GB2395567A - Particle measuring system for diesel exhaust - Google Patents
Particle measuring system for diesel exhaust Download PDFInfo
- Publication number
- GB2395567A GB2395567A GB0326863A GB0326863A GB2395567A GB 2395567 A GB2395567 A GB 2395567A GB 0326863 A GB0326863 A GB 0326863A GB 0326863 A GB0326863 A GB 0326863A GB 2395567 A GB2395567 A GB 2395567A
- Authority
- GB
- United Kingdom
- Prior art keywords
- particles
- dielectric element
- measuring
- particle filter
- catalyst
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 239000002245 particle Substances 0.000 title claims abstract description 86
- 239000003054 catalyst Substances 0.000 claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 230000005684 electric field Effects 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims abstract 4
- 238000000034 method Methods 0.000 claims abstract 4
- 238000012544 monitoring process Methods 0.000 claims abstract 3
- 230000005611 electricity Effects 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000008929 regeneration Effects 0.000 claims description 10
- 238000011069 regeneration method Methods 0.000 claims description 10
- 230000003197 catalytic effect Effects 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000003745 diagnosis Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000001465 metallisation Methods 0.000 claims 1
- 230000011664 signaling Effects 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 239000004071 soot Substances 0.000 abstract description 2
- 239000004020 conductor Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
Landscapes
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Exhaust Gas After Treatment (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
A device for measuring the amount of particles contained in a fluid, comprising at least one dielectric element (10,12) having a collecting face on which the particles settle and a means (32) for measuring the electric resistance of the dielectric element (10,12). The device comprises a force generator which may be an electric field or a magnetic field generator for driving the particles towards the collecting face of the dielectric element. The generator may be in the form of two parallel conducting blades (40,42) or two tubular coaxial conducting elements (40,42, fig.3). Also disclosed is an exhaust system for handling exhaust gases contaminated by carbon-containing particles (or soot) incorporating such a device. Further disclosed is a method of monitoring the efficiency performance of a particle filter or catalyst in an exhaust line of an internal combustion engine by introducing such a device to the exhaust line.
Description
1 2395567
FIELD OF THE INVENTION
The present invention relates to a device for measuring the amount of particles contained in a fluid.
It notably applies to the sphere of fouling management of a filter element traversed s by a fluid carrying particles, such as carbon- containing particles or soots having a certain conductivity.
More particularly, the invention finds applications for measurement of the amount of carbon-containing particles passing through a particle filter arranged in the exhaust line of an internal-combustion engine.
0 These engines, and in particular Diesel engines, generate particularly large amounts of particles and their exhaust lines can be equipped with filter means which retain these particles with very high filtration efficiencies up to nearly 100 %.
BACKCiROllND OF THE INVENTION The problem when using such filters is that they have to be periodically Is regenerated, notably by combustion of the particles deposit, in order to prevent clogging of the filter through fouling.
In fact, filter clogging leads to an increase in the exhaust back pressure, which has the effect of increasing the fuel consumption of the engine. In the extreme case of total clogging of this filter, it may even lead to complete engine failure.
Regeneration by combustion of a particle filter sometimes occurs naturally when the temperature of the exhaust gas has reached the required level for oxidation of the particles present on this filter.
However, the average running conditions of the engine are such that the 5 temperature levels of the exhaust gas are not sufficient to provide regeneration of the filter, in which case it is necessary to artificially trigger combustion of the particles when filter fouling has reached a certain threshold.
The variation of the electric resistance measured between two points spaced out along a surface of a dielectric element on which the particles settle is therefore used, as 10 described in French patent applications No. 2,760,531 and 2,805,347.
More precisely, this collecting surface of the dielectric element, generally made of ceramic, is to be arranged transversely in relation to the direction of flow of the exhaust gas and the electric resistance of the surface is measured by means of measuring terminals arranged at two of its ends.
15 In the absence of particles, the measured resistance is infinite and, as particles settle, contact is made between the terminals and the resistance decreases. This resistance variation is directly linked with the amount of particles present on the collecting surface of the dielectric element.
This resistance variation thus allows to measure the amount of particles that have 20 potentially passed through the filter for a given time interval and to consider the actions required after this measurement, such as regeneration of this filter by heating, supply of energy in the exhaust gas,...
However, the applicant has observed that the measurement performed is not representative of the real amount of particles present in the exhaust gas.
In fact, formation of the particles deposit on the dielectric element can greatly depend on the conditions of flow of the exhaust gas, which itself depends on the 5 running conditions of the engine.
At high velocity of flow of the exhaust gas, generally when the engine is at high speed, part of the particles present in the gas hits the surface of the dielectric element, bounces on this surface and is carried back by the exhaust gas into the exhaust line.
The particles collected on the dielectric element are therefore not an accurate lo reflection of the particles present in the gas and, after measuring the resistance of the collecting surface, the actions to be undertaken will be carried out later whereas they are necessary at the time of the measurement.
The goal of the present invention is to overcome the aforementioned drawbacks by means of a more reliable measuring device independent of the engine running 15 conditions.
SI3MAIARY OF THE INVENTION
The device for measuring the amount of particles contained in a fluid, comprising at least one dielectric element having a collecting face on which the particles settle and a means for measuring the electric resistance of the dielectric element, is characterized in 20 that it comprises a force generator for driving said particles towards the collecting face of the dielectric element.
Preferably, the force generator can consist of an electric field generator.
The force generator can consist of a magnetic field generator.
Advantageously, the generator can comprise two electricity conducting elements between which the particles circulate.
The generator can comprise two electricity conducting elements in form of blades 5 arranged substantially parallel to one another.
The generator can comprise two tubular electricity conducting elements, substantially coaxial and fitting into each other.
Furthermore, at least one electricity conducting element can carry a dielectric element. lo The electricity conducting element can consist of a metal layer deposited by metallizing on the dielectric element.
Preferably, the dielectric element can comprise heating means.
The dielectric element can carry two terminals for measuring the electric resistance thereof. 5 Moreover, the dielectric element can be impregnated with at least one catalyst.
The fluid can be an exhaust gas of an internal-combustion engine.
The device can be applied to evaluation of a soot deposit for controlling regeneration of a particle filter and/or of a catalyst.
BRIEF DESCRIPTION OF THE FIGURES
Other features and advantages of the invention will be clear from reading the description hereafter, given by way of non limitative example, with reference to the
accompanying drawings wherein: 5 - Figure 1 diagrammatically illustrates a device for measuring the amount of particles according to the invention, Figure 2 is a diagrammatic perspective view of Figure 1, and - - Figure 3 is a variant of the device for measuring the amount of particles according to the invention.
10 DETAILED DESCRIPTION
With reference to Figures I and 2, the device for measuring the amount of particles P comprises two dielectric elements 1O, 12 of ceramic type, arranged opposite one another and at a distance from one another so as to leave a zone 14 through which the exhaust gas circulates (arrow A). These elements preferably have the shape of 5 parallelepipedic plates, preferably rectangles, whose large collecting faces 16, 18 arranged opposite one another are substantially parallel to one another and to the main lines through which the exhaust gas flows.
At least one 10 of the plates carries two measuring terminals 20, 22 such as electricity conducting bars, substantially parallel and embedded in the plate, whose one 20 edge 24, 26 sticks out beyond collecting face 16 or is flush with this face. These bars are arranged each in the vicinity of the upper and lower ends of the plate while being parallel to the direction of circulation of the exhaust gas and they form each a terminal
connected by electric conductors 28, 30 to a means 32 for measuring the electric resistance ofthis plate.
The plate also comprises heating means 34 consisting of a heating resistor supplied by an electric source such as a battery (not shown), by means of conductors 36, 38. This 5 resistor is integrated in the body of the plate and allows, when current-fed, to provide regeneration of this plate by combustion of the particles collected.
Each plate 10, 12 carries, on the face opposite its collecting face, an electricity conducting element 40, 42 which, in the example shown, has the configuration of a metal blade extending over the total surface of the face. These blades are also lo substantially parallel to one another and to the direction of flow of the exhaust gas. Each blade is connected to an electric conductor 44, 46 whose connection to a terminal of an electric source (not shown) allows to form an anode and a cathode. When powered up, this anode and this cathode form the poles of an electric field generator generating lines
of force.
15 This electric field (arrow F), which is globally substantially perpendicular to
collecting faces 16, 18, creates electric field lines or lines of force which pass through
- the plates from one blade to the next and exert an action on the particles present in th exhaust gas circulating in zone 14.
As already observed, the particles circulating in the gas bang together and also hit 20 the molecules of this gas and, as a result of these shocks, win or lose electrons by becoming positively or negatively charged.
Consequently, the carbon-containing particles which have a certain conductivity are subjected to the electric forces generated by the electric field, and these particles are
diverted from their initial trajectory and attracted towards the blade whose polarity is unlike that of the particles, as shown by way of example by arrow D in Figures I and 2.
5 These particles are thus collected on the collecting face of the plate carrying this blade.
A carbon-containing particles deposit thus forms on collecting face 16 of plate 10, provides an electric link between bars 20, 22 and the electric resistance of this face is modified, as can be easily quantified by measuring means 32.
It has been shown that, during circulation of these particles, the distribution between lo the particles of positive polarity and those of negative polarity is substantially equal. It is therefore possible to know, by simple correlation of the measured resistance, the amount of particles collected on collecting face 16 and, by extrapolation, the total amount of particles collected and initially contained in the exhaust gas.
Of course, heating means 34 can be controlled according to various criteria to burn 5 the particles accumulated on collecting face 16 and thus to periodically restore the measuring capacity of this device.
Heating means 34 may also be configured in such a way that they can initiate the combustion of the carbon-containing particles both on face 16 and on face 18 of plates 10 and 12.
20 It is also possible that, besides heating means 34 of plate 10, heating means are also arranged inside the body of plate 12, for example in form of a resistor similar to the one
carried by plate in, to burn the particles collected on face 18 simultaneously with the combustion of the particles on face 16.
Without departing from the scope of the invention, a convergent can be arranged at the inlet of exhaust gas circulation zone 14 so as to facilitate inflow of this gas. By way 5 of example, this convergent can consist of a bevel on the front edges of plates 10, 12, as shown by the dotted line in Figure 1.
The advantage of this measuring device lies in the fact that it allows not to be dependent on the conditions of circulation of the gas. In fact, it is possible to set the power of the electric field in such a way that all the particles passing through zone 14
10 are collected on the collecting faces and to prevent, by means of the electric force, the particles from being carried along by the exhaust gas.
Moreover, in case of an application of this measuring device to the management of a particle filter, its interest lies in the fact that collecting face 16, on which the resistance is measured, clogs up in the same way as the filter.
15 Thus, if this device is arranged upstream from a particle filter, it is easy to know in real time the fouling rate of the filter and to start regeneration of this filter at the suitable time. Furthermore, by arranging this measuring device after the particle filter, it is possible to evaluate the performance of the filter and to detect a possible failure. This is 20 particularly useful within the context of OBD type (On Board Diagnosis) vehicle equipment diagnosis allowing to trigger an alarm bell or a warning light at the dashboard of this vehicle in case of failure of this filter.
Moreover, knowing at all times the amount of particles present in the exhaust gas, it is possible to control the engine strategies as finely as possible.
Figure 3 is a variant of Figures 1 and 2 and therefore comprises the same reference numbers. s This device comprises two ceramic dielectric elements 10, 12 in form of coaxial cylindrical tubes fitting into each other. The inside and outside diameters of these tubes are such that they provide, between the tubes, a zone 14 for circulation of the exhaust gas. The two cylindrical walls of the tubes facing each other form collecting faces 16, 18 of the dielectric elements, i.e. the faces on which the particles contained in the lo exhaust gas circulating substantially coaxially to the tubes (arrow A) are collected.
External tube 10 carries two measuring terminals 20, 22 intended to measure the electric resistance of collecting face 16. These terminals, in form of bars, extend axially along the external tube while having a projecting edge 24, 26 from collecting face 16 or flush with this face. As described above in connection with Figures l and 2, these bars 15 are connected to a resistance measuring means by conductors 28, 30.
This external tube also carries heating means 34 consisting of a resistor embedded in the mass of the tube and current-fed by conductors 36, 38.
Electricity conducting elements are arranged on the cylindrical walls opposite the collecting faces of each tube.
20 More particularly, each tube 10, 12 carries, on the cylindrical wall opposite its collecting face 16, 18, a tubular metal housing 40, 42. These tubular housings are
connected by connectors 44, 46 to a source of current so as to form a dipole consisting of an anode and a cathode.
When the housings are current-fed, an electric field (arrows F) which has a radial
direction while remaining substantially perpendicular to collecting faces 16, 18 of tubes 5 10, 12 is created.
The particles contained in the exhaust gas circulating in zone 14 are collected on collecting faces 16, 18 as described above in connection with Figures 1 and 2.
Of course, the inlet of the inner volume of housing 42 can be obstructed or provided with a divergent so that the majority of the gas circulates in zone 14.
0 Advantageously, electricity conducting elements 40, 42 of Figures 1 to 3 can consist of a layer of metal deposited on the faces opposite collecting faces 16, 18 during a metallizing operation.
More advantageously, this device can be used, with minor modifications, in combination with catalytic filters or catalysts, notably four-way catalysts. These catalysts are generally catalysts impregnated with catalytic phases, notably based on noble metals, which allow to reduce andlor to oxidize and/or to store exhaust gas pollutants such as NOx.
In this case, the collecting surface of this filter has to be free of any fouling due to particles in order to keep the catalytic properties of the surface of this filter intact.
20 With the measuring device described above, the collecting faces of the dielectric elements are designed to be coated with the same catalytic phases as the catalyst. These faces will therefore be subjected to the same fouling conditions as the catalyst.
Preventive catalyst regeneration actions can thus be undertaken before the measured resistance of the particles deposit on the collecting faces allows to detect a fouling rate harmful to catalysis.
This also allows to have a very accurate control strategy as regards the amount of 5 particles contained in the exhaust gas and to have the most continuous catalyst regeneration possible.
This fouling limitation of the surface also allows to avoid too violent a combustion of these particles likely to deteriorate the wash-coat the catalyst is generally provided with. lo The present invention is not limited to the examples described above and involves any variant.
Notably, the field in zone 14 can be a field of magnetic or electromagnetic origin.
In the case of a magnetic field, blades or housings 40, 42 represent the opposite
poles of a permanent magnet. In the case of an electromagnetic field, the blades or the
ls housings are a dipole which generates a magnetic field when they are powered up. The
particles which pass through this field are subjected to the magnetic forces of the field
and are therefore diverted from their trajectory towards the collecting faces.
Claims (1)
1) A device for measuring the amount of particles contained in a fluid, comprising at least one dielectric element having a collecting face on which the particles settle and a means for measuring the electric resistance of the dielectric element, wherein s the device comprises a force generator for driving said particles towards the collecting face of the dielectric element.
2) A device as claimed in claim 1, wherein the force generator consists of an electric field generator.
3) A device as claimed in claim 1, wherein the force generator consists of a lo magnetic field generator.
4) A device as claimed in any one of the previous claims, wherein the generator comprises two electricity-conducting elements between which the particles circulate. 5) A device as claimed in any one of the previous claims, wherein the 5 generator comprises two electricity conducting elements in form of blades arranged substantially parallel to one another.
6) A device as claimed in any one of claims 1 to 4, wherein the generator comprises two tubular electricity-conducting elements arranged to be substantially coaxial and fitting into one another.
20 7) A device as claimed in any one of claims 4 to 6, wherein at least one electricity-conducting element carries a dielectric element.
8) A device as claimed in any one of claims 4 to 7, wherein the electricity conducting element consists of a metal layer formed by metaldeposition upon a dielectric element. 25 9) A device as claimed in any one of the previous claims, wherein the dielectric element comprises heating means.
10) A device as claimed in any one of the previous claims, wherein the dielectric element carries two terminals for measuring the electric resistance thereof.
4988/()0 AR
11) A device as claimed in any one of the previous claims, wherein the dielectric element is impregnated with at least one catalyst.
12) A device as claimed in claim 1, wherein the fluid is an exhaust gas of an internal-combustion engine.
5 13) A device for measuring the amount of particles contained in a fluid, substantially as hereinbefore described with reference to, and as shown in, Figs. 1 and 2.
14) A device for measuring the amount of particles contained in a fluid, substantially as hereinbefore described with reference to, and as shown in Fig. 3.
15) An exhaust system adapted for handling exhaust gases contaminated by lo particles by incorporating a device for collecting such particles from the exhaust gases, said device comprising at least one dielectric element having a collecting face on which the particles settle and a means for measuring the electric resistance of the dielectric element, wherein the device comprises a force generator for driving said particles towards the collecting face of the dielectric element.
16) An exhaust system for an internal-combustion engine, said system including a particle filter, and being adapted for monitoring the condition of said particle filter by the presence of a measuring device as claimed in any one of the preceding claims 1 to 14.
17) An exhaust system according to claim 16, wherein such a measuring 20 device is arranged upstream from said particle filter.
18) An exhaust system according to claim 16, wherein such a measuring device is arranged downstream from said particle filter.
19) An exhaust system according to claim 17, or claim 18, wherein the particle filter is a catalytic filter or catalyst, particularly of the four-way catalyst type.
2s 20) An exhaust system according to claim 19, wherein the collecting faces of the dielectric elements of the device are coated with the same catalytic phases as the catalyst. 4988/) AR
21) Application of the device as claimed in any one of claims 1 to 14 to evaluation of a particles deposit for controlling regeneration of a particle filter.
22) Application of the device as claimed in any one of claims 1 to 14 to evaluation of a particles deposit for controlling regeneration of a catalyst.
s 23) A method of monitoring the efficiency performance of a particle filter or catalyst in an exhaust line of an internal combustion engine, by introducing to the exhaust line a device comprising at least one dielectric element having a collecting face on which sooty fouling particles may settle in use, and a means for measuring the electric resistance of the dielectric element, wherein the device comprises a force generator for driving said 0 particles towards the collecting face of the dielectric element, and evaluating the sooty fouling deposit accumulating upon the collecting face of the device.
24) A method according to claim 23, wherein the device is arranged downstream of the particle filter or catalyst, and adapted to cooperate with a vehicle equipment diagnosis (OBD) system in order to trigger a signalling device whenever the 5 evaluation corresponds to an unacceptable level of fouling indicative of a failure risk.
25) A method according to claim 23, or claim 24, wherein the evaluation of the efficiency performance is applied as feedback to an engine management system to control the engine operating strategy.
4988/00 AR
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0214709A FR2847671B1 (en) | 2002-11-22 | 2002-11-22 | DEVICE FOR MEASURING THE QUANTITY OF PARTICLES CONTAINED IN A FLUID, ESPECIALLY IN EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0326863D0 GB0326863D0 (en) | 2003-12-24 |
| GB2395567A true GB2395567A (en) | 2004-05-26 |
| GB2395567B GB2395567B (en) | 2006-04-12 |
Family
ID=29763938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0326863A Expired - Fee Related GB2395567B (en) | 2002-11-22 | 2003-11-17 | Device for measuring the amount of particles contained in a fluid,notably in the exhaust gas of an internal-combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2004177407A (en) |
| DE (1) | DE10353897B4 (en) |
| FR (1) | FR2847671B1 (en) |
| GB (1) | GB2395567B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006027287A1 (en) * | 2004-09-07 | 2006-03-16 | Robert Bosch Gmbh | Sensor element for particle sensors and method for the production thereof |
| WO2007050384A3 (en) * | 2005-10-21 | 2007-12-21 | Honeywell Int Inc | System for particulate matter sensor signal processing |
| EP1921437A2 (en) | 2006-11-08 | 2008-05-14 | HONDA MOTOR CO., Ltd. | Sensing device and method |
| CN102661881A (en) * | 2012-04-28 | 2012-09-12 | 深圳市兰德玛水环境工程科技有限公司 | Intelligent supervision system and method for emission of fuel exhaust gas and fine particles of motor vehicles and ships |
| US9062576B2 (en) | 2010-12-22 | 2015-06-23 | Caterpillar Inc. | Exhaust particulate filter system and operating method therefor |
| CN105067600A (en) * | 2015-09-08 | 2015-11-18 | 河北先河环保科技股份有限公司 | Determination device for nitrate and ammonium salt in atmospheric particulates and application method thereof |
| EP2356421A4 (en) * | 2008-11-21 | 2017-09-13 | Board of Regents of the University of Texas System | Rigid particulate matter sensor |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008009494A1 (en) * | 2008-02-15 | 2009-08-27 | Fachhochschule Dortmund | Device for measuring concentration and/or size distribution of soot particles in diesel exhaust gas of diesel vehicle in workshops, has magnets exhibiting magnetic field to deflect particles to electrodes dependent on size |
| JP2012058015A (en) * | 2010-09-07 | 2012-03-22 | Ngk Insulators Ltd | Particulate substance detector |
| EP3786614A1 (en) | 2019-08-29 | 2021-03-03 | Carl Freudenberg KG | Method for providing an air flow |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0401724A2 (en) * | 1989-06-05 | 1990-12-12 | Wahlco, Inc. | Measurement of electrical resistivity of particulate entrained in a gas stream |
| US5179346A (en) * | 1991-05-24 | 1993-01-12 | Caterpillar, Inc. | Conductive particle sensor using a magnet |
| US5247827A (en) * | 1992-04-14 | 1993-09-28 | Bell Communications Research, Inc. | Resistive measurement of airborne contaminants |
| EP0893683A1 (en) * | 1997-07-22 | 1999-01-27 | Brueninghaus Hydromatik Gmbh | Sensor for detecting fluid contamination |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3304548A1 (en) * | 1983-02-10 | 1984-08-16 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD AND DEVICE FOR MEASURING THE CONTENT OF CONDUCTIVE PARTICLES IN GASES |
| DE3608801A1 (en) * | 1986-03-15 | 1987-09-17 | Fev Forsch Energietech Verbr | METHOD AND DEVICE FOR REGENERATING PARTICLE FILTER SYSTEMS |
| AT405435B (en) * | 1988-11-30 | 1999-08-25 | Fleck Carl M Dr | Method for the separation and combustion of soot particles from diesel exhaust gases and diesel exhaust gas filter for carrying out the method |
| US4979364A (en) * | 1988-03-11 | 1990-12-25 | Fleck Carl M | Diesel fuel exhaust gas filter |
| AU9146191A (en) * | 1991-10-25 | 1993-05-21 | Caterpillar Inc. | Method and apparatus for initiating regeneration in an engine exhaust particulate filter |
| EP1224023B1 (en) * | 1999-09-03 | 2005-05-18 | The Cleveland Clinic Foundation | Continuous particle and molecule separation with an annular flow channel |
| FR2805347B1 (en) * | 2000-02-22 | 2002-07-12 | Inst Francais Du Petrole | DEVICE FOR CONTROLLING THE FLOW OF CONDUCTIVE PARTICLES IN A GAS STREAM |
| DE10020539A1 (en) * | 2000-04-27 | 2001-11-08 | Heraeus Electro Nite Int | Measuring arrangement and method for determining soot concentrations |
-
2002
- 2002-11-22 FR FR0214709A patent/FR2847671B1/en not_active Expired - Fee Related
-
2003
- 2003-11-17 GB GB0326863A patent/GB2395567B/en not_active Expired - Fee Related
- 2003-11-18 DE DE10353897A patent/DE10353897B4/en not_active Expired - Fee Related
- 2003-11-20 JP JP2003390571A patent/JP2004177407A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0401724A2 (en) * | 1989-06-05 | 1990-12-12 | Wahlco, Inc. | Measurement of electrical resistivity of particulate entrained in a gas stream |
| US5179346A (en) * | 1991-05-24 | 1993-01-12 | Caterpillar, Inc. | Conductive particle sensor using a magnet |
| US5247827A (en) * | 1992-04-14 | 1993-09-28 | Bell Communications Research, Inc. | Resistive measurement of airborne contaminants |
| EP0893683A1 (en) * | 1997-07-22 | 1999-01-27 | Brueninghaus Hydromatik Gmbh | Sensor for detecting fluid contamination |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006027287A1 (en) * | 2004-09-07 | 2006-03-16 | Robert Bosch Gmbh | Sensor element for particle sensors and method for the production thereof |
| WO2007050384A3 (en) * | 2005-10-21 | 2007-12-21 | Honeywell Int Inc | System for particulate matter sensor signal processing |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE10353897B4 (en) | 2013-11-07 |
| JP2004177407A (en) | 2004-06-24 |
| GB0326863D0 (en) | 2003-12-24 |
| FR2847671A1 (en) | 2004-05-28 |
| GB2395567B (en) | 2006-04-12 |
| FR2847671B1 (en) | 2005-12-02 |
| DE10353897A1 (en) | 2004-06-03 |
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| PCNP | Patent ceased through non-payment of renewal fee |
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