Projector unit

Abstract

The invention relates to a projector unit (1) comprising a cooling circuit (2a, 2b) provided with at least two air circulation ducts (3a, 3b, 3c, 3d, 3e) connected to at least one shared device (4) for generating an air flow, notably a ventilator, and further provided with at least one element (5a, 5b, 5c) for varying a proportion of the air flow distributed to each of the at least two ducts (3a, 3b, 3c, 3d, 3e).

Description

[0001] The present invention relates to a projector block and a method for managing air circulation in this projector block as well as a system for implementing this method.

[0002] The invention also relates to a vehicle, in particular a motor vehicle comprising such a management system.

[0003] The invention also relates to a computer program comprising program code instructions for executing the steps of this process.

[0004] Automotive headlight units must be cooled, especially if they include several lighting modules, to avoid any malfunction that could lead to a reduction or even a total loss of the lighting function provided by them.

[0005] To do this, with reference to the figure 1In the prior art, headlight units 100 are known, comprising a housing 104 and a lens 105 defining an enclosure 106 in which are included a cooling circuit 101, a fan 102 and lighting modules 103a, 103b. In these headlight units 100, the cooling circuit 101 connects the fan 102 to the lighting modules 103a, 103b of these units 100. Such a fan 102 operates as soon as the vehicle engine is running and allows a constant flow of air to be diffused towards these lighting modules 103a, 103b.

[0006] However, one of the drawbacks of such headlight units 100 is that the cooling of the lighting modules 103a, 103b is not optimized. Indeed, the constant airflow provided by this fan 102 does not allow the cooling of the lighting modules 103a, 103b to be adapted to changes in ambient temperatures to which the vehicle, and therefore the headlight unit 100, may be subjected, nor to the operating conditions of the lighting modules 103a, 103b.

[0007] Furthermore, such headlight units 100 are often subject to condensation phenomena that appear on their lens 105 and manifest as droplets on the inner surface of this lens 105. This phenomenon occurs under certain temperature conditions, particularly during thermal shock caused by a significant temperature difference between, on the one hand, the hot temperature from the engine (especially for a headlight unit located at the front of the vehicle) and, on the other hand, the potentially low outside temperature. Such condensation phenomena are often the cause of malfunctions in these headlight units 100, resulting from damage induced by the presence of high humidity within the housing 106 of these units 100, linked to these phenomena.Furthermore, the appearance of these condensation phenomena at the level of the glass 105 of the projector block 100 often leads the vehicle owner to perceive a degradation of the aesthetic appearance of this projector block 100 which inevitably leads to dissatisfaction on the part of the latter followed by a return of this vehicle to the after-sales service of the car manufacturer.

[0008] Patent application US2016 / 0208997 A1 describes a cooling system for cooling a low-speed projector block by diverting air intended for engine cooling.

[0009] Patent application DE 10 2008 062 827 A1 describes a projector with a cooling circuit according to the preamble of claim 1.

[0010] The present invention aims to overcome these drawbacks related to the prior art.

[0011] One of the aims of the invention is to improve the cooling of projector blocks comprising several lighting modules.

[0012] Another aim of the invention is to reduce, or even eliminate, condensation phenomena in projector blocks.

[0013] To this end, the invention relates to a projector unit comprising: a cooling circuit provided with at least two air circulation ducts connected to at least one same airflow generation device, in particular a fan, and provided with at least one element for varying a proportion of the airflow distributed in each of said at least two ducts - - at least two lighting modules, and a clean air circulation duct connected to each lighting module.

[0014] The projector block is remarkable in that said at least one variation element is a movable wall arranged in a junction zone of an air inlet duct of said cooling circuit with said at least two air circulation ducts.

[0015] In other embodiments: the projector unit includes a lens and at least one lighting module and includes an air circulation duct the end of which is connected to the lens and at least one separate air circulation duct the end of which is connected to at least one lighting module; said at least one airflow generation device is connected to an air inlet duct of said cooling circuit.

[0016] The invention also relates to a method for managing air circulation in this projector block, comprising a step of varying the proportion of the airflow distributed in each of said at least two air circulation ducts of the cooling circuit of the projector block.

[0017] Advantageously, the variation step includes a substep of configuring the cooling circuit in a first operating mode in which all the airflow is guided to a single lighting module or a mirror or in a second operating mode in which the airflow is shared between at least two air circulation ducts.

[0018] In particular, the configuration substep takes into account all or part of the following data: the on or off state of each lighting module; the temperature of at least one lighting module; the temperature inside the projector and / or outside; the humidity level measured in the external environment of the projector block.

[0019] The invention also relates to a system for managing air circulation in such a projector block implementing this method, the system comprising a control unit controlling at least one element for varying a proportion of the airflow distributed in each of said at least two ducts of the cooling circuit of the projector block.

[0020] Advantageously, the system includes at least one airflow generation device, in particular a centrifugal fan, at least one temperature sensor, at least one temperature sensor and / or at least one humidity sensor measuring respectively the temperature and humidity levels present in the external environment of the projector unit and / or at least one temperature sensor included in an enclosure of the projector unit.

[0021] In particular, the management system includes at least one temperature sensor arranged in a lighting module of said projector block.

[0022] The invention also relates to a vehicle, in particular a motor vehicle, comprising at least one such projector.

[0023] The invention also relates to a computer program comprising program code instructions for executing the steps of this process when said program is executed by a control unit of this management system.

[0024] Other advantages and features of the invention will become clearer upon reading the description of a preferred embodiment which follows, with reference to the figures, provided by way of illustrative and non-limiting example: there figure 1 is a graphical representation of a projector block including a prior art cooling circuit; the figure 2 is a graphical representation of a projector block comprising a first variant of a cooling circuit provided with a single variable element, according to the embodiment of the invention; the figure 3is a graphical representation of the first variant of the cooling circuit configured in a first operating mode, according to the embodiment of the invention; the figures 4 , 5 and 6 are graphical representations of the first variant of the cooling circuit configured in a second operating mode, according to the embodiment of the invention; the figure 7 is a graphical representation of the projector block comprising a second variant of the cooling circuit configured in the first operating mode and comprising two variation elements, according to the embodiment of the invention; the figure 8 is a graphical representation of the projector block comprising the second variant of the cooling circuit configured in the second operating mode and comprising two variation elements, according to the embodiment of the invention; there figure 9is a graphical representation of an airflow management system in the projector block, according to the embodiment of the invention, and the Figure 10 is a flowchart relating to a method for managing airflow in the projector unit, according to the embodiment of the invention

[0025] In the description that follows, identical reference numbers denote identical parts or parts with similar functions.

[0026] On the figures 2 , 7 and 8 Figure 1 represents an embodiment of a projector unit 1 capable of emitting light. This projector unit 1 is preferably arranged in a vehicle, for example a marine, aerial, or land vehicle. Alternatively, it can be included in an interior or exterior lighting system of a building or in a public lighting system.

[0027] In this embodiment, the vehicle in which this projector unit 1 is installed is preferably a motor vehicle. In this context, the projector unit 1 is located at the rear or front of the vehicle.

[0028] Such a projector block 1 essentially comprises a housing 8 defining an opening closed by a transparent glass 9 capable of being traversed by the light rays emitted by at least one lighting module 12a, 12b of this projector block 1.

[0029] The housing 8 and the lens 9, thus assembled, together define an enclosure 11 for this projector unit 1, comprising each lighting module 12a, 12b. This projector unit 1 preferably comprises two lighting modules 12a, 12b, which may, for example, correspond to a high beam module and a low beam module. It is understood that this projector unit 1 may also include other lighting modules such as a daytime running light module or a position light module. This enclosure 11 may also include at least one temperature sensor 13 for the lens 9, preferably arranged at a distance from the lighting modules 12a, 12b.

[0030] In this projector block 1, each lighting module 12a, 12b includes a light source such as, in particular, an electric bulb, a halogen lamp, a xenon lamp, one or more light-emitting diodes, or one or more laser diodes. The lighting module 12a, 12b may also include at least one temperature sensor 15.

[0031] The projector unit 1 also includes a cooling circuit 2a, 2b provided with at least two air circulation ducts 3a, 3b, 3c, 3d, 3e connected via an air inlet duct 7 to at least one airflow generation device 4. The air circulation ducts 3a, 3b, 3c, 3d, 3e may be connected to the same airflow generation device 4 or to several such devices 4. The inlet duct 7 includes an end provided with an inlet opening for the cooling circuit 2a, 2b through which air enters the latter. As regards the said at least two air circulation ducts 3a, 3b, 3c, 3d, 3e, they each include an end provided with an outlet opening of the cooling circuit 2a, 2b allowing the air circulating in this circuit 2a, 2b to be evacuated towards the lighting modules 12a, 12b and / or the glass 9 of the projector block 1.

[0032] This projector block 1 has two cooling circuit variants 2a, 2b. The difference between the first and second variants lies in the presence of an air circulation duct 3e in this second variant which is intended to direct an airflow or a proportion thereof towards the lens 9 of the projector block 1.

[0033] In the first variant visible on the figures 2 to 6 The cooling circuit 2a includes the air inlet duct 7, which is connected at a junction zone 6 to two air circulation ducts 3a, 3b. In this configuration, the end of each of these air circulation ducts 3a, 3b is connected to the corresponding lighting module 12a, 12b of the projector block 1. It is understood here that this first variant of the cooling circuit 2a preferably includes as many air circulation ducts 3a, 3b as the projector block 1 advantageously includes lighting modules 12a, 12b.

[0034] In the second variant visible on the figures 7 and 8 , the cooling circuit 2b also includes the air inlet duct 7 which is connected at a junction area 6 to three air circulation ducts 3c, 3d, 3e. In this configuration, the ends of two 3c, 3d of these three air circulation ducts 3c, 3d are connected to the lighting modules 12a, 12b of the projector block 1, the end of the remaining air circulation duct 3e being arranged near the lens 9 of this projector block 1. In particular, the outlet opening of this end of the air circulation duct 3e is preferably positioned opposite said lens 9. In addition, in addition to the remaining air circulation duct 3e, this second variant of the cooling circuit 2b preferably includes as many air circulation ducts 3c, 3d as the projector block 1 includes lighting modules 12a, 12b.

[0035] This projector block 1 also includes at least one variation element 5a, 5b, 5c for the proportion of the airflow distributed in each of the at least two ducts 3a to 3e of the first or second variant of the cooling circuit 2a, 2b. More specifically, the first variant of this cooling circuit 2a includes a single variation element 5a and the second variant of this circuit 2b includes two variation elements 5b, 5c.

[0036] In these two variants of the cooling circuit 2a, 2b, each variable element 5a, 5b, 5c is a movable partition arranged in whole or in part in the junction zone 6 of the air inlet duct 7 with said at least two air circulation ducts 3a, 3b, 3c, 3d, 3e. This movable partition comprises a body that preferably extends straight between two ends 17 of this partition. This partition is mounted to rotate freely in the first and second variants of the cooling circuit 2a, 2b. To do this, the first end 17 of this wall is fixed in these first and second variants of the cooling circuit 2a, 2b in a connection region 6b of two air circulation ducts 3a, 3b, 3c, 3d, 3e between them, said connection region 6b being included in the junction zone 6. Thus the first end 17 defines an axis of rotation around which the movable wall is likely to be moved.In other words, this axis of rotation is located within the connection region 6b between the two air circulation ducts 3a, 3b, 3c, 3d, 3e. It should be noted that the movable wall has a surface area that is substantially greater than or equal to the cross-sectional area of ​​each air circulation duct 3a, 3b, 3c, 3d, 3e included in the two cooling circuit variants 2a, 2b; specifically, a circular surface area, since these ducts 3a, 3b, 3c, 3d, 3e each have a circular cross-section. It should also be noted that this wall can be coupled to an actuation device such as an electric motor to achieve its movement within the cooling circuit 2a, 2b.

[0037] In the projector unit 1, the airflow generation device 4 may be a fan, in particular an axial fan arranged in the air inlet duct 7. This axial fan is capable of generating an airflow in the cooling circuit 2a, 2b by drawing in air entering through the inlet opening of the circuit 2a, 2b and propelling it into the circuit parallel to the fan's axis of rotation. In other variants, this fan may be centrifugal or comprise any device capable of blowing air.

[0038] With reference to the figure 9The invention also relates to an airflow management system 10 within the headlight assembly 1. This management system 10 comprises a control unit 18 driving at least one variable element 5a, 5b, 5c. It also comprises at least one temperature sensor 13, 15 arranged within the headlight assembly 1 and at least one variable element 5a, 5b, 5c, as well as at least one airflow generation device 4. In addition, the system 10 may also include at least one temperature sensor 19 and at least one humidity sensor 14 measuring, respectively, the temperature and humidity level present in the external environment of the headlight assembly, i.e., in the external environment of the vehicle as defined at an outer face of the lens 9 of this headlight assembly 1.

[0039] In this management system 10, the control unit 18 includes hardware and software resources, more specifically at least one processor cooperating with memory elements 20. The control unit 18 is capable of executing instructions for the implementation of a computer program.

[0040] One such control unit 18 is connected to each: temperature sensor 13, 15, 19; humidity sensor 14; variation element 5a, 5b, 5c, and airflow generation device 4.

[0041] It should be noted that in this management system 10, the airflow generation device 4, as previously mentioned, can be located inside the projector unit 1, within the air intake duct 7. Alternatively, it can be positioned outside the unit, connected to the inlet opening of the air intake duct 7. In this latter case, this generation device 4 can be a fan, specifically a centrifugal fan. Such a centrifugal fan is then capable of generating airflow in the cooling circuit 2a, 2b by drawing in air parallel to the fan's axis of rotation and propelling it by centrifugal force perpendicular to this same axis.

[0042] With reference to the Figure 10 , such a management system 10 is capable of implementing a process for managing air circulation in the projector block 1.

[0043] This process includes a start-up step 22 for at least one airflow generation device 4. This step 22 is preferably carried out by the control unit 18 as soon as the latter detects that the vehicle engine has started. Alternatively, such a step 22 may include conditions for initiating this start-up of the airflow generation device 4 which are linked, for example, to the detection of heating of one of the lighting modules 12a, 12b of the headlight assembly 1, or to the detection of condensation 32 appearing on the lens 9 of the headlight assembly 1 when the latter includes the second variant of the cooling circuit 2b.

[0044] The process then involves a variation step 23 of a proportion of the airflow distributed in each of the said at least two ducts 3a to 3e of the cooling circuit 2a, 2b of the projector block 1.

[0045] Such a step 23 includes a configuration substep 24 of the cooling circuit 2a, 2b in a first operating mode. The first operating mode provides for the direction of all the airflow generated by the airflow generation device 4 into one or the other of said at least two air circulation ducts 3a, 3b, 3c, 3d, 3e. In other words, in this first operating mode, the proportion of flow distributed in either of these at least two ducts can be zero. Thus, in the first and second variants of the cooling circuit 2a, 2b, all the airflow is then directed towards one or the other of the lighting modules 12a, 12b connected to the ends of two air circulation ducts 3a, 3b, 3c, 3d. This first operating mode is illustrated, for example, in the figure 3when the projector block 1 includes the first variant of the cooling circuit 2a. In addition, in the second variant 2b and with reference to the figure 7 , all this airflow can be directed towards the glass 9 of the projector block 1.

[0046] This substep 24 may include a detection phase 25 of a heating of one of the lighting modules 12a, 12b of the projector block 1 connected to one of said at least two air circulation ducts 3a, 3b, 3c, 3d. During this phase 25, temperatures T1, T2 of the lighting modules 12a, 12b of the projector block 1 are measured from the temperature sensors 15 included in these lighting modules 12a, 12b. Subsequently, each of these temperatures T1, T2 is transmitted to the control unit 18 in order to be compared to a threshold temperature Ts included in the memory elements 20 of this control unit 18.If one of these temperatures T1, T2 is above the threshold temperature Ts, then the corresponding lighting module 12a, 12b has an abnormal and / or detrimental increase in its temperature and the configuration substep 24 then provides in these conditions for the execution of a control phase 26 of at least one variation element 5a, 5b, 5c of the projector block 1, so as to induce the cooling of the lighting module concerned.

[0047] During this piloting phase 26, the control unit 18 then drives at least one variable element 5a, 5b, 5c to direct all the airflow towards the lighting module 12a, 12b, which is experiencing this heating. In the case of the first variant of the cooling circuit 2a, the variable element 5a is driven so as to be in a position that blocks the air circulation duct 3a, 3b connected to the lighting module 12a, 12b, which is not experiencing heating. In the case of the second variant of this circuit 2b, the two variation elements 5b, 5c are controlled by the control unit 18 so as to be in closing positions of the air circulation duct 3e capable of conducting the airflow at the level of the glass 9 of the projector block 1 as well as of the air circulation duct 3c, 3d connected to the lighting module 12a, 12b not showing any heating.

[0048] When the projector block 1 includes the second variant of the cooling circuit 2b, this substep 24 may also include, in addition to the preceding detection phase 25, a detection phase 27 of a condensation phenomenon 32 appearing on the glass 9 of the projector block 1. During this phase 27, the control unit 18 determines a temperature Tg of the glass 9 of the projector block 1 and then compares it to a threshold temperature Tr. This threshold temperature Tr is a dew point temperature, also called " dew pointwhich is determined prior to the detection phase 27 or during the execution of this phase 27. This threshold temperature Tr can be determined by the control unit 18 from temperatures and humidity levels measured in the external environment of the projector block 1 and by applying well-known prior art equations for determining the dew point temperature, such as the Heinrich Gustav Magnus-Tetens equation. If the temperature Tg of the glass 9 is lower than this threshold temperature Tr, then a condensation phenomenon 32 is present on this glass 9 of the projector block 1.

[0049] In this context, configuration substep 24 then provides, following this detection phase 27, for the execution of a control phase 28 of the variation elements 5b, 5c of the projector block 1. During this control phase 28, the control unit 18 then controls the two variation elements 5b, 5c in order to direct all the airflow towards the lens 9 of the projector block 1. Thus, with reference to the figure 8 , the two variation elements 5b, 5c are controlled by the control unit 18 so as to be in closing positions of the air circulation ducts 3c, 3d connected to the lighting modules 12a, 12b.

[0050] As a complement to or alternative to a temperature measurement, configuration substep 24 can take into account the state of a lighting module (on or off), to provide cooling only when it is on.

[0051] Subsequently, variation step 23 includes a configuration substep 29 of the cooling circuit 2 in a second operating mode. This second operating mode provides for the diffusion of the airflow generated by the airflow generation device 4 into said at least two air circulation ducts 3a, 3b, 3c, 3d, 3e, according to a non-zero variable proportion of this flow distributed in each of these at least two air circulation ducts 3a, 3b, 3c, 3d, 3e.

[0052] This substep 29 comprises, when the projector block 1 is equipped with the first variant of the cooling circuit 2a, a control phase 30 of the dimming element 5a based on the temperatures T1, T2 of the lighting modules 12a, 12b of the projector block 1. During this phase 30, the dimming element 5a is controlled by the control unit 18 based on the temperatures T1, T2 of the lighting modules 12a, 12b. These temperatures T1, T2 of the lighting modules 12a, 12b are measured and transmitted periodically to the control unit 18 which, for example from mapping data 21, determines the position of each dimming element 5a in the cooling circuit 2a.These mapping data 21, which are archived in the memory elements 20 of the controlled unit 18 and come, for example, from empirical data, define different positions of the variation element 5a as a function of the measured temperatures T1, T2 of the lighting modules 12a, 12b of the projector block 1. Thus, depending on these temperatures T1, T2, the variation element 5a can then be configured in different positions by distributing a substantially equal proportion of the airflow in each of the air circulation ducts 3a, 3b, as illustrated in the . figure 4 , or by distributing a larger proportion of air towards one of these two ducts 3a, 3b, as represented by the figures 5 and 6 .

[0053] When the projector unit 1 is equipped with the second variant of the cooling circuit 2b, the configuration substep 29 includes a control phase 31 of at least one variable element 5b, 5c based on the temperatures T1, T2 of the lighting modules 12a, 12b of the projector unit 1 and the detection of condensation 32 on the glass 9 of the projector unit 1. During this phase 31, at least one variable element 5b, 5c is controlled by the control unit 18 based on the temperatures T1, T2 of the lighting modules 12a, 12b and the detection of the occurrence of condensation 32. The temperatures T1, T2 of the lighting modules 12a, 12b are measured and transmitted periodically to the control unit 18. The parameters for detecting the occurrence of condensation 32 in this projector unit 1 are also determined and transmitted periodically to this control unit 18.These determined parameters may include, as previously discussed, estimated ice temperatures 9 of projector block 1 and / or measured temperatures and humidity levels in the external environment of projector block 1. The control unit 18, based on the measured temperatures T1, T2, and the result of comparing the ice temperature Tg to the threshold temperature Tr, as well as mapping data 21, then determines the position of each variation element 5b, 5c in the cooling circuit 2b. Thus, the variation element 5b, 5c can then be configured in different positions by distributing a substantially equal proportion of the airflow into each of the air circulation ducts 3c to 3e or into two air circulation ducts 3c, 3d, as illustrated in Figure 1. figure 7 or by distributing a larger proportion of air towards one of these three ducts 3c to 3e.

[0054] The invention also relates to a computer program comprising program code instructions for the execution of steps 22, 23 of this process when said program is executed by the control unit 18 of the management system 10.

[0055] Thus, the invention improves the cooling of the projector unit 1 by distributing a proportion of the airflow generated by the airflow generation device 4 into each air circulation duct 3a to 3e of the cooling circuit 2a, 2b. This proportion is defined according to the position of at least one variable element 5a, 5b, 5c and is precisely determined based on the requirements of components of the projector unit 1, such as the lighting modules 12a, 12b and the lens 9 of this unit, which are capable of receiving this proportion of the airflow. These requirements correspond to the need to cool the lighting modules 12a, 12b and / or to reduce or even eliminate condensation 32.A projector equipped with such a cooling circuit according to the invention thus enables intelligent cooling management, allowing for compromises to be made to optimize cooling efficiency from a single cooling source, for example, a single fan. The management system can therefore best handle all extreme situations. For example, in a situation where no lighting module is used and there is no condensation, the airflow generation device can be stopped: this reduces energy consumption while increasing the lifespan of the airflow generation device.In a second situation in which all modules are used and possibly there is a condensation phenomenon, the management system can share the cooling between the different components in a precise proportion adapted to the needs of each component, or even make trade-offs to maintain an acceptable safety situation.

[0056] Furthermore, the invention has the advantage of being compact and having a low implementation cost.

Claims

1. Headlight unit (1) including: - a cooling circuit (2a, 2b) provided with at least two air circulation pipes (3a, 3b, 3c, 3d, 3e) linked to at least a same device for generating (4) an air flow, particularly a fan, and provided with at least one element for varying (5a, 5b, 5c) a proportion of the air flow, which proportion is distributed into each of said at least two pipes (3a, 3b, 3c, 3d, 3e) - at least two lighting modules (12a, 12b) and - each lighting module (12a, 12b) being connected to one of the air circulation pipes (3a, 3b) specific to it, characterized in that said at least one varying element (5a, 5b, 5c) is a mobile wall arranged in a junction zone (6) of an air inlet pipe (7) of said cooling circuit (2a, 2b) with said at least two air circulation pipes (3a, 3b, 3c, 3d, 3e).

2. Headlight unit (1) according to any one of the preceding claims, characterized in that it includes an outer lens (9) and in that it includes a separate air circulation pipe (3e), the end of which is connected to the outer lens (9).

3. Headlight unit (1) according to any one of the preceding claims, characterized in that said at least one device for generating (4) an air flow is linked to an air inlet pipe (7) of said cooling circuit (2a, 2b).

4. Method for managing an air circulation in a headlight unit (1) according to any one of the preceding claims, characterized in that it includes a step for varying (23) the air flow proportion distributed into each of said at least two air circulation pipes (3a, 3b, 3c, 3d, 3e) of the cooling circuit (2a, 2b) of the headlight unit (1).

5. Method according to the preceding claim, characterized in that the varying step (23) includes a sub-step for configuring (24) the cooling circuit (2a, 2b) in a first mode of operation in which the entire air flow is guided towards a single lighting module (12a, 12b) or an outer lens (9) or in a second mode of operation in which the air flow is split between at least two air circulation pipes (3a, 3b, 3c, 3d, 3e).

6. Method according to one of Claims 4 and 5, characterized in that the configuring sub-step (24) takes into account all or some of the following data: - the on or off state of each lighting module (12a, 12b); - the temperature of at least one lighting module (12a, 12b); - the temperature inside the headlight and / or outside; - the humidity level measured in the outer environment of the headlight unit (1).

7. System for managing (10) an air circulation in a headlight unit (1) according to any one of Claims 1 to 3 implementing the method according to any one of Claims 4 to 6, including a control unit (18) driving at least one element for varying (5a, 5b, 5c) a proportion of the air flow, which proportion is distributed into each of said at least two pipes (3a, 3b, 3c, 3d, 3e) of the cooling circuit (2a, 2b) of the headlight unit (1).

8. Managing system (10) according to the preceding claim, characterized in that it includes at least one device for generating (4) an air flow, particularly a centrifugal fan, at least one temperature sensor (15), at least one temperature sensor (19) and / or at least one humidity sensor (14) measuring the temperature and the humidity level, respectively, that are present in the outer environment of the headlight unit (1) and / or at least one temperature sensor (13) included in an enclosure (11) of the headlight unit (1).

9. Managing system (10) according to any one of Claims 7 and 8, characterized in that it includes at least one temperature sensor (15) arranged in a lighting module (12a, 12b) of said headlight unit (1).

10. Vehicle, particularly a motor vehicle, characterized in that it includes at least one headlight unit (1) according to any one of Claims 1 to 3.

11. Computer program including program code instructions for executing the steps of the method according to any one of Claims 4 to 6 when said program is executed by a control unit (18) of a managing system (10) according to any one of Claims 7 to 9.

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