EP4100636A1 - Dispositif d'injection de carburant, moteur et procede associe - Google Patents
Dispositif d'injection de carburant, moteur et procede associeInfo
- Publication number
- EP4100636A1 EP4100636A1 EP21704730.7A EP21704730A EP4100636A1 EP 4100636 A1 EP4100636 A1 EP 4100636A1 EP 21704730 A EP21704730 A EP 21704730A EP 4100636 A1 EP4100636 A1 EP 4100636A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measurement
- engine
- control unit
- injection
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002347 injection Methods 0.000 title claims abstract description 74
- 239000007924 injection Substances 0.000 title claims abstract description 74
- 239000000446 fuel Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 22
- 238000005259 measurement Methods 0.000 claims abstract description 98
- 238000004891 communication Methods 0.000 claims abstract description 25
- 230000003068 static effect Effects 0.000 claims description 38
- 230000004913 activation Effects 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 2
- 238000004458 analytical method Methods 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 230000032683 aging Effects 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- PXFBZOLANLWPMH-UHFFFAOYSA-N 16-Epiaffinine Natural products C1C(C2=CC=CC=C2N2)=C2C(=O)CC2C(=CC)CN(C)C1C2CO PXFBZOLANLWPMH-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
- F02D41/182—Circuit arrangements for generating control signals by measuring intake air flow for the control of a fuel injection device
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/32—Controlling fuel injection of the low pressure type
- F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/32—Controlling fuel injection of the low pressure type
- F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration
- F02D41/345—Controlling injection timing
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/401—Controlling injection timing
-
- 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
- F02D2200/0406—Intake manifold pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
-
- 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
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/703—Atmospheric pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- TITLE Fuel injection device, engine and associated process. Technical area
- the present invention relates to an injection device for a heat engine. It also relates to a motor system equipped with such a device and a method implemented by such a device.
- Such a device allows a user to improve fuel injection into an engine.
- the field of the invention is more particularly that of internal combustion heat engines.
- the aim of the present invention is to resolve at least one or more of these drawbacks.
- an injection device for a heat engine comprising:
- a flowmeter or a pressure or speed sensor arranged to be positioned in or in communication with an intake distributor and arranged and / or programmed to provide a measurement which depends on an air flow circulating in the distributor of admission
- control unit arranged and / or programmed to control a fuel injection, characterized in that the control unit is arranged and / or programmed to receive and analyze the measurement from the flowmeter, or from the pressure sensor or from the sensor speed, and, as a function of the measurement, calculating a control arranged to control a fuel injector so as to control the injection of a quantity of fuel which depends on the measurement.
- the control unit is preferably arranged and / or programmed to receive and analyze the measurement coming from the flowmeter or from the pressure or speed sensor, and, according to the measurement, calculate the command arranged to control the injection by the injection. 'injector for a period of activation of the injector which depends on the measurement.
- the control for example to control the injector and / or to control the injection by the injector (instant of start of injection and / or duration of activation of the injector), can be arranged so as not to take into account has a position of a crankshaft condition mechanically connected to the movement of at least one piston in the engine or other moving part in the engine.
- the position of a crankshaft condition may include an angle and / or an angular position of the crankshaft and / or a rotation of said crankshaft.
- the control unit is preferably arranged and / or programmed to receive and analyze the measurement from the flowmeter or from the pressure or speed sensor, and, depending on the measurement, to calculate the ordered command. to control injection by the injector from an injection start instant which depends on the measurement.
- the control unit is preferably arranged and / or programmed to calculate the instant of the start of injection so that this instant corresponds to a time when a maximum air flow rate plus or minus a percentage, lower occurs in the distributor. or equal to 30%, preferably less than or equal to 15%, of a period of the engine cycle.
- the control unit is preferably arranged and / or programmed to calculate an engine speed as a function of the measurement coming from the flowmeter or from the pressure or speed sensor.
- the control unit is preferably arranged and / or programmed to calculate the mass flow rate of air circulating in the intake manifold as a function of the measurement coming from the flow meter or from the pressure or speed sensor.
- the flowmeter may include a mass flowmeter.
- the control unit is preferably arranged and / or programmed so that the calculation of the command does not include the use of an engine map or of a correspondence table and / or includes a resolution of at least one equation by software and / or electronic calculation means.
- the flowmeter or the pressure or speed sensor is preferably arranged and / or programmed to repeat its measurement at a frequency (depending on the engine cycle) of at least 2 Hz (for example for a single-cylinder 4-stroke engine), preferably d 'at least 20 Hz, more preferably at least 100 Hz (for example for a two-stroke twin-cylinder engine).
- the control unit is preferably arranged and / or programmed to repeat the calculation of the control at a frequency (depending on the engine cycle) of at least 2 Hz (for example for a single-cylinder 4-stroke engine), preferably at least minus 20Hz, more preferably at least 100 Hz (for example for a 2-stroke twin-cylinder engine).
- the device may include:
- an air temperature sensor arranged to provide an air temperature in the distributor and arranged to be positioned in or in communication with the intake distributor, the control unit being arranged and / or programmed to take this air temperature into account at least for the calculation of the command, and / or
- a static pressure sensor arranged to provide a static pressure of the air in the distributor and arranged to be positioned in or in communication with the intake distributor, the control unit being arranged and / or programmed to take into account this static pressure at least for the calculation of the order.
- the device may include a temperature sensor arranged to measure a temperature of the engine, the control unit being arranged and / or programmed to take this engine temperature into account at least for the calculation of the command.
- the measurement coming from the flowmeter or from the pressure or speed sensor is preferably arranged to take account of the direction of air circulation in the intake manifold.
- the device according to the invention can include the fuel injector.
- the device according to the invention can include the intake distributor.
- the flowmeter or the pressure or speed sensor is preferably positioned in the intake manifold.
- the device according to the invention may comprise means arranged to form a local pressure drop in the intake manifold, and in that the flowmeter or the pressure or speed sensor is arranged to take its measurement at the level of this drop. local pressure.
- a system is proposed comprising:
- the intake distributor of the device according to the invention being the intake distributor of said engine and being arranged to convey air into the engine, the fuel injector being arranged to inject fuel into said engine or in the intake distributor.
- an injection method for a heat engine comprising: - b -
- a flowmeter or a pressure or speed sensor positioned in or in communication with an intake distributor, of a measurement which depends on an air flow rate circulating in the intake distributor, the distributor inlet conveying air into an engine, - a control, by a control unit, of fuel injection into the engine, characterized in that the control unit receives and analyzes the measurement from the flowmeter, or of the pressure sensor or of the speed sensor, and, depending on the measurement, calculates a command which controls the injection, by a fuel injector, of a quantity of fuel which depends on the measurement.
- control unit receives and analyzes the measurement coming from the flowmeter or from the pressure or speed sensor, and, depending on the measurement, calculates the command so as to control the injection by the injector for a period of time. activation of the injector which depends on the measurement.
- the control for example to control the injector and / or to control the injection by the injector (instant of start of injection and / or duration of activation of the injector), does not take into account a position of a crankshaft state mechanically connected to the movement of at least one piston in the engine or other moving part in the engine.
- the position of a crankshaft condition may include an angle and / or an angular position of the crankshaft and / or a rotation of said crankshaft.
- the control unit receives and analyzes the measurement coming from the flowmeter or from the pressure or speed sensor, and, depending on the measurement, calculates the command so as to control the injection by the injector from 'a start time of injection which depends on the measurement.
- the injection start time is calculated by the control unit so as to correspond to a time when a maximum air flow rate plus or minus a percentage, less than or equal to 30%, occurs in the distributor, preferably less than or equal to 15%, of a period of the engine cycle.
- the control unit calculates an engine speed as a function of the measurement from the flowmeter or from the pressure or speed sensor.
- control unit calculates the mass flow rate of air circulating in the intake manifold as a function of the measurement coming from the flowmeter or from the pressure or speed sensor.
- the flowmeter comprises a mass flowmeter.
- the calculation of the command by the control unit does not include the use of an engine map or of a correspondence table and / or comprises a resolution of at least one equation by software calculation means. and / or electronic.
- the flowmeter or the pressure or speed sensor repeats its measurement at a frequency (depending on the engine cycle) of at least 2Hz (for example for a single-cylinder 4-stroke engine), preferably of at least 20Hz, of more preferably at least 100 Hz (for example for a 2-stroke twin-cylinder engine) and / or in that the control unit repeats the calculation of the command at a frequency (depending on the engine cycle) of at least 2 Hz (for example for a single-cylinder 4-stroke engine), preferably at least 20 Hz, more preferably at least 100 Hz (for example for a 2-stroke twin-cylinder engine).
- the method according to the invention comprises:
- control unit taking into account this air temperature at the minus for the calculation of the order, and / or - a supply of a static pressure of the air in the distributor by a static pressure sensor positioned in or in communication with the intake distributor, the control unit taking take this static pressure into account at least for the calculation of the order.
- the method according to the invention comprises a supply, by a temperature sensor, of an engine temperature, the control unit taking this engine temperature into account at least for the calculation of the command.
- the measurement from the flowmeter or from the pressure or speed sensor takes account of the direction of air circulation in the intake manifold.
- the flowmeter or the pressure or speed sensor is positioned in the intake manifold, and in that it comprises a formation of a local pressure drop in the intake manifold, and in that the The flowmeter or the pressure or speed sensor measures this local pressure drop.
- FIG. 1 illustrates a first embodiment of system 1 according to the invention (which is a preferred embodiment) comprising a first embodiment of device 2 according to the invention
- FIG. 2 illustrates a first variant of sensor 3 for the first embodiment of system 1 according to the invention
- Figure 3 illustrates a curve of mass air flow Qmair in distributor 4 of system 1 as a function of time t for several cycles of engine 6, allowing unit 5 of system 1 to determine an engine cycle period ,
- FIG. 4 illustrates this same curve of mass air flow Qmair as a function of time t for several cycles of the engine 6, allowing the unit 5 of the system 1 to determine an instant of start of fuel injection into the engine 6 of system 1,
- FIG. 5 illustrates a first embodiment of the method according to the invention, which is a preferred embodiment, and which can be used in particular in the form of four illustrated variants.
- variants of the invention comprising only a selection of characteristics described or illustrated below isolated from the other characteristics described or illustrated (even if this selection is isolated within a sentence comprising these other characteristics), if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art.
- This - o - selection comprises at least one preferably functional characteristic without structural details, and / or with only part of the structural details if this part alone is sufficient to confer a technical advantage or to differentiate the invention from the state of prior art.
- a first embodiment of the system 1 according to the invention comprising a device 2 according to the invention and implementing a first embodiment of the method according to the invention will first of all be described with reference to FIGS. 1 to 5. invention.
- the injection device 1 for a heat engine 6 comprises:
- a sensor 3 comprising a flowmeter (preferably mass) or a pressure (preferably differential pressure) or speed sensor, and arranged to be positioned in or in communication with an intake distributor 4 and arranged and / or programmed to provide "in real time" a measurement or a signal 16 which depends on a mass flow rate of air (hereinafter noted indifferently q (t) or Qmair) circulating in the intake distributor 4, - a unit of control 5 arranged and / or programmed to control an injection, by a fuel injector 7, of fuel into the intake manifold 4 and / or into the engine 6.
- a mass flow rate of air hereinafter noted indifferently q (t) or Qmair
- air inlet 19 in the distributor 4 is located upstream of the sensor 3.
- air generally means any oxidizer in gaseous form, preferably comprising dioxygen.
- Motor 6 is not part of device 2, but is part of the system
- Engine 6 is a thermal engine for automobiles, motorcycles, recreational vehicles, agricultural machinery, tractors, mowers, motor pumps, chainsaws, garden or DIY tools, generator sets, auxiliary engines (on trolleybus, concrete mixer, crane, etc.) etc. the invention relates to all applications of heat engines, typically gasoline or diesel. - y -
- the device 2 can comprise the fuel injector 7 or be just arranged to be connected to the injector 7 forming part of the system 1.
- the device 2 can include the intake distributor 4 or be just arranged to be connected to the distributor 4 forming part of the system 1.
- the sensor 3 ie the flowmeter or the pressure (preferably differential) or speed sensor
- the intake manifold 4 is positioned in the intake manifold 4.
- Each of the means of the device 2 and of the system 1 according to the invention are technical means.
- Unit 5 comprises at least one computer, a central or computing unit, an analog electronic circuit (preferably dedicated), a digital electronic circuit (preferably dedicated), and / or a microprocessor (preferably dedicated), and / or a microprocessor (preferably dedicated), and / or software means.
- the control unit 5 is arranged and / or programmed to receive and analyze the measurement coming from the sensor 3 (more precisely from the flowmeter, or from the pressure sensor (preferably differential) or from the speed sensor), and, depending on the measurement, calculating "in real time” a command 17 (step 32 of FIG. 5) arranged to control the injection into the engine 6 by the injector 7 of a specific quantity of fuel which depends on the measurement.
- control unit 5 is arranged and / or programmed to receive and analyze the measurement coming from the sensor 3 (from the flowmeter or from the sensor pressure (preferably differential) or speed), and, depending on the measurement, calculate the command 17 arranged to control the injection by the injector:
- Command 17 includes the activation time Ti.
- Unit 5 is designed and / or programmed to calculate the duration of activation Ti.
- Command 17 includes the injection start time.
- Unit 5 is arranged and / or programmed to calculate the instant of start of injection.
- the control unit 5 is arranged and / or programmed to calculate (step 27 of FIG. 5) the mass flow rate of air circulating in the intake manifold 4 as a function of the measurement coming from the sensor 3 (more precisely from the flowmeter , or the pressure sensor (preferably differential pressure) or the speed sensor).
- the control unit 5 is arranged and / or programmed to calculate, as a function of the measurement from the sensor 3, an engine speed (typically in the form of the mass air flow Qmair as a function of time as illustrated in figures 3 and 4).
- the measurement from sensor 3 (from the flowmeter or from the pressure (preferably differential) or speed sensor) is arranged to take into account or depend on the direction of air circulation in the intake manifold 4, as illustrated in the diagrams.
- Figures 3 and 4 which illustrate positive (air flow from distributor 4 to motor 6) and negative (air flow from distributor 4 to inlet 19) values of the flow rate.
- the device 2 comprises a temperature sensor 10 arranged to measure an engine temperature, the control unit 5 taking this engine temperature into account for at least one or each of its calculations, more exactly at least for the calculation of the command. 17, more exactly at least for the calculation of the duration Ti.
- the engine temperature measurement (step 29 in FIG. 5) can be done by direct measurement with a sensor screwed onto the housing (option possible).
- the calculation of the injection duration Ti (step 30 of FIG. 5) is carried out according to the formula:
- F target richness of the mixture, which is unitless, preferably equal to 1, and which is:
- F is typically measured by a richness probe or a gas analyzer on the exhaust manifold of the engine 6.
- the means 5 are therefore arranged to store a default value of F or preferably arranged to receive information relating to the value. of F (typically from the richness sensor or the gas analyzer)
- Qstat static mass flow rate of the injector 7.
- the means 5 are arranged to store a value of Qstat.
- a correction factor linked to engine temperature, typically equal to 1 if no correction is made.
- starter the injection time Ti can be multiplied by a factor of between 10 and 100 with respect to a phase of normal use.
- the value of a as a function of the engine temperature can be calibrated as a function of engine 6 and therefore stored in unit 5.
- the unit 5 is arranged to determine Nmotor the speed of rotation of the engine 6 or DT the period of rotation of the engine, and to take Nmotor or DT into account in the calculation of Ti.
- the sensor 3 (more precisely the flowmeter, or the pressure sensor (preferably differential) or the speed sensor) is arranged and / or programmed to provide its measurement "in real time", ie to repeat its measurement at a frequency d 'at least 2Hz, preferably at least 20Hz, more preferably at least 100Hz.
- the control unit 5 is arranged and / or programmed to calculate the command 17 “in real time” ie to repeat at least one or each calculation (at least of the command 17) at a frequency of at least 2 Hz, preferably at least 20Hz, more preferably at least 100Hz.
- the injection start instant calculated by unit 5 corresponds to a time when a maximum mass flow rate Qmair occurs in distributor 4 plus or minus a percentage (typically, less than or equal to 30%, preferably less than or equal to 15%, preferably equal to 0%; this percentage is to be optimized with routine tests after tests according to the measurement of the pollutants emitted by the engine 6) of a period DT of the engine cycle.
- a percentage typically, less than or equal to 30%, preferably less than or equal to 15%, preferably equal to 0%; this percentage is to be optimized with routine tests after tests according to the measurement of the pollutants emitted by the engine 6) of a period DT of the engine cycle.
- This injection start time is determined as follows.
- FIG. 3 shows a method for determining the engine speed.
- the unit 5 measures the time DT between two crossings of a high threshold 21 of the flow rate Qmair by rising on the condition of having previously passed through a low threshold 20 (first crossing of the high threshold 21 after crossing of the low threshold 20).
- This duration DT corresponds to the time period of the engine speed, and can change over time.
- FIG. 4 shows the method of determining the instant of start of injection.
- DT represents the period of the engine cycle determined according to the method indicated with reference to FIG. 3.
- the instant 24 of the start of injection of an engine cycle of the engine 6 is obtained as a function:
- the sensor 3 comprises in a first variant (step 11 of FIG. 5, and variant used in the case of the experimental results of FIGS. 3 and 4) illustrated in FIG. 2, a pressure sensor 33 differential Ap (t) as a function of time t.
- the sensor 3 is preferably a sensor as described in application WO 2005/080924 and / or WO 2009/118290, or other.
- the sensor 3 is typically arranged to measure a differential pressure Ap (t) over a range of at least ⁇ 2500 Pa with a maximum error of 0.25% of full scale.
- the device 2 comprises means 15 (typically a diaphragm or a grid) arranged to form a local pressure drop in the intake manifold 4, and the sensor 3 (ie the flowmeter or the differential pressure sensor 33) is arranged to take its measurement at the level of this local pressure drop, that is to say to measure the pressure difference between the upstream and downstream of the means 15 along the air flow from the inlet 19 to the injector 7.
- the means 15 comprise as a pressure reducing device a stainless steel grid with a pitch of 2mm, and 0.3mm d wire thickness.
- Device 2 includes:
- the measurement of the air temperature and the static pressure (step 28 of FIG. 5) is used to calculate the density of the air in the distributor. Knowing this density is used to switch from volume flow to mass flow. This quantity changes slowly, its measurement frequency may be of the order of a few hertz.
- Unit 5 is arranged and / or programmed to calculate the mass flow rate q m (t) by solving a differential equation which depends on the differential pressure Ap (t) measured.
- unit 5 is arranged and / or programmed: - to calculate (on the principle of application WO 2005/080924 and / or WO 2009/118290) the volume flow q (t) by solving a differential equation which depends on the differential pressure Ap (t) measured (step 25 of figure 5):
- q (t) represents the calculated volume flow dq (t) / dt represents the derivative with respect to time of q (t)
- Device 2 then comprises:
- an air temperature sensor 8 (typically comprising a thermocouple or a thermistor) arranged to be positioned in or in communication with the intake distributor, the control unit taking this air temperature into account for at least one or each of its calculations as for the previous variant, and / or
- a static pressure sensor 9 (typically comprising a relative static pressure sensor HMAM 100 B ⁇ 10,000 Pa) arranged to be positioned in or in communication with the intake distributor 4, the control unit 5 taking this static pressure into account for at least one or each of its calculations as for the previous variant.
- the measurement of air temperature and static pressure (step 28 in Figure 5) is used to calculate the density of the air. Knowing this density is used to switch from volume flow to mass flow. This quantity changes slowly, its measurement frequency may be of the order of a few hertz.
- Unit 5 is fitted and / or programmed:
- the sensor 3 comprises in a third variant (step 13 of FIG. 5), a speed sensor measuring the flow rate of the air in the distributor 4 (which is an average V of the air speed in a section of the distributor 4), for example of the anemometer or hot film type.
- Device 2 then comprises:
- an air temperature sensor 8 (typically comprising a thermocouple or a thermistor) arranged to be positioned in or in communication with the intake manifold 4, the control unit 5 taking this air temperature into account for at least one or each of its calculations as for the previous variant, and / or
- a static pressure sensor 9 (typically comprising a relative static pressure sensor HMAM 100 B ⁇ 10,000 Pa) arranged to be positioned in or in communication with the inlet distributor 4, the control unit 5 taking this pressure into account static for at least one or each of its calculations as for the previous variant.
- the measurement of air temperature and static pressure (step 28 in Figure 5) is used to calculate the density of the air. Knowing this density is used to switch from volume flow to mass flow. This quantity changes slowly, its measurement frequency may be of the order of a few hertz.
- Unit 5 is fitted and / or programmed:
- each calculation by the control unit 5, in particular the calculation of the command 17, does not include the use of an engine map or of a control table. correspondence.
- each calculation by the control unit 5, in particular the calculation of the command 17, comprises a resolution of at least one equation (more exactly of a differential equation in the first variant described above or at least of an algebraic equation for the other variants) by software and / or electronic calculation means.
- the invention optimizes the ratio of the oxidizer / fuel mixture by taking into account the cyclic disparities of the engine 6, the machining tolerances, the aging of the engine, the dispersions between the different cylinders of the same engine, the environment (weather conditions, altitude, etc.), etc.
- the device 2 makes it possible to control the fuel injection by relying on the physics of combustion and not on the kinematics of the engine 6, by means 3 for measuring instantaneous mass flow "in real time” and a calculation code. integrated in the unit 5.
- the device 2 takes into account the quantity of air actually admitted into the engine 6 to control the fuel injection.
- the mass of air entering by the distributor 4 is measured in real time which makes it possible to control the exact mass of fuel to be injected into each cylinder at each cycle.
- the flowmeter or sensor 3 sends to the unit 5 the signal 16 representative of the instantaneous mass flow rate of air entering the engine 6. From this information, the unit 5 determines the quantity of fuel to be injected by the injector 7 to achieve a target mix richness. The unit 5 then controls by the signal 17 the instant of start of injection as well as the duration of activation of the injector 7. The phasing of this injection is controlled thanks to the real-time knowledge of the flow rate of the injection. air Qmair and not by an initial mechanical calibration as proposed in the state of the art.
- this phasing parameter ie the fuel injection start time for each cycle
- the cyclic dispersions thanks to this strategy, are also appreciably attenuated which leads to a appreciably more regular and silent operation. It is a sustainable sequential injection.
- Device 2 makes it possible to save on any other additional sensor.
- Device 2 can be quickly implanted, without any additional sensor (sensor 10 being optional).
- System 1 includes:
- an intake distributor 4 which may be that of this device 2 or which may form part of the system 1 independently of this device 2, and which is arranged to route the air into the engine 6 (more exactly in this cylinder or group of cylinders of said engine 6),
- a fuel injector 7 which may be that of this device 2 or which may form part of the system 1 independently of this device 2, and which is arranged to inject fuel into said engine 6 (more exactly into this cylinder or group of cylinders of said engine 6) or in the intake manifold 4.
- a load butterfly valve 18 is arranged in the distributor 4 between the sensor 3 and the injector 7.
- FIG. 5 illustrates different steps of the first embodiment of the method according to the invention implemented by the system 1.
- the first variant of the first embodiment of the method according to the invention is implemented by the system 1 comprising the first variant of device 2 according to the invention.
- the second variant of the first embodiment of the method according to the invention is implemented by the system 1 comprising the second variant of the device 2 according to the invention.
- the third variant of the first embodiment of the method according to the invention is implemented by the system 1 comprising the third variant of the device 2 according to the invention.
- the fourth variant of the first embodiment of the method according to the invention is implemented by the system 1 comprising the fourth variant of the device 2 according to the invention.
- the first embodiment of the method according to the invention comprises a supply (step 11, 12, 13 or 14 of FIG. 5), by the sensor 3 (flowmeter or a pressure or speed sensor) positioned in or in communication with the intake distributor 4, of a measurement which depends on the mass flow rate of air Qmair circulating in the intake distributor 4, the intake distributor 4 conveying the air into the engine 6.
- the sensor 3 flowmeter or a pressure or speed sensor
- the measurement from sensor 3 (i.e. from the flowmeter or from the pressure or speed sensor) takes into account the direction of air circulation in the intake manifold 4.
- the measurement comprises a measurement of the differential pressure Ap (t) by the sensor 33
- the sensor 3 is positioned in the distributor intake 4
- the method comprises forming a local pressure drop in the intake manifold 4 by means 15, and the sensor 33 measures the differential pressure Ap (t) at this local drop in pressure.
- the measurement comprises a measurement of the volume flow q (t) by the sensor 3 which comprises the volume flow meter,
- the measurement comprises a measurement of the speed V of the air in the distributor 4 by the sensor 3 which comprises the speed sensor,
- the senor 3 repeats its measurement at a frequency of at least 2 Hz, preferably at least 20 Hz, more preferably at least 100 Hz .
- control unit 5 receives and analyzes the measurement from sensor 3 (flowmeter, or from the pressure sensor or from the speed sensor), and, depending on the measurement, calculates (steps 25, 26, 34, 27 , 30, 31) command 17.
- the control unit repeats the calculation of command 17 at a frequency of at least 2Hz, preferably at least 20Hz, more preferably at least 100Hz.
- step 25 and 26 of FIG. 5 we have: a supply of an air temperature in the distributor by the air temperature sensor 8 positioned in or in communication with the intake distributor 4, the control unit 5 taking into account this temperature of the 'air at least for the calculation of the command 17, o a supply of a static pressure of the air in the distributor by the static pressure sensor 9 positioned in or in communication with the intake distributor 4, the unit control 5 taking into account this static pressure at least for the calculation of the command 17, o the unit 5 which calculates as explained previously in the description of the device 2: q (t) by solving the differential equation previously described
- ⁇ qm (t) as a function of p (T) and q (t) in the third variant (step 34 of FIG. 5), we have: a supply of an air temperature in the distributor by the air temperature sensor 8 positioned in or in communication with the intake distributor 4, the control unit 5 taking into account this temperature of the 'air at least for the calculation of the command 17, o a supply of a static pressure of the air in the distributor by the static pressure sensor 9 positioned in or in communication with the intake distributor 4, the unit control 5 taking into account this static pressure at least for the calculation of the command 17, o the unit 5 which calculates as explained previously in the description of the device 2:
- the sensor 3 directly measures qm (t).
- the control unit 5 repeats the calculation of this mass flow rate q m (t) at a frequency of at least 2 Hz, preferably at least 20 Hz, more preferably at least 100 Hz.
- the first embodiment of the method according to the invention comprises a supply (step 29 of FIG. 5), by the temperature sensor 10, of the engine temperature, the control unit 5 taking at least take this engine temperature into account when calculating command 17.
- control unit 5 receives and analyzes the measurement coming from the sensor 3 (ie from the flowmeter or from the pressure or speed sensor), and, depending on the measurement, calculates the command 17 so as to control the injection. by injector 7:
- step 30 of FIG. 5 which depends on the measurement, according to the equation for Ti already described in the description of the device 2, and
- the injection start instant is calculated by the control unit 5 so as to correspond to a time when a maximum air flow Qmair occurs in the distributor 4 plus or minus a percentage, less than or equal to 30%, preferably less than or equal to 15%, of a period of the engine cycle.
- the calculation of the command 17 by the control unit 5 does not include the use of an engine map or of a correspondence table.
- the calculation of the command 17 by the control unit 5 comprises a resolution of at least one equation by software and / or electronic calculation means 5.
- the unit 5 sends the command 17 to the injector 7 (step 32 of FIG. 5) and thus controls the injection, by the injector 7 of fuel, of a quantity of fuel into the engine 6 which depends on the measure.
- the control for example for controlling the injector and / or for controlling the injection by the injector (start time of injection and / or duration of injection). activation of the injector), is arranged so as not to take into account a position of a state of a crankshaft mechanically connected to the movement of at least one piston or of another moving part in the engine.
- the position of a crankshaft condition may include an angle and / or an angular position of the crankshaft and / or a rotation of said crankshaft.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2001233A FR3107090B1 (fr) | 2020-02-07 | 2020-02-07 | Dispositif d’injection de carburant, moteur et procédé associé. |
| PCT/EP2021/052791 WO2021156434A1 (fr) | 2020-02-07 | 2021-02-05 | Dispositif d'injection de carburant, moteur et procede associe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4100636A1 true EP4100636A1 (fr) | 2022-12-14 |
Family
ID=69903692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21704730.7A Pending EP4100636A1 (fr) | 2020-02-07 | 2021-02-05 | Dispositif d'injection de carburant, moteur et procede associe |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4100636A1 (fr) |
| FR (1) | FR3107090B1 (fr) |
| WO (1) | WO2021156434A1 (fr) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1119493A (fr) * | 1978-07-21 | 1982-03-09 | Mamoru Fujieda | Systeme d'injection de carburant pour moteurs a combustion interne |
| JPS56129730A (en) * | 1980-03-18 | 1981-10-12 | Nissan Motor Co Ltd | Fuel injection controlling system for internal combustion engine |
| FR2866424B1 (fr) | 2004-02-16 | 2006-12-08 | Univ Poitiers | Debitmetre instationnaire |
| FR2929399B1 (fr) | 2008-03-28 | 2010-04-30 | Centre Nat Rech Scient | Debimetre instationnaire temps reel |
| FR2944059B1 (fr) * | 2009-04-02 | 2017-06-23 | Renault Sas | Procede et systeme de correction d'une mesure de debit d'air admis dans un moteur a combustion interne |
| JP5968771B2 (ja) * | 2012-12-07 | 2016-08-10 | 日立オートモティブシステムズ株式会社 | 内燃機関の燃料噴射制御装置 |
| JP7067003B2 (ja) * | 2017-09-25 | 2022-05-16 | 三菱自動車工業株式会社 | エンジンの制御装置 |
-
2020
- 2020-02-07 FR FR2001233A patent/FR3107090B1/fr active Active
-
2021
- 2021-02-05 WO PCT/EP2021/052791 patent/WO2021156434A1/fr not_active Ceased
- 2021-02-05 EP EP21704730.7A patent/EP4100636A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021156434A1 (fr) | 2021-08-12 |
| FR3107090A1 (fr) | 2021-08-13 |
| FR3107090B1 (fr) | 2023-11-03 |
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