WO2021074496A1 - Method for controlling lighting and signaling modules for motor vehicles - Google Patents

Method for controlling lighting and signaling modules for motor vehicles Download PDF

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Publication number
WO2021074496A1
WO2021074496A1 PCT/FR2020/051637 FR2020051637W WO2021074496A1 WO 2021074496 A1 WO2021074496 A1 WO 2021074496A1 FR 2020051637 W FR2020051637 W FR 2020051637W WO 2021074496 A1 WO2021074496 A1 WO 2021074496A1
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Prior art keywords
current
intensity
control method
variation
lighting
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PCT/FR2020/051637
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French (fr)
Inventor
Whilk Marcelino GONCALVES
Mathieu Collot
Valerie Molto
Christophe Le Dall
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Psa Automobiles Sa
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Publication date
Application filed by Psa Automobiles Sa filed Critical Psa Automobiles Sa
Priority to EP20785820.0A priority Critical patent/EP4046464A1/en
Priority to CN202080072562.0A priority patent/CN114557131A/en
Publication of WO2021074496A1 publication Critical patent/WO2021074496A1/en

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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
    • B60Q1/1407—General lighting circuits comprising dimming circuits
    • 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
    • H05B45/34—Voltage stabilisation; Maintaining constant voltage
    • 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]
    • H05B45/10—Controlling the intensity of the light

Definitions

  • TITLE Method for controlling lighting and signaling modules for motor vehicles
  • the invention relates to a method for controlling lighting and signaling modules with the aim of reducing energy consumption.
  • the lighting and signaling modules (projector, daytime running lights, etc.) generally include a lighting source (halogen, xenon, LED lamp) controlled by an electronic card (PCB) and associated with various components optical (lens, reflector, etc.), the assembly being intended to be encapsulated in a housing.
  • a lighting source halogen, xenon, LED lamp
  • PCB electronic card
  • optical lens, reflector, etc.
  • LED headlamps and lights are often supplied and controlled with electric energy of constant power (stabilized current and constant voltage), this power (P) being determined by the product of the intensity (1) of the current and of voltage (U).
  • Patent EP2741578B1 describes a control circuit and a method for driving LEDs consisting in delivering a signal intended to adjust the reference current source to thus vary the voltage of the output current within a determined range.
  • the aim of the invention is to obtain, in one cycle, at a time, the attainment of optimal performance (range of lighting, perception of brightness, width of the beam, etc.). ) and, taking into account regulatory tolerances, a significant reduction in energy consumption without noticeable perception of the variations by the user of the vehicle, and without causing any deterioration in safety conditions.
  • a method for controlling a motor vehicle lighting module comprising at least one light emitting diode (LED) supplied by a direct electric current, characterized in that that the intensity of the current is varied sinusoidally, at constant voltage, with an oscillation period of between 30s and 60s.
  • LED light emitting diode
  • the intensity of the current is varied between 0.7 A and 1.1 A.
  • the variation in amplitude of the oscillations is less than or equal to 20%.
  • Another object of the invention is a device for implementing the control method defined above from a direct current delivered by an on-board battery, characterized in that it comprises an electronic circuit converting direct current (DC) into alternating current (AC) intended to supply the vehicle's lighting and signaling modules.
  • DC direct current
  • AC alternating current
  • Yet another object of the invention is an energy-saving motor vehicle equipped with lighting and signaling modules controlled with the method according to one of the preceding claims.
  • the sinusoidal function of the intensity of the current is a function simple to obtain by the traditional methods of converting AC / DC signals which is derivable and continuous and which does not induce, for an observer , significant modification of the visual appearance of the light beam.
  • the invention is of significant technical and economic interest because, thanks to the piloting process, it is possible to obtain an energy saving of about 10%.
  • the intensity of the current varies within a range of values lower than the intensity of the stabilized currents (generally 0.8A) which allows a reduction in the number of LEDs, and, consequently, a reduction in the cost of lighting modules.
  • FIG. 1 is a graph representing a stable power supply profile (current Io and voltage Uo) as a function of time t (in seconds s).
  • FIG. 2 is a graph representing a sinusoidal power supply profile according to the method of the invention with a variable intensity (1) and a maximum current reduction amplitude of k (%) over the same period To of time t as in FIG. 1.
  • FIG. 3 is an overall diagram of a device capable of ensuring the implementation of the method of the invention for controlling the lighting modules.
  • FIG. 4 shows an embodiment of an electronic circuit capable of generating a sinusoidal control signal from a direct current signal.
  • the method of the invention is intended for controlling a lighting and / or signaling module of a motor vehicle with the aim of saving energy.
  • Such a module 3 shown schematically in Figure 3 (for example, a projector) comprises, in general, at least one light source such as a light emitting diode (LED) supplied by a direct electric current and stabilized delivered by an on-board battery 1.
  • a current the voltage U of which is generally 12V
  • FIG. 1 illustrates a profile which is illustrated by FIG. 1.
  • the control method of the invention consists in modifying the profile of the supply current of the lighting modules by varying the intensity of the current sinusoidally with a long period of oscillation (To) of between 30s and 60s. Under these conditions, the power oscillations are neither perceptible nor annoying for the driver of the vehicle or for the drivers of other vehicles.
  • FIG. 2 The specific profile according to the method of the invention for supplying electrical power to the module is illustrated in FIG. 2.
  • This power variation complies, from a regulatory point of view, with the permitted variation ranges and can be obtained by means of traditional oscillators such as.
  • the sinusoidal profile of the current variations can be generalized by approximation by means of mathematical functions integrating polynomials, splines, etc., ... by providing technical effects similar to those produced by the sinusoidal function (A).
  • a system allowing an implementation of the control method of the invention is schematically illustrated in Figure 3.
  • the main power source consists of the battery 1 of the vehicle which delivers a stabilized direct current (DC) which the voltage Uo is 12V.
  • alternating current signal AC
  • driver a converter 2 (or “driver") comprising an electronic circuit of the type shown in FIG. 4.
  • the alternating signal is then sent to the lighting and signaling modules 3 and, in particular, to the headlamps and to the light-emitting diode lights 4 (LEDs), as illustrated by Figures 3 and 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention relates to a method for controlling a motor vehicle lighting module comprising at least one light emitting diode powered by an electric current, characterized in that the intensity (I) of the current is varied sinusoidally at a constant voltage (Uo), with an oscillation period (To) of 30s to 60s.

Description

DESCRIPTION DESCRIPTION
TITRE : Procédé de pilotage des modules d'éclairage et de signalisation pour véhicules automobiles TITLE: Method for controlling lighting and signaling modules for motor vehicles
[0001] La présente invention revendique la priorité de la demande française 1911633 déposée le 17 Octobre 2019 dont le contenu (texte, dessins et revendications) est ici incorporé par référence. L’invention s’applique au pilotage des modules d’éclairage et de signalisation de véhicules automobiles. The present invention claims the priority of the French application 1911633 filed on October 17, 2019, the content of which (text, drawings and claims) is incorporated here by reference. The invention applies to the control of lighting and signaling modules of motor vehicles.
[0002] Plus particulièrement, l’invention concerne un procédé de pilotage des modules d’éclairage et de signalisation dans un objectif de réduction de la consommation énergétique. [0002] More particularly, the invention relates to a method for controlling lighting and signaling modules with the aim of reducing energy consumption.
[0003] Les modules d’éclairage et de signalisation (projecteur, feux de jour, ...) comprennent généralement une source d’éclairage (lampe Halogène, Xénon, LED) commandée par une carte électronique (PCB) et associée à divers composants optiques (lentille, réflecteur ...), l’ensemble étant destiné à être encapsulé dans un boîtier. [0003] The lighting and signaling modules (projector, daytime running lights, etc.) generally include a lighting source (halogen, xenon, LED lamp) controlled by an electronic card (PCB) and associated with various components optical (lens, reflector, etc.), the assembly being intended to be encapsulated in a housing.
[0004] Les projecteurs et feux à LEDs sont souvent alimentés et pilotés avec une énergie électrique de puissance constante (courant stabilisé et tension constante), cette puissance (P) étant déterminée par le produit de l’intensité (1) du courant et de la tension (U). [0004] LED headlamps and lights are often supplied and controlled with electric energy of constant power (stabilized current and constant voltage), this power (P) being determined by the product of the intensity (1) of the current and of voltage (U).
[0005] Par ailleurs, la consommation d’énergie (E) d’un système électrique est constante et se calcule par la formule (E) = Puissance (P) x durée (T). Or, aujourd’hui, l’industrie automobile est contrainte de réduire fortement la consommation d’énergie des véhicules afin de réduire les émissions de C02, sans pour autant consentir à limiter de façon sensible les performances et les propriétés des systèmes d’éclairage. [0005] Furthermore, the energy consumption (E) of an electrical system is constant and is calculated by the formula (E) = Power (P) x duration (T). However, today, the automotive industry is forced to significantly reduce the energy consumption of vehicles in order to reduce C02 emissions, without agreeing to significantly limit the performance and properties of lighting systems.
[0006] 11 est connu, notamment, par les demandes de brevet FR2983143 et[0006] 11 is known, in particular, from patent applications FR2983143 and
EP2261081, une méthode pour réduire la consommation énergétique consistant à baisser l’intensité du courant en la maintenant constante de telle sorte que la variation de lumière résultante continue de respecter les seuils réglementaires sans être perceptible par l’utilisateur du véhicule. [0007] Le brevet EP2741578B1 décrit un circuit de commande et un procédé de pilotage de LEDs consistant à délivrer un signal destiné à ajuster la source de courant de référence pour faire ainsi varier la tension du courant de sortie dans une plage déterminée. EP2261081, a method for reducing energy consumption consisting in lowering the intensity of the current while maintaining it constant so that the resulting variation in light continues to comply with regulatory thresholds without being perceptible by the user of the vehicle. [0007] Patent EP2741578B1 describes a control circuit and a method for driving LEDs consisting in delivering a signal intended to adjust the reference current source to thus vary the voltage of the output current within a determined range.
[0008] Par ailleurs, dans les anciennes générations de véhicules, les alternateurs n’étaient pas suffisamment stabilisés ce qui provoquait des variations d’intensité. Cependant, ces variations n’étaient ni volontaires, ni maîtrisées, et étaient sans lien avec un éventuel objectif de réduction de la consommation électrique qui n’était pas d’actualité. [0008] Furthermore, in older generations of vehicles, the alternators were not sufficiently stabilized, which caused variations in intensity. However, these variations were neither intentional nor controlled, and were unrelated to a possible goal of reducing power consumption which was not relevant.
[0009] Ainsi, dans le contexte actuel, l’invention a pour objectif d’obtenir dans un cycle, à la fois, l’atteinte des performances optimales (portée de l’éclairage, perception de brillance, largeur du faisceau, etc.) et, compte tenu des tolérances réglementaires, une réduction significative de la consommation énergétique sans perception notable des variations par l’utilisateur du véhicule, et sans induire de dégradation des conditions de sécurité. [0009] Thus, in the current context, the aim of the invention is to obtain, in one cycle, at a time, the attainment of optimal performance (range of lighting, perception of brightness, width of the beam, etc.). ) and, taking into account regulatory tolerances, a significant reduction in energy consumption without noticeable perception of the variations by the user of the vehicle, and without causing any deterioration in safety conditions.
[0010] Ce but est atteint, selon l’invention, au moyen d’un procédé de pilotage d’un module d’éclairage de véhicule automobile comprenant au moins une diode luminescente (LED) alimentée par un courant électrique continu, caractérisé en ce qu’on fait varier l’intensité du courant de façon sinusoïdale, à tension constante, avec une période d’oscillation comprise entre 30s et 60s. This object is achieved, according to the invention, by means of a method for controlling a motor vehicle lighting module comprising at least one light emitting diode (LED) supplied by a direct electric current, characterized in that that the intensity of the current is varied sinusoidally, at constant voltage, with an oscillation period of between 30s and 60s.
[0011] Selon un mode de mise en œuvre préférentiel du procédé de l’invention, on fait varier l’intensité du courant électrique selon la loi fonction du temps, l(t) = Io-klo sin2 (2 p t/To), où k est la variation d’amplitude des oscillations du courant etTo est la période d’oscillation. According to a preferred embodiment of the method of the invention, the intensity of the electric current is varied according to the law as a function of time, l (t) = Io-klo sin 2 (2 pt / To) , where k is the variation in amplitude of the current oscillations andTo is the period of oscillation.
[0012] Selon une caractéristique avantageuse du procédé, on fait varier l’intensité du courant entre 0,7 A et 1,1 A. According to an advantageous characteristic of the process, the intensity of the current is varied between 0.7 A and 1.1 A.
[0013] Selon une autre caractéristique, la variation d’amplitude des oscillations est inférieure ou égale à 20%. [0014] Selon une variante de mise en œuvre du procédé, il est prévu qu’à tension constante, on fasse varier la puissance du courant selon la loi en fonction du temps : P(t) = IoUo - kloUo sin2 (2 p t/To), où k est la variation d’amplitude des oscillations du courant etTo est la période d’oscillation. According to another characteristic, the variation in amplitude of the oscillations is less than or equal to 20%. According to a variant implementation of the method, it is expected that at constant voltage, the power of the current is varied according to the law as a function of time: P (t) = IoUo - kloUo sin 2 (2 pt / To), where k is the variation in amplitude of the current oscillations andTo is the period of oscillation.
[0015] Selon une autre caractéristique de l’invention, la réduction de la consommation d’énergie électrique E est donnée par la formule DE/E = k/2 où k est la variation d’amplitude des oscillations du courant. [0015] According to another characteristic of the invention, the reduction in the consumption of electrical energy E is given by the formula DE / E = k / 2 where k is the variation in the amplitude of the oscillations of the current.
[0016] Un autre objet de l’invention est un dispositif pour la mise en œuvre du procédé de pilotage défini ci-dessus à partir d’un courant continu délivré par une batterie embarquée, caractérisé en ce qu’il comprend un circuit électronique convertissant le courant continu (DC) en un courant alternatif (AC) destiné à alimenter les modules d’éclairage et de signalisation du véhicule. Another object of the invention is a device for implementing the control method defined above from a direct current delivered by an on-board battery, characterized in that it comprises an electronic circuit converting direct current (DC) into alternating current (AC) intended to supply the vehicle's lighting and signaling modules.
[0017] Encore un autre objet de l’invention est un véhicule automobile à économie d’énergie équipé de modules d’éclairage et de signalisation pilotés avec le procédé selon l’une des revendications précédentes. [0017] Yet another object of the invention is an energy-saving motor vehicle equipped with lighting and signaling modules controlled with the method according to one of the preceding claims.
[0018] La fonction sinusoïdale de l’intensité du courant (ou de sa puissance) est une fonction simple à obtenir par les méthodes traditionnelles de conversion des signaux AC/DC qui est dérivable et continue et qui n’induit pas, pour un observateur, de modification significative de l’aspect visuel du faisceau lumineux. The sinusoidal function of the intensity of the current (or of its power) is a function simple to obtain by the traditional methods of converting AC / DC signals which is derivable and continuous and which does not induce, for an observer , significant modification of the visual appearance of the light beam.
[0019] L’invention présente un intérêt technico-économique significatif car grâce au procédé de pilotage, il est possible d’obtenir une économie d’énergie d’environ 10%. The invention is of significant technical and economic interest because, thanks to the piloting process, it is possible to obtain an energy saving of about 10%.
[0020] En outre, du fait de l’utilisation d’une fonction sinusoïdale, l’intensité du courant varie dans une plage de valeurs inférieures à l’intensité des courants stabilisés (généralement 0,8A) ce qui permet une réduction du nombre de LEDs, et, en conséquence, une diminution du coût des modules d'éclairage. In addition, due to the use of a sinusoidal function, the intensity of the current varies within a range of values lower than the intensity of the stabilized currents (generally 0.8A) which allows a reduction in the number of LEDs, and, consequently, a reduction in the cost of lighting modules.
[0021] D’autres caractéristiques et avantages de l’invention ressortiront à la lecture de la description qui va suivre, en référence aux figures annexées et détaillées ci-après. [0022] [Fig. 1] est un graphe représentant un profil d’alimentation électrique stable (courant Io et tension Uo) en fonction du temps t (en secondes s). Other characteristics and advantages of the invention will emerge on reading the description which follows, with reference to the appended and detailed figures below. [0022] [Fig. 1] is a graph representing a stable power supply profile (current Io and voltage Uo) as a function of time t (in seconds s).
[0023] [Fig. 2] est un graphe représentant un profil d’alimentation sinusoïdal selon le procédé de l’invention avec une intensité (1) variable et une amplitude maximale de réduction de courant de k (%) sur la même période To de temps t que la figure 1. [0023] [Fig. 2] is a graph representing a sinusoidal power supply profile according to the method of the invention with a variable intensity (1) and a maximum current reduction amplitude of k (%) over the same period To of time t as in FIG. 1.
[0024] [Fig. 3] est un schéma global d’un dispositif apte à assurer la mise en œuvre du procédé de l’invention pour le pilotage des modules d’éclairage. [0024] [Fig. 3] is an overall diagram of a device capable of ensuring the implementation of the method of the invention for controlling the lighting modules.
[0025] [Fig. 4] représente un mode de réalisation d’un circuit électronique apte à générer un signal de pilotage sinusoïdal à partir d’un signal de courant continu. [0025] [Fig. 4] shows an embodiment of an electronic circuit capable of generating a sinusoidal control signal from a direct current signal.
[0026] Pour plus de clarté, les éléments identiques ou similaires sont repérés par des signes de référence identiques sur l’ensemble des figures. For greater clarity, identical or similar elements are identified by identical reference signs in all of the figures.
[0027] Naturellement, le mode de mise en œuvre du procédé de l’invention illustré par la figure présentée ci-dessus et décrite ci-après, n’est donné qu'à titre d’exemple non limitatif. 11 est explicitement prévu selon l’invention que l'on puisse proposer et combiner entre eux différents modes. Naturally, the mode of implementation of the method of the invention illustrated by the figure presented above and described below, is given only by way of non-limiting example. It is explicitly provided according to the invention that one can propose and combine different modes.
[0028] Le procédé de l’invention est destiné au pilotage d’un module d’éclairage et/ou de signalisation d’un véhicule automobile dans un objectif d’économie d’énergie. [0028] The method of the invention is intended for controlling a lighting and / or signaling module of a motor vehicle with the aim of saving energy.
[0029] Un tel module 3 représenté schématiquement sur la figure 3 (par exemple, un projecteur) comprend, en général, au moins une source de lumière telle qu’une diode électroluminescente (LED) alimentée par un courant électrique continu et stabilisé délivré par une batterie 1 embarquée. Un tel courant (dont la tension U est généralement de 12V) présente un profil qui est illustré par la figure 1. Such a module 3 shown schematically in Figure 3 (for example, a projector) comprises, in general, at least one light source such as a light emitting diode (LED) supplied by a direct electric current and stabilized delivered by an on-board battery 1. Such a current (the voltage U of which is generally 12V) has a profile which is illustrated by FIG. 1.
[0030] Par conséquent, la tension d'alimentation U de ce courant électrique est constante (référencée Uo) et la puissance P est déterminée par le produit de l’intensité de ce courant et de sa tension (P = Uo x 1). La consommation d'énergie E du module d’éclairage est également constante et est calculée par le produit de sa puissance avec le temps (E = P xt). [0031] Le procédé de pilotage de l’invention consiste à modifier le profil du courant d’alimentation des modules d’éclairage en faisant varier l’intensité du courant de façon sinusoïdale avec une longue période d’oscillation (To) comprise entre 30s et 60s. Dans ces conditions, les oscillations de puissance ne sont ni perceptibles, ni gênantes pour le conducteur du véhicule ou pour les conducteurs des autres véhicules. Consequently, the supply voltage U of this electric current is constant (referenced Uo) and the power P is determined by the product of the intensity of this current and its voltage (P = Uo x 1). The energy consumption E of the lighting module is also constant and is calculated by the product of its power over time (E = P xt). The control method of the invention consists in modifying the profile of the supply current of the lighting modules by varying the intensity of the current sinusoidally with a long period of oscillation (To) of between 30s and 60s. Under these conditions, the power oscillations are neither perceptible nor annoying for the driver of the vehicle or for the drivers of other vehicles.
[0032] Le profil spécifique selon le procédé de l’invention d’alimentation électrique du module est illustré par la figure 2. Ce profil correspond à des oscillations de l’intensité 1 du courant (en ampères), avec un pic de réduction de courant de k = 0.2 (- 20%). Ces oscillations découlent de la fonction sinusoïdale (A) du courant : l(t) = Io-klo sin2 (2 p t/To), où k est la variation d’amplitude des oscillations du courant etTo est la période d’oscillation. The specific profile according to the method of the invention for supplying electrical power to the module is illustrated in FIG. 2. This profile corresponds to oscillations of the intensity 1 of the current (in amperes), with a reduction peak of current of k = 0.2 (- 20%). These oscillations result from the sinusoidal function (A) of the current: l (t) = Io-klo sin 2 (2 pt / To), where k is the variation in amplitude of the oscillations of the current andTo is the period of oscillation.
[0033] Cette variation d’intensité du courant a pour corollaire une variation de la puissance P (en watts) régie par l’équation (B) : P(t) = loUo - kloUo sin2 (2 p t/To), où k est la variation d’amplitude des oscillations du courant etTo est la période d’oscillation. This variation in intensity of the current has as a corollary a variation of the power P (in watts) governed by equation (B): P (t) = loUo - kloUo sin 2 (2 pt / To), where k is the variation in the amplitude of the current oscillations and To is the period of oscillation.
[0034] Cette variation de puissance est conforme, d’un point de vue réglementaire, aux plages de variations admises et peut être obtenue au moyen d’oscillateurs traditionnels tels que. This power variation complies, from a regulatory point of view, with the permitted variation ranges and can be obtained by means of traditional oscillators such as.
[0035] Le Profil d’alimentation correspondant à la fonction sinusoïdale de la figure 2 apporte un gain d'énergie DE donné par l'équation (C) (figure 2) qui se traduit par un ratio (D) : DE/E = k/2. The power supply profile corresponding to the sinusoidal function of Figure 2 provides an energy gain DE given by equation (C) (Figure 2) which results in a ratio (D): DE / E = k / 2.
[0036] La variation de l’intensité du courant avec une amplitude de k = 20% permet ainsi d’économiser 10% d'énergie dans le cycle choisi, ce chiffre étant indépendant de la période d'oscillation, comme le montre la formule (C). The variation of the intensity of the current with an amplitude of k = 20% thus makes it possible to save 10% of energy in the chosen cycle, this figure being independent of the period of oscillation, as shown by the formula (VS).
[0037] Le profil sinusoïdal des variations du courant peut être généralisé par approximation au moyen de fonctions mathématiques intégrant des polynômes, des splines, etc, ...en apportant des effets techniques analogues à ceux produits par la fonction sinusoïdale (A). [0038] Un système permettant une mise en œuvre du procédé de pilotage de l’invention est illustré schématiquement par la figure 3. La source d’alimentation principale est constituée de la batterie 1 du véhicule qui délivre un courant continu stabilisé (DC) dont la tension Uo est de 12V. The sinusoidal profile of the current variations can be generalized by approximation by means of mathematical functions integrating polynomials, splines, etc., ... by providing technical effects similar to those produced by the sinusoidal function (A). A system allowing an implementation of the control method of the invention is schematically illustrated in Figure 3. The main power source consists of the battery 1 of the vehicle which delivers a stabilized direct current (DC) which the voltage Uo is 12V.
[0039] L’intensité de ce courant est convertie en un signal de courant alternatif (AC) par un convertisseur 2 (ou « driver ») comprenant un circuit électronique du type de celui qui est représenté sur la figure 4. Le signal alterné est envoyé ensuite aux modules 3 d’éclairage et de signalisation et, en particulier, aux projecteurs et aux feux à diodes électroluminescentes 4 (LEDs), comme illustré par les figures 3 et 4. The intensity of this current is converted into an alternating current signal (AC) by a converter 2 (or "driver") comprising an electronic circuit of the type shown in FIG. 4. The alternating signal is then sent to the lighting and signaling modules 3 and, in particular, to the headlamps and to the light-emitting diode lights 4 (LEDs), as illustrated by Figures 3 and 4.

Claims

REVENDICATIONS
1 . Procédé de pilotage d’un module d’éclairage de véhicule automobile comprenant au moins une diode électroluminescente alimentée par un courant électrique, caractérisé en ce qu’on fait varier l’intensité (1) du courant de façon sinusoïdale, à tension constante (Uo), avec une période d’oscillation (To) comprise entre 30s et 60s. 1. Method for controlling a motor vehicle lighting module comprising at least one light-emitting diode supplied with an electric current, characterized in that the intensity (1) of the current is varied sinusoidally, at constant voltage (Uo ), with an oscillation period (To) between 30s and 60s.
2. Procédé de pilotage selon la revendication 1, caractérisé en ce qu’on fait varier l’intensité (1) du courant électrique selon la loi (A) en fonction du temps ; 1 = Io- klo sin2 (2 p t/To), où k est la variation d’amplitude des oscillations du courant et To est la période d’oscillation. 2. A control method according to claim 1, characterized in that the intensity (1) of the electric current is varied according to the law (A) as a function of time; 1 = Ioklo sin 2 (2 pt / To), where k is the variation in amplitude of the current oscillations and To is the period of oscillation.
3. Procédé de pilotage selon la revendication précédente, caractérisé en ce qu’on fait varier l’intensité du courant électrique entre 0,7 A et 1,1 A. 3. A control method according to the preceding claim, characterized in that the intensity of the electric current is varied between 0.7 A and 1.1 A.
4. Procédé de pilotage selon l’une des revendications précédentes, caractérisé en ce que, à tension constante (Uo), on fait varier la puissance (P) du courant selon la loi en fonction du temps ; P = loUo - kloUo sin2 (2 p t/To), où k est la variation d’amplitude des oscillations du courant etTo est la période d’oscillation. 4. Control method according to one of the preceding claims, characterized in that, at constant voltage (Uo), the power (P) of the current is varied according to the law as a function of time; P = loUo - kloUo sin 2 (2 pt / To), where k is the variation in amplitude of the current oscillations and To is the period of oscillation.
5. Procédé de pilotage selon l’une des revendications précédentes, caractérisé en ce que la variation d’amplitude (k) des oscillations est inférieure ou égale à 20%. 5. A control method according to one of the preceding claims, characterized in that the amplitude variation (k) of the oscillations is less than or equal to 20%.
6. Procédé de pilotage selon l’une des revendications précédentes, caractérisé en ce que la réduction de la consommation d’énergie électrique (E) est donnée par la formule DE/E = k/2 où k est la variation d’amplitude des oscillations du courant. 6. A control method according to one of the preceding claims, characterized in that the reduction in the consumption of electrical energy (E) is given by the formula DE / E = k / 2 where k is the variation in amplitude of the current oscillations.
7. Dispositif pour la mise en œuvre du procédé de pilotage selon l’une des revendications précédentes à partir d’un courant continu délivré par une batterie (1) embarquée, caractérisé en ce qu’il comprend un circuit électronique (2) convertissant le courant continu (DC) en un courant alternatif (AC) destiné à alimenter les modules (3) d’éclairage et de signalisation du véhicule. 7. Device for implementing the control method according to one of the preceding claims from a direct current delivered by an on-board battery (1), characterized in that it comprises an electronic circuit (2) converting the direct current (DC) into alternating current (AC) intended to supply the vehicle's lighting and signaling modules (3).
8. Véhicule automobile à économie d’énergie équipé de modules (3) d’éclairage et de signalisation pilotés au moyen du procédé selon l’une des revendications 1 à 6. 8. Energy-saving motor vehicle equipped with lighting and signaling modules (3) controlled by means of the method according to one of claims 1 to 6.
PCT/FR2020/051637 2019-10-17 2020-09-21 Method for controlling lighting and signaling modules for motor vehicles WO2021074496A1 (en)

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EP20785820.0A EP4046464A1 (en) 2019-10-17 2020-09-21 Method for controlling lighting and signaling modules for motor vehicles
CN202080072562.0A CN114557131A (en) 2019-10-17 2020-09-21 Control method for controlling a lighting and signaling module of a motor vehicle

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FR1911633A FR3102334B1 (en) 2019-10-17 2019-10-17 Method for controlling lighting and signaling modules for motor vehicles
FRFR1911633 2019-10-17

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6443602B1 (en) * 1999-03-01 2002-09-03 Stanley Electric Company Vehicle headlamp device
EP2261081A1 (en) 2009-06-09 2010-12-15 Automotive Lighting Reutlingen GmbH Method for operating a lighting device
FR2983143A1 (en) 2011-11-24 2013-05-31 Renault Sa Method for controlling e.g. lighting system of e.g. electric car, involves estimating correction parameter value of luminosity according to received speed value to control power supply of projector of lighting system
EP2741578B1 (en) 2012-12-07 2017-06-07 Nxp B.V. LED current and dimming control using hysteresis comparatoradjustment of hysteresis upper and lower threshold levels

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6443602B1 (en) * 1999-03-01 2002-09-03 Stanley Electric Company Vehicle headlamp device
EP2261081A1 (en) 2009-06-09 2010-12-15 Automotive Lighting Reutlingen GmbH Method for operating a lighting device
FR2983143A1 (en) 2011-11-24 2013-05-31 Renault Sa Method for controlling e.g. lighting system of e.g. electric car, involves estimating correction parameter value of luminosity according to received speed value to control power supply of projector of lighting system
EP2741578B1 (en) 2012-12-07 2017-06-07 Nxp B.V. LED current and dimming control using hysteresis comparatoradjustment of hysteresis upper and lower threshold levels

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FR3102334B1 (en) 2022-04-29
CN114557131A (en) 2022-05-27
FR3102334A1 (en) 2021-04-23

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