EP3874280A1 - Verfahren und vorrichtung zur ermittlung einer geschwindigkeit eines fluidstroms im bereich eines partikelsensors - Google Patents
Verfahren und vorrichtung zur ermittlung einer geschwindigkeit eines fluidstroms im bereich eines partikelsensorsInfo
- Publication number
- EP3874280A1 EP3874280A1 EP19786968.8A EP19786968A EP3874280A1 EP 3874280 A1 EP3874280 A1 EP 3874280A1 EP 19786968 A EP19786968 A EP 19786968A EP 3874280 A1 EP3874280 A1 EP 3874280A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- determining
- fluid flow
- particle
- particle sensor
- time
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/20—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using particles entrained by a fluid stream
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
- G01F1/708—Measuring the time taken to traverse a fixed distance
- G01F1/7088—Measuring the time taken to traverse a fixed distance using electrically charged particles as tracers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/08—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring variation of an electric variable directly affected by the flow, e.g. by using dynamo-electric effect
Definitions
- the disclosure relates to a method for determining a speed of a fluid flow in the area of a particle sensor.
- the disclosure further relates to a device for determining a
- Velocity of a fluid flow in the area of a particle sensor Velocity of a fluid flow in the area of a particle sensor.
- Preferred embodiments relate to a method for determining a speed of a fluid flow in the area of a particle sensor, the fluid flow moving along a flow path, the
- Particle sensor has a particle charging device arranged at a first position of the flow path for charging particles in the fluid flow and a measuring device arranged at a second position of the flow path located downstream of the first position for determining at least one electrical variable of the fluid flow, the method performing the following Steps comprises: determining a first time profile, which is an electrical variable of the particle charging device
- the fluid flow can be an exhaust gas flow from an internal combustion engine, for example a motor vehicle.
- the particles can be soot particles, such as those that arise during the combustion of fuel by an internal combustion engine.
- an exhaust gas volume flow can be determined in the area, in particular within, the particle sensor.
- Evaluating includes a temporal correlation of the first temporal course and the second temporal course. This makes it particularly precise
- Particle charging device has a corona electrode, the first time profile characterizing a corona current flowing through the corona electrode.
- Measuring device has a measuring electrode, the second time profile characterizing a measuring current flowing through the measuring electrode.
- a corona voltage applied to the corona electrode is changed, in particular modulated by means of a predefinable modulation signal.
- Measuring device has an ion trap and / or a sensing electrode, the second time profile in particular characterizing an electrical charge detected at the sensing electrode.
- An ion trap and / or sensing electrode already present in the particle sensor can preferably be used as (part of) the measuring device. In further preferred embodiments it is provided that the
- the velocity of the fluid flow is determined as a function of a time offset between the first time course and the second time course.
- the time offset is characteristic of the speed of the fluid flow and generally allows for - known, constant distance between the first position and the second position along the flow path - the direct determination of the speed of the fluid flow.
- the concentration of particles in the fluid flow is determined.
- Particle charging device arranged in the flow path for charging particles in the fluid flow and a measuring device arranged at a second position of the flow path, which is downstream with respect to the first position, for determining at least one electrical variable of the fluid flow
- the device being designed to carry out the following steps: a first time course, which characterizes an electrical variable of the particle charging device, determining, by means of the measuring device, a second time curve, which characterizes at least one electrical variable of the fluid flow, evaluation of the second time curve with respect to the first time curve.
- Device for performing the method is designed according to the embodiments.
- FIGS. 1-10 relate to a use of the method according to the embodiments and / or the device according to the Embodiments and / or the particle sensor according to the embodiments for determining an exhaust gas velocity, in particular in the area of the particle sensor.
- Embodiments and / or the particle sensor according to the embodiments can be used, for example, in an exhaust system of an internal combustion engine.
- Figure 1 schematically shows a side view of a particle sensor according to
- FIG. 2 schematically shows a simplified flow diagram of a method according to preferred embodiments
- FIG. 3 schematically shows a simplified flow diagram of a method according to further preferred embodiments
- FIG. 7 schematically shows a simplified block diagram of a particle sensor according to further preferred embodiments.
- FIG. 8 schematically shows a simplified block diagram of a device according to further preferred embodiments.
- FIG. 1 schematically shows a side view of a particle sensor 100 for particles according to preferred embodiments, in the area of which there is a fluid stream A1 which moves along a flow path 102.
- the fluid stream A1 is, for example, an exhaust gas stream
- the particles can be soot particles, such as those that arise during the combustion of fuel by an internal combustion engine.
- the flow path 102 can be predetermined, for example, by a protective tube R and / or another device for directing the fluid flow A1.
- E.g. can the particle sensor 100 in the area of an exhaust tract
- Internal combustion engine can be arranged, wherein the protective tube R is connected to the exhaust tract that the exhaust gas flow A1 is established.
- the particle sensor 100 has a particle charging device 104
- the particle sensor 100 also has a measuring device 106 for determining at least one electrical variable of the fluid flow A1, which is located at a second position P2 of the flow path 102, in particular
- a device 300 which is designed to carry out the method described below with reference to the flowchart in FIG. 2.
- the method has the following steps: determining 200 a first time profile V1 (FIG. 1), which characterizes an electrical variable of the particle charging device 104, determining 202 (FIG. 2), using the measuring device 106 (FIG. 1), a second one time course V2, which characterizes at least one electrical variable of the fluid flow A1, evaluating 204 the second time course V2 with respect to the first time course V1. From this evaluation 204, the velocity of the fluid flow A1 in the area of the particle sensor 100 can advantageously be determined getting closed.
- the speed of the fluid flow A1 is determined as a function of a time offset between the first time course V1 and the second time course V2.
- the time offset is characteristic of the speed of the fluid flow A1 and, given the known distance between the first position P1 and the second position P2 along the flow path 102, allows the speed of the fluid flow A1 to be determined directly.
- an exhaust gas volume flow can be determined in the area, in particular within, of the particle sensor 100 or within the protective tube R.
- Evaluation 204 comprises a time correlation 204a of the first time course V1 (FIG. 1) and the second time course V2. This enables a particularly precise determination of the speed of the fluid flow.
- Particle charging device 104 has a corona electrode 104a (FIG. 1), the first time profile V1 characterizing a corona current flowing through the corona electrode 104a.
- Measuring device 106 has a measuring electrode 106a, the second time profile V2 characterizing a measuring current flowing through the measuring electrode 106a.
- a corona voltage applied to the corona electrode 104a is changed, in particular modulated by means of a predefinable modulation signal.
- the generation of ions in the fluid stream A1 can be influenced in a targeted manner, which enables a particularly simple evaluation of the first and second time profiles V1, V2, in particular on the basis of the known modulation signal. This is illustrated by the flow chart of FIG. 3.
- step 198 the corona voltage applied to the corona electrode 104a (FIG.
- Flow path 102 - can be determined and evaluated by steps 200, 202, 204 according to FIG. 3, which correspond to steps 200, 202, 204 according to FIG. 2.
- Area of the particle charger 104 can be used to under
- Measuring device 106 has an ion trap, in particular with a so-called trap electrode, and / or a sensing electrode.
- the measuring device 106 can thus advantageously utilize components that may already exist
- Particle sensor 100 are provided.
- FIGS. 1-10 Further preferred embodiments relate to a particle sensor 100 with at least one device 300 (FIG. 1) according to FIGS.
- FIG. 4 schematically shows an operating scenario according to further preferred embodiments.
- An example here is an i.w. circular cylindrical
- Flow path 102 is provided, into which an exhaust gas flow A1 enters from the left end 102a in FIG. 4 and from which the exhaust gas flow A1 can exit through an end 102b right in FIG. 4.
- the flow path 102 or the components surrounding it are e.g. of the particle sensor 100a is not shown in the present example
- the particle sensor 100a can also have an essentially planar configuration in further embodiments (not shown).
- the particle sensor 100a has a corona needle 104a '
- the ion trap 107 may be a charged electrode in preferred embodiments, but may also be a combination of the electrode and in other preferred embodiments
- Counter electrode to which a trap voltage u trap is applied.
- a particle concentration can be measured by the particle sensor 100a according to FIG. 4 by determining the charge carried by particles electrically charged by the corona needle 104a 'from the sensor 100a, or by detecting the charged particles by an influence electrode (not shown) ).
- the corona needle 104a ' is connected to a by a voltage source 108
- Corona voltage u CO r is supplied, as a result of which the corona current i cor is set by the corona needle 104a '.
- the corona current i cor is preferably variable over time.
- the variation of the corona current i CO r occurs over time consciously, in particular by modulating the corona voltage u CO r, or the corona current varies by natural
- the currents at the corona C (i CO r, corresponding to, for example, the first time profile V1) and at the ion trap 107 (i tr ap, FIG. 4, corresponding to, for example, the second time profile) Course V2) are measured and correlated in time. The calculation of the
- Exhaust gas velocity from the ion velocity is carried out in further preferred embodiments using a (e.g. previous)
- FIG. 5 schematically shows an operating scenario according to further preferred embodiments.
- a sensing electrode 109 behind the ion trap 107, which measures the charge of the particles in their immediate vicinity.
- This sensing electrode 109 can be, for example, the actual measuring electrode for determining the particle concentration of the particle sensor 100b.
- the ion trap 107 arranged upstream with respect to the sensing electrode 109 first sifts the ions from the exhaust gas stream A1, and the downstream sensing electrode 109 detects the charges Q sen ns in its vicinity by electrostatic influence. The majority of these are located on particles charged by corona ions.
- FIG. 5 schematically shows an operating scenario according to further preferred embodiments.
- the time offset t between the corona current i cor and the sensed charge Q se ns is determined, for example by means of correlation, and the ion and exhaust gas speeds are determined via the known length h between the corona tip 104a 'and the sensing electrode 109 .
- the ion trap 107 can be omitted as a separate component, since the ions already flow through the sensor or the
- Sensing electrode 109 are intercepted. This can be done by designing the ion trajectory as well as by the electrical potential of different components, as well as by a combination of both mechanisms.
- FIG. 6 schematically shows an operating scenario according to further preferred embodiments.
- Upstream in front of ion trap 107 is one
- Sensing electrode 109a arranged, which detects charges Q se ns, ion located in the immediate vicinity by influence. Depending on the basic measuring principle, there is a further sensing electrode for particle charges after ion trap 107 (not shown). In further embodiments and analogous to FIG. 5, the ion trap 107 as a separate component can also be omitted here.
- the Most of the charge detected by the sensing electrode 109a is on ions, but may also have already partially passed over to particles of the exhaust gas stream A1, in particular soot particles.
- the distance between the corona tip 104a 'and the sensing electrode 109a is I2. Analogous to those described above with reference to FIGS. 1 to 5
- the temporal signal above the sensing electrode 109a (corresponding to the second time profile V2) is evaluated and e.g. its temporal correlation to the corona signal (corresponding to the first time curve V1) is formed.
- the distance I2 divided by the resulting time interval gives the ion velocity and the exhaust gas velocity derived therefrom.
- any spatially consecutive elements in particular one behind the other with respect to the flow path 102 of the particle sensor 100, 100a, 100b, 100c.
- Such elements can be, for example: a sensing electrode 109, 109a for ions or for charged particles, an ion trap 107 or more of these elements. If the respective spatial distance is known, the speed of the can be determined from the respective time offset t of the signals (e.g. determined by correlating the relevant signals in the area of the elements under consideration)
- Fluid flow A1 can be calculated in this section.
- FIG. 7 schematically shows a simplified block diagram of a
- the particle sensor 10Od which for example at least partially corresponds to at least one of the configurations shown in FIGS. 1 to 6 or has at least one of these configurations, additionally advantageously has a device 300 for determining the speed of the fluid flow A1 in the region of the
- the device 300 can be supplied with time profiles V1, V2 of the corona current i CO r and the trap current itrap, and the device 300 can be applied using the principle according to FIGS
- Embodiments determine the speed of the fluid flow A1 from this.
- FIG. 8 schematically shows a simplified block diagram of a device 300a according to further preferred embodiments.
- the device 300 according to FIGS. 1, 7 can have the configuration 300a according to FIG. 8.
- the device 300a has a computing unit 302 (for example a microprocessor and / or microcontroller and / or programmable logic module,
- the memory unit 304 has a volatile memory 304a, in particular working memory (RAM), and a non-volatile memory 304b, e.g. a flash EEPROM, on.
- RAM working memory
- non-volatile memory 304b e.g. a flash EEPROM
- Non-volatile memory 304b stores at least one computer program PRG1 for the arithmetic unit 302, which controls the execution of the method according to the embodiments and / or another operation of the device 300, 300a.
- the computer program PRG1 (or another computer program) can also control the determination of a particle concentration, for example by evaluating the signals obtained by means of the sensing electrode 109, 109a.
- An interface unit 306 is optionally provided for receiving the first time profile V1 and / or the second time profile V2 or variables characterizing these time profiles.
- the computing unit 302 can be designed as a microcontroller and the interface unit 306 can represent an analog-to-digital converter (ADC), which is preferably integrated in the microcontroller 302 and for which the corona current i CO r
- the generation of ions in the fluid stream A1 (FIG. 1) can be influenced in a targeted manner, which enables a particularly simple evaluation of the first and second time profiles V1, V2.
- the principle according to the embodiments enables a precise determination of the speed of the fluid flow A1, in particular exhaust gas flow A1, in the area of a particle sensor 100, 100a, 100b, 100c, 100d and thus, for example, the determination of the exhaust gas volume flow within the particle sensor.
- a particle concentration for example of soot particles in the exhaust gas, can thereby be determined particularly precisely.
- the use of the principle according to the embodiments is particularly advantageous, for example, in those particle sensors which are operated without controlled exhaust gas supply, for example without a compressed air ejector, because here the
- Exhaust gas volume flow in the particle sensor is dependent on external parameters, such as the crank angle, the engine speed, the load, the stocking of the
- the fluid flow A1 is variable over time and is subject to strong fluctuations.
- Particle concentration measurement especially their elimination. These are essentially: a dependency of the electrical charge carried by the particle sensor on the exhaust gas volume flow in the particle sensor, a dependency of the particle charge on the charging time and thus on the exhaust gas velocity in the particle sensor.
- the principle according to the embodiments further advantageously enables an exact determination of the particle concentration, in particular without the
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018218590.5A DE102018218590A1 (de) | 2018-10-30 | 2018-10-30 | Verfahren und Vorrichtung zur Ermittlung einer Geschwindigkeit eines Fluidstroms im Bereich eines Partikelsensors |
PCT/EP2019/077651 WO2020088914A1 (de) | 2018-10-30 | 2019-10-11 | Verfahren und vorrichtung zur ermittlung einer geschwindigkeit eines fluidstroms im bereich eines partikelsensors |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3874280A1 true EP3874280A1 (de) | 2021-09-08 |
Family
ID=68240751
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19786968.8A Withdrawn EP3874280A1 (de) | 2018-10-30 | 2019-10-11 | Verfahren und vorrichtung zur ermittlung einer geschwindigkeit eines fluidstroms im bereich eines partikelsensors |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3874280A1 (de) |
CN (1) | CN112997083A (de) |
DE (1) | DE102018218590A1 (de) |
WO (1) | WO2020088914A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117250368A (zh) * | 2023-11-17 | 2023-12-19 | 北京理工大学 | 一种涡轮进出口流速测量装置及总温标定方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4393719A (en) * | 1981-07-20 | 1983-07-19 | United Technologies Corporation | Ionization flowmeter |
DE3907387A1 (de) * | 1989-03-08 | 1990-09-13 | Singer Hermann | Verfahren zur messung von partikeln in polydispersen systemen und von partikelkonzentrationen monodisperser aerosole sowie messvorrichtung zur durchfuehrung des verfahrens |
DE19650112C1 (de) * | 1996-12-03 | 1998-05-20 | Wagner Int | Einrichtung und Verfahren zum Messen eines Pulver-Massestromes |
DE19651611A1 (de) * | 1996-12-12 | 1998-06-18 | Bosch Gmbh Robert | Einrichtung zur Messung einer Teilchenzustandsgröße |
JP4568387B2 (ja) * | 1999-03-19 | 2010-10-27 | 嘉二郎 渡邊 | 粉粒体の流動計測装置 |
DE102009046315A1 (de) * | 2009-11-03 | 2011-05-05 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Betreiben eines Partikelsensors |
WO2012015898A1 (en) * | 2010-07-28 | 2012-02-02 | Univation Technologies, Llc | Systems and methods for measuring velocity of a particle/fluid mixture |
CN203443878U (zh) * | 2011-12-08 | 2014-02-19 | 皮卡索尔公司 | 用于监测包括气溶胶的通道或空间内的颗粒的装置 |
DE102012210525A1 (de) * | 2012-06-21 | 2013-12-24 | Robert Bosch Gmbh | Verfahren zur Funktionskontrolle eines Sensors zur Detektion von Teilchen und Sensor zur Detektion von Teilchen |
CN103389117A (zh) * | 2013-07-24 | 2013-11-13 | 华北电力大学 | 基于阵列式静电传感器的粉体流动在线测量装置及方法 |
-
2018
- 2018-10-30 DE DE102018218590.5A patent/DE102018218590A1/de not_active Withdrawn
-
2019
- 2019-10-11 EP EP19786968.8A patent/EP3874280A1/de not_active Withdrawn
- 2019-10-11 CN CN201980072685.1A patent/CN112997083A/zh active Pending
- 2019-10-11 WO PCT/EP2019/077651 patent/WO2020088914A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
DE102018218590A1 (de) | 2020-04-30 |
CN112997083A (zh) | 2021-06-18 |
WO2020088914A1 (de) | 2020-05-07 |
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