EP1687520A1 - Systeme de desulfatation d'un piege a nox, pour moteur de vehicule automobile - Google Patents
Systeme de desulfatation d'un piege a nox, pour moteur de vehicule automobileInfo
- Publication number
- EP1687520A1 EP1687520A1 EP04805448A EP04805448A EP1687520A1 EP 1687520 A1 EP1687520 A1 EP 1687520A1 EP 04805448 A EP04805448 A EP 04805448A EP 04805448 A EP04805448 A EP 04805448A EP 1687520 A1 EP1687520 A1 EP 1687520A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- level
- strategy
- exhaust line
- period
- 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
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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
- F02D41/028—Desulfurisation of NOx traps or adsorbent
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
-
- 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
- F02D41/1446—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 exhaust temperatures
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
Definitions
- the present invention relates to a system for desulfating a NOx trap associated with means forming an oxidation catalyst, and integrated in an exhaust line of a motor vehicle engine. More particularly, the invention relates to such a system in which the engine is associated with common rail means for supplying fuel to the cylinders of this engine, adapted, by modification of parameters for controlling the operation of the engine, to switch the engine between lean and rich mix operations. It is known in fact that in order to treat polluting emissions in a regulatory manner for vehicles with diesel engines in particular, different types of function are necessary, namely an oxidation function for the treatment of CO and HC, a reduction function nitrogen oxides and a filtration function associated with a particle combustion function.
- NOx trap One of the ways to reduce nitrogen oxides is to use a NOx trap.
- the impregnation of this trap then contains storage elements, for example barium, on which the nitrogen oxides are fixed, in the form of nitrates.
- the exposure of the trap to SO 2 formed from the sulfur contained in the fuel and the lubricating oil of the engine generates the formation of sulfates, for example barium sulfate, which are more stable compounds than nitrates.
- Regeneration of the NOx trap then converts the nitrogen oxides, but does not remove the sulfates.
- the trap thus gradually saturates with sulphates, which has the effect of reducing the catalytic performances of the trap (conversion NOx, but also CO and HC).
- the sulfates are essentially destocked in the form of H 2 S or SO 2, the other compounds such as COS being emitted in a much smaller quantity.
- the sulfates will preferably be desorbed in the form of H 2 S (bad-smelling gas) when the medium is in deficit of oxygen. This is particularly the case when the engine operates in a rich mixture.
- the formulation of a NOx trap may contain so-called “OSC” oxygen storage elements which release oxygen when the medium is poor in oxidizing species. When the engine switches from rich mode to lean mode, the OSC releases oxygen. Unfortunately the OSC is not an infinite reservoir of oxygen and, after a while, it is exhausted.
- the aim of the invention is therefore to propose a system which makes it possible to maintain the NOx trap in a thermal window of maximum efficiency, while minimizing the risk of aging of the catalytic impregnation and limiting as much as possible the gaseous emissions d ⁇ 2 S during a desulfation.
- the subject of the invention is a system for desulfating a NOx trap associated with means forming an oxidation catalyst, and integrated into an exhaust line of a diesel engine of a motor vehicle, in which the engine is associated with common rail means for supplying fuel to the engine cylinders, adapted, by modification of parameters controlling the operation of the engine, to switch the engine between lean mixture and rich mixture operations, characterized in that the supply means are adapted to define three strategies for controlling the operation of the engine in lean mixture, the first known as normal strategy corresponding to normal engine operation, the second known level 1 strategy, and the third so-called level 2 strategy, to obtain different thermal levels in the exhaust line, the thermal level obtained by application of the third level 2 strategy being higher than that obtained by application of the second level 1 strategy, which is itself higher than that obtained by applying the first normal strategy, and in that the supply means are connected to: - means for detecting a desulfation request to control the means supply in order to initiate an operation of the engine according to the second level 1 strategy; - means for monitoring
- - the threshold temperatures can be calibrated; - the time periods can be calibrated; - It includes means for sending the request for desulfation and stopping it; the means for monitoring the priming state of the means forming a catalyst and for acquiring a thermal level in the exhaust line, comprise temperature sensors; - The supply means are adapted to take into account the aging of the trap.
- a desulfation system for a NOx trap designated by the general reference 1 in this figure, associated with means forming an oxidation catalyst, designated by the general reference 2, and integrated into an exhaust line 3 of a diesel engine of a motor vehicle.
- This engine is designated by the general reference 4 and is for example associated with a turbocharger whose turbine portion 5 is disposed in the exhaust line and whose compressor portion 6 is disposed upstream of the engine.
- the engine is associated with means 7 with common rail for supplying fuel to the engine cylinders, adapted, by modification of the parameters for controlling the operation of the engine, to switch the engine between lean mixture and rich mixture operations.
- these supply means and this supervisor are adapted to define three strategies for controlling the operation of the lean mixture engine, the first 11 known as normal strategy corresponding to normal engine operation, the second known as level 1 strategy , 12, and the third, called level 2 strategy, 13.
- This then makes it possible, by controlling the operation of the engine, to obtain different thermal levels in the exhaust line, the thermal level obtained by applying the third strategy of level 2, 13, being higher than that obtained by application of the second strategy of level 1, 12, which is itself higher than that obtained by application of the first normal strategy 11.
- Supervisor 8 is also connected to means for sending a request for desulfation of the NOx trap or stopping it, designated by the general reference 15 and to various temperature sensors, for example 16, 17 and 18, distributed in the exhaust line to acquire thermal levels therein, as will be described in more detail below.
- the temperature sensor 16 is suitable for acquiring the thermal level in the exhaust line, while the sensors 17 and 18 placed on either side of the catalyst means make it possible, for example, to determine the state of initiation of these, in a conventional manner.
- the operation of this system is illustrated in FIG. 2 and begins with the reception by the supervisor 8 of the supply means, of a desulphation request at 20. On detection of this desulphation request, the supply means 7 , 8 are adapted to start an operation of the engine according to the second level 1 strategy, at 21.
- the supervisor then monitors the priming state of the catalyst means at 22, to start as soon as the catalyst means are activated, the third level 2 strategy at 23. Then, the supervisor monitors at 24, the thermal level in the exhaust line 3 of the engine to start operation in rich mode of the engine, at 25, when this thermal level exceeds a temperature of predetermined goal for a first predetermined period of time. On the other hand, this supervisor 8 is also adapted to cut the desulfation at 24a, if this objective temperature has not been reached before the expiration of a second predetermined maximum time period. If the test at 24 is positive, the supervisor 8 is suitable for monitoring the operation of the rich mixture in the engine and detecting the conditions for the passage of three tests at 26, 27 and 28 respectively.
- the means for monitoring the operation of the engine are adapted to control an operation of this engine in lean mixture according to the level 2 strategy at 29, after a third period of predetermined time from the test at 26, lean mixture operation of the engine according to the third level 2 strategy at 29, if the thermal level in the exhaust line drops below a predetermined low temperature threshold for a fourth period of time from the test in 28, or an operation of the mo- lor in lean mixture according to the second level 1 strategy in 31, if the thermal level in the exhaust line exceeds a predetermined high temperature threshold for a fifth period of time, from the test in 27.
- the supervisor 8 then maintains this operation of the engine according to this second level 1 strategy, at 31, for a sixth predetermined forcing period of time, at 32, or until the thermal level in the exhaust line has gone down, at 33, - below the high temperature threshold minus a hysteresis deviation, for a seventh period of time.
- the supervisor is adapted to control an operation of the engine in lean mixture, at 34, according to the first normal strategy in the case where the thermal level in the exhaust line has not gone down in - below the high temperature threshold minus a hysteresis deviation after an eighth maximum cooling time period, until the thermal level in the exhaust line has dropped below this high temperature threshold minus l hysteresis deviation during the seventh period of time, as illustrated in 35.
- the supervisor then keeps the engine running in lean mode according to one of the strategies from level 2 to 29, from level 1 to 31 or normal in 34, as defined above, during a ninth period of time in 36 and at the expiration of this ninth period of time, if the thermal level in the exhaust line is between the pre target temperature determined and the high temperature threshold, loops this motor control from a mixture rich operation in 25, until the detection of a desulfation stop request in 37, by the supervisor 8.
- the time counter is triggered as soon as we return to lean mode and it is the cumulative time spent in level 2 plus possibly in level 1 plus possibly in normal lean which counts in this comparison.
- the different threshold temperatures and the time periods mentioned above can be calibrated.
- the high and low threshold temperatures are safeties which, for the high temperature threshold, make it possible not to be too old.
- read the thermal trap this aging resulting in a reduction in the efficiency of the conversions of NOx, CO and HC, while the low threshold temperature represents the minimum temperature below which the desulfation process is too slow.
- the duration of the desulfation will be gradually lengthened.
- Several solutions can be envisaged to take account of this aging, depending in particular on the mileage, the quantity of sulfur calculated seen by the trap, the conversion efficiency of NOx measured by NOx sensors placed upstream and downstream of the trap, thermal levels seen by the trap and measured either in the trap or downstream of the trap, etc.
- Such a control of the operation of the engine then makes it possible to maintain the trap in a window of maximum thermal efficiency while limiting as much as possible the harmful emissions and by adapting the strategies according to the aging of the trap.
- the means forming an oxidation catalyst and the NOx trap can be integrated into one and the same element, in particular on the same substrate.
- a particle filter integrating the oxidation function can be envisaged.
- a NOx trap incorporating such an oxidation function can also be envisaged, whether this is additive or not.
- This oxidation and / or NOx trap function can be fulfilled, for example, by an additive mixed with the fuel.
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)
- Centrifugal Separators (AREA)
- Motor Or Generator Frames (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0313827A FR2862703B1 (fr) | 2003-11-25 | 2003-11-25 | Systeme de desulfatation d'un piege a nox, pour moteur de vehicule automobile |
PCT/FR2004/002908 WO2005064142A1 (fr) | 2003-11-25 | 2004-11-12 | Systeme de desulfatation d'un piege a nox, pour moteur de vehicule automobile |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1687520A1 true EP1687520A1 (fr) | 2006-08-09 |
EP1687520B1 EP1687520B1 (fr) | 2008-01-23 |
Family
ID=34531265
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04805448A Not-in-force EP1687520B1 (fr) | 2003-11-25 | 2004-11-12 | Systeme de desulfatation d'un piege a nox, pour moteur de vehicule automobile |
Country Status (7)
Country | Link |
---|---|
US (1) | US7581388B2 (fr) |
EP (1) | EP1687520B1 (fr) |
JP (1) | JP2007512466A (fr) |
AT (1) | ATE384865T1 (fr) |
DE (1) | DE602004011556T2 (fr) |
FR (1) | FR2862703B1 (fr) |
WO (1) | WO2005064142A1 (fr) |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5704339A (en) * | 1996-04-26 | 1998-01-06 | Ford Global Technologies, Inc. | method and apparatus for improving vehicle fuel economy |
EP0892158B1 (fr) * | 1997-07-19 | 2003-02-12 | Volkswagen Aktiengesellschaft | Procédé et dispositif de surveillance de désulfuration de catalyseurs de stockage de NOx |
DE69816939T2 (de) | 1997-11-10 | 2004-06-03 | Mitsubishi Jidosha Kogyo K.K. | Vorrichtung zur Abgasreinigung für eine Brennkraftmaschine |
DE19758018A1 (de) * | 1997-12-29 | 1999-07-01 | Volkswagen Ag | Regeneration eines NOx-Speicherkatalysators eines Verbrennungsmotors |
EP0937539A1 (fr) | 1998-02-24 | 1999-08-25 | Mikron SA Agno | Machine outil avec poste de travail multiple |
US6205773B1 (en) * | 1998-07-07 | 2001-03-27 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device for an internal combustion engine |
JP3952109B2 (ja) * | 1998-11-24 | 2007-08-01 | 三菱自動車工業株式会社 | 内燃機関の排気浄化装置 |
JP3832550B2 (ja) * | 1999-09-13 | 2006-10-11 | 三菱自動車工業株式会社 | 内燃機関の排気浄化装置 |
DE10001432A1 (de) * | 2000-01-15 | 2001-08-16 | Volkswagen Ag | Verfahren und Vorrichtung zur Steuerung einer Entschwefelung eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten NO¶x¶-Speicherkatalysators |
JP3514218B2 (ja) * | 2000-07-24 | 2004-03-31 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
DE10054005A1 (de) | 2000-11-01 | 2002-05-08 | Daimler Chrysler Ag | Verfahren zum Betrieb einer Abgasreinigungsanlage mit Stickoxidspeicher |
US6615577B2 (en) | 2001-06-19 | 2003-09-09 | Ford Global Technologies, Llc | Method and system for controlling a regeneration cycle of an emission control device |
DE10142669B4 (de) * | 2001-08-31 | 2004-04-15 | Bayerische Motoren Werke Ag | Motorsteuerung und Verfahren zum Reinigen eines Katalysators in einer Abgasanlage einer Mehrzylinderbrennkraftmaschine |
JP3757856B2 (ja) * | 2001-12-07 | 2006-03-22 | トヨタ自動車株式会社 | 排気ガス浄化装置 |
JP4175022B2 (ja) * | 2002-05-20 | 2008-11-05 | 日産自動車株式会社 | 内燃機関の排気浄化装置 |
US7152397B2 (en) | 2003-11-07 | 2006-12-26 | Peugeot Citroen Automobiles Sa | Additional system for assisting regeneration of pollution control means of a motor vehicle |
FR2862702B1 (fr) * | 2003-11-25 | 2006-02-24 | Peugeot Citroen Automobiles Sa | Systeme de desulfatation d'un piege a nox |
JP4349119B2 (ja) * | 2003-12-19 | 2009-10-21 | いすゞ自動車株式会社 | 排気ガス浄化方法及び排気ガス浄化システム |
FR2873159B1 (fr) * | 2004-07-15 | 2008-04-25 | Peugeot Citroen Automobiles Sa | Systeme de desulfatation d'un piege a nox dispose dans une ligne d'echappement d'un moteur diesel de vehicule automobile |
US7197867B2 (en) * | 2004-10-04 | 2007-04-03 | Southwest Research Institute | Method for the simultaneous desulfation of a lean NOx trap and regeneration of a Diesel particulate filter |
-
2003
- 2003-11-25 FR FR0313827A patent/FR2862703B1/fr not_active Expired - Fee Related
-
2004
- 2004-11-12 US US10/595,823 patent/US7581388B2/en not_active Expired - Fee Related
- 2004-11-12 WO PCT/FR2004/002908 patent/WO2005064142A1/fr active IP Right Grant
- 2004-11-12 EP EP04805448A patent/EP1687520B1/fr not_active Not-in-force
- 2004-11-12 AT AT04805448T patent/ATE384865T1/de not_active IP Right Cessation
- 2004-11-12 DE DE602004011556T patent/DE602004011556T2/de active Active
- 2004-11-12 JP JP2006540507A patent/JP2007512466A/ja not_active Ceased
Non-Patent Citations (1)
Title |
---|
See references of WO2005064142A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE602004011556D1 (de) | 2008-03-13 |
US20070125068A1 (en) | 2007-06-07 |
FR2862703B1 (fr) | 2006-02-24 |
WO2005064142A1 (fr) | 2005-07-14 |
EP1687520B1 (fr) | 2008-01-23 |
FR2862703A1 (fr) | 2005-05-27 |
US7581388B2 (en) | 2009-09-01 |
JP2007512466A (ja) | 2007-05-17 |
ATE384865T1 (de) | 2008-02-15 |
DE602004011556T2 (de) | 2009-01-29 |
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