WO2018115620A1 - Device for detecting particulate matter in an airflow for a motor vehicle - Google Patents

Device for detecting particulate matter in an airflow for a motor vehicle Download PDF

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Publication number
WO2018115620A1
WO2018115620A1 PCT/FR2017/053384 FR2017053384W WO2018115620A1 WO 2018115620 A1 WO2018115620 A1 WO 2018115620A1 FR 2017053384 W FR2017053384 W FR 2017053384W WO 2018115620 A1 WO2018115620 A1 WO 2018115620A1
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WO
WIPO (PCT)
Prior art keywords
orifice
channel
detection device
circulation channel
air
Prior art date
Application number
PCT/FR2017/053384
Other languages
French (fr)
Inventor
Amanda Martinell
Frédéric Ladrech
Original Assignee
Valeo Systemes Thermiques
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes Thermiques filed Critical Valeo Systemes Thermiques
Publication of WO2018115620A1 publication Critical patent/WO2018115620A1/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47Scattering, i.e. diffuse reflection
    • G01N21/49Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00735Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
    • B60H1/00792Arrangement of detectors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00735Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
    • B60H1/008Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models the input being air quality

Definitions

  • the invention relates to a device for detecting particulate matter in an air flow for a motor vehicle.
  • particulate matter any particle of sufficiently small size to be transported by air and to be inhaled.
  • Such a detection device makes it possible to inform then act automatically or manually on an air quality system of the motor vehicle in order to depollute the air intended to supply the passenger compartment of the motor vehicle.
  • This system is either integrated with a heating, ventilation and / or air conditioning system of the motor vehicle, or a module specially dedicated to original equipment or retrofit.
  • the system generally comprises an air purifier, such as a filter and / or an ionizer, to clean the flow of air that passes through it before entering the passenger compartment. vehicle.
  • an air purifier such as a filter and / or an ionizer
  • the air quality system is therefore essential for the health of motor vehicle users.
  • the particulate matter sensing device detects an amount of particulate matter in the airflow to the passenger compartment greater than a threshold value, it is possible for the air quality system to trigger the air purifier. 'air.
  • the detection device comprises an optical means for the detection of the particulate matter in said air flow which is disposed in contact with the air flow, which irreparably causes gradual clogging of the optical means by the particles contained in the air flow.
  • the subject of the invention is a device for detecting particulate matter in an air flow for a motor vehicle, comprising an optical means for detecting particulate matter in said air flow, said optical means comprising a light source capable of emitting light waves, a reception element able to receive light waves, the device comprising a zone called analysis zone and configured so that said airflow circulates therein, the light source being arranged so that emitting light waves into the analysis zone and the receiving element being arranged to receive light waves from the analysis zone, the device comprising a protection member of the optical means arranged to prevent particles of the particulate matter to be deposited on said optical means.
  • the device according to the present invention allows a separation of the charged air flow particles on the one hand and optical elements on the other hand, which ensures that the particles can not be deposited on the optical means.
  • the protection member comprises a circulation channel for the flow of air in the analysis zone.
  • the circulation channel comprises an orifice for the passage of light waves coming from the light source, called the first orifice, and / or a passage for the passage of light waves coming from the analysis zone, said second orifice.
  • the protection member comprises a channel, said first channel, of additional protection, one end of which is formed by the first orifice and / or another channel, said second channel, of additional protection, one of which end is formed by the second orifice.
  • the first protection channel extends angularly relative to a main direction of the circulation channel, and / or the second protection channel extends angularly relative to a main direction of the circulation channel.
  • the circulation channel has a variable section along its length. According to another characteristic of the invention, a section of the circulation channel upstream of the first orifice and / or the second orifice relative to a direction of flow of the air flow is less than a section of the circulation channel downstream of the first and / or second orifice.
  • the circulation channel is provided with a section restriction means upstream of the first orifice and / or the second orifice relative to a direction of flow of the air flow.
  • the protection member is treated anti-statically.
  • the device comprises means for depressing the analysis zone.
  • the invention also relates to an air quality system for a motor vehicle, comprising a particulate matter detection device according to one of the preceding claims, and a means for purifying an air flow to a passenger compartment of the motor vehicle.
  • the invention also relates to a heating, ventilation and / or air conditioning device for a motor vehicle, comprising an air quality system according to the preceding claim.
  • FIG. 1 illustrates a schematic longitudinal sectional view of a particulate matter detection device according to the present invention
  • FIG. 2 illustrates positions of a source and a receiver of the device of FIG. 1;
  • FIG. 3 illustrates the device of FIG. 1 according to a first variant embodiment
  • FIG. 4 illustrates the device of FIG. 1 according to a second variant embodiment
  • FIG. 5 illustrates the device of FIG. 1 according to a third variant embodiment
  • FIG. 6 illustrates a diagrammatic view in longitudinal section of a device for detecting particulate matter according to a second embodiment of the present invention.
  • FIG. 7 illustrates a schematic view in longitudinal section of a particulate matter detection device according to a third embodiment of the present invention.
  • the invention relates to a device for detecting particulate matter in an air flow for a motor vehicle, referenced 1 in the figures.
  • particulate matter any particle of sufficiently small size to be transported by air and be inhaled.
  • the particles can be solid, liquid, or a mixture of solids and liquids.
  • the particle diameter is between 0.005 ⁇ and 100 ⁇ .
  • the particulate matter comprises a mixture of spores, pollen, cigarette smoke, carbon ...
  • the detection device 1 is particularly applicable to an air quality system of a motor vehicle, not shown.
  • the air quality system of the motor vehicle includes the detection device 1.
  • the air quality system makes it possible to depollute the air intended to supply the passenger compartment of the motor vehicle or the internal air in recycling mode.
  • This system is either integrated with a heating, ventilation and / or air conditioning of the motor vehicle, or a specially dedicated module.
  • the system also includes an air purifier, such as a filter and / or an ionizer, to clean the flow of air that passes through before entering the cabin of the vehicle.
  • an air purifier such as a filter and / or an ionizer
  • the particulate matter detection device detects a As the amount of particulate matter in the airflow to the passenger compartment exceeds a threshold value, it is possible that the air quality system will trigger the air purifier.
  • the air flow, F which is referred to, is intended to supply air to the passenger compartment of the motor vehicle.
  • the air flow can come from outside to measure the concentration of particulate matter outside, the heater, ventilation and / or air conditioning of the motor vehicle operating in recirculation mode.
  • the air flow F carries particles referenced P of the particulate matter.
  • the device 1 comprises an optical means 2 for the detection of the particulate matter in the air flow F.
  • the optical means 2 comprises a light source 3 capable of emitting light waves and a receiving element 4 able to receive light waves.
  • the receiving element is called a photoreceptor
  • the device 1 comprises a measuring chamber 5 provided with an inlet 6 for entering the flow of air F into the measuring chamber 5.
  • the measuring chamber 5 is also provided with an outlet 7 for the flow of air F out of the measuring chamber 5.
  • the measurement chamber 5 delimits a so-called analysis zone 8 in which the particles P, carried by the air flow F, circulate.
  • the light source 3 emits an incident light beam 10 in a main direction 1 1.
  • the light source 3 is for example a laser diode.
  • the light source 3 is arranged so as to emit light waves in the analysis zone 8.
  • the photoreceptor is arranged to receive light waves from the analysis zone 8.
  • the main direction 1 1 of the light beam 10 forms a non-zero angle and is preferably acute with respect to the flow direction of the air flow F.
  • the light beam 10 is reflected at least partially by the particles P of the air flow F into a reflected light beam 12.
  • the light beam 12 has a main direction 13, here symmetrical, symmetrical to the main direction 1 1 of the light beam 10 relative to the main direction of the air flow F.
  • the main direction 1 1 of the light beam makes a non-zero angle and preferably acute with the flow direction of the air flow F.
  • the photoreceptor 4 is arranged to receive the reflected light beam 12.
  • the photoreceptor 4 operates in a range of wavelength values coherent with the wavelength (s) of the reflected light beam 12, which possibly coincides with a range of operating wavelengths of the light source 3 .
  • the light source and the photoreceptor 4 are positioned such that an angle ⁇ that they form between them is between 90 ° and 180 ° (180 ° being preferably excluded).
  • the optical means also comprises one or more elements for shaping and / or guiding the incident light beam 10 and the reflected light beam 12.
  • the shaping elements comprise a lens 15.
  • the invention is not limited to a lens and the optical means may comprise for example one or more collimating lenses, and / or one or more convergent and / or divergent lenses.
  • the device 1 comprises a protection member 20 of the optical means 2 arranged so as to prevent particles P of the particulate material from being deposited on the optical means 2.
  • the system comprises a unit, not shown, for quantifying the concentration of the detected particulate matter.
  • the protection member 20 comprises a circulation channel 21 of the air flow in the analysis zone.
  • the circulation channel 21 makes it possible to guide the flow of air F into the measuring chamber 5.
  • the circulation channel 21 also ensures the confinement of the particles P contained in the air flow F.
  • the circulation channel 21 comprises a passage orifice for the incident light beam 10, called the first orifice 22, and a passage orifice for the reflected light beam 12, said second orifice 23.
  • first port 22 and the second port 23 are arranged opposite one another.
  • the diameter of the first orifice 22 is chosen to be slightly wider than a section of the incident light beam 10.
  • the diameter of the second orifice 23 is chosen to be slightly wider than a section of the reflected light beam 12.
  • the circulation channel 21 is opaque, which makes it possible to reduce the level of luminous intensity received by the photoreceptor 4.
  • the circulation channel 21 has a variable section along its length.
  • This variation of section in the circulation channel 21 is preferably located at the first and second ports.
  • This variation of section makes it possible to protect the orifices of a deposit and / or an entry of the particles on the optical means 2.
  • This section variation also makes it possible to prevent air circulation around the photoreceptor 4.
  • a section of the circulation channel 21 upstream of the first orifice 22 and the second orifice 23 relative to the flow direction of the air flow F is less than a section of the circulation channel 21 downstream of the first and second ports 23.
  • the circulation channel 21 is formed in one piece. Nevertheless, it is conceivable that the circulation channel 21 is composed of two independent ducts, forming for example an annular orifice.
  • the circulation channel 21 is provided with a section restriction means 24 upstream of the first orifice 22 and the second orifice 23 relative to a flow direction of the air flow F.
  • the protection member 20 comprises a first additional protection channel 25 and a second additional protection channel 26.
  • the first additional channel 25 is defined between a free first end 27 disposed in the measuring chamber 5 and a second end 28 coinciding with the first orifice 22.
  • the first additional channel 25 extends in a main direction coinciding with the main direction of the incident light beam 10.
  • the first additional channel 25 has a section preferably slightly greater than a section of the incident light beam 10 so that all of the light waves emitted by the light source 3 enters the first additional channel 25.
  • the second additional channel 26 is delimited between a first free end 29 disposed in the measuring chamber and a second end 30. coinciding with the first orifice 22.
  • the second additional channel 26 extends in a main direction coinciding with the main direction of the reflected light beam 12.
  • the second additional channel 26 is arranged symmetrically with the first additional channel 25 relative to the main direction of the circulation channel 21.
  • the second additional channel 26 has a section preferably slightly greater than a section of the reflected light beam 12 so that all the light waves coming from the analysis zone 8 enter the first additional channel 25.
  • the circulation channel 21 is opaque, which makes it possible to reduce the level of luminous intensity received by the photoreceptor 4.
  • a connection between the channel 21 and the protective channels 25 and 26 comprises forms intended to prevent the entry of particles inside the protective channels (tulip, shelving, angle, wind-break, guide of air,).
  • the protection member 20 of the optical means comprises the circulation channel 21.
  • the circulation channel 21 has undergone anti-static treatment, for example such as that described in the application WO 2007071723.
  • the circulation channel 21 consists of polymethyl methacrylate with an anti-static coating of defined surface resistance, for example between 10 6 to 10 7 ohm.
  • the circulation channel 21 is advantageously optically transparent, which makes it possible not to provide it with a passage orifice for incident and reflected light beams.
  • the protection member 20 of the means optical 2 comprises a protection channel 31 of the transmission optics, that is to say the source 3 and the shaping means of the incident light beam 10 and a protection channel 32 of the reception optics .
  • the channels 31 and 32 ensure that the particles P of the particulate material are deposited neither on the source 3 and the photoreceptor 4 nor on the shaping means, such as the lenses 15.
  • the device 1 comprises a means, not illustrated, of depression of the analysis zone.
  • the measurement chamber 5 is depressed.
  • the depression means comprises for example a set of conduits maintained at different pressures, and / or a fan generating a pressure difference.
  • the device when the device is implanted in an air quality system, the device forms all or part of a secondary duct connected to a main duct of the air quality system.
  • a tapping of the air is provided in an overpressure zone of the main duct, upstream of the device, and a return of air is provided in a depression zone of the main air duct.
  • the upstream air intake is advantageously located before passing through a filter, in an overpressure zone of the inlet of the air heater, ventilation and / or air conditioning of the motor vehicle or in a water box.
  • the downstream air intake is advantageously located downstream of the filter and upstream of the fan wheel, in a depression zone.
  • an additional element such as a fan placed downstream of the sensor can "artificially” generate this pressure difference.
  • the device according to the present invention allows a separation of the charged air flow particles on the one hand and optical elements on the other hand, which ensures that the particles can not be deposited on the lenses or on the light source, nor on the photoreceptor.
  • the lifetime of the device is increased and maintenance on the device can be done on a low frequency, of the order of ten years or so.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
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Abstract

One subject of the invention is a device for detecting particulate matter in an airflow (F) for a motor vehicle, comprising an optical means (2) for detecting particulate matter in said airflow, said optical means (2) comprising a light source (3) that is able to emit light waves, and a receiving element (4) that is able to receive the light waves, the device (1) comprising what is called an analysis zone (8) that is configured so that said airflow (F) flows therethrough, the light source (3) being placed so as to emit light waves into the analysis zone (8) and the receiving element (4) being placed so as to receive light waves coming from the analysis zone (8), the device (1) comprising a member (20) for protecting the optical means (2), which is arranged so as to prevent particles (P) of the particulate matter from depositing on said optical means (2).

Description

DISPOSITIF DE DETECTION DE MATIERE PARTICULAIRE DANS UN FLUX D'AIR  DEVICE FOR DETECTING PARTICULATE MATTER IN AN AIR FLOW
POUR VEHICULE AUTOMOBILE  FOR MOTOR VEHICLE
L'invention concerne un dispositif de détection de matière particulaire dans un flux d'air pour un véhicule automobile. The invention relates to a device for detecting particulate matter in an air flow for a motor vehicle.
Par matière particulaire, on entend toutes particules de dimension suffisamment faible pour être transportées par l'air et être inhalées. By particulate matter is meant any particle of sufficiently small size to be transported by air and to be inhaled.
Un tel dispositif de détection permet d'informer puis d'agir de façon automatique ou manuelle sur un système de qualité d'air du véhicule automobile afin de dépolluer l'air destiné à alimenter l'habitacle du véhicule automobile. Such a detection device makes it possible to inform then act automatically or manually on an air quality system of the motor vehicle in order to depollute the air intended to supply the passenger compartment of the motor vehicle.
Ce système est soit intégré à un dispositif de chauffage, ventilation et/ou climatisation du véhicule automobile, soit à un module spécialement dédié en monte d'origine ou en deuxième monte. This system is either integrated with a heating, ventilation and / or air conditioning system of the motor vehicle, or a module specially dedicated to original equipment or retrofit.
Dans un cas comme dans l'autre, le système comprend généralement un purificateur d'air, tel qu'un filtre et/ou un ioniseur, permettant d'assainir le flux d'air qui le parcourt avant de pénétrer dans l'habitacle du véhicule. In either case, the system generally comprises an air purifier, such as a filter and / or an ionizer, to clean the flow of air that passes through it before entering the passenger compartment. vehicle.
Le système de qualité d'air s'avère donc primordial pour la santé des utilisateurs du véhicule automobile. The air quality system is therefore essential for the health of motor vehicle users.
Par exemple, si le dispositif de détection de matière particulaire détecte une quantité de matière particulaire dans le flux d'air à destination de l'habitacle supérieure à une valeur seuil, il est possible que le système de qualité d'air déclenche le purificateur d'air. For example, if the particulate matter sensing device detects an amount of particulate matter in the airflow to the passenger compartment greater than a threshold value, it is possible for the air quality system to trigger the air purifier. 'air.
Généralement, le dispositif de détection comprend un moyen optique pour la détection de la matière particulaire dans ledit flux d'air qui est disposé au contact du flux d'air, ce qui provoque irrémédiablement un encrassement progressif du moyen optique par les particules contenues dans le flux d'air. Generally, the detection device comprises an optical means for the detection of the particulate matter in said air flow which is disposed in contact with the air flow, which irreparably causes gradual clogging of the optical means by the particles contained in the air flow.
Le but de l'invention est de remédier au moins partiellement à ces inconvénients. A cet effet, l'invention a pour objet un dispositif de détection de matière particulaire dans un flux d'air pour un véhicule automobile, comprenant un moyen optique pour la détection de la matière particulaire dans ledit flux d'air, ledit moyen optique comprenant une source lumineuse apte à émettre des ondes lumineuses, un élément de réception apte à recevoir des ondes lumineuses, le dispositif comprenant une zone dite zone d'analyse et configurée pour que ledit flux d'air y circule, la source lumineuse étant disposée de sorte à émettre des ondes lumineuses dans la zone d'analyse et l'élément de réception étant disposé de sorte à recevoir des ondes lumineuses provenant de la zone d'analyse, le dispositif comprenant un organe de protection du moyen optique agencé de sorte à empêcher des particules de la matière particulaire de se déposer sur ledit moyen optique. The object of the invention is to at least partially overcome these disadvantages. To this end, the subject of the invention is a device for detecting particulate matter in an air flow for a motor vehicle, comprising an optical means for detecting particulate matter in said air flow, said optical means comprising a light source capable of emitting light waves, a reception element able to receive light waves, the device comprising a zone called analysis zone and configured so that said airflow circulates therein, the light source being arranged so that emitting light waves into the analysis zone and the receiving element being arranged to receive light waves from the analysis zone, the device comprising a protection member of the optical means arranged to prevent particles of the particulate matter to be deposited on said optical means.
Ainsi, le dispositif selon la présente invention permet une séparation du flux d'air chargé en particules d'une part et des éléments optiques d'autre part, ce qui assure que les particules ne puissent pas se déposer sur le moyen optique. Thus, the device according to the present invention allows a separation of the charged air flow particles on the one hand and optical elements on the other hand, which ensures that the particles can not be deposited on the optical means.
Selon une autre caractéristique de l'invention, l'organe de protection comprend un canal de circulation du flux d'air dans la zone d'analyse. According to another characteristic of the invention, the protection member comprises a circulation channel for the flow of air in the analysis zone.
Selon une autre caractéristique de l'invention, le canal de circulation comprend un orifice de passage des ondes lumineuses issues de la source lumineuse, dit premier orifice, et/ou un orifice de passage des ondes lumineuses provenant de la zone d'analyse, dit deuxième orifice. According to another characteristic of the invention, the circulation channel comprises an orifice for the passage of light waves coming from the light source, called the first orifice, and / or a passage for the passage of light waves coming from the analysis zone, said second orifice.
Selon une autre caractéristique de l'invention, l'organe de protection comprend un canal, dit premier canal, de protection supplémentaire dont une extrémité est formée par le premier orifice et/ou un autre canal, dit deuxième canal, de protection supplémentaire dont une extrémité est formée par le deuxième orifice. According to another characteristic of the invention, the protection member comprises a channel, said first channel, of additional protection, one end of which is formed by the first orifice and / or another channel, said second channel, of additional protection, one of which end is formed by the second orifice.
Selon une autre caractéristique de l'invention, le premier canal de protection s'étend angulairement relativement à une direction principale du canal de circulation, et/ou le deuxième canal de protection s'étend angulairement relativement à une direction principale du canal de circulation. According to another characteristic of the invention, the first protection channel extends angularly relative to a main direction of the circulation channel, and / or the second protection channel extends angularly relative to a main direction of the circulation channel.
Selon une autre caractéristique de l'invention, le canal de circulation présente une section variable sur sa longueur. Selon une autre caractéristique de l'invention, une section du canal de circulation en amont du premier orifice et/ou du deuxième orifice relativement à une direction d'écoulement du flux d'air est inférieure à une section du canal de circulation en aval du premier et/ou du deuxième orifice. According to another characteristic of the invention, the circulation channel has a variable section along its length. According to another characteristic of the invention, a section of the circulation channel upstream of the first orifice and / or the second orifice relative to a direction of flow of the air flow is less than a section of the circulation channel downstream of the first and / or second orifice.
Selon une autre caractéristique de l'invention, le canal de circulation est muni d'un moyen de restriction de section en amont du premier orifice et/ou du deuxième orifice relativement à une direction d'écoulement du flux d'air. According to another characteristic of the invention, the circulation channel is provided with a section restriction means upstream of the first orifice and / or the second orifice relative to a direction of flow of the air flow.
Selon une autre caractéristique de l'invention, l'organe de protection est traité anti- statiquement. According to another characteristic of the invention, the protection member is treated anti-statically.
Selon une autre caractéristique de l'invention, le dispositif comprend un moyen de mise en dépression de la zone d'analyse. According to another characteristic of the invention, the device comprises means for depressing the analysis zone.
L'invention a également pour objet un système de qualité d'air pour véhicule automobile, comprenant un dispositif de détection de matière particulaire selon l'une des revendications précédentes, et un moyen de purification d'un flux d'air à destination d'un habitacle du véhicule automobile. The invention also relates to an air quality system for a motor vehicle, comprising a particulate matter detection device according to one of the preceding claims, and a means for purifying an air flow to a passenger compartment of the motor vehicle.
L'invention a également pour objet un dispositif de chauffage, ventilation et/ou climatisation pour véhicule automobile, comprenant un système de qualité d'air selon la revendication précédente. The invention also relates to a heating, ventilation and / or air conditioning device for a motor vehicle, comprising an air quality system according to the preceding claim.
D'autres caractéristiques et avantages de l'invention apparaîtront encore à la lecture de la description qui va suivre. Celle-ci est purement illustrative et doit être lue en regard des dessins annexés sur lesquels : Other features and advantages of the invention will become apparent on reading the description which follows. This is purely illustrative and should be read in conjunction with the attached drawings in which:
- la figure 1 illustre une vue schématique en coupe longitudinale d'un dispositif de détection de matière particulaire selon la présente invention ; - Figure 1 illustrates a schematic longitudinal sectional view of a particulate matter detection device according to the present invention;
- la figure 2 illustre des positions d'une source et d'un récepteur du dispositif de la figure 1 ; FIG. 2 illustrates positions of a source and a receiver of the device of FIG. 1;
- la figure 3 illustre le dispositif de la figure 1 selon une première variante de réalisation ; FIG. 3 illustrates the device of FIG. 1 according to a first variant embodiment;
- la figure 4 illustre le dispositif de la figure 1 selon une deuxième variante de réalisation ; - la figure 5 illustre le dispositif de la figure 1 selon une troisième variante de réalisation ; FIG. 4 illustrates the device of FIG. 1 according to a second variant embodiment; FIG. 5 illustrates the device of FIG. 1 according to a third variant embodiment;
- la figure 6 illustre une vue schématique en coupe longitudinale d'un dispositif de détection de matière particulaire selon un deuxième mode de réalisation de la présente invention ; et FIG. 6 illustrates a diagrammatic view in longitudinal section of a device for detecting particulate matter according to a second embodiment of the present invention; and
- la figure 7 illustre une vue schématique en coupe longitudinale d'un dispositif de détection de matière particulaire selon un troisième mode de réalisation de la présente invention. FIG. 7 illustrates a schematic view in longitudinal section of a particulate matter detection device according to a third embodiment of the present invention.
L'invention a pour objet un dispositif de détection de matière particulaire dans un flux d'air pour un véhicule automobile, référencé 1 dans les figures. The invention relates to a device for detecting particulate matter in an air flow for a motor vehicle, referenced 1 in the figures.
Par matière particulaire, on entend toute particule de dimension suffisamment faible pour être transportée par l'air et être inhalées. By particulate matter is meant any particle of sufficiently small size to be transported by air and be inhaled.
Les particules peuvent être solides, liquides, ou un mélange de solides et liquides. The particles can be solid, liquid, or a mixture of solids and liquids.
Par exemple, le diamètre des particules est compris entre 0,005 μιη et 100 μιη. For example, the particle diameter is between 0.005 μιη and 100 μιη.
Par exemple, la matière particulaire comprend un mélange de spores, de pollen, de fumée de cigarettes, de carbone ... For example, the particulate matter comprises a mixture of spores, pollen, cigarette smoke, carbon ...
Le dispositif de détection 1 s'applique tout particulièrement à un système de qualité d'air d'un véhicule automobile, non illustré. The detection device 1 is particularly applicable to an air quality system of a motor vehicle, not shown.
Le système de qualité d'air du véhicule automobile comprend le dispositif de détection 1 . The air quality system of the motor vehicle includes the detection device 1.
Le système de qualité d'air permet de dépolluer l'air destiné à alimenter l'habitacle du véhicule automobile ou l'air interne en mode recyclage. The air quality system makes it possible to depollute the air intended to supply the passenger compartment of the motor vehicle or the internal air in recycling mode.
Ce système est soit intégré à un dispositif de chauffage, ventilation et/ou climatisation du véhicule automobile, soit un module spécialement dédié. This system is either integrated with a heating, ventilation and / or air conditioning of the motor vehicle, or a specially dedicated module.
Le système comprend également un purificateur d'air, tel qu'un filtre et/ou un ioniseur, permettant d'assainir le flux d'air qui le parcourt avant de pénétrer dans l'habitacle du véhicule. The system also includes an air purifier, such as a filter and / or an ionizer, to clean the flow of air that passes through before entering the cabin of the vehicle.
Par exemple, si le dispositif de détection de matière particulaire détecte une quantité de matière particulaire dans le flux d'air à destination de l'habitacle supérieure à une valeur seuil, il est possible que le système de qualité d'air déclenche le purificateur d'air. For example, if the particulate matter detection device detects a As the amount of particulate matter in the airflow to the passenger compartment exceeds a threshold value, it is possible that the air quality system will trigger the air purifier.
Dans la description qui va suivre, le flux d'air, F, auquel il est fait référence, est destiné à alimenter en air l'habitacle du véhicule automobile. In the following description, the air flow, F, which is referred to, is intended to supply air to the passenger compartment of the motor vehicle.
En variante, le flux d'air peut venir de l'extérieur pour mesurer la concentration en matière particulaire à l'extérieur, le dispositif de chauffage, ventilation et/ou climatisation du véhicule automobile fonctionnant en mode de recirculation. Alternatively, the air flow can come from outside to measure the concentration of particulate matter outside, the heater, ventilation and / or air conditioning of the motor vehicle operating in recirculation mode.
Le flux d'air F transporte des particules référencées P de la matière particulaire. The air flow F carries particles referenced P of the particulate matter.
Le dispositif 1 comprend un moyen optique 2 pour la détection de la matière particulaire dans le flux d'air F. The device 1 comprises an optical means 2 for the detection of the particulate matter in the air flow F.
Comme visible sur les figures, le moyen optique 2 comprenant une source lumineuse 3 apte à émettre des ondes lumineuses et un élément de réception 4 apte à recevoir des ondes lumineuses. As visible in the figures, the optical means 2 comprises a light source 3 capable of emitting light waves and a receiving element 4 able to receive light waves.
Dans la suite de la description, l'élément de réception est appelé photorécepteurIn the rest of the description, the receiving element is called a photoreceptor
4. 4.
Le dispositif 1 comprend une chambre de mesure 5 munie d'un orifice 6 d'entrée du flux d'air F dans la chambre de mesure 5. The device 1 comprises a measuring chamber 5 provided with an inlet 6 for entering the flow of air F into the measuring chamber 5.
La chambre de mesure 5 est également munie d'un orifice 7 de sortie du flux d'air F hors de la chambre de mesure 5. The measuring chamber 5 is also provided with an outlet 7 for the flow of air F out of the measuring chamber 5.
La chambre de mesure 5 délimite une zone dite d'analyse 8 dans laquelle les particules P, portées par le flux d'air F, circulent. The measurement chamber 5 delimits a so-called analysis zone 8 in which the particles P, carried by the air flow F, circulate.
Comme visible sur les figures, la source lumineuse 3 émet un faisceau lumineux incident 10 dans une direction principale 1 1 . As shown in the figures, the light source 3 emits an incident light beam 10 in a main direction 1 1.
La source lumineuse 3 est par exemple une diode laser. The light source 3 is for example a laser diode.
Comme visible sur les figures, la source lumineuse 3 est disposée de sorte à émettre des ondes lumineuses dans la zone d'analyse 8. As shown in the figures, the light source 3 is arranged so as to emit light waves in the analysis zone 8.
Comme visible sur les figures, le photorécepteur est disposé de sorte à recevoir des ondes lumineuses provenant de la zone d'analyse 8. As shown in the figures, the photoreceptor is arranged to receive light waves from the analysis zone 8.
Sur les modes de réalisation illustrés, la direction principale 1 1 du faisceau lumineux 10 fait un angle non nul et de préférence aigu avec la direction d'écoulement du flux d'air F. In the illustrated embodiments, the main direction 1 1 of the light beam 10 forms a non-zero angle and is preferably acute with respect to the flow direction of the air flow F.
Le faisceau lumineux 10 est réfléchi au moins partiellement par les particules P du flux d'air F en un faisceau lumineux réfléchi 12. The light beam 10 is reflected at least partially by the particles P of the air flow F into a reflected light beam 12.
Le faisceau lumineux 12 présente une direction principale 13, ici symétrique, symétrique de la direction principale 1 1 du faisceau lumineux 10 relativement à la direction principale du flux d'air F. The light beam 12 has a main direction 13, here symmetrical, symmetrical to the main direction 1 1 of the light beam 10 relative to the main direction of the air flow F.
Sur les modes de réalisation illustrés, la direction principale 1 1 du faisceau lumineux fait un angle non nul et de préférence aigu avec la direction d'écoulement du flux d'air F. In the illustrated embodiments, the main direction 1 1 of the light beam makes a non-zero angle and preferably acute with the flow direction of the air flow F.
Le photorécepteur 4 est disposé de sorte à recevoir le faisceau lumineux réfléchi 12. The photoreceptor 4 is arranged to receive the reflected light beam 12.
On note que le photorécepteur 4 fonctionne dans une plage de valeurs de longueurs d'onde cohérente avec la ou les longueurs d'ondes du faisceau lumineux réfléchi 12, qui éventuellement coïncide avec une plage de longueurs d'onde de fonctionnement de la source lumineuse 3. Note that the photoreceptor 4 operates in a range of wavelength values coherent with the wavelength (s) of the reflected light beam 12, which possibly coincides with a range of operating wavelengths of the light source 3 .
Comme visible sur la figure 2, la source lumineuse et le photorécepteur 4 sont positionnés de telle sorte qu'un angle a qu'ils forment entre eux est compris entre 90° et 180° (180° étant de préférence exclue). As visible in FIG. 2, the light source and the photoreceptor 4 are positioned such that an angle α that they form between them is between 90 ° and 180 ° (180 ° being preferably excluded).
De préférence, le moyen optique comprend également un ou des éléments de mise en forme et/ou de guidage du faisceau lumineux incident 10 et du faisceau lumineux réfléchi 12. Preferably, the optical means also comprises one or more elements for shaping and / or guiding the incident light beam 10 and the reflected light beam 12.
Sur les modes de réalisation illustrés, les éléments de mise en forme comprennent une lentille 15. In the illustrated embodiments, the shaping elements comprise a lens 15.
Bien entendu, l'invention ne se limite pas à une lentille et le moyen optique peut comprendre par exemple une ou plusieurs lentilles de collimation, et/ou une ou plusieurs lentilles convergentes et/ou divergentes. Comme visible sur les figures, le dispositif 1 comprend un organe de protection 20 du moyen optique 2 agencé de sorte à empêcher des particules P de la matière particulaire de se déposer sur le moyen optique 2. Of course, the invention is not limited to a lens and the optical means may comprise for example one or more collimating lenses, and / or one or more convergent and / or divergent lenses. As shown in the figures, the device 1 comprises a protection member 20 of the optical means 2 arranged so as to prevent particles P of the particulate material from being deposited on the optical means 2.
Avantageusement, le système comprend une unité, non illustrée, de quantification de concentration de la matière particulaire détectée. Advantageously, the system comprises a unit, not shown, for quantifying the concentration of the detected particulate matter.
Organe de protection Body of protection
Premier mode de réalisation First embodiment
Selon le premier mode de réalisation, illustré aux figures 1 à 5, l'organe de protection 20 comprend un canal de circulation 21 du flux d'air dans la zone d'analyse. According to the first embodiment, illustrated in Figures 1 to 5, the protection member 20 comprises a circulation channel 21 of the air flow in the analysis zone.
Le canal de circulation 21 permet le guidage du flux d'air F dans la chambre de mesure 5. The circulation channel 21 makes it possible to guide the flow of air F into the measuring chamber 5.
Le canal de circulation 21 assure également le confinement des particules P contenues dans le flux d'air F. The circulation channel 21 also ensures the confinement of the particles P contained in the air flow F.
Sur le mode de réalisation illustré aux figures 1 à 5, le canal de circulation 21 comprend un orifice de passage du faisceau lumineux incident 10, dit premier orifice 22, et un orifice de passage du faisceau lumineux réfléchi 12, dit deuxième orifice 23. In the embodiment illustrated in FIGS. 1 to 5, the circulation channel 21 comprises a passage orifice for the incident light beam 10, called the first orifice 22, and a passage orifice for the reflected light beam 12, said second orifice 23.
Comme visible sur la figure 1 , le premier orifice 22 et le deuxième orifice 23 sont disposés en regard l'un de l'autre. As visible in Figure 1, the first port 22 and the second port 23 are arranged opposite one another.
Le diamètre du premier orifice 22 est choisi de sorte à être légèrement plus large qu'une section du faisceau lumineux incident 10. The diameter of the first orifice 22 is chosen to be slightly wider than a section of the incident light beam 10.
Le diamètre du deuxième orifice 23 est choisi de sorte à être légèrement plus large qu'une section du faisceau lumineux réfléchi 12. The diameter of the second orifice 23 is chosen to be slightly wider than a section of the reflected light beam 12.
Avantageusement, le canal de circulation 21 est opaque, ce qui permet de réduire le niveau d'intensité lumineuse reçue par le photorécepteur 4. Advantageously, the circulation channel 21 is opaque, which makes it possible to reduce the level of luminous intensity received by the photoreceptor 4.
Selon des variantes illustrées aux figures 3 et 4, le canal de circulation 21 présente une section variable sur sa longueur. According to variants illustrated in Figures 3 and 4, the circulation channel 21 has a variable section along its length.
Cette variation de section dans le canal de circulation 21 est de préférence située au niveau des premier et second orifices. This variation of section in the circulation channel 21 is preferably located at the first and second ports.
Cette variation de section permet de protéger les orifices d'un dépôt et/ou d'une entrée des particules sur le moyen optique 2. This variation of section makes it possible to protect the orifices of a deposit and / or an entry of the particles on the optical means 2.
Cette variation de section permet également d'éviter une circulation d'air autour du photorécepteur 4. This section variation also makes it possible to prevent air circulation around the photoreceptor 4.
Selon la variante illustrée à la figure 3, une section du canal de circulation 21 en amont du premier orifice 22 et du deuxième orifice 23 relativement à la direction d'écoulement du flux d'air F est inférieure à une section du canal de circulation 21 en aval du premier et du deuxième orifice 23. According to the variant illustrated in Figure 3, a section of the circulation channel 21 upstream of the first orifice 22 and the second orifice 23 relative to the flow direction of the air flow F is less than a section of the circulation channel 21 downstream of the first and second ports 23.
Selon la variante illustrée, le canal de circulation 21 est formé d'une seule pièce. Néanmoins, il est envisageable que le canal de circulation 21 soit composé de deux conduits indépendants, formant par exemple un orifice annulaire. According to the illustrated variant, the circulation channel 21 is formed in one piece. Nevertheless, it is conceivable that the circulation channel 21 is composed of two independent ducts, forming for example an annular orifice.
Selon la variante illustrée à la figure 4, le canal de circulation 21 est muni d'un moyen de restriction de section 24 en amont du premier orifice 22 et du deuxième orifice 23 relativement à une direction d'écoulement du flux d'air F. According to the variant illustrated in Figure 4, the circulation channel 21 is provided with a section restriction means 24 upstream of the first orifice 22 and the second orifice 23 relative to a flow direction of the air flow F.
Selon une troisième variante illustrée à la figure 5, l'organe de protection 20 comprend un premier canal de protection supplémentaire 25 et un deuxième canal de protection supplémentaire 26. According to a third variant illustrated in FIG. 5, the protection member 20 comprises a first additional protection channel 25 and a second additional protection channel 26.
Le premier canal supplémentaire 25 est délimité entre une première extrémité 27, libre, disposée dans la chambre de mesure 5 et une deuxième extrémité 28 coïncidant avec le premier orifice 22. The first additional channel 25 is defined between a free first end 27 disposed in the measuring chamber 5 and a second end 28 coinciding with the first orifice 22.
Le premier canal supplémentaire 25 s'étend selon une direction principale coïncidant avec la direction principale du faisceau lumineux incident 10. The first additional channel 25 extends in a main direction coinciding with the main direction of the incident light beam 10.
Le premier canal supplémentaire 25 présente une section de préférence légèrement supérieure à une section du faisceau lumineux incident 10 afin que la totalité des ondes lumineuses émises par la source lumineuse 3 pénètre dans le premier canal supplémentaire 25. The first additional channel 25 has a section preferably slightly greater than a section of the incident light beam 10 so that all of the light waves emitted by the light source 3 enters the first additional channel 25.
Le deuxième canal supplémentaire 26 est délimité entre une première extrémité 29, libre, disposée dans la chambre de mesure et une deuxième extrémité 30 coïncidant avec le premier orifice 22. The second additional channel 26 is delimited between a first free end 29 disposed in the measuring chamber and a second end 30. coinciding with the first orifice 22.
Le deuxième canal supplémentaire 26 s'étend selon une direction principale coïncidant avec la direction principale du faisceau lumineux réfléchi 12. The second additional channel 26 extends in a main direction coinciding with the main direction of the reflected light beam 12.
Le deuxième canal supplémentaire 26 est disposé symétriquement au premier canal supplémentaire 25 relativement à la direction principale du canal de circulation 21 . The second additional channel 26 is arranged symmetrically with the first additional channel 25 relative to the main direction of the circulation channel 21.
Le deuxième canal supplémentaire 26 présente une section de préférence légèrement supérieure à une section du faisceau lumineux réfléchi 12 afin que la totalité des ondes lumineuses provenant de la zone d'analyse 8 pénètre dans le premier canal supplémentaire 25. The second additional channel 26 has a section preferably slightly greater than a section of the reflected light beam 12 so that all the light waves coming from the analysis zone 8 enter the first additional channel 25.
Avantageusement, le canal de circulation 21 est opaque, ce qui permet de réduire le niveau d'intensité lumineuse reçue par le photorécepteur 4. Advantageously, the circulation channel 21 is opaque, which makes it possible to reduce the level of luminous intensity received by the photoreceptor 4.
De préférence, une liaison entre le canal 21 et les canaux de protection 25 et 26 comprend des formes destinées à éviter l'entrée de particules à l'intérieur des canaux de protection (tulipage, rayonnage, angle, saute-vent, guide d'air,...). Preferably, a connection between the channel 21 and the protective channels 25 and 26 comprises forms intended to prevent the entry of particles inside the protective channels (tulip, shelving, angle, wind-break, guide of air,...).
Deuxième mode de réalisation Second embodiment
Selon le deuxième mode de réalisation, l'organe de protection 20 du moyen optique comprend le canal de circulation 21 . According to the second embodiment, the protection member 20 of the optical means comprises the circulation channel 21.
Le canal de circulation 21 a subi un traitement anti-statique, par exemple tel que celui décrit dans la demande WO 2007071723. The circulation channel 21 has undergone anti-static treatment, for example such as that described in the application WO 2007071723.
Avantageusement, le canal de circulation 21 est constitué à base de polyméthalcrylate de méthyle avec un revêtement anti-statique de résistance superficielle définie, par exemple comprise entre 106 à 107 ohm. Advantageously, the circulation channel 21 consists of polymethyl methacrylate with an anti-static coating of defined surface resistance, for example between 10 6 to 10 7 ohm.
Selon ce mode de réalisation, le canal de circulation 21 est avantageusement optiquement transparent, ce qui permet de ne pas le munir d'orifice de passage des faisceaux lumineux incidents et réfléchis. According to this embodiment, the circulation channel 21 is advantageously optically transparent, which makes it possible not to provide it with a passage orifice for incident and reflected light beams.
Troisième mode de réalisation Third embodiment
Selon le troisième mode de réalisation, l'organe de protection 20 du moyen optique 2 comprend un canal de protection 31 de l'optique d'émission, c'est-à-dire la source 3 et les moyens de mise en forme du faisceau lumineux incident 10 et un canal de protection 32 de l'optique de réception. According to the third embodiment, the protection member 20 of the means optical 2 comprises a protection channel 31 of the transmission optics, that is to say the source 3 and the shaping means of the incident light beam 10 and a protection channel 32 of the reception optics .
Les canaux 31 et 32 assurent que les particules P de la matière particulaire ne se déposent ni sur la source 3 et le photorécepteur 4 ni sur les moyens de mise en forme, tels que les lentilles 15. The channels 31 and 32 ensure that the particles P of the particulate material are deposited neither on the source 3 and the photoreceptor 4 nor on the shaping means, such as the lenses 15.
Moyen de mise en dépression Means of depression
De préférence, le dispositif 1 comprend un moyen, non illustré, de mise en dépression de la zone d'analyse. Preferably, the device 1 comprises a means, not illustrated, of depression of the analysis zone.
Avantageusement, la chambre de mesure 5 est mise en dépression. Advantageously, the measurement chamber 5 is depressed.
Le moyen de mise en dépression comprend par exemple un ensemble de conduits maintenus à des pressions différentes, et/ou un ventilateur générant une différence de pression. The depression means comprises for example a set of conduits maintained at different pressures, and / or a fan generating a pressure difference.
Par exemple, quand le dispositif est implanté dans un système de qualité d'air, le dispositif forme tout ou partie d'un conduit secondaire relié à une conduite principale du système de qualité d'air. For example, when the device is implanted in an air quality system, the device forms all or part of a secondary duct connected to a main duct of the air quality system.
Un piquage de l'air est assuré dans une zone en surpression du conduit principal, en amont du dispositif, et un retour de l'air est assuré dans une zone de dépression du conduit d'air principal. A tapping of the air is provided in an overpressure zone of the main duct, upstream of the device, and a return of air is provided in a depression zone of the main air duct.
Quand le système de qualité d'air est intégré à un dispositif de chauffage, ventilation et/ou climatisation du véhicule automobile, la prise d'air amont est avantageusement située avant le passage dans un filtre, dans une zone de surpression de l'entrée d'air du dispositif de chauffage, ventilation et/ou climatisation du véhicule automobile ou dans une boîte à eau. When the air quality system is integrated with a heating, ventilation and / or air conditioning device of the motor vehicle, the upstream air intake is advantageously located before passing through a filter, in an overpressure zone of the inlet of the air heater, ventilation and / or air conditioning of the motor vehicle or in a water box.
La prise d'air aval est avantageusement localisée en aval du filtre et en amont de la roue du ventilateur, dans une zone de dépression. The downstream air intake is advantageously located downstream of the filter and upstream of the fan wheel, in a depression zone.
En variante, un élément additionnel tel qu'un ventilateur placé en aval du capteur permet de générer « artificiellement » cette différence de pression. Avantages Alternatively, an additional element such as a fan placed downstream of the sensor can "artificially" generate this pressure difference. Advantages
Comme déjà indiqué, le dispositif selon la présente invention permet une séparation du flux d'air chargé en particules d'une part et des éléments optiques d'autre part, ce qui assure que les particules ne puissent se déposer ni sur les lentilles, ni sur la source lumineuse, ni sur le photorécepteur. As already indicated, the device according to the present invention allows a separation of the charged air flow particles on the one hand and optical elements on the other hand, which ensures that the particles can not be deposited on the lenses or on the light source, nor on the photoreceptor.
De ce fait, la durée de vie du dispositif est augmentée et la maintenance sur le dispositif peut se faire sur une fréquence faible, de l'ordre de chaque dizaine d'années. As a result, the lifetime of the device is increased and maintenance on the device can be done on a low frequency, of the order of ten years or so.

Claims

REVENDICATIONS
1 . Dispositif de détection de matière particulaire dans un flux d'air (F) pour un véhicule automobile, comprenant un moyen optique (2) pour la détection de la matière particulaire dans ledit flux d'air, ledit moyen optique (2) comprenant une source lumineuse (3) apte à émettre des ondes lumineuses, un élément de réception (4) apte à recevoir des ondes lumineuses, le dispositif (1 ) comprenant une zone dite zone d'analyse (8) et configurée pour que ledit flux d'air (F) y circule, la source lumineuse (3) étant disposée de sorte à émettre des ondes lumineuses dans la zone d'analyse (8) et l'élément de réception (4) étant disposé de sorte à recevoir des ondes lumineuses provenant de la zone d'analyse (8), le dispositif (1 ) comprenant un organe de protection (20) du moyen optique (2) agencé de sorte à empêcher des particules (P) de la matière particulaire de se déposer sur ledit moyen optique (2). 1. Device for detecting particulate matter in an air flow (F) for a motor vehicle, comprising optical means (2) for detecting particulate matter in said air stream, said optical means (2) comprising a source light source (3) able to emit light waves, a reception element (4) able to receive light waves, the device (1) comprising a zone called analysis zone (8) and configured so that said air flow (F) circulates therein, the light source (3) being arranged to emit light waves into the analysis zone (8) and the receiving element (4) being arranged to receive light waves from the analysis zone (8), the device (1) comprising a protection member (20) of the optical means (2) arranged to prevent particles (P) of the particulate material from being deposited on said optical means ( 2).
2. Dispositif de détection selon la revendication 1 , dans lequel l'organe de protection (20) comprend un canal de circulation (21 ) du flux d'air (F) dans la zone d'analyse (8). 2. Detection device according to claim 1, wherein the protection member (20) comprises a circulation channel (21) of the air flow (F) in the analysis zone (8).
3. Dispositif de détection selon la revendication précédente, dans lequel le canal de circulation (21 ) comprend un orifice de passage des ondes lumineuses issues de la source lumineuse (3), dit premier orifice (22), et/ou un orifice de passage des ondes lumineuses provenant de la zone d'analyse, dit deuxième orifice (23). 3. Detection device according to the preceding claim, wherein the circulation channel (21) comprises a passage for the passage of light waves from the light source (3), said first orifice (22), and / or a passage orifice. light waves from the analysis zone, said second orifice (23).
4. Dispositif de détection selon la revendication précédente, dans lequel l'organe de protection (20) comprend un canal, dit premier canal, de protection supplémentaire (25) dont une extrémité est formée par le premier orifice (22) et/ou un autre canal, dit deuxième canal, de protection supplémentaire (26) dont une extrémité est formée par le deuxième orifice (23). 4. Detection device according to the preceding claim, wherein the protective member (20) comprises a channel, said first channel, additional protection (25), one end of which is formed by the first orifice (22) and / or a another channel, said second channel, of additional protection (26), one end of which is formed by the second orifice (23).
5. Dispositif de détection selon la revendication précédente, dans lequel le premier canal de protection (25) s'étend angulairement relativement à une direction principale du canal de circulation (21 ), et/ou le deuxième canal de protection (26) s'étend angulairement relativement à une direction principale du canal de circulation (21 ). 5. Detection device according to the preceding claim, wherein the first protective channel (25) extends angularly relative to a main direction of the circulation channel (21), and / or the second protection channel (26) s' extends angularly relative to a main direction of the circulation channel (21).
6. Dispositif de détection selon l'une des revendications 2 à 5, dans lequel le canal de circulation (21 ) présente une section variable sur sa longueur. 6. Detection device according to one of claims 2 to 5, wherein the circulation channel (21) has a variable section along its length.
7. Dispositif de détection selon la revendication précédente, dans lequel une section du canal de circulation (21 ) en amont du premier orifice (22) et/ou du deuxième orifice (23) relativement à une direction d'écoulement du flux d'air est inférieure à une section du canal de circulation (21 ) en aval du premier et/ou du deuxième orifice (23). 7. Detection device according to the preceding claim, wherein a section of the circulation channel (21) upstream of the first orifice (22) and / or the second orifice (23) relative to a direction of flow of the air flow. is less than a section of the circulation channel (21) downstream of the first and / or second orifice (23).
8. Dispositif de détection selon la revendication 6, dans lequel le canal de circulation (21 ) est muni d'un moyen de restriction de section (24) en amont du premier orifice (22) et/ou du deuxième orifice (23) relativement à une direction d'écoulement du flux d'air (F). The detection device according to claim 6, wherein the circulation channel (21) is provided with section restriction means (24) upstream of the first orifice (22) and / or the second orifice (23) relatively at a flow direction of the air flow (F).
9. Dispositif de détection selon l'une des revendications précédentes, dans lequel l'organe de protection (20) est traité anti-statiquement. 9. Detection device according to one of the preceding claims, wherein the protective member (20) is anti-statically treated.
10. Dispositif de détection selon l'une des revendications précédentes, comprenant un moyen de mise en dépression de la zone d'analyse (8). 10. Detection device according to one of the preceding claims, comprising a means of depression of the analysis zone (8).
1 1 . Système de qualité d'air pour véhicule automobile, comprenant un dispositif de détection de matière particulaire selon l'une des revendications précédentes, et un moyen de purification d'un flux d'air à destination d'un habitacle du véhicule automobile. 1 1. An air quality system for a motor vehicle, comprising a particulate matter detection device according to one of the preceding claims, and means for purifying an air flow to a passenger compartment of the motor vehicle.
12. Dispositif de chauffage, ventilation et/ou climatisation pour véhicule automobile, comprenant un système de qualité d'air selon la revendication précédente. 12. Heater, ventilation and / or air conditioning for a motor vehicle, comprising an air quality system according to the preceding claim.
PCT/FR2017/053384 2016-12-20 2017-12-05 Device for detecting particulate matter in an airflow for a motor vehicle WO2018115620A1 (en)

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