EP3853459A1 - Method for learning a richness correction for a cold engine - Google Patents
Method for learning a richness correction for a cold engineInfo
- Publication number
- EP3853459A1 EP3853459A1 EP19761908.3A EP19761908A EP3853459A1 EP 3853459 A1 EP3853459 A1 EP 3853459A1 EP 19761908 A EP19761908 A EP 19761908A EP 3853459 A1 EP3853459 A1 EP 3853459A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- learning
- cold
- richness
- cor
- 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
- 238000012937 correction Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000005764 inhibitory process Effects 0.000 claims abstract description 26
- 239000000446 fuel Substances 0.000 claims abstract description 23
- 230000004913 activation Effects 0.000 claims abstract description 16
- 239000002826 coolant Substances 0.000 claims abstract description 11
- 238000013475 authorization Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims description 21
- 239000000523 sample Substances 0.000 claims description 13
- 238000005461 lubrication Methods 0.000 claims description 12
- 238000002803 maceration Methods 0.000 claims description 10
- 230000006870 function Effects 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000003213 activating effect Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 239000010705 motor oil Substances 0.000 abstract 1
- 230000033228 biological regulation Effects 0.000 description 5
- 239000012809 cooling fluid Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
- F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
-
- 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
-
- 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
- F02D2200/021—Engine temperature
-
- 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
- F02D2200/023—Temperature of lubricating oil or working fluid
-
- 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
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
Definitions
- the present invention relates to a method of learning a richness correction of a cold engine and more particularly the management of the learning of a richness correction of a cold engine.
- the present invention relates more particularly to a combustion engine with positive ignition, in particular with petrol fuel or containing petrol.
- the present invention can also be applied to a compression ignition engine.
- the heat engine can be integrated in a motor vehicle but this is not limiting.
- a heat engine exhaust line incorporates a three-way oxidation-reduction catalyst, an upstream wealth sensor.
- the internal combustion engine may be a turbocharged engine with automatic fuel injection or be fitted with a VVT or variable valve timing distribution mechanism with two intake and two exhaust valves for each cylinder.
- the control command associated with such an internal combustion engine is composed, among other things, of the following regulation loops: an air intake loop with a butterfly valve or variable setting valves, a fuel loop with one or more injectors of fuel and a fuel pump, advantageously high pressure, a richness regulation being based on a measurement of an upstream richness sensor present in the exhaust line of the heat engine.
- control system is provided with actuator models suitable for hot.
- the control command is also composed of a learning and restitution function for a richness correction for a cold engine, the upstream probe not being operational and the richness regulation being inactive.
- the learned values are saved and classified according to defined parameters, such as, for example, a temperature of the engine coolant at start-up.
- the specific life situation of the short engine stop is a case where learning a cold richness correction can lack robustness.
- the duration of an engine stop is not long enough, all of the fluids will not have time to reach their maceration temperature, for which the temperatures of coolant and lubrication are in line with the outside temperature, considering as negligible the heating of the cooling fluid or of the lubrication oil by thermal thermal insulation possibly provided by a motor vehicle capable of integrating the heat engine.
- the cold correction function is capable of learning a value which is not representative with respect to the condition of the engine. This saved value can penalize the starting, cleaning up and consumption of the engine during its use.
- Document EP-A-2 090 768 describes a device for controlling the air-fuel ratio of an internal combustion engine.
- the controller includes a learning section, a correction section, and an inhibition section.
- the learning section learns, as learning value of the amount of deviation, a constant amount of deviation between a correction amount and its reference value in different ways between a case in which the lift amount region used only when the execution condition is not satisfied and another case in which the lift amount region is in a second lift amount region used only when the condition d execution is satisfied.
- the learning section calculates and stores the relationship between the amount of deviation and the amount of lifting as a function of the learned value of the amount of deviation.
- a correction section calculates the amount of deviation correction value from the stored relationship and corrects the control value of the fuel injection amount using the amount of deviation correction value.
- an inhibition section prevents the amount of lift d 'be shifted from the first lift amount region to another lift amount region.
- the problem underlying the present invention is, for a method of learning a fuel richness correction of a cold engine, not to take a value of a richness correction cold which would be distorted by not reaching a maceration temperature for the fluids circulating in the engine, these fluids having a temperature that is too high compared to an outside temperature prevailing around the heat engine.
- a method for learning a fuel richness correction of a cold engine at a temperature below a predetermined minimum operating temperature of a probe richness positioned in an engine exhaust line, a learned cold correction being calculated according to a learning function operating during a starting of the heat engine after a learning control element has issued a learning authorization according to at least one activation condition, characterized in that the learning authorization is not issued when at least one inhibition condition representative of damage to a maceration in the heat engine is not respected for which at least one coolant, one engine lubricating fluid and one air temperature admitted into the engine have stable temperatures in correspondence with a prevailing outside temperature within a range of less than 20%.
- the invention consists in detecting an insufficient maceration of the vehicle making it possible to inhibit the learning of the corresponding cold correction.
- the maceration of a vehicle corresponds to a state where all the fluids of the engine have a stable temperature, corresponding to the external conditions of the stationary vehicle, subject to taking into account the thermal inertia of the engine.
- the margin stated above takes account of this difference between outside temperature and temperatures of the fluids in the engine.
- the present invention is based on the principle that two exactly identical starts with the same temperature changes for the same outside temperature and, advantageously for all engine fluids, and will require the same cold richness correction. A learned cold correction will therefore be valid for all cases approaching the conditions under which this cold correction was learned.
- the already existing cold richness correction method consists of a steering element or manager grouping together all the conditions allowing the authorization of an apprenticeship.
- the invention provides an additional condition which gives the possibility of inhibiting learning if the maceration of the vehicle is not considered to be sufficient, which would give an incorrect cold richness correction value.
- the performance of the learning process for a cold richness correction is thus improved in robustness by eliminating the false corrections learned in unfavorable life cases.
- said at least one inhibition condition is a duration of an engine stop preceding the start, the duration of the stop being compared to a predetermined threshold, an inhibition condition being issued when the duration of l stop is below the predetermined threshold.
- the inhibition decision can be made from the information of the duration of the engine stop preceding the start. This value is compared to a predefined threshold. If the duration is considered compatible with the threshold, then learning will not be inhibited. In fact, too short a stop time will not allow the temperatures of the lubrication fluid that is the lubrication oil and of the cooling fluid to drop sufficiently to be close to the outside temperature, taking into account the inertia engine thermal.
- said at least one inhibition condition is transmitted to the control element which may or may not inhibit learning. It is therefore the same element that performs activation and inhibition, which represents an economy of means.
- said at least one activation condition is selected from the following conditions taken individually or in combination: a cold start of the engine, rolling less than a predetermined rolling threshold and engine operating stability.
- the cold corrections learned are saved and classified according to at least one coolant and / or lubrication temperature in effect during learning.
- the invention also relates to a method for controlling a richness of fuel injected into a cold engine after starting, a richness probe positioned in an exhaust line of the heat engine having a temperature in force below its temperature predetermined minimum of operation by being inoperative, the richness in force for the cold engine being controlled as a function of a cold richness correction learned for the same outside temperature as that in force, characterized in that the learning process is such as previously described.
- a cold engine delivers insufficiently hot exhaust gases to heat the richness probe and this probe cannot have normal operation without having reached its minimum operating temperature.
- a cold richness correction as provided by the present invention makes it possible to compensate for this deficiency in the richness probe.
- the contribution of the method according to the invention is to limit the cold corrections learned which are false by eliminating them and therefore to make robust the learning method as well as the method of controlling a richness of fuel injected into a cold engine. after starting.
- the cold richness correction learned is selected to have taken place for coolant and / or lubrication temperatures equal to those in force.
- the richness probe reaches at least its predetermined minimum operating temperature or exceeds it, the learned cold richness correction is suspended.
- the invention also relates to an engine control unit implementing such a learning method, the engine control unit comprising an element for controlling a learning of a learned richness correction when cold, a module grouping together at least one learning activation condition transmitting said at least one activation condition to the control element comprising learning activation means and means for calculating the richness correction when cold, the engine control unit comprising means for storing learned richness cold corrections and means for applying a learned cold richness correction to the richness in force following the starting of the engine, characterized in that that the unit includes a grouping module of at least one learning inhibition condition transmitting said at least one inhibition condition the control element including means for inhibiting the learning.
- the solution proposed by the present invention is simple to implement and involves only a software modification, which has a lower cost.
- the present invention aims to help make the start-up, consumption and pollution control services more reliable for any type of driving of the motor vehicle while controlling the cost of the pollution control system.
- the invention finally relates to an assembly of a heat engine with a fuel injection system, an air intake line, an exhaust line and an engine control unit controlling the system of fuel injection, characterized in that the engine control unit is as previously claimed.
- FIG. 1 shows a flowchart of the method for learning a fuel richness correction of a cold engine at a temperature below a predetermined minimum operating temperature of a richness probe positioned in an exhaust line of the heat engine according to the present invention, the method comprising a step of inhibiting learning.
- the present invention relates to a method of learning a fuel richness correction of a cold engine at a temperature below a predetermined minimum operating temperature of a probe. wealth positioned in an engine exhaust line.
- the heat engine may or may not be the engine of a motor vehicle.
- a learned cold correction Cor f ap is calculated C cor R f according to a learning function operating during a starting of the heat engine after a control element UD learning has issued a learning authorization Aut App according to at least one Cond Act activation condition representative of a cold engine.
- the Aut App learning authorization is not issued when at least one condition of inhibition Cond Inh representative of an attack of a maceration in the heat engine is not reached.
- Such maceration is defined for at least one cooling fluid, one engine lubrication fluid and one air temperature admitted into the engine having stable temperatures in correspondence with an outside temperature in force within a range of a few percent. for example by being less than 20%.
- the reference INV above the Cond Inh inhibition condition (s) refers to the contribution of the present invention to the state of the art.
- the margin is chosen to be large enough to allow the fluid temperatures to be higher than the outside air temperature in order to take into account the thermal inertia of the engine which makes the fluid temperatures drop more slowly during a the vehicle stops and which protects the fluids from external conditions, for example from the wind which could lower the fluid temperatures more quickly and bring them closer to the outside temperature.
- the margin is chosen small enough to inhibit any learning of a learned correction Cor f ap at start-up with too large differences between the outside air temperature and the temperatures of the fluids.
- the Cond Inh inhibition condition can be a duration of an engine stop A word before starting, the duration of the stop word being compared to a predetermined threshold, a Cond Inh inhibition condition being issued when the duration of the stop d A word is less than the predetermined threshold.
- This condition can be other or combined with another Cond Inh inhibition condition, for example a condition on the temperature of the coolant or of the lubricating oil.
- the predetermined shutdown duration threshold can be calibrated and lowered when the outside temperature decreases.
- the inhibition condition (s) can be transmitted to the control element UD which inhibits learning or not, as does the activation condition (s).
- the activation condition (s) can be selected from the following conditions, taken individually or in combination: a cold start of the heat engine with a richness probe not ready, taxiing below a predetermined taxiing threshold and stability engine operation mainly. Other conditions may also be considered.
- the cold corrections learned Cor f ap can be saved and classified according to at least one coolant and / or lubrication temperature in effect during learning.
- the cold richness corrections learned Cor f ap correspond best to respective cases.
- the invention also relates to a method of controlling a richness of fuel injected into a cold engine after starting, a richness sensor positioned in an exhaust line of the heat engine having a temperature in force below its temperature predetermined minimum of operation by being inoperative.
- the richness in force for the cold engine is controlled as a function of a cold richness correction learned Cor f ap for the same outside temperature as that in force by implementing a learning process as described above.
- a selection of a cold richness correction learned Cor f ap is made to have a correction classified as having taken place for fluid temperatures. cooling and / or lubrication equal to those in force.
- the richness probe When the richness probe reaches at least its predetermined minimum operating temperature or exceeds it, the cold richness correction learned Cor f ap is suspended. It is then the wealth probe that performs wealth monitoring.
- the invention also relates to an engine control unit implementing such a learning process.
- the engine control unit comprises a control element UD for learning a cold richness correction learned Cor f ap.
- a grouping module of at least one activation condition Cond Act for learning transmits the activation condition (s) to the control element UD comprising means for activating learning.
- the engine control unit comprises means for calculating C cor R f of the cold richness correction Cor f ap, means for memorizing the cold richness corrections learned Cor f ap and means for applying d '' a cold richness correction learned Cor f ap on the richness in force after starting the engine
- the unit comprises a module for grouping one or more learning inhibition conditions transmitting said at least one Cond Inh inhibition condition to the control element UD comprising means inhibition of learning.
- the invention finally relates to an assembly, on the one hand, of a heat engine with a fuel injection system, an air intake line, an exhaust line and, on the other hand , an engine control unit controlling the fuel injection system, the engine control unit being as previously claimed.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1858396A FR3086004B1 (en) | 2018-09-18 | 2018-09-18 | PROCESS FOR LEARNING A RICHNESS CORRECTION OF A COLD ENGINE |
PCT/FR2019/051788 WO2020058584A1 (en) | 2018-09-18 | 2019-07-17 | Method for learning a richness correction for a cold engine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3853459A1 true EP3853459A1 (en) | 2021-07-28 |
Family
ID=63896450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19761908.3A Pending EP3853459A1 (en) | 2018-09-18 | 2019-07-17 | Method for learning a richness correction for a cold engine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3853459A1 (en) |
CN (1) | CN112714823A (en) |
FR (1) | FR3086004B1 (en) |
WO (1) | WO2020058584A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3108948B1 (en) * | 2020-04-07 | 2022-10-21 | Psa Automobiles Sa | METHOD FOR CORRECTING A RICHNESS OF A MIXTURE OF AIR AND FUEL SUPPLYING AN INTERNAL COMBUSTION ENGINE |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3321877B2 (en) * | 1993-03-16 | 2002-09-09 | 日産自動車株式会社 | Engine air-fuel ratio control device |
US7377236B2 (en) * | 2005-09-09 | 2008-05-27 | Ford Global Technologies, Llc | System and method for exhaust heat generation using electrically actuated cylinder valves and variable stroke combustion cycles |
JP4643550B2 (en) | 2006-12-12 | 2011-03-02 | トヨタ自動車株式会社 | Air-fuel ratio control device |
JP4240132B2 (en) * | 2007-04-18 | 2009-03-18 | 株式会社デンソー | Control device for internal combustion engine |
GB2438706A (en) * | 2007-05-02 | 2007-12-05 | Ford Global Tech Llc | A method for controlling the fuelling of an engine. |
JP2009293446A (en) * | 2008-06-03 | 2009-12-17 | Toyota Motor Corp | Engine start control device |
EP2806127B1 (en) * | 2012-01-18 | 2018-07-04 | Toyota Jidosha Kabushiki Kaisha | Control apparatus for an internal combustion engine |
CN106774256B (en) * | 2016-12-17 | 2019-05-03 | 广州汽车集团股份有限公司 | A kind of vehicle cold start automatic calibration system and method |
-
2018
- 2018-09-18 FR FR1858396A patent/FR3086004B1/en active Active
-
2019
- 2019-07-17 CN CN201980061060.5A patent/CN112714823A/en active Pending
- 2019-07-17 WO PCT/FR2019/051788 patent/WO2020058584A1/en unknown
- 2019-07-17 EP EP19761908.3A patent/EP3853459A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
CN112714823A (en) | 2021-04-27 |
FR3086004B1 (en) | 2020-09-11 |
WO2020058584A1 (en) | 2020-03-26 |
FR3086004A1 (en) | 2020-03-20 |
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Owner name: STELLANTIS AUTO SAS |