EP0159734A1 - Sauerstoffsonde im Abgassystem einer Brennkraftmaschine - Google Patents

Sauerstoffsonde im Abgassystem einer Brennkraftmaschine Download PDF

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Publication number
EP0159734A1
EP0159734A1 EP85200381A EP85200381A EP0159734A1 EP 0159734 A1 EP0159734 A1 EP 0159734A1 EP 85200381 A EP85200381 A EP 85200381A EP 85200381 A EP85200381 A EP 85200381A EP 0159734 A1 EP0159734 A1 EP 0159734A1
Authority
EP
European Patent Office
Prior art keywords
probe
exhaust gas
exhaust
engine
ducts
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Withdrawn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
EP85200381A
Other languages
English (en)
French (fr)
Inventor
Angelo Ciccarone
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.)
Fiat Auto SpA
Original Assignee
Alfa Lancia Industriale SpA
Alfa Romeo SpA
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 Alfa Lancia Industriale SpA, Alfa Romeo SpA filed Critical Alfa Lancia Industriale SpA
Publication of EP0159734A1 publication Critical patent/EP0159734A1/de
Withdrawn legal-status Critical Current

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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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor

Definitions

  • This invention relates to a system for discharging the exhaust gas of an internal combustion engine to atmosphere, the system being provided with a trivalent catalytic muffler and at least one sensor for measuring the oxygen present in said exhaust gas.
  • trivalent catalytic mufflers are disposed in the exhaust systems in order to oxidise HC and CO to H 2 O and CO 2 , and to reduce the NOx components to N , they being formed either with a single oxidising and reducing catalytic bed or with two catalytic beds, one being oxidising and the other reducing.
  • the purification efficiency of the catalyst constituting the catalytic bed is a maximum when the air/petrol ratio of the mixture fed to the engine cylinders is equal to the stoichiometric ratio.
  • an exhaust gas composition sensor is generally used constituted by a probe able to measure the oxygen concentration in said exhaust gas and to provide a signal indicative of a rich or lean mixture.
  • Probes of this type are essentially constituted by a layer of solid electrolyte which conducts oxygen ions, such as zinconic oxide stabilised with calcium oxide, a layer which forms a measurement electrode, generally of porous platinum and disposed on one of the faces of the solid electrolyte, and a layer which forms a reference electrode, disposed on the other face of said electrolyte.
  • the solid electrolyte layer is in the form of a tube closed at one end so that the reference electrode layer, which is located on the inside, can be exposed to the air used as the source of reference oxygen partial pressure, while the measurement electrode layer, which is located on the outside, is exposed to the engine exhaust gas.
  • the probe generates an electromotive force when a difference exists between the partial pressure of the oxygen in the air in contact with the reference electrode and the variable partial pressure of the air present in the exhaust gas applied to the measurement electrode.
  • the value of the electromotive force generated by the probe which indicates the air/petrol ratio of the mixture fed to the engine, remains constant at a high level if said air/petrol ratio is less than the stoichiometric ratio (rich mixture), whereas it remains practically constant at a low level if the ratio exceeds the stoichiometric (lean mixture).
  • the electromotive force generated- by the probe for measuring the oxygen present in the exhaust gas is fed to an electronic circuit which provides a control signal to the engine fuel feed means on the basis of the result of a comparison between a predetermined reference voltage corresponding to the stoichiometric ratio, and the value of the electromotive force.
  • the oxygen measurement probe In order to provide a reliable indication, the oxygen measurement probe must be located at a point in the exhaust system to which the gas discharged from all the engine cylinders flows, so that the probe is able to measure the total oxygen concentration in the engine exhaust gas.
  • the object of the present invention is therefore to provide a location for the probe which does not penalise the design or construction of the exhaust system ducts, while at the same time enables the probe to make contact with the entire engine exhaust gas;
  • this object is attained according to the invention by disposing at least one oxygen concentration measurement probe downstream of said at least one catalytic bed, and possibly immediately downstream thereof.
  • the reference numeral 10 indicates the engine air intake filter, and 11, 12, 13, 14 indicate the intake ducts, each provided with a throttle valve 15, 16, 17, 18.
  • the elctrically operated injectors 19, 20, 21, 22, which feed petrol to the engine cylinders, are disposed in the intake ducts.
  • the figure also diagrammatically indicates the cylinder block, indicated by 23, and the cylinders, indicated by 24, 25, 26, 27.
  • the reference numerals 28, 29, 30, 31 indicate the exhaust ducts of the individual cylinders, the ducts 28 and 31 converging into the common duct indicated by 32, and the ducts 29 and 30 converging into the common duct 33.
  • the ducts 32 and 33 open into the catalytic muffler 34, which in this case is provided with a trivalent catalytic bed 35, ie a catalyst able to simultaneously eliminate the pollutant C0, HC and NOx components.
  • a duct 36 emerges from the catalytic muffler 34 for conveying the gas to the normal silencers (not shown) and then to atmosphere.
  • a probe 37 for measuring the oxygen concentration in the exhaust gas is disposed in the duct 36, immediately downstream of the catalytic muffler 34.
  • Said probe 37 could also be disposed immediately downstream of the catalytic bed 35 as shown by dashed lines.
  • the signal provided by the probe 37 is fed by the line 38 to the regulator device represented by the central electronic unit 45, which processes it together with tne signals indicative of the engine parameters, such as the r.p.m. and throttle valve angles, represented diagrammatically by the arrows 39 and 40.
  • the central unit 45 which could be constructed as described in the U.K. Pat. Appla. N° of the present applicant, calculates the petrol quantity to be delivered by the electrically-actuated injector as a function of the engine parameters, and in the case of feedback operation corrects the calculated values on the basis of the signal provided by the probe 37, in order to enrich or weaken the mixture fed to the engine if its ratio deviates from the stoichiometric value, so as to restore it to said stoichiometric value.
  • the other signals indicative of other engine parameters are not shown for simplicity of representation, these including for example the engine cooling water temperature, and which could be fed to the central unit 45 for processing, to give the electrically-actuated injector control signals, represented by the petrol quantity to be injected, these signals being fed to said electrically-actuated injector through the lines 41,42,43,44'.
  • Arranging the probe 37 downstream of the catalytic bed gives a double advantage.
  • maximum freedom is obtained in choosing the sizing of the ducts 28, 29, 30, 31 and 32, 33, and on the other hand the probe comes into contact with the entire engine exhaust gas and can operate effectively in providing a signal indicative of the air/petrol ratio (rich., lean, stoichiometric) of the mixture fed to the engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
EP85200381A 1984-03-20 1985-03-14 Sauerstoffsonde im Abgassystem einer Brennkraftmaschine Withdrawn EP0159734A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT20140/84A IT1173894B (it) 1984-03-20 1984-03-20 Impianto di scarico per un motore a c.i. dotato di una sonda per il rilievo dell'ossigeno nei gas di scarico
IT2014084 1984-03-20

Publications (1)

Publication Number Publication Date
EP0159734A1 true EP0159734A1 (de) 1985-10-30

Family

ID=11164132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85200381A Withdrawn EP0159734A1 (de) 1984-03-20 1985-03-14 Sauerstoffsonde im Abgassystem einer Brennkraftmaschine

Country Status (2)

Country Link
EP (1) EP0159734A1 (de)
IT (1) IT1173894B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1052393A3 (de) * 1999-05-10 2001-02-07 Toyota Jidosha Kabushiki Kaisha Luft-Brennstoff-Verhältnisregelvorrichtung und Verfahren für Brennkraftmaschinen
CN103732888A (zh) * 2011-08-05 2014-04-16 胡斯华纳有限公司 二冲程内燃发动机空燃比的调节

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2328459A1 (de) * 1973-01-31 1975-01-02 Bosch Gmbh Robert Einrichtung zur ueberwachung von katalytischen reaktoren in abgasentgiftungsanlagen von brennkraftmaschinen
FR2242564A1 (de) * 1973-09-04 1975-03-28 Universal Oil Prod Co
DE2704777A1 (de) * 1976-02-16 1977-08-18 Alfa Romeo Spa Verbrennungsmotor, dessen auspuffeinrichtung mit sonden zur analyse der abgase versehen ist
US4136645A (en) * 1976-06-15 1979-01-30 Nippondenso Co., Ltd. Electric air-to-fuel ratio control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2328459A1 (de) * 1973-01-31 1975-01-02 Bosch Gmbh Robert Einrichtung zur ueberwachung von katalytischen reaktoren in abgasentgiftungsanlagen von brennkraftmaschinen
FR2242564A1 (de) * 1973-09-04 1975-03-28 Universal Oil Prod Co
DE2704777A1 (de) * 1976-02-16 1977-08-18 Alfa Romeo Spa Verbrennungsmotor, dessen auspuffeinrichtung mit sonden zur analyse der abgase versehen ist
US4136645A (en) * 1976-06-15 1979-01-30 Nippondenso Co., Ltd. Electric air-to-fuel ratio control system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1052393A3 (de) * 1999-05-10 2001-02-07 Toyota Jidosha Kabushiki Kaisha Luft-Brennstoff-Verhältnisregelvorrichtung und Verfahren für Brennkraftmaschinen
US6250074B1 (en) 1999-05-10 2001-06-26 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio control apparatus and method of internal combustion engine
CN103732888A (zh) * 2011-08-05 2014-04-16 胡斯华纳有限公司 二冲程内燃发动机空燃比的调节
US9759127B2 (en) 2011-08-05 2017-09-12 Husqvarna Ab Adjusting of air-fuel ratio of a two-stroke internal combustion engine
US10196972B2 (en) 2011-08-05 2019-02-05 Husqvarna Ab Adjusting of air-fuel ratio of a two-stroke internal combustion engine

Also Published As

Publication number Publication date
IT8420140A0 (it) 1984-03-20
IT1173894B (it) 1987-06-24

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Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19860120

17Q First examination report despatched

Effective date: 19861105

R17C First examination report despatched (corrected)

Effective date: 19870615

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ALFA LANCIA INDUSTRIALE S.R.L.

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ALFA LANCIA INDUSTRIALE S.P.A.

18D Application deemed to be withdrawn

Effective date: 19871027

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ALFA LANCIA INDUSTRIALE S.R.L.

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CICCARONE, ANGELO