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 PDFInfo
- 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
Links
Images
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)
Description
- La figure 2 est un schéma d'une ligne d'échappement selon un mode de réalisation de l'invention;
- La figure 3 est un schéma d'une ligne d'échappement selon un autre mode de réalisation de l'invention; et
- La figure 4 montre une courbe obtenue selon l'invention.
Claims (10)
- Procédé de contrôle de la richesse d'un moteur (2) à allumage commandé fonctionnant en mélange pauvre, caractérisé en ce qu'il consiste à effectuer in situ (sur véhicule) un recalage d'au moins une première sonde (5) en plusieurs points de fonctionnement correspondant à des richesses différentes, grâce à une deuxième sonde (4) ; la première sonde (5) étant placée sur la ligne d'échappement (1) dudit moteur (2) de façon à mesurer de façon proportionnelle la richesse du fluide s'écoulant dans ladite ligne d'échappement ; ladite deuxième sonde (4) étant placée sur la ligne d'échappement (1) et destinée à fournir l'information nécessaire au recalage de ladite première sonde (5), et en ce que l'on réalise ledit recalage en au moins trois points de fonctionnement dont l'un à richesse nulle.
- Procédé selon la revendication 1, caractérisé en ce que l'on réalise un recalage utilisant un point de fonctionnement autour de la richesse 1.
- Procédé selon la revendication 2, caractérisé en ce que le recalage à richesse nulle est réalisé lorsque le moteur est à l'arrêt.
- Procédé selon la revendication 1, caractérisé en ce que l'on réalise un recalage autour d'un troisième point de fonctionnement correspondant à une richesse quelque peu supérieure à 1.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le recalage autour de la richesse nulle s'effectue par un apport d'air supplémentaire en amont du ou des points de mesure.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit moteur est alimenté au gaz.
- Dispositif de contrôle de richesse destiné à mettre en oeuvre le procédé selon l'une quelconque des revendications précédentes, comprenant au moins une première sonde (5), placée sur une ligne d'échappement (1) équipée d'un catalyseur (3), et destinée à mesurer de façon proportionnelle la richesse du fluide s'écoulant dans ladite ligne d'échappement, caractérisé en ce qu'il comprend en outre une deuxième sonde (4) placée sur la ligne d'échappement (1) et des moyens destinés à fournir l'information nécessaire au recalage de ladite première sonde (5) en au moins trois points de fonctionnement, dont l'un à richesse nulle, pendant le fonctionnement du moteur, lesdit moyens utilisant l'information de ladite deuxième sonde.
- Dispositif selon la revendication 7, caractérisé en ce qu'il comprend / une pompe (6) destinée à injecter de l'air dans ladite ligne d'échappement (1) en amont de ladite première sonde (5).
- Dispositif selon la revendication 8, caractérisé en ce que la pompe (6) est une pompe électrique.
- Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite deuxième sonde (4) est une sonde de type tout ou rien utilisée notamment pour déterminer des richesses proches de l'unité.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9415898 | 1994-12-29 | ||
FR9415898A FR2728940A1 (fr) | 1994-12-29 | 1994-12-29 | Procede et dispositif de controle de la richesse d'un moteur a allumage commande |
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 (fr) |
AT (1) | ATE170596T1 (fr) |
DE (1) | DE69504468T2 (fr) |
ES (1) | ES2121316T3 (fr) |
FR (1) | FR2728940A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1074834B1 (fr) | 1997-03-21 | 2012-05-23 | Ngk Spark Plug Co., Ltd | Procédé et appareil de mesure de la concentration d'oxydes d'azote |
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)
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 |
ES2107812T3 (es) * | 1993-02-26 | 1997-12-01 | Heraeus Electro Nite Int | Combinacion de sondas lambda. |
-
1994
- 1994-12-29 FR FR9415898A patent/FR2728940A1/fr active Granted
-
1995
- 1995-12-22 EP EP95402920A patent/EP0719918B1/fr not_active Expired - Lifetime
- 1995-12-22 DE DE69504468T patent/DE69504468T2/de not_active Expired - Fee Related
- 1995-12-22 ES ES95402920T patent/ES2121316T3/es not_active Expired - Lifetime
- 1995-12-22 AT AT95402920T patent/ATE170596T1/de active
Also Published As
Publication number | Publication date |
---|---|
FR2728940A1 (fr) | 1996-07-05 |
FR2728940B1 (fr) | 1997-02-21 |
ATE170596T1 (de) | 1998-09-15 |
DE69504468T2 (de) | 1999-01-28 |
EP0719918A1 (fr) | 1996-07-03 |
DE69504468D1 (de) | 1998-10-08 |
ES2121316T3 (es) | 1998-11-16 |
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