EP3619414A2 - Procede de reactualisation d'une dynamique d'adaptation d'une valeur de richesse à une consigne dans un moteur - Google Patents
Procede de reactualisation d'une dynamique d'adaptation d'une valeur de richesse à une consigne dans un moteurInfo
- Publication number
- EP3619414A2 EP3619414A2 EP18724962.8A EP18724962A EP3619414A2 EP 3619414 A2 EP3619414 A2 EP 3619414A2 EP 18724962 A EP18724962 A EP 18724962A EP 3619414 A2 EP3619414 A2 EP 3619414A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- richness
- dynamic
- probe
- dyn
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000446 fuel Substances 0.000 title claims abstract description 14
- 238000012937 correction Methods 0.000 claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000000523 sample Substances 0.000 claims description 84
- 238000011144 upstream manufacturing Methods 0.000 claims description 64
- 230000006978 adaptation Effects 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 13
- 230000004044 response Effects 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000002826 coolant Substances 0.000 claims description 3
- 238000003745 diagnosis Methods 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000003054 catalyst Substances 0.000 description 25
- 239000007789 gas Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000005457 optimization Methods 0.000 description 1
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- 239000000725 suspension Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
-
- 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
- F02D41/1438—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
- F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
-
- 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
- F02D2041/1422—Variable gain or coefficients
-
- 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
- F02D2041/1431—Controller structures or design the system including an input-output delay
-
- 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
- F02D2200/021—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
- F02D2200/04—Engine intake system parameters
- F02D2200/0411—Volumetric efficiency
-
- 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
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural 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
Definitions
- the invention relates to a method for updating a dynamics of adaptation of a measured wealth to a richness setpoint of an air / fuel mixture in a heat engine for a turbocharged engine, for example upstream of a catalyst present in the exhaust line, upstream being taken in the direction of flow of the exhaust gas in the line.
- the present invention is preferably adapted to a spark ignition engine with gasoline and supercharged fuel.
- the name petrol includes a mixture based on gasoline, ethanol or LPG. This is not limiting and the present invention can be adapted to any motorization.
- FIG. 1 which is not limiting of the present invention, there is shown a heat engine 1 turbocharged with a turbine 2 at the output of the engine.
- a catalyst 3 is present on the exhaust line discharging the gases of the engine 1, this catalyst 3 being surrounded by an upstream probe 4a and a downstream probe 4b.
- the catalyst 3 is advantageously a redox catalyst.
- the exhaust line may contain one or more other selective pollution control elements such as a particulate filter, an active or passive nitrogen oxide trap, or for a Diesel engine a selective catalytic reduction system.
- the operation of the engine is controlled by a control unit delivering a set of fuel wealth in the engine at the inlet of each cylinder.
- the process of reactivating the richness value of a probe during an air sweep, the probe being said upstream probe being disposed in an exhaust line at the output of a heat engine, is carried out in the engine on fresh air with unburned air passing through the line.
- a richness regulation of the air / fuel mixture in the engine can therefore be performed according to an estimated wealth estimate at the upstream probe from a predetermined wealth setpoint to the engine and a richness measured by the upstream sensor.
- the upstream probe advantageously proportional, is used to measure the richness upstream of the catalyst and regulate it around a target set by the control unit of the engine control.
- this instruction at the level of the probe is obtained by the use of a model representing the behavior of the system and the probe when the reference of richness to the engine, more precisely the setpoint of wealth at the level of at minus one cylinder of the motor determined by the command control unit, is modified.
- the main difficulty in determining a setpoint of richness at the probe is that there is typically a variable dead time between the setpoint of richness at the engine and the setpoint of richness at the probe as well as a variable response time of the probe according to the operating conditions of the engine, for example the flow of exhaust gas.
- an internal model is most often used to represent the transfer time of the engine gases to the probe as well as the response time of the probe. Such a model is used to convert the wealth setpoint to the injector into a richness setpoint at the probe. This will be more precisely described later.
- the control unit of the engine allows an air sweep on certain phases of life. This consists in allowing fresh air to escape to the exhaust without it being burned by a crossing opening of the valves of the cylinders of the engine. During these phases, the average wealth upstream of the catalyst must favor the reduction of polluting emissions.
- the regulation of the richness upstream of the catalyst will use the measurement of richness given by the upstream sensor. From a richness setpoint for the combustion chamber of the cylinders or the engine richness value, a richness value at the probe can be modeled by a first-order function with delay.
- [001 1] In order to optimize the conversion efficiency of the catalyst pollutants, it can be defined in the richness regulation a setpoint shift of richness to the probe upstream, called a catalyst window which gives a set variation range around the estimated richness setpoint at the upstream probe.
- a regulation by reference of richness to the upstream probe poses three major difficulties.
- the first difficulty is that in the phases in which the air sweep is active, the puffs of oxygen sent to each exhaust valve of a cylinder can modify the behavior of the catalyst for the same set of richness upstream of the catalyst. If the catalyst window is moved, pollutant conversion optimization is no longer ensured.
- the second difficulty is that the level of air swept will also impact the measurement of wealth measured by the probe upstream of the catalyst. Indeed, tests on the drive bench have shown that, for a majority sweep rate range, the higher the sweeping rate, the greater the difference between the measurement of richness given by the upstream probe and that given by an array of analysis during engine bench tuning was high.
- the third difficulty concerns the dynamics of the correction of the wealth deposit as previously mentioned.
- a third difficulty is when it is necessary to adapt the richness setpoint of an air / fuel mixture in a heat engine during a predetermined operating condition of the engine then effective, to have a dynamic adaptation of the specific wealth setpoint that is adapted to this operating condition.
- control means preferably a regulator
- the higher the correction dynamic is and the correction of the estimated wealth error corrected by control means can be done with a risk of occurrence of overruns around the setpoint of wealth regulation and vice versa in the other direction. It is then desirable to regulate the correction dynamics as a function of the operating point of the engine, in particular as a function of the engine speed and the filling rate of the cylinder or cylinders.
- FR-A-3026780 discloses a motor vehicle engine comprising at least one cylinder, an exhaust line, a wealth sensor disposed on the exhaust line, a setpoint determination module of richness at the probe according to a richness guideline in said at least one cylinder.
- the determination module is configured to determine the richness setpoint at the probe using a first calculation rule.
- a regulation module is configured to determine a richness correction to be applied in said at least one cylinder according to a first calculation rule as a function of a value representative of a difference between a richness measured by the probe and the setpoint. of wealth to the probe.
- the problem underlying the invention is to reactualize a wealth guideline of an air / fuel mixture in a heat engine during one or specific operating conditions of the engine requiring a dynamic control of specific richness different from the nominal dynamic used by default.
- a method of updating a dynamic of adaptation of a measured wealth to a set of wealth of an air / fuel mixture in a heat engine when at least one predetermined operating condition of the engine being effective characterized in that a nominal adaptation dynamics of the richness is replaced by an updated reactual dynamic of specific adaptation to the said at least one condition, the said at least one condition being selected in the course of preliminary tests on the engine relating to the adaptation of the predetermined richness setpoint to the engine with a calibration of at least one value of at least one representative operating parameter of the engine that said at least one condition is effective and as soon as said at least one value is detected at a given moment of the operation of the motor, a correction of the nominal dynamic in function of a weighting term to give an updated dynamic as long as said at least one value is detected.
- said at least one condition is taken individually or in combination from the following parameters: a rate of air sweep performed in the engine on fresh air and passing unburned air in an exhaust line at the engine outlet, a temperature of an engine coolant representative of an engine temperature, an implementation of at least one engine diagnosis or the exhaust line, a performing tests on the engine or implementing tests for an adaptation of a model relating to a depollution element or a measurement sensor present in the exhaust line.
- a range of weighting terms is determined for a group of similar tests, each of the weighting terms being associated with one of the tests and used for the correction of the nominal dynamic during this test.
- At least two predetermined operating conditions of the motor are simultaneously effective, each being associated with a respective weighting term, the weighting term selected between the two weighting terms being the lower of the two weighting terms.
- a calibrated weighting term is made available for each condition requiring a specific dynamic.
- the values specific to each of the conditions are compared and the lowest value can be applied, advantageously multiplied, to the nominal dynamic dependence of the operating point, in order to obtain the updated dynamic of the wealth correction performed by a regulator of wealth.
- the measurement sensor is a so-called upstream sensor probe disposed in the exhaust line at the output of a heat engine.
- a wealth regulation is performed by comparing an estimated wealth estimate with the upstream probe from a wealth directive. predetermined to the engine with a richness measured by the upstream probe, one or motor parameters being regulated so that the measured richness follows the estimated wealth value at the upstream sensor.
- the richness setpoint at the upstream probe is modeled from the predetermined wealth setpoint to the engine taking into account, on the one hand, a delay time of the upstream probe depending on the distance between the motor and upstream probe and an exhaust gas velocity at the engine output in force and, secondly, a response time of the specific upstream probe for a richness of 0.63.
- the weighting term is obtained by an x-dimensional map, x being equal to 1 for a single predetermined operating condition or equal to a total number of predetermined operating conditions.
- the weighting term is a multiplicative factor applied to the nominal dynamic.
- the invention also relates to a power train comprising a heat engine and a control unit in charge of the operation of the heat engine with means for regulating a dynamic adaptation of a measured value of wealth to a set point.
- control unit comprises means for implementing such a feedback process, the control unit comprising control means for calibrating the at least one value of at least one operating parameter of the engine representative of at least one predetermined operating condition of the engine requiring, when effective, a correction of the dynamic of adaptation of the richness setpoint, means for calculating the a weighting term to be applied to the dynamics in force to give an updated dynamic and means for tracking said at least one parameter for an application cation of the correction as long as said at least one value of said at least one parameter is effective.
- the control law designed by the present invention is implemented in the wealth control function, which does not require additional hardware.
- Calculation means determine a weighting term as a function of the operating phase or phases of the engine requiring a specific treatment for the dynamics of a richness-in-charge regulator of the wealth correction.
- the invention may be directly adaptable to the exhaust line used, a software solution of the present invention being added to a control law already existing in the control unit.
- the present invention makes it possible to optimize the performance of the engine, in particular for depollution as well as approval services.
- the solution proposed by the present invention is purely software and is easily implemented in the engine control unit and more particularly in the wealth control function upstream of the catalyst by the upstream sensor.
- FIG. 1 is a schematic representation of an assembly of a heat engine and an exhaust line comprising a catalyst and at least one probe positioned upstream of the catalyst, this probe being able to be used to effect a regulation of the in the engine from a richness setpoint, the updating method according to the present invention can be implemented for such a set,
- FIG. 2 shows a logic diagram for implementing the updating method according to the present invention
- FIG. 3 shows an evaluation of the difference in richness between the setpoint of richness and the richness measured as a function of the sweep rate and the engine speed, this evaluation being taken into account in the updating process according to the present invention
- FIG. 4 shows wealth setpoint curves at the engine and at an upstream probe at the engine output in the exhaust line, the estimation of the wealth setpoint at the upstream probe being done according to the engine wealth setpoint. by taking into account a delay time and a response time of the probe, this estimation being done in one embodiment of the feedback process according to the present invention.
- the present invention relates to a method for updating a dynamic of adaptation of a wealth correction, ie a piloting of a measured wealth Med sam probe to a Consrich richness guideline of an air / fuel mixture in a thermal engine 1 at least one predetermined condl condl operating condition of the engine 1 being effective.
- a nominal adaptation dynamics Dyn name of the richness of the med sam probe is replaced by a dynamic updated Dyn end of specific adaptation to the said at least one condition condl to condx.
- Measured wealth Med sam prob is meant to be the actual wealth at the point of measurement at the moment of measurement. This real wealth can also be estimated.
- FIG 4 in a specific non-limiting example of the present invention, it is shown a measured wealth Med probe sam compared to a set of richness Consrich prob with an error Err.
- the correction if the nominal dynamic Dyn correction name is too fast, will be able to oscillate the real wealth around the setpoint of wealth Consrich sond, here a setpoint of wealth to a so-called upstream probe present in an exhaust line of the engine 1 upstream of a catalyst 3, which is not limiting.
- the set value of the engine 1 in fact illustrated by the word Consrich curve, is this figure 4 replaced by the Consrich wealth setpoint probe probe extrapolated from this setpoint wealth to the word Consrich engine, being given that the probe detects the measured med med sam richness, this in order to have a comparison of the Consrich wealth directive and the measured med med sam at the same point of the exhaust line so that this comparison is not distorted.
- the presence of such a probe is however not essential for the implementation of the present invention.
- the nominal dynamic Dyn name may very well not be adapted to the condition or the condl operating conditions specific condx. It may, in the context of the present invention, be several condl condx operating conditions requiring updates of the dynamics, these reactualizations may be different. In this case, a particular embodiment of the present invention may make a selection between the various dynamics in order to choose the reactualization of the dynamics which is the most favorable. This will later be more precisely detailed.
- the condl condx operating condition or conditions requiring a refresh of the nominal dynamic Dyn name when in force during operation of the engine 1 are selected and identified during preliminary engine tests. 1 relating to the adaptation of the preset Consrich wealth directive to the engine 1. For example, it can be seen that the actual richness oscillates too much around the Consrich wealth set point or that certain operating parameters of the engine 1 can not be read because of a nominal dynamic Dyn name not adapted to particular cases due to one or more specific conditions of operation of the engine 1.
- a correction of the nominal dynamic Dyn name is performed as a function of a weighting term Fpond to give a dynamic refreshed Dyn end. This lasts as long as said at least one value is detected.
- the nominal dynamic Dyn name which is the default dynamic when no condl operating condition condx requiring a refresh of the nominal dynamic Dyn Wealth correction name is effective.
- Figure 2 shows an implementation of the present invention.
- This weighting term Fpond is sent to a nominal dynamic Dyn name to give a dynamic updated Dyn end.
- the weighting term Fpond may be a multiplicative factor applied to the nominal dynamic Dyn name, which is preferred.
- the weighting term Fpond can be calibrated according to other parameters than those directly entering the identification of the condl-condx operating condition requiring a refresh of the nominal dynamic Dyn Wealth correction name, for example a speed control. engine or a filling rate of one or engine cylinders, which is not limiting.
- condition or conditions can be taken individually or in combination from the following parameters or derived from the following parameters: a scan rate Tb of air effected in the engine 1 on fresh air and letting pass the air not burned in an exhaust line at the output of the engine 1, a temperature of a coolant of the engine 1 representative of a temperature of the engine 1, an implementation of at least one diagnosis on the engine 1 or the exhaust line, an implementation of tests on the engine 1 or an implementation of tests for an adaptation of a model relating to a pollution control element or a measuring sensor present in the exhaust line.
- the scanning rate Tb In addition to the scanning rate Tb, it can be considered a motor speed. As illustrated in FIG. 3, for the same scanning rate Tb, the richness error Err rich is in smaller absolute value, the lower the engine speed. The engine speed can therefore be taken into consideration as another value associated with a scanning rate Tb, for example to calibrate a weighting term Fpond. This is not mandatory. In Figure 3, it is shown three curves for three different engine speeds namely 1750 revolutions, 1550 revolutions and 1000 revolutions per minute. The dynamics for the correction of a richness error Err may be higher and may no longer correspond to a desired optimum dynamic in a specific condition. This is not essential in the context of the present invention.
- Figure 3 shows an error rich Err richness for different Tb scan rates from -5 to 20%. If one does not take into account the Tb scan rates lower than 5%, it can be seen that two sweeping curves for an RM engine speed of 1750 revolutions per minute and 1550 revolutions per minute are decreasing more and more, the more Tb scan rates are rising and so richness errors of rich Err are getting stronger in absolute value when they are taken starting from 0.
- Rich Err richness errors can reach -2.25 for 20% Tb scan rate for a RM engine speed of 1750 revolutions per minute and -0.25 for 20% Tb scan rate for engine speed RM of 1550 rpm.
- this richness error Err rich is very slightly greater than 0 being at 0.1.
- the correction dynamics of the actual measurement of richness towards the setpoint of richness can therefore vary according to the engine speed taken in combination with one or more other parameters.
- Fpond weighting terms may be associated with one of the tests and used to correct the nominal dynamic Dyn name during this test. There is then individualization of the correction dynamics for a specific test, which is optimal.
- At least two conditional conditions with predetermined condits of the motor 1 can be simultaneously effective while each being associated with a respective weighting term Fpond.
- the weighting term can be selected between the two weighting terms Fpond by being the lower of the two weighting terms Fpond.
- the measurement sensor may be a probe called upstream probe 4a disposed in the exhaust line at the output of a thermal engine 1.
- a wealth regulation can be performed by comparing an estimated Consrich wealth estimate with the upstream probe 4a from a predetermined wealth setpoint to the word Consrich engine with a measured richness Med sam probe by the upstream probe 4a , one or parameters of the engine 1 being regulated so that the measured richness Med sond sam follows the setpoint of richness Consrich probe estimated at the upstream probe 4a.
- the estimated richness set Consrich probe at the upstream probe 4a is modeled from the predetermined wealth setpoint to the word Consrich engine taking into account, on the one hand, a time of delay ttrans of the upstream sensor 4a depending on the distance between the engine 1 and the upstream sensor 4a and an exhaust gas velocity at the output of the engine 1 in force and, on the other hand, a response time of the upstream sensor 4a at a richness of 0.63 or 63% of wealth.
- the modeling is based on the identification of these two characteristic times, the delay time ttrans and the response time treps to 63%. These parameters can be defined according to the operating point and calibrated by mapping.
- the richness R is in the ordinate while a time t is on the abscissa. It is illustrated a setpoint curve with the word Consrich engine and two curves of setpoint of richness with the probe upstream Consrich probe and measurement of the upstream probe Mes sond sam.
- the setpoint of richness with the upstream probe Consrich sond is the instruction of richness of probe filtered and shifted.
- the invention also relates to a power train comprising a thermal engine 1 and a control unit in charge of the operation of the thermal engine 1, the unit being not shown in the figures.
- the control unit comprises means for regulating or controlling a nominal dynamic Dyn adaptation name of a measured value of wealth My sam probes, that is to say a real value at a given moment of wealth, to a set of wealth Consrich sound of the air / fuel mixture in the engine 1 thermal.
- These regulating means can be part of a wealth regulator performing the control of the actual wealth measured towards the wealth set Consrich sond.
- the control unit comprises means for implementing a method for updating the correction dynamics as previously described.
- the control unit comprises means for calibrating at least one value of at least one operating parameter Tb of the engine 1 representative of at least one conditional operating condition with predetermined condx of the engine 1 requiring, when effective, a correction of the dynamic of adaptation of the wealth directive Consrich sond.
- the control unit also comprises means for calculating a weighting term Fpond to be applied to the dynamic in force to give a dynamic updated Dyn end and tracking means of said at least one parameter for application of the correction as said at least one value of said at least one parameter Tb is effective. It is also possible to use a calibrated auxiliary value in relation to the at least one value taken for the updating of the dynamic.
- the powertrain may comprise at least one catalyst 3 integrated in an exhaust line at the output of the thermal engine 1.
- Upstream and downstream 4a and downstream 4b probes are respectively integrated upstream and downstream of the catalyst 3, the upstream probe 4a being able to be used for the correction of a measured wealth Med sond sam towards a Consrich sond richness setpoint.
- the control unit can also be in charge of a depollution in the exhaust line by action on a depollution element.
- the catalyst 3 may be a three-way oxidation-reduction catalyst, the upstream probe 4a a proportional oxygen probe and the downstream probe 4b a binary oxygen probe respectively upstream and downstream of the catalyst.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1753904A FR3065990B1 (fr) | 2017-05-03 | 2017-05-03 | Procede de reactualisation d’une dynamique d’adaptation d’une valeur de richesse a une consigne dans un moteur |
PCT/FR2018/051018 WO2018202977A2 (fr) | 2017-05-03 | 2018-04-24 | Procede de reactualisation d'une dynamique d'adaptation d'une valeur de richesse à une consigne dans un moteur |
Publications (1)
Publication Number | Publication Date |
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EP3619414A2 true EP3619414A2 (fr) | 2020-03-11 |
Family
ID=59381466
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18724962.8A Withdrawn EP3619414A2 (fr) | 2017-05-03 | 2018-04-24 | Procede de reactualisation d'une dynamique d'adaptation d'une valeur de richesse à une consigne dans un moteur |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3619414A2 (fr) |
CN (1) | CN110582627B (fr) |
FR (1) | FR3065990B1 (fr) |
MA (1) | MA50600A (fr) |
WO (1) | WO2018202977A2 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US11813926B2 (en) | 2020-08-20 | 2023-11-14 | Denso International America, Inc. | Binding agent and olfaction sensor |
US11760169B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Particulate control systems and methods for olfaction sensors |
US11828210B2 (en) | 2020-08-20 | 2023-11-28 | Denso International America, Inc. | Diagnostic systems and methods of vehicles using olfaction |
US11760170B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Olfaction sensor preservation systems and methods |
US11932080B2 (en) | 2020-08-20 | 2024-03-19 | Denso International America, Inc. | Diagnostic and recirculation control systems and methods |
US11881093B2 (en) | 2020-08-20 | 2024-01-23 | Denso International America, Inc. | Systems and methods for identifying smoking in vehicles |
US11636870B2 (en) | 2020-08-20 | 2023-04-25 | Denso International America, Inc. | Smoking cessation systems and methods |
US12017506B2 (en) | 2020-08-20 | 2024-06-25 | Denso International America, Inc. | Passenger cabin air control systems and methods |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19844994C2 (de) * | 1998-09-30 | 2002-01-17 | Siemens Ag | Verfahren zur Diagnose einer stetigen Lambdasonde |
JP3610839B2 (ja) * | 1999-09-27 | 2005-01-19 | 株式会社デンソー | 内燃機関の空燃比制御装置 |
JP4380625B2 (ja) * | 2005-11-24 | 2009-12-09 | トヨタ自動車株式会社 | 内燃機関の空燃比制御装置 |
DE102006061682B4 (de) * | 2006-12-28 | 2022-01-27 | Robert Bosch Gmbh | Verfahren zur Vorsteuerung einer Lambdaregelung |
DE102009045792A1 (de) * | 2009-10-19 | 2011-05-12 | Robert Bosch Gmbh | Verfahren und Steuergerät zum Abgleichen von Abgassondensignalen beim Betrieb eines Verbrennungsmotors mit variabler Spülrate |
US9677491B2 (en) * | 2013-08-07 | 2017-06-13 | Ford Global Technologies, Llc | Exhaust gas sensor diagnosis and controls adaptation |
FR3026780B1 (fr) | 2014-10-03 | 2016-12-02 | Peugeot Citroen Automobiles Sa | Moteur a combustion de vehicule automobile a pilotage de richesse ameliore |
-
2017
- 2017-05-03 FR FR1753904A patent/FR3065990B1/fr active Active
-
2018
- 2018-04-24 CN CN201880029701.4A patent/CN110582627B/zh active Active
- 2018-04-24 EP EP18724962.8A patent/EP3619414A2/fr not_active Withdrawn
- 2018-04-24 WO PCT/FR2018/051018 patent/WO2018202977A2/fr unknown
- 2018-04-24 MA MA050600A patent/MA50600A/fr unknown
Also Published As
Publication number | Publication date |
---|---|
FR3065990B1 (fr) | 2021-03-12 |
MA50600A (fr) | 2020-08-12 |
CN110582627B (zh) | 2022-07-22 |
FR3065990A1 (fr) | 2018-11-09 |
CN110582627A (zh) | 2019-12-17 |
WO2018202977A2 (fr) | 2018-11-08 |
WO2018202977A3 (fr) | 2019-01-10 |
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