EP0719918B1 - Procédé et dispositif de contrÔle de la richesse d'un moteur à allumage commandé - Google Patents

Procédé et dispositif de contrÔle de la richesse d'un moteur à allumage commandé Download PDF

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Publication number
EP0719918B1
EP0719918B1 EP95402920A EP95402920A EP0719918B1 EP 0719918 B1 EP0719918 B1 EP 0719918B1 EP 95402920 A EP95402920 A EP 95402920A EP 95402920 A EP95402920 A EP 95402920A EP 0719918 B1 EP0719918 B1 EP 0719918B1
Authority
EP
European Patent Office
Prior art keywords
richness
sensor
engine
exhaust line
probe
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 - Lifetime
Application number
EP95402920A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0719918A1 (fr
Inventor
Gaétan Monnier
Hervé Perrin
Richard Tilagone
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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 IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of EP0719918A1 publication Critical patent/EP0719918A1/fr
Application granted granted Critical
Publication of EP0719918B1 publication Critical patent/EP0719918B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2441—Methods of calibrating or learning characterised by the learning conditions
    • 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
    • F02D35/0015—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using exhaust gas sensors
    • F02D35/0023—Controlling air supply
    • F02D35/0038—Controlling air supply by means of air pumps
    • 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
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2474—Characteristics of sensors
    • 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
    • F02D41/1456—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 with sensor output signal being linear or quasi-linear with the concentration of oxygen
    • 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
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2432—Methods of calibration
    • 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
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2454—Learning of the air-fuel ratio control

Definitions

  • the present invention relates to the field of control and regulation of engines and more particularly of ignition engines controlled operating in lean mixture.
  • One known way of limiting nitrogen oxide emissions is to run the engine at minimum richness, close to the limit poor engine stability.
  • This type of probe delivers rather qualitative information allowing to know if the engine works in lean mixture (the voltage probe output then tends to 0), in a rich mixture (the voltage of probe output tends to 1 volt) or to stoichiometry (output voltage probes, intermediate, of the order of 0.5 V).
  • proportional probes whose output voltage varies in proportion to the richness of the mixture.
  • a significant disadvantage related to registration, over a range of wider wealth of probes placed in the exhaust is that the new calibration can only be carried out by dismantling the probe, i.e. during periods of immobilization of the vehicle.
  • application EP 0 221 305 teaches a mathematical method for calibrating an oxygen concentration detection probe, based on an injection of additional air, for which a single probe is used, around stoichiometry.
  • the present invention provides a solution to the general problem of aging of the probes in the exhaust lines.
  • the present invention makes it possible to remedy in particular the disadvantages mentioned above.
  • the subject of the invention is a method for controlling the richness of a Positive ignition engine operating in a lean mixture according to claim 1.
  • Zero wealth registration is performed when the engine is at the stop.
  • this zero-rich registration is carried out by a additional air supply upstream of the measurement point (s).
  • Gas powered engines are particularly targeted by the invention.
  • the invention further relates to a device for regulating the richness of a spark ignition engine operating in mixture poor according to claim 7.
  • the device comprises a second probe, placed on said exhaust line, and intended to supply the information necessary to readjust said first probe for a richness equal to unity during engine operation.
  • This second measurement probe can be an all-type probe. or nothing.
  • the first probe is placed upstream of said catalyst while the second probe can be placed preferably downstream of the catalyst, to limit its aging.
  • the device according to the invention may comprise a pump placed on said exhaust line and intended to inject air in upstream of said first probe.
  • the pump is a pump electric.
  • Figure 2 schematically appears a line exhaust 1 from a spark-ignition engine 2.
  • a catalyst 3 type 2 or 3 three-way is placed on the exhaust line 1.
  • an all-or-nothing Lambda 4 probe is placed on said line 1 upstream or downstream of the catalyst 3.
  • This probe 4 provides binary information such as "rich mixture” or “mixture poor. "It is used by the regulatory system to maintain the wealth at a value close to stoichiometry.
  • a second so-called proportional probe 5 is positioned on the line 1, preferably between engine 2 and catalyst 3.
  • FIG. 3 differs from that which has just been described by the additional presence of a pump 6 placed preferably between the motor 2 and the probe 5, intended to inject the air just upstream of the probe 5.
  • the operation of the air pump 6 is not linked to that of the engine; an electric air pump will advantageously chosen.
  • This figure shows the output voltage (U) of a probe proportional to the exhaust, depending on the richness (R) of the mixed.
  • a recalibration of the probe 5 is carried out on the vehicle. at several different wealth points: a zero wealth registration (engine stopped), and readjustment with richness equal to one, (during engine operation).
  • An air pump such as 6 is used more and more frequently engines with exhaust air injection. Therefore, in in this case, nothing needs to be added to the engine to make it work according to the invention.
  • the registration according to the invention is therefore an automated step which does not requires no specific human intervention or specific immobilization of the vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP95402920A 1994-12-29 1995-12-22 Procédé et dispositif de contrÔle de la richesse d'un moteur à allumage commandé Expired - Lifetime EP0719918B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9415898A FR2728940A1 (fr) 1994-12-29 1994-12-29 Procede et dispositif de controle de la richesse d'un moteur a allumage commande
FR9415898 1994-12-29

Publications (2)

Publication Number Publication Date
EP0719918A1 EP0719918A1 (fr) 1996-07-03
EP0719918B1 true EP0719918B1 (fr) 1998-09-02

Family

ID=9470436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402920A Expired - Lifetime EP0719918B1 (fr) 1994-12-29 1995-12-22 Procédé et dispositif de contrÔle de la richesse d'un moteur à allumage commandé

Country Status (5)

Country Link
EP (1) EP0719918B1 (enrdf_load_stackoverflow)
AT (1) ATE170596T1 (enrdf_load_stackoverflow)
DE (1) DE69504468T2 (enrdf_load_stackoverflow)
ES (1) ES2121316T3 (enrdf_load_stackoverflow)
FR (1) FR2728940A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1074833A1 (en) 1997-03-21 2001-02-07 Ngk Spark Plug Co., Ltd Method and apparatus for measuring NOx gas concentration
DE19810973A1 (de) * 1998-03-13 1999-09-30 Fev Motorentech Gmbh Verfahren zur Nullpunktstabilisierung eines Abgassensors sowie Anordnung zur Durchführung des Verfahrens
DE10008441A1 (de) * 2000-02-23 2001-09-13 Heraeus Electro Nite Int Verfahren zur Bestimmung des Sauerstoffgehaltes eines Messgases

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3115404A1 (de) * 1981-04-16 1982-11-11 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und vorrichtung zur ueberwachung und kalibrierung von grenzstromsonden
JPS5857050A (ja) * 1981-09-29 1983-04-05 Toyota Motor Corp 内燃機関の空燃比制御装置
US4502444A (en) * 1983-07-19 1985-03-05 Engelhard Corporation Air-fuel ratio controller
US4751907A (en) * 1985-09-27 1988-06-21 Nissan Motor Co., Ltd. Air/fuel ratio detecting apparatus for internal combustion engines
JPS63239335A (ja) * 1987-03-25 1988-10-05 Toyota Motor Corp 内燃機関の空燃比制御装置
JPH08507143A (ja) * 1993-02-26 1996-07-30 ロート‐テヒニーク・ゲー・エム・ベー・ハー・ウント・コー・フォルシュング・フュア・アウトモービル‐ウント・ウムヴェルトテヒニーク ラムダセンサの組合せ

Also Published As

Publication number Publication date
DE69504468T2 (de) 1999-01-28
FR2728940B1 (enrdf_load_stackoverflow) 1997-02-21
DE69504468D1 (de) 1998-10-08
FR2728940A1 (fr) 1996-07-05
ES2121316T3 (es) 1998-11-16
EP0719918A1 (fr) 1996-07-03
ATE170596T1 (de) 1998-09-15

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