DE19743954C2 - Cold start measuring system for measuring the cold start emission - Google Patents
Cold start measuring system for measuring the cold start emissionInfo
- Publication number
- DE19743954C2 DE19743954C2 DE19743954A DE19743954A DE19743954C2 DE 19743954 C2 DE19743954 C2 DE 19743954C2 DE 19743954 A DE19743954 A DE 19743954A DE 19743954 A DE19743954 A DE 19743954A DE 19743954 C2 DE19743954 C2 DE 19743954C2
- Authority
- DE
- Germany
- Prior art keywords
- cold start
- motor vehicle
- measuring system
- cuvette
- emission
- 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.)
- Expired - Fee Related
Links
- 239000002245 particle Substances 0.000 claims description 8
- 239000004071 soot Substances 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 3
- 229910000906 Bronze Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010974 bronze Substances 0.000 claims description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims 1
- 238000013021 overheating Methods 0.000 claims 1
- 229930195733 hydrocarbon Natural products 0.000 description 10
- 150000002430 hydrocarbons Chemical class 0.000 description 10
- 239000003054 catalyst Substances 0.000 description 9
- 239000003344 environmental pollutant Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 230000003197 catalytic effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000011001 backwashing Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
- G01M15/108—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using optical methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
Description
Das hier beschriebene Kaltstartmeßsystem zur Schadstoffmessung im Kraftfahrzeug während der Kaltstartphase geht auf den in DE 197 36 864.6 "Vorrichtung zur Analyse des Abgases von Kraftfahrzeugen" beschriebenen Gegenstand zurück.The cold start measuring system described here for measuring pollutants in the motor vehicle during the cold start phase is based on the device for analyzing the exhaust gas in DE 197 36 864.6 Motor vehicles "object described back.
In den ersten Sekunden des Kraftfahrzeugbetriebes, wenn der Katalysator seine Betriebstemperatur noch nicht erreicht hat, ist die Schadstoffminderung des Abgases durch den Katalysator, die sogenannte Konvertierungsrate, noch sehr niedrig. Da der Motor in der Kaltstartphase etwa 70% seiner gesamten Emissionen produziert, wäre jedoch eine optimale Schadstoffminderung gerade in dieser Phase wünschenswert. Ganz besonders muß das Konvertierungsverhalten für die unverbrannten Kohlenwasserstoffe (HC) verbessert werden.In the first few seconds of motor vehicle operation when the catalytic converter is its Has not yet reached operating temperature, the exhaust gas is reduced by the Catalyst, the so-called conversion rate, is still very low. Since the engine in the Cold start phase would produce around 70% of its total emissions, but would be an optimal one Pollutant reduction desirable in this phase. It has to be especially Conversion behavior for unburned hydrocarbons (HC) can be improved.
Im Hinblick auf die strengen US-Grenzwerte werden Maßnahmen notwendig, um eine hohe Konvertierungsrate auch beim Kaltstart zu gewährleisten. Die von der US-Regierung favorisierten Schlagwörter für die einzelnen Stufen zur Einführung abgasarmer Fahrzeuge sind Transitional-Low-Emission Vehicles TLEV, Low-Emission Vehicles LEV und Ultra-Low- Emission Vehicles ULEV.In view of the strict US limits, measures are necessary to achieve a high level To ensure conversion rate even on cold start. That from the US government are favorite keywords for the individual stages for the introduction of low-emission vehicles Transitional-Low-Emission Vehicles TLEV, Low-Emission Vehicles LEV and Ultra-Low- Emission vehicles ULEV.
Eine Möglichkeit zur Schadstoffreduzierung ist die Integration einer elektrischen Heizung im Katalysator, die während der Start- und Warmlaufphase den Katalysator beheizt. Bei Metallträger-Katalysatoren wird der Metallkörper als elektrischer Widerstand zum Heizen verwendet. Auch bei einem Katalysator mit Keramikträger ist die Beheizung durch Vorschalten eines elektrischen Heizkörpers möglich.One option for reducing pollutants is the integration of an electric heater in the Catalytic converter that heats the catalytic converter during the start-up and warm-up phase. At Metal support catalysts use the metal body as an electrical resistor for heating used. In the case of a catalytic converter with a ceramic carrier, heating is also possible by switching upstream an electric radiator possible.
Bei einer anderen Technik wird Kraftstoff in den Katalysator gespritzt und verbrannt. Bei dieser Methode erreichen der Katalysator und die Lambda-Sonde nach wenigen Sekunden die Betriebstemperatur.Another technique injects fuel into the catalytic converter and burns it. At this The catalyst and the lambda probe reach the method after a few seconds Operating temperatur.
Eine bessere Möglichkeit ist die Adsorption von HC während der ersten Sekunden nach dem Start (HC-Falle). Die Desorption erfolgt dann, wenn der Katalysator eine Temperatur erreicht hat, bei der eine zufriedenstellende Konvertierung gesichert ist Untersuchungen zeigen, daß mit diesem Verfahren eine Verringerung der HC-Emission von bis zu 50% möglich ist. A better option is to adsorb HC during the first few seconds after Start (HC trap). Desorption occurs when the catalyst reaches a temperature with a satisfactory conversion is assured Studies show that With this method, a reduction in HC emissions of up to 50% is possible.
In DE 41 21 520 A1 wird eine berührungslos arbeitende Schaltungsordnung zum Vorwärmen von Zündeinrichtungen beschrieben. Dieses Gerät funktioniert über einen Infrarotsensor mit Bewegungsmelder und tastet die Anwesenheit einer Person auf dem Fahrersitz ab. In der vorliegenden Anmeldung ist die Zusammenführung verschiedener Abläufe das entscheidende Merkmal. Die frühzeitige Erkennung durch einen Sitzbelegungsensor, das folgende, elektrische Vorheizen des Katalysators bzw. das Einspritzen von Kraftstoff in den Katalysator und die Einschaltung der HC-Falle. Um diese Vorgänge optimal zu verbinden und flexibel auf die verschiedene Betriebsbedingungen zu reagieren, ist ein Kaltstart Meßsystem entwickelt worden.DE 41 21 520 A1 describes a non-contact circuit arrangement for preheating described by ignition devices. This device works with an infrared sensor Motion detector and senses the presence of a person in the driver's seat. In the present application, the merging of different processes is that crucial feature. The early detection by a seat occupancy sensor that following electrical preheating of the catalyst or the injection of fuel into the Catalyst and the activation of the HC trap. To optimally combine these processes and A cold start measuring system is to react flexibly to the different operating conditions has been developed.
In DE 196 05 053 A1 wird ein Verfahren und eine Vorrichtung im Mikromeßstab zur kontinuierlichen Messung des Schadstoffaustrages aus Kraftfahrzeugen dargestellt. In dieser Quelle wird allgemein über die Vorteile eines kontinuierlichen Meßverfahren in Kraftfahrzeugen gesprochen. Die spezielle Schadstoffmessung im Kraftfahrzeug während der Kaltstartphase wird nicht erwähnt.DE 196 05 053 A1 describes a method and a device on the micro dipstick continuous measurement of pollutant discharge from motor vehicles. In this Quelle is generally about the advantages of a continuous measurement method in motor vehicles spoken. The special pollutant measurement in the motor vehicle during the cold start phase is not mentioned.
Der Erfindung liegt die Aufgabe zu Grunde, ein Meßsystem zu beschreiben, das in der Lage ist, die tatsächliche Emission in der Kaltstartphase zu erfassen, um einen optimalen Betrieb zu ermöglichen und evtl. Fehler in der Technik zu signalisieren, und die Emissions- Minderungsanlage zu steuern.The invention is based on the object of describing a measuring system which is capable of to record the actual emission in the cold start phase in order to ensure optimal operation enable and to signal any errors in the technology, and the emission Control reduction system.
Die Messung der Kaltstartemission wird mit Hilfe eines Meßsystems vorgenommen, das nach dem Prinzip des NDIR-Photometers arbeitet. Dieses Meßsystem besteht im wesentlichen aus einem Strahler, einem Empfänger und einer optischen Küvette. Solche Meßsysteme sind weltweit bekannt.The measurement of the cold start emission is carried out with the aid of a measuring system, which according to works on the principle of the NDIR photometer. This measuring system essentially consists of a radiator, a receiver and an optical cuvette. Such measuring systems are worldwide known.
Als eine besondere Neuigkeit ist bei der vorliegenden Vorrichtung zu betrachten, daß die optische Küvette nicht wie üblich aus einem Rohr mit einer möglichst gut reflektierenden Innenwandung besteht, sondern aus einem porösen Material. Dieses Material kann z. B. Sinterstahl oder Sinterbronze oder ein anderes gesintertes Material sein, das es ermöglicht, das zu messende Gas durch Diffusion in das Küvettenrohr zu führen, s. Fig. 1. Herkömmliche Geräte verfügen über ein "Nicht"-poröses Küvettenrohr, in das das zu messende Gas durch eine externe Pumpe geführt wird. Dadurch benötigen diese Geräte eine aufwendige und somit kostspielige Gasaufbereitung, bestehend aus einer Tropfenabscheidevorrichtung, einer Pumpe, einem Druckminderer und einem Strömungsmesser.A particular novelty in the present device is that the optical cuvette does not consist, as usual, of a tube with an inner wall that reflects as well as possible, but of a porous material. This material can e.g. B. sintered steel or sintered bronze or another sintered material that allows the gas to be measured to be guided by diffusion into the cuvette tube, see. Fig. 1. Conventional devices have a "non-porous cuvette tube, into which the gas to be measured is fed by an external pump. As a result, these devices require complex and therefore costly gas treatment, consisting of a droplet separator, a pump, a pressure reducer and a flow meter.
Die Verwendung einer porösen Küvette aus Sintermaterial ist hingegen in der Kfz-Technik besonders vorteilhaft, da bei dieser Anordnung die Schmutz-, vor allem aber die Rußpartikel, an der als Filter wirkenden Siebschicht des Sintermaterials zurückgehalten werden. Das Entfernen der Ruß- und Schmutzpartikel könnte in gewissen Zeitabständen durch Rückspülen mit Druckluft erfolgen, s. Fig. 2. Das Rückspülen könnte z. B. mit Hilfe einer, an den Tankstellen benutzten, Druckluftvorrichtung erfolgen.The use of a porous cuvette made of sintered material, on the other hand, is particularly advantageous in automotive engineering, since with this arrangement the dirt particles, but above all the soot particles, are retained on the sieve layer of the sintered material which acts as a filter. The soot and dirt particles could be removed at certain intervals by backwashing with compressed air, see. Fig. 2. The backwashing could e.g. B. with the help of a, used at the gas stations, compressed air device.
In Fig. 1 sind die optischen Komponenten des Meßsystems dargestellt. Das poröse Küvettenrohr aus Sintermaterial (1), der Strahler (2) mit Reflektor (3) und der Detektor (4) mit einer Linse, (5) zum bündeln der infraroten Strahlung.In Fig. 1, the optical components of the measuring system are shown. The porous cuvette tube made of sintered material ( 1 ), the emitter ( 2 ) with reflector ( 3 ) and the detector ( 4 ) with a lens ( 5 ) for focusing the infrared radiation.
Die Fig. 2 soll das Rückspülen der Rußpartikel (9) mit Druckluft (8) erläutern. Die von außen kommende Druckluftleitung wird mit ihrer Anschlußkupplung (6) an den von außen am Kraftfahrzeug zugänglichen Einlaßstutzen (7) angekoppelt. Die Druckluft (8) entfernt dabei die an der Außenseite des Küvettenrohres (1) haftenden Rußpartikel (9). FIG. 2 is intended to illustrate the backwashing of the soot particles (9) with compressed air (8). The compressed air line coming from the outside is coupled with its connecting coupling ( 6 ) to the inlet connection ( 7 ) accessible from the outside of the motor vehicle. The compressed air ( 8 ) removes the soot particles ( 9 ) adhering to the outside of the cuvette tube ( 1 ).
Wie vorhergehend beschrieben, gibt es verschiedene Möglichkeiten einer Schadstoffminderung während der Kaltstartphase.As described above, there are various ways of reducing pollutants during the cold start phase.
Die einfachste Möglichkeit ist das Vorheizen des Katalysators vor dem Start. Erfolgt das Vorheizen des Katalysators elektrisch, so wird, bedingt durch die Masse und thermische Trägheit des Katalysators, der Akkumulator des Kraftfahrzeuges stark beansprucht. An kalten Wintertagen und bei nicht ganz neuen, bzw. nicht vollgeladenen Akkumulatoren entsteht die Situation, daß der Wagen nach dem Vorheizen nicht mehr gestartet werden kann. The easiest way is to preheat the catalyst before starting. Does that happen Preheating the catalyst electrically, it is due to the mass and thermal Inertia of the catalyst, the accumulator of the motor vehicle is heavily used. On cold Winter days and in the case of not completely new or not fully charged accumulators Situation that the car can no longer be started after preheating.
Eine bessere Möglichkeit zur Schadstoffminderung ist der Einsatz von HC-Fallen. Um jedoch eine hohe Effizienz einer solchen HC-Falle zu ermöglichen, ist es unbedingt notwendig, die Kohlenwasserstoffkonzentration im Abgas zu messen.A better way to reduce pollutants is to use HC traps. However, to To enable a high efficiency of such an HC trap, it is imperative that Measure the hydrocarbon concentration in the exhaust gas.
Da das Kaltstart-Meßsystem nur einen geringen Energiebedarf hat, kann es bereits vor der Kaltstartphase in Betrieb genommen werden. Dazu scheinen z. B. ein Sitzbelegungssensor (10) oder andere Sensoren im Kraftfahrzeug geeignet zu sein, um bereits beim Einsteigen in das Kraftfahrzeug das Kaltstart Meßsystem zu aktivieren, siehe Fig. 3. Gleichzeitig könnte auch die HC-Falle eingeschaltet werden.Since the cold start measuring system has only a low energy requirement, it can be put into operation before the cold start phase. For this seem z. B. a seat occupancy sensor ( 10 ) or other sensors in the motor vehicle to be suitable for activating the cold start measuring system when entering the motor vehicle, see FIG. 3. At the same time the HC trap could also be switched on.
Eine besonders günstige Möglichkeit für die Unterbringung des Kaltstart-Meßsystems ist ein zylinderförmiger Behälter (12) als Zwischenstück des Auspuffrohres (11), ähnlich zu einem Katalysator oder einem Schaltdämpfer. Mögliche Ausbildungsformen zeigt die Fig. 4. In diesem, an den letzten Schalldämpferkasten angeschlossenen, Zylinder befindet sich die aus dem gesinterten Rohrmaterial bestehende optische Küvette sowie die elektronische Schaltung für die Meßdatenerfassung.A particularly favorable option for accommodating the cold start measuring system is a cylindrical container ( 12 ) as an intermediate piece of the exhaust pipe ( 11 ), similar to a catalytic converter or a switching damper. Fig. 4 shows possible forms of training . In this cylinder, which is connected to the last silencer box, there is the optical cuvette consisting of the sintered tube material and the electronic circuit for the measurement data acquisition.
Da das Kaltstart-Meßsystem als letztes Element an das Abgasbehandlungssystem des Kraftfahrzeuges angeschlossen wird, ist das zu messende Gas selbst nach längeren Fahrten, nach einer Fahrt mit höherer Geschwindigkeit oder an warmen Sommertagen bereits so kühl, daß die optische Vorrichtung ohne besondere Schutzmaßnahmen direkt im Gasweg installiert werden kann. Since the cold start measuring system as the last element to the exhaust gas treatment system of the Connected to the vehicle, the gas to be measured is even after long journeys, so cool after driving at higher speeds or on warm summer days, that the optical device is installed directly in the gas path without special protective measures can be.
11
Küvettenrohr aus Sintermaterial
Cell tube made of sintered material
22nd
Strahler
Spotlights
33rd
Reflektor
reflector
44th
Detektor
detector
55
Linse
lens
66
Anschlußkupplung
Connection coupling
77
Einlaßstutzen
Inlet connector
88th
Druckluft
Compressed air
99
Rußpartikel
Soot particles
1010th
Sitzbelegungssensor
Seat occupancy sensor
1111
Auspuffrohr
Exhaust pipe
1212th
Zylinderförmiger Behälter
Cylindrical container
Claims (4)
Priority Applications (22)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19743954A DE19743954C2 (en) | 1997-10-04 | 1997-10-04 | Cold start measuring system for measuring the cold start emission |
| PT98115926T PT909941E (en) | 1997-08-25 | 1998-08-24 | DEVICE FOR ANALYSIS OF AUTOMATIC VEHICLE EXHAUST GASES |
| PCT/DE1998/002494 WO1999010728A2 (en) | 1997-08-25 | 1998-08-24 | Device for analysing exhaust emissions from motor vehicles |
| JP51378899A JP3516691B2 (en) | 1997-08-25 | 1998-08-24 | Equipment for analyzing exhaust emissions from motor vehicles |
| BR9811356-9A BR9811356A (en) | 1997-08-25 | 1998-08-24 | Device for analyzing the exhaust gas of motor vehicles. |
| DK98115926T DK0909941T3 (en) | 1997-08-25 | 1998-08-24 | Infrared analysis of motor vehicle exhaust with zero point adjustment or correction for temperature operation |
| AT98115926T ATE202417T1 (en) | 1997-08-25 | 1998-08-24 | INFRARED MOTOR VEHICLE EMISSION ANALYSIS WITH ZERO POINT ADJUSTMENT OR TEMPERATURE DRIFT CORRECTION |
| AU90461/98A AU9046198A (en) | 1997-08-25 | 1998-08-24 | Device for analysing exhaust emissions from motor vehicles |
| RU2000104000/28A RU2180107C2 (en) | 1997-08-25 | 1998-08-24 | Automobile exhaust-gas analyzer |
| EP98115926A EP0909941B1 (en) | 1997-08-25 | 1998-08-24 | Infrared analysis of motor vehicle exhaust with zero point adjustment or correction of temperature drift |
| ES98115926T ES2157629T3 (en) | 1997-08-25 | 1998-08-24 | INFRARED ANALYSIS OF EXHAUST GASES OF MOTOR VEHICLES WITH ADJUSTMENT OF THE ZERO POINT OR CORRECTION OF THE INFLUENCE OF THE TEMPERATURE. |
| NZ502545A NZ502545A (en) | 1997-08-25 | 1998-08-24 | Infrared cell analysis of exhaust emissions with clean air calibration pump |
| CA002306483A CA2306483A1 (en) | 1997-08-25 | 1998-08-24 | Device for the analysis of motor vehicles exhaust emissions |
| US09/486,579 US6439040B1 (en) | 1997-08-25 | 1998-08-24 | Device for analyzing exhaust emissions from motor vehicles |
| EP98952506A EP1007945A2 (en) | 1997-08-25 | 1998-08-24 | Device for analysing exhaust emissions from motor vehicles |
| CN98807663.2A CN1265191A (en) | 1997-08-25 | 1998-08-24 | Device for analysing exhaust emissions from motor vehicles |
| KR10-2000-7000848A KR100372381B1 (en) | 1997-08-25 | 1998-08-24 | device for analysing exhaust emissions from motor vehicles |
| DE59800882T DE59800882D1 (en) | 1997-08-25 | 1998-08-24 | Infrared motor vehicle exhaust gas analysis with zero point adjustment or temperature drift correction |
| TR2000/00507T TR200000507T2 (en) | 1997-08-25 | 1998-08-24 | Instrument for the analysis of motor vehicle exhaust emissions |
| GR20010400965T GR3036115T3 (en) | 1997-08-25 | 2001-06-22 | Apparatus for analysing motor vehicles exhaust |
| CN01132597.6A CN1338625A (en) | 1997-08-25 | 2001-09-07 | Automotive exhaust analyzing device |
| HK02103218.8A HK1044587A1 (en) | 1997-08-25 | 2002-04-30 | Device for analysing exhaust emissions from motor vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19743954A DE19743954C2 (en) | 1997-10-04 | 1997-10-04 | Cold start measuring system for measuring the cold start emission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE19743954A1 DE19743954A1 (en) | 1999-06-02 |
| DE19743954C2 true DE19743954C2 (en) | 2000-10-12 |
Family
ID=7844640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19743954A Expired - Fee Related DE19743954C2 (en) | 1997-08-25 | 1997-10-04 | Cold start measuring system for measuring the cold start emission |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE19743954C2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017117709A1 (en) | 2017-08-04 | 2019-02-21 | Carl Zeiss Jena Gmbh | Pattern-based spectroscopic gas quality monitoring |
| CN117388201B (en) * | 2023-12-08 | 2024-03-08 | 至芯半导体(杭州)有限公司 | Gas concentration detection method and system |
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-
1997
- 1997-10-04 DE DE19743954A patent/DE19743954C2/en not_active Expired - Fee Related
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|---|---|---|---|---|
| EP0138152A2 (en) * | 1983-10-18 | 1985-04-24 | Ab Leo | Cuvette |
| US4709150A (en) * | 1986-03-18 | 1987-11-24 | Burough Irvin G | Method and apparatus for detecting gas |
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| DE4235225A1 (en) * | 1992-10-13 | 1994-06-09 | Iris Gmbh Infrared & Intellige | Sensor arrangement for monitoring the conversion rate of an exhaust gas catalytic converter |
| DE4235225C2 (en) * | 1992-10-13 | 1994-11-10 | Iris Gmbh Infrared & Intellige | Sensor arrangement and method for monitoring the conversion rate of an exhaust gas catalytic converter |
| DE4330997A1 (en) * | 1993-09-13 | 1995-03-16 | Bosch Gmbh Robert | Method for monitoring the light-off performance of a catalytic converter system in a motor vehicle |
| US5475223A (en) * | 1994-04-25 | 1995-12-12 | Ford Motor Company | System for monitoring exhaust gas composition |
| DE19605053A1 (en) * | 1995-03-10 | 1996-09-26 | Palocz Andresen Michael Dr Ing | On board diagnostic system for motor vehicle IC engine |
| DE19540943A1 (en) * | 1995-11-03 | 1997-05-07 | Bosch Gmbh Robert | Method for checking vehicle subsystems in motor vehicles |
| DE19541903A1 (en) * | 1995-11-10 | 1997-05-15 | Bayerische Motoren Werke Ag | Monitoring system for the exhaust gas purification of an internal combustion engine |
| DE19709197A1 (en) * | 1996-03-07 | 1997-10-30 | Whitaker Corp | Sensor apparatus of seat occupant detection system used in motor vehicle |
| DE19616571A1 (en) * | 1996-04-25 | 1997-10-30 | Paul Schreiber | Measuring cuvette, e.g. for spectral photometers or colour meters |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19743954A1 (en) | 1999-06-02 |
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