WO2020104112A1 - Capteur compact de particules présentant un guidage interne au capteur de gaz de mesure - Google Patents

Capteur compact de particules présentant un guidage interne au capteur de gaz de mesure

Info

Publication number
WO2020104112A1
WO2020104112A1 PCT/EP2019/077706 EP2019077706W WO2020104112A1 WO 2020104112 A1 WO2020104112 A1 WO 2020104112A1 EP 2019077706 W EP2019077706 W EP 2019077706W WO 2020104112 A1 WO2020104112 A1 WO 2020104112A1
Authority
WO
WIPO (PCT)
Prior art keywords
carrier substrate
particle sensor
electrode
opening
cavity
Prior art date
Application number
PCT/EP2019/077706
Other languages
German (de)
English (en)
Inventor
Radoslav Rusanov
Oliver Krayl
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP19787234.4A priority Critical patent/EP3884263A1/fr
Publication of WO2020104112A1 publication Critical patent/WO2020104112A1/fr

Links

Classifications

    • 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
    • G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
    • 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 present invention relates to a particle sensor with a carrier substrate, a corona discharge electrode, a ground electrode and at least one measuring electrode, which electrodes are arranged adhesively on the carrier substrate.
  • particle includes suspended particles that float in a fluid and are transported with the fluid.
  • the particles can be solid or liquid particles (aerosol particles or aerosol droplets).
  • the fluid can be a liquid or a gas.
  • a corona discharge is an electrical discharge at first
  • non-conductive medium in which free charge carriers are generated by ionizing components of the medium.
  • the particles are charged by adhering ions.
  • the charge is usually measured by measuring the mirror charge of the previously charged particles on a measuring electrode (influenza) or by measuring the charge missing by leaving the previously charged particles, which is carried out on a virtual GND electrode to prevent this electrode from being charged (escaping current).
  • the ions from the corona discharge, which do not adhere to a particle are preferably caused by an electric field Filtered out ion trap electrode.
  • the corona current is preferably generated in the form of a pulse train.
  • EP 2 247 939 A1 describes one that works with an ejector principle
  • Particle sensor known. Compressed air is blown into the particle sensor from a nozzle, and exhaust gas serving as measuring gas is drawn in via the Venturi effect. The corona discharge takes place in an "ion generation section".
  • the ions generated in this process are blown into a "electric charge section" via a nozzle with pressurized air, to which sample gas is fed via a further inlet.
  • the particles floating in the sample gas are charged by adhering ions.
  • the use of compressed air achieves the advantage of a large sample gas flow through the particle sensor, which is that of the outside of the particle sensor
  • the electrical charge of these particles or the electrical current that escapes from the high-voltage particle sensor as a result of the transport of the charged particles with the exhaust gas flow is then measured.
  • this current also referred to as “escaping current”
  • the corona discharge therefore takes place spatially separated from the measuring gas, the loading of which is to be measured with particles.
  • the sample gas inlet opening is located behind (in the flow of ions: downstream) the corona discharge electrode.
  • a disadvantage here is the indirect / diffusive charging of the particles by the ions transported with the compressed air, as a result of which the charge per particle is smaller than when charging takes place directly in the ion drift zone of the corona discharge.
  • W02004027394 A1 does not go into detail about the generation of the fluid flow.
  • the particles are charged in the ion drift zone of the corona discharge.
  • the filtering of the excess ions takes place via a network-like structure.
  • the detection of the charge of the particles takes place by deflecting them on various detection electrode rings by means of further electrodes in the middle of a sensor channel. This will be a
  • Short circuit paths can lead, which can lead to a failure of the sensor function.
  • the present invention differs from the prior art mentioned at the outset by the characterizing features of claim 1.
  • the particle sensor is characterized in that a part of the carrier substrate carrying the electrodes is covered with a hollow body which is designed such that the part of the carrier substrate forms a cavity together with the hollow body, which cavity has at least a first opening and at least a second one Has opening, wherein the first opening is arranged closer to the corona electrode than the measuring electrode and wherein the second opening is arranged closer to the measuring electrode than the corona electrode and that electronic functional components of the particle sensor are arranged on the carrier substrate are.
  • the cavity forming the measuring channel can e.g. created by a metallic lid.
  • the integration of a fan or pump is also possible here as an option.
  • Particle sensors which are able to detect the smallest particles ( ⁇ 300 nm, in particular ⁇ 100 nm) and measure their concentration.
  • the sensor according to the invention is able to do this.
  • Particle sensor can be used in connection with exhaust gas from combustion processes (combustion engines, stoves) and as an air quality sensor, e.g. for indoor air in the Vehicle interior, in living rooms, at workplaces, or as part of air conditioning systems.
  • combustion processes combustion engines, stoves
  • air quality sensor e.g. for indoor air in the Vehicle interior, in living rooms, at workplaces, or as part of air conditioning systems.
  • Another advantage of the particle sensor according to the invention is that it is also particularly compact and inexpensive since, in comparison to the prior art according to EP 2 247 939 A1, no complex shielding is necessary.
  • Particle sensors that generate actively driven sample gas flows are the subject of dependent claims.
  • the measuring principle proposed here is based on a contactless measurement of the mirror charge of the particles flying over an electrode. It is not necessary to attach the articles to structures of the particle sensor. This significantly reduces the risk of contamination.
  • the particle sensor according to the invention has only an insignificant dependence of the sensor signal on the flow rate of the measurement gas.
  • the sensitivity of the particle sensor according to the invention is advantageously greater than in the case of particle sensors working with i n d i rect-iff u si charging.
  • Lifespan of the particle sensor according to the invention is not restricted by the accumulation of soot particles.
  • Particle sensor is inexpensive because, due to the arrangement of the electrodes in the cavity forming a measuring channel, it does not require any complex shielding and insulation, even in the electronics.
  • the cavity forming a measuring channel has the further advantage that high gas flows through the sensor are possible, which increases the sensitivity.
  • Particle sensor additionally has an ion trap electrode, which in the
  • Sample gas flow is arranged upstream of the measuring electrode.
  • the electronic functional elements include a high-voltage source, the high-voltage source being connected to the corona electrode in an electrically conductive manner via at least one conductor track. If an ion trap electrode is present, it is preferred that it is connected in an electrically conductive manner to the high-voltage source via a further conductor track.
  • the electronic functional elements additionally include a charge amplifier, which is connected to the measuring electrode in an electrically conductive manner via at least one conductor track.
  • the electronic functional components also include a microprocessor, which is connected in an electrically conductive manner to the high-voltage source and the charge amplifier via conductor tracks.
  • Another preferred embodiment is characterized in that the hollow body is electrically conductive.
  • the hollow body is made of electrically conductive material or has an electrically conductive coating on its side facing the electrodes adhering to the carrier substrate and is electrically conductively connected to a ground potential in both alternatives.
  • the carrier substrate is a printed circuit board.
  • a further preferred embodiment is characterized in that the hollow body is a tube that has a long side that has an opening and that the carrier substrate projects through the opening into the interior of the tube.
  • a pump is arranged outside the cavity, by means of which the measurement gas can be blown into the cavity through the first opening. It is further preferred that a pump is arranged outside the cavity, with which measuring gas can be sucked out of the cavity through the second opening.
  • a further preferred embodiment is characterized in that a filter is arranged between the second opening and the pump, through which the pump sucks measuring gas out of the cavity.
  • the pump is an electrically driven pump or a suction jet pump.
  • a further preferred embodiment is characterized in that the carrier substrate has a first carrier substrate part, on which the electrodes are adhered and to which the hollow body is attached, and a second
  • Carrier substrate part on which the electronic functional components are arranged wherein the two carrier substrate parts are rigidly connected to one another.
  • the first carrier substrate part consists of a first material and that the second carrier substrate part consists of a second material and that the first material has a different material composition than the second material.
  • the first material is a ceramic material and that the second material is a printed circuit board material.
  • FIG. 1 shows a technical environment of the invention in the form of an exhaust pipe and a particle sensor
  • FIG. 2 shows a cross section of a carrier substrate of a particle sensor which carries various electrodes
  • Figure 3 is a plan view of a carrier substrate with electronic
  • FIG. 4 shows a cross section of a possible embodiment of the particle sensor from FIG. 3;
  • Figure 5 shows a cross section of a further possible embodiment of the
  • Figure 6 is a plan view of a carrier substrate of another
  • FIG. 7 shows a plan view of a carrier substrate with a mammal pump which is arranged behind the second opening of the cavity on the carrier substrate;
  • FIG. 8 shows a plan view of a carrier substrate with a pump which is arranged laterally from the cavity on the carrier substrate;
  • FIG. 9 shows a plan view of a carrier substrate with a pump which is arranged laterally from the cavity on the carrier substrate.
  • Figure 10 is a plan view of a carrier substrate with a mammal pump, which is arranged behind the second opening of the cavity on the carrier substrate.
  • the particle sensor 12 protrudes into an exhaust pipe 18, which carries exhaust gas as the measurement gas 20, and has a tube arrangement of an inner metallic tube 22 and an outer metallic tube 24 projecting into the flow of the measuring gas 20 .
  • an exhaust pipe 18 which carries exhaust gas as the measurement gas 20
  • the two metallic tubes 22, 24 preferably have a general one
  • the base areas of the cylindrical shapes are preferably circular, elliptical or polygonal.
  • the cylinders are preferably arranged coaxially, the axes of the cylinders lying transversely to the flow direction of the measurement gas 20 which prevails in the exhaust pipe 18 outside the pipe arrangement.
  • the inner metallic tube 22 protrudes beyond the outer metallic tube 24 into the flowing measurement gas 20 at a first end 26 of the tube arrangement facing away from the installation opening in the exhaust gas tube 18.
  • the outer metallic tube 24 projects beyond the inner metallic tube 22 at a second end 28 of the two metallic tubes 22, 24 facing the installation opening in the exhaust pipe 18.
  • the inside diameter of the outer metallic tube 24 is preferably so much larger than the outer diameter of the inner one
  • the clear width W of the inner metallic tube 22 forms a second flow cross section.
  • Flow cross section enters the tube arrangement at the first end 26, then changes its direction at the second end 28 of the tube arrangement, enters the inner metallic tube 22 and is sucked out of the measuring gas 20 flowing past. This results in a laminar flow in the inner metallic tube 22.
  • This tube arrangement of tubes 22, 24 is with a preferred embodiment of an inventive
  • Particle sensor is attached so as to protrude transversely to the direction of flow of the + measurement gas 20 in the exhaust pipe 18 on the exhaust pipe 18 and laterally into the flow of the measurement gas 20, the interior of the metallic pipes 22, 24 preferably being sealed off from the surroundings of the exhaust pipe 18.
  • the attachment is preferably carried out with a screw connection.
  • a carrier substrate 34 is arranged in the inner metallic tube 22 and bears an electrode arrangement 36 having a plurality of electrodes adhering there.
  • the electrodes of the electrode arrangement 36 are exposed to the measuring gas 20 flowing past.
  • FIG. 2 shows a cross section of a carrier substrate 34 of a particle sensor, which carries various electrodes, and serves to illustrate the working principle of a planar one working with a corona discharge
  • a corona discharge electrode 40, a ground electrode 42 and, optionally, an ion-trapping electrode 44 are arranged on the electrically insulating carrier substrate 34.
  • the carrier substrate 34 additionally carries a measuring electrode 46 serving as a particle charge detection electrode.
  • a heating element 50 in the form of a heating electrode adhering there is arranged on a rear side 48 of the carrier substrate 34.
  • the longitudinal direction of the carrier substrate 34 is arranged parallel to the direction of the measuring gas 20 flowing there in the inner metallic tube 22 of FIG. 1. Via this arrangement of corona discharge electrode 40, ground electrode 42, optional ion trap electrode 44 and measuring electrode 46, measuring gas 20 flows with the one indicated by the direction of the arrow
  • the corona discharge takes place between the corona discharge electrode 40 and the ground electrode 42 in a corona discharge zone 52.
  • the corona discharge zone 52 is traversed by measuring gas 20 loaded with particles.
  • the measuring gas 20 present there is partially ionized in the corona discharge zone 52.
  • the particles then take up ions and thus an electrical charge.
  • the ground electrode could optionally also be arranged outside the substrate (e.g. on the protective tube).
  • the optional ion-trapping electrode 44 traps ions that do not adhere to the heavier and therefore more inert particles transported with the measurement gas 20.
  • the protective tube 22, not shown in FIG. 2, can serve as a counter electrode for the ion trapping electrode 44.
  • the measurement of the electrical charge transported with the soot particles is carried out either by means of
  • FIG. 3 shows a plan view of a carrier substrate 34 with electronic functional components 58, 60, 62, electrodes 40, 44, 46 and the hollow body forming a measuring channel with its two openings 66, 68.
  • FIG. 3 illustrates in particular the arrangement of electrodes 40, 44, 46 and electronic functional components 58, 60, 62 on a common substrate 34 resulting compact structure, which allows a small sensor size and cost-effective production. This is particularly the case if a (PCB) printed circuit board is used as the carrier substrate 34, on which the electronic functional components and the electrodes are realized.
  • PCB printed circuit board
  • the ion trapping and measuring electrodes 44, 46 can be used as pads on the carrier substrate and the corona electrode 40 as a planar tip or as a (Pt) wire which lies, for example, on the carrier substrate or protrudes from the carrier substrate 34 or above one Recess in this lies, are to be executed. All of these are inexpensive manufacturing methods.
  • functional components include a high-voltage source 58, a charge amplifier 62 and, optionally, a microcontroller 60.
  • the high-voltage source 58 is connected to the corona electrode 40 and the ion-trapping electrode 44 via conductor tracks and is controlled by the microcontroller 60.
  • the charge amplifier 62 present here is connected to the measurement electrode 46 present here and transmits its signal to the microcontroller 60.
  • the electrical connection between the charge amplifier and the measurement electrode itself is in one embodiment by a guard conductor around the measurement electrode and the associated one Cable shielded.
  • Microcontroller 60 is connected to output 39 via cable harness 14.
  • the electronic functional components 58, 60, 62 are also supplied with electrical energy via the cable harness 14.
  • the carrier substrate 34 consists, for example, of printed circuit board material.
  • the part of the carrier substrate carrying the electrodes is covered with the hollow body 35, which is designed such that the carrier substrate 34 forms a cavity together with the hollow body 35.
  • the cavity and thus the hollow body 35 has at least one first opening 66 and at least one second opening 68.
  • the first opening 66 is closer to the corona electrode 40 than to the Measuring electrode 46 is arranged, and the second opening 68 is arranged closer to the measuring electrode 46 than to the corona electrode 40.
  • the hollow body 35 forms a measuring channel for a particle-containing fluid flow.
  • the hollow body 35 is a semicircular-cylindrical cover which rests on the carrier substrate 34 with its edges connecting the openings 66, 68. Where one of the edges crosses a conductor track, the conductor track is electrically insulated from the edge or from electrically conductive regions of the hollow body 35.
  • the electronic functional components 58, 60, 62 (and possibly further ones) are preferably arranged outside of the cavity on the carrier substrate 34.
  • the hollow body 35 is electrically conductive.
  • it consists of electrically conductive material, or it has an electrically conductive coating on its side facing the electrodes adhering to the carrier substrate.
  • the hollow body 35 is preferably connected in an electrically conductive manner to a ground potential.
  • the hollow body 35 can therefore serve as a counter electrode for other electrodes (corona, ion scavenger).
  • Figure 4 shows a cross section of a possible embodiment of the
  • the carrier substrate 34 extends over the entire width of the hollow body and the arrangement of the electronic functional components 58, 60, 62 (and possibly other ones).
  • the hollow body 35 and the carrier substrate form channel walls of a measuring channel, in which the electrodes are arranged and in which the measuring gas via the
  • Electrodes flow away.
  • FIG. 5 shows a cross section of a further possible embodiment of the particle sensor from FIG. 3.
  • the measurement channel is realized by a tube which is also open at the side as a hollow body 35 or by two semi-cylindrical covers. In both cases, it is possible that the part of the carrier substrate 34 covering the measuring channel with the circuit board part of the circuit board carrying the electronic functional components 58, 60, 62
  • Carrier substrates 34 is in one piece, or of a different material exists, which is rigidly connected to the circuit board part of the carrier substrate 34.
  • the hollow body 35 and the carrier substrate 34 form channel walls of a measuring channel in which the electrodes 40, 44, 46 are arranged and in which the measuring gas flows over the electrodes 40, 44, 46.
  • FIG. 6 shows a top view of a carrier substrate 34 of another
  • Embodiment of a particle sensor according to the invention Embodiment of a particle sensor according to the invention.
  • Carrier substrate 34 differs from the carrier substrate 34 of FIGS. 3 to 5 in that outside the cavity forming a measuring channel, a fan or a pump 70 on the carrier substrate in front of the
  • the first opening 66 serving the measurement gas inlet opening is arranged on the carrier substrate 34. Measuring gas 20 can be blown into the cavity with the pump 70.
  • FIG. 7 shows a plan view of a carrier substrate 34 with a mammal pump 72, which is arranged behind the second opening 68 of the cavity on the carrier substrate 34. Measuring gas 20 can be sucked out of the cavity with the mammal pump 72 and thus through the measuring channel and over the
  • Electrodes 40, 44, 46 are sucked. Compared to blowing in, this embodiment has the advantage that the particles are not influenced by the nursing pump 72.
  • FIG. 8 shows a plan view of a carrier substrate 34 with a pump 74, which is arranged on the side of the cavity on the carrier substrate 34 and which generates a compressed air stream which enters the measuring channel via a Venturi nozzle arranged in the cavity and thereby according to the suction jet pump principle
  • Sample gas that can enter the cavity through the first opening sucks into the cavity.
  • FIG. 9 shows a plan view of a carrier substrate 34 with a pump 74, which is arranged on the side of the cavity on the carrier substrate 34 and which generates a compressed air stream 78 which enters the measuring channel via a Venturi nozzle 76 arranged in the cavity and thereby follows the suction jet pump principle, measuring gas 20, which can enter the cavity via at least one lateral opening in a wall of the hollow body 35, sucks into the cavity.
  • a filter to be used in the air flow drawn in by the pump. This increases the lifespan.
  • the particles transported in the sample gas are not influenced by the pump.
  • FIG. 10 shows a plan view of a carrier substrate 34 with a mammal pump 72, which is arranged downstream of the second opening 68 of the hollow body 35 on the carrier substrate 34.
  • Measuring gas 20 can be sucked out of the cavity with the sucking pump 72 and thus sucked through the measuring channel.
  • a filter 80 is arranged between the cavity and the breast pump 72. This increases the life of the mammal pump 72 and the

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

L'invention concerne un capteur de particules (12) présentant un substrat support (34), une électrode de décharge à effet couronne (40), une électrode de masse (42) et au moins une électrode de mesure (46), lesquelles électrodes (40, 46) sont disposées par adhérence sur le substrat support (34). Le capteur de particules est caractérisé en ce qu'une partie portant les électrodes (40, 46) du substrat support (34) est recouverte par un corps creux (35) qui est conçu de manière telle que la partie du substrat support (34) forme, conjointement avec le corps creux (35), une cavité, laquelle cavité présente au moins une première ouverture (66) et au moins une deuxième ouverture (68), la première ouverture (66) étant disposée plus près de l'électrode de décharge à effet couronne (40) que de l'électrode de mesure (46) et la deuxième ouverture (68) étant disposée plus près de l'électrode de mesure (46) que de l'électrode de décharge à effet couronne (40) et en ce que des composants fonctionnels électroniques (58, 60, 62) du capteur de particules (12) sont disposés sur le substrat support (34).
PCT/EP2019/077706 2018-11-23 2019-10-14 Capteur compact de particules présentant un guidage interne au capteur de gaz de mesure WO2020104112A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19787234.4A EP3884263A1 (fr) 2018-11-23 2019-10-14 Capteur compact de particules présentant un guidage interne au capteur de gaz de mesure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018220141.2 2018-11-23
DE102018220141.2A DE102018220141A1 (de) 2018-11-23 2018-11-23 Kompakter Partikelsensor mit sensorinterner Messgasführung

Publications (1)

Publication Number Publication Date
WO2020104112A1 true WO2020104112A1 (fr) 2020-05-28

Family

ID=68242689

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/077706 WO2020104112A1 (fr) 2018-11-23 2019-10-14 Capteur compact de particules présentant un guidage interne au capteur de gaz de mesure

Country Status (3)

Country Link
EP (1) EP3884263A1 (fr)
DE (1) DE102018220141A1 (fr)
WO (1) WO2020104112A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021201327B4 (de) 2021-02-12 2022-09-08 Vitesco Technologies GmbH Sensoreinheit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004027394A1 (fr) 2002-09-12 2004-04-01 Robert Bosch Gmbh Procede et dispositif pour mesurer la concentration de particules contenues par un ecoulement gazeux
EP2247939A1 (fr) 2008-03-04 2010-11-10 Pegasor OY Procédé et appareil de mesure de particules
EP2824453A1 (fr) 2012-02-21 2015-01-14 Ngk Spark Plug Co., Ltd. Détecteur de microparticules
WO2017208889A1 (fr) * 2016-06-03 2017-12-07 日本碍子株式会社 Élément de génération de charges et détecteur de nombre de particules fines
WO2018163845A1 (fr) * 2017-03-10 2018-09-13 日本碍子株式会社 Élément de génération de charge et détecteur de comptage de microparticules
WO2018212156A1 (fr) * 2017-05-15 2018-11-22 日本碍子株式会社 Détecteur de comptage de particules fines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004027394A1 (fr) 2002-09-12 2004-04-01 Robert Bosch Gmbh Procede et dispositif pour mesurer la concentration de particules contenues par un ecoulement gazeux
EP2247939A1 (fr) 2008-03-04 2010-11-10 Pegasor OY Procédé et appareil de mesure de particules
EP2824453A1 (fr) 2012-02-21 2015-01-14 Ngk Spark Plug Co., Ltd. Détecteur de microparticules
WO2017208889A1 (fr) * 2016-06-03 2017-12-07 日本碍子株式会社 Élément de génération de charges et détecteur de nombre de particules fines
WO2018163845A1 (fr) * 2017-03-10 2018-09-13 日本碍子株式会社 Élément de génération de charge et détecteur de comptage de microparticules
WO2018212156A1 (fr) * 2017-05-15 2018-11-22 日本碍子株式会社 Détecteur de comptage de particules fines

Also Published As

Publication number Publication date
DE102018220141A1 (de) 2020-05-28
EP3884263A1 (fr) 2021-09-29

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