EP3575581B1 - Procédé de commande d'une soupape de régulation - Google Patents

Procédé de commande d'une soupape de régulation Download PDF

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Publication number
EP3575581B1
EP3575581B1 EP19176067.7A EP19176067A EP3575581B1 EP 3575581 B1 EP3575581 B1 EP 3575581B1 EP 19176067 A EP19176067 A EP 19176067A EP 3575581 B1 EP3575581 B1 EP 3575581B1
Authority
EP
European Patent Office
Prior art keywords
control valve
fuel
fluid
density
internal combustion
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.)
Active
Application number
EP19176067.7A
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German (de)
English (en)
Other versions
EP3575581A1 (fr
Inventor
Michael Brand
Silke Weddig
Björn Fröhlich
Jens Wodausch
Christian Arenz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volkswagen AG
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Volkswagen AG
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Filing date
Publication date
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Publication of EP3575581A1 publication Critical patent/EP3575581A1/fr
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Publication of EP3575581B1 publication Critical patent/EP3575581B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
    • F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
    • F02D41/004—Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
    • F02D41/0042—Controlling the combustible mixture as a function of the canister purging, e.g. control of injected fuel to compensate for deviation of air fuel ratio when purging
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
    • F02D41/0045—Estimating, calculating or determining the purging rate, amount, flow or concentration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/089—Layout of the fuel vapour installation
    • 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
    • F02D2200/0602—Fuel 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
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0606—Fuel temperature

Definitions

  • the invention relates to a method for controlling a control valve, in particular a control valve of a tank ventilation system, preferably the tank ventilation system of a motor vehicle.
  • Control valves in tank ventilation systems regulate a volume flow from a filter (an adsorbent) of a tank to an intake pipe (or a connection between the filter and at least one combustion chamber) of an internal combustion engine.
  • the filter is usually an activated charcoal filter that binds the components of the fluid stored in the tank (e.g. a fuel) that are outgassed from the tank.
  • the activated carbon filter can be fluidically connected to the intake manifold of the internal combustion engine via the control valve, so that the fluid bound or temporarily stored in the filter can be supplied to the combustion chamber in a controlled manner.
  • the determination of the amount supplied via the tank ventilation system is currently z. B. allows via lambda sensors. To do this, the control valve of the tank ventilation system is slowly opened and the deviation from a target value for lambda (fuel-air ratio; determined by exhaust gas sensors) is monitored. It is assumed that this deviation results exclusively from the supply of fuel from the tank ventilation system. For this, however, a signal is evaluated downstream of the combustion chamber, ie a deviation from the setpoint value for lambda must first occur before regulation can take place. This results in an increase in raw emissions. Furthermore, all mixture deviations are traced back to the fuel supplied from the tank ventilation system.
  • lambda fuel-air ratio
  • the calculated fuel proportion does not correspond to the actual fuel proportion.
  • the tank ventilation has to be controlled very carefully or strictly limited so as not to have too great an impact on the smoothness and raw emissions of the internal combustion engine.
  • the DE 10 2015 117 050 A1 is directed to a method of operating a tank ventilation system.
  • the fuel is specifically sucked out of a filter by means of a pump and fed to the internal combustion engine.
  • the US 2007/0251509 A1 is directed to a control unit for determining a ratio of a fuel-air mixture.
  • the EP 0533 405 A1 is directed to a system for regulating a volume flow from a fuel to an internal combustion engine.
  • the control valve regulates a volume flow along a connection between the filter and the internal combustion engine. If necessary, the connecting section is connected to the suction pipe via an introduction point.
  • Steps a) to c) are carried out in the order described.
  • steps a) and b) are carried out at least temporarily in parallel with one another.
  • Step c) takes place taking into account the pressure curve, that is, after step b).
  • step b At least one minimum and one maximum of the pressure profile are recorded in step b).
  • a minimum of the pressure profile is recorded which is present in the pressure profile immediately before the control valve closes.
  • a maximum of the pressure profile is recorded which is present in the pressure profile immediately after the control valve is closed.
  • Closing the control valve includes in particular that in the closed state of the control valve no volume flow can flow through the control valve.
  • the pressure curve is measured in particular by means of continuous or intermittent sensor-based recording of a pressure state. Concrete sensor readings can be cumulated. Individual values of the pressure measurement can be averaged and / or saved.
  • the pressure curve can be characterized or analyzed using the following pressure parameters: maximum values, minimum values, deviations from measured or specifiable measured or threshold values, rate of change.
  • the determination of the density of the fluid can take place arithmetically on the basis of measured pressure states or pressure parameters derived therefrom, possibly with the inclusion of one of the aforementioned pressure parameters.
  • the determination of the density of the fluid can in particular be determined by evaluating (at least) the minimum and maximum of the pressure curve.
  • the volume flow of the fluid flowing through the at least partially open control valve can be determined (for example detected by measurement using a hot film sensor or the like).
  • the volume flow can be determined immediately before initiating the closing process according to step a).
  • the volume flow can be determined in the process of opening the control valve following the closing process in accordance with step a). The volume flow is recorded in particular by measurement.
  • At least a first portion of a first component of the fluid and a second portion of a second component of the fluid can be determined.
  • the first component is air and the second component is a fuel.
  • the fuel is at least partially, in particular completely, in gaseous form. If necessary, the fuel can be in the form of a liquid.
  • a temperature of the fluid can be determined. Knowing the temperature, the density of the fluid (with a higher accuracy) certainly.
  • the temperature is measured together with the pressure, e.g. B. by a combined sensor (pressure / temperature sensor).
  • the control valve is clocked or opens and closes with at least one frequency.
  • a pulsed volume flow of the fluid can thus be provided via the control valve.
  • the method in particular at least steps a) to c), possibly additionally at least one of steps i) and ii) (or both) is carried out at least for two, three, four or more successive closing processes, in particular for each closing process.
  • the density determined in accordance with step c) can be verified by repeating the method. If necessary, the determined values for the density can be averaged.
  • the frequency is in particular between 5 and 50 Hertz, preferably between 5 and 20 Hertz.
  • the control valve is controlled in particular via a (PWM) signal (pulse width modulation), with the control valve opening, in particular successively, from a certain pulse duty factor.
  • PWM pulse width modulation
  • a volume flow flowing through the control valve can be controlled via the pulse duty factor.
  • a regulation of the addition of fuel to the internal combustion engine is carried out as a function of the specific density of the fluid.
  • the proportion of fuel in the fluid can be determined by determining the density, so that a more precise addition of a predeterminable amount of fuel is possible via the controlled opening of the regulating valve.
  • the pressure sensor is arranged between the filter and the control valve.
  • the control valve is designed in particular in such a way that a pulsed volume flow is guided via the control valve to the suction line.
  • the control valve is controlled via a PWM signal.
  • the fluid flows. If the control valve then closes, the volume flow of the fluid is suddenly interrupted. This leads to a measurable increase in pressure upstream of the control valve.
  • the course of the pressure increase or the pressure change depends in particular on the flow rate of the volume flow during the open phase and on the density of the fluid.
  • the density of the fluid can be determined with the pressure sensor or with additional determination of the temperature.
  • the proportions of air and fuel can be determined from the fundamentally known individual density values (density of the fuel used and the density of the air, possibly determined as a function of temperature) and the (total) density of the fluid.
  • the proportion of fuel or the proportion of fuel originating from the filter can be determined, this proportion being determined upstream of the combustion chamber. In this way, the addition of fuel to the internal combustion engine can be regulated before the fuel is burned.
  • the density can be determined at the stated frequency, so that sudden and / or surge-like changes in the composition of the fluid can also be determined and the fuel addition can be regulated taking these changes into account.
  • the accuracy of the determination of the fuel fraction in the fluid is independent of the quality of the mixture pilot control.
  • Rapid activation of the tank ventilation (or rapid opening of the control valve) is also possible, so that the amount of purging air can be increased.
  • the increase in the amount of scavenging air means that the fuel stored in the filter can be better removed from the filter.
  • a motor vehicle at least having an internal combustion engine with at least one combustion chamber, a tank for a fuel that can be converted in the internal combustion engine with a filter, an intake pipe through which at least air and the fuel can be supplied to the combustion chamber, a control valve that has a regulates at least the volume flow comprising fuel from the filter to the intake manifold (along the line, in particular the first line and the second line) or controls according to the underlying control circuit, as well as a pressure sensor for measuring a pressure profile upstream of the control valve.
  • the control valve can be activated by a control unit for opening and closing.
  • the control unit is set up or suitably designed to carry out the method already described. The control unit can therefore carry out the described method or carry it out while the motor vehicle is in operation.
  • the method can also be used in internal combustion engines that are not used in motor vehicles.
  • the method can also be used when proportions of the fluid are to be determined in general in gas-carrying lines.
  • the fluid does not have to be fed to an internal combustion engine.
  • the method can also be carried out by a computer or with a processor of a control unit.
  • a system for data processing which comprises a processor which is adapted / configured in such a way that it executes the method or part of the steps of the proposed method.
  • a computer-readable storage medium can be provided which comprises instructions which, when executed by a computer / processor, cause the latter to execute the method or at least some of the steps of the proposed method.
  • first primarily (only) serve to distinguish between several similar objects, sizes or processes, i.e. in particular no dependency and / or sequence of these objects, sizes or prescribe processes to each other. Should a dependency and / or sequence be required, this is explicitly stated here or it is obvious to the person skilled in the art when studying the specifically described embodiment.
  • Fig. 1 shows a motor vehicle 11.
  • the motor vehicle 11 comprises an internal combustion engine 7 with a plurality of combustion chambers 12, a tank 5 for a fuel 10 convertible in the internal combustion engine 7 with a filter 4, an intake pipe 6 through which at least air and the fuel 10 are directed Combustion chamber 12 can be fed, as well as a regulating valve 1 which regulates a volume flow 2 of the fluid 3 comprising at least the fuel 10 from the filter 4 via the lines 16, 17 to the intake manifold 4.
  • the regulating valve 1 can be activated by a control unit 14 for opening and closing.
  • the control unit 14 is set up or suitably designed to carry out the method.
  • the motor vehicle 11 further comprises a pressure sensor 13 directly upstream of the control valve 1, via which the pressure 18 or the pressure profile 9 upstream of the control valve 1 can be measured.
  • the fuel 10 is stored in a tank 5, fuel vapors being able to reach the filter 4 via the first line 16.
  • the fuel 10 temporarily stored in the filter 4 is transferred to the intake manifold 6 via the control valve 1 and via the second line 17.
  • Fig. 2 shows a variant embodiment of the method in a diagram.
  • Time 15 is plotted on the horizontal axis.
  • step a) a closing process 8 of the control valve 1 is carried out.
  • step b) the pressure profile 9 is measured upstream of the control valve 1.
  • step c) a density of the fluid 3 is determined.
  • the control valve 1 is clocked with a frequency and opens and closes in the frequency (here the frequency is 10 Hertz).
  • the method is carried out here with four successive closing operations 8.
  • the density of the fluid 3 can be determined with the pressure sensor 13 or with the additional determination of the temperature.
  • the proportions of air and fuel 10 can be determined from the fundamentally known individual density values (density of the fuel 10 used and the density of the air, possibly determined as a function of temperature) and the determined (total) density of the fluid 3.
  • the proportion of the fuel 10 or the proportion of the fuel 10 originating from the filter 4 can be determined, this proportion already being determined upstream of the combustion chamber 12. In this way, the addition of fuel to the internal combustion engine 7 can be regulated even before the fuel 10 is burned.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)

Claims (9)

  1. Procédé de pilotage d'une vanne de régulation (1), la vanne de régulation (1) régulant un débit volumique (2) d'un fluide (3) depuis un filtre (4) d'un réservoir (5) vers un tube d'aspiration (6) d'un moteur à combustion interne (7) le long d'une conduite (16, 17); le procédé comprenant au moins les étapes suivantes:
    a) réalisation d'une opération de fermeture (8) de la vanne de régulation (1);
    b) mesure d'une courbe de pression (9) en amont de la vanne de régulation (1);
    c) détermination d'une densité du fluide (3) en tenant compte de la courbe de pression (9);
    une régulation d'un apport en carburant du moteur à combustion interne (7) étant effectuée en fonction de la densité déterminée du fluide (3).
  2. Procédé selon la revendication 1, le débit volumique (2) du fluide (3) qui s'écoule à travers la vanne de régulation (1) partiellement ouverte étant identifié dans une étape i) supplémentaire.
  3. Procédé selon la revendication 2, au moins une première part d'une première composante du fluide (3) et une deuxième part d'une deuxième composante du fluide (3) étant identifiées en connaissant la densité et le débit volumique (2).
  4. Procédé selon la revendication 3, la première composante étant de l'air et la deuxième composante étant un carburant (10).
  5. Procédé selon l'une des revendications précédentes, une température du fluide (3) étant identifiée dans une étape ii) supplémentaire, la densité du fluide (3) étant déterminée en connaissant la température.
  6. Procédé selon l'une des revendications précédentes, la vanne de régulation (1) s'ouvrant et se fermant avec une fréquence pouvant être prédéfinie; au moins les étapes a) à c) étant exécutées pendant au moins deux opérations de fermeture (8) successives.
  7. Procédé selon la revendication 6, la fréquence étant comprise entre 5 et 50 Hertz.
  8. Véhicule automobile (11), possédant au moins un moteur à combustion interne (7) comprenant une chambre de combustion (12), un réservoir (5) pour un carburant (10) qui peut être transféré dans le moteur à combustion interne (7) pourvu d'un filtre (4), un tube d'aspiration (6) par le biais duquel au moins de l'air et le carburant (10) peuvent être acheminés jusqu'à la chambre de combustion (12), une vanne de régulation (1) qui régule un débit volumique (2) comprenant au moins le carburant (10) depuis le filtre (4) vers le tube d'aspiration (6) ainsi qu'un capteur de pression (13) destiné à mesurer une courbe de pression (9) en amont de la vanne de régulation (1); la vanne de régulation (1) étant pilotée par une unité de commande (14) pour s'ouvrir et se fermer; l'unité de commande (14) étant conçue pour mettre en œuvre un procédé selon l'une des revendications précédentes.
  9. Utilisation d'une densité du fluide comprenant de l'air et du carburant, déterminée selon l'une des revendications 1 à 7, pour la régulation d'un apport de quantité de carburant vers un moteur à combustion interne (7).
EP19176067.7A 2018-05-28 2019-05-23 Procédé de commande d'une soupape de régulation Active EP3575581B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018112731.6A DE102018112731A1 (de) 2018-05-28 2018-05-28 Verfahren zur Ansteuerung eines Regelventils

Publications (2)

Publication Number Publication Date
EP3575581A1 EP3575581A1 (fr) 2019-12-04
EP3575581B1 true EP3575581B1 (fr) 2021-07-07

Family

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Family Applications (1)

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EP19176067.7A Active EP3575581B1 (fr) 2018-05-28 2019-05-23 Procédé de commande d'une soupape de régulation

Country Status (4)

Country Link
US (1) US11261829B2 (fr)
EP (1) EP3575581B1 (fr)
CN (1) CN110541768B (fr)
DE (1) DE102018112731A1 (fr)

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DE102018112731A1 (de) 2019-11-28
CN110541768B (zh) 2022-08-30
CN110541768A (zh) 2019-12-06
US20190360435A1 (en) 2019-11-28
US11261829B2 (en) 2022-03-01

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