DE3127038A1 - Method for avoiding states of non-equilibrium in the exhaust gases of internal combustion engines - Google Patents

Method for avoiding states of non-equilibrium in the exhaust gases of internal combustion engines

Info

Publication number
DE3127038A1
DE3127038A1 DE19813127038 DE3127038A DE3127038A1 DE 3127038 A1 DE3127038 A1 DE 3127038A1 DE 19813127038 DE19813127038 DE 19813127038 DE 3127038 A DE3127038 A DE 3127038A DE 3127038 A1 DE3127038 A1 DE 3127038A1
Authority
DE
Germany
Prior art keywords
equilibrium
states
alternating current
exhaust gases
internal combustion
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
Application number
DE19813127038
Other languages
German (de)
Other versions
DE3127038C2 (en
Inventor
Dieter 7251 Weissach Lehmann
Harald Dr. 7016 Gerlingen Reber
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE19813127038 priority Critical patent/DE3127038A1/en
Priority to JP11875682A priority patent/JPS5815736A/en
Publication of DE3127038A1 publication Critical patent/DE3127038A1/en
Application granted granted Critical
Publication of DE3127038C2 publication Critical patent/DE3127038C2/de
Granted legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1408—Dithering techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/281—Interface circuits between sensors and control unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/286—Interface circuits comprising means for signal processing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/021—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using an ionic current sensor

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing Of Engines (AREA)

Abstract

A method is proposed by means of which states of non-equilibrium in the exhaust gases, particularly in diesel engines, can be avoided. A limit current probe acted upon by a measuring voltage is arranged in the exhaust pipe downstream of the exhaust valve. Peak values of an alternating current signal occurring in the event of incomplete combustion are fed to a control unit for the purpose of setting optimum lambda values, which control unit acts on the fuel-air feed in such a way that the amplitude of the alternating current peak values is kept to a minimum with simultaneous minimum lambda value.

Description

Verfahren zur Vermeidung von ITichtgleichgewichtszuständenMethod for avoiding IT imbalance states

in Abgasen von Brennkraftmaschinen Stand der Technik Die Erfindung geht aus von einem Verfahren nach der Gattung des Hauptanspruchs. Nichtgleichgewichtszustände lassen sich z. B. durch die Bestimmung von unverbrannten Komponenten wie Kohlenmonoxid in sauerstoffhaltigen Gasen mittels Falbleitersensoren feststellen und durch entsprechende Gegensteuerung vermeiden. Hierzu ist jedoch die Entwicklung spezieller Sensoren notwendig, die möglichst nur auf eine der unverbrannten Komponenten ansprechen.in exhaust gases from internal combustion engines PRIOR ART The invention is based on a method according to the preamble of the main claim. Non-equilibrium states can be z. B. by determining unburned components such as carbon monoxide detect in oxygen-containing gases by means of leakage sensors and through appropriate Avoid countermeasures. However, this requires the development of special sensors necessary, which if possible only respond to one of the unburned components.

Vorteile der Erfindung Das erfindungsgemäße Verfahren mit den kennzeichnenden tIerkmalen des Anspruchs hat demgegenüber den Vorteil, daß es mit einer inzwischen entwicklungsmäßig ausgereiften Grenzstromsonde durchgeführt werden kann, wobei an sich bekannte elektronische Bauelemente und Schaltungen eingesetzt werden, um die Brennstoff-Luft-Zuführung zu optimieren.Advantages of the invention The method according to the invention with the characterizing tIerkmalen the claim has the advantage that it is now with a developmentally mature limit current probe can be carried out, with known electronic components and circuits are used to the Optimize fuel-air supply.

Bei laufendem Motor erreicht nach Öffnen des Auslaßventils eine im Auspuffsystem des Motors hinter diesem Auslaßventil angebrachte Grenzstromsonde eine Druck-onzentrationswelle der Gasmischung des verbrannten Zylinderinhalts. Die im Grenzstrombereich betriebene Sonde zeigt dann einen dem Sauerstoffgehalt proportionalen Grenzstrom an. Überraschenderweise hat sich gezeigt, daß nichtverbrannte Anteile, wie sie bei Betriebszuständen nahe der Laufgrenzen und des #= 1 - Punktes vorkommen,von der Grenzstromsonde bei dieser Anordnung nicht mit der gleichen Geschwindigkeit zur Gleichgewichtseinstellung gebracht werden wie die Diffusion zur Elektrode und die elektrochemische Umsetzung erfolgt, d. h. die Geschwindigkeit der Gleichgewichtseinstellung ist kleiner als die Geschwindigkeit der Diffusion des Gemisches zur Elektrode und der elektrochemischen Unsetzung. Solche Betriebszustände sind identisch mit erhöhten CO-, OH- und C-Gehalten, wie sie in der Anlage bei kleineren als den optimalen #-Werten gefunden werden. Ein solcher Betriebszustand äußert sich zunächst in einer mehr oder weniger starken Unruhe des fließenden Stromes. Bei genauer Analyse zeigt sich, daß solche Betriebszustände sich in Stromspitzen äußern, die in den lechselatrom eingelagert sind, welcher durch Druckschwankungen, die durch die Verbrennungsvorgänge in den Zylindern zeitlich periodisch auftreten, erzeugt werden, wobei diese Wechselstroiniomponente zur Notordrehzabl synchron ist. Durch die Analyse des Wechselstromsignals einer derartigen Grenzstromsonde läßt sich daher ein Signal gewinnen, das unerwünschte Betriebs zustände des Verbrennungsmotors, vorzugsweise des Dieselmotors, anzeigt, die bei kleineren als den optimalen X-erten liegen.When the engine is running, an im reaches after opening the exhaust valve Exhaust system of the engine behind this exhaust valve mounted limit current probe a pressure concentration wave of the gas mixture of the burned cylinder contents. the The probe operated in the limit current range then shows a value proportional to the oxygen content Limit current. Surprisingly, it has been shown that unburned fractions, as they occur in operating states close to the run limits and the # = 1 point, from the limit current probe does not run at the same speed with this arrangement are brought to equilibrium like diffusion to the electrode and the electrochemical conversion takes place, d. H. the speed of equilibrium is less than the rate of diffusion of the mixture to the electrode and the electrochemical conversion. Such operating states are identical to increased ones CO, OH and C contents, as they are in the system with less than the optimal # values being found. Such an operating state is initially expressed in a more or less restlessness of the flowing stream. A closer analysis shows that that such operating conditions are expressed in current peaks, which in the Lechselatrom are stored, which is caused by pressure fluctuations caused by the combustion processes occur periodically in the cylinders, with this alternating current component to the Notordrehzabl is synchronous. By analyzing the AC signal of a Such a limit current probe can therefore win a signal that is undesirable Indicates the operating status of the internal combustion engine, preferably the diesel engine, which are smaller than the optimal X values.

Dieses Wechselstromsignal wird nun erfindungsgemäß für die Einregelung der optimalen #-Werte verwendet, indem seine Amplitude auf einem Minimum bei gleichzeitigem minimalem Ä gehalten wird.According to the invention, this alternating current signal is now used for the adjustment the optimal # values used by keeping its amplitude to a minimum while at the same time minimum Ä is kept.

Dies gilt zunächst vorzugsweise für Dieselmotoren ohne Abgasrückführung; es hat sich jedoch gezeigt, daß das Verfahren auch für Dieselmotoren mit Abgasrückführung eingesetzt werden kann, da auch bei diesen Dieselmotoren der Beginn unvollständiger Verbrennung bei erhöhter Abgasrückführung mit Hilfe des beschriebenen Effektes erkannt werden kann. Dadurch wird eine optimale Einregelung der Abgasrückführung möglich.This initially applies preferably to diesel engines without exhaust gas recirculation; however, it has been shown that the process also for diesel engines can be used with exhaust gas recirculation, since the Beginning of incomplete combustion with increased exhaust gas recirculation with the help of the described Effect can be recognized. This ensures optimal regulation of the exhaust gas recirculation possible.

Beschreibung eines Ausführungsbeispiels In einem Dieselmotor wird im Abgasrohr hinter dem iuslaßventil eine mit einer Neßspannung beaufschlagte Grenzstromsonde eingebaut, wie sie beispielsweise aus der DE-OS 27 11 880 bekannt ist. Der fließende Strom wird einem nicht zur Erfindung gehörenden Regelgerät zugeführt, welches gleichzeitig Amplitude und Häufigkeit der Stromspitzen registriert und den Stromwert in einen # #-Wert umsetzt. Das Regelgerät ist so aufgebaut, daß es in Abhängigkeit der aufgenommenen Jerte auf die Brennstoff-Luft-Zuführung derart einwirkt, daß die Amplitude der tlechselstromspitze-nwerte bei gleichzeitigem minimalem #-Wert auf einem Minimum gehalten wird.Description of an embodiment example In a diesel engine In the exhaust pipe behind the outlet valve there is a limit current probe charged with a voltage built in, as is known from DE-OS 27 11 880, for example. The flowing one Current is fed to a control device not belonging to the invention, which at the same time The amplitude and frequency of the current peaks are registered and the current value in one # # Value converts. The control device is designed so that it depends on the recorded Jerte acts on the fuel-air supply in such a way that the amplitude of the alternating current peak values is kept to a minimum while maintaining the minimum # value.

Das erhaltene Signal ist so schnell, daß sogar Verbrennungsvorgänge in einzelnen Zylindern registriert und zur Regelung herangezogen werden können.The signal obtained is so fast that even combustion processes can be registered in individual cylinders and used for regulation.

Claims (1)

Anspruch Verfabren zur Vermeidung von Nichtgleichgewichtszuständen in Abgasen von Brennkraftmaschinen, bei denen im Abgasrohr hinter dem AuslaRventil eine Grenzstromsonde angeordnet ist, die mit einer Meßspannung beauSschlagt ist, dadurch gekennzeichnet, daß bei unvollständiger Verbrennung auftretende Spitzenwerte eines Wechselstromsignales zur Einregelung optimaler #-Werte einem Regelgerät zugeführt werden, das auf die Brennstoff-Luft-Zuführung derart einwirkt, daß die Amplitude der Wechselstromspitzenwerte bei gleichzeitigem minimalem #-Wert auf einen I¢Iinimum gehalten wird.Claim procedure to avoid non-equilibrium states in exhaust gases from internal combustion engines, where in the exhaust pipe behind the exhaust valve a limit current probe is arranged, which is exposed to a measuring voltage, characterized in that peak values occurring in the event of incomplete combustion an alternating current signal is fed to a control device for adjusting optimal # -values be that acts on the fuel-air supply such that the amplitude the alternating current peak values with a simultaneous minimum # value to an I ¢ Iinimum is held.
DE19813127038 1981-07-09 1981-07-09 Method for avoiding states of non-equilibrium in the exhaust gases of internal combustion engines Granted DE3127038A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19813127038 DE3127038A1 (en) 1981-07-09 1981-07-09 Method for avoiding states of non-equilibrium in the exhaust gases of internal combustion engines
JP11875682A JPS5815736A (en) 1981-07-09 1982-07-09 Method of avoiding unbalance state of exhaust gas of internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19813127038 DE3127038A1 (en) 1981-07-09 1981-07-09 Method for avoiding states of non-equilibrium in the exhaust gases of internal combustion engines

Publications (2)

Publication Number Publication Date
DE3127038A1 true DE3127038A1 (en) 1983-01-20
DE3127038C2 DE3127038C2 (en) 1990-02-01

Family

ID=6136451

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19813127038 Granted DE3127038A1 (en) 1981-07-09 1981-07-09 Method for avoiding states of non-equilibrium in the exhaust gases of internal combustion engines

Country Status (2)

Country Link
JP (1) JPS5815736A (en)
DE (1) DE3127038A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4903670A (en) * 1987-02-25 1990-02-27 Audi Ag Control device for a diesel internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4009167A1 (en) * 1990-03-22 1991-09-26 Electro Nite SAMPLER FOR METAL MELTING

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711880A1 (en) * 1977-03-18 1978-09-21 Bosch Gmbh Robert PROBE FOR MEASURING THE OXYGEN CONCENTRATION
DE2946440A1 (en) * 1979-11-17 1981-05-27 Robert Bosch Gmbh, 7000 Stuttgart METHOD FOR OBTAINING A CONTROL SIZE FOR REGULATING THE FUEL-AIR RATIO OF INTERNAL COMBUSTION ENGINES

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711880A1 (en) * 1977-03-18 1978-09-21 Bosch Gmbh Robert PROBE FOR MEASURING THE OXYGEN CONCENTRATION
DE2946440A1 (en) * 1979-11-17 1981-05-27 Robert Bosch Gmbh, 7000 Stuttgart METHOD FOR OBTAINING A CONTROL SIZE FOR REGULATING THE FUEL-AIR RATIO OF INTERNAL COMBUSTION ENGINES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4903670A (en) * 1987-02-25 1990-02-27 Audi Ag Control device for a diesel internal combustion engine

Also Published As

Publication number Publication date
JPS5815736A (en) 1983-01-29
DE3127038C2 (en) 1990-02-01

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8125 Change of the main classification

Ipc: F02D 41/14

D2 Grant after examination
8364 No opposition during term of opposition
8320 Willingness to grant licences declared (paragraph 23)
8339 Ceased/non-payment of the annual fee