EP3619412A2 - Procede de filtrage d'un signal de richesse issu d'une sonde à l'échappement d'un moteur - Google Patents
Procede de filtrage d'un signal de richesse issu d'une sonde à l'échappement d'un moteurInfo
- Publication number
- EP3619412A2 EP3619412A2 EP18724960.2A EP18724960A EP3619412A2 EP 3619412 A2 EP3619412 A2 EP 3619412A2 EP 18724960 A EP18724960 A EP 18724960A EP 3619412 A2 EP3619412 A2 EP 3619412A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- probe
- engine
- filtering
- richness
- upstream
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000446 fuel Substances 0.000 title claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 60
- 230000010355 oscillation Effects 0.000 claims abstract description 34
- 238000012937 correction Methods 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 238000012986 modification Methods 0.000 claims abstract description 6
- 230000004048 modification Effects 0.000 claims abstract description 6
- 239000000523 sample Substances 0.000 claims description 162
- 239000003054 catalyst Substances 0.000 claims description 18
- 230000004044 response Effects 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 230000006978 adaptation Effects 0.000 claims description 5
- 238000013507 mapping Methods 0.000 claims description 4
- 238000003745 diagnosis Methods 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 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
- 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
- F02D41/02—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
- F02D2041/1431—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
- F02D2041/1413—Controller structures or design
- F02D2041/1432—Controller structures or design the system including a filter, e.g. a low pass or high pass filter
-
- 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
- F02D2200/04—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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
-
- 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
-
- 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 of filtering and correcting the richness signal from a probe during at least one operating condition of the motor creating oscillations of the richness signal and a modification of a model of the probe.
- the probe is a probe disposed in an exhaust line at the output of the heat engine and is called upstream probe because frequently disposed upstream of a catalyst.
- a richness regulation of the air / fuel mixture in the engine is performed according to a setpoint of richness at the upstream probe corrected by the probe model from a pre-determined wealth setpoint to the engine and at least one parameter. of operation of the probe, and a richness measured by the upstream probe filtered by a first filtering.
- 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 fuel wealth instruction in the engine at the inlet of each cylinder.
- a richness regulation of the air / fuel mixture in the engine can therefore be carried out according to a wealth guideline estimated at the upstream probe from a setpoint of predetermined wealth to the engine and a richness measured by the upstream sensor.
- the upstream probe is used to measure the richness upstream of the catalyst and regulate it around a set point set by the control unit of the engine control.
- this instruction at the probe is obtained by the use of a probe model representing the behavior of the system and the probe when the setpoint of wealth to the engine, more precisely the setpoint of richness at the level of the probe. at least one cylinder of the engine determined by the 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 probe. 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. In order to optimize the conversion efficiency of the pollutants of the catalyst, it can be defined in the richness regulation a richness reference offset to the upstream probe, called catalyst window which gives a set variation range around the estimated wealth value at the upstream probe. Regulation by richness of reference to the upstream probe poses a major difficulty. This difficulty arises, for example, in the phases where the air sweep is active or in other operating conditions of the engine in which flushes of oxygen are created in the engine and sent into the exhaust line.
- Figure 3 shows oscillations Rich Richness signal as a function of time t for different scanning rates ranging from 5 to 30%. The higher the scan rate, the richness signal with the highest scan rate being marked by the curve with squares and the richness signal with the lowest scan rate being marked by the curve with stars, the greater the amplitude of the oscillations is strong.
- the filtering may delay the richness signal of the probe and thus involve a modification of the probe model, in which at least one parameter of the probe is taken into account to make the connection between the richness setpoint at the probe. motor with the richness setpoint at the probe. It can for example be taken into consideration two parameters of the probe that are the delay time of the probe due to its removal from the engine and its inherent response time. This change will be perceived by the regulator as a measurement error that the latter will seek to correct, wrongly.
- 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 wealth measured by the probe and the richness setpoint at the probe.
- a first calculation rule as a function of a value representative of a difference between a wealth measured by the probe and the richness setpoint at the probe.
- This document does not, however, relate to filtering and correction of the richness signal measured at a probe during at least one operating condition of the motor creating oscillations of the richness signal.
- the problem underlying the invention is to reduce or completely eliminate the oscillations occurring on a richness signal of an air / fuel mixture measured by a probe disposed in the exhaust line to the output of a combustion engine during one or more specific operating conditions of the engine as well as to reactualize the probe model making it possible to match a reference of richness to the engine with a setpoint of wealth measured at the level of the probe.
- a method for filtering and correcting a richness signal measured by a probe during at least one operating condition of the motor creating oscillations of the wealth signal measured and a modification of a model of the probe, the probe being said upstream sensor being disposed in an exhaust line at the output of a heat engine, a wealth control of the air / fuel mixture in the engine being carried out according to a setpoint of richness at the upstream probe corrected by the probe model from a predetermined wealth setpoint at the engine and at least one operating parameter of the probe, and the richness measured by the upstream probe filtered by a first filtering, characterized in that said at least one operating condition of the motor creating oscillations of the measured richness is identified during prior engine tests relating to adapting the predetermined wealth setpoint to the motor with storage of at least one value of at least one operating parameter of the engine representative 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, the first filter
- the technical effect is to implement a second filtering different from the first filtering or nominal filtering. This makes it possible to reduce and even eliminate the oscillations of richness introduced by the presence of the operating condition of the motor creating these oscillations, for example but not only an air sweep.
- the use of a specific calibration for the probe model will make it possible to better adapt the setpoint of richness to the probe that will be regulated.
- a control law according to the present invention is implemented in a richness control function by a probe in the exhaust line.
- the second filtering of the richness measure will eliminate the oscillations on the measured wealth signal.
- the oscillation frequency is always equal to that of the motor cycles essentially corresponding to a fresh air pulsation at each exhaust of the cylinders. The adjustment of the second filter is thus facilitated.
- the first filtering is a first order filtering and the second filtering is a second order filtering and said at least one parameter of the probe is corrected according to a filling ratio of at least one engine cylinder and engine speed.
- the second filter has a natural frequency proportional to a current engine speed at a given time with a calibrated coefficient.
- said at least one parameter of the probe is corrected by mapping.
- the parameters of the probe are two in number being respectively a delay time of the upstream probe depending on the distance between the engine and the upstream probe and an exhaust gas velocity at the output of the engine in force and on the other hand, a response time of the specific upstream probe for a richness of 0.63.
- the delay time and the response time are corrected simultaneously in parallel independently of one another.
- the maps of delay times and response times can be duplicated in order to calibrate and adapt these characteristic times when using the second filtering of the richness measured at the probe.
- said at least one operating condition of the engine is taken individually or in combination from the following parameters: an air sweep with, as parameter, an air sweep rate, the air sweep being carried out in the engine on fresh air and allowing unburned air to pass through an exhaust line at the outlet of the engine, an implementation of at least one diagnosis on the engine or the exhaust line and a performing engine tests or testing implementation for adaptation of a model relating to a pollution control element or a measurement sensor present in the exhaust line.
- the operating conditions creating oscillations of the signal of wealth measured at the probe become more and more numerous and it is quite possible in the future to have new conditions to consider for the filtering of the measured wealth and the correction of the probe model.
- a natural frequency of the second filtering depends on the swept air rate and the engine speed.
- the invention also relates to a power train comprising a heat engine, an exhaust line comprising at least one catalyst with upstream and downstream sensors and a control unit in charge of the operation of the engine and a depollution in the exhaust line, characterized in that the control unit comprises means for implementing such a method for filtering and correcting the richness signal from the upstream sensor.
- the invention being adaptable to the exhaust system used and being added to an already existing control law, it optimizes the performance of the engine for pollution abatement benefits and possibly approval.
- the use of an air sweep will continue on future engines and the performance requirements of the wealth regulation will be increased so the use of this invention will be essential. The same goes for the implementation of tests with possible creation of oscillations in the richness signal measured at the probe.
- the invention can 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 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 richness signal filtering and correction method according to the present invention can be implemented for such a set,
- FIG. 2 shows a logic diagram for implementing the filtering and correction method according to the present invention for calculating each parameter of the probe model that may have been modified by the oscillations of the richness signal
- FIG. 3 shows several curves of evolution of richness over time as a function of different scanning rates, these evolution curves exhibiting oscillations which the present invention intends to reduce or eliminate,
- FIG. 4 shows wealth reference curves to the engine and an upstream probe at the engine output in the exhaust line, as well as a wealth curve measured at the probe, the estimation of the wealth setpoint at the upstream probe being made according to the setpoint of richness to the engine by taking into account a delay time and a response time of the probe, this estimation being done in one embodiment of the method of filtering and correcting the wealth signal according to the present invention.
- the present invention relates to a method of filtering and correcting the measured wealth signal My sam probe from a probe during at least one motor operating condition creating oscillations of the measured wealth signal My sam probes and a modification of a probe model.
- the probe is called upstream probe 4a being disposed in an exhaust line at the outlet of a thermal engine 1 and preferably upstream of a catalyst 3.
- a richness regulation of the air / fuel mixture in the engine 1 is carried out according to a setpoint of richness Consrich probe at the upstream probe 4a corrected by the probe model from a pre-determined wealth setpoint to the engine Consrich word and at least one parameter ttrans, operating hours of the probe 4a, and a measured richness My sam probes by the upstream probe 4a filtered by a first filtering or nominal filtering, shown in Figure 2 under the reference Carto 2D last name. It is preferred that there are two parameters ttrans, the operating time of the probe 4a to be corrected, parameters which will be subsequently detailed.
- 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 wealth Consrich prob Err with error. Flushes of oxygen from the thermal engine 1 can oscillate the real wealth measured Med sam sam. It is therefore necessary to eliminate or reduce as much as possible these oscillations.
- the set value of the engine 1, in fact illustrated by the word Consrich curve, is in 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.
- said at least one operating condition of the engine creating oscillations of the signal signal of wealth Med probe sam is identified during preliminary tests on the engine 1 relating to the adaptation of the setpoint of wealth Consrich sond predetermined to the engine 1. This can be done by testing for example on engine bench.
- This second filtering is referenced Carto2D filt.
- the first and second filtering are thus used alternately according to the detection of an operating condition of the motor causing or not the appearance of oscillations of the measured richness at the probe 4a. It is carried out a correction of the parameter (s) ttrans, trips of the probe 4a as long as the said at least one value is detected.
- the detection of an operating condition involving or not the creation of oscillations is referenced Activ filt. If no operating condition involving the creation of oscillations is detected, it is proceeded to the first filtering said nominal filtering Carto 2D name and the nominal calculation of said at least one parameter of the probe ttrans, treps. On the other hand, if an operating condition involving the creation of oscillations is detected, the second filtering Carto 2D filt is carried out different from the first filtering and a refreshing of one or more parameters of the probe ttrans, treps.
- maps used for the nominal probe model are duplicated. These new maps have specific support points and are calibrated for each application, according to the second calibrated filtering.
- the selection of a model between nominal model and model corrected during oscillations of the measured wealth signal is performed by a boolean indicating the activation state of the filtering of the measured wealth signal My sam probes to the probe 4a.
- the first filtering may be a one-order filtering and the second filtering may be a two-order filtering.
- the parameter (s) ttrans, trips of the probe 4a can be corrected according to a filling rate of at least one cylinder of the engine Remp and an engine RPM.
- the second filtering may have a natural frequency proportional to a current engine speed at a given time with a calibrated coefficient.
- the parameter (s) ttrans, treps of the probe 4a can be corrected by a map, advantageously a 2D map. There can be a mapping associated with each of the parameters ttrans, treps of the probe 4a.
- the estimated richness set Consrich sond at the upstream probe 4a can be modeled from the predetermined wealth setpoint at the word Consrich engine taking into account, on the one hand, a delay time ttrans of the upstream probe 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 probe upstream 4a at a richness of 0.63 or corresponding to 63% of wealth.
- the modeling is therefore 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. In this FIG.
- the richness R is on the ordinate while a time t is on the abscissa. It is illustrated a setpoint curve with the word Consrich motor and two wealth setpoint curves at the upstream probe Consrich sond and the measured richness of the upstream probe. My sam probes.
- the richness setpoint at the upstream probe Consrich sond is the setpoint of richness of probe filtered and shifted. An error Err is present between the two curves of the probe richness setpoints, respectively measured My sam probe and filtered Consrich sond.
- the estimated richness set Consrich probe at the upstream probe 4a from the wealth of the engine 1 is filtered, advantageously by a filter of order 1.
- the operating conditions of the engine 1 capable of creating oscillations of the signal richness of Med sam probe can be determined by tests during the development of the engine. Without being limiting, the condition or conditions can be taken individually or in combination from the following parameters: an air sweep with, as parameter, an air sweep rate, the air sweep being carried out in the engine 1 over the fresh air and passing unburned air in an exhaust line at the output of the engine 1, an implementation of at least one diagnosis on the engine 1 or the exhaust line and an implementation test work on the engine 1 or an implementation of tests for an adaptation of a model relating to a pollution control element 3 or to a measurement sensor 4a, 4b present in the exhaust line.
- the creation of oscillations on the richness measured at the probe has been illustrated in FIG.
- a clean frequency of the second filtering may depend on the swept air rate and the engine speed RM.
- the invention also relates to a power unit comprising a thermal engine 1, an exhaust line comprising at least one catalyst 3 with 4a upstream and 4b downstream sensors and a control unit in charge of the operation of the thermal engine 1 and a depollution in the exhaust line.
- control unit includes means for implementing such a method of filtering and correcting the richness signal My sam probe from the upstream probe 4a.
- the upstream probe 4a may be a proportional oxygen probe and the downstream probe 4b may be a binary oxygen probe.
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- 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)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1753906A FR3065992A1 (fr) | 2017-05-03 | 2017-05-03 | Procede de filtrage et de correction d’oscillations d’un signal de richesse issu d’une sonde en sortie d’un moteur |
PCT/FR2018/051016 WO2018202975A2 (fr) | 2017-05-03 | 2018-04-24 | Procede de filtrage et de correction d'oscillations d'un signal de richesse issu d'une sonde en sortie d'un moteur |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3619412A2 true EP3619412A2 (fr) | 2020-03-11 |
EP3619412B1 EP3619412B1 (fr) | 2021-01-13 |
Family
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Application Number | Title | Priority Date | Filing Date |
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EP18724960.2A Active EP3619412B1 (fr) | 2017-05-03 | 2018-04-24 | Procede de filtrage d'un signal de richesse issu d'une sonde à l'échappement d'un moteur |
Country Status (4)
Country | Link |
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EP (1) | EP3619412B1 (fr) |
CN (1) | CN110582628B (fr) |
FR (1) | FR3065992A1 (fr) |
WO (1) | WO2018202975A2 (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 |
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 |
US11828210B2 (en) | 2020-08-20 | 2023-11-28 | Denso International America, Inc. | Diagnostic systems and methods of vehicles using olfaction |
US12017506B2 (en) | 2020-08-20 | 2024-06-25 | Denso International America, Inc. | Passenger cabin air control systems and methods |
US11932080B2 (en) | 2020-08-20 | 2024-03-19 | Denso International America, Inc. | Diagnostic and recirculation control systems and methods |
US11760169B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Particulate control systems and methods for olfaction sensors |
US11760170B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Olfaction sensor preservation systems and methods |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2634823B1 (fr) * | 1988-07-27 | 1990-11-23 | Bendix Electronics Sa | Procede et dispositif de regulation de la richesse d'un melange air-carburant d'alimentation d'un moteur a combustion interne |
JPH04321740A (ja) * | 1991-04-19 | 1992-11-11 | Mitsubishi Electric Corp | エンジンの空燃比制御装置 |
US5363647A (en) * | 1992-10-13 | 1994-11-15 | Mitsubishi Denki Kabushiki Kaisha | Dual-sensor type air fuel ratio control system for internal combustion engine and catalytic converter diagnosis apparatus for the same |
US5656765A (en) * | 1995-06-28 | 1997-08-12 | General Motors Corporation | Air/fuel ratio control diagnostic |
JP3373724B2 (ja) * | 1996-04-05 | 2003-02-04 | 本田技研工業株式会社 | 内燃機関の空燃比制御装置 |
US5996337A (en) * | 1998-02-06 | 1999-12-07 | Engelhard Corporation | Dynamic calorimetric sensor system |
DE19844994C2 (de) * | 1998-09-30 | 2002-01-17 | Siemens Ag | Verfahren zur Diagnose einer stetigen Lambdasonde |
FR2792967B1 (fr) * | 1999-04-27 | 2001-06-29 | Renault | Procede de commande de la richesse du melange air/carburant d'un moteur a combustion interne debitant des gaz d'echappement dans une ligne equipee d'un piege a hydrocarbures |
US6233922B1 (en) * | 1999-11-23 | 2001-05-22 | Delphi Technologies, Inc. | Engine fuel control with mixed time and event based A/F ratio error estimator and controller |
DE10047811A1 (de) * | 2000-09-27 | 2002-04-18 | Volkswagen Ag | Verfahren und Vorrichtung zur Regelung einer Verbrennungskraftmaschine |
FR2891010B1 (fr) * | 2005-09-21 | 2007-10-26 | Renault Sas | Procede de traitement d'un signal de mesure representatif de la richesse en oxygene d'un gaz et dispositif correspondant |
US9416714B2 (en) * | 2012-03-01 | 2016-08-16 | Ford Global Technologies, Llc | Non-intrusive exhaust gas sensor monitoring |
DE102013201734A1 (de) * | 2013-02-04 | 2014-08-07 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Lambdasondenanordnung im Abgassystem einer Brennkraftmaschine |
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 FR1753906A patent/FR3065992A1/fr active Pending
-
2018
- 2018-04-24 EP EP18724960.2A patent/EP3619412B1/fr active Active
- 2018-04-24 WO PCT/FR2018/051016 patent/WO2018202975A2/fr unknown
- 2018-04-24 CN CN201880029724.5A patent/CN110582628B/zh active Active
Also Published As
Publication number | Publication date |
---|---|
FR3065992A1 (fr) | 2018-11-09 |
WO2018202975A2 (fr) | 2018-11-08 |
CN110582628A (zh) | 2019-12-17 |
WO2018202975A3 (fr) | 2019-01-03 |
EP3619412B1 (fr) | 2021-01-13 |
CN110582628B (zh) | 2022-03-25 |
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