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WO2020108761A1 - Headlamp for a vehicle, vehicle with a headlamp and method of driving a headlamp - Google Patents

Headlamp for a vehicle, vehicle with a headlamp and method of driving a headlamp Download PDF

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Publication number
WO2020108761A1
WO2020108761A1 PCT/EP2018/083021 EP2018083021W WO2020108761A1 WO 2020108761 A1 WO2020108761 A1 WO 2020108761A1 EP 2018083021 W EP2018083021 W EP 2018083021W WO 2020108761 A1 WO2020108761 A1 WO 2020108761A1
Authority
WO
WIPO (PCT)
Prior art keywords
headlamp
vehicle
predefined
control unit
light pattern
Prior art date
Application number
PCT/EP2018/083021
Other languages
French (fr)
Inventor
Marius Stefanescu
Original Assignee
HELLA GmbH & Co. KGaA
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 HELLA GmbH & Co. KGaA filed Critical HELLA GmbH & Co. KGaA
Priority to PCT/EP2018/083021 priority Critical patent/WO2020108761A1/en
Publication of WO2020108761A1 publication Critical patent/WO2020108761A1/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
    • B60Q1/06—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle
    • B60Q1/08—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically
    • B60Q1/085—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically due to special conditions, e.g. adverse weather, type of road, badly illuminated road signs or potential dangers
    • 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
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/50—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating other intentions or conditions, e.g. request for waiting or overtaking
    • B60Q1/547—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating other intentions or conditions, e.g. request for waiting or overtaking for issuing requests to other traffic participants; for confirming to other traffic participants they can proceed, e.g. they can overtake
    • 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
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/50—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating other intentions or conditions, e.g. request for waiting or overtaking
    • B60Q1/509—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating other intentions or conditions, e.g. request for waiting or overtaking specific to unauthorised use, e.g. for indicating stolen vehicles or infringements of traffic rules
    • 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
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/50—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating other intentions or conditions, e.g. request for waiting or overtaking
    • B60Q1/545—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating other intentions or conditions, e.g. request for waiting or overtaking for indicating other traffic conditions, e.g. fog, heavy traffic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/10—Indexing codes relating to particular vehicle conditions
    • B60Q2300/11—Linear movements of the vehicle
    • B60Q2300/114—Vehicle acceleration or deceleration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/10—Indexing codes relating to particular vehicle conditions
    • B60Q2300/11—Linear movements of the vehicle
    • B60Q2300/116—Vehicle at a stop
    • 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
    • B60Q2400/00—Special features or arrangements of exterior signal lamps for vehicles
    • B60Q2400/50—Projected symbol or information, e.g. onto the road or car body

Definitions

  • the present invention relates to a headlamp for a vehicle according to the preamble of claim 1 , a vehicle with a headlamp according to the preamble of claim 7 and a method of driving a headlamp for a vehicle according to the preamble of claim 8.
  • Such headlamps for vehicles, vehicles with headlamps and methods of driving head lamps for vehicles are already well known in different embodiments.
  • DE 10 2015 012 41 6 A1 discloses a vehicle and a headlamp for a vehi cle, comprising a light module designed and configured to project at least one prede fined light pattern for an information of a traffic participant onto a projection surface po sitioned outside said vehicle in an assembly state of said headlamp in which said headlamp is assembled ready-to-use to said vehicle, whereat said at least one prede fined light pattern is projectable by means of said light module according to a trigger signal from a control unit of said vehicle and an output signal of at least one accelera tion sensor.
  • the DE 10 2015 012 41 6 A1 discloses a method of driving this headlamp, projecting at least one predefined light pattern for an information of a traffic participant onto a projection surface positioned outside said vehicle in an as sembly state of said headlamp, in which said headlamp is assembled ready-to-use to said vehicle, by means of a light module of said headlamp, whereat said at least one predefined light pattern is projected by means of said light module according to a trig ger signal from a control unit of said vehicle and an output signal of at least one accel eration sensor.
  • a headlamp for a vehicle wherein said at least one acceleration sensor is incorporated into said headlamp, whereat said head lamp comprises a headlamp control unit which is designed and configured to compare said output signal of said at least one acceleration sensor with at least one reference value corresponding to a predefined motion of said headlamp, and whereat said head lamp control unit is designed and configured to trigger said at least one predefined light pattern to be projected by means of said light module according to said compari son.
  • traffic participant comprises all kinds of traffic participants, like a driver of the ego-vehicle, in which the invention is incorporated, drivers of other vehicles, bik ers, cyclists and pedestrians.
  • This object is also solved by a vehicle with a headlamp according to claim 7 and by a method of driving a headlamp for a vehicle according to claim 8, wherein said output signal of said at least one acceleration sensor is compared with at least one reference value corresponding to a predefined motion of said headlamp by means of a head lamp control unit of said headlamp, whereat said projection of said at least one prede fined light pattern by means of said light module is triggered by a trigger signal of said headlamp control unit according to said comparison.
  • a main advantage of the invention is, that a predefined light pattern of a vehicle for an information of a traffic participant is projected onto a projection surface outside the ve hicle ensuring, that the law is obeyed and the safety of traffic participants is not endan gered.
  • such a projected light pattern could be configured as a projection of a crosswalk, namely a zebra, in or der to invite pedestrians to cross in front of the vehicle. It would be very dangerous and maybe fatal, if the zebra would be projected by the light module of the headlamp of the vehicle, while the car would still be in motion.
  • a technical solution for realizing such a projection of a light pattern onto a projection surface outside the vehi cle would be against the law, too. Because of the invention, on the one hand, such light patterns with restricted usage can be used without the hazard of endangering somebody.
  • the final triggering of said at least one predefined light pattern by means of said headlamp control unit yields an extra security level against attacks.
  • the quality of the comparison of the output signal of the at least one ac celeration sensor and the at least one reference value corresponding to a predefined motion of the headlamp is enhanced due to the fact, that the at least one acceleration sensor is incorporated into the headlamp.
  • the motion of the headlamp is meas ured directly and not indirectly by means of an acceleration sensor positioned some where in the vehicle.
  • the at least one ac celeration sensor is independent and electrically isolated from any other inertial meas urement device incorporated within the vehicle.
  • the at least one acceleration sensor incorporated into the headlamp can be of any useful and suitable type, design, material, dimension and arrangement.
  • the at least one acceleration sensor is designed as a three-axis accelera tion sensor. That way, only one acceleration sensor is needed for measuring the ac celeration of the headlamp in all three spatial directions.
  • such an accelera tion sensor can be placed somewhere in the headlamp without affecting the proper function of the acceleration sensor. Therefore, the design of the inventive headlamp is less influenced by the incorporation of the acceleration sensor.
  • said headlamp comprises a headlamp memory for control data for driving said light module to project said at least one predefined light pattern.
  • control data necessary for driving said light module of said headlamp to project said at least one predefined light pattern does not have to be generated and transmitted in real time as live pixel data for projection from a unit located away from the headlamp in the vehicle, but rather be pulled as a static predefined light pattern from the headlamp it self.
  • a low-bandwidth channel like a CAN-bus, can be used for transmitting said trigger signal from said control unit of said vehicle to said headlamp control unit of said headlamp.
  • a standard channel is significantly more cost-efficient compared to a Gigabit-Ethernet or equivalent high-bandwidth channels, too.
  • control data for driving said light module to project said at least one predefined light pattern is recorded into a head lamp memory of said headlamp and pulled by said trigger signal from said headlamp control unit of said headlamp.
  • the term“recorded” is equal to“factory-recorded”.
  • the headlamp memory is designed and configured as a read-only memory.
  • the headlamp memory is designed as a non-volatile memory. That way, the safety against attacks or modifications of said at least one predefined light pattern recorded in the headlamp memory is improved with a minimum of effort.
  • headlamp memory is designed and configured as a flash memory.
  • a flash memory is flexible, therefore allowing modifications of said at least one predefined light pattern recorded in the headlamp memory.
  • said headlamp memory comprises a safeguard for granting access to write to said headlamp memory accord ing to predefined access conditions.
  • said access to write could be granted solely to the manufacturer of the vehicle or to service providers certified by said manufacturer.
  • a further advantageous development of the method of driving a headlamp for a vehi cle according to the invention is, that a warning light pattern of said at least one prede fined light pattern comprising at least two predefined light patterns is projected by means of said light module according to an attack to said control unit of said vehicle.
  • a user of said vehicle for example a driver of said vehicle, can be informed and warned about said attack to said control unit of said vehicle without any further equipment.
  • said light module can be triggered by means of said head lamp control unit to project a certain predefined light pattern in order to inform about an emergency due to said attack of said control unit of said vehicle.
  • Said certain pre defined light pattern could be configured as a steady light pattern or a flashing light pattern. For example, like a S.O.S. function in certain LED flashlights.
  • attacks are cyber-attacks in this context.
  • FIG. 1 is a schematic illustration of a headlamp according to the present invention, wherein only the details necessary for the understanding of the invention are displayed. It is shown by:
  • Fig. 1 an embodiment of a vehicle according to the invention with a headlamp ac cording to the invention in a partial view.
  • Fig. 1 displays an embodiment of a vehicle 2 according to the invention with a head lamp 4 for said vehicle 2 according to the invention in a partial view.
  • Said vehicle 2 is built as a passenger car 2.
  • Said headlamp 4 comprises a light module 6 designed and configured to project at least one predefined light pattern 8 for an information of a traf fic participant 10 onto a projection surface 12 positioned outside said vehicle 2 in an assembly state of said headlamp 4 in which said headlamp 4 is assembled ready-to- use to said vehicle 2, whereat said at least one predefined light pattern 8 is projectable by means of said light module 6 according to a trigger signal from a control unit 14 of said vehicle 2 and an output signal of at least one acceleration sensor 1 6.
  • Said light module 6 comprises multiple LED’s arranged in an array. Said array as well as said LED’s itself are not displayed.
  • Said light module 6 is designed and configured to project multiple predefined light pat terns 8 on said projection surface 12, whereat said predefined light patterns 8 com prise light patterns 8 for restricted use, also called restricted predefined light patterns 8, as well as light patterns 8 for non-restricted use, also called non-restricted prede fined light patterns 8.
  • Light patterns 8 for restricted use may comprise light patterns only applicable for said vehicle 2 at a standstill and/or light patterns applicable for said vehicle 2 on the move.
  • Light patterns 8 for non-restricted use may comprise light pat terns 8 applicable for said vehicle 2 in every mode of said vehicle 2, standstill or on the move.
  • said light patterns 8 applicable for said vehicle 2 at a standstill may comprise a zebra 8 and/or a warning light pattern of said at least one predefined light pattern 8 comprising at least two predefined light patterns 8, whereat said warn ing light pattern is projected by means of said light module 6 according to an attack to said control unit 14 of said vehicle 2.
  • Said projection surface 12 positioned outside said vehicle 2 is embodied as a street said vehicle 2 is driving on.
  • Said traffic partici pant 10 in this embodiment is embodied as a pedestrian 10, who wants to cross said street 12.
  • Said control unit 14 of said vehicle 2 is designed and configured as a body control module of said vehicle 2.
  • Said at least one acceleration sensor 16 is built as a three-axis acceleration sensor 16 which is incorporated into said headlamp 4. Furthermore, said headlamp 4 comprises a headlamp control unit 18 which is designed and configured to compare said output signal of said at least one acceleration sensor 16 with at least one reference value corresponding to a predefined motion of said headlamp 4, and whereat said headlamp control unit 18 is designed and configured to trigger said at least one predefined light pattern 8 for restricted use to be projected by means of said light module 6 according to said comparison. Said headlamp control unit 18 is connected by wire with said con trol unit 14 of said vehicle 2, said acceleration sensor 16 and said light module 6 in or der to exchange electrical signals and data.
  • a headlamp memory 20 is integrated for recording control data for driving said light module 6 to project said at least one predefined light pattern 8.
  • Said headlamp memory 20 is designed and configured as a read-only memory.
  • said headlamp memory 20 is a non-volatile memory. Recorded control data for driving said light module 6 to project said at least one predefined light pattern 8 can only be read, but not modified.
  • a user namely a driver of said vehicle 2, is driving with said vehicle 2 along said street 12 at nighttime with said headlamp 4 on.
  • Said pedestrian 10 is approaching a shoulder of said street 12 and wants to cross said street 12 in front of said vehicle 2 of said user.
  • Said user of said vehicle 2 recognizes said pedestrian 10 and decelerates said vehicle 2 until said vehicle 2 is at a standstill before said vehicle 2 approaches a position of said pedestrian 10.
  • said zebra 8 is automatically activated on said pro jection surface 12 in front of said vehicle 2, cleared for said projection by one or more inertial measurement units (IMUs) incorporated in said vehicle 2.
  • IMUs are not displayed but known in the art and connected to said control unit 14 of said vehicle 2 in a signal transmitting manner.
  • said control unit 14 of said vehicle 2 outputs said trigger signal to said headlamp control unit 18 in order to project said zebra 8 on said projection surface 12 by means of said light module 6.
  • Said zebra 8 is one of said restricted light patterns 8 which are not allowed to be projected while said vehicle 2 is moving.
  • Said acceleration sensor 16 of said headlamp 4 generates an output signal to said headlamp control unit 18 corresponding to said standstill of said vehicle 2.
  • Said output signal of said acceleration sensor 16 is compared with said reference value corresponding to a predefined motion of said headlamp 4, namely a zero movement of said headlamp 4 necessary for triggering said projection of said zebra 8 by means of said headlamp control unit 18.
  • said control data necessary for driving said light mod ule 6 in order to project said zebra 8 onto said projection surface 12 are pulled from said headlamp memory 20 by means of a trigger signal of said headlamp control unit 18 and employed for projecting said zebra 8 as predefined and recorded in said head lamp memory 20.
  • said output signal of said accelera tion sensor 16 matches said reference value of said predefined motion of said head lamp 4 and said projection of said zebra 8 by means of said light module 6 is triggered by said trigger signal from said headlamp control unit 18.
  • said trigger signal from said control unit 14 of said vehicle 2 due to said activation originating from said IMUs of said vehicle 2 does not trigger said zebra 8 as one of said restricted light patterns 8 directly, but indirectly by means of said trigger signal of said headlamp control unit 18 according to said comparison of said output signal of said acceleration sensor 16 and said reference value.
  • said actual standstill of said vehicle 2 combined with said output from said IMUs of said vehicle 2 causes said projection of said zebra 8 by means of said light module 6 of said headlamp 4, inviting said pedestrian 10 to cross said street 12 in front of said vehicle 2 by walking along said projection of said predefined light pattern 8 onto said projection surface 12, namely said street 12.
  • said trigger sig nal from said control unit 14 of said vehicle 2 caused by said IMUs' clearance would not work out to project said zebra 8 onto said projection surface 12, because of said comparison of said output signal of said acceleration sensor 16, namely an actual movement of said headlamp of unequal zero acceleration, would not match to said ref erence value, namely a required motion of said headlamp 4 of equal zero motion for triggering said projection of said zebra 8 by means of said trigger signal of said head lamp control unit 18.
  • said headlamp control unit 18 would not trigger said projec tion of said zebra 8 by means of said light module 6.
  • said zebra 8 is just exemplary for a lot of different restricted predefined light patterns 8 for a lot of different use cases and traffic situations possible. Furthermore, besides at least one of said restricted predefined light pattern 8 a lot of different non- restricted predefined light patterns 8 are possible, too.
  • said projection of said predefined light patterns 8 of non-restricted use does not depend on said output signal of said acceleration sensor 16.
  • said predefined light patterns 8 of non-restricted use are projected by means of said light module 6 solely due to said trigger signal from said control unit 14 of said vehicle 2 to said headlamp control unit 18 of said headlamp 4.
  • Said control data necessary for pro jecting said predefined light patterns 8 of non-restricted use are pulled from said head lamp memory 20 by means of said trigger signal of said headlamp control unit 18 based on said trigger signal of said control unit 14 of said vehicle 2 without comparing said output signal of said acceleration sensor 16 with said reference value.
  • said trigger signal from said control unit 15 of said vehicle 2 to project a predefined light pattern, too.
  • generating said trig ger signal from said control unit 14 of said vehicle 2 solely based on vehicle data like output signals from said at least one vehicle sensor is quite comfortable and prevents misuse by said user of said vehicle 2.
  • no input from said user of said vehicle 2 is necessary at all.
  • Such a technical realization suits especially autonomous vehicles.
  • the term“autonomous vehicles” comprises all types of autonomous vehicles and in cludes semi-autonomous vehicles, too.
  • one of said predefined light patterns 8 recorded in said headlamp memory 20 is configured as a warning light pattern which is projected by means of said light module 6 in response to an attack to said control unit 14 of said vehicle 2.
  • Said warning light pattern is not shown in Fig. 1.
  • Said attack on said control unit 14 of said vehicle 2 is inherently detectable as follows: In case of an attack to said control unit 14 of said vehicle 2, a trigger signal of said control unit 14 of said vehicle 2 is transferred to said headlamp control unit 18.
  • said warning light pattern is also a restricted predefined light pattern 8 solely applicable at a stand still of said vehicle 2
  • said output signal of said acceleration sensor 16 is compared to said reference value corresponding to a predefined motion of said headlamp 4, namely a zero movement of said headlamp 4 necessary for triggering said projection of said warning light patter 8 by means of said headlamp control unit 18.
  • said control data necessary for driving said light module 6 in order to project said warning light pat tern onto said projection surface 12 is pulled from said headlamp memory 20 and em ployed for projecting said warning light pattern as predefined and recorded in said headlamp memory 20.
  • said warning light pattern could be a certain predefined light pattern 8 in order to inform about an emergency due to said attack of said control unit 14 of said vehicle 2.
  • Said certain predefined light pattern 8 could be configured as a steady light pattern or a flashing light pattern.
  • the invention is not limited to the exemplary embodiment of the invention.
  • the invention can be used advantageously for other types of vehicles, too.
  • the implementation of the invention requires no mechanical modifications pertaining to size, fit or weight in comparison to existing headlamps already known in the art.
  • the at least one predefined light pattern can be of any useful and suitable type and number.
  • said at least one reference value for the comparison with the out put signal of the at least one acceleration sensor could correspond to a weather condition, a condition of the street or road the vehicle is driving on, a speed limit, a suggested direction to move and other useful and suitable information for at least one traffic participant.
  • a three-axis acceleration sensor other types and numbers of at least one acceleration sensor are possible.
  • a sepa rate acceleration sensor could be used for each spatial direction.
  • said headlamp memory could be designed and configured as a flash memory, especially as a flash memory com prising a safeguard for granting access to write to said headlamp memory according to predefined access conditions.
  • a flash memory is flexible, therefore allowing modifica tions of said at least one predefined light pattern recorded in the headlamp memory.
  • a safeguard prevents from attacks or unwanted modifications of said at least one prede fined light pattern recorded in the headlamp memory.
  • access to write to the headlamp memory designed and configured as a flash memory is granted according to prede fined access conditions. For example, said access to write could be granted solely to the manufacturer of the vehicle or to service providers certified by said manufacturer.
  • a user of the vehicle is activating a switch of the vehicle in order to generate a trigger signal from the control unit of the vehicle to project a predefined light pattern on the projection surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

Headlamp (4) for a vehicle (2), comprising a light module (6) designed and configured to project at least one predefined light pattern (8) for an information of a traffic participant (10) onto a projection surface (12) positioned outside said vehicle (2) in an assembly state of said headlamp (4) in which said headlamp (4) is assembled ready-to-use to said vehicle (2), whereat said at least one predefined light pattern (8) is projectable by means of said light module (6) according to a trigger signal from a control unit (14) of said vehicle (2) and an output signal of at least one acceleration sensor (16). In order to ensure, that a predefined light pattern (8) of a vehicle (2) for an information of a traffic participant (10) is projected onto a projection surface (12) outside the vehicle (2) without violating the law or endangering the safety of traffic participants (10), said at least one acceleration sensor (16) is incorporated into said headlamp (4), whereat said headlamp (4) comprises a headlamp control unit (18) which is designed and configured to compare said output signal of said at least one acceleration sensor (16) with at least one reference value corresponding to a predefined motion of said headlamp (4), and whereat said headlamp control unit (18) is designed and configured to trigger said at least one predefined light pattern (8) to be projected by means of said light module (6) according to said comparison.

Description

Headlamp for a vehicle, vehicle with a headlamp and method of driving a headlamp
Description
The present invention relates to a headlamp for a vehicle according to the preamble of claim 1 , a vehicle with a headlamp according to the preamble of claim 7 and a method of driving a headlamp for a vehicle according to the preamble of claim 8.
Such headlamps for vehicles, vehicles with headlamps and methods of driving head lamps for vehicles are already well known in different embodiments.
For example, DE 10 2015 012 41 6 A1 discloses a vehicle and a headlamp for a vehi cle, comprising a light module designed and configured to project at least one prede fined light pattern for an information of a traffic participant onto a projection surface po sitioned outside said vehicle in an assembly state of said headlamp in which said headlamp is assembled ready-to-use to said vehicle, whereat said at least one prede fined light pattern is projectable by means of said light module according to a trigger signal from a control unit of said vehicle and an output signal of at least one accelera tion sensor. Furthermore, the DE 10 2015 012 41 6 A1 discloses a method of driving this headlamp, projecting at least one predefined light pattern for an information of a traffic participant onto a projection surface positioned outside said vehicle in an as sembly state of said headlamp, in which said headlamp is assembled ready-to-use to said vehicle, by means of a light module of said headlamp, whereat said at least one predefined light pattern is projected by means of said light module according to a trig ger signal from a control unit of said vehicle and an output signal of at least one accel eration sensor.
It is an object of the invention to ensure, that a predefined light pattern of a vehicle for an information of a traffic participant is projected onto a projection surface outside the vehicle without violating the law or endangering the safety of traffic participants. This object is solved by a headlamp for a vehicle according to claim 1 , wherein said at least one acceleration sensor is incorporated into said headlamp, whereat said head lamp comprises a headlamp control unit which is designed and configured to compare said output signal of said at least one acceleration sensor with at least one reference value corresponding to a predefined motion of said headlamp, and whereat said head lamp control unit is designed and configured to trigger said at least one predefined light pattern to be projected by means of said light module according to said compari son. The term traffic participant comprises all kinds of traffic participants, like a driver of the ego-vehicle, in which the invention is incorporated, drivers of other vehicles, bik ers, cyclists and pedestrians.
This object is also solved by a vehicle with a headlamp according to claim 7 and by a method of driving a headlamp for a vehicle according to claim 8, wherein said output signal of said at least one acceleration sensor is compared with at least one reference value corresponding to a predefined motion of said headlamp by means of a head lamp control unit of said headlamp, whereat said projection of said at least one prede fined light pattern by means of said light module is triggered by a trigger signal of said headlamp control unit according to said comparison.
A main advantage of the invention is, that a predefined light pattern of a vehicle for an information of a traffic participant is projected onto a projection surface outside the ve hicle ensuring, that the law is obeyed and the safety of traffic participants is not endan gered. By comparing said output signal of said at least one acceleration sensor with at least one reference value corresponding to a predefined motion of said headlamp it is ensured, that a light pattern for an information of a traffic participant which is solely ap plicable during a standstill of the vehicle equipped with the invention, namely the ego- vehicle, will only be projected by means of the light module of the inventive headlamp of the vehicle, if the vehicle is not moving any longer. For example, such a projected light pattern could be configured as a projection of a crosswalk, namely a zebra, in or der to invite pedestrians to cross in front of the vehicle. It would be very dangerous and maybe fatal, if the zebra would be projected by the light module of the headlamp of the vehicle, while the car would still be in motion. Of course, a technical solution for realizing such a projection of a light pattern onto a projection surface outside the vehi cle would be against the law, too. Because of the invention, on the one hand, such light patterns with restricted usage can be used without the hazard of endangering somebody. On the other hand, the final triggering of said at least one predefined light pattern by means of said headlamp control unit yields an extra security level against attacks. In this context, attacks are cyber-attacks. Thus, vandalism is not the threat the invention is dealing with. Even if said control unit of said vehicle has been successfully attacked, a permitted projection of said at least one predefined light pattern is still se cured by said headlamp control unit of said headlamp as determined by said at least one acceleration sensor of said headlamp.
Furthermore, the quality of the comparison of the output signal of the at least one ac celeration sensor and the at least one reference value corresponding to a predefined motion of the headlamp is enhanced due to the fact, that the at least one acceleration sensor is incorporated into the headlamp. Thus, the motion of the headlamp is meas ured directly and not indirectly by means of an acceleration sensor positioned some where in the vehicle. In a preferred embodiment of the invention, the at least one ac celeration sensor is independent and electrically isolated from any other inertial meas urement device incorporated within the vehicle.
Basically, the at least one acceleration sensor incorporated into the headlamp can be of any useful and suitable type, design, material, dimension and arrangement. Advan tageously, the at least one acceleration sensor is designed as a three-axis accelera tion sensor. That way, only one acceleration sensor is needed for measuring the ac celeration of the headlamp in all three spatial directions. Moreover, such an accelera tion sensor can be placed somewhere in the headlamp without affecting the proper function of the acceleration sensor. Therefore, the design of the inventive headlamp is less influenced by the incorporation of the acceleration sensor.
A further advantageous development of the headlamp according to the invention is, that said headlamp comprises a headlamp memory for control data for driving said light module to project said at least one predefined light pattern. Hereby, the control data necessary for driving said light module of said headlamp to project said at least one predefined light pattern does not have to be generated and transmitted in real time as live pixel data for projection from a unit located away from the headlamp in the vehicle, but rather be pulled as a static predefined light pattern from the headlamp it self. It is only necessary to send a trigger signal from said control unit of said vehicle to said headlamp control unit in order to pull said control data required for projecting said at least one predefined light pattern by means of said light module of said head lamp, if all other requirements for projecting said at least one predefined light pattern are met, too. Therefore, the data necessary to be send from said control unit of said vehicle to said headlamp control unit is reduced to a minimum. Thus, a low-bandwidth channel, like a CAN-bus, can be used for transmitting said trigger signal from said control unit of said vehicle to said headlamp control unit of said headlamp. Such a standard channel is significantly more cost-efficient compared to a Gigabit-Ethernet or equivalent high-bandwidth channels, too.
The same is true for an advantageous development of the method of driving a head lamp for a vehicle according to the invention, wherein control data for driving said light module to project said at least one predefined light pattern is recorded into a head lamp memory of said headlamp and pulled by said trigger signal from said headlamp control unit of said headlamp. In a preferred development of this embodiment of the inventive method, the term“recorded” is equal to“factory-recorded”. Thus, the security level against attacks is further improved.
An advantageous development of the headlamp according to the aforementioned em bodiment is, that said headlamp memory is designed and configured as a read-only memory. Thus, the headlamp memory is designed as a non-volatile memory. That way, the safety against attacks or modifications of said at least one predefined light pattern recorded in the headlamp memory is improved with a minimum of effort.
An alternative advantageous development of the headlamp with a headlamp memory is, that said headlamp memory is designed and configured as a flash memory. A flash memory is flexible, therefore allowing modifications of said at least one predefined light pattern recorded in the headlamp memory.
In order to prevent attacks or unwanted modifications of said at least one predefined light pattern recorded in the headlamp memory an advantageous development of the headlamp according to the last mentioned embodiment is, that said headlamp memory comprises a safeguard for granting access to write to said headlamp memory accord ing to predefined access conditions. For example, said access to write could be granted solely to the manufacturer of the vehicle or to service providers certified by said manufacturer.
The same is true for an advantageous development of the method of driving a head lamp for a vehicle according to the invention, wherein access to write to said head lamp memory designed and configured as a flash memory is granted according to pre defined access conditions.
A further advantageous development of the method of driving a headlamp for a vehi cle according to the invention is, that a warning light pattern of said at least one prede fined light pattern comprising at least two predefined light patterns is projected by means of said light module according to an attack to said control unit of said vehicle. Hereby, a user of said vehicle, for example a driver of said vehicle, can be informed and warned about said attack to said control unit of said vehicle without any further equipment. For example, said light module can be triggered by means of said head lamp control unit to project a certain predefined light pattern in order to inform about an emergency due to said attack of said control unit of said vehicle. Said certain pre defined light pattern could be configured as a steady light pattern or a flashing light pattern. For example, like a S.O.S. function in certain LED flashlights. As already stated above, attacks are cyber-attacks in this context.
The figure is a schematic illustration of a headlamp according to the present invention, wherein only the details necessary for the understanding of the invention are displayed. It is shown by:
Fig. 1 an embodiment of a vehicle according to the invention with a headlamp ac cording to the invention in a partial view.
Fig. 1 displays an embodiment of a vehicle 2 according to the invention with a head lamp 4 for said vehicle 2 according to the invention in a partial view. Said vehicle 2 is built as a passenger car 2. Said headlamp 4 comprises a light module 6 designed and configured to project at least one predefined light pattern 8 for an information of a traf fic participant 10 onto a projection surface 12 positioned outside said vehicle 2 in an assembly state of said headlamp 4 in which said headlamp 4 is assembled ready-to- use to said vehicle 2, whereat said at least one predefined light pattern 8 is projectable by means of said light module 6 according to a trigger signal from a control unit 14 of said vehicle 2 and an output signal of at least one acceleration sensor 1 6. Said light module 6 comprises multiple LED’s arranged in an array. Said array as well as said LED’s itself are not displayed.
Said light module 6 is designed and configured to project multiple predefined light pat terns 8 on said projection surface 12, whereat said predefined light patterns 8 com prise light patterns 8 for restricted use, also called restricted predefined light patterns 8, as well as light patterns 8 for non-restricted use, also called non-restricted prede fined light patterns 8. Light patterns 8 for restricted use may comprise light patterns only applicable for said vehicle 2 at a standstill and/or light patterns applicable for said vehicle 2 on the move. Light patterns 8 for non-restricted use may comprise light pat terns 8 applicable for said vehicle 2 in every mode of said vehicle 2, standstill or on the move. For example, said light patterns 8 applicable for said vehicle 2 at a standstill may comprise a zebra 8 and/or a warning light pattern of said at least one predefined light pattern 8 comprising at least two predefined light patterns 8, whereat said warn ing light pattern is projected by means of said light module 6 according to an attack to said control unit 14 of said vehicle 2. Said projection surface 12 positioned outside said vehicle 2 is embodied as a street said vehicle 2 is driving on. Said traffic partici pant 10 in this embodiment is embodied as a pedestrian 10, who wants to cross said street 12. Said control unit 14 of said vehicle 2 is designed and configured as a body control module of said vehicle 2.
Said at least one acceleration sensor 16 is built as a three-axis acceleration sensor 16 which is incorporated into said headlamp 4. Furthermore, said headlamp 4 comprises a headlamp control unit 18 which is designed and configured to compare said output signal of said at least one acceleration sensor 16 with at least one reference value corresponding to a predefined motion of said headlamp 4, and whereat said headlamp control unit 18 is designed and configured to trigger said at least one predefined light pattern 8 for restricted use to be projected by means of said light module 6 according to said comparison. Said headlamp control unit 18 is connected by wire with said con trol unit 14 of said vehicle 2, said acceleration sensor 16 and said light module 6 in or der to exchange electrical signals and data.
In said headlamp control unit 18 a headlamp memory 20 is integrated for recording control data for driving said light module 6 to project said at least one predefined light pattern 8. Said headlamp memory 20 is designed and configured as a read-only memory. Thus, said headlamp memory 20 is a non-volatile memory. Recorded control data for driving said light module 6 to project said at least one predefined light pattern 8 can only be read, but not modified.
The function of said vehicle 2 according to the aforementioned embodiment of the in vention with said headlamp 4 as well as the inventive method are explained as fol lows:
A user, namely a driver of said vehicle 2, is driving with said vehicle 2 along said street 12 at nighttime with said headlamp 4 on. Said pedestrian 10 is approaching a shoulder of said street 12 and wants to cross said street 12 in front of said vehicle 2 of said user. Said user of said vehicle 2 recognizes said pedestrian 10 and decelerates said vehicle 2 until said vehicle 2 is at a standstill before said vehicle 2 approaches a position of said pedestrian 10. At that point, said zebra 8 is automatically activated on said pro jection surface 12 in front of said vehicle 2, cleared for said projection by one or more inertial measurement units (IMUs) incorporated in said vehicle 2. Said IMUs are not displayed but known in the art and connected to said control unit 14 of said vehicle 2 in a signal transmitting manner. As such, said control unit 14 of said vehicle 2 outputs said trigger signal to said headlamp control unit 18 in order to project said zebra 8 on said projection surface 12 by means of said light module 6. Said zebra 8 is one of said restricted light patterns 8 which are not allowed to be projected while said vehicle 2 is moving. Said acceleration sensor 16 of said headlamp 4 generates an output signal to said headlamp control unit 18 corresponding to said standstill of said vehicle 2. Said output signal of said acceleration sensor 16 is compared with said reference value corresponding to a predefined motion of said headlamp 4, namely a zero movement of said headlamp 4 necessary for triggering said projection of said zebra 8 by means of said headlamp control unit 18. In the case of a standstill of said vehicle 2, thus at zero movement of said headlamp 4, said control data necessary for driving said light mod ule 6 in order to project said zebra 8 onto said projection surface 12 are pulled from said headlamp memory 20 by means of a trigger signal of said headlamp control unit 18 and employed for projecting said zebra 8 as predefined and recorded in said head lamp memory 20.
Because of said actual standstill of said vehicle 2, said output signal of said accelera tion sensor 16 matches said reference value of said predefined motion of said head lamp 4 and said projection of said zebra 8 by means of said light module 6 is triggered by said trigger signal from said headlamp control unit 18. Thus, said trigger signal from said control unit 14 of said vehicle 2 due to said activation originating from said IMUs of said vehicle 2 does not trigger said zebra 8 as one of said restricted light patterns 8 directly, but indirectly by means of said trigger signal of said headlamp control unit 18 according to said comparison of said output signal of said acceleration sensor 16 and said reference value. According to the aforementioned embodiment of the invention, said actual standstill of said vehicle 2 combined with said output from said IMUs of said vehicle 2 causes said projection of said zebra 8 by means of said light module 6 of said headlamp 4, inviting said pedestrian 10 to cross said street 12 in front of said vehicle 2 by walking along said projection of said predefined light pattern 8 onto said projection surface 12, namely said street 12.
In another case, in which said vehicle 2 is not at a complete standstill, said trigger sig nal from said control unit 14 of said vehicle 2 caused by said IMUs' clearance would not work out to project said zebra 8 onto said projection surface 12, because of said comparison of said output signal of said acceleration sensor 16, namely an actual movement of said headlamp of unequal zero acceleration, would not match to said ref erence value, namely a required motion of said headlamp 4 of equal zero motion for triggering said projection of said zebra 8 by means of said trigger signal of said head lamp control unit 18. Thus, said headlamp control unit 18 would not trigger said projec tion of said zebra 8 by means of said light module 6.
Of course, said zebra 8 is just exemplary for a lot of different restricted predefined light patterns 8 for a lot of different use cases and traffic situations possible. Furthermore, besides at least one of said restricted predefined light pattern 8 a lot of different non- restricted predefined light patterns 8 are possible, too. Unlike predefined light patterns 8 of restricted use said projection of said predefined light patterns 8 of non-restricted use does not depend on said output signal of said acceleration sensor 16. Thus, said predefined light patterns 8 of non-restricted use are projected by means of said light module 6 solely due to said trigger signal from said control unit 14 of said vehicle 2 to said headlamp control unit 18 of said headlamp 4. Said control data necessary for pro jecting said predefined light patterns 8 of non-restricted use are pulled from said head lamp memory 20 by means of said trigger signal of said headlamp control unit 18 based on said trigger signal of said control unit 14 of said vehicle 2 without comparing said output signal of said acceleration sensor 16 with said reference value. Of course, there are other ways to generate said trigger signal from said control unit 15 of said vehicle 2 to project a predefined light pattern, too. But generating said trig ger signal from said control unit 14 of said vehicle 2 solely based on vehicle data like output signals from said at least one vehicle sensor is quite comfortable and prevents misuse by said user of said vehicle 2. Thus, no input from said user of said vehicle 2 is necessary at all. Such a technical realization suits especially autonomous vehicles. The term“autonomous vehicles” comprises all types of autonomous vehicles and in cludes semi-autonomous vehicles, too.
As already mentioned above, one of said predefined light patterns 8 recorded in said headlamp memory 20 is configured as a warning light pattern which is projected by means of said light module 6 in response to an attack to said control unit 14 of said vehicle 2. Said warning light pattern is not shown in Fig. 1. Said attack on said control unit 14 of said vehicle 2 is inherently detectable as follows: In case of an attack to said control unit 14 of said vehicle 2, a trigger signal of said control unit 14 of said vehicle 2 is transferred to said headlamp control unit 18. Because of the fact, that said warning light pattern is also a restricted predefined light pattern 8 solely applicable at a stand still of said vehicle 2, said output signal of said acceleration sensor 16 is compared to said reference value corresponding to a predefined motion of said headlamp 4, namely a zero movement of said headlamp 4 necessary for triggering said projection of said warning light patter 8 by means of said headlamp control unit 18. In the case of a standstill of said vehicle 2, thus at zero movement of said headlamp 4, said control data necessary for driving said light module 6 in order to project said warning light pat tern onto said projection surface 12 is pulled from said headlamp memory 20 and em ployed for projecting said warning light pattern as predefined and recorded in said headlamp memory 20.
For example, said warning light pattern could be a certain predefined light pattern 8 in order to inform about an emergency due to said attack of said control unit 14 of said vehicle 2. Said certain predefined light pattern 8 could be configured as a steady light pattern or a flashing light pattern. The invention is not limited to the exemplary embodiment of the invention.
The invention can be used advantageously for other types of vehicles, too. In general, the implementation of the invention requires no mechanical modifications pertaining to size, fit or weight in comparison to existing headlamps already known in the art. The at least one predefined light pattern can be of any useful and suitable type and number. The same is true for the at least one reference value for the comparison with the out put signal of the at least one acceleration sensor. For example, said at least one pre defined light pattern for an information of a traffic participant could correspond to a weather condition, a condition of the street or road the vehicle is driving on, a speed limit, a suggested direction to move and other useful and suitable information for at least one traffic participant. Instead of a three-axis acceleration sensor, other types and numbers of at least one acceleration sensor are possible. For example, a sepa rate acceleration sensor could be used for each spatial direction.
Unlike the aforementioned embodiment of the invention, said headlamp memory could be designed and configured as a flash memory, especially as a flash memory com prising a safeguard for granting access to write to said headlamp memory according to predefined access conditions. A flash memory is flexible, therefore allowing modifica tions of said at least one predefined light pattern recorded in the headlamp memory. A safeguard prevents from attacks or unwanted modifications of said at least one prede fined light pattern recorded in the headlamp memory. The same is true for another embodiment of the inventive method, wherein access to write to the headlamp memory designed and configured as a flash memory is granted according to prede fined access conditions. For example, said access to write could be granted solely to the manufacturer of the vehicle or to service providers certified by said manufacturer.
In another embodiment of the invention, a user of the vehicle is activating a switch of the vehicle in order to generate a trigger signal from the control unit of the vehicle to project a predefined light pattern on the projection surface. List of reference numbers
2 Vehicle
4 Headlamp
6 Light module
8 Light pattern
10 Traffic participant
12 Projection surface
14 Control unit of vehicle 2
16 Acceleration sensor of headlamp 4
18 Headlamp control unit of headlamp 4
20 Headlamp memory of headlamp 4

Claims

Headlamp for a vehicle, vehicle with a headlamp and method of driving a headlamp Claims
1. Headlamp (4) for a vehicle (2), comprising a light module (6) designed and configured to project at least one predefined light pattern (8) for an infor mation of a traffic participant (10) onto a projection surface (12) positioned outside said vehicle (2) in an assembly state of said headlamp (4) in which said headlamp (4) is assembled ready-to-use to said vehicle (2), whereat said at least one predefined light pattern (8) is projectable by means of said light module (6) according to a trigger signal from a control unit (14) of said vehicle (2) and an output signal of at least one acceleration sensor (16), wherein,
said at least one acceleration sensor (16) is incorporated into said headlamp (4), whereat said headlamp (4) comprises a headlamp control unit (18) which is designed and configured to compare said output signal of said at least one acceleration sensor (16) with at least one reference value corresponding to a predefined motion of said headlamp (4), and whereat said headlamp control unit (18) is designed and configured to trigger said at least one predefined light pattern (8) to be projected by means of said light module (6) according to said comparison.
2. Headlamp (4) according to claim 1 ,
wherein,
said acceleration sensor (16) is designed as a three-axis acceleration sensor (16).
3. Headlamp (4) according to one of the claims 1 or 2,
wherein, said headlamp (4) comprises a headlamp memory (20) for control data for driving said light module (6) to project said at least one predefined light pat tern (8).
4. Headlamp (4) according to claim 3,
wherein,
said headlamp memory (4) is designed and configured as a read-only memory (4).
5. Headlamp according to claim 3,
wherein,
said headlamp memory is designed and configured as a flash memory.
6. Headlamp according to claim 5,
wherein,
said headlamp memory comprises a safeguard for granting access to write to said headlamp memory according to predefined access conditions.
7. Vehicle (2) with a headlamp (4),
wherein,
said headlamp (4) is designed and configured according to one of the claims 1 to 6.
8. Method of driving a headlamp (4) for a vehicle (2) according to one of the claims 1 to 6, projecting at least one predefined light pattern (8) for an infor mation of a traffic participant (10) onto a projection surface (12) positioned outside said vehicle (2) in an assembly state of said headlamp (4), in which said headlamp (4) is assembled ready-to-use to said vehicle (2), by means of a light module (6) of said headlamp (4), whereat said at least one prede fined light pattern (8) is projected by means of said light module (6) accord ing to a trigger signal from a control unit (14) of said vehicle (2) and an out put signal of at least one acceleration sensor (16), wherein,
said output signal of said at least one acceleration sensor (16) is compared with at least one reference value corresponding to a predefined motion of said headlamp (4) by means of a headlamp control unit (18) of said head lamp (4), whereat said projection of said at least one predefined light pattern (8) by means of said light module (6) is triggered by a trigger signal of said headlamp control unit (18) according to said comparison.
9. Method according to claim 8,
wherein,
control data for driving said light module (6) to project said at least one pre defined light pattern (8) are recorded into a headlamp memory (20) of said headlamp (4) and pulled by said trigger signal from said headlamp control unit (18) of said headlamp (4).
10. Method according to claim 9,
wherein,
access to write to said headlamp memory designed and configured as a flash memory is granted according to predefined access conditions.
11. Method according to one of the claims 8 to 10,
wherein,
a warning light pattern (8) of said at least one predefined light pattern (8) comprising at least two predefined light patterns (8) is projected by means of said light module (6) according to an attack to said control unit (14) of said vehicle (2).
PCT/EP2018/083021 2018-11-29 2018-11-29 Headlamp for a vehicle, vehicle with a headlamp and method of driving a headlamp WO2020108761A1 (en)

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Citations (6)

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