 eine weitere Abflussleitung 42, deren Abflussöffnung 44 sich in einem vorderen unteren Bereich des Innenraums 30 befindet. Die Abflussleitung 42 endet damit in der Nähe der Abdeckscheibe 4. Die aus der Abflussöffnung 44 austretende Luft wurde zuvor von der Abwärme des Lichtmoduls 8 erwärmt und steigt entlang einer Innenwand der Abdeckscheibe 4 in dem Innenraum 30 auf und sorgt somit für eine Zwangszirkulation von Luft im Bereich der Innenwand der Abdeckscheibe 4, was eine Kondensation von Wasser an der Innenwand der Abdeckscheibe 4 verhindert oder reduziert. Eine Luftleitanordnung innerhalb des Innenraums 30 umfasst die Ansaugleitung 18, den Lüfter 16 und die Abflussleitung 42. Der Betrieb des Lüfter 16 mittels des Steuergeräts 24 ist wie zu Figur 1 beschrieben durchführbar. FIG. 3 shows a further embodiment of the headlamp 2 in a schematic sectional view. In contrast to FIG. 1 shows FIG. 3 another drain line 42, the drain opening 44 is located in a front lower portion of the inner space 30. The outflow line 42 thus ends in the vicinity of the cover 4. The air exiting the outlet opening 44 has previously been heated by the waste heat of the light module 8 and rises along an inner wall of the cover 4 in the inner space 30 and thus ensures a forced circulation of air in Area of the inner wall of the cover 4, which prevents or reduces condensation of water on the inner wall of the cover 4. An air guide assembly within the interior 30 includes the intake conduit 18, the fan 16, and the drain conduit 42. The operation of the fan 16 by means of the controller 24 is as to FIG. 1 described feasible.

Claims (11)

Ein Scheinwerfer (2) für ein Kraftfahrzeug (1) mit einem Scheinwerfergehäuse (6) mit einem darin angeordneten Lichtmodul (8) zur Erzeugung einer gewünschten Lichtverteilung, wobei das Scheinwerfergehäuse (6) eine Lufteinlassöffnung (20) und eine Luftauslassöffnung (32) zum Durchströmen von Luft durch das Scheinwerfergehäuse (6) umfasst, dadurch gekennzeichnet, - dass eine betauungskritische Betriebssituation des Scheinwerfers (2) ermittelbar ist, und - dass eine Luftleitanordnung innerhalb des Scheinwerfergehäuses (6) einen in Abhängigkeit von der ermittelbaren betauungskritischen Betriebssituation des Scheinwerfers (2) betreibbaren Lüfter (16) umfasst, mittels welchem Luft von der Lufteinlassöffnung (20) zur Kühlung des Lichtmoduls (8) zu der Luftauslassöffnung (32) förderbar ist. A headlight (2) for a motor vehicle (1) having a headlight housing (6) with a light module (8) arranged therein for generating a desired light distribution, wherein the headlight housing (6) an air inlet opening (20) and an air outlet opening (32) for flowing through of air through the headlamp housing (6), characterized in that - That a betau critical operating situation of the headlamp (2) can be determined, and in that an air guiding arrangement within the headlight housing (6) comprises a fan (16) which can be operated as a function of the ascertainable critical operating operating situation of the headlamp (2), by means of which air from the air inlet opening (20) for cooling the light module (8) to the air outlet opening (20). 32) is eligible. Der Scheinwerfer (2) nach dem Anspruch 1, - wobei die betauungskritische Betriebssituation eine Fahrzeuggeschwindigkeit von Null km/h umfasst. The headlamp (2) according to claim 1, - The betau critical operating situation includes a vehicle speed of zero km / h. Der Scheinwerfer (2) nach dem Anspruch 1 oder 2, - wobei eine nicht-betauungskritische Betriebssituation ermittelt wird, und - wobei der Lüfter (16) in Abhängigkeit von der ermittelten nicht-betauungskritischen Betriebssituation abgeschaltet wird. The headlamp (2) according to claim 1 or 2, - Where a non-condensation critical operating situation is determined, and - Wherein the fan (16) is turned off in response to the determined non-condensation critical operating situation. Der Scheinwerfer (2) nach Anspruch 2 und 3, wobei die nicht-betauungskritische Betriebssituation ermittelt wird, wenn nach einem Zeitpunkt der Ermittlung der betauungskritischen Betriebssituation eine vorab festgelegte Zeitdauer abgelaufen ist.The headlamp (2) according to claim 2 and 3, wherein the non-condensation critical operating situation is determined when, after a time of determining the condensation-critical operating situation, a predetermined period of time has expired. Der Scheinwerfer (2) nach einem der vorstehenden Ansprüche, - wobei eine Ansaugleitung (18) eine Durchgangsöffnung (36) umfasst, welche den Innenraum der Ansaugleitung (18) mit einem Innenraum (30) des Scheinwerfergehäuses (6) luftführend verbindet. The headlight (2) according to one of the preceding claims, - An intake duct (18) comprises a passage opening (36) which connects the interior of the intake duct (18) with an interior space (30) of the headlight housing (6) air-conducting. Der Scheinwerfer (2) nach einem der vorstehenden Ansprüche, - wobei eine Abflussleitung (38) eine Durchgangsöffnung (40) umfasst, welche den Innenraum der Abflussleitung (38) mit einem Innenraum (30) des Scheinwerfergehäuses (2) luftführend verbindet. The headlight (2) according to one of the preceding claims, - A drain line (38) comprises a passage opening (40) which connects the interior of the drain line (38) with an interior (30) of the headlight housing (2) air-conducting. Der Scheinwerfer (2) nach einem der vorstehenden Ansprüche, - wobei eine Auslassöffnung (44) einer weiteren Abflussleitung (42) einer Abdeckscheibe (4), welche eine Lichtaustrittsöffnung des Scheinwerfergehäuses (6) verschließt, zugewandt angeordnet ist. The headlight (2) according to one of the preceding claims, - An outlet opening (44) of a further outflow line (42) of a cover (4), which closes a light exit opening of the headlight housing (6), facing arranged. Ein Verfahren zum Betreiben eines Scheinwerfers (2) für ein Kraftfahrzeug (1) mit einem Scheinwerfergehäuse (2) mit einem darin angeordneten Lichtmodul (8) zur Erzeugung einer gewünschten Lichtverteilung, wobei das Scheinwerfergehäuse (6) eine Lufteinlassöffnung (20) und eine Luftauslassöffnung (32) zum Durchströmen von Luft durch das Scheinwerfergehäuse (6) umfasst, dadurch gekennzeichnet, - dass eine betauungskritische Betriebssituation des Scheinwerfers (2) ermittelt wird, und - dass eine Luftleitanordnung innerhalb des Scheinwerfergehäuses (6) einen in Abhängigkeit von der ermittelten betauungskritischen Betriebssituation des Scheinwerfers (2) betriebenen Lüfter (16) umfasst, mittels welchem Luft von der Lufteinlassöffnung (20) zur Kühlung des Lichtmoduls (8) zu der Luftauslassöffnung (32) gefördert wird. A method of operating a headlamp (2) for a motor vehicle (1) having a headlight housing (2) with a light module (8) arranged therein for generating a desired light distribution, the headlight housing (6) having an air inlet opening (20) and an air outlet opening (32) for the passage of air through the headlight housing (6), characterized - That a betau critical operating situation of the headlamp (2) is determined, and in that an air guiding arrangement within the headlight housing (6) comprises a ventilator (16) operated as a function of the determined condensation-critical operating situation of the headlamp (2), by means of which air from the air inlet opening (20) for cooling the light module (8) to the air outlet opening (20). 32). Das Verfahren nach dem vorstehenden Anspruch zum Betreiben des Scheinwerfers (2) nach einem der Ansprüche 2 bis 7.The method according to the preceding claim for operating the headlamp (2) according to one of claims 2 to 7. Ein Steuergerät (24), welches zur Ausführung des Verfahrens nach dem Anspruch 8 oder 9 ausgebildet ist.A control device (24), which is designed to carry out the method according to claim 8 or 9. Ein Kraftfahrzeug (1) umfassend einen Scheinwerfer (2) nach einem der Ansprüche 1 bis 7.A motor vehicle (1) comprising a headlight (2) according to one of claims 1 to 7.
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EP2020569A2 (en) * 2007-08-01 2009-02-04 odelo GmbH Headlamp system with controlled and/or regulated defogging system
KR20130052958A (en) * 2011-11-14 2013-05-23 현대자동차주식회사 Structure for removing moisture of head lamp
DE102014106793A1 (en) * 2014-05-14 2015-11-19 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Motor vehicle headlamps

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EP3327335B1 (en) 2022-08-24
DE102016122874A1 (en) 2018-05-30
US20180149334A1 (en) 2018-05-31

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