EP0770215A1 - Procede et systeme permettant de traiter des gaz brules, notamment des gaz d'echappement de moteurs a combustion interne - Google Patents

Procede et systeme permettant de traiter des gaz brules, notamment des gaz d'echappement de moteurs a combustion interne

Info

Publication number
EP0770215A1
EP0770215A1 EP95910436A EP95910436A EP0770215A1 EP 0770215 A1 EP0770215 A1 EP 0770215A1 EP 95910436 A EP95910436 A EP 95910436A EP 95910436 A EP95910436 A EP 95910436A EP 0770215 A1 EP0770215 A1 EP 0770215A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
clean air
sample gas
standard volume
gas
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.)
Ceased
Application number
EP95910436A
Other languages
German (de)
English (en)
Inventor
Sylvain Van Damme
Gerhard Rauch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0770215A1 publication Critical patent/EP0770215A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0011—Sample conditioning
    • G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0011—Sample conditioning
    • G01N33/0018—Sample conditioning by diluting a gas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N2001/2264—Sampling from a flowing stream of gas with dilution

Definitions

  • the invention relates to a method and an arrangement for processing exhaust gases, in particular combustion engines, for analysis according to the preamble of claim 1.
  • the present invention has for its object to provide a method and an arrangement for treating exhaust gas for analysis, in which the measured proportions of the components in the sample gas match as well as possible the proportions of the components released into the ambient air via the exhaust gas. Furthermore, an arrangement for carrying out this method is to be created.
  • the invention enables only as much sample gas to be taken as is necessary for determining the pollutant emission.
  • the clean air required for dilution is correspondingly low. It is therefore also possible to produce clean air, eg. B. the so-called synthetic air can be used, which consists practically exclusively of oxygen and nitrogen in the ratio normally existing in air and which is free of water vapor and hydrocarbons. Due to the lack of water vapor, the admixed amount of clean air can be smaller than with use of ambient air. This results in a lower dilution of the sample gas, so that the concentration of the pollutant components to be measured in the measuring gas supplied to the analyzer and thus the measuring accuracy is higher.
  • the system can be connected to the exhaust of a motor vehicle. It consists of plastic and is designed so that the mechanical vibrations are strongly damped by the motor vehicle.
  • the exhaust hose 2 opens into a flow calming element, which is formed by a pneumatic low-pass filter. The flow calming element is also heated.
  • a measuring tube 4 from which the exhaust gas is released into the ambient air.
  • the measuring tube 4 contains a sampling probe 5, a temperature sensor 7 and a pressure sensor 8. Furthermore, a flow meter 6 is attached to it.
  • the signals from the flow meter, the pressure and the temperature sensor are fed to a control unit 9, which determines the standard volume flow, ie the amount of exhaust gas flowing through the measuring tube 4 per unit of time.
  • the sample gas taken from the probe 5 flows through a sample gas line 10 and a valve 11 into a mixing chamber 25, where it is mixed with synthetic air, which is taken from a bottle 18 and through a preliminary Pressure control valve 15, a clean air control valve 14 and a clean air line 19 flows into the mixing chamber 25.
  • the sample gas diluted with pure air, the measuring gas is conveyed to collecting bags 23 by a pump 22 through a back pressure regulator 20, which keeps the pressure in the mixing chamber 25 constant.
  • the sample gas samples from different phases of an exhaust gas test are successively filled into various collecting bags.
  • Sample gas and clean air are mixed in such a ratio that no water vapor condenses at the ambient temperature of the bags 23, ie, as little air as possible is supplied.
  • the ratio depends essentially on the type of fuel used and remains constant at least during the testing of an engine.
  • the sample gas and the clean air standard volume flow are set in such a way that the ratio remains constant.
  • the system works in such a way that the standard volume flow of the sample gas in the sample gas line 24 and thus also the sample gas in line 10 and the clean air in line 19 are proportional to the standard volume flow of the exhaust gas in line 4. This can be achieved by calculating the sample gas standard volume flow to be set from the current standard exhaust gas volume flow. This in turn is made up of the sample gas flow and the clean air flow.
  • a sample standard volume flow and a clean air standard volume flow are determined from the sample gas standard volume flow.
  • the standard volume flow target values are calculated. Valves 11 and 14 are controlled with these values.
  • the control unit 9 depending on the determined exhaust gas standard volume flow, sends control signals to the valves 11 and 14, which cause the proportional change in the standard volume flows of the sample gas and the clean air, since the pressure in the mixing chamber 25 by means of a pressure sensor 21 and the back pressure control valve 20 is kept constant, as the gas flowing into the mixing chamber 25 is fed directly to the collecting bags 23 as measuring gas.
  • the speed of the sample gas feed pump 22 is set in accordance with the current exhaust gas standard volume flow.
  • the control system for the valves is designed in a forward-thinking manner, for example by B. enters into the setpoint of the sample gas standard volume flow or in the sample gas standard volume flow a differential portion of the exhaust gas volume flow. This means that if the exhaust gas volume flow changes very strongly, the target value for the sample gas standard volume flow is increased or decreased, since it can be expected that the exhaust gas standard volume flow will already have reached the supposedly correct valve setting has risen or fallen.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Pour mesurer la concentration en polluants de gaz brûlés, notamment si ces gaz sont recueillis avant analyse, lesdits gaz sont raréfiés avec de l'air afin que la vapeur d'eau qu'ils contiennent ne se condense pas et que les valeurs mesurées ne soient pas faussées. Selon l'invention, un échantillon des gaz d'échappement à analyser est prélevé et est raréfié avec de l'air de synthèse. Le courant de gaz d'échantillonnage est piloté ou régulé de manière à ce que le rapport des gaz d'échantillonnage au courant de gaz d'échappement soit constant. Le rapport du courant d'air de synthèse au courant de gaz d'échantillonnage ou au courant de gaz d'échappement est également maintenu constant. L'invention s'utilise dans le cadre des mesures de pollutions émanant de moteurs à combustion interne.
EP95910436A 1994-07-11 1995-03-02 Procede et systeme permettant de traiter des gaz brules, notamment des gaz d'echappement de moteurs a combustion interne Ceased EP0770215A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19944424370 DE4424370A1 (de) 1994-07-11 1994-07-11 Verfahren und Anordnung zum Aufbereiten von Abgasen, insbesondere von Verbrennungsmotoren
DE4424370 1994-07-11
PCT/DE1995/000278 WO1996001998A1 (fr) 1994-07-11 1995-03-02 Procede et systeme permettant de traiter des gaz brules, notamment des gaz d'echappement de moteurs a combustion interne

Publications (1)

Publication Number Publication Date
EP0770215A1 true EP0770215A1 (fr) 1997-05-02

Family

ID=6522820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95910436A Ceased EP0770215A1 (fr) 1994-07-11 1995-03-02 Procede et systeme permettant de traiter des gaz brules, notamment des gaz d'echappement de moteurs a combustion interne

Country Status (3)

Country Link
EP (1) EP0770215A1 (fr)
DE (1) DE4424370A1 (fr)
WO (1) WO1996001998A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6200819B1 (en) * 1995-09-29 2001-03-13 Horiba Instruments, Inc. Method and apparatus for providing diluent gas to exhaust emission analyzer
JP3606499B2 (ja) * 1996-11-13 2005-01-05 株式会社堀場製作所 化学発光法分析計のサンプル希釈方法
US5846831A (en) * 1997-04-01 1998-12-08 Horiba Instuments, Inc. Methods and systems for controlling flow of a diluted sample and determining pollutants based on water content in engine exhaust emissions
US6505524B1 (en) * 1998-07-13 2003-01-14 Horiba Instruments, Inc. Mixing system and method
ATE304703T1 (de) 2003-05-14 2005-09-15 Pierburg Instr Gmbh Verfahren und vorrichtung zur abgasmessung von verbrennungskraftmaschinen
DE102005013914A1 (de) * 2005-03-24 2006-07-20 Siemens Ag Vorrichtung zur Druckmessung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3817100A (en) * 1972-11-03 1974-06-18 Ford Motor Co Critical flow venturi
US4586367A (en) * 1984-03-19 1986-05-06 Horiba Instruments Incorporated Proportional exhaust sampler and control means
AT391556B (de) * 1989-03-13 1990-10-25 Avl Verbrennungskraft Messtech Verfahren und einrichtung zur stetigen entnahme einer teilmenge aus einem gasstrom
EP0428850B1 (fr) * 1989-09-29 1995-08-23 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Système de dilution utilisant un diviseur de débit à conduites multiples
AT393173B (de) * 1990-08-14 1991-08-26 Steyr Nutzfahrzeuge Anlage zur schadstoffanalyse, insbesondere partikelemission, von dieselmotorenabgas, mit einer speziellen teilstromverduennungseinrichtung
US5337595A (en) * 1992-03-18 1994-08-16 Horiba Instruments, Incorporated Subsonic venturi proportional and isokinetic sampling methods and apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9601998A1 *

Also Published As

Publication number Publication date
WO1996001998A1 (fr) 1996-01-25
DE4424370A1 (de) 1996-04-18

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