Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/84—Systems specially adapted for particular applications
  • G01N21/85—Investigating moving fluids or granular solids
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
  • G01N15/06—Investigating concentration of particle suspensions
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
  • G01N21/47—Scattering, i.e. diffuse reflection
  • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
  • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
  • G01N15/06—Investigating concentration of particle suspensions
  • G01N15/075—Investigating concentration of particle suspensions by optical means
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
  • G01N2015/0042—Investigating dispersion of solids
  • G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke

Definitions

• the invention relates to a system 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 be inhaled.
• Such a detection system makes it possible to act 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 specially dedicated module.
• 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 particulate matter detection system detects an amount of particulate matter in the airflow to the passenger compartment above a threshold value, it is possible that the air quality system triggers the air purifier. 'air.
• the detection system includes a dedicated fan to generate the flow of air circulating in the system, which increases the mass and the size of the detection system, as well as the consumption of the vehicle, because of the power supply. of the fan.
• the object of the invention is to remedy at least partially this disadvantage.
• the subject of the invention is a system for detecting particulate matter in an air flow, referred to as the air flow to be analyzed, for a motor vehicle, comprising an optical means for detecting the particulate matter in said air flow, said optical means comprising a light source capable of emitting waves light and a receiving element adapted to receive light waves, the system comprising an area called analysis zone configured so that said flow of air to be analyzed flows therein, the light source being arranged so as to emit light waves in the analysis zone, the system comprising a venturi effect device for driving said air flow to be analyzed.
• the system comprises a circulation channel of said air flow to be analyzed delimiting the analysis zone.
• said device having a venturi effect comprises a circulation channel of another air flow, called a driving air flow, in fluidic relation with the circulation channel of said air flow. to analyze.
• the circulation channel of the driving air flow comprises an inlet of the air flow to be analyzed, said air inlet being disposed downstream of the analysis zone relative to the direction flow of the air stream to be analyzed.
• the circulation channel of the driving air flow and the flow channel of the flow that is to be analyzed extend substantially orthogonally relative to one another.
• the invention also relates to an air quality system for a motor vehicle, comprising a particulate matter detection system as described above and a means of purifying an air flow to a passenger compartment of the vehicle automobile.
• the air quality system comprises an air inlet.
• the purification device comprises an air filter disposed in said air inlet.
• the air quality system comprises a volute of air circulation in fluidic relation with the air inlet.
• the volute comprises a cover, the air filter being disposed in contact with the cover of the volute.
• the purification device comprises an ionizing element.
• the air quality system comprises an air outlet.
• the ionizer element is disposed in contact with the air outlet.
• the air quality system comprises a stitching in the outlet configured to supply the device for detecting particulate matter in airflow to be analyzed.
• the stitching is configured to supply air to the ionizing element.
• the air quality system comprises a protective grille of the air outlet.
• the invention also relates to a heating, ventilation and / or air conditioning system for a motor vehicle, comprising an air quality system as described above.
• FIG. 1 illustrates a longitudinal sectional view of a particulate matter detection system according to a principle view of the present invention
• FIG. 2 illustrates a perspective view of an outside of an air quality system equipped with the detection system of FIG. 1;
• FIG. 3 illustrates a perspective view of an interior of the system of FIG. 2;
• FIG. 4 illustrates another perspective view of an interior (without grille) of an air quality system equipped with the detection system of FIG. 1.
• the invention relates to a particulate matter detection system 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 system 1 is particularly applicable to an air quality system of a motor vehicle, detailed later.
• F the flow of air to be analyzed
• the air flow F carries particles referenced P of the particulate matter.
• System 1 comprises optical means 2 for the detection of particulate matter in the air flow F.
• the optical means 2 comprises a light source 3 able to emit light waves.
• the light source 3 is for example a laser diode.
• the optical means 2 also comprises a reception element able to receive light waves, referenced 4.
• the receiving element is called a photoreceptor.
• the system 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.
• the light source 3 is arranged to emit light waves in the analysis zone 8.
• the photoreceptor 4 is arranged to receive light waves coming from the analysis zone 8.
• the main direction of the light beam 10 makes a non-zero angle with the flow direction of the air flow F.
• the light beam 10 is deflected in multiple directions by interaction with the particles suspended in the air stream, in particular in the direction of the photoreceptor 4.
• the photoreceptor 4 is arranged to receive a light beam 12.
• the photoreceptor 4 operates in a range of wavelength values consistent with the wavelength or wavelengths of the light beam 12, which possibly coincides with a range of operating wavelengths of the light source 3.
• the optical means also comprises one or more elements (not illustrated) for shaping the incident light beam 10 and the scattered light beam 12, such as lenses, for example.
• the chamber 5 constitutes a circulation channel of the air flow to be analyzed F, referenced 13, in which the analysis zone 8 is delimited.
• the system 1 comprises a device with a venturi effect for driving the flow of air to be analyzed F, referenced 16.
• the device venturi effect 16 comprises a circulation channel 17 of another air flow, said entrainment air flow, and noted F ', in fluidic relation with the circulation channel 13 of the air flow to analyze F.
• the circulation channel 17 comprises an inlet 18 and an outlet 19 of the air flow F '.
• the circulation channel 17 also comprises an inlet 20 of the air stream to be analyzed F.
• the air inlet 20 coincides with the outlet 7 of the circulation channel 13.
• the air inlet 20 is disposed downstream of the analysis zone 8 relative to the direction of flow of the air flow to be analyzed F.
• the circulation channel 17 and the circulation channel 13 extend substantially orthogonally relative to one another.
• the flow of air F 'flowing in the circulation channel 17 causes by Venturi effect the circulation of the air flow F in the circulation channel 13 from the inlet 6 to the outlet 7, where the air flow F joins the air flow F '.
• the invention also relates to an air quality system for a motor vehicle, equipped with the particulate matter detection system 1.
• the air quality system makes it possible to depollute the air intended to supply the passenger compartment of the motor vehicle.
• the air quality system is referenced 30.
• the air quality system is a self-contained module, possibly installed in a heating, ventilation and / or air conditioning system for a motor vehicle, or in a central console or a ceiling lamp of a motor vehicle. .
• the air quality system 30 comprises a shell 31, preferably consisting of two half-shells. As can be seen in FIGS. 3 and 4, the air quality system 30 comprises inside the enclosure 31 a device 32 for purifying an air flow F "intended for a passenger compartment of the motor vehicle .
• the purification device 32 comprises at least one air filter and / or at least one ionizer element for cleaning the air flow before entering the passenger compartment of the vehicle.
• the purification device 32 comprises an air filter 33 and an ionizing element 34.
• the air quality system 30 has an inlet 35 between the air flow F "and an outlet 36 through which the air flow F" exits the system 30.
• the inlet 35 is constituted by a cover 37 disposed at a distance from a slot 38.
• the system 30 comprises a fan or blower capable of generating the air flow F ".
• FIG. 2 comprises a centrifugal blower or blower consisting of an impeller driven by an electric motor, brushed or electronically commutated, and a volute 39 capable of collecting and channeling the air. .
• the air is drawn axially through an inlet 35 and a filter 33 upstream of the blower.
• the discharge of the air is done radially in the volute 39 which ends with a duct 41.
• the latter leads to an exit 36.
• the ionizing element 34 is disposed in contact with the conduit 41.
• the ionizer element 34 is disposed on the same side of the system 30 as the filter 33.
• the duct 41 is provided with a stitching 43 configured to feed the detection device 1 of particulate matter into an air stream to be analyzed F.
• Another possible embodiment consists of placing the stitching 43 upstream of the fan in the air inlet 35.
• the system 30 comprises a gate 44 for protecting the air outlet.
• the system 1 detects an amount of particulate matter in the airflow to the passenger compartment greater than a threshold value, it is possible that the air quality system triggers the ionizer element.
• the invention also relates to a heating, ventilation and / or air conditioning system for a motor vehicle, comprising the air quality system 30.
• the detection system 1 is devoid of a fan, because of the presence of the venturi effect driving device 16, which allows it to be light and compact.
• the air quality system 30 equipped with the detection system 1 is also lighter and more compact, which allows it to be installed in any appropriate place of the vehicle.

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• Chemical & Material Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Health & Medical Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Dispersion Chemistry (AREA)
• Air-Conditioning For Vehicles (AREA)
• Investigating Or Analysing Materials By Optical Means (AREA)
• Sampling And Sample Adjustment (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=57485659

Family Applications (1)

Country Status (5)

Families Citing this family (12)

Family Cites Families (13)

• 2016
  • 2016-09-09 FR FR1658432A patent/FR3055967B1/fr not_active Expired - Fee Related
• 2017
  • 2017-09-06 EP EP17768498.2A patent/EP3510385A1/de not_active Withdrawn
  • 2017-09-06 WO PCT/FR2017/052360 patent/WO2018046845A1/fr not_active Ceased
  • 2017-09-06 JP JP2019513302A patent/JP2019529217A/ja active Pending
  • 2017-09-06 CN CN201780054351.2A patent/CN109690298A/zh active Pending

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