EP4402354A1 - Procede de pilotage d'un ensemble thermique de vehicule automobile - Google Patents
Procede de pilotage d'un ensemble thermique de vehicule automobileInfo
- Publication number
- EP4402354A1 EP4402354A1 EP22754480.6A EP22754480A EP4402354A1 EP 4402354 A1 EP4402354 A1 EP 4402354A1 EP 22754480 A EP22754480 A EP 22754480A EP 4402354 A1 EP4402354 A1 EP 4402354A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- catalyst
- oxygen
- richness
- control
- stimulated
- 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.)
- Pending
Links
Classifications
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- 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
- F02D41/0295—Control according to the amount of oxygen that is stored on the exhaust gas treating apparatus
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- 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
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
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- 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
- F01N9/00—Electrical control of 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
- F02D41/1438—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
-
- 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
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
-
- 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
- F02D2041/1413—Controller structures or design
- F02D2041/1418—Several control loops, either as alternatives or simultaneous
-
- 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
- F02D2200/0814—Oxygen storage amount
Definitions
- the technical context of the present invention is that of motor vehicle heat engines.
- the invention relates to a method for controlling a motor vehicle thermal assembly, as well as a control unit and a motor vehicle.
- a thermal assembly comprises an engine block formed, for example, of an internal combustion engine and, optionally, of a turbocharger and a catalyst fluidly connected to the engine block via an exhaust line for the exhaust gases from the engine block.
- the engine block makes it possible to produce mechanical energy used to move the motor vehicle forward, by burning fuel stored in a tank of the motor vehicle. During this combustion, the exhaust gases are cooled and evacuated via the exhaust line.
- the catalyst placed on the exhaust line downstream of the engine block, relative to the propagation of exhaust gases, makes it possible to limit the emission of polluting gases.
- the catalyst is the site of chemical reactions.
- thermal assemblies are known in particular comprising a first oxygen sensor - called the upstream sensor - configured to measure a quantity of oxygen present in the exhaust gases coming from from the engine block and in the direction of the catalyst, and a second oxygen sensor - called the downstream sensor - configured to measure the quantity of oxygen present in the exhaust gases extracted from the catalyst.
- a first oxygen sensor - called the upstream sensor - configured to measure a quantity of oxygen present in the exhaust gases coming from from the engine block and in the direction of the catalyst
- second oxygen sensor - called the downstream sensor - configured to measure the quantity of oxygen present in the exhaust gases extracted from the catalyst.
- [9] - a stimulated control of the catalyst defining a catalyst oxygen richness setpoint in the form of a periodic signal of amplitude and frequency and alternating so-called lean richness values and so-called rich richness values.
- the oxygen richness is defined by the ratio between a quantity of fuel and a quantity of oxygen.
- the reducing molecules are in excess in the catalyst.
- the oxidant molecules are in excess in the catalyst.
- a drawback of the known control methods lies in the fact that the oxygen richness determined downstream of the catalyst - via the second oxygen sensor - is the only available measurement that can be linked to the efficiency of the catalyst. However, this measurement is too “late” because differences in richness between the setpoint and the measurement can occur upstream of the catalyst. This results in a form of phase shift between the second control loop and the setpoint upstream of the catalyst. This phase shift has the particular consequence of modifying the equilibrium state of the catalyst when sending oxidants or reducers via the stimulated control. Consequently, this phase shift negatively impacts the efficiency of the catalyst.
- Another drawback of the known control methods lies in the fact that the catalyst stimulation strategy, provided by the stimulated control, is in open loop, that is to say without taking into account what has actually been sent to the catalyst from the information given by the first oxygen sensor.
- the object of the present invention is to propose a new method for controlling a thermal assembly of a motor vehicle in order to respond at least in large part to the previous problems and also to lead to other advantages.
- Another object of the invention is to propose a control method which makes it possible to improve the efficiency and performance of the catalyst.
- Another object of the invention is to limit pollutant emissions downstream of the catalyst.
- At least one of the aforementioned objectives is achieved with a method for controlling a thermal assembly comprising an engine block connected to an exhaust line comprising a catalyst, the assembly comprising a first oxygen sensor - called upstream probe - configured to measure a quantity of oxygen present in an exhaust gas coming from the engine block and in the direction of the catalyst, and a second oxygen sensor - called downstream probe - configured to measuring the quantity of oxygen present in the exhaust gas extracted from the catalyst, the control method comprising:
- this oxygen richness setpoint defined by the stimulated command serves as the first predetermined richness setpoint, this stimulated command of the catalyst being slaved according to the oxygen richness determined upstream of the catalyst via the probe upstream and the second richness setpoint from the second regulation loop.
- the oxygen richness is defined by the ratio between a quantity of fuel and a quantity of oxygen.
- wealth is qualified as poor if the ratio thus calculated is less than 1
- wealth is qualified as rich if the ratio thus calculated is greater than 1 .
- the term “quantity” will be understood interchangeably as a mass quantity or a molar quantity or a volume quantity.
- the present invention now proposes to make the richness setpoint no longer "floating" and predefined according to one or more values not correlated to a real operating state of the catalyst but, on the contrary, to regulate the setpoint oxygen richness defined by the stimulated command as a function of the oxygen measurement carried out by the upstream probe.
- the present invention proposes to add to the first two regulation loops already known a third richness regulation loop which implements a new variable based on the measurement of richness upstream of the catalyst and which thus makes it possible to regulate the average richness upstream of the catalyst.
- the stimulated control is now regulated via this new control loop in order to better manage the quantity of oxidants and reducers in the catalyst while maintaining an alternate stimulated control.
- the stimulated command is no longer regular over time but is modulated in order to allow a better balance of the oxidants and reducers sent to the catalyst.
- this new loop of regulation on the stimulated command leads to permanently adapting the alternation of the rich and lean slots of said stimulated command as a function of the data from the upstream probe in order to optimize the efficiency of conversion of the pollutants in the catalyst.
- the piloting method in accordance with the first aspect of the invention advantageously comprises at least one of the improvements below, the technical characteristics forming these improvements being able to be taken alone or in combination:
- control of the richness setpoint takes the form of the modulation of a duty cycle of the stimulated command.
- an oscillation frequency of the stimulated command is variable.
- the frequency of oscillation of the stimulated command varies between 0.1 Hz and 10 Hz.
- a control variable - called the quantity of oxygen required in the catalyst - and used to define the stimulated command is defined by the formula J(R SP - ⁇ mes) x Qexh x 0.23 x dt where Rsp is the second richness setpoint from the second regulation loop, Rmes is a richness measurement performed by the upstream sensor and Qexh is a value of the mass flow rate of the exhaust line;
- a thermal assembly comprising (i) an engine block, (ii) a catalyst fluidly connected to the engine block via a gas exhaust line exhaust from the engine block, (iii) a first oxygen sensor - called upstream sensor - configured to measure a quantity of oxygen present in the exhaust gases from the engine block and in the direction of the catalyst, (iv) a second oxygen sensor - called downstream sensor - configured to measure the quantity of oxygen present in the exhaust gases extracted from the catalyst, (v) a control unit configured to implement the control method in accordance with the first aspect of the invention or according to any of its improvements.
- the control unit includes calculation means and storage means.
- the control unit is of the type of a computer or a microcontroller.
- a motor vehicle comprising a thermal assembly in accordance with the second aspect of the invention.
- FIG.1 illustrates a schematic view of a motor vehicle according to the third aspect of the invention
- FIG.2 illustrates a schematic view of the piloting process in accordance with the first aspect of the invention.
- FIGURE 1 With reference to FIGURE 1, there is illustrated a motor vehicle 2 in accordance with the third aspect of the invention and comprising a thermal assembly 9 comprising an engine block 3 connected to an exhaust line 5 comprising a catalyst 6.
- the thermal assembly 9 comprises a first oxygen sensor - called upstream sensor 7 - configured to measure a quantity of oxygen present in an exhaust gas from the engine block 3 and in the direction of the catalyst 6.
- the upstream probe 7 is located in an intermediate position between the engine block 3 and the catalyst 6 in order to be able to measure the instantaneous richness in oxygen of the exhaust gases circulating in a part of the exhaust line 5 located between the engine block 3 and catalyst 6.
- the thermal assembly 9 also includes a second oxygen sensor - called downstream sensor 8 - configured to measure the amount of oxygen present in the exhaust gas extracted from the catalyst 6.
- the downstream probe 8 is located in a position such that the catalyst 6 is located between the engine block 3 and the downstream probe 8 in order to be able to measure the instantaneous richness in oxygen of the exhaust gases circulating in a part of the exhaust line 5 behind catalyst 6 relative to engine block 3.
- the thermal assembly 9 also includes a control unit 4 configured to implement a compliant control method 1 as described with reference to FIGURE 2.
- FIGURE 2 illustrates such a piloting method 1 .
- the piloting method 1 comprises: [46] - a first control loop 11 of an oxygen content measured upstream of the catalyst 6 via the upstream oxygen sensor 7, the first control loop 11 being configured to control the thermal assembly 9 upstream of the catalyst 6 so as to regulate the instantaneous richness in oxygen of the exhaust gas entering the catalyst 6 with respect to a first setpoint in predetermined richness;
- the oxygen richness setpoint defined by the stimulated command 13 at the output of the latter serves as the first predetermined richness setpoint at the input of the first regulation loop 11.
- this setpoint of oxygen richness defined by the stimulated control 13 is slaved according to the oxygen richness determined upstream of the catalyst 6 via the upstream probe 7 and of the second predetermined richness setpoint resulting from the second regulation loop. This control forms a third regulation loop.
- the stimulated control 13 is now slaved via the richness measurement by the upstream probe 7 in order to be able to more quickly and more efficiently regulate the average richness upstream of the catalyst 6 by taking into account deviations and/or disturbances richness seen by the upstream probe 7. It is now possible to continuously control an average quantity of oxidants - oxygen - and of reducers - nitric oxide and the hydrocarbons sent to the catalyst 6. Consecutively, the control method 1 in accordance with the invention thus makes it possible to optimize the efficiency of conversion of the pollutants circulating through the catalyst 6. [51] To this end, the invention preferably implements the calculation of a new variable to carry out the piloting of the stimulated control 13.
- This new variable represents a quantity of oxygen solicited OSL in the catalyst 6.
- the quantity of The solicited oxygen OSL is in fact a relevant variable for controlling the richness of the catalyst.
- the amount of oxygen solicited OSL alternatively represents, depending on the state of the catalyst 6, an excess amount of reducer when the richness of the catalyst 6 is rich, or an excess amount of oxygen when the richness of the catalyst 6 is lean.
- the quantity of oxygen solicited OSL in the catalyst 6 is defined by the following formula: 0.23 X dt where Rsp is the second richness setpoint from the second regulation loop 12, Rmes is a richness measurement carried out by the upstream probe 7 and Qexh is a value of the mass flow rate of the exhaust line 5.
- said stimulated command is always centered around 1.
- the richness value minimum and the maximum richness value defined as a function of the quantity of oxygen solicited OSL in the catalyst 6 are symmetrical to each other with respect to 1.
- the stimulated command 13 takes the form of a signal in slots whose duration of said slots is adapted according to the average richness determined via the quantity of oxygen requested 13.
- there quantity of oxygen requested makes it possible to modulate the duty cycle of the stimulated control 13. Consequently, according to the richness value determined by the upstream probe 7, the stimulated control 13 controls the catalyst 6 via a richness control equal to its rich value or at its lean value for a variable duration which depends on the state of richness measured by the upstream probe 7.
- the invention relates to a method 1 for controlling a thermal assembly 9 comprising an engine block 3 connected to an exhaust line 5 along which are successively placed an upstream probe 7, a catalyst 6 and a downstream probe 8.
- the control method 1 cleverly comprises a step of stimulated control 13 of the catalyst consisting of a control in slots of the richness of said catalyst 6, said control in slots alternately taking a rich value and a low value and of which a switching between said rich and low values is determined by a richness measurement by the upstream probe 7.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2109559A FR3127023A1 (fr) | 2021-09-13 | 2021-09-13 | Procede de pilotage d’un ensemble thermique de vehicule automobile |
| PCT/FR2022/051424 WO2023037058A1 (fr) | 2021-09-13 | 2022-07-18 | Procede de pilotage d'un ensemble thermique de vehicule automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4402354A1 true EP4402354A1 (fr) | 2024-07-24 |
Family
ID=77999230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22754480.6A Pending EP4402354A1 (fr) | 2021-09-13 | 2022-07-18 | Procede de pilotage d'un ensemble thermique de vehicule automobile |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4402354A1 (fr) |
| FR (1) | FR3127023A1 (fr) |
| WO (1) | WO2023037058A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2109559A5 (fr) | 1970-03-24 | 1972-05-26 | Snam Progetti | |
| DE4128823C2 (de) * | 1991-08-30 | 2000-06-29 | Bosch Gmbh Robert | Verfahren und Vorrichtung zum Bestimmen des Speichervermögens eines Katalysators |
| DE102004009615B4 (de) * | 2004-02-27 | 2008-03-13 | Siemens Ag | Verfahren zur Ermittlung der aktuellen Sauerstoffbeladung eines 3-Wege-Katalysators einer lambdageregelten Brennkraftmaschine |
| JP6094438B2 (ja) * | 2013-09-27 | 2017-03-15 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
| DE102019118471B3 (de) * | 2019-07-09 | 2020-08-06 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Verfahren zum Betreiben einer Antriebseinrichtung und eine Antriebseinrichtung für ein Kraftfahrzeug |
-
2021
- 2021-09-13 FR FR2109559A patent/FR3127023A1/fr active Pending
-
2022
- 2022-07-18 EP EP22754480.6A patent/EP4402354A1/fr active Pending
- 2022-07-18 WO PCT/FR2022/051424 patent/WO2023037058A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023037058A1 (fr) | 2023-03-16 |
| FR3127023A1 (fr) | 2023-03-17 |
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