FR3056499A1 - DEVICE FOR INDICATING THE AIR QUALITY OF A MOTOR VEHICLE HABITACLE - Google Patents

Abstract

A device for indicating the quality of the air (2) of a passenger compartment (4) of a motor vehicle comprises at least one light device (6) configured to signal a state of pollution of the air. An object of the invention further relates to a method for transmitting a luminous indicator signal, during which a step of measuring a value representative of the quality of the air is carried out, a step of comparison by a control device of the measured value with at least one predetermined threshold value, a step of calculating a control command of at least one luminous device, the control command depending on the state of the comparison carried out previously, and a step of projecting at least one light beam by the light device according to the control instruction.

Description

(57) A device for indicating the air quality (2) of a passenger compartment (4) of a motor vehicle comprises at least one light device (6) configured to signal an air pollution state.

An object of the invention further relates to a method for transmitting a light indicator signal, during which a step of measuring a value representative of the air quality is carried out, a step of comparison by a device for controlling the value read with at least one predetermined threshold value, a step of calculating a control instruction for at least one light device, the control instruction depending on the state of the comparison carried out previously, and a step of projecting at least one light beam by the light device according to the control instruction.

DEVICE FOR INDICATING THE AIR QUALITY OF A MOTOR VEHICLE INTERIOR

The present invention relates to the field of light devices, and more particularly to the field of light devices for the interior lighting of motor vehicles.

It is known to equip motor vehicles with air treatment devices in the passenger compartment, capable of providing comfort to passengers and the driver, for example to regulate the air temperature, in order to provide heating or cooling operations depending on the outside temperature. Automobile manufacturers and equipment manufacturers have also become aware of the new needs and concerns of users, in particular concerning the environment, and more particularly, the quality of the air surrounding the user. Certain vehicles can thus embark on devices for purifying the air present in the passenger compartment, or at least the air brought into the passenger compartment by the heating and / or air conditioning devices. Each of these devices can be controlled by the user by means of control buttons and means can be used to give information to the passengers of the vehicle on the proper functioning of these different devices.

The triggering of these air purification devices is carried out by the user, according to a feeling of stale air, which can generate a late triggering, or according to a feeling that the air of the passenger compartment will become impure, which can generate an advance triggering too early and premature wear of the air purification device and for example of its filter if necessary.

In this context, the invention aims to propose a device for indicating the air quality of a passenger compartment of a motor vehicle, of simple and intuitive design and use, intended to inform the user, in particular the driver. and / or the passengers on the state of the pollution of the surrounding air, in particular inside the cabin of the vehicle.

To this end, a first aspect of the invention relates to a device for indicating the air quality of a passenger compartment of a motor vehicle comprising a light device configured to signal a state of the air quality.

More particularly, the indication device according to the invention may include a light device configured to emit a light beam, the configuration of which changes as a function of a change in the quality of the air in the passenger compartment.

Such a device makes it possible to quickly and visually inform the user by a light, intuitive and aesthetic signal, both to prevent him from degrading the quality of the ambient air, and to reassure him about the good quality. of the air he breathes. This avoids improper triggering of air purification devices, and users can adapt their attitude during the journey to this information. The visual information makes it possible to have a continuous indication function which evolves over time as a function of changes in air quality values, and which therefore makes it possible to signal a risk but also to assure the driver that the level of ambient air quality is correct. As such, an audible signal could not bring the same advantages since it could only be emitted at the crossing of a critical threshold, under penalty of hindering the driving of the vehicle, where the light device can emit a light beam of extended over time.

According to different characteristics, taken alone or in combination, of the device of the invention, provision may be made for:

the device comprises at least one device for measuring the air quality, and one control device, the measuring device being configured to measure a value representative of the quality of the air in the passenger compartment of the vehicle and for transmitting it to the control device which is configured to prepare an instruction for controlling the light device as a function of the measured value;

- the control instruction prepared by the control device determines the shape and / or the color and / or the intensity of a light beam emitted by the light device;

- The measuring device comprises at least one sensor arranged inside and / or outside the passenger compartment of the motor vehicle; alternatively, the measurement device may receive, via wireless communication means, information from information networks outside the vehicle and giving air pollution values in the urban area;

the control device comprises an analysis module configured to compare the value measured by the air quality measurement device with at least a predetermined threshold value, as well as a processing module which determines at least two instructions control for the emission of two distinct light beams according to the results of the comparison made by the analysis module;

- the threshold value is predetermined automatically and / or manually by the user;

- the at least one light device comprises at least one light source, and an optical element for projecting and / or shaping the rays emitted by the light source to generate a light beam of color, shape and specific light intensity determined air quality;

- The light device comprises at least one light-emitting diode;

- the control instruction prepared by the control device controls the operation of the at least one light source and / or of the optical projection element;

- The at least one light device is configured to emit one or more light beams in an information support zone, in particular a vehicle dashboard or a dome for lighting the passenger compartment arranged at the level of the vehicle roof;

- the optical element for projecting and / or shaping the rays is arranged in the information support zone;

- The optical element for projecting and / or shaping the rays is arranged at a distance from the information support zone, the light beams being projected onto said zone;

- The light device is configured to emit a light beam at a predetermined period, in particular between 3 and 5 seconds; this period corresponds to a normal respiratory rate of the human being.

The device according to the invention may further comprise at least one means for purifying the air inside the passenger compartment of the vehicle.

The means for purifying the indoor air can be configured to be activated automatically by the control device as a function of the comparison of the measured value with the predetermined threshold value.

The indoor air purification means can be configured to be activated manually by a user, by means of a physical control button, or by means of a software application executed on a mobile device such as a mobile phone, a smartphone or tablet or any other mobile means of communication.

In the case of a physical control button, provision may therefore be made for the light device to form a control button for the means for purifying the air inside the passenger compartment of the vehicle; the control button can in particular be configured in the form of a push button, which can be illuminated under the effect of the actuation of the light device, and actuable by pressure of a user.

The invention further relates to a method of transmitting a light indicator signal, during which a step of measuring a value representative of the air quality is carried out, a step of comparison by a device for controlling the the value read with at least a predetermined threshold value, a step of calculating an ordering instruction for at least one light device, the ordering instruction depending on the state of the comparison carried out previously, and a projection step at least one light beam by the light device according to the control instruction.

It is possible to emit according to the method of the invention a first light beam having a first appearance, in particular, a first shape and / or color and / or intensity, when the value detected is less than the predetermined threshold, and a second light beam having a second aspect distinct from the first aspect, in particular, a second shape and / or color and / or intensity when the value recorded is greater than or equal to the predetermined threshold.

During the calculation step, a control instruction is determined for the activation of a means for purifying the air inside the passenger compartment of the vehicle, according to the state of the comparison carried out previously. It is possible according to the invention to provide, in particular when the air quality is judged to be poor, the simultaneous or almost simultaneous sending of two control instructions defined as a function of the measurement taken, provided by the control device, from which a first control instruction which is transmitted to at least one light device and a second control instruction which is transmitted by means of air purification inside the passenger compartment of the vehicle.

Other characteristics, characteristics and advantages of the invention will appear more clearly on reading the description given below by way of indication in relation to the drawings in which:

FIG. 1 is a perspective illustration, seen from above, of a front passenger compartment, in particular a dashboard of a motor vehicle, equipped with a device for indicating the air quality according to a first embodiment. invention;

Figure 2 is a side view of a front passenger compartment, equipped with a device 5 for indicating the air quality according to a second embodiment of the invention;

FIG. 3 is a flow diagram of a first example of a method for indicating the air quality according to the invention; and Figure 4 is a flow diagram of a second example of an air quality indication method according to the invention.

According to the invention, there is in a passenger compartment 4 of a motor vehicle a device for indicating the quality of the air 2 present in the passenger compartment 4 and / or of the air brought into the passenger compartment 4.

In the example illustrated, the indication device 2 comprises a light device 6, 15 in particular arranged on a dashboard 8 of the vehicle, a device 10 for measuring the quality of the air present or entering the passenger compartment 4 , and a control device 12 configured to receive information relating to the air quality at a given instant and to generate in response light information to be transmitted to the users of the vehicle via the light device 6.

The light device 6 comprises at least one light source, for example of the light-emitting diode type, controlled by a control instruction received from a control device 12, and an optical element for projecting and / or shaping the rays emitted by the light source for generating a light beam 11 of color, shape and light intensity specific to an air quality value.

According to different variant embodiments, provision may be made for the light device 6 to operate in rear projection, that is to say that the light source is integrated in the element of the passenger compartment 4 on which the light indication is produced, or although it operates in frontal projection, that is to say that the light source and the associated optical element are housed in an element of the passenger compartment distinct from that on which the light beam 11 formed is projected. By way of nonlimiting example, it is intended that the light indication is made on the dashboard 8 of the vehicle, with one or more light sources integrated into the thickness of the dashboard 8 and an optical guide 13 arranged at the surface of the dashboard 8, so that it has an entry face through which the rays emitted by the light source or sources enter, and an exit face facing the passenger compartment 4, through which the rays, by means of optical deflection arranged in the optical guide 13, are capable of coming out.

Provision may be made for the light device 6 to be mounted at a distance from the information projection area, in this case the dashboard 8, in particular being mounted in the roof roof, above the front passengers of the vehicle, such as illustrated in FIG. 2. The light device 6 may take the form of a pi coprojector oriented towards the dashboard 8. It may also be possible to associate a reflector with a light source to deflect the light rays and form a beam light 11 directed towards the dashboard 8, such a reflector being able to be movable to orient the light beam 11 emitted on an area defined by the control device 12. Other types of optical devices can be provided and in particular lenses, or micro-lens arrays, or micro-mirror arrays, to facilitate the creation of pictograms.

The light-emitting diode (s) may comprise one or more diodes of the RGB (Red-Green-Blue) type making it possible, by piloting the control device 12, to generate a light beam 11 of the desired color, dependent on the air quality ambient, as will be explained below. Alternatively, the light-emitting diode (s) may include one or more diodes of different colors.

The air quality indication device 2 is thus intended to inform at least one user of the vehicle, such as the driver and / or passengers, of an air quality present or entering the passenger compartment 4 interior, in particular by emitting a particular light beam 11 as a function of the state of air quality.

Provision may in particular be made for the air quality indication device 2 to signal to the user an air quality inside the passenger compartment 4 of the vehicle, that is to say a state of purity of the air in which the user may be at a given instant, or else provide that the air quality indication device 2 can inform of the quality of the surrounding air outside the vehicle, this is that is to say an air capable of entering the passenger compartment 4, or an air entering the vehicle, that is to say an air entering the heating, air conditioning, and / or ventilation system of the vehicle.

According to each of these embodiments, the measuring device 10 is either placed outside the passenger compartment 4 of the vehicle, in contact with the surrounding outside air to measure the state of pollution of the outside air, either arranged in a pipe of the heating, air conditioning, and / or ventilation device, to measure the state of purity of the air entering the vehicle, or also disposed inside the passenger compartment 4 of the vehicle for measure the indoor air quality surrounding at least the driver and any passengers.

In each of these cases, the measuring device 10 may include a sensor sensitive to the main pollutants, which can in particular measure in the surrounding air fine particles, microparticles, ozone, nitrogen oxide, dioxide nitrogen, carbon monoxide, carbon dioxide, sulfur compounds, volatile allergenic or harmful organic compounds, pollens, etc.

The control device 12 is configured to give a control instruction to the light device 6 as a function of the value of the air quality noted. The control device 12 comprises at least one analysis module 14 for the measured value of the air quality and a processing module 16 for this analysis.

The analysis module 14 compares the value of the air quality measured by the measuring device 10 with a reference threshold value, considered as the ceiling value beyond which the air quality is poor, c that is, the air analyzed is "too polluted". If the measured value is less than or equal to the reference threshold value, the air quality is considered to be good, acceptable, while if the representative air quality value is greater than the reference threshold value, air quality is considered poor. In addition, intermediate thresholds representative of progressive degradation of air quality can be provided.

The processing module 16 is configured to model a control instruction following the comparison made by the analysis module 14. In this way, the control instruction determines specific characteristics of the light beam 11 to be produced by the light device 6 , and in particular a shape and / or a light intensity and / or a particular color (s) of the light beam as a function of the measured value of the air quality, and one or more characteristics of the light beam 11 emitted by the device luminous 6 may vary depending on the variation of the air quality measured. Examples of application of this light beam 11 will be detailed below and in particular how it is possible to play on the modifiable characteristics of the light beam to make the presentation of information on air quality intuitive, but it it should be noted at this stage that the characteristics of the light beam 11 must allow rapid recognition by the user: the light beam 11 must be perceptible, so that the wavelength of the rays emitted must be in the visible range, without being blinding, so that the light intensity of the light beam 11 emitted must be less than a limit value. Furthermore, the user should be able to easily distinguish two different aspects of the light beam 11 in order to easily note, without diverting his attention from the road scene for the driver, a change in the state of the air quality.

In the following description, a single predetermined threshold value Vs will be taken by way of non-limiting example, so that the air quality can be considered to be good, when the measured pollutant level is lower than this value threshold, or bad, when the measured pollutant level is higher than this threshold value. We can easily consider adding several intermediate threshold values showing the progressiveness of air quality. The threshold value can be automatically recorded in the control device 12 and / or it can either be chosen and saved manually in the control device 12 by a user.

According to a first implementation variant, the light device 6 is controlled by means of the control device 12 so as to modify the color of the light beam 11 emitted. When the air quality is good, that is to say when the rate of pollutants measured in the air is less than or equal to the predetermined threshold value Vs, a first light beam 11a, of a first color and for example green in color, is emitted and conversely, when the air quality is poor, that is to say when the rate of pollutants measured in the air is greater than the predetermined threshold value Vs, a second 1 lb light beam, of a second color and for example of red color, is emitted. The color of the emitted beam can change gradually depending on the level of pollutants measured in the air. The color of the light beam can thus change from red to orange, then to yellow to indicate a rate of pollutants respectively, very high, high, medium.

According to a second implementation variant, the light device 6 is controlled so as to modify the light intensity of the light beam 11 emitted. When the air quality is good, a first light beam 11a, of a first light intensity, is emitted, and conversely, when the air quality is poor, a second light beam 11b, of a second light intensity and in particular a light intensity stronger than the first light intensity, is emitted.

According to a third implementation variant, the light device 6 is controlled so as to flash at a frequency depending on the level of pollutant measured, for example the faster the rate is high.

These three variants of implementation can be achieved regardless of the variant of the light device 6, whether it works in rear projection or in front projection as previously described.

According to a fourth implementation variant, the light device 6 can be controlled so as to modify the shape of the light beam 11 emitted, and this is particularly applicable when the light device 6 is installed in a structural element distinct from the element structure on which the light beam 11, and the information it gives, is projected. When the air quality is good, a first light beam 1 has a first shape, for example a diffuse task of large diameter, and conversely, when the air quality is poor, a second light beam 11b has a second form, distinct from the first form, and for example a more concentrated task, targeted at a specific area. An advantage of this variant of implementation will be described below.

Each of these implementation variants, and other variants imaginable without departing from the context of the invention, can be applied with a visual signature recorded beforehand and which can be selected manually by the user. In other words, a user will be able to choose, as soon as these options are implemented in advance in the control device 12, between a static light signal, capable according to the invention of taking several shapes / colors / intensities to reflect a modification. of the air quality, and a dynamic light signal, also capable according to the invention of taking several forms / colors / intensities as a function of the air quality.

If the driver chooses to project static light signals, the first light beam 11a and the second light beam 11b will consist of fixed beams, stable over time until the device is switched off or until the air quality requiring a change in shape / color / intensity. If the user chooses to project dynamic light signals, the first light beam 11a and the second light beam 11b may consist of intermittent beams, imagining a respiratory movement of the air quality indication device 2: the device light 6 is thus configured to emit an intermittent light beam 11 with an interval of between 3 and 5 seconds for a determined period, in particular one minute.

In order to optimize the visibility of the signal emitted by the air quality indication device 2 by each of the potential users of the motor vehicle, provision may be made in the passenger compartment 4 for a plurality of controlled light devices 6 by the control device 12 and distributed in the passenger compartment 4 of the vehicle.

In the example illustrated in Figure 1, at least one light device 6 is housed on the dashboard 8 of the vehicle, ensuring good visibility to the driver and passengers, the latter. It could be provided in an alternative or complementary manner that at least one light device 6 is housed on a vehicle dashboard allowing the exclusive visibility of the air quality indication device 2 to the driver and / or to at least one light device 6 is placed in the ceiling light.

In addition to what has just been described above, the air quality indication device 2 can comprise at least one means for purifying the air 18 inside the passenger compartment 4 of the vehicle, such as 'an ionizer. This purification means 18 can be housed in the passenger compartment 4 of the vehicle, or arranged in a pipe of the heating, ventilation, and / or air conditioning device.

The purification means 18 may include a control button 20, so as to be activated manually by the driver and / or a passenger. The purification means 18 can also be configured to be able to be activated automatically by the control device 12, in particular when the value recorded by the measurement device 10 is representative of poor air quality.

In the case of a purification means 18 which can be activated manually, the control button 20 is projecting, or flush, with a structural element of the passenger compartment 4 such as the dashboard 8, or for example with a screen touch control.

In FIG. 1, a particular embodiment has been illustrated in that the light device 6 is arranged around the control button 20 and the purification means 18. Such an arrangement offers a central position to the light device 6, visible to all. users, and it makes it easy to identify the control button 20 in the center of the light device 6.

This arrangement allows, when the light device 6 is arranged at the roof pavilion or in any other structural element than that on which is projected, to project a first light beam 11 in the form of a diffuse task of large diameter, on a large part of the dashboard, when the air quality is good, and to project a second, more concentrated and targeted light beam 11 on the control button 20 as soon as it is detected that the air quality is poor . The user of the vehicle intuitively understands that it is then useful to press the control button 20. This air quality indication function thus makes it possible to identify the control button 20 on which press to manually activate an air purification function. This is all the more advantageous since the control button 20 is small, or even in the form of an unidentifiable tactile button on the dashboard 8 as long as the light beam 11 of the light device 6 does not target it precisely.

Alternatively, provision may be made for the light device 6 and the control button 20 to be combined. The light device 6 takes the form of a transparent press button allowing the generated light beam 11 to pass. The driver and / or passengers can manually activate the air purification means 18 by simply pressing the light device 6.

As has been described previously, the means for purifying the indoor air 18 can be activated by a user by means of a software application executed on a mobile device such as a mobile phone, a smartphone or a tablet or any other mobile means of communication. Advantageously, the software application also makes it possible to configure the air purification means 18.

FIGS. 3 and 4 illustrate flowcharts illustrating a first and a second example of a method for transmitting an air quality indication signal according to a second aspect of the invention, the second example differing of the first in that it applies when the air quality indication device 2 according to the first aspect of the invention comprises an air purification means 18 and in that it provides for its setting automatic operation according to the quality of the air measured, in parallel with the implementation of the light device (s) 6.

The emission process illustrated in FIG. 3 can be initiated from the start of the vehicle, and be implemented until the vehicle stops, or the users exit from the passenger compartment 4. It can also be implemented. works punctually, at the request of a user.

A first step 101 consists in evaluating the quality of the air in the passenger compartment and / or the quality of the air outside or entering the vehicle. The measuring means 10 is configured to detect a rate of pollutants in the air, and to send as an output, to the control device 12 and more particularly the analysis module 14, a measured value 110 of the quality of the air in a given area.

Via the analysis module 14, a second comparison step 102 determines, with reference to a predetermined threshold value Vs, which can be entered automatically or manually by a user, if the air quality is to be estimated as good or bad.

In this example application, where the comparison is made only with respect to a threshold value, two responses are possible at the end of this comparison step 102.

If the measured value 110 is less than the predetermined threshold value Vs, the analysis module 14 sends to the processing module 16 information 111 of non-exceeding of the threshold representative of good air quality. In a third calculation step 103, the processing module 16 generates a first control instruction 112 of the light device 6 in correspondence with this non-overshoot information item 111, so that the latter emits, in a fourth projection step 104, a first light beam 11a, in appearance defined by this first control instruction 112. The first light beam 1a may thus have one and / or the other of the following characteristics, in accordance with what has been described above and without this list is exhaustive: a green color to reassure users of good air quality, a low light intensity so as not to attract attention when there is no risk situation, a diffuse form on everything or part of the dashboard, thereby generating interior mood lighting and / or a controlled emission frequency, to illustrate breathing ease, with for example an intermittence of four seconds.

If the measured value 110 is equal to or greater than the predetermined threshold value Vs, the analysis module 14 sends to the processing module 16 information 113 of exceeding the threshold representative of poor air quality. During the third calculation step 103, the processing module 16 then generates a second control instruction 114 of the light device 6 in correspondence with this information 113 of overshoot, so that the latter emits, in the fourth projection step 104, a second light beam 1 lb, in appearance defined by this second control instruction 112. The second light beam 11b may thus have one and / or the other of the following characteristics, in accordance with what has been described above and without that this list be exhaustive: a red color to warn users of poor air quality, and / or a strong light intensity, but still lower than a critical intensity value, to draw users' attention to the need for future action to avoid breathing polluted air without risk of dazzling the driver, and / or a form concentrated on part of the dashboard, particularly targeted at a control button 20 for triggering an air purifier, and / or a rapid emission frequency, to illustrate a breathing difficulty, with for example an intermittence of two seconds.

As mentioned above, the emission method illustrated in FIG. 4 differs from the method illustrated in FIG. 3 by the automatic activation of the purification means 18 when the quality of the air in the passenger compartment 4 is judged to be poor.

The method described above remains the same with regard to the first measurement step 101 and the comparison step 102, as well as the calculation steps 103 and projection steps 104 when the air quality is good. It differs when the measured value 110 is equal to or greater than the predetermined threshold value Vs and that the analysis module 14 sends to the processing module 16 information 113 of exceeding the threshold representative of poor air quality.

In this second example of the emission method according to the invention, the processing module 16 generates simultaneously, or substantially at the same time, a second control instruction 114 of the light device 6 so that the latter emits, in the fourth step of projection 104, a second light beam 11b, in appearance defined by this second control instruction 112, as well as a third control instruction 115 in the direction of the air purification means 18. The control instruction 115 may in particular comprise an operating time, with a restart of the process at the end of the operating time of the air purification means 18. A fifth step 105 of activation of the air purification means 18 is then carried out, before restarting a cycle of the process.

Provision may be made to control the light device 6 so that it indicates the air purification action in progress. To this end, the control device 12 can generate a specific control instruction so that the light device 6 emits a light beam 11 whose color or light intensity, for example, changes during the operating time to finally take on a color or an intensity close to that of the first light beam 11a when the air quality is good. By way of example, the control device 12 generates a second control instruction so that the projected light beam 11 is red and simultaneously a third control instruction to activate the air purification means 18 for two minutes. The control device 12 then generates a new second control instruction so that the projected light beam 11 changes in two minutes from a red color to a green color, passing for example through an orange color, then yellow, then green, all thirty seconds. The users are thus reassured about the proper functioning of the air purification means 18 and about the improvement of the air quality in the passenger compartment 4.

According to this example of a method, the means for purifying the indoor air 18 is activated by the control device 12 following the measurement of the value of the air quality when the latter is greater than the threshold value.

The foregoing description clearly explains how the invention makes it possible to achieve the objectives which it has set for itself and in particular to propose a light device 6 informing of the quality of the surrounding air. In any event, the invention cannot be limited to the embodiment specifically described in this document, and extends in particular to all equivalent means and to any technically effective combination of these means.

Claims (15)

1. Device for indicating the air quality (2) of a passenger compartment (4) of a motor vehicle, characterized in that it comprises at least one light device (6) configured to signal, in particular to the inside said passenger compartment, a state of air pollution. 2. Device according to claim 1, characterized in that it comprises at least one device for measuring (10) the air quality, and a control device (12), the measuring device being configured to measure a value (lio) representative of the air quality of the passenger compartment of the vehicle and for transmitting it to the control device (12) which is configured to prepare a control instruction (112, 113) for the light device (6) in function of the measured value (110). 3 · Device according to the preceding claim, characterized in that the control instruction (112, 113) prepared by the control device (12) determines the shape and / or the color and / or the intensity of a light beam (lia, llb) emitted by the light device (6). 4 · Device according to any one of claims 2 or 3, characterized in that the measuring device (lO) comprises at least one sensor disposed inside and / or outside the passenger compartment (4) of the motor vehicle. 5 · Device according to any one of claims 2 to 4, characterized in that the control device (12) comprises an analysis module (14) configured to compare the value (lio) measured by the measuring device (lO ) of the air quality to at least a predetermined threshold value (Vs), as well as a processing module (16) which determines at least two control instructions for the emission of two light beams (lia, llb) distinct according to the results of the comparison made by the analysis module (14). 6. Device according to any one of the preceding claims, characterized in that the at least one light device (6) comprises at least one light source, and an optical element for projecting and / or shaping the rays emitted by the light source for generating a light beam (lia, llb) of color, shape and light intensity specific to the determined air quality. 7. Device according to the preceding claim, in combination with claim 2, characterized in that the control instruction (112, 113) prepared by the control device (12) controls the operation of the at least one light source and / or the projection optical element. 8. Device according to any one of the preceding claims, characterized in that the at least one light device (6) is configured to emit one or more light beams (lia, llb) in an information support area, in particular a vehicle dashboard (8). 9. Device according to claim 8, in combination with claim 6, characterized in that the optical element for projecting and / or shaping the rays (13) is arranged in the information support area. 10. Device according to claim 8, in combination with claim 6, characterized in that the optical element for projecting and / or shaping the rays (13) is arranged at a distance from the information support zone, the light beams (11a, 11b) being projected onto said area. 11. Device according to any one of the preceding claims, characterized in that it comprises at least one means for purifying (18) the air inside the passenger compartment (4) of the vehicle. 12. Device according to the preceding claim, characterized in that the means for purifying (18) the indoor air is configured to be activated automatically by The control device (12) as a function of the comparison of the measured value (110) with respect to the predetermined threshold value (Vs). 13. Device according to any one of claims 11 or 12, characterized in that the light device (6) forms a control button (20) of the means for purifying (18) the interior air of the passenger compartment (4 ) of the vehicle. 5 14. Method for emitting a light indicator signal, during which: a) A measurement step (lOl) of a value representative of air quality, b) a step of comparison (102) by a control device (12) of the value measured with at least one predetermined threshold value, c) A step of calculating (103) a control instruction (112, 114) of at least one 10 light device (6), the control instruction depending on the state of the comparison carried out previously, d) A projection step (104) of at least one light beam (11a, 11b) by the light device (6) according to the control instruction (112, 114). 15 15 · Method of emission according to the preceding claim, implementing a device for indicating the air quality (2) according to one of claims 11 to 13. during which during the calculation step (103), a control instruction for the activation of the means for purifying (18) the interior air of the passenger compartment (4) of the vehicle is determined, according to the state of the comparison carried out previously. 1/3 Fiqure 2 2/3