WO2009040710A2 - Lighting system for a motor vehicle - Google Patents

Lighting system for a motor vehicle Download PDF

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Publication number
WO2009040710A2
WO2009040710A2 PCT/IB2008/053810 IB2008053810W WO2009040710A2 WO 2009040710 A2 WO2009040710 A2 WO 2009040710A2 IB 2008053810 W IB2008053810 W IB 2008053810W WO 2009040710 A2 WO2009040710 A2 WO 2009040710A2
Authority
WO
WIPO (PCT)
Prior art keywords
lighting system
light
ignitions
masks
initial
Prior art date
Application number
PCT/IB2008/053810
Other languages
French (fr)
Other versions
WO2009040710A3 (en
Inventor
Sven Schellinger
Anatoli Saveliev
Original Assignee
Philips Intellectual Property & Standards Gmbh
Koninklijke Philips Electronics N.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philips Intellectual Property & Standards Gmbh, Koninklijke Philips Electronics N.V. filed Critical Philips Intellectual Property & Standards Gmbh
Publication of WO2009040710A2 publication Critical patent/WO2009040710A2/en
Publication of WO2009040710A3 publication Critical patent/WO2009040710A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1415—Dimming circuits
    • B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/689—Flaps, i.e. screens pivoting around one of their edges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/17—Discharge light sources
    • F21S41/172—High-intensity discharge light sources

Definitions

  • the invention relates to a lighting system for a motor vehicle, to provide three lighting functions in which the color temperature is the same, comprising a projector headlamp in which is arranged a high-pressure discharge lamp which is connected to at least one ballast.
  • Present-day lighting systems for motor vehicles employ different technologies, such as halogen lamps and xenon lamps, to perform the requisite lighting functions of daytime running light, low-beam light and high-beam light. Because of this, different colors of light and different color temperatures are obtained when a change is made between the different lighting functions, such as from daytime running light to low-beam light for example. Also, because of the at least two lamp systems that are required, a considerable amount of overall space is required.
  • the invention aims to provide a remedy. It is the object of the invention to provide a lighting system for a motor vehicle which provides three lighting functions and, in doing so, is of small overall size and can be produced at low cost. In accordance with the invention, this object is achieved by providing precisely one high- pressure discharge lamp and the projector headlamp having two masks which can be moved into the beam path of the said projector headlamp. In the case of bi-xenon headlamps, it is known for the beam path to be acted on selectively by means of a movable mask that can be moved into the beam path of the projector headlamp, by which means the "low-beam light” and "high-beam light” functions can be obtained with only one high-pressure discharge lamp.
  • a third, "daytime running light" function becomes possible, the beam path of the projector headlamp being screened off in a way that is suited to the statutory requirements.
  • a filter element and/or a mirror and/or a diffusing lens are also be used to act on the beam path.
  • the invention creates a lighting system for a motor vehicle which provides three lighting functions in which the color is the same and the color temperature is the same and which, at the same time, is of small overall size and can be produced at low cost.
  • the masks are mounted by means of respective points of pivot, with the points of pivot being arranged on opposite sides.
  • a control unit is preferably provided by means of which the masks can be actuated in such a way that the functions of daytime running light, low-beam light and high- beam light can be obtained. This enables the lighting system to be operated in a convenient way.
  • the ballast is designed to be dimmable. In this way, it becomes possible for a selective change to be made in the supply current to the lamp by the use of only one ballast, by which means it is possible for regulation of the brightness of the high-pressure discharge lamp to be achieved.
  • a light sensor is provided that is connected to the control unit of the masks.
  • means are provided to generate a defined sequence of initial ignitions to produce a bright flashed light. It is possible in this way for the extremely bright initial ignitions of the arc of the high-pressure discharge lamp, which are fired in succession without the lamp going into a stable operating state, to be deliberately strung together into a sequence. Studies have shown that a sudden flash of light which is triggered in front of a vehicle causes an object to stand out in such a way that the driver can perceive it at a considerably earlier point in time. By generating a sequence of initial ignitions, a flashed light can be produced which makes distant objects perceptible to the driver at an earlier point in time.
  • the means of generating a defined sequence of initial ignitions is preferably a triggered switch.
  • the frequency of the defined sequence of initial ignitions is advantageously able to be set. This makes it possible for the frequency to be varied, as a function of the distance away at which an object is situated for example.
  • the generation of the flashed light can, in addition, be limited to times when critical situations occur when objects suddenly appear in the path of a motor vehicle.
  • At least one sensor for the early detection of objects is provided which is connected to the means of generating a defined sequence of initial ignitions.
  • What are suitable for this purpose are, in particular, infrared cameras, radar devices or even ultrasonic sensors. Early detection of distant objects can be achieved with these known means without causing any visual nuisance to other road users.
  • a distant object having been detected, a flashed light can then be initiated to make the object perceptible to the driver at an early point in time.
  • a camera system that will continue to be suitable and that is familiar in the field of automobiles is also what is called the lidar system which, unlike radar systems, is based on light waves.
  • the single Figure 1 is a schematic view of a projector module of a projector headlamp.
  • the lighting system for a motor vehicle that has been selected as an embodiment comprises a xenon lamp 1 which is arranged inside a reflector 2.
  • the xenon lamp 1 is provided with an integrated ignition circuit 11.
  • Arranged opposite the reflector 2 is a lens 3.
  • the masks 4, 5 Arranged between the reflector 2 and the lens 3 are two masks 4, 5 that are able to be pivoted into the beam path of the projector headlamp by means of points of pivot 41, 51. In line with the functions they perform, the masks 4, 5 are of different forms and thus project into the beam path of the projector headlamp in different ways.
  • the mask 4 corresponds to the mask that is known in the prior art for bi-xenon headlamp systems, which enables a switch to be made between the "low-beam light” and "high-beam light” lighting functions.
  • the mask 4 is pivoted into the beam path of the projector headlamp; if the mask 4 is situated out of the beam path, then the "high-beam light” function is in operation.
  • the mask 5 is used to switch between daytime running light and low- beam/high-beam light. If the mask 5 is situated out of the beam path of the projector headlamp, then either the "low-beam light” or “high-beam light” function is operative, depending on the position of the mask 4. To enable the "daytime running light” function to be performed, the mask 5 is pivoted into the beam path of the projector headlamp. When the mask 5 is in this position, the mask 4 should be pivoted out of the beam path.
  • a sensor for ambient brightness is provided that is connected to a control system that is set up to control the masks 4, 5.
  • the sensor for ambient brightness transmits an appropriate brightness signal to the mask control system, which latter positions the mask 5 in the position for the "daytime running light" function.
  • the lamp 1 performs a daytime running light function which produces the desired attentiveness by having a dazzle effect on the oncoming traffic.
  • a dimmable ballast is provided, the supply current from which is regulated down to a lower level in daylight, thus enabling the lamp 1 to be operated at 20 watts in the embodiment.
  • the mask 5 is pivoted out of the beam path of the projector headlamp.
  • the ballast is set to a higher power, which in the embodiment enables the lamp 1 to be operated at 35 watts.
  • the lighting system may be fitted with a means of generating a bright flashed light to enable distant objects to be perceived at an early point in time.
  • the xenon lamp 1 is connected to the ballast via a triggerable switch.
  • the ballast of the lamp 1 is also connected to a radar sensor and, as an option, to a speed sensor. In the event of an object being detected by the radar sensor, the lamp 1 is changed to a flashed mode by means of a sequence of intermediate ignitions.
  • the ignition circuit 11 is excited at regular intervals by the triggerable switch to cause initial ignition of the lamp 1. Between the initial ignitions, the lamp 1 is not brought into a stable state of operation.
  • the flashed light may also be initiated by means of a sequence of intermediate ignitions. These intermediate ignitions may for example be produced by means of a capacitor that is selectively discharged across the arc of the gas discharge lamp.
  • a timer module may be provided by means of which the duration of the flashed light that is initiated can be set, to three seconds for example.

Abstract

The invention relates to a lighting system for a motor vehicle, to provide three lighting functions in which the color temperature is the same, comprising a projector headlamp in which is arranged a high-pressure discharge lamp which is connected to at least one ballast, wherein precisely one high-pressure discharge lamp (1) is provided and the projector headlamp has two masks (4, 5) which can be moved into the beam path of the said projector headlamp.

Description

LIGHTING SYSTEM FOR A MOTOR VEHICLE
The invention relates to a lighting system for a motor vehicle, to provide three lighting functions in which the color temperature is the same, comprising a projector headlamp in which is arranged a high-pressure discharge lamp which is connected to at least one ballast. Present-day lighting systems for motor vehicles employ different technologies, such as halogen lamps and xenon lamps, to perform the requisite lighting functions of daytime running light, low-beam light and high-beam light. Because of this, different colors of light and different color temperatures are obtained when a change is made between the different lighting functions, such as from daytime running light to low-beam light for example. Also, because of the at least two lamp systems that are required, a considerable amount of overall space is required.
One possible way of avoiding different colors of light and different color temperatures is to use the same lamp technology for all the lighting functions. For all-xenon lighting however, it would be very expensive to do this. What is more, the overall size of the headlamp would be very large, due to the second ballast that would be required for a dual- function xenon headlamp and a third ballast that would be required for a triple-function xenon headlamp.
It is to this problem that the invention aims to provide a remedy. It is the object of the invention to provide a lighting system for a motor vehicle which provides three lighting functions and, in doing so, is of small overall size and can be produced at low cost. In accordance with the invention, this object is achieved by providing precisely one high- pressure discharge lamp and the projector headlamp having two masks which can be moved into the beam path of the said projector headlamp. In the case of bi-xenon headlamps, it is known for the beam path to be acted on selectively by means of a movable mask that can be moved into the beam path of the projector headlamp, by which means the "low-beam light" and "high-beam light" functions can be obtained with only one high-pressure discharge lamp. By providing a further mask, which can be separately actuated, a third, "daytime running light" function becomes possible, the beam path of the projector headlamp being screened off in a way that is suited to the statutory requirements. Rather than a mask, what may also be used to act on the beam path are a filter element and/or a mirror and/or a diffusing lens.
The invention creates a lighting system for a motor vehicle which provides three lighting functions in which the color is the same and the color temperature is the same and which, at the same time, is of small overall size and can be produced at low cost.
In one form of the invention, the masks are mounted by means of respective points of pivot, with the points of pivot being arranged on opposite sides. By these means, it becomes possible for the masks to be separately actuated without interfering with one another. A control unit is preferably provided by means of which the masks can be actuated in such a way that the functions of daytime running light, low-beam light and high- beam light can be obtained. This enables the lighting system to be operated in a convenient way.
In one form of the invention, the ballast is designed to be dimmable. In this way, it becomes possible for a selective change to be made in the supply current to the lamp by the use of only one ballast, by which means it is possible for regulation of the brightness of the high-pressure discharge lamp to be achieved.
Advantageously, a light sensor is provided that is connected to the control unit of the masks. By this means, it becomes possible for the masks to be actuated as a function of the external lighting conditions. In this way, the mask that is provided for the daytime running light function can be pivoted automatically to the requisite position.
In a further form of the invention, means are provided to generate a defined sequence of initial ignitions to produce a bright flashed light. It is possible in this way for the extremely bright initial ignitions of the arc of the high-pressure discharge lamp, which are fired in succession without the lamp going into a stable operating state, to be deliberately strung together into a sequence. Studies have shown that a sudden flash of light which is triggered in front of a vehicle causes an object to stand out in such a way that the driver can perceive it at a considerably earlier point in time. By generating a sequence of initial ignitions, a flashed light can be produced which makes distant objects perceptible to the driver at an earlier point in time. Studies have shown that a frequency of one to twelve initial ignitions per second, and in particular of seven initial ignitions per second, is able to make distant objects visible at a particularly early point in time. The means of generating a defined sequence of initial ignitions is preferably a triggered switch. The frequency of the defined sequence of initial ignitions is advantageously able to be set. This makes it possible for the frequency to be varied, as a function of the distance away at which an object is situated for example. By means of a timer module that is provided as an option, the generation of the flashed light can, in addition, be limited to times when critical situations occur when objects suddenly appear in the path of a motor vehicle.
In an advantageous form of the invention, at least one sensor for the early detection of objects is provided which is connected to the means of generating a defined sequence of initial ignitions. This makes it possible for the flashed light to be activated in a selective way. What are suitable for this purpose are, in particular, infrared cameras, radar devices or even ultrasonic sensors. Early detection of distant objects can be achieved with these known means without causing any visual nuisance to other road users. A distant object having been detected, a flashed light can then be initiated to make the object perceptible to the driver at an early point in time. A camera system that will continue to be suitable and that is familiar in the field of automobiles is also what is called the lidar system which, unlike radar systems, is based on light waves.
Other variants and forms of the invention are specified in the remainder of the dependent claims. An embodiment is shown in the drawing and is described in detail below. The single Figure 1 is a schematic view of a projector module of a projector headlamp. The lighting system for a motor vehicle that has been selected as an embodiment comprises a xenon lamp 1 which is arranged inside a reflector 2. The xenon lamp 1 is provided with an integrated ignition circuit 11. Arranged opposite the reflector 2 is a lens 3.
Arranged between the reflector 2 and the lens 3 are two masks 4, 5 that are able to be pivoted into the beam path of the projector headlamp by means of points of pivot 41, 51. In line with the functions they perform, the masks 4, 5 are of different forms and thus project into the beam path of the projector headlamp in different ways.
The mask 4 corresponds to the mask that is known in the prior art for bi-xenon headlamp systems, which enables a switch to be made between the "low-beam light" and "high-beam light" lighting functions. To perform the "low-beam light" function, the mask 4 is pivoted into the beam path of the projector headlamp; if the mask 4 is situated out of the beam path, then the "high-beam light" function is in operation.
The mask 5 is used to switch between daytime running light and low- beam/high-beam light. If the mask 5 is situated out of the beam path of the projector headlamp, then either the "low-beam light" or "high-beam light" function is operative, depending on the position of the mask 4. To enable the "daytime running light" function to be performed, the mask 5 is pivoted into the beam path of the projector headlamp. When the mask 5 is in this position, the mask 4 should be pivoted out of the beam path. In an expanded embodiment, a sensor for ambient brightness is provided that is connected to a control system that is set up to control the masks 4, 5. In daylight, the sensor for ambient brightness transmits an appropriate brightness signal to the mask control system, which latter positions the mask 5 in the position for the "daytime running light" function. In this configuration, the lamp 1 performs a daytime running light function which produces the desired attentiveness by having a dazzle effect on the oncoming traffic. At the same time, a dimmable ballast is provided, the supply current from which is regulated down to a lower level in daylight, thus enabling the lamp 1 to be operated at 20 watts in the embodiment.
If the sensor for ambient brightness reports that the surroundings are dark, the mask 5 is pivoted out of the beam path of the projector headlamp. At the same time, the ballast is set to a higher power, which in the embodiment enables the lamp 1 to be operated at 35 watts.
In a further embodiment, the lighting system may be fitted with a means of generating a bright flashed light to enable distant objects to be perceived at an early point in time. For this purpose, the xenon lamp 1 is connected to the ballast via a triggerable switch. The ballast of the lamp 1 is also connected to a radar sensor and, as an option, to a speed sensor. In the event of an object being detected by the radar sensor, the lamp 1 is changed to a flashed mode by means of a sequence of intermediate ignitions.
For this purpose, the ignition circuit 11 is excited at regular intervals by the triggerable switch to cause initial ignition of the lamp 1. Between the initial ignitions, the lamp 1 is not brought into a stable state of operation. Alternatively, the flashed light may also be initiated by means of a sequence of intermediate ignitions. These intermediate ignitions may for example be produced by means of a capacitor that is selectively discharged across the arc of the gas discharge lamp. To supplement this, a timer module may be provided by means of which the duration of the flashed light that is initiated can be set, to three seconds for example.

Claims

CLAIMS:
1. A lighting system for a motor vehicle, to provide three lighting functions in which the color temperature is the same, comprising a projector headlamp in which is arranged a high-pressure discharge lamp which is connected to at least one ballast, characterized in that precisely one high-pressure discharge lamp (1) is provided and the projector headlamp has two masks (4, 5) which can be moved into the beam path of the said projector headlamp.
2. A lighting system as claimed in Claim 1, characterized in that the masks (4, 5) are mounted by means of respective points of pivot (41, 51), with the points of pivot (41, 51) being arranged on opposite sides.
3. A lighting system as claimed in Claim 1 or 2, characterized in that a control unit is provided by means of which the masks (4, 5) can be actuated in such a way that the functions of daytime running light, low-beam light and high-beam light can be obtained.
4. A lighting system as claimed in any one of the preceding claims, characterized in that the ballast is designed to be dimmable.
5. A lighting system as claimed in any one of the preceding claims, characterized in that a light sensor is provided that is connected to the control unit of the masks.
6. A lighting system as claimed in any one of the preceding claims, characterized in that means are provided to generate a defined sequence of initial ignitions and/or intermediate ignitions to produce a bright flashed light.
7. A lighting system as claimed in Claim 6, characterized in that the means of generating a defined sequence of initial ignitions is a triggered switch.
8. A lighting system as claimed in Claim 6 or 7, characterized in that the frequency of the defined sequence of initial ignitions is able to be set.
9. A lighting system as claimed in any one of Claims 6 to 8, characterized in that at least one sensor for the early detection of objects is provided which is connected to the means of generating a defined sequence of initial ignitions.
10. A lighting system as claimed in Claim 9, characterized in that the at least one sensor is an infrared camera and/or a radar device.
PCT/IB2008/053810 2007-09-25 2008-09-19 Lighting system for a motor vehicle WO2009040710A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07117161.5 2007-09-25
EP07117161 2007-09-25

Publications (2)

Publication Number Publication Date
WO2009040710A2 true WO2009040710A2 (en) 2009-04-02
WO2009040710A3 WO2009040710A3 (en) 2009-09-24

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PCT/IB2008/053810 WO2009040710A2 (en) 2007-09-25 2008-09-19 Lighting system for a motor vehicle

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150092436A1 (en) * 2013-09-27 2015-04-02 Valeo Lighting Systems North America, Llc Multi-function led headlamp

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5339226A (en) * 1992-06-03 1994-08-16 Koito Manufacturing Co., Ltd. Projection head lamp for cars
DE4435446A1 (en) * 1994-03-18 1995-09-21 Bosch Gmbh Robert Motor vehicle headlamp
EP1422472A2 (en) * 2002-11-21 2004-05-26 Valeo Vision Elliptical vehicle headlamp emitting different light beams
US20040136200A1 (en) * 2002-12-20 2004-07-15 Patrice Bos Motor vehicle headlight with at least two functions
EP1466782A2 (en) * 2003-04-11 2004-10-13 Valeo Vision Multifunction headlamp assembly for motor vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5339226A (en) * 1992-06-03 1994-08-16 Koito Manufacturing Co., Ltd. Projection head lamp for cars
DE4435446A1 (en) * 1994-03-18 1995-09-21 Bosch Gmbh Robert Motor vehicle headlamp
EP1422472A2 (en) * 2002-11-21 2004-05-26 Valeo Vision Elliptical vehicle headlamp emitting different light beams
US20040136200A1 (en) * 2002-12-20 2004-07-15 Patrice Bos Motor vehicle headlight with at least two functions
EP1466782A2 (en) * 2003-04-11 2004-10-13 Valeo Vision Multifunction headlamp assembly for motor vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150092436A1 (en) * 2013-09-27 2015-04-02 Valeo Lighting Systems North America, Llc Multi-function led headlamp
US9416933B2 (en) * 2013-09-27 2016-08-16 Valeo North America, Inc. Multi-function LED headlamp

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