CN114557131A - Control method for controlling a lighting and signaling module of a motor vehicle - Google Patents
Control method for controlling a lighting and signaling module of a motor vehicle Download PDFInfo
- Publication number
- CN114557131A CN114557131A CN202080072562.0A CN202080072562A CN114557131A CN 114557131 A CN114557131 A CN 114557131A CN 202080072562 A CN202080072562 A CN 202080072562A CN 114557131 A CN114557131 A CN 114557131A
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- China
- Prior art keywords
- current
- lighting
- oscillation
- intensity
- motor vehicle
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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
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- 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
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- 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
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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 operating a lighting module of a motor vehicle, comprising at least one electroluminescent diode supplied by a current, characterized in that the intensity (I) of the current is maintained at a constant voltage (U)0) With an oscillation period (T) between 30s and 60s0) Varies sinusoidally.
Description
Technical Field
The present invention claims priority from french application 1911633 filed on 17.10.2019, the contents of which (text, drawings and claims) are incorporated herein by reference. The invention is applied to the control of lighting and signal modules for motor vehicles.
More particularly, the invention relates to a steering method for steering lighting and signal modules to reduce energy consumption.
Background
Lighting and signaling modules (headlamps, daytime running lights, etc.) generally comprise an illumination light source (halogen, xenon, LED) controlled by an electronic card (PCB) and associated with various optical components (lenses, reflectors, etc.), entirely for packaging in a housing.
Headlights and vehicle lamps with LEDs are generally powered and operated by electrical energy with a constant power (stabilized current and constant voltage), the power (P) being determined by the product of the intensity (1) of the current and the voltage (U).
In addition, the energy consumption (E) of the electrical system is constant and is calculated by the formula (E) power (P) x duration (T). Nowadays, however, the automotive industry is forced to strongly reduce the energy consumption of vehicles in order to reduce the emission of carbon dioxide, without however agreeing to significantly limit the performance and characteristics of lighting systems.
In particular, a method for reducing energy consumption is known from patent applications FR2983143 and EP2261081, which aim at reducing the intensity of the electric current while maintaining said current constant, so that the resulting light variations continue to comply with the regulatory thresholds without being perceived by the user of the vehicle.
Patent EP2741578B1 describes a control loop and a control method for operating an LED, which aim at delivering a signal for adjusting a reference current source to thereby vary the voltage of the output current in a determined range.
In addition, in older generation vehicles, the alternator was not sufficiently stabilized, which resulted in strength variations. However, these variations are neither intentional nor mastered, and are not relevant to the optional electrical consumption reduction goal that is not hot.
Thus, in the present context, the aim of the invention is to simultaneously achieve, in a periodic cycle, a significant reduction in energy consumption that achieves the best performance (illumination range, brightness perception, beam width, etc.) and takes into account the legal limits of permission, but the user of the vehicle does not perceive the change significantly and does not cause a degradation of the safety conditions.
Disclosure of Invention
According to the invention, this object is achieved by means of a control method for controlling a lighting module of a motor vehicle, comprising at least one light-emitting diode (LED) supplied by a direct current, characterized in that the intensity of the current is varied sinusoidally at a constant voltage with an oscillation period between 30s and 60 s.
According to a preferred embodiment of the method of the invention, the intensity of said current is made to vary according to a rule as a function of time; i ═ I0-kI0sin2(2πt/T0) Where k is the oscillation amplitude variation of the current and T0Is the period of oscillation.
According to an advantageous feature of the method, the intensity of the current is varied between 0.7A and 1.1A.
According to another feature, the oscillation amplitude variation is less than or equal to 20%.
According to an embodiment variant of the method, it is envisaged that, at a constant voltage, the power of the current is made to vary according to a law as a function of time; p ═ I0U0-kI0U0sin2(2πt/T0) Where k is the oscillation amplitude variation of the current and T0Is the period of oscillation.
According to another characteristic of the invention, the reduction of the electrical energy consumption E is given by the formula Δ E/E ═ k/2, where k is the oscillation amplitude variation of the current.
Another object of the present invention is to provide a device for implementing the maneuvering method defined above, based on direct current delivered by a vehicle battery, characterized in that it comprises an electronic circuit that converts said Direct Current (DC) into Alternating Current (AC) for powering lighting and signaling modules of the vehicle.
Another object of the present invention is also to provide an energy-saving motor vehicle equipped with lighting and signaling modules operated by means of the operating method according to any one of the preceding claims.
The sinusoidal function of the intensity of the current (or the power of the current) is a simple function obtained by conventional AC/DC signal conversion methods, which is differentiable and continuous and does not cause a significant change in the visual appearance of the beam to the observer.
The invention has significant technical and economic benefits, since due to the manipulation method, an energy saving of about 10% can be obtained.
Moreover, thanks to the use of a sinusoidal function, the intensity of the current varies in a range of values smaller than the intensity of the stabilized current (typically 0.8A), which enables to reduce the number of LEDs and therefore the cost of the lighting module.
Drawings
Other features and advantages of the present invention will become more apparent upon reading the following detailed description of the invention and the accompanying drawings in which:
FIG. 1 is a graph showing the stable electrical supply profile (current I) as a function of time t (in seconds)0Sum voltage U0) The pattern of (2).
FIG. 2 is a graph showing the sinusoidal supply profile of the method according to the invention, over a period T of the same time T as in FIG. 10With varying intensity (I) and maximum current reduction amplitude k (%).
Fig. 3 is a general schematic view of a device capable of ensuring the implementation of the method for operating a lighting module of the invention.
Fig. 4 shows an embodiment of an electronic circuit capable of generating a sinusoidal steering signal based on a direct current signal.
For purposes of clarity, the same or similar elements are identified throughout the drawings by the same reference numerals.
Detailed Description
Naturally, the embodiments of the method of the invention shown by the above figures and described in the following are given as non-limiting examples only. According to the invention, it is expressly provided that different embodiments can be provided and that combinations can be made between these different embodiments.
The method of the invention is used for operating lighting and/or signaling modules of a motor vehicle in order to save energy.
Such a module 3 (for example a headlight), schematically shown in fig. 3, typically comprises at least one light source, for example an electroluminescent diode (LED) powered by a stabilized direct current delivered by the on-board battery 1. This current (with a voltage U of typically 12V) has a profile as shown in fig. 1.
The supply voltage U of this current is therefore constant (reference U)0) And the power P is the product of the intensity of the current and the voltage of the current (P ═ U)0xI) is determined. The energy consumption E of the lighting module is also constant and is calculated from the product of the power of the lighting module and time (E-Pxt).
The steering method of the invention is intended to operate by making the intensity of said current with a long oscillation period (T) between 30s and 60s0) Sinusoidally varying a supply current profile of the lighting module. Under these conditions, the power oscillations are neither perceptible nor obstructive to the activity to the driver of the vehicle or to drivers of other vehicles.
The specific profile of the method according to the invention for the electrical supply of the modules is shown in fig. 2. This profile corresponds to the oscillation of the intensity I (in amperes) of said current, with a peak value of current reduction k of 0.2 (-20%). These oscillations are caused by a sinusoidal function (a) of the current: i (t) ═ I0-kI0sin2(2πt/T0) Where k is the oscillation amplitude variation of the current and T0Is the period of oscillation.
This variation in the intensity of the current necessarily results in a variation in the power P (in watts) governed by the equation (B): p (t) is I0U0-kI0U0sin2(2πt/T0) Where k is the oscillation amplitude variation of the current and T0Is the period of oscillation.
From a legislative point of view, this power variation complies with the permitted range of variation and can be obtained by means of, for example, conventional oscillators.
The supply profile corresponding to the sinusoidal function of fig. 2 results in an energy saving Δ E given by equation (C) (fig. 2) and expressed as a ratio (D): and delta E/E is k/2.
Thus, a current intensity change with an amplitude of k-20% can save 10% of the energy in the selected period cycle, independently of the oscillation period, as shown in equation (C).
The sinusoidal profile of the current variation can be approximately synthesized by means of a mathematical function integrated with polynomials, splines, etc., while bringing about a technical effect similar to that produced by the sinusoidal function (a).
A system capable of implementing the steering method of the present invention is schematically illustrated by fig. 3. The main power supply is constituted by a battery 1 of the vehicle, which delivers a stabilized Direct Current (DC) having a voltage U0Is 12V.
The intensity of this current is converted into an alternating current signal (AC) by a converter 2 (or "driver"), which comprises an electronic circuit of the type shown in fig. 4. The converted signals are then sent to the lighting and signaling module 3, in particular to the headlights and the vehicle lights 4 with electroluminescent diodes (LEDs), as illustrated by fig. 3 and 4.
Claims (8)
1. A method for operating a lighting module of a motor vehicle, said lighting module comprising at least one electroluminescent diode supplied by an electric current, characterized in that the intensity (I) of said electric current is made at a constant voltage (U)0) With an oscillation period (T) between 30s and 60s0) Varies sinusoidally.
2. Steering method according to claim 1, characterized in that the intensity (I) of the current is made to vary according to a rule (a) as a function of time; i ═ I0-kI0sin2(2πt/T0) Wherein k is the numberOscillation amplitude of the flow varies and T0Is the period of oscillation.
3. The method according to claim 2, characterized in that the intensity of the current is varied between 0.7A and 1.1A.
4. Operating method according to any one of the preceding claims, characterised in that it is carried out at a constant voltage (U)0) -varying the power (P) of said current according to a law as a function of time; p ═ I0U0-kI0U0sin2(2πt/T0) Where k is the oscillation amplitude variation of the current and T0Is the period of oscillation.
5. Steering method according to any one of the preceding claims, characterized in that the oscillation amplitude variation (k) is less than or equal to 20%.
6. Steering method according to any one of the preceding claims, characterized in that the reduction of the electrical energy consumption (E) is given by the formula Δ E/E-k/2, where k is the oscillation amplitude variation of the current.
7. A device for implementing a steering method according to any one of the preceding claims, based on direct current delivered by an on-board battery (1), characterized in that it comprises an electronic circuit (2) which converts the Direct Current (DC) into Alternating Current (AC) for powering the lighting and signaling modules (3) of the vehicle.
8. An energy-saving motor vehicle equipped with a lighting and signaling module (3) which is operated by means of the operating method according to any one of claims 1 to 6.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1911633A FR3102334B1 (en) | 2019-10-17 | 2019-10-17 | Method for controlling lighting and signaling modules for motor vehicles |
| FRFR1911633 | 2019-10-17 | ||
| PCT/FR2020/051637 WO2021074496A1 (en) | 2019-10-17 | 2020-09-21 | Method for controlling lighting and signaling modules for motor vehicles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114557131A true CN114557131A (en) | 2022-05-27 |
Family
ID=69699985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080072562.0A Pending CN114557131A (en) | 2019-10-17 | 2020-09-21 | Control method for controlling a lighting and signaling module of a motor vehicle |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4046464A1 (en) |
| CN (1) | CN114557131A (en) |
| FR (1) | FR3102334B1 (en) |
| WO (1) | WO2021074496A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4171127B2 (en) * | 1999-03-01 | 2008-10-22 | スタンレー電気株式会社 | Automotive headlamp device |
| DE102009024352A1 (en) | 2009-06-09 | 2010-12-16 | Automotive Lighting Reutlingen Gmbh | Method for operating a lighting device |
| FR2983143B1 (en) | 2011-11-24 | 2014-08-08 | Renault Sa | CONTROL OF LIGHTING SYSTEM OF VEHICLE |
| 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 |
-
2019
- 2019-10-17 FR FR1911633A patent/FR3102334B1/en active Active
-
2020
- 2020-09-21 EP EP20785820.0A patent/EP4046464A1/en active Pending
- 2020-09-21 WO PCT/FR2020/051637 patent/WO2021074496A1/en unknown
- 2020-09-21 CN CN202080072562.0A patent/CN114557131A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP4046464A1 (en) | 2022-08-24 |
| WO2021074496A1 (en) | 2021-04-22 |
| FR3102334B1 (en) | 2022-04-29 |
| FR3102334A1 (en) | 2021-04-23 |
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