DE3809082A1 - Method for analysing a plurality of gas samples at least approximately simultaneously - Google Patents

Method for analysing a plurality of gas samples at least approximately simultaneously

Info

Publication number
DE3809082A1
DE3809082A1 DE3809082A DE3809082A DE3809082A1 DE 3809082 A1 DE3809082 A1 DE 3809082A1 DE 3809082 A DE3809082 A DE 3809082A DE 3809082 A DE3809082 A DE 3809082A DE 3809082 A1 DE3809082 A1 DE 3809082A1
Authority
DE
Germany
Prior art keywords
gas samples
exhaust gas
samples
analysing
analysis
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Withdrawn
Application number
DE3809082A
Other languages
German (de)
Inventor
Horst Prof Dr Klingenberg
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.)
Volkswagen AG
Original Assignee
Volkswagen 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 Volkswagen AG filed Critical Volkswagen AG
Priority to DE3809082A priority Critical patent/DE3809082A1/en
Publication of DE3809082A1 publication Critical patent/DE3809082A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • 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
    • G01N33/0026—General constructional details of gas analysers, e.g. portable test equipment use of an alternating circulation of another gas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

For the purpose of reducing the device costs in the approximately simultaneous analysis of a plurality of gas samples, especially exhaust gas samples before and after a catalytic convertor (1), the samples are fed via a multiport valve (5) to a single analyser (6) in time-multiplex fashion. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Patentanspruchs.The invention relates to a method according to the preamble of the claim.

Der bevorzugte Einsatzfall der Erfindung ist die Kontrolle des ordnungsgemäßen Arbeitens eines Katalysators, der in das Abgassystem einer ein Kraftfahrzeug antreibenden Brennkraftmaschine eingeschaltet ist. Es ist bekannt, daß man durch Vergleichen der Abgaszusammensetzungen vor und hinter dem Katalysator, insbesondere der Komponenten HC, CO und NO x , eine eindeutige Aussage über den Zustand des Katalysators machen kann. Dabei muß das angewendete Verfahren relativ einfach sein, da der Zustand des Katalysators gegebenenfalls in kurzer Zeit in einer Werkstatt feststellbar sein muß, also die Verhältnisse in einer Fabrik nicht vorliegen.The preferred application of the invention is to check the proper functioning of a catalytic converter which is connected to the exhaust system of an internal combustion engine driving a motor vehicle. It is known that by comparing the exhaust gas compositions in front of and behind the catalytic converter, in particular the components HC, CO and NO x , it is possible to make a clear statement about the condition of the catalytic converter. The method used must be relatively simple, since the condition of the catalytic converter may have to be ascertainable in a workshop in a short time, that is to say the conditions in a factory are not present.

Bekannte Einrichtungen zur Lösung dieser Aufgabe enthalten zwei Analysengeräte, von denen eines mit dem Abgas vor dem Katalysator und eines mit dem Abgas hinter dem Katalysator gespeist wird. Abgesehen davon, daß beide Analysengeräte, die also jeweils drei Meßkanäle für die einzelnen Abgaskomponenten enthalten, zwecks Vermeidung von Fehlern bei der Bedienung des Katalysatorzustands innerhalb eines engen Toleranzbereichs arbeiten müssen, erkauft diese bekannte Lösung den Vorteil einer gleichzeitigen Messung der Abgaszusammensetzungen vor und hinter dem Katalysator aber mit einem relativ großen Geräteaufwand.Known devices for solving this task contain two analysis devices, one with the exhaust gas in front of the catalytic converter and one with the exhaust gas behind the catalyst is fed. Apart from the fact that both analyzers, the So each contain three measuring channels for the individual exhaust gas components Avoidance of errors when operating the catalytic converter inside have to work within a narrow tolerance range, buy this known solution the advantage of a simultaneous measurement of the exhaust gas compositions before and behind the catalyst but with a relatively large amount of equipment.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren gemäß dem Oberbegriff des Patentanspruchs zu schaffen, das mit erheblich geringerem Aufwand an Analysen­ geräten, nämlich einem einzigen, auskommt, ohne daß der Vorteil der hinreichend zeitgleichen Analyse der verschiedenen Abgasproben aufgegeben werden muß.The invention has for its object a method according to the preamble of the claim to create that with significantly less effort in analysis  devices, namely a single, does without the advantage of being sufficient simultaneous analysis of the different exhaust gas samples must be given up.

Die erfindungsgemäße Lösung dieser Aufgabe besteht in den kennzeichnenden Merkmalen des Patentanspruchs.The achievement of this task consists in the characteristic features of the claim.

Durch die erfindungsgemäße Anwendung des an sich für andere Aufgaben bekannten Zeitmultiplexverfahrens ist es also im bevorzugten Einsatzfall, nämlich zur Überprüfung eines Katalysators, möglich, mittels eines einzigen Dreikomponenten- Analysengeräts eine einwandfreie Aussage über den Zustand des Katalysators zu gewinnen. Dabei wird durch Berücksichtigung der Gaslaufzeiten in dem Analysengerät eine ungestörte Messung sichergestellt.The inventive use of the known for other tasks It is time-division multiplexing in the preferred application, namely for Checking of a catalyst, possible, using a single three-component Analyzer a perfect statement about the condition of the catalyst win. This is done by taking into account the gas transit times in the analyzer an undisturbed measurement ensured.

Das erfindungsgemäße Verfahren wird im folgenden anhand der Zeichnung erläutert, die eine mögliche Testanordnung zur Überprüfung des Katalysators in der Abgaslei­ tung einer Brennkraftmaschine zeigt.The method according to the invention is explained below with reference to the drawing, a possible test arrangement for checking the catalyst in the exhaust gas tion of an internal combustion engine shows.

In den bezüglich der durch Pfeile angedeuteter Strömungsrichtung vor und hinter dem Katalysator 1, der einen beliebigen bekannten Aufbau haben kann, an der Abgasleitung 2 der im übrigen nicht dargestellten Brennkraftmaschine angeordneten Abzweigleitungen 3 und 4 werden Abgasproben in durch die Betätigung des Dreiwege­ ventils 5 bestimmter zeitlicher Folge dem Analysengerät 6 zugeführt, das beispiels­ weise ein Dreikomponenten-Meßgerät für HC, CO und NO x ist. Dabei ist die Schaltge­ schwindigkeit des Dreiwegeventils 5, das elektrisch oder pneumatisch betätigt werden kann, so gewählt, daß unter Berücksichtigung der Gaslaufzeiten in dem Analysengerät 6 eine einwandfreie Analyse der einzelnen Gasproben erfolgt. Das Analysengerät kann ferner ein Steuergerät für einen nachgeschalteten Schrittmotor 7 darstellen, der zur Änderung des Kraftstoff-Luft-Gemischs der Brennkraftmaschine dient, so daß die Analyse bei verschiedenen Luftzahlen erfolgen kann. In diesem Falle wird man dem Gerät 6 auch Drehzahlsignale n eines Drehzahlsensors der Brennkraftmaschine zuführen.In the flow direction indicated by arrows in front of and behind the catalytic converter 1 , which may have any known structure, on the exhaust line 2 of the branching lines 3 and 4, which are not shown in the rest of the internal combustion engine, exhaust gas samples are determined in time by the actuation of the three-way valve 5 Follow the analyzer 6 , which is, for example, a three-component measuring device for HC, CO and NO x . The Schaltge speed of the three-way valve 5 , which can be actuated electrically or pneumatically, is chosen so that, taking into account the gas run times in the analyzer 6, a perfect analysis of the individual gas samples takes place. The analysis device can also represent a control device for a downstream stepper motor 7 , which serves to change the fuel-air mixture of the internal combustion engine, so that the analysis can be carried out at different air ratios. In this case, the device 6 will also be supplied with speed signals n of a speed sensor of the internal combustion engine.

Betrachtet man ein von dem Analysengerät 6 geliefertes Meßprotokoll für jeweils eine erfaßte Abgaskomponente, so folgen die Meßergebnisse für die einzelnen, über die Leitungen 3 und 4 zugeführten Proben zeitlich periodisch aufeinander.If one considers a measurement protocol supplied by the analysis device 6 for one exhaust gas component recorded in each case, the measurement results for the individual samples supplied via the lines 3 and 4 follow one another periodically in time.

Mit der Erfindung ist demgemäß ein Verfahren zur hinreichend zeitgleichen Analyse mehrerer Gasproben geschaffen, das in vorteilhafter Weise ohne Einbußen an Meßge­ nauigkeit mit minimalem Aufwand auskommt.Accordingly, the invention provides a method for a sufficiently simultaneous analysis created several gas samples, which advantageously without sacrificing Meßge accuracy requires minimal effort.

Claims (1)

Verfahren zur zumindest annähernd zeitgleichen Analyse mehrerer Gasproben, ins­ besondere Abgasproben einer Brennkraftmaschine, dadurch gekennzeichnet, daß die Gasproben in vorgegebener zeitlicher Folge einem einzigen Analysengerät (6) über ein Mehrwegeventil (5) zugeführt werden, das mit einer die Gaslaufzeiten in dem Analysengerät (6) berücksichtigenden Frequenz umschaltet.Method for the at least approximately simultaneous analysis of several gas samples, in particular exhaust gas samples from an internal combustion engine, characterized in that the gas samples are supplied in a predetermined time sequence to a single analysis device ( 6 ) via a multi-way valve ( 5 ), which uses a gas flow time in the analysis device ( 6 ) takes into account the frequency.
DE3809082A 1987-03-30 1988-03-18 Method for analysing a plurality of gas samples at least approximately simultaneously Withdrawn DE3809082A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE3809082A DE3809082A1 (en) 1987-03-30 1988-03-18 Method for analysing a plurality of gas samples at least approximately simultaneously

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3710531 1987-03-30
DE3809082A DE3809082A1 (en) 1987-03-30 1988-03-18 Method for analysing a plurality of gas samples at least approximately simultaneously

Publications (1)

Publication Number Publication Date
DE3809082A1 true DE3809082A1 (en) 1988-10-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE3809082A Withdrawn DE3809082A1 (en) 1987-03-30 1988-03-18 Method for analysing a plurality of gas samples at least approximately simultaneously

Country Status (1)

Country Link
DE (1) DE3809082A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3923737A1 (en) * 1989-07-18 1991-01-24 Gutmann Messtechnik Ag METHOD AND DEVICE FOR MEASURING EXHAUST GAS VALUES IN MOTOR VEHICLES
DE4032721A1 (en) * 1990-10-15 1992-04-16 Emitec Emissionstechnologie MONITORING THE FUNCTION OF A CATALYZER FLOWING FROM A CATALYZABLE FLUID
WO1999025965A1 (en) * 1997-11-14 1999-05-27 Engelhard Corporation VEHICULAR ON-BOARD MONITORING SYSTEM SENSING COMBINED HC/NOx EMISSIONS FOR CATALYTIC CONVERTER EVALUATION
DE10148803A1 (en) * 2001-10-02 2003-04-24 Wissenschaftliche Werkstatt Fu Process for reducing the fuel consumption and thus pollutant emissions and exhaust gases in vehicles, comprises using a measuring system to determine the concentration of important components and the pressure, temperature and mass stream
WO2015170980A1 (en) * 2014-05-09 2015-11-12 Stichting Energieonderzoek Centrum Nederland Gas component concentration measurement device and method for gas component concentration measurement

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3923737A1 (en) * 1989-07-18 1991-01-24 Gutmann Messtechnik Ag METHOD AND DEVICE FOR MEASURING EXHAUST GAS VALUES IN MOTOR VEHICLES
US5105651A (en) * 1989-07-18 1992-04-21 Gutmann Messtechnik Ag Method of and apparatus for analyzing exhaust gases of motor vehicles
DE4032721A1 (en) * 1990-10-15 1992-04-16 Emitec Emissionstechnologie MONITORING THE FUNCTION OF A CATALYZER FLOWING FROM A CATALYZABLE FLUID
US5355671A (en) * 1990-10-15 1994-10-18 Emitec Gesellschaft Fur Emmissionstechnologie mbH Method and apparatus for monitoring the function of a catalytic converter
WO1999025965A1 (en) * 1997-11-14 1999-05-27 Engelhard Corporation VEHICULAR ON-BOARD MONITORING SYSTEM SENSING COMBINED HC/NOx EMISSIONS FOR CATALYTIC CONVERTER EVALUATION
DE10148803A1 (en) * 2001-10-02 2003-04-24 Wissenschaftliche Werkstatt Fu Process for reducing the fuel consumption and thus pollutant emissions and exhaust gases in vehicles, comprises using a measuring system to determine the concentration of important components and the pressure, temperature and mass stream
WO2015170980A1 (en) * 2014-05-09 2015-11-12 Stichting Energieonderzoek Centrum Nederland Gas component concentration measurement device and method for gas component concentration measurement
NL2012788B1 (en) * 2014-05-09 2016-02-24 Stichting Energieonderzoek Centrum Nederland Gas component concentration measurement device and method for gas component concentration measurement.
US10274457B2 (en) 2014-05-09 2019-04-30 Stichting Energieonderzoek Centrum Nederland Gas component concentration measurement device and method for gas component concentration measurement

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