EP3378281B1 - Dispositif d'éclairage pour un véhicule automobile - Google Patents

Dispositif d'éclairage pour un véhicule automobile Download PDF

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Publication number
EP3378281B1
EP3378281B1 EP16790614.8A EP16790614A EP3378281B1 EP 3378281 B1 EP3378281 B1 EP 3378281B1 EP 16790614 A EP16790614 A EP 16790614A EP 3378281 B1 EP3378281 B1 EP 3378281B1
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EP
European Patent Office
Prior art keywords
led units
led
data bus
illumination device
processing module
Prior art date
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Application number
EP16790614.8A
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German (de)
English (en)
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EP3378281A1 (fr
Inventor
Juergen Bruegl
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/18—Controlling the light source by remote control via data-bus transmission
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]

Definitions

  • the invention relates to a lighting device for a motor vehicle.
  • LEDs for lighting devices in motor vehicles in various versions.
  • the individual LEDs (monochrome, RGB, RGBW) are usually controlled by LED drivers.
  • a module is used with a microprocessor, on the one hand takes over communication with a motor vehicle data bus and on the other drives the LEDs, usually via PWM outputs.
  • a motor vehicle data bus is often the so-called.
  • LIN bus Local Interconnect Network
  • LED units which have an integrated circuit.
  • the LEDs and the integrated circuit are housed in a common housing, whereby a high packing density can be achieved.
  • the individual LED units are controlled by a data stream.
  • the publication US 2005/063194 A1 discloses an LED-based lighting device for a motor vehicle in which a plurality of LED units, each comprising a processor and a plurality of LEDs, are driven via a data bus.
  • the object of the invention is to provide a lighting device for a motor vehicle, which allows the coupling of a large number of LED units to a motor vehicle data bus.
  • the lighting device is intended for a motor vehicle, in particular for a car and possibly also for a truck, and comprises one or more Processing modules as well as an internal data bus and a plurality of LED units.
  • the internal data bus is an SPI (Serial Protocol Interface) data bus, which is known per se from the prior art.
  • the internal data bus may also be a differential data bus, thereby forming a differential data bus indicates that digital data is encoded by a voltage difference between two lines.
  • APIX is a bi-directional bus with additional sidebands. To control the LEDs you need only a part of it, so a uni-directional bus.
  • the lighting device for a motor vehicle according to the invention is defined in claim 1.
  • a plurality of LED units of the plurality of LED units are assigned to a respective processing module and the respective processing module is coupled to the associated LED units via the internal data bus.
  • the internal data bus is thus provided for communication between the respective processing modules and the associated LED units.
  • the LED units associated with a respective processing module each include one or more LEDs and an integrated circuit.
  • the LED units are connected to a power supply for the LED or LEDs.
  • the respective processing module is adapted to be coupled to a motor vehicle data bus for receiving first digital control commands for operating the lighting device from the motor vehicle data bus and for providing as second digital control commands to the internal data bus. Further, the LED units associated with a respective processing module are configured to supply power to their LEDs from the power supply based on the second digital control commands on the internal data bus via the integrated circuits.
  • a suitable conversion of control commands on a motor vehicle data bus into control commands on an internal data bus in the form of an SPI bus or a differential data bus is achieved.
  • the driving of a large number of LED units can be performed without being limited to a maximum number.
  • the number of LED units is usually limited to 16-24 due to line capacitances.
  • the processing module or modules are for coupling to a motor vehicle data bus set up in the form of the LIN bus already mentioned above.
  • a motor vehicle data bus and a CAN bus can be used.
  • the internal data bus is an SPI bus and the processing module (s) are configured such that the first digital control signals are applied to the SPI bus by means of software SPI and / or hardware SPI.
  • the software SPI method is well known in the art and, by means of a program library, allows to create an executable program on the appropriate processing module that configures each pin of the processing module as an SPI pin for connection to SPI bus lines can.
  • conventional I / O pins are configured as SPI pins.
  • dedicated pins of the processing module are provided for connection to the SPI bus.
  • a respective processing module of at least a portion of the processing modules is coupled to the internal data bus such that one or more, only the one or more, LED units assigned to several different (ie disjunctive) subsets of LED units respective subset associated data lines of the internal data bus are connected to the respective processing module to transmit the second digital control commands over this.
  • the data transmission takes place on the internal data bus via a plurality of different data lines for corresponding subsets of LED units.
  • this embodiment of the invention is combined with the software SPI method described above, in which any pins of the processing module are used to transfer data to the SPI bus.
  • the lighting device comprises only a single processing module for all LED units of the plurality of LED units.
  • one or more of the LED units of the plurality of LED units can have RGB LED units with a red, green and blue LED and / or RGBW LED units with a red, green, blue and be white LED.
  • one or more of the LED units of the plurality of LED units may also be configured as white light LED units with a white LED.
  • one or more of the LED units of the plurality of LED units may also be single color LED units with a single color LED (eg, red, green, or blue).
  • one or more of the LED units of the plurality of LED units are each configured such that the integrated circuit and the one or more LEDs of the respective LED unit are integrated in a common housing.
  • particularly compact LED units are used in the lighting device according to the invention, whereby their size can be reduced.
  • LED units of the type APA10x and / or of the types WS281x, SK691x, PL982x and derivatives of these types are used. These types of LED units are known per se from the prior art and allow their stringing together with a very high packing density.
  • one or more of the LED units of the plurality of LED units are each configured to supply power to the LED or LEDs of the respective LED unit from the power supply via PWM modulation.
  • one or more of the LED units of the plurality of LED units are each configured to supply power to the LED or LEDs of the respective LED unit via the setting of variable current levels.
  • the lighting device according to the invention may be provided for different purposes in the vehicle.
  • the lighting device may be an interior lighting in the interior of the vehicle. Nevertheless, there is also the possibility that the lighting device is an outdoor lighting on the outside of the motor vehicle.
  • the invention relates to a motor vehicle, in particular a car or optionally also a truck, which comprises one or more of the lighting devices according to the invention or preferred variants of these lighting devices.
  • a lighting device which comprises a plurality of LED units arranged on a belt as lighting means.
  • These LED units are in Fig. 1 denoted by the reference numeral 3.
  • the individual LEDs of the LED units are designated by reference numerals 301, 302 and 303.
  • the LED 301 is a red LED
  • the LED 302 is a green LED
  • the LED 303 is a blue LED.
  • Each LED unit 3 includes an integrated circuit, which is designated by reference numeral 4.
  • the LED units 3 are preferably LED units of the type APA10x or of the type WS281x, SK691x, PL982x, which have a very compact design.
  • the LEDs and the integrated circuit are housed in a common housing. With the ribbon-shaped LED units, a very high packing density can be achieved (depending on the housing form from 144 to 367 LEDs / m).
  • the individual LED units 3 are controlled via a digital data stream in the form of a bit stream which is supplied to the individual LED units by means of an internal data bus 2 (ie a data bus provided internally in the lighting device).
  • the internal data bus in the embodiment described here is an SPI bus with a line CL for the clock and a line DL for the bit stream.
  • two power lines L1 and L2 are provided which are connected to a DC power supply 5 are connected. Based on the bit stream received via the data line DL, a PWM modulation of the current supplied to the individual LEDs 301 to 303 takes place, in order thereby to drive the LEDs in accordance with the bit stream on the data line DL.
  • the structure of the LED units 3 off Fig. 1 is known and again in detail in Fig. 2 shown.
  • the functionalities of the data processing described below and the control of the LEDs 301 to 303 are realized via the integrated circuit 4 of the LED unit 3.
  • Fig. 2 One recognizes an input CKI and an output CKO for the clock signal of the clock line CL. Further, a data input terminal SDI and a data output terminal SDO for the bit stream are provided on the data line DL.
  • the received bit stream of the data line DL and the clock signal of the clock line CL reach the serial data input DI. Subsequently, the bit stream is decoded in the decoder DEC.
  • a so-called LED frame is generated in precisely timed sequence for each of the LEDs 301 to 303.
  • the frames of all LEDs of an LED unit 3 are transmitted as a packet on the data bus 2 and decoded in the decoder DEC. After decoding, it is checked whether the current packet for the corresponding LED unit is determined, which can be recognized by a code in the frame. If so, the decoded bitstream is applied to respective shift registers SR1 to SR3, with the shift register SR1 associated with the red LED 301, the shift register SR2 with the green LED 302, and the shift register SR3 associated with the blue LED 303. On the individual shift registers thus the corresponding signal for driving the respective LED is given.
  • the signal is a sequence of high / low signals which is converted in the LED unit 3 into a PWM signal for supplying power to the individual LEDs 301 to 303.
  • the three PWM generators G1, G2 and G3 are provided, analogous to the shift registers, the generator G1 for the red LED 301, the generator G2 for the green LED 302 and the generator G3 for the blue LED 303 is provided.
  • the individual PWM generators are connected to an oscillator OS, which receives an oscillator signal at the oscillator input OSCI.
  • the entrance and the exit are coupled to the line L1.
  • a voltage of 5 V is supplied thereto.
  • the grounding of the LEDs via the terminal VSS which is coupled to the line L2.
  • the SPI data bus known per se is used to provide the bit stream for the individual LEDs Fig. 1 designated by reference numeral 2. It is now essential to the invention that the bitstream is generated on the line DL by means of a processing module 1, which is coupled to a motor vehicle data bus 6, which in the embodiment described here is a LIN bus.
  • the processing module 1 comprises a LIN transceiver 101, which picks up corresponding digital signals for driving the LED units 3 from the LIN bus 6, and a microprocessor 102, which converts the tapped signals into corresponding data signals on the data line DL.
  • the signals transmitted on the LIN bus 6 in this case comprise signals which are intended for the lighting device and define a light pattern to be set for the lighting device.
  • These signals in turn come from a control unit of the motor vehicle, which determines the light pattern to be generated based on an input of the driver, for example, and outputs it as a corresponding signal to the LIN bus.
  • a control unit of the motor vehicle determines the light pattern to be generated based on an input of the driver, for example, and outputs it as a corresponding signal to the LIN bus.
  • About the processing module 1 is detected whether the light pattern is provided according to the current signal on the LIN bus 6 for the lighting device. If this is the case, this signal is converted by means of the microprocessor 102 into a corresponding signal for the SPI data bus 2.
  • the microprocessor 102 generates the signals for the SPI bus 2 by means of software SPI.
  • Software SPI is known per se from the prior art and represents a program library with which any free pins of the microprocessor can be used for signal output to the SPI bus 2. Alternatively, however, hardware SPI can also be used. Special SPI pins are provided for signal output to the SPI bus 2.
  • the use of software SPI has the advantage that in the internal data bus 2 a plurality of lines DL and CL can be provided for driving a larger number of LED units 3.
  • the variant of the invention described above has a number of advantages.
  • a signal on a LIN bus in an SPI signal can be achieved driving a very large number of LED units.
  • any pins in a corresponding processing module can be used to generate signals for the SPI bus.
  • only a single processing module can be used to control all LED units provided in a specific area of the motor vehicle (eg door or seat).
  • the existing LIN architecture can be retained in a motor vehicle.
  • known per se LED units can be used. It is only necessary to implement a suitable conversion of the LIN signals on the LIN bus into signals of an SPI bus.

Landscapes

  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)

Claims (14)

  1. Dispositif d'éclairage d'un véhicule comprenant au moins un module de traitement (1) ainsi qu'un bus de données interne (2) et un ensemble d'unités de LED (3),
    caractérisé en ce que
    le bus de données interne (2) est un bus-SPI ou un bus différentiel qui code des données numériques par l'intermédiaire d'une différence de tension entre deux conduites, à un module de traitement respectif (1) étant associées plusieurs unités de LED parmi l'ensemble d'unités de LED (3) et le module de traitement (1) étant couplé aux unités de LED (3) associées par l'intermédiaire du bus de données interne (2),
    les unités de LED (3) associées comportant chacune au moins une LED (301, 302, 303) et un circuit intégré (4), et étant connectées à une alimentation en courant (5) de la LED (301, 302, 303), le module de traitement (1) respectif étant susceptible d'être couplé à un bus de données (6) du véhicule pour recevoir, à partir du bus de données (6) du véhicule, et convertir des premiers ordres de commande numériques pour faire fonctionner le dispositif d'éclairage, et les délivrer au bus de données internes (2) en tant que seconds ordres de commande numérique,
    les unités de LED (3) associées étant susceptibles de transmettre à leurs LED (3) un courant provenant de l'alimentation en tension (5) sur le fondement des seconds ordres de commande numériques sur le bus de données interne (2) au moyen des circuits intégrés (4).
  2. Dispositif d'éclairage conforme à la revendication 1,
    caractérisé en ce que
    le module de traitement (1) est susceptible d'être couplé à un bus de données (6) du véhicule sous la forme d'un bus LIN.
  3. Dispositif d'éclairage conforme à la revendication 1 ou 2,
    caractérisé en ce que
    le bus de données interne (2) est un bus SPI et le module de traitement (1) est équipé de sorte que les premiers signaux de commande numériques soient délivrés au bus SPI au moyen d'un logiciel SPI et/ou d'un matériel SPI.
  4. Dispositif d'éclairage conforme à la revendication 1 ou 2,
    caractérisé en ce que
    le bus de données interne (2) est un bus de données différentiel sous la forme d'un bus APIX.
  5. Dispositif d'éclairage conforme à l'une des revendications précédentes,
    caractérisé en ce qu'
    un module de traitement (1) respectif d'au moins une partie du module de traitement (1) est couplé au bus de données interne (2) de sorte que, pour plusieurs sous ensemble différents d'unités de LED (3) associées au module de traitement (1) respectif, respectivement au moins l'une des conduites de données (DL) du bus de données interne (2), associée uniquement au sous ensemble respectif soit reliée au module de traitement (1) respectif pour pouvoir transmettre sur celle-ci les seconds ordres de commande numériques.
  6. Dispositif d'éclairage conforme à l'une des revendications précédentes,
    caractérisé en ce qu'
    il comporte un seul module de traitement (1) pour toutes les unités de LED de l'ensemble d'unités de LED (3).
  7. Dispositif d'éclairage conforme à l'une des revendications précédentes,
    caractérisé en ce qu'
    au moins une unité de LED parmi l'ensemble d'unités de LED (3) est une unité de LED-RGB ayant une LED rouge, une LED verte et une LED bleue et/ou une unité de LED-RGBW ayant une LED rouge, une LED verte, une LED bleue et une LED blanche.
  8. Dispositif d'éclairage conforme à l'une des revendications 1 à 6,
    caractérisé en ce qu'
    au moins une unité de LED parmi l'ensemble d'unités de LED est une unité de LED à lumière blanche ayant une LED blanche.
  9. Dispositif d'éclairage conforme à l'une des revendications 1 à 6,
    caractérisé en ce qu'
    au moins une unité de LED parmi l'ensemble d'unités de LED (3) est une unité de LED-monochrome ayant une LED-monochrome.
  10. Dispositif d'éclairage conforme à l'une des revendications précédentes,
    caractérisé en ce qu'
    au moins une unité de LED parmi l'ensemble d'unités de LED (3) est respectivement réalisée de sorte que le circuit intégré (4) et la LED (301, 302, 303) de l'unité de LED respective (3) soient intégrés dans un boîtier commun.
  11. Dispositif d'éclairage conforme à l'une des revendications précédentes,
    caractérisé en ce qu'
    au moins une unité de LED parmi l'ensemble d'unités de LED (3) est respectivement réalisée de façon à transmettre à la LED (301, 302, 303) de l'unité de LED (3) respective du courant provenant de l'alimentation en tension (5) par modulation PWM.
  12. Dispositif d'éclairage conforme à l'une des revendications précédentes,
    caractérisé en ce qu'
    au moins une unité de LED (3) parmi l'ensemble d'unités de LED (3) est respectivement réalisée de façon à transmettre à la LED (301, 302, 303) de l'unité de LED (3) respective du courant provenant de l'alimentation en tension (5) par réglage d'un niveau de courant variable.
  13. Dispositif d'éclairage conforme à l'une des revendications précédentes,
    caractérisé en ce qu'
    il est constitué par un dispositif d'éclairage de l'habitacle d'un véhicule ou un éclairage externe situé sur la face externe du véhicule.
  14. Véhicule comprenant au moins un dispositif d'éclairage conforme à l'une des revendications précédentes.
EP16790614.8A 2015-11-16 2016-11-03 Dispositif d'éclairage pour un véhicule automobile Active EP3378281B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015222504.6A DE102015222504A1 (de) 2015-11-16 2015-11-16 Beleuchtungsvorrichtung für ein Kraftfahrzeug
PCT/EP2016/076549 WO2017084881A1 (fr) 2015-11-16 2016-11-03 Dispositif d'éclairage pour un véhicule automobile

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Publication Number Publication Date
EP3378281A1 EP3378281A1 (fr) 2018-09-26
EP3378281B1 true EP3378281B1 (fr) 2019-06-26

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EP (1) EP3378281B1 (fr)
DE (1) DE102015222504A1 (fr)
WO (1) WO2017084881A1 (fr)

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
DE102015222504A1 (de) 2015-11-16 2017-05-18 Bayerische Motoren Werke Aktiengesellschaft Beleuchtungsvorrichtung für ein Kraftfahrzeug
EP3510721A1 (fr) * 2016-09-09 2019-07-17 ELMOS Semiconductor Aktiengesellschaft Dispositif pour assurer la commande de composants électriques et/ou électroniques d'un module pour véhicule à moteur
CN110679124B (zh) 2017-07-11 2020-09-08 伊诺瓦半导体有限责任公司 数据讯框的节能交换
EP3478031B1 (fr) 2017-10-30 2020-06-24 Melexis Technologies NV Protocole de bus pour application d'éclairage dynamique
EP3886371A1 (fr) * 2018-03-02 2021-09-29 Elmos Semiconductor SE Procédé et dispositif de commande des composants électriques et/ou électroniques d'un module de véhicule à moteur
FR3090524B1 (fr) 2018-12-20 2021-04-30 Valeo Vision Dispositif d'éclairage de l’intérieur de l’habitacle d’un véhicule automobile comprenant une source lumineuse pourvue d’un contrôleur intégré
DE102019124960A1 (de) * 2019-09-17 2021-03-18 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Betreiben einer Beleuchtungsvorrichtung für ein Kraftfahrzeug
EP4280823B1 (fr) 2022-05-16 2024-02-28 Melexis Technologies NV Protocole de bus avancé d'éclairage dynamique

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WO2017084881A1 (fr) 2017-05-26
DE102015222504A1 (de) 2017-05-18
EP3378281A1 (fr) 2018-09-26

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