WO2015025456A1 - 微粒子検知システム - Google Patents
微粒子検知システム Download PDFInfo
- Publication number
- WO2015025456A1 WO2015025456A1 PCT/JP2014/003584 JP2014003584W WO2015025456A1 WO 2015025456 A1 WO2015025456 A1 WO 2015025456A1 JP 2014003584 W JP2014003584 W JP 2014003584W WO 2015025456 A1 WO2015025456 A1 WO 2015025456A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ion source
- heater
- circuit
- current
- fine particles
- Prior art date
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 105
- 239000011859 microparticle Substances 0.000 title abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 13
- 150000002500 ions Chemical class 0.000 claims description 138
- 239000010419 fine particle Substances 0.000 claims description 95
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000003570 air Substances 0.000 description 50
- 238000000034 method Methods 0.000 description 29
- 239000013256 coordination polymer Substances 0.000 description 13
- 239000004071 soot Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000008186 active pharmaceutical agent Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000013022 venting Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
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 fine particle detection system that detects the amount of fine particles in a gas to be measured flowing in a ventilation pipe.
- the exhaust gas may contain particulates such as soot.
- Such exhaust gas containing fine particles is purified by collecting the fine particles with a filter.
- unpurified exhaust gas is directly discharged downstream of the filter. Therefore, there is a need for a particulate detection system that can directly detect the amount of particulates in the exhaust gas and detect the amount of particulates in the exhaust gas in order to detect filter malfunctions.
- Patent Document 1 discloses a particle measuring method and apparatus.
- clean gas is ionized by corona discharge, and the gas containing the ionized positive ion particles is mixed with the exhaust gas containing the fine particles taken into the channel from the exhaust pipe to charge the fine particles. And then discharged into the exhaust pipe.
- concentration of fine particles is disclosed.
- Patent Document 2 discloses a specific configuration of a fine particle sensor using ions generated by such corona discharge.
- a constant current circuit is generally used as a power supply circuit for supplying power for corona discharge, and a constant current of, for example, about 5 ⁇ A is applied during corona discharge. Supply to the electrode for discharge.
- the current (for example, 5 ⁇ A) controlled by the above-described constant current circuit needs to be constant and stable.
- the current supplied for the corona discharge is often not stable. In such a state, since the amount of ions generated by corona discharge varies, it is difficult to accurately detect the amount of fine particles even if the amount of fine particles is detected while the current is unstable. . *
- the present invention has been made in view of such problems, and provides a particle detection system that can prevent detection in a state where detection accuracy is reduced and can accurately detect the amount of particles. It is.
- One aspect thereof is a fine particle detection system for detecting the amount of fine particles in a gas to be measured flowing through a vent pipe, a detection unit mounted on the vent pipe, a drive circuit for driving the detection unit, and the above
- a control unit that controls the drive circuit and detects the amount of the fine particles, and the detection unit mixes an ion source that generates ions by air discharge and a part of the gas to be measured with the ions.
- a fine particle charging unit that makes the fine particles in the gas to be measured charged fine particles to which the ions are attached, and the driving circuit has an air discharge current supplied to the ion source having a predetermined target current.
- An ion source driving circuit that performs constant current control so that the control unit has a detection circuit that detects a signal corresponding to the amount of the charged fine particles, and starts the operation of the ion source by the ion source driving circuit.
- Current convergence determining means for determining whether or not the air discharge current flowing through the path has converged within a predetermined allowable range including the target current; and after the air discharge current has converged within the allowable range
- a detection start means for starting detection of the amount of the fine particles using the signal.
- the ion source drive circuit performs constant current control so that the air discharge current supplied to the ion source becomes a predetermined target current.
- the air discharge current is not stable, and condensed water and soot are attached around the ion source, and the ion source
- the air discharge current may not easily converge to the target current due to a decrease in insulation.
- the amount of generated ions varies, so a signal corresponding to the amount of charged fine particles detected by the detection circuit (for example, depending on the amount of charged fine particles). It is difficult to accurately detect the amount of fine particles using a flowing current.
- this particulate detection system after the operation of the ion source is started, the amount of particulates is detected using a signal after the air discharge current supplied to the ion source converges within a predetermined allowable range. Has started.
- the detection of the amount of fine particles using the signal detected by the detection circuit can be started in a state where the air discharge current is stable, the amount of generated ions can be stabilized and the amount of fine particles can be detected accurately. it can.
- the signal corresponding to the amount of charged fine particles detected by the detection circuit includes, for example, a current corresponding to the amount of charged fine particles.
- a predetermined conversion formula or a predetermined reference table is used to convert the detected signal (current) to the amount of fine particles.
- the magnitude of the current detected by the detection circuit itself may be used as a physical quantity corresponding to the amount of fine particles.
- the detection unit includes a heater that heats the ion source
- the drive circuit includes a heater energization circuit that energizes the heater
- the control unit includes the heater
- the particulate detection system may include a heater energization control unit that energizes the heater to the heater energization circuit until the air discharge current converges within the allowable range.
- the heater can remove water droplets such as condensed water and foreign substances such as soot that have adhered to the periphery of the ion source to restore the insulation of the ion source, and the air discharge current can be reduced early. It is possible to shorten the time until the detection of the amount of fine particles can be started by converging within an allowable range.
- the heater energization control unit is configured such that the air discharge current does not converge within the allowable range within a predetermined period after the operation of the ion source is started.
- a fine particle detection system including heater energization starting means for starting energization of the heater in the heater energization circuit is preferable.
- the heater energization circuit starts energizing the heater. Therefore, in this particulate detection system, when the air discharge current converges within the allowable range at the beginning of the operation of the ion source and the detection of the amount of particulates can be started, the heater is not energized. Power consumption due to energization can be reduced.
- the detection unit collects floating ions that have not adhered to the fine particles by mixing with the gas to be measured among the ions, and An auxiliary electrode for assisting collection of the floating ions by the collection electrode, the drive circuit has an auxiliary electrode drive circuit for driving the auxiliary electrode, and the heater is the ion source as well as the ion source.
- a fine particle detection system configured to heat the auxiliary electrode may be used.
- This fine particle detection system has an auxiliary electrode, and the heater heats the auxiliary electrode in addition to the ion source. Thereby, it is possible to recover the deterioration of the insulating property of the auxiliary electrode due to the adhering foreign matter such as condensed water and soot to the auxiliary electrode, and the amount of fine particles can be detected more appropriately.
- the particulate detection system 1 of the present embodiment is mounted on an exhaust pipe EP of an engine ENG (internal combustion engine) mounted on a vehicle AM, and determines the amount of particulate S (soot) in the exhaust gas EG flowing in the exhaust pipe EP. Detect (see FIG. 1).
- the system 1 mainly includes a detection unit 10, a circuit unit 201, and a pressure feed pump 300 that is a compressed air source that generates compressed air AK (see FIG. 2).
- the detection unit 10 is attached to an attachment part EPT in which an attachment opening EPO is perforated in the exhaust pipe EP (venting pipe). A part thereof (in FIG.
- the right side (front end side) of the attachment portion EPT) is disposed in the exhaust pipe EP through the attachment opening EPO, and is in contact with the exhaust gas EG (measured gas).
- the circuit unit 201 is connected to the detection unit 10 via a cable 160 made of a plurality of wiring materials outside the exhaust pipe EP.
- the circuit unit 201 includes a circuit that drives the detection unit 10 and detects a signal current Is described later. *
- the circuit unit 201 includes a measurement control circuit 220 including a signal current detection circuit 230 and a heater energization circuit 226, an ion source power supply circuit 210, and an auxiliary electrode power supply circuit 240.
- the ion source power supply circuit 210 has a first output terminal 211 having a first potential PV1 and a second output terminal 212 having a second potential PV2.
- the second potential PV2 is a positive high potential with respect to the first potential PV1.
- the second output terminal 212 outputs a positive pulse voltage of 1 to 2 kV0-p obtained by half-wave rectifying a sine wave of about 100 kHz with respect to the first potential PV1.
- the ion source power supply circuit 210 constitutes a constant current power supply whose output current is feedback-controlled by a microprocessor 202 described later and whose effective value maintains a predetermined current value (for example, 5 ⁇ A). Further, the microprocessor 202 can detect the magnitude of an output current (a discharge current Id, which will be described later) flowing through the ion source power supply circuit 210 through an isolation amplifier circuit (not shown). *
- the auxiliary electrode power circuit 240 has an auxiliary first output terminal 241 that is electrically connected to the first output terminal 211 and is set to the first potential PV1, and an auxiliary second output terminal 242 that is set to the third potential PV3.
- the third potential PV3 is a positive DC high potential with respect to the first potential PV1, but is lower than the peak potential (1 to 2 kV) of the second potential PV2, for example, DC 100 to 200 V
- the potential is *
- the signal current detection circuit 230 forming a part of the measurement control circuit 220 includes a signal input terminal 231 connected to the first output terminal 211 of the ion source power supply circuit 210 and a ground input terminal 232 connected to the ground potential PVE. Have.
- the signal current detection circuit 230 detects a signal current Is flowing between the signal input terminal 231 and the ground input terminal 232.
- the heater energization circuit 226 is a circuit that energizes a heater 78 (described later) by PWM control to generate heat, and is connected to the first heater connection wiring 169a and the second heater connection wiring 169b of the cable 160, respectively. .
- the first output terminal 211 of the ion source power circuit 210, the auxiliary first output terminal 241 of the auxiliary electrode power circuit 240, and the signal input terminal 231 of the signal current detection circuit 230 are connected to each other.
- the primary iron core 271A of the insulating transformer 270 is electrically connected to the ground potential PVE, and the secondary iron core 271B is electrically connected to the first electric potential PV1 (the first output terminal 211 of the ion source power supply circuit 210).
- the measurement control circuit 220, the ion source power supply circuit 210, and the auxiliary electrode power supply circuit 240 are insulated from each other through the insulating transformer 270.
- the measurement control circuit 220 includes a regulator power source PS.
- the regulator power supply PS is driven by an external battery BT through the power supply wiring BC.
- the measurement control circuit 220 includes a microprocessor 202 and can communicate with a control unit ECU that controls the internal combustion engine via the communication line CC.
- the converted value of the amount of the fine particles S corresponding to can be transmitted to the control unit ECU. *
- the pressure pump 300 takes in the ambient air (air) around itself and pumps clean compressed air AK through an air supply pipe 310 toward an ion source 11 described later.
- a second potential wiring 161 made of copper wire, an auxiliary potential wiring 162, a first heater connection wiring 169a and a second heater connection wiring 169b, and a hollow air pipe 163 made of resin are arranged. Yes. Further, the first potential wiring 165 and the ground potential wiring 167 made of a braided copper fine wire are surrounded around the radial direction by sandwiching an insulating layer (not shown). *
- the circuit unit 201 is connected to the cable 160 (see FIG. 2).
- the second output terminal 212 of the ion source power supply circuit 210 is set to the second potential PV2, and is connected to and connected to the second potential wiring 161.
- the auxiliary second output terminal 242 of the auxiliary electrode power supply circuit 240 is set to the third potential PV3, and is connected to and connected to the auxiliary potential wiring 162.
- the first output terminal 211 of the ion source power supply circuit 210 is set to the first potential PV1, and is connected to and conductive with the first potential wiring 165.
- the ground input terminal 232 of the signal current detection circuit 230 is connected to and connected to the ground potential wiring 167 to be the ground potential PVE.
- the heater energization circuit 226 is connected to and conductive with the first heater connection wiring 169a and the second heater connection wiring 169b.
- the air supply pipe 310 communicates with the air pipe 163 of the cable 160. *
- the detection unit 10 will be described (see FIG. 2). As described above, the detection unit 10 is mounted on the mounting portion EPT having the mounting opening EPO in the exhaust pipe EP (venting pipe) of the engine ENG (internal combustion engine), and contacts the exhaust gas EG (measured gas).
- the detection unit 10 is roughly composed of an ion source 11, a fine particle charging unit 12, a first conduction member 13, a needle electrode body 20, and an auxiliary electrode body 50 in terms of its electrical functions. *
- the first conducting member 13 is made of metal and has a cylindrical shape, and is connected to the first potential wiring 165 on the distal end side of the cable 160 and is electrically connected thereto.
- the distal end side of the second potential wiring 161 of the cable 160 is connected to the needle electrode body 20 in the first conductive member 13.
- the needle-like electrode body 20 is made of a tungsten wire and has a needle-like tip portion 22 whose tip portion is pointed like a needle.
- the needle-shaped tip 22 forms one of two electrodes of the ion source 11 described later. *
- auxiliary electrode body 50 is made of a stainless steel wire, the tip side thereof is bent back in a U-shape, and further has an auxiliary electrode portion 53 that forms an auxiliary electrode described later at the tip portion. Further, the extended portion 51 of the auxiliary electrode body 50 is covered with an auxiliary electrode insulating pipe 79 with a heater (see FIG. 4).
- the auxiliary electrode insulating pipe 79 with a heater includes a cylindrical auxiliary electrode insulating pipe 77 made of an insulating ceramic such as alumina, a heater 78 formed and integrated on the surface, and an insulating ceramic layer 76 covering them. . *
- the auxiliary electrode insulating pipe 79 with a heater has two heater terminals 78a and 78b of the heater 78 exposed on the base end side (lower side in FIG. 4).
- the heater 78 is made of tungsten, extends from the heater terminals 78a and 78b toward the distal end side (upward in FIG. 4), the heater lead portions 78r1 and 78r2, the first heater portion 78h1 located at the distal end portion, and the proximal end thereof. And two heat generating portions of the second heater portion 78h2 located on the side.
- the first heater part 78h1 and the second heater part 78h2 are connected in parallel, and among these, the first heater part 78h1 heats the vicinity of the auxiliary electrode part 53 of the auxiliary electrode body 50 forming the auxiliary electrode.
- the second heater portion 78h2 heats the vicinity of the ion source 11 (a nozzle portion 31 and a needle-like tip portion 22 of the needle-like electrode body 20 described later). That is, the heater 78 heats the ion source 11 and the auxiliary electrode portion 53 (auxiliary electrode) of the auxiliary electrode body 50 by the two first and second heater portions 78h1 and 78h2.
- the first conducting member 13 is conducted to the first output terminal 211 of the ion source power supply circuit 210 through the first potential wiring 165 of the cable 160, and is set to the first potential PV1. Moreover, the 1st conduction
- the circumference of the first conducting member 13 in the radial direction is surrounded by an exterior member 14 that is attached to the exhaust pipe EP and conducts to the exhaust pipe EP.
- the exterior member 14 is connected to the cable 160 and is electrically connected to the ground potential wiring 167 of the cable 160 so as to have a ground potential PVE.
- the first heater connection wiring 169a and the second heater connection wiring 169b of the cable 160 are connected to the heater connection terminals 170a and 170b in the first conduction member 13, respectively.
- the heater connection terminals 170 a and 170 b are connected to the heater terminals 78 a and 78 b of the heater 78 in the first conductive member 13. *
- the air pipe 163 of the cable 160 has an open end in the first conducting member 13. Then, the compressed air AK supplied from the pressure feed pump 300 through the air pipe 310 and the air pipe 163 of the cable 160 is discharged from the air pipe 163, and further, the discharge space DS (described later) on the tip side (right side in FIG. 2). To be pumped. *
- a nozzle portion 31 is fitted on the distal end side (right side in FIG. 2) of the first conducting member 13.
- the nozzle portion 31 has a concave shape whose center is directed to the tip side, and a fine through hole is formed at the center to form a nozzle 31N.
- the nozzle portion 31 is also electrically connected to the first conducting member 13 and is set to the first potential PV1. *
- a discharge space DS is formed inside them.
- the needle-like distal end portion 22 of the needle-like electrode body 20 protrudes, and this needle-like distal end portion 22 is a surface on the base end side of the nozzle portion 31 and faces a concave facing surface 31T. ing. Accordingly, when a high voltage is applied between the needle-shaped tip 22 and the nozzle portion 31 (opposing surface 31T), air discharge occurs, and N 2 , O 2, etc. in the atmosphere are ionized, and positive ions (for example, N 3+ , O 2+, hereinafter also referred to as ions CP).
- the compressed air AK discharged from the air pipe 163 of the cable 160 is also supplied to the discharge space DS.
- the air AR originating from the compressed air AK is ejected from the nozzle 31N of the nozzle portion 31 toward the mixed region MX (described later) on the tip side at a high speed, and the compressed air AK (air AR) ),
- the ions CP are also injected into the mixing region MX.
- the fine particle charging unit 12 is configured on the tip side (right side in FIG. 2) of the nozzle unit 31.
- An intake port 33I (opening toward the downstream side of the exhaust pipe EP) and a discharge port 43O are perforated on the side surface of the fine particle charging unit 12.
- the fine particle charging unit 12 is electrically connected to the nozzle unit 31 and is set to the first potential PV1. *
- the fine particle charging unit 12 is configured such that the inner space is narrowed in a slit shape by the collecting electrode 42 bulging inward, and on the base end side (left side in FIG. 2) from this, A columnar space is formed between the nozzle portion 31 and the nozzle portion 31.
- the above-described cylindrical space is referred to as a cylindrical mixing region MX1.
- the slit-shaped internal space comprised with the collection pole 42 be the slit-shaped mixing area MX2 (refer FIG. 3).
- the cylindrical mixed region MX1 and the slit-shaped mixed region MX2 are collectively referred to as a mixed region MX.
- a cylindrical space is formed on the tip side of the collecting electrode 42, and a discharge path EX communicating with the discharge port 43O is formed.
- a lead-in path HK that communicates from the inlet 33I to the mixing region MX (cylindrical mixing region MX1) is formed on the proximal end side of the collecting electrode 42.
- FIG. 3 schematically shows the electrical function and operation of the detection unit 10 of the system 1 for easy understanding.
- the needle-like electrode body 20 is set to the second potential PV2, which is a positive half-wave rectified pulse voltage of 100 kHz and 1 to 2 kV0-p with respect to the first potential PV1.
- the auxiliary electrode body 50 is set to the third potential PV3 that is a positive DC potential of 100 to 200 V with respect to the first potential PV1.
- the first conducting member 13, the nozzle part 31, and the fine particle charging part 12 are set to the first potential PV1.
- the exterior member 14 is set to the ground potential PVE which is the same as the ground input terminal 232 and the exhaust pipe EP of the signal current detection circuit 230. *
- a positive needle corona PC is generated in which a corona is generated around the needle-like tip 22 serving as the positive electrode.
- N 2 , O 2, etc. in the atmosphere (air) forming the atmosphere is ionized and positive ions CP are generated.
- Part of the generated ions CP is ejected toward the mixing region MX through the nozzle 31N together with the air AR originating from the compressed air AK supplied to the discharge space DS.
- the nozzle portion 31 and the needle-like tip portion 22 that surround the discharge space DS form the ion source 11 that generates ions CP by an air discharge (corona discharge) between them.
- the air AR When the air AR is injected into the mixing region MX (columnar mixing region MX1) through the nozzle 31N of the nozzle portion 31, the pressure in the columnar mixing region MX1 decreases, so that the exhaust gas EG is drawn from the intake port 33I. Through HK, it is taken into the mixing area MX (columnar mixing area MX1, slit-shaped mixing area MX2).
- the intake exhaust gas EGI is mixed with the air AR, and is discharged from the discharge port 43O via the discharge path EX together with the air AR.
- the exhaust gas EG contains fine particles S such as soot
- the fine particles S are also taken into the mixing region MX as shown in FIG.
- the injected air AR contains ions CP.
- the fine particles S such as soot that have been taken in become ions positively charged fine particles SC to which the ions CP adhere, and in this state, the fine particles S pass through the mixing region MX and the discharge path EX and are removed from the discharge port 43O. It is discharged together with the intake / exhaust gas EGI and the air AR.
- the floating ions CPF that have not adhered to the fine particles S receive a repulsive force from the auxiliary electrode portion 53 of the auxiliary electrode body 50 and are set to the first potential PV1. 42 is attached to and captured by each part of the fine particle charging unit 12 that forms 42.
- the discharge current Id is supplied from the second output end 212 of the ion source power supply circuit 210 to the needle-like tip 22 along with the air discharge in the ion source 11.
- most of the discharge current Id flows into the nozzle portion 31 (power reception current Ij).
- the received current Ij flows through the first conduction member 13 and flows into the first output terminal 211 of the ion source power supply circuit 210.
- most of the ions CP generated and ejected from the ion source 11 are collected by the collection electrode 42.
- the power collection current Ijh is slightly smaller than the discharge current Id. This is because, among the ions CP generated by the ion source 11, the discharged ions CPH attached to the charged fine particles SC discharged from the discharge port 43 ⁇ / b> O are also discharged. This is because the current corresponding to the charges of the discharged ions CPH thus discharged does not flow as the power collection current Ijh. Note that the exhaust pipe EP through which the charged fine particles SC circulate is set to the ground potential PVE. *
- the signal current detection circuit 230 has a signal input terminal 231 that conducts to the first output terminal 211 and a ground input terminal 232 that conducts to the ground potential PVE, and detects a current flowing between them.
- the signal current Is flowing from the ground potential PVE to the first output terminal 211 is detected via the signal current detection circuit 230 via the exterior member 14 and the ground potential wiring 167 of the cable 160.
- the magnitude of the signal current Is corresponding to this difference is the amount of charges of the discharged ions CPH discharged and adhered to the discharged charged fine particles SC, and therefore the intake and exhaust. It increases or decreases according to the amount of the fine particles S in the gas EGI and, consequently, the amount of the fine particles S in the exhaust gas EG flowing through the exhaust pipe EP.
- the signal current Is by the signal current detection circuit 230, the amount of the particulate S in the exhaust gas EG corresponding to this can be detected.
- a conversion value of the amount of the fine particles S is obtained from the detected signal current Is by performing conversion using a predetermined reference table.
- the ion source power supply circuit 210 constitutes a constant current power supply, and the discharge current Id (main) supplied from the second output end 212 of the ion source power supply circuit 210 to the needle tip portion 22.
- the constant current controlled discharge current Id needs to be stable.
- the discharge current Id is often not stable.
- the discharge current Id air discharge current flowing through the ion source power supply circuit 210 has a predetermined allowable range IR.
- the system 1 includes a heater 78 that heats the ion source 11 and the auxiliary electrode portion 53 of the auxiliary electrode body 50, and a heater energization circuit 226 that energizes the heater 78. Then, after the ion source 11 starts operating, the heater energization circuit 226 is energized to the heater 78 by PWM control until the discharge current Id converges within the allowable range IR, and the ion source 11 and the auxiliary electrode body. The 50 auxiliary electrode portions 53 are heated. *
- the heater energization circuit 226 is only supplied to the heater energizing circuit 226 only when the discharge current Id does not converge within the allowable range IR within a predetermined period (10 seconds in the present embodiment) after the operation of the ion source 11 is started.
- Energization of the heater 78 is started. Accordingly, at the beginning of the operation of the ion source 11, when the discharge current Id converges within the allowable range IR and the detection of the amount of the fine particles S can be started, the energization to the heater 78 is not started. Thereby, the power consumption by energizing the heater 78 can be reduced.
- step S1 shown in FIG. 6 after the necessary initial settings are made, the ion source power supply circuit 210 starts the operation of the ion source 11. At this time, the microprocessor 202 separately performs constant current control of the discharge current Id. Thereby, corona discharge is started.
- step S22 the value of the convergence counter used for determining whether or not the discharge current Id has converged within the allowable range IR is set to zero.
- step S23 it is determined whether or not 10 msec has elapsed by using a timer that measures 10 msec. If 10 msec has not elapsed (No), this step S23 is repeated. Then, when 10 msec elapses, the determination becomes Yes in step S23, and the process proceeds to step S24. Thereby, the process after step S24 is performed every 10 msec. *
- step S24 the value of the discharge current Id is acquired every 10 msec.
- step S25 the value of the time-up counter is incremented by one. That is, the value of the time-up counter is incremented by 1 every 10 msec.
- step S26 it is determined whether or not the value of the time-up counter has reached 1000 or more, that is, whether or not 10 seconds of a predetermined time has elapsed since the start of this initial convergence determination subroutine. If 10 seconds have not yet elapsed, the result of step S26 is No, and the process proceeds to step S27. *
- step S27 it is determined whether or not the discharge current Id acquired in step S24 is within the allowable range IR. If it is not within the allowable range IR (No), the process returns to step S22, the value of the convergence counter is cleared to 0, and after waiting for 10 msec in step S23, the discharge current Id in step S24 is obtained again. Proceed to On the other hand, if it is determined in step S27 that the discharge current Id is within the allowable range IR (Yes), the process proceeds to step S28, the value of the convergence counter is incremented by 1, and then the process proceeds to step S29. In step S29, it is determined whether or not the value of the convergence counter is 200 or more. When the value of the convergence counter is not 200 or more (No), the process returns to step S23 while maintaining the value of the convergence counter, waits for 10 msec in this step S23, and obtains the discharge current Id in step S24 again. Proceed to *
- step S2A assuming that the discharge current Id has converged within the allowable range IR, the convergence flag is set to 1, and then the initial convergence determination subroutine is terminated.
- step S3 it is determined whether or not the convergence flag is 1, that is, whether or not the discharge current Id has converged within the allowable range IR.
- the convergence flag is 1 and the discharge current Id has converged within the allowable range IR (Yes), that is, when the detection of the amount of the fine particles S can be started from the beginning of the operation of the ion source 11, step Proceeding to S8, detection of the amount of fine particles S using the signal current Is is started.
- the convergence flag is 0 (No) in step S3 that is, if the discharge current Id has not converged within the allowable range IR, the process proceeds to step S4. *
- step S ⁇ b> 4 the heater energization circuit 226 is started to energize the heater 78 by PWM control to heat the ion source 11 and the auxiliary electrode portion 53 of the auxiliary electrode body 50.
- step S5 a convergence determination subroutine shown in FIG. 8 is executed to determine whether or not the discharge current Id has converged within the allowable range IR.
- step S51 shown in FIG. 8 the value of the time-up counter for stopping the determination of the convergence determination subroutine in 3 minutes is set to zero.
- step S52 the value of the convergence counter used for determining whether or not the discharge current Id has converged within the allowable range IR is set to zero.
- step S53 it is determined whether or not 10 msec has elapsed by using a timer that measures 10 msec. If 10 msec has not elapsed (No), this step S53 is repeated. Then, when 10 msec elapses, the determination in Step S53 is Yes, and the process proceeds to Step S54. Thereby, the process after step S54 is performed every 10 msec. *
- step S54 the value of the discharge current Id is acquired every 10 msec.
- step S55 the value of the time-up counter is incremented by one. That is, the value of the time-up counter is incremented by 1 every 10 msec.
- step S56 it is determined whether or not the value of the time-up counter has reached 18000 or more, that is, whether or not 3 minutes (180 seconds) have elapsed since the start of the convergence determination subroutine. to decide. If three minutes have not yet elapsed, the result of step S56 is No, and the process proceeds to step S57. *
- step S57 it is determined whether or not the discharge current Id acquired in step S54 is within the allowable range IR. If it is not within the allowable range IR (No), the process returns to step S52, the value of the convergence counter is cleared to 0, and after waiting for 10 msec in step S53, the discharge current Id in step S54 is obtained again. Proceed to On the other hand, if it is determined in step S57 that the discharge current Id is within the allowable range IR (Yes), the process proceeds to step S58, the value of the convergence counter is incremented by 1, and then the process proceeds to step S59. In step S59, it is determined whether or not the value of the convergence counter is 200 or more. If the value of the convergence counter is not 200 or more (No), the process returns to step S53 while maintaining the value of the convergence counter, waits for 10 msec in step S53, and obtains the discharge current Id in step S54 again. Proceed to
- step S5A assuming that the discharge current Id has converged within the allowable range IR, the convergence flag is set to 1, and then the convergence determination subroutine is terminated.
- step S5B after the convergence flag is set to 0, this convergence determination subroutine is terminated. In this case, the discharge current Id has not converged within the allowable range IR within 3 minutes.
- step S6 it is determined whether or not the convergence flag is 1, that is, whether or not the discharge current Id has converged within the allowable range IR.
- the process proceeds to step S7.
- step S7 the heater energization circuit 226 stops energizing the heater 78. Thereafter, the process proceeds to step S8, and detection of the amount of the fine particles S using the signal current Is is started.
- Step S6 if the convergence flag is 0 in Step S6 (No), that is, if the discharge current Id does not converge within the allowable range IR within 3 minutes in the convergence determination subroutine, the process proceeds to Step S9.
- step S9 the heater energization circuit 226 stops energizing the heater 78.
- step S10 error processing necessary for aborting the process is performed. In this case, the particle detection routine is terminated without performing particle detection.
- the discharge current Id air discharge current supplied to the ion source 11 is determined in advance.
- detection of the amount of fine particles S using the signal current Is is started.
- Step S8 since the detection of the amount of the fine particles S can be started in a state where the discharge current Id is stable, the amount of the generated ions CP is stabilized, and the amount of the fine particles S can be detected with high accuracy.
- the system 1 of the present embodiment includes a heater 78 that heats the ion source 11 and a heater energization circuit 226 that energizes the heater 78. Then, after the ion source 11 starts operating, the heater energization circuit 226 is energized to the heater 78 until the discharge current Id converges within the allowable range IR to heat the ion source 11 (steps S2 to S2). S7).
- water droplets such as condensed water adhering to the periphery of the ion source 11 and foreign matters such as soot can be removed, and the insulation of the ion source 11 can be recovered, and the discharge current Id can be quickly within the allowable range IR.
- the time until the detection of the amount of the fine particles S can be shortened by converging. *
- the heater energization circuit 226 is energized to the heater 78 when the discharge current Id does not converge within the allowable range IR within a predetermined period after the ion source 11 starts operating. Start (steps S2 to S4). Therefore, in this system 1, when the discharge current Id converges within the allowable range IR and the detection of the amount of the fine particles S can be started at the beginning of the operation of the ion source 11, the heater 78 is not energized. Power consumption due to energization to 78 can be reduced. *
- the auxiliary electrode portion 53 at the distal end portion has an auxiliary electrode body 50 that forms an auxiliary electrode
- the heater 78 is an auxiliary electrode of the auxiliary electrode body 50 in addition to the ion source 11.
- the part 53 is heated.
- the signal current Is corresponds to a signal corresponding to the amount of charged fine particles SC in the present invention.
- the signal current detection circuit 230 of the measurement control circuit 220 that detects the signal current Is corresponds to the detection circuit of the present invention, and the signal current detection circuit 230 and the microprocessor 202 correspond to a control unit.
- the ion source power supply circuit 210 corresponds to a drive circuit and an ion source drive circuit, and the auxiliary electrode power supply circuit 240 corresponds to a drive circuit and an auxiliary electrode drive circuit.
- microprocessor 202 executing steps S2 to S7 corresponds to heater energization control means, and among these, the microprocessor 202 executing steps S2 to S4 corresponds to heater energization start means. Further, the microprocessor 202 executing steps S2 to S3 and steps S5 to S6 corresponds to current convergence determination means, and the microprocessor 202 executing step S8 corresponds to detection start means.
- the present invention has been described with reference to the system 1 of the embodiment.
- the present invention is not limited to the above embodiment, and it can be applied without departing from the gist of the present invention.
- the auxiliary electrode insulating pipe 79 with a heater in which the heater 78 is integrally formed is provided on the surface of the auxiliary electrode insulating pipe 77 that covers the periphery of the extending portion 51 of the auxiliary electrode body 50, and this heater is attached.
- the heater 78 of the auxiliary electrode insulating pipe 79 heated the ion source 11 and the auxiliary electrode portion 53 of the auxiliary electrode body 50.
- the form of the heater is not limited to this, and a heater for heating only the ion source 11 may be provided. Moreover, you may provide the two heaters which heat separately the auxiliary electrode part 53 of the ion source 11 and the auxiliary electrode body 50, respectively. Further, it is possible to wait for the discharge current Id to converge within the allowable range IR without heating the ion source 11 or the like by the heater. Further, the initial initial convergence determination (step S2) may be executed after the energization by the heater 78 is started immediately after the operation of the ion source 11 is started. *
- step S7 the heater energization circuit 226 is de-energized to the heater 78.
- the duty ratio of the PWM control is reduced and small power is supplied to the heater 78. Then, slight heat generation may be continued.
- the signal current Is is converted into the amount of the fine particles S using a predetermined reference table.
- the signal current Is may be converted into the amount of the fine particles S using a predetermined conversion formula.
- the magnitude of the signal current Is itself may be used as a physical quantity corresponding to the amount of the fine particles S.
- the needle-like electrode body 20 is arranged in the discharge space DS, but the needle-like tip portion 22 of the needle-like electrode body 20 is arranged so as to face the mixing region MX, and the needle-like tip portion 22 is arranged. And an air discharge may be generated between the inner surface of the fine particle charging unit 12 forming the mixed region MX.
Landscapes
- 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
Description
加えて、イオン源電源回路210の第1出力端211、補助電極電源回路240の補助第1出力端241、及び、信号電流検知回路230の信号入力端231は、互いの接続している。
次いで、本システム1における微粒子Sの検知原理について説明する。図2に示すように、イオン源11における気中放電に伴って、イオン源電源回路210の第2出力端212から、針状先端部22に、放電電流Idが供給される。
一方、この放電電流Idの多くは、ノズル部31に流れ込む(受電電流Ij)。
この受電電流Ijは、第1導通部材13を流れて、イオン源電源回路210の第1出力端211に流入する。
また、イオン源11で生成され、ここから噴射されたイオンCPの多くは捕集極42で捕集される。
捕集極42で捕集された浮遊イオンCPFが有していた電荷に起因する捕集電流Ihも、捕集極42(微粒子帯電部12)に導通する第1導通部材13を通じて、第1出力端211に流れ込む。
つまり、第1導通部材13には、これらの和である受電捕集電流Ijh(=Ij+Ih)が流れる。
ステップS57では、ステップS54で取得した放電電流Idが許容範囲IR内に入っているか否かを判断する。
許容範囲IR内に入っていない場合(No)には、ステップS52に戻り、収束カウンタの値を0にクリアした後、ステップS53で10msecの経過を待って、再度ステップS54の放電電流Idの取得に進む。
一方、ステップS57で、放電電流Idが許容範囲IR内に入っている場合(Yes)は、ステップS58に進み、収束カウンタの値を+1した後、ステップS59に進む。ステップS59では、収束カウンタの値が、200以上になったか否かを判断する。
収束カウンタの値が200以上でない場合(No)には、この収束カウンタの値を維持したまま、ステップS53に戻り、このステップS53で10msecの経過を待って、再度ステップS54の放電電流Idの取得に進む。
ENG エンジン(内燃機関)
EP 排気管(通気管)
EG 排気ガス
EGI 取入排気ガス
S 微粒子
SC 帯電微粒子
CP イオン
CPF 浮遊イオン
CPH 排出イオン
Id 放電電流(気中放電電流)
Is 信号電流
1 微粒子検知システム
10 検知部
11 イオン源
12 微粒子帯電部
20 針状電極体
22 (針状電極体の)針状先端部(イオン源)
31 ノズル部(イオン源)
42 捕集極
50 補助電極体
53 (補助電極体の)補助電極部(補助電極)
78 ヒータ
202 マイクロプロセッサ(制御部)
201 回路部
210 イオン源電源回路(駆動回路,イオン源駆動回路)
220 計測制御回路
226 ヒータ通電回路
230 信号電流検知回路(制御部,検知回路)
240 補助電極電源回路(駆動回路,補助電極駆動回路)
It 目標電流
IR 許容範囲
S2~S4 ヒータ通電開始手段
S2~S7 ヒータ通電制御手段
S2~S3,S5~S6 電流収束判断手段
S8 検知開始手段
Claims (4)
- 通気管内を流通する被測定ガス中の微粒子の量を検知する微粒子検知システムであって、
上記通気管に装着される検知部と、
上記検知部を駆動する駆動回路と、
上記駆動回路を制御し、上記微粒子の量を検知する制御部と、を備え、
上記検知部は、
気中放電でイオンを生成するイオン源と、
上記被測定ガスの一部を上記イオンと混合して、上記被測定ガス中の上記微粒子を上記イオンが付着した帯電微粒子とする微粒子帯電部と、を有し、
上記駆動回路は、
上記イオン源に供給する気中放電電流が、所定の目標電流となるように定電流制御するイオン源駆動回路を有し、
上記制御部は、
上記帯電微粒子の量に応じた信号を検知する検知回路と、
上記イオン源駆動回路による上記イオン源の作動を開始した後、上記イオン源駆動回路が流す上記気中放電電流が、上記目標電流を含む予め定めた許容範囲内に収束したか否かを判断する電流収束判断手段と、
上記気中放電電流が上記許容範囲内に収束した後に、上記信号を用いた上記微粒子の量の検知を開始させる検知開始手段と、を有する
微粒子検知システム。 - 請求項1に記載の微粒子検知システムであって、
前記検知部は、
前記イオン源を加熱するヒータを有し、
前記駆動回路は、
上記ヒータに通電するヒータ通電回路を有し、
前記制御部は、
前記気中放電電流が前記許容範囲内に収束するまで、前記ヒータ通電回路に前記ヒータへの通電を行わせるヒータ通電制御手段を有する
微粒子検知システム。 - 請求項2に記載の微粒子検知システムであって、
前記ヒータ通電制御手段は、
前記イオン源の作動を開始した後の所定期間内に、前記気中放電電流が前記許容範囲内に収束しない場合に、前記ヒータ通電回路に前記ヒータへの通電を開始させるヒータ通電開始手段を含む
微粒子検知システム。 - 請求項2または請求項3に記載の微粒子検知システムであって、
前記検知部は、
前記イオンのうち前記被測定ガスとの混合で前記微粒子に付着しなかった浮遊イオンを捕集する捕集極と、
上記捕集極による上記浮遊イオンの捕集を補助する補助電極と、を有し、
前記駆動回路は、
上記補助電極を駆動する補助電極駆動回路を有し、
前記ヒータは、
前記イオン源のほか上記補助電極を加熱する構成とされてなる微粒子検知システム。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/911,095 US9719907B2 (en) | 2013-08-21 | 2014-07-07 | Particulate detection system |
DE112014003839.3T DE112014003839B4 (de) | 2013-08-21 | 2014-07-07 | Mikropartikeldetektionssystem |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013171120A JP6182018B2 (ja) | 2013-08-21 | 2013-08-21 | 微粒子検知システム |
JP2013-171120 | 2013-08-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015025456A1 true WO2015025456A1 (ja) | 2015-02-26 |
Family
ID=52483255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/003584 WO2015025456A1 (ja) | 2013-08-21 | 2014-07-07 | 微粒子検知システム |
Country Status (4)
Country | Link |
---|---|
US (1) | US9719907B2 (ja) |
JP (1) | JP6182018B2 (ja) |
DE (1) | DE112014003839B4 (ja) |
WO (1) | WO2015025456A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6251515B2 (ja) * | 2013-08-21 | 2017-12-20 | 日本特殊陶業株式会社 | 微粒子検知システム |
DE102013226175A1 (de) * | 2013-12-17 | 2015-07-02 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Betreiben von Abgassensoren |
US10094757B2 (en) * | 2015-10-27 | 2018-10-09 | Ngk Spark Plug Co., Ltd. | Particulate measurement apparatus and particulate measurement system |
CN106323830A (zh) * | 2016-08-15 | 2017-01-11 | 上海领萃环保科技有限公司 | 一种高湿烟气粉尘监测系统及其方法 |
JP6730154B2 (ja) * | 2016-09-28 | 2020-07-29 | 日本特殊陶業株式会社 | 微粒子測定装置および微粒子測定システム |
JP6730155B2 (ja) * | 2016-09-29 | 2020-07-29 | 日本特殊陶業株式会社 | 微粒子測定装置および微粒子測定システム |
JP7113598B2 (ja) | 2017-07-14 | 2022-08-05 | 株式会社Soken | パティキュレートフィルタの故障検出装置及び故障検出方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59196453A (ja) * | 1983-04-21 | 1984-11-07 | Nippon Denso Co Ltd | パテイキユレ−ト検出素子 |
JP2011033577A (ja) * | 2009-08-05 | 2011-02-17 | Ngk Spark Plug Co Ltd | 微粒子センサ |
JP2011513742A (ja) * | 2008-03-04 | 2011-04-28 | ぺガソー オーワイ | 粒子測定方法及び装置 |
WO2012114518A1 (ja) * | 2011-02-25 | 2012-08-30 | トヨタ自動車株式会社 | 粒子状物質検出センサの異常判定装置 |
JP2012194077A (ja) * | 2011-03-17 | 2012-10-11 | Ngk Spark Plug Co Ltd | 微粒子センサ |
JP2012237641A (ja) * | 2011-05-11 | 2012-12-06 | Ngk Spark Plug Co Ltd | 微粒子検知システム |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4656832A (en) | 1982-09-30 | 1987-04-14 | Nippondenso Co., Ltd. | Detector for particulate density and filter with detector for particulate density |
US6016688A (en) * | 1998-05-14 | 2000-01-25 | Rupprecht & Patashnick Company, Inc. | In-stack direct particulate mass measurement apparatus and method with pressure/flow compensation |
WO2009112947A2 (en) * | 2008-03-13 | 2009-09-17 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas sensor control system and control method |
JP5107973B2 (ja) * | 2009-03-11 | 2012-12-26 | 本田技研工業株式会社 | 排気浄化フィルタの故障検知装置 |
US8136343B2 (en) * | 2009-09-02 | 2012-03-20 | Ford Global Technologies, Llc | System for an engine having a particulate matter sensor |
JP2012012960A (ja) * | 2010-06-29 | 2012-01-19 | Nippon Soken Inc | 粒子状物質検出センサ |
JP5213979B2 (ja) * | 2011-03-17 | 2013-06-19 | 日本特殊陶業株式会社 | 微粒子センサおよびその取付構造 |
JP5681655B2 (ja) * | 2012-02-21 | 2015-03-11 | 日本特殊陶業株式会社 | 微粒子検知システム |
JP5829556B2 (ja) * | 2012-03-15 | 2015-12-09 | 日本特殊陶業株式会社 | 微粒子検知システム |
US8840222B2 (en) * | 2012-09-28 | 2014-09-23 | Hewlett-Packard Development Company, L.P. | Techniques related to satellite aerosols |
JP6285353B2 (ja) * | 2012-10-04 | 2018-02-28 | 日本特殊陶業株式会社 | 微粒子センサ |
US10330579B2 (en) * | 2013-10-25 | 2019-06-25 | Ngk Spark Plug Co., Ltd. | Particulate measurement system |
-
2013
- 2013-08-21 JP JP2013171120A patent/JP6182018B2/ja active Active
-
2014
- 2014-07-07 DE DE112014003839.3T patent/DE112014003839B4/de active Active
- 2014-07-07 US US14/911,095 patent/US9719907B2/en active Active
- 2014-07-07 WO PCT/JP2014/003584 patent/WO2015025456A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59196453A (ja) * | 1983-04-21 | 1984-11-07 | Nippon Denso Co Ltd | パテイキユレ−ト検出素子 |
JP2011513742A (ja) * | 2008-03-04 | 2011-04-28 | ぺガソー オーワイ | 粒子測定方法及び装置 |
JP2011033577A (ja) * | 2009-08-05 | 2011-02-17 | Ngk Spark Plug Co Ltd | 微粒子センサ |
WO2012114518A1 (ja) * | 2011-02-25 | 2012-08-30 | トヨタ自動車株式会社 | 粒子状物質検出センサの異常判定装置 |
JP2012194077A (ja) * | 2011-03-17 | 2012-10-11 | Ngk Spark Plug Co Ltd | 微粒子センサ |
JP2012237641A (ja) * | 2011-05-11 | 2012-12-06 | Ngk Spark Plug Co Ltd | 微粒子検知システム |
Non-Patent Citations (2)
Title |
---|
KAJIRO WATANABE ET AL.: "Measurement of the Soot and Discharged from Incinerators and Industry Plants", TRANSACTIONS OF THE SOCIETY OF INSTRUMENT AND CONTROL ENGINEERS, vol. 35, no. 10, 30 October 1999 (1999-10-30), pages 1236 - 1242, XP008043925 * |
SANG-GU LEE ET AL.: "Application and performance test of a micro-machined unipolar charger for real-time measurements of exhoust particles from a diesel engine vehicle", JOURNAL OF AEROSOL SCIENCE, vol. 42, no. 11, November 2011 (2011-11-01), pages 747 - 758, XP028280187, DOI: doi:10.1016/j.jaerosci.2011.07.003 * |
Also Published As
Publication number | Publication date |
---|---|
DE112014003839B4 (de) | 2022-03-10 |
DE112014003839T5 (de) | 2016-06-02 |
JP6182018B2 (ja) | 2017-08-16 |
US9719907B2 (en) | 2017-08-01 |
JP2015040738A (ja) | 2015-03-02 |
US20160195463A1 (en) | 2016-07-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6182018B2 (ja) | 微粒子検知システム | |
JP6251515B2 (ja) | 微粒子検知システム | |
JP2013195069A (ja) | 微粒子検知システム | |
JP6426976B2 (ja) | 粒子検知システム | |
WO2013161226A1 (ja) | 微粒子検知システム | |
JP6438847B2 (ja) | 粒子検知システム | |
JP7011914B2 (ja) | 微粒子検知システム | |
JP5681655B2 (ja) | 微粒子検知システム | |
JP2013170950A (ja) | 微粒子検知システム | |
JP5941575B2 (ja) | 微粒子検知システム | |
CN111094935B (zh) | 具有平坦的、露出的电晕放电电极的颗粒传感器 | |
JP6196936B2 (ja) | 微粒子検知システム | |
JP6396881B2 (ja) | 微粒子測定システム | |
JP6329494B2 (ja) | 微粒子センサ、及び、微粒子検知システム | |
JP5841016B2 (ja) | 微粒子検知システム | |
JP6435213B2 (ja) | 微粒子測定システム | |
JP6346577B2 (ja) | 微粒子測定システム | |
JP2015215207A (ja) | 微粒子検知システム及び微粒子検知方法 | |
JP6397705B2 (ja) | 粒子検知システム | |
JP6630581B2 (ja) | 微粒子検知システム | |
JP6397686B2 (ja) | 微粒子センサ | |
JP2018004474A (ja) | 電流測定装置および微粒子検出装置 | |
JP2017146146A (ja) | 微粒子検知システム | |
JP2017138122A (ja) | 微粒子検知システム |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14838107 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14911095 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1120140038393 Country of ref document: DE Ref document number: 112014003839 Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 14838107 Country of ref document: EP Kind code of ref document: A1 |