WO2000065207A1 - Method for controlling the richness of the air/fuel mixture of an internal combustion engine fitted with a hydrocarbon trap - Google Patents
Method for controlling the richness of the air/fuel mixture of an internal combustion engine fitted with a hydrocarbon trap Download PDFInfo
- Publication number
- WO2000065207A1 WO2000065207A1 PCT/FR2000/001037 FR0001037W WO0065207A1 WO 2000065207 A1 WO2000065207 A1 WO 2000065207A1 FR 0001037 W FR0001037 W FR 0001037W WO 0065207 A1 WO0065207 A1 WO 0065207A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- richness
- trap
- fuel
- engine
- mixture
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0835—Hydrocarbons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
-
- 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
-
- 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
-
- 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
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
- F02D2200/0804—Estimation of the temperature of the exhaust gas treatment apparatus
Definitions
- the present invention relates to a method for controlling the richness of the air / fuel mixture of an internal combustion engine and, more particularly, to such a method applied to an engine delivering exhaust gases in a line where these these pass successively through an oil trap and a catalytic converter for treating said gases, the fuel richness of the mixture being regulated in a closed loop at a predetermined set richness by means of a signal delivered by an oxygen sensor placed in line d exhaust between the engine and the oil trap.
- FIG. 1 of the accompanying drawing an internal combustion engine 1 placed in the environment described above, the engine exhaust passing through a line 2 successively passing through an oil trap 3 and a catalytic converter 4 , for example of the "trifunctional" type capable of oxidizing unburnt hydrocarbons and carbon monoxide contained in the exhaust gases and of reducing the nitrogen oxides contained in these gases, so as to transform these harmful chemical species into species less harmful, even harmless chemicals (nitrogen).
- a catalytic converter 4 for example of the "trifunctional" type capable of oxidizing unburnt hydrocarbons and carbon monoxide contained in the exhaust gases and of reducing the nitrogen oxides contained in these gases, so as to transform these harmful chemical species into species less harmful, even harmless chemicals (nitrogen).
- This regulation is commonly provided by closed-loop control of the opening time ti of fuel injectors (not shown) in the engine cylinders, this time being commonly called “injection time”.
- the regulation makes use of a signal delivered by an oxygen probe, commonly called lambda probe, sensitive to the richness in oxygen of the exhaust gases, richness which one knows that it makes it possible to follow the evolutions, around the stoechio etrie , the fuel richness of the air / fuel mixture which powers the engine.
- the signal delivered by the probe 5 "beats” thus between two levels “high” and “low” representative of a mixture called “rich” or “poor”, respectively.
- the computer uses this information to adjust the injection time. If it perceives a lean mixture, it increases the injection time until the probe switches back to the level representative of a rich mixture. Thus the probe "beats" permanently. A certain beat frequency is necessary to obtain a fine regulation of the richness.
- Regulation is commonly performed by a digital computer 6 duly programmed for this purpose.
- the computer 6 moreover generally ensures complete management of the engine and then controls other operating parameters of the latter, such as the angle ⁇ of advance when the air / fuel mixture is ignited, for example.
- the probe 5 In its position shown in FIG. 1, the probe 5 is not sensitive to the release of hydrocarbons by the trap 3, placed downstream of the probe, release which enriches the exhaust gases with hydrocarbons, the composition of these gases no longer corresponding to that which results from the combustion by the engine of an air / fuel mixture of fuel richness included in the "window" mentioned above, for which the operation of the pot 4 is optimal.
- the object of the present invention is precisely to provide a method for controlling the richness of the air / fuel mixture of an internal combustion engine capable of maintaining the optimal operation of a catalytic converter for treating the exhaust gases of the engine during periods of release of oil by an oil trap.
- this compensates for the excess hydrocarbons present in the exhaust gases due to the release of the hydrocarbons contained in the trap and an efficient operation of the catalytic converter placed downstream of the hydrocarbon trap is maintained. .
- step a) described above the quantity of fuel contained in the trap is estimated and an operation of the trap in the release of hydrocarbons is detected when said quantity is positive and that the temperature of the trap is higher than a predetermined temperature.
- the quantity of fuel stored is estimated using a model of the current value (MHCi) of this quantity such as:
- Ki and K 2 are coefficients and DGE the exhaust gas flow.
- the estimated quantity of trapped fuel is decremented, in proportion to the flow rate of the exhaust gases.
- step b) described above we reduces the setpoint richness of the closed-loop regulation of the richness of the air / fuel mixture supplying the engine, by acting on a richness loop correction coefficient, involved in the calculation of the time of injection of said fuel into said engine. More particularly, action is taken on a proportional correction of said coefficient so as to regulate said air / fuel mixture into a "lean" mixture.
- FIG. 1 is a diagram of a device for implementing the method according to the invention, partially described in the preamble to this description, and
- an operation of the unburnt hydrocarbon trap 3 is detected by estimation in releasing said hydrocarbons into the exhaust line 2. To do this it is necessary to determine, on the one hand, whether the trap 3 contains hydrocarbons and, on the other hand, if the temperature of this trap is high enough for the trapped hydrocarbons to be released into the exhaust line 2.
- the temperature of the trap 3 is known either by a temperature sensor 7 delivering to the computer 6 a signal representative of this temperature, or by a model making it possible to calculate this temperature.
- F a filter coefficient, a function of the DGE flow rate of the exhaust gases.
- the offset being a function of the flow rate DGE of the exhaust gases.
- the computer 6 is duly programmed to execute the estimation strategy detailed below.
- the evolution of the mass MHCi of hydrocarbons stored in the trap is followed at the current sampling instant i, at using the model:
- - Ki constant coefficient, or resulting from a mapping involving the temperature of the trap and the quantity of hydrocarbons stored in this trap, for example,
- This model ceases to be applied as soon as the temperature T p of the trap 3 exceeds a temperature T s predetermined above which stored hydrocarbons are released into the exhaust line, and therefore pass into the catalytic converter 4 in addition to the unburnt hydrocarbons in the engine.
- T p of the trap 3 exceeds a temperature T s predetermined above which stored hydrocarbons are released into the exhaust line, and therefore pass into the catalytic converter 4 in addition to the unburnt hydrocarbons in the engine.
- the DHC flow rate of the hydrocarbons then released by the trap 3 into the exhaust line 2 is therefore equal to:
- the richness of the air / fuel mixture entering the engine is reduced when the trap 3 releases hydrocarbons into the exhaust line 2, by acting on the duration of the injection time t lr calculated by the computer 6 .
- t x A + F. (P + P 0 )
- A, F and Po are coefficients and P the pressure d admission of morality 1.
- the coefficient F in particular, consists of a set of multiplicative terms such as, for example:
- F (1 + Fi / 256) (1 + F 2/256) (1 + ALPHA CL / 256)
- F ⁇ , F 2, etc .. are scaling correction coefficients, air temperature, water temperature, etc.
- ALPHA CL a correction coefficient known as a "richness regulation loop" which occurs when the computer 6 provides closed loop regulation of the richness of the air / fuel mixture supplying the engine.
- ALPHA CL first receives a "proportional correction” CP then a "full correction” CI, up to what these corrections cause a new tilting of the signal delivered by the probe 5, and so on.
- the known oxygen probes have switching times which differ slightly depending on whether one goes from a rich mixture to a lean mixture or, on the contrary, from a lean mixture to a rich mixture, and that the richness at which the probe switches is not exactly equal to 1. These differences mean that, unless an adequate correction is provided, a particular probe ensures regulation around a richness slightly greater or slightly less than 1. This phenomenon is conventionally corrected by acting on the proportional correction CP, so as to rebalance the aforementioned areas.
- the setpoint richness of the regulation provided by the computer 6, nominally equal to 1 is reduced by acting on the value of the proportional correction CP applied to ALPHA CL, as shown in Figure 3 of the accompanying drawing.
- This action consists in increasing the absolute value of the proportional correction when the probe 5 detects a rich mixture and in reducing the absolute value of this correction when the probe detects a lean mixture.
- the nominal value of the proportional correction CP is modified by adding or subtracting an "offset" 0.
- the offset 0 is added or subtracted, to the absolute value of the correction, depending on whether one is mixing rich or poor mixture, respectively.
- the offset 0 is advantageously a function of the DHC flow rate of hydrocarbons released by the trap 3, this flow rate being known to the computer 6 by the relation (2) given above.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00920853A EP1173660A1 (en) | 1999-04-27 | 2000-04-20 | Method for controlling the richness of the air/fuel mixture of an internal combustion engine fitted with a hydrocarbon trap |
JP2000613929A JP2002543322A (en) | 1999-04-27 | 2000-04-20 | Method for controlling richness of air / fuel mixture gas of an internal combustion engine that discharges exhaust gas to an exhaust line provided with a hydrocarbon trap |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR99/05317 | 1999-04-27 | ||
FR9905317A FR2792967B1 (en) | 1999-04-27 | 1999-04-27 | METHOD FOR CONTROLLING THE RICHNESS OF THE AIR / FUEL MIXTURE OF AN INTERNAL COMBUSTION ENGINE DELIVERING EXHAUST GASES IN A LINE EQUIPPED WITH A HYDROCARBON TRAP |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000065207A1 true WO2000065207A1 (en) | 2000-11-02 |
Family
ID=9544914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2000/001037 WO2000065207A1 (en) | 1999-04-27 | 2000-04-20 | Method for controlling the richness of the air/fuel mixture of an internal combustion engine fitted with a hydrocarbon trap |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1173660A1 (en) |
JP (1) | JP2002543322A (en) |
FR (1) | FR2792967B1 (en) |
WO (1) | WO2000065207A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110582628A (en) * | 2017-05-03 | 2019-12-17 | 标致雪铁龙汽车股份有限公司 | Method for filtering and correcting oscillation of abundance signal from detector |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2925937B1 (en) * | 2007-12-26 | 2015-04-24 | Renault Sas | METHOD FOR REGENERATING A LOW TEMPERATURE PARTICLE FILTER. |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0424966A1 (en) * | 1989-10-27 | 1991-05-02 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device in variable combination of absorbent and catalyst according to gas temperature |
JPH05149130A (en) * | 1991-11-28 | 1993-06-15 | Nissan Motor Co Ltd | Exhaust emission control device for internal combustion engine |
EP0602963A1 (en) * | 1992-12-16 | 1994-06-22 | Ngk Insulators, Ltd. | Exhaust gas purification method and apparatus therefor |
US5388405A (en) * | 1991-09-30 | 1995-02-14 | Hitachi, Ltd. | System for purifying exhaust gas for use in an automobile |
US5497619A (en) * | 1993-07-06 | 1996-03-12 | Nippon Soken, Inc. | Exhaust gas purification apparatus |
US5657625A (en) * | 1994-06-17 | 1997-08-19 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Apparatus and method for internal combustion engine control |
-
1999
- 1999-04-27 FR FR9905317A patent/FR2792967B1/en not_active Expired - Fee Related
-
2000
- 2000-04-20 EP EP00920853A patent/EP1173660A1/en not_active Withdrawn
- 2000-04-20 WO PCT/FR2000/001037 patent/WO2000065207A1/en not_active Application Discontinuation
- 2000-04-20 JP JP2000613929A patent/JP2002543322A/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0424966A1 (en) * | 1989-10-27 | 1991-05-02 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device in variable combination of absorbent and catalyst according to gas temperature |
US5388405A (en) * | 1991-09-30 | 1995-02-14 | Hitachi, Ltd. | System for purifying exhaust gas for use in an automobile |
JPH05149130A (en) * | 1991-11-28 | 1993-06-15 | Nissan Motor Co Ltd | Exhaust emission control device for internal combustion engine |
EP0602963A1 (en) * | 1992-12-16 | 1994-06-22 | Ngk Insulators, Ltd. | Exhaust gas purification method and apparatus therefor |
US5497619A (en) * | 1993-07-06 | 1996-03-12 | Nippon Soken, Inc. | Exhaust gas purification apparatus |
US5657625A (en) * | 1994-06-17 | 1997-08-19 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Apparatus and method for internal combustion engine control |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 017, no. 544 (M - 1489) 30 September 1993 (1993-09-30) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110582628A (en) * | 2017-05-03 | 2019-12-17 | 标致雪铁龙汽车股份有限公司 | Method for filtering and correcting oscillation of abundance signal from detector |
CN110582628B (en) * | 2017-05-03 | 2022-03-25 | 标致雪铁龙汽车股份有限公司 | Method for filtering and correcting oscillation of abundance signal from detector |
Also Published As
Publication number | Publication date |
---|---|
EP1173660A1 (en) | 2002-01-23 |
JP2002543322A (en) | 2002-12-17 |
FR2792967A1 (en) | 2000-11-03 |
FR2792967B1 (en) | 2001-06-29 |
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