EP3743603A1 - Procédé d'estimation de la dilution du carburant dans l'huile d'un moteur à combustion interne - Google Patents
Procédé d'estimation de la dilution du carburant dans l'huile d'un moteur à combustion interneInfo
- Publication number
- EP3743603A1 EP3743603A1 EP19700601.8A EP19700601A EP3743603A1 EP 3743603 A1 EP3743603 A1 EP 3743603A1 EP 19700601 A EP19700601 A EP 19700601A EP 3743603 A1 EP3743603 A1 EP 3743603A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- dilution
- fraction
- rate
- engine
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0611—Fuel type, fuel composition or fuel quality
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/11—Oil dilution, i.e. prevention thereof or special controls according thereto
Definitions
- the invention relates to a method for estimating the dilution of the fuel in the oil of an internal combustion engine, more particularly to an engine equipped with a device for treating polluting emissions, which is regenerated periodically by post-combustion. fuel injection into the engine cylinders. It accurately determines the engine drain interval when a fuel dilution threshold in oil is reached
- Document FR-A1-2 974 853 discloses a method for estimating the fuel dilution ratio in the oil of an internal combustion engine equipped with such a device for treating combustion gases requiring regeneration phases by post-injection of fuel, for example a particulate filter.
- the dilution ratio is estimated as a function of the operating mode of the engine:
- the upward variation of the dilution during a period of time considered is calculated as the product of a regeneration function by the time interval considered, this regeneration function being able, for example, , be mapped according to engine parameters such as engine speed and fuel flow.
- the downward variation of the dilution during a time interval is calculated as the product of the opposite of an evaporation function by the time interval considered.
- Evaporation means the vaporization of the fuel in the gases surrounding the engine oil layer.
- the variation of the evaporation between two neighboring instants is calculated according to a kinetic law of order 1, taking into account the time elapsed since the end of the last regeneration.
- the temporal variation of concentration dC / dt is of the type -k'C (t), equation in which k denotes a speed parameter of the evaporation reaction, and C (t) denotes the concentration at the current time, so that the evaporation rate decreases with the time elapsed since the beginning of the normal operating phase, c that is, since the time elapsed since the end of the previous regeneration.
- a method for estimating the fuel dilution ratio in the oil of an internal combustion engine equipped with a flue gas treatment device requiring regeneration phases by post-injection of fuel comprising a step of determining an overall fuel dilution rate.
- a plurality of composition fractions of said fuel are defined, each fraction having a different density, that is to say a lightness that is more or less high, and the process comprises, repeatedly for a succession of instants, an estimate of the dilution rate by adding the dilution rate estimated at the previous instant with a value of variation of the dilution ratio; the variation value of the dilution ratio being calculated based on an estimate of the dilution, between two successive instants, of each fraction of the plurality of composition fractions of said fuel in the oil.
- each composition fraction is associated with a fuel composition rate and a vaporization rate of said fraction, the estimated dilution of each fraction being a function of the overall dilution rate of the fuel, the fuel composition ratio and said vaporization rate of said fraction.
- the dilution ratio can be calculated with relatively simple parameters to be established.
- the vaporization speed of said fraction is a function of the engine torque at the moment considered.
- the determination of the vaporization rate of each fraction can be improved.
- the estimate of the variation of the dilution ratio of each fraction between two successive instants is equal to the product of the overall dilution rate with the rate of composition of the fuel to which the rate of evaporation is subtracted. of said fraction, the whole multiplied by the time interval between the two successive instants.
- the estimation of the dilution ratio is relatively simple to obtain.
- the engine is able to operate according to a regeneration mode, and outside said regeneration mode, said overall dilution rate of the fuel is equal to 0.
- said estimate of the dilution ratio is even simpler to determine and proceeds from a single calculation common to both modes of operation of the engine, with and without regeneration.
- the engine being able to operate according to a regeneration mode, and during said regeneration mode, said overall fuel dilution rate is predetermined as a function of the engine torque and a value representative of the temperature of the engine. engine water.
- said overall dilution rate of the fuel can be obtained relatively simply and reliably.
- the variation of the dilution ratio at each instant is calculated as the sum of the estimates of the dilution of each fraction of the plurality of composition fractions of said fuel in the oil.
- the method is relatively simple, reliable, and inexpensive in computing time.
- the invention also relates to a device for estimating the fuel dilution rate in the oil of an internal combustion engine equipped with a flue gas treatment device requiring regeneration phases by post-fuel injection, according to which the dilution ratio is estimated according to the operating mode of the engine,
- said device comprising means for determining an overall dilution rate of the fuel.
- the device comprises means for defining a plurality of composition fractions of said fuel, each fraction having a different density.
- the device comprises means adapted to estimate, repeatedly for a succession of instants, an estimate of the dilution ratio by adding the dilution ratio estimated at the previous instant with a value of variation of the dilution ratio; the variation value of the dilution ratio being calculated according to an estimate of the variation of the dilution ratio, between two successive instants, of each fraction of the plurality of composition fractions of said fuel in the oil.
- the invention also relates to an engine assembly comprising an internal combustion engine equipped with a combustion gas treatment device and an estimation device as described above.
- the invention also relates to a motor vehicle comprising a motor assembly as described above.
- FIG. 1 schematically represents an internal combustion engine equipped with an exhaust gas treatment device, suitable for carrying out the method according to the invention
- FIG. 2 represents the time evolution of the dilution of the fuel in the oil of such an engine
- FIG. 3 represents the flow diagram of the method for estimating the dilution of the fuel in the oil according to the invention.
- FIG. 4 represents a logic diagram for estimating the method according to the invention.
- FIG. 1 represents an internal combustion engine 1, for example a diesel engine, of which only one cylinder has been drawn in section.
- the engine 1 is here supercharged by a turbocharger 2, and its exhaust gas is treated by a device 3 for treating the exhaust gas.
- the engine 1 is supplied with air by an air circuit comprising an air intake 4, a compressor 5 of the turbocharger 2, and an intake duct 6, one end of which opens into a combustion chamber 7 of the engine.
- the chamber 7 receives at least one injector 8, which injects fuel, for example diesel fuel, into the chamber 7 for combustion with air.
- the exhaust gases produced by the combustion in the chamber 7 are discharged to a turbine 9 of the turbocharger 2 via an exhaust manifold 10.
- the gases pass through the turbine 9, an exhaust pipe 11, and the treatment device 3. They are finally discharged to the outside atmosphere by a muffler 12.
- the treatment device 3 comprises, for example, inside the same outer casing, an oxidation catalyst which continuously oxidizes certain pollutants (unburned HC hydrocarbons and carbon monoxide CO) present in the exhaust gas, and a particulate filter which stores the soot emitted by the engine 1, and burn them when a predetermined mass is reached.
- Two pressure sensors 13 and 14 are respectively located at the inlet and at the outlet of the treatment device 3. The pressure drop between the inlet and the outlet of the treatment device 3 makes it possible indirectly to evaluate the mass of stored soot. in the treatment device 3, more precisely in its particle filter.
- the operation of the engine 1 is controlled by a computer 15 connected to a number of sensors, comprising at least the pressure sensors 13 and 14, and a number of actuators, comprising at least the injector 8 .
- the computer 15 In normal operation of the engine lean mixture, that is to say outside the regeneration phases of the particulate filter, the computer 15 injected into the combustion chamber 7 a fuel quantity corresponding to a torque setpoint.
- This setpoint can be a function of the speed of rotation of the engine and depression of the accelerator pedal (not shown) of the vehicle (not shown) on which is mounted the engine 1.
- the fuel generally begins to be introduced before the top dead center of combustion of each engine cylinder 1, and it is fully burned.
- the treatment device 3 stores the soot emitted by the engine 1 but does not eliminate them.
- the computer 15 triggers a regeneration phase of the treatment device 3 in order to burn the stock of accumulated soot. For this purpose, in addition to the fuel injected into the chamber 7 according to the requested torque setpoint, the computer 15 triggers a fuel injection post-injection.
- Figure 2 illustrates the evolution of the fuel dilution in the engine oil 1 over time.
- the dilution of the fuel that is to say the percentage of fuel contained in the oil, is no.
- the motor is in a normal operating mode, that is to say out of regeneration of the particulate filter.
- a regeneration of the filter is triggered.
- the combustion of soot accumulated in the filter continues until time t 2 .
- the dilution of the oil increases from 0 to a value T 2 .
- the regeneration stops, and there is no further fuel injection into the engine.
- the dilution then decreases under the effect of evaporation of the fuel.
- the decrease continues until time t 3 when a new regeneration is necessary.
- the dilution reaches a value T 3 which is lower than the value T 2 but which does not recover the zero value of the instant to.
- a new regeneration of the filter is triggered.
- the combustion of the soot continues until time t 4 .
- the dilution of the oil increases from T 3 to a value T 4 greater than T 2 .
- the regeneration stops again.
- the dilution decreases until time t 5 when the next regeneration is necessary.
- the dilution decreases from the value T 4 to a value T 5 which remains greater than the value c 3.
- the dilution therefore passes through a succession of alternating phases of increase and decrease, with an overall increase of the level in the long term.
- the duration of the periods during which the filter is not regenerated, successively between t 0 and t 3 , between t 2 and t 3 , and between t 4 and t 5 in FIG. 2, may vary according to the running conditions. (urban, highway, etc.) of the vehicle on which the engine is mounted.
- the dilution values observed at the beginning of each regeneration, respectively T 3 and T 5 in FIG. 2 depend on the duration of these periods, that is to say the time elapsed since the end of each regeneration.
- FIG. 3 represents the flowchart of one embodiment of the method according to the invention.
- the method comprises an initialization step 100, during which the estimation of the dilution ratio T (in mass) is initialized, either at a value of zero if the oil of the engine 1 is new, or at a value which has been stored previously in the computer 15.
- composition fractions of said fuel are defined, each fraction having a density different from the others, that is to say a different lightness.
- Each fraction is associated with a fuel composition rate% Fi,% F2J J % FX , so that the sum of these fractions corresponds to 100% of the fuel.
- composition rates by fuel type vary only negligibly.
- Each fraction Fi, F 2 ,... F x, of fuel also has a vaporization rate of its own V vapoFi , V vapoF2 , V vapoFx , this speed being all the higher as the fraction is light (or less dense).
- the evaporation rate of each fraction Fi, F 2 , ... F x is predetermined, or mapped, in advance as a function of the engine torque C.
- the method comprises a test step 110, during which the computer determines whether a regeneration of the treatment device 3 is in progress, for example by checking the presence of a fuel post-injection. The test then directs to a step 120 if no regeneration is in progress, or to a step 130 in the opposite case.
- step 1 10 the computer also increments and stores in a counter the elapsed time dt, in other words the time step dt, or the time difference dt, since the end of the last calculation of the dilution ratio T of the fuel in the oil.
- the time difference dt corresponds, for a given moment, to the time elapsed between the previous calculation t and the current calculation t + dt.
- the steps 120 and 130 are both intended to calculate a variation value of the dilution ratio dT, in the first case if the regeneration is in progress, and in the other case if the regeneration is not in progress.
- step 120 corresponding to the operating mode of the engine with regeneration activated, the value of variation of the total dilution ratio dT of the fuel in the oil, also called total elementary dilution dT, is calculated as being the sum for each instant t, of the sum of elementary dilutions dT-i, dT 2 , ..., dT x of the plurality of fractions Fi, F 2 , ... F x constituting the fuel at each instant.
- V D is an overall dilution rate of the fuel, which can be mapped according to engine parameters such as rotational speed and fuel flow;
- dt denotes the deviation of time, or no time, between two successive instants t, t + dt of calculation of the dilution ratio T;
- % F £ denotes the fuel composition ratio of the fraction Fi; and t oF / denotes the evaporation rate of the fraction Fi given.
- the time difference dt between the two successive instants may be equal to a conventional computation step of the engine computer, for example about 100 ms. Such a frequency of updating the calculation of the dilution is largely sufficient, the evolution of the dilution being a slow phenomenon.
- the overall dilution rate of the fuel V dN in the context of engine operation in regeneration mode, is predetermined at least as a function of the engine torque and of a value representative of the temperature of the water which characterizes the cold operation or classic hot engine.
- the dilution ratio T is calculated by adding to the dilution ratio Ti (t) of the instant preceding the estimate of the variation of the rate dT during the time step dt carried out at step 120 or 130, so that
- Ti (t + dt) Ti (t + dTi (2)
- the overall elemental dilution dT is firstly calculated from the elementary dilutions DTi of each fraction F1 as follows:
- T (t + dt) T (t) + dt (5)
- the steps for calculating the dilution ratio T (t + dt) are identical to the steps performed during operation in the operating mode. regeneration, and can also be performed according to the two embodiments described above, except that it is then considered that the value of overall dilution rate of the fuel V dil is zero.
- equation (1) for the case of step 130 can be written as follows:
- the method then comprises a step 150 in the course of which the new dilution ratio obtained T (t + dt), also simply written T, is compared with a predetermined threshold S. If it is higher, the method can trigger an alert to the vehicle dashboard during a step 160 of the method, to warn the driver of the vehicle that it is necessary to drain the engine oil. In the opposite case, the flow of a time step dt is expected at step 170, before proceeding to a new calculation step by resuming at step 110.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1850608A FR3077096B1 (fr) | 2018-01-25 | 2018-01-25 | Procede d'estimation de la dilution du carburant dans l'huile d'un moteur a combustion interne |
| PCT/EP2019/051096 WO2019145210A1 (fr) | 2018-01-25 | 2019-01-17 | Procédé d'estimation de la dilution du carburant dans l'huile d'un moteur à combustion interne |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3743603A1 true EP3743603A1 (fr) | 2020-12-02 |
| EP3743603B1 EP3743603B1 (fr) | 2022-03-02 |
Family
ID=61599487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19700601.8A Active EP3743603B1 (fr) | 2018-01-25 | 2019-01-17 | Procédé d'estimation de la dilution du carburant dans l'huile d'un moteur à combustion interne |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3743603B1 (fr) |
| CN (1) | CN111601955B (fr) |
| FR (1) | FR3077096B1 (fr) |
| WO (1) | WO2019145210A1 (fr) |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2236378A5 (fr) * | 1973-07-06 | 1975-01-31 | Peugeot & Renault | |
| JP2004251136A (ja) * | 2003-02-18 | 2004-09-09 | Nissan Motor Co Ltd | 内燃機関の燃料性状推定装置 |
| JP4192677B2 (ja) * | 2003-05-26 | 2008-12-10 | 日産自動車株式会社 | 内燃機関の制御装置 |
| FR2866957B1 (fr) * | 2004-02-27 | 2006-11-24 | Peugeot Citroen Automobiles Sa | Systeme de determination du taux de dilution d'huile de lubrification d'un moteur thermique de vehicule automobile |
| FR2866927B1 (fr) * | 2004-02-27 | 2008-03-07 | Peugeot Citroen Automobiles Sa | Systeme d'aide a la regeneration de moyens de depollution |
| DE602004015068D1 (de) * | 2004-04-14 | 2008-08-28 | Ford Global Tech Llc | Verfahren und Vorrichtung zur Regelung der Ölverdünnung in einer Brennkraftmaschine |
| EP1614870B1 (fr) * | 2004-07-06 | 2011-12-14 | Volvo Car Corporation | Méthode et dispositif pour déterminer le niveau de dilution de carburant dans le lubrifiant d' un moteur à combustion |
| DE102004033414A1 (de) * | 2004-07-10 | 2006-02-02 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens |
| AT413887B (de) * | 2004-11-25 | 2006-07-15 | Avl List Gmbh | Verfahren zum ermitteln der partikelemissionen |
| FR2890411B1 (fr) * | 2005-09-05 | 2010-10-29 | Peugeot Citroen Automobiles Sa | Systeme de determination du taux de dilution de l'huile de lubrification d'un moteur thermique de vehicule automobile par du carburant d'alimentation de celui-ci |
| AU2008236524B2 (en) * | 2007-04-04 | 2010-11-25 | Exxonmobil Chemical Patents Inc. | Production of aromatics from methane |
| FR2914945A3 (fr) * | 2007-04-13 | 2008-10-17 | Renault Sas | Procede d'estimation de la dilution de carburant dans l'huile d'un moteur a combustion interne. |
| KR20090042016A (ko) * | 2007-10-25 | 2009-04-29 | 현대자동차주식회사 | Dpf 탑재 디젤엔진의 엔진오일 교환시기 알림방법 |
| JP2010145107A (ja) * | 2008-12-16 | 2010-07-01 | Nippon Soken Inc | 光学式オイル診断装置ならびに内燃機関の制御装置 |
| DE102009046075B4 (de) * | 2009-10-28 | 2011-06-30 | Ford Global Technologies, LLC, Mich. | Verfahren zum Bestimmen des Anteils an schweren Dieselbestandteilen in einem verdünnten Motoröl |
| GB2480493B (en) * | 2010-05-21 | 2016-06-01 | Gm Global Tech Operations Llc | Method for the estimation of oil viscosity in an internal combustion engine |
| FR2974853B1 (fr) | 2011-05-06 | 2015-05-01 | Renault Sa | Procede d'estimation de la dilution du carburant dans l'huile d'un moteur a combustion interne |
-
2018
- 2018-01-25 FR FR1850608A patent/FR3077096B1/fr not_active Expired - Fee Related
-
2019
- 2019-01-17 WO PCT/EP2019/051096 patent/WO2019145210A1/fr not_active Ceased
- 2019-01-17 EP EP19700601.8A patent/EP3743603B1/fr active Active
- 2019-01-17 CN CN201980007431.1A patent/CN111601955B/zh active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR3077096A1 (fr) | 2019-07-26 |
| CN111601955B (zh) | 2022-06-21 |
| FR3077096B1 (fr) | 2019-12-13 |
| WO2019145210A1 (fr) | 2019-08-01 |
| EP3743603B1 (fr) | 2022-03-02 |
| CN111601955A (zh) | 2020-08-28 |
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