WO2018215203A1 - Capteur de particules - Google Patents

Capteur de particules Download PDF

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Publication number
WO2018215203A1
WO2018215203A1 PCT/EP2018/061910 EP2018061910W WO2018215203A1 WO 2018215203 A1 WO2018215203 A1 WO 2018215203A1 EP 2018061910 W EP2018061910 W EP 2018061910W WO 2018215203 A1 WO2018215203 A1 WO 2018215203A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
outlet channel
common axis
sensor
particle sensor
Prior art date
Application number
PCT/EP2018/061910
Other languages
German (de)
English (en)
Inventor
Radoslav Rusanov
Imke Heeren
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 KR1020197034079A priority Critical patent/KR20200011422A/ko
Priority to EP18723498.4A priority patent/EP3631406A1/fr
Priority to CN201880033979.9A priority patent/CN110678728A/zh
Publication of WO2018215203A1 publication Critical patent/WO2018215203A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
    • 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 invention relates to a particle sensor, in particular a
  • Soot sensor Particle sensors, in particular high-voltage particle sensors, which are based on a charge measurement principle, are known, for example, from WO
  • soot sensors in particular soot sensors, at least part of soot particles contained in an exhaust gas is charged.
  • Soot particles are charged, for example, by the soot particles flowing through a corona of a corona discharge at a high voltage electrode.
  • the soot particles may also be charged by contact with ionized air.
  • the air is ionized by the air flowing through the corona of the corona discharge.
  • ionized air adheres to a charged soot particle. It is also possible to directly charge the soot particles via contact with a high voltage electrode.
  • Charge is based on a determination of a charge influence created by charged soot particles on a sensor electrode. This is a measure of the number of charged soot particles. It is also a direct measurement of a current possible by the discharge of charged soot particles from the
  • the outgoing current is a measure of the number of charged soot particles charged soot particles represents a measure of the number of soot particles in the exhaust gas.
  • the soot sensor has a higher sensitivity than conventional ones
  • Soot sensors i. a smaller minimum measurable mass concentration or number concentration of the soot particles per exhaust gas volume.
  • soot sensor is a particle sensor with a
  • High voltage electrode and at least one ground electrode provided, wherein the high voltage electrode is connected via an inlet channel with an open end of the inlet channel, wherein the high voltage electrode is connected via an outlet channel with an open end of the outlet channel, wherein the at least one ground electrode is arranged in the outlet channel, characterized in that the inlet channel extends from the open end of the inlet channel and the outlet channel from the open end of the outlet channel along a common axis towards the high voltage electrode.
  • This particle sensor can perform the measurements particularly reliable.
  • the particle sensor is designed to measure a particle concentration via a current caused by the particles that cause the
  • the inlet channel surrounds the outlet channel (1 16) at least in sections radially. This is a particularly compact design.
  • the inlet channel and the outlet channel are rotationally symmetrical to the common axis. This allows a particularly favorable production in a ceramic injection molding process.
  • the inlet channel and the outlet channel are cylindrical. This allows the use of cylindrical tools.
  • the high voltage electrode is arranged on a base which closes the inlet channel on its side facing away from the open end of the inlet channel in the direction of the common axis, and wherein the base closes the outlet channel on its side facing away from the open end of the outlet channel in the direction of the common axis.
  • the high-voltage electrode is flown in a particularly favorable manner due to a Venturi effect. This is caused by a pressure difference between the open ends, when the open ends protrude into a particle flow, in particular perpendicular to its main flow direction,
  • the base has a passage for a
  • the base has a passage for fresh air.
  • fresh air can be sucked / pumped in, ionized and subsequently a charge current caused thereby can be determined.
  • the inlet channel and the outlet channel form
  • the particle sensor which is connected in a connecting portion of the particle sensor to the base, wherein in the connecting portion at least one channel is arranged, which connects the inlet channel with the outlet channel.
  • the particle sensor is formed of two parts, on the one hand a sensor body with the inlet channel and the outlet channel and on the other hand with the base. This facilitates the production.
  • the channel tapers in the radial direction with respect to the common axis from outside to inside. This improves the energization of the high voltage electrode.
  • the pedestal increases towards the open end of the exhaust duct and radially outwardly from the inside with respect to the common axis, to a plateau on which the high voltage electrode is disposed. This improves the energization of the high voltage electrode.
  • the high voltage electrode is formed as a needle high voltage electrode, by which a corona discharge is generated, wherein the particles are charged directly in the corona discharge, or wherein ions can be generated in air, which adheres to particles. This allows a particularly effective charging of particles.
  • a sensor electrode is arranged, which is designed to have a charge of
  • the high voltage electrode is arranged in a portion of the base which is set back from the plateau in the direction of the common axis. This improves the energization of the
  • At least one heating element at least partially surrounds the inlet channel or the outlet channel. This improves the
  • At least one shield electrode at least partially surrounds the inlet channel or the outlet channel in a region in which the at least one ground electrode or the high voltage electrode extends, wherein the shield electrode is arranged radially between the at least one ground electrode and the high voltage electrode.
  • the shield electrode reduces falsifying influences of the high voltage applied to the high voltage electrode.
  • the outlet channel is radially outwardly surrounded by a ceramic jacket to the common axis, the inlet channel being radially outwardly of the common axis surrounded by a metallic shell, and wherein the inlet channel is radially formed to the common axis between the ceramic jacket and the metallic shell ,
  • the jacket protects the sensor and can form an electrode.
  • the high-voltage electrode extends in the direction of the open end of the outlet channel into a region of the outlet channel in which the at least one ground electrode extends at least in sections in the direction of the common axis. This improves the effectiveness of the
  • the at least one ground electrode is interrupted with respect to the common axis in the circumferential direction in at least a portion of the outlet channel which extends in the direction of the common axis. This makes it possible to arrange supply lines in this area.
  • a supply line for another electrode is arranged, which extends in the direction of the common axis. This reduces the expense of manufacturing, since no additional passage through the body of the particle sensor is necessary to lead the supply line.
  • a first trap electrode pair and a second trap electrode pair are spaced apart in the exhaust passage in the direction of the common axis, the first trap electrode pair being interrupted in at least a first portion of the exhaust passage extends in the direction of the common axis, and the second pair of trap electrodes is interrupted in at least a second portion of the outlet channel, which extends in the direction of the common axis, and wherein a first region of the outlet channel, in which the first trap electrode Pair is disposed, and a second region of the outlet channel, in which the trap electrode pair is arranged, in the circumferential direction with respect to the common axis
  • Ground electrode is guided via the outlet channel, the open end of the outlet channel and the open end of the inlet channel into the inlet channel.
  • the jacket protects the supply line.
  • a deflection electrode is arranged in the outlet channel, wherein at least one high-voltage supply line for the deflection electrode is guided from the high-voltage electrode via the outlet channel to the deflection electrode. As a result, these electrodes are connected to the same line. This reduces the cost of materials.
  • a method of manufacturing a particulate sensor includes the steps
  • Outlet channel for connecting the high voltage electrode to an open end of the outlet channel, wherein the at least one ground electrode in
  • Outlet channel is arranged, wherein the outlet channel extends from the open end of the outlet channel along the common axis in the direction of an end face of the sensor element, wherein the sensor element at least one of the
  • Front side is arranged in the direction of the common axis recessed recess which passes through the sensor element
  • Forming an inlet channel is spaced, wherein the base of the outlet channel and closes the inlet channel. This allows a particularly favorable production.
  • a fastening means between the shell and base is arranged.
  • the base is connected to the shell so that the shell protects the base and the fastener.
  • Ceramic injection molding process formed from a ceramic material, wherein the base and sensor element before a sintering process pairs connected, surrounded by the jacket and then sintered in the sintering process. This additionally facilitates the production.
  • Fig. 2 shows schematically a representation of a soot sensor with a
  • FIG. 3 schematically shows a soot sensor with a corona electrode
  • Fig. 5 shows schematically a soot sensor with a smaller sized
  • FIG. 6 shows schematically a mounting of a sensor element in a protective tube
  • FIG. 7 shows schematically a soot sensor with a double-walled protective tube
  • FIG. 8 shows schematically a representation of a first air duct into the protective tube
  • FIGS. 12 and 13 schematically variants for passages of a soot sensor
  • FIGS. 14 and 15 schematically variants of a heating element for the soot sensor
  • FIGS. 16 to 18 schematically variants for arrangements of supply lines for electrodes of the soot sensor
  • FIG. 1 schematically shows parts of a soot sensor 100.
  • the soot sensor 100 includes a sensor element 102.
  • the sensor element 102 is cylindrical in the example.
  • the sensor element 102 is made in the example of a ceramic material, such as forsterite (Mg2Si04), since this material has a thermal expansion coefficient of about 1 1 to 12 ppm / K and thus is very close to a thermal expansion coefficient of ferritic steel.
  • Mg2Si04 forsterite
  • the soot sensor 100 includes a protective tube 104.
  • the protective tube 104 is cylindrical in the example.
  • the protective tube 104 is in the example of ferritic steel. This facilitates a fluid connection between the protective tube 104 and the sensor element 102, for example with a ceramic adhesive or active solder.
  • the protective tube 104 surrounds the sensor element 102 at least partially.
  • the protective tube 104 thus forms a metallic housing for the sensor element 102.
  • the protective tube 104 provides an electrical connection 106 for connecting the protective tube 104 to ground.
  • a diameter 108 of the sensor element 102 is smaller than a diameter 110 of the protective tube 104.
  • the sensor element 102 and the protective tube 104 are arranged symmetrically with respect to a common cylinder axis 12.
  • the protective tube 104 is formed as a hollow cylinder.
  • the sensor element 102 is designed as a hollow cylinder.
  • the protective tube 104 partially receives the sensor element 102 in its interior.
  • the sensor element 102 has an outer diameter 108.
  • the protective tube 104 has a
  • Inner diameter 1 10 which is smaller than the outer diameter 108. Due to the different diameter 108, 1 10 and the symmetrical arrangement with respect to the common cylinder axis 1 12 creates an inlet channel 1 14 extending inside the protective tube 104 along the common cylinder axis 1 12, and has a circular cross-section when the
  • Sensor element 102 is disposed in the protective tube 104.
  • the Intake passage 1 14 may flow exhaust gas into the interior of the protective tube 104.
  • the protective tube 104 protects the sensor element 102 at least partially against direct exhaust gas contact, and allows a uniform flow of the exhaust gas on the sensor element 102.
  • an outlet channel 1 16 is provided by the exhaust gas flowing through the inlet channel 1 14 again can flow out.
  • the outlet channel 1 16 extends in the sensor element 102 along the common cylinder axis 1 12.
  • Outlet channel 1 16 is at least partially cylindrical and extends symmetrically with respect to the common cylinder axis 1 12.
  • An open end 1 18 of the intake passage 1 14 is disposed along the common cylinder axis 1 12 on the same side of the sensor element 102 as an open end 120 of the intake passage 1 16.
  • Incoming exhaust gas is introduced at one of the open ends 1 18, 120 in the direction of common cylinder axis 1 12 opposite end of the sensor element 102 deflected to then flow through the outlet channel 1 16. Details are described below.
  • the sensor element 102 extends beyond the common cylinder axis 1 12 seen on the side of the open ends 1 18, 120, the protective tube 104th
  • the soot sensor 100 is preferably arranged such that the common cylinder axis 1 12 runs perpendicular to a main flow direction 122 of the exhaust gas, wherein the side of the open ends 1 18, 120 faces an exhaust gas flow along the main flow direction 122.
  • fresh air in a flow direction 124 may be provided by the fresh air preferably parallel to the common cylinder axis 1 12 flows to the soot sensor 100.
  • the following figures describe schematic representations of such rotationally symmetrical soot particle sensors. It can also be provided other geometric shapes, such as oval cross-sections.
  • the open ends 1 18, 120 may also be arranged in a cross-sectional plane, as shown in the following example.
  • FIG. 2 schematically shows a representation of a soot sensor 100 with a high-voltage electrode 202.
  • the high-voltage electrode 202 is supplied via a supply line 204 from a high-voltage generator 206
  • the high-voltage electrode 202 is arranged on a base 208 opposite the open ends 1 18, 120 along the common cylinder axis 1 12 side of the sensor element 102.
  • High voltage electrode 202 is preferably cylindrical in shape and extends symmetrically along the common cylinder axis.
  • High voltage electrode 202 projects beyond the base 208 on its side facing the open ends 1 18, 120.
  • the base 208 closes the
  • Outlet channel 1 16 on its the open end 120 along the common cylinder axis 1 12 opposite side.
  • a hollow cylindrical mass electrode 210 is arranged, which extends symmetrically along the common cylindrical axis 1 12.
  • the ground electrode 210 is connectable via a ground line 212 to ground.
  • the supply line 204 is through the base 208 of the
  • High voltage electrode 202 led to the high voltage generator 206.
  • the ground line 212 is guided by a jacket of the sensor element 202 from the ground electrode 210 to ground.
  • High voltage generator 206 and ground are not parts of the soot sensor 100 in the example
  • High voltage generator 206 and ground are connected via corresponding contacts on the soot sensor 100 with this.
  • the high voltage generator 206 may optionally also be part of the soot sensor 100.
  • Exhaust gas preferably flows along the sensor element 102 in the direction of the common cylinder axis 1 12 to at least one inlet 214 via the open end 1 18 of the inlet channel 1 14.
  • FIG. 2 shows two inlets 214 which form the channel 1 14 on the open ends 1 18, 120 along the common cylinder axis 1 12 opposite side of
  • Sensor element 102 with the outlet channel 1 16 connect.
  • the at least one inlet 214 is guided by the sensor element 102 substantially perpendicular to the common cylinder axis 1 12.
  • the at least one inlet 1 14 is arranged in a plane perpendicular to the common cylinder axis 1 12, in which a cross-sectional area of the high-voltage electrode 202 is located.
  • the exhaust gas contains particles 216, which flow through the at least one inlet 214 with an exhaust gas flow into the interior of the sensor element 102.
  • the particles 216 flow past the high voltage electrode 202 through the
  • the particles 216 flow through the ground electrode 210.
  • the ground electrode 210 extends along the common cylinder axis 1 12 within the exhaust port 1 16 at least partially. At least part of the particles 216 are electrically charged, for example, by touching the high voltage electrode 202. Electrically charged particles 216 flow due to their electrical charge at least partially to the ground electrode 210. Thus, a current between the high voltage electrode 202 and the
  • Mass electrode 210 generates. This is through suitable measuring devices
  • the base 208 and the sensor element 102 are connected to each other at the open ends 1 18, 120 opposite side of the sensor element 102.
  • a connecting portion 218 is formed in its outer region with respect to the common cylinder axis 1 12 circular.
  • the sensor element 102 has a corresponding shape of the jacket of the sensor element 102 on its front side facing the base 208.
  • FIG. 3 schematically shows a soot sensor 100 having a corona electrode 302 and a corona ground electrode 304, which is connected to the open end 120 of the outlet channel 1 16 along the common cylinder axis 1 12
  • the corona ground electrode is preferably formed as a hollow cylinder and extends in sections along the common cylinder axis 1 to this symmetrically.
  • Ground electrode 210 is not provided in contrast to the example of Figure 2.
  • the corona ground electrode 304 is connectable via the ground line 212 to ground.
  • the one trap electrode 306 can be contacted via a trap electrode line, which is guided through the sensor element 302.
  • the optional sensor electrode 308 can be contacted by a sensor electrode line 312, which is guided through the sensor element 12.
  • the sensor electrode 308 extends in the interior of the outlet channel 1 16 in the direction of the common cylinder axis 212 in sections and is formed as a hollow cylinder.
  • the trap electrode 306 extends in the direction of the common
  • Cylinder axis 1 12 sections on the inside of the inlet channel 1 16.
  • the trap electrode 306 is preferably in the form of a portion of a
  • ground electrode portion 314 is disposed inside the exhaust passage 16 1.
  • the ground electrode portion 314 is preferably shaped like the trap electrode 306.
  • a ground electrode lead 316 leads to contact of the ground electrode portion 314 with ground through the sensor element 102.
  • This soot sensor 100 corresponds to the structure of
  • the currents are also as there
  • Exhaust gas flowing into the sensor element 102 is guided past the corona electrode 302 via the at least one inlet 214. There, the particles 216 are at least partially ionized. In addition, air present in the exhaust gas is at least partially ionized by the flow past the corona electrode 202.
  • the trap electrode 306 and the ground electrode portion 314 trap ions from passing exhaust gas which does not adhere to the soot particles 216. A charge measurement on the soot particles takes place either by means of charge influence on the sensor electrode 308 or according to the "escaping current" principle.
  • FIG. 4 schematically shows a soot sensor 100 which, with the exception of the differences described below, agrees with the soot sensor 100 from FIG.
  • the pairs of electrodes 402, 404, such as the trap electrode 306 and the ground electrode section 314, are arranged in the sensor element and each have the trap electrode line 310 and the
  • Ground electrode line 316 corresponding connections for contacting.
  • the first pair of electrodes 402 and the second pair of electrodes 404 are preferably arranged in the form of cylinder jacket sections which extend offset relative to one another along the jacket circumference.
  • the two electrodes of the first pair of electrodes 402 are relative to each other
  • the two electrodes of the second pair of electrodes 404 are axially symmetrical with respect to the common cylinder axis 1 12.
  • the first electrode pair 402 extends along the circumference of the shell on the jacket of the cylinder along the circumference at least partially in another
  • Electrode pairs 402, 404 arranged such that the first electrode pair 402 extends at least over the entire region of the shell circumference over which the second electrode pair 402 does not extend. In this case, the two pairs of electrodes 402, 404 along the common cylinder axis 1 12 spaced apart.
  • Particles 216 that flow into the sensor element 102 with exhaust gas are at least partially charged as described. Charged particles 216 then fly to one of the two ground electrodes of the first electrode pair 402 or the second pair of electrodes 404, where they generate a current that can be used as a measure of the soot concentration.
  • the electrodes opposite the ground electrodes of the electrode pairs 402, 404 are
  • the charged particles 216 are additionally deflected to increase the number of charged particles reaching the ground electrodes. This increases trapping efficiency.
  • FIG. 5 schematically shows a soot particle sensor 100 which corresponds to the soot particle sensor 100 described in FIG. 2 except for the following difference.
  • the high voltage electrode 202 in the example of Figure 1 is considerably smaller in dimension than its outer dimension High voltage electrode 202 of this embodiment of the soot sensor. More specifically, the high voltage electrode 202 of this embodiment is cylindrically structured and has a larger cylinder diameter than the high voltage electrode 202 described in FIG.
  • High voltage electrode 202 from a ceramic cylinder, which is a part of the base 208, and in the sensor element 102, i. protrudes into the outlet channel 1 16, without touching it.
  • the ceramic cylinder is coated with an electrically conductive layer 502, which is the high voltage electrode 202.
  • the particles 216 are conducted past the conductive layer 502 through the inlet 214.
  • the particles 216 move in an annular channel between the conductive layer 502 and the inner shell of the inlet channel 1 16.
  • the conductive layer 502 extends in the direction of the common cylinder axis 1 12 toward the open end 1 18 of the outlet channel 1 16 out in that the electrically conductive layer 502 penetrates into the region of the outlet channel 1 16 surrounded by the ground electrode 210.
  • FIG. 6 schematically shows an attachment of the ceramic sensor element 102 into the protective tube 104.
  • a single-walled protective tube 104 is used in this case.
  • the sensor element 102 is designed as a ceramic tube, which serves as an inner protective tube and generates a venturi effect with the exhaust gas entering the sensor element 102.
  • the exhaust gas flows between the protective tube 104 and an outer wall of the sensor element 102 in the inlet channel 1 14th
  • the protective tube 104 is connected to the sensor element 102 via a fastening means 602, for example a ceramic adhesive or an active solder.
  • the ceramic adhesive or Aktivlot is particularly suitable, a metallic protective tube 104 with a ceramic sensor element 102 to connect.
  • the attachment means 602 is disposed in the region of the base 208.
  • fixation 604 is interrupted at least in sections so as to admit exhaust gas into the inlet channel 14.
  • the fastening means 602 preferably completely surrounds the base 208 or the sensor element 102 and seals the inlet channel 14 on its side facing away from the open end 1 18 from the surroundings of
  • FIG. 7 schematically shows a double-walled protective tube 104, in which exhaust gas is first guided between the two walls of the protective tube 104 before it flows into the sensor element 102.
  • a first wall 702 of the protective tube 104 corresponds to the protective tube 104 described above.
  • a second wall 704 of the protective tube 104 is formed such that the second wall 704 the
  • Fixing points 706 or a seam circulating on the inside of the second wall 704 on an end face 708 of the sensor element 102 serve for fixing purposes.
  • the first wall 702 is connected to the base 208 and the second wall 704 via the attachment means 602 and the fixation 604. Exhaust gas can flow through the fixation 604, the attachment means 602 seals the double-walled protective tube on the side of the double-walled protective tube, which faces away from the open end 1 18 of the inlet channel 1 14.
  • FIG. 8 schematically shows a representation of a first air duct into the sensor element 102.
  • the air duct can be provided in each of the examples described above instead of the air duct provided there by means of the at least one inlet 214.
  • the difference with the at least one inlet 214 of the previously described examples is that the geometry of the passageway through the sensor element 102 is as follows different.
  • the implementation described above by the sensor element 102 is formed with respect to the common cylinder axis 1 12 radially symmetrical.
  • the bushing in the example of FIG. 8 tapers along the transverse axis in its course from one to the other
  • the passageway extends in the connection portion 218 such that at least a portion of the passageway is formed by a portion of the pedestal 208.
  • a section of the base 208 that rises steadily from the outer circumference of the base 208 to the platform 220 of the base preferably forms this boundary of the passage.
  • the passage on the side facing the base 208 of the sensor element 102 is parallel to a plane extending perpendicular to the common cylindrical axis 1 12.
  • FIG. 9 shows an example which corresponds to the example of FIG. 8 except for the following difference.
  • the corona electrode 302 is in FIG. 9
  • FIG. 10 schematically shows a further variant of the soot sensor 100, in which an electrode is arranged as described in the example for FIG. 5 and is supplied with exhaust gas and particles via at least one inlet 214, which has the properties described in FIG.
  • FIG. 11 shows the same arrangement with respect to the electrode as in the example of FIG.
  • the onflow of the high-voltage electrode 202 is further improved and the deposition of soot particles in the interior of the sensor is reduced. This reduces the risk of a short circuit between the electrodes.
  • the described high voltage electrode 202 is for example a
  • Needle electrode The structure of the described sensor element 102 is preferably rotationally symmetrical. Preferably, the base 208 and the sensor element 102 can be plugged together. The resulting inlets 214 are described in more detail below with reference to FIGS 12 and 13.
  • FIG. 12 schematically shows a first view of the sensor element 102, which is plugged onto the base 208.
  • Figure 12 three of the particle passages are shown.
  • the passages are spaced from each other and surround the cylinder shell in a regular arrangement in the connecting portion 218th
  • the sensor element 102 and the base 208 preferably abut one another at an outer circumferential edge 1202.
  • the outer circumferential edge 1202 is arranged in a plane perpendicular to the common cylinder axis 12.
  • the passages are channels 1204 having a bottom 1206 and a roof 1208.
  • the roof 1208 is preferably an arcuate recess in the
  • the bottom 1206 is preferably a plane which rises from the outer abutment edge 1202 to the plateau 220.
  • FIG. 13 shows a further exemplary embodiment of the outer abutment edge 1202.
  • the sensor element 102 is formed as in the example of FIG.
  • the base 208 is provided with teeth 1302, which rise in the direction of the common cylinder axis 1 12 from the base 208 and carry the bottom 1206.
  • Geometry of the sensor elements 102 in the region of the connecting portion 218th are formed, the sensor element 102 in a plug connection
  • the internal dimensions of the plug elements correspond to the outer dimensions of the sensor element 102 in this region such that perpendicular to the common cylinder axis 1 12 a form-fitting and / or along the common cylinder axis 1 12 creates a positive connection.
  • the teeth 1302 and the joints 1304 are formed as rectangular teeth. In both cases, a contact surface between the two elements starting from the outer edge 1202 to the plateau 220 is increasing. This results in a tapered channel shape. This distracts the teeth 1302 and the joints 1304 .
  • Figure 14 shows schematically a soot sensor 100, in which a heating element 1402 is arranged.
  • the soot sensor 100 may be one of the soot sensors 100 described above.
  • the course of the heating element along the common cylinder axis 1 12 is spirally on the inner surface of the
  • Heater lines 1404 and 1406 connect the heater 1402 to a heater voltage source 1408.
  • FIG. 15 describes an arrangement such as FIG. 14.
  • the heating element 1402 is arranged on an outer jacket of the sensor element 102 and runs in a spiral along the common cylinder axis 1 12.
  • Figure 16 shows schematically an arrangement of leads to the electrodes in a soot sensor 100, of the kind previously described.
  • the supply line 204 is along the common Cylinder axis 1 12 arranged.
  • the corona ground electrode 304 and the ground electrode section 314 are common in the example
  • Voltage supply 1602 connected in the interior of the sensor element 102 along a surface line of the inner shell of the sensor element 102 from the corona mass electrode 304 to the ground electrode section 314 and from there to the open end 120 of the outlet channel 1 16, preferably parallel to the common cylinder axis 1 12, to be led.
  • Ground electrode 1602 is guided via an end face of the sensor element 102 to the outer jacket of the sensor element 102 and from there along a generatrix of the sensor element 102, preferably parallel to the common
  • Cylinder axis 1 12 led back to the base 208.
  • the common electrode 1602 thus runs at least partially in the interior of the inlet channel 1 14.
  • the sensor electrode 308 is in the area where the common electrode 1602 passes the portion where the sensor electrode 312 in FIG.
  • Disruption of the sensor electrode 308 is formed such that the common electrode 1602 extends without contact to the sensor electrode 308 along the jacket of the sensor element 102.
  • the trap electrode 306 is preferably connected to the supply line 204 through the trap electrode line 310.
  • the trap electrode line 310 along a lateral surface in the interior of the
  • the trap electrode line 310 extends parallel to the common cylinder axis 1 12.
  • the trap electrode line 310 is preferably continued on the plateau 220 of the base 208, up to the corona electrode 302.
  • the same connection to the connection line 204 is used, which also for the corona electrode 302 is used.
  • the corona ground electrode 304 is interrupted in a region where the trap electrode line 310 is passed through the portion where the corona ground electrode 304 is disposed on the inside of the sensor element 102.
  • the area is formed so that the corona ground electrode 304 and the trap electrode line 310 do not touch each other.
  • the sensor electrode 308 can be contacted via the sensor electrode line 312.
  • the sensor electrode line 312 is in the interior of the sensor element 102, in particular along the inner shell of the sensor element 102, preferably in the direction of the common cylinder axis 1 12 of the
  • Sensor electrode line 1 12 is guided over the end face of the sensor element 102 to the outer jacket of the sensor element 102.
  • the sensor electrode line 312 is guided along the outer jacket of the sensor element 102, preferably parallel to the common cylinder axis 1 12 to the base 208.
  • the common ground electrode 1602 and the sensor electrode line 312 are arranged in different regions of the sensor element 1 12 and do not touch.
  • the common ground electrode 1602 and the trap electrode line 310 are preferably arranged on mutually opposite sections of the sensor element 102. This is the distance between them
  • FIG. 17 and FIG. 18 schematically illustrate an electromagnetic shield for the sensor electrode line 312.
  • This shield may additionally be provided in the above-mentioned soot sensors 100 to provide a shield
  • the shielding is achieved by a large-area electrode 1702 extending over a portion of the inner shell of the sensor element 102 extending between the sensor electrode line 312 and the trap electrode 306 and the trap electrode line 310 at least in the portion where the sensor electrode line 312 and the trap electrode 306 and the trap
  • the large-area electrode 1702 is formed as a hollow cylinder, which lines the inner surface of the sensor element 102 in this area.
  • recesses may be provided in the large-area electrode 1702.
  • the trap electrode 306 and the trap electrode line 310 may be separated from the large-area electrode 1702 by an insulating layer on its side facing the large-area electrode 1702.
  • the large-area electrode is a shield grounded by means of a corresponding feed line 1704.
  • connecting elements 1706 can be arranged, by means of which the electrically conductive connection is maintained in this area.
  • FIG. 18 schematically shows an arrangement of the large area electrode 1704 in a planar area on the outer jacket of the sensor element 102.
  • an electrically insulating layer is provided between the large area electrode 1702 and the sensor electrode line 312.
  • a large-area electrode extends with respect to the trap electrode line 310 and the trap
  • Electrode 306 in a portion of that in the example of Figure 17
  • a layer stack consisting of the shielding, the insulation and the respective supply line can be produced, for example, via an in-mold labeling method.
  • the leads can be guided over connecting edges between the two ceramic parts and connected to the connection points 1706.
  • the joints 1706 are preferably located at the areas shown in FIG. 19 between the channels 1204 at the outer abutment edge 1202 and are in the area where the sensor element 102 and the pedestal 208 contact each other.
  • Figure 20 shows details of the electrical connection to one of
  • a first supply line 2002 is provided with a second supply line Feed line 2004, preferably at the outer abutment edge 1202, directly connected by the first lead 1202 is guided to the outer abutment edge 1202 and the second lead 1204 is guided to the outer abutment edge 1202.
  • Sensor element 102 and the base 208 made the electrically conductive connection.
  • a third lead 2006 may be disposed on the sensor element 102 which is not fully guided to the outer abutment edge 1202.
  • a fourth supply line 2008 which does not lead completely to the outer abutting edge 1202, can be arranged on the base 208.
  • the electrical connection 1706 for example, with the third electrode 2006 and the fourth electrode 2008 is overlapped and / or glued to the outer abutment edge 1202.
  • a conductive paste is attached, which is preferably sinterable.
  • the electrically conductive, preferably sinterable, paste is in contact with the trap electrode line 310 on the sensor element 102 and on the base 208.
  • FIG. 22 schematically describes steps of a method for producing a soot sensor 100 of the type described above.
  • the ceramic of the sensor element 102 is cast in.
  • the direction of flow of the mass, i. the ceramic is chosen so that it from the later open end 120, 1 18 to the opposite end, i. to the later having the channels side of the sensor element 102 parallel to the common cylinder axis 1 12 extends.
  • the base 208 and in the example a cylindrical body extending in the direction of the common axis 1 12 from the base 208 to the plateau 220, formed.
  • a functional layer package is arranged, in which the functional layer package is inserted into a CIM tool and over-injected in the region of the cylinder.
  • Function layer packages deducted, so that a functional layer 2204 remains on the base.
  • This functional layer represents the high-voltage electrode 202 in the completed soot sensor 100.
  • the method described can be applied to the particle sensors described above, in particular to soot sensors and other comparable sensors.

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
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  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

L'invention concerne un capteur de particules (100) comprenant une électrode haute tension (202, 302) et au moins une électrode de masse (210, 304, 308, 314), l'électrode haute tension (202, 302) étant reliée par un canal d'admission (114) à une extrémité ouverte (118) de ce canal d'admission (114), l'électrode haute tension (202, 302) étant en outre reliée par un canal de sortie (116) à une extrémité ouverte (120) de ce canal de sortie (116), l'électrode ou les électrodes de masse (210, 304, 308, 314) étant agencée(s) dans le canal de sortie (116). Cette invention est caractérisée en ce que le canal d'admission (114) s'étend à partir de l'extrémité ouverte (118) du canal d'admission (14) et le canal de sortie (116) s'étend à partir de l'extrémité ouverte (120) du canal de sortie (116) le long d'un axe commun (112) en direction de l'électrode haute tension (202, 302). Cette invention concerne un procédé pour produire un tel capteur de particules (100).
PCT/EP2018/061910 2017-05-23 2018-05-08 Capteur de particules WO2018215203A1 (fr)

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KR1020197034079A KR20200011422A (ko) 2017-05-23 2018-05-08 입자 센서
EP18723498.4A EP3631406A1 (fr) 2017-05-23 2018-05-08 Capteur de particules
CN201880033979.9A CN110678728A (zh) 2017-05-23 2018-05-08 颗粒传感器

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DE102017208773.0 2017-05-23
DE102017208773.0A DE102017208773A1 (de) 2017-05-23 2017-05-23 Partikelsensor

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WO (1) WO2018215203A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019223934A1 (fr) * 2018-05-24 2019-11-28 Robert Bosch Gmbh Capteur de gaz présentant une surface de déviation côté boîtier de base pour la réduction de l'écoulement du fluide

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DE102008041038A1 (de) * 2008-08-06 2010-02-11 Robert Bosch Gmbh Gassensor
WO2012089922A1 (fr) 2010-12-31 2012-07-05 Pegasor Oy Unité de mesure de particules
US20120312074A1 (en) * 2011-05-26 2012-12-13 Emisense Technologies, Llc Agglomeration and charge loss sensor for measuring particulate matter
WO2013125181A1 (fr) 2012-02-21 2013-08-29 日本特殊陶業株式会社 Détecteur de microparticules
US20150192545A1 (en) * 2014-01-08 2015-07-09 Ngk Spark Plug Co., Ltd. Particulate sensor

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JPS571952A (en) * 1980-06-06 1982-01-07 Hitachi Ltd Particle densitometer
EP2370802B1 (fr) * 2008-11-25 2017-07-26 Koninklijke Philips N.V. Capteur destiné à détecter des particules en suspension dans l'air
JP2012058015A (ja) * 2010-09-07 2012-03-22 Ngk Insulators Ltd 粒子状物質検出装置
DE102014212858A1 (de) * 2014-07-02 2016-01-07 Robert Bosch Gmbh Sensor zur Detektion von Teilchen

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Publication number Priority date Publication date Assignee Title
DE102008041038A1 (de) * 2008-08-06 2010-02-11 Robert Bosch Gmbh Gassensor
WO2012089922A1 (fr) 2010-12-31 2012-07-05 Pegasor Oy Unité de mesure de particules
US20120312074A1 (en) * 2011-05-26 2012-12-13 Emisense Technologies, Llc Agglomeration and charge loss sensor for measuring particulate matter
WO2013125181A1 (fr) 2012-02-21 2013-08-29 日本特殊陶業株式会社 Détecteur de microparticules
US20150192545A1 (en) * 2014-01-08 2015-07-09 Ngk Spark Plug Co., Ltd. Particulate sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019223934A1 (fr) * 2018-05-24 2019-11-28 Robert Bosch Gmbh Capteur de gaz présentant une surface de déviation côté boîtier de base pour la réduction de l'écoulement du fluide

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KR20200011422A (ko) 2020-02-03
DE102017208773A1 (de) 2018-11-29
EP3631406A1 (fr) 2020-04-08
CN110678728A (zh) 2020-01-10

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