EP1106813B1 - Procédé de détermination du débit massique d'un mélange gazeux - Google Patents

Procédé de détermination du débit massique d'un mélange gazeux Download PDF

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Publication number
EP1106813B1
EP1106813B1 EP00124703A EP00124703A EP1106813B1 EP 1106813 B1 EP1106813 B1 EP 1106813B1 EP 00124703 A EP00124703 A EP 00124703A EP 00124703 A EP00124703 A EP 00124703A EP 1106813 B1 EP1106813 B1 EP 1106813B1
Authority
EP
European Patent Office
Prior art keywords
mass flow
tank ventilation
max
intake manifold
depending
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.)
Expired - Lifetime
Application number
EP00124703A
Other languages
German (de)
English (en)
Other versions
EP1106813A3 (fr
EP1106813A2 (fr
Inventor
Michael Etzel
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP1106813A2 publication Critical patent/EP1106813A2/fr
Publication of EP1106813A3 publication Critical patent/EP1106813A3/fr
Application granted granted Critical
Publication of EP1106813B1 publication Critical patent/EP1106813B1/fr
Anticipated expiration legal-status Critical
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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
    • 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
    • F02D41/0025—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

Definitions

  • the invention relates to a method for determining the Mass flow of a gas mixture according to the generic term of Claim 1. Such a method is known from the Publication US 5 216 995 known.
  • an internal combustion engine is included Tank ventilation system and a method for controlling the Tank vent valve known.
  • the control signal of a Tank vent valve is preferably a pulse width modulated signal, its duty cycle and its period or control frequency depending on the operating parameters of the internal combustion engine, such as. B. the Speed, are variably specifiable.
  • Evaporated fuel in the tank must not be burned to the environment be delivered. Therefore, the gas mixture of air and evaporated Fuel usually from an activated carbon store through the electronic controllable tank ventilation valve into the intake manifold and further into the Combustion chamber of the internal combustion engine out. Despite this additional Gas mixture supply from the tank ventilation system should not be possible Deviation from the current load and speed-dependent optimal target fuel-air mixture for the combustion process in the cylinders occur. Therefore, a precise knowledge of the mass flow from the Tank ventilation system required.
  • a stored in the control unit is complete open tank ventilation valve maximum mass flow depending on current intake manifold vacuum specified.
  • the current one Mass flow is determined by an algorithm in the control unit, at one of the coulters depending on the activation time of the tank ventilation valve of straight lines with the control frequency of the control signal and with the maximum mass flow is multiplied.
  • the straight lines are through from Slope factors dependent on the intake manifold vacuum and by the Suction pipe vacuum dependent offset values defined.
  • the family of straight lines is replaced by a Straight line equation
  • the set of straight lines specified by a map.
  • the maximum mass flow m ⁇ max through the tank ventilation system is empirically determined at a duty cycle of 100% and stored in the control unit.
  • the current to be determined mass flow m ⁇ is related to this maximum mass flow m ⁇ max.
  • a standardized mass pulse value m ⁇ ist / m ⁇ max 1 / f is generated that is independent of the drive frequency of the drive signal.
  • this mass pulse value m ⁇ ist / m ⁇ max 1 / f is plotted over the activation time T of the tank ventilation valve by a family of straight lines (A, B) which is dependent on the intake manifold vacuum dps.
  • A, B the two straight lines A (for a suction pipe negative pressure value dps2) and B (for a suction pipe negative pressure value dps1) are shown only as an example, dps1 being smaller than dps2.
  • a large number of straight lines can be specified.
  • the respective offset value b (b A , b B ) and the respective gradient factor a (a A , a B ) of the straight line (A, B) depend on the intake manifold vacuum dps (dps1, dps2) as parameters.
  • the influence of the intake manifold vacuum on the time behavior of the gas column in the tank ventilation system is taken into account.
  • Intake manifold vacuum dps either the sole intake manifold vacuum or also the differential pressure between the intake manifold vacuum and the Ambient pressure is to be understood, which is preferably by means of a Pressure sensor is measured on the intake manifold.
  • the intake manifold vacuum or the differential pressure dps is the input signal of a mass flow characteristic 1, an offset characteristic 2 and a gradient characteristic 3.
  • the characteristics 1, 2, 3 are determined empirically and stored in the control unit.
  • the mass flow characteristic 1 specifies the maximum mass flows m ⁇ max when the tank ventilation valve is fully open, depending on the current intake manifold vacuum dps.
  • the offset characteristic b specifies the offset values b (b A , b B ) depending on the intake manifold vacuum dps and the gradient characteristic 3 specifies the gradient factors a (a A , a B ) dependent on the intake manifold vacuum dps.
  • the duty cycle V and the period 1 / f of the pulse-width-modulated control signal are input signals of a conversion unit 4.
  • the control time T of the tank ventilation valve is determined from the duty cycle V and the period 1 / f.
  • the respectively given gradient factor a is multiplied at a first multiplication point by this actuation period T of the tank ventilation valve.
  • This product is then added to the respective offset value b at a summing point.
  • the output signal of the summing point is divided by the period 1 / f at a quotient formation point.
  • the output signal of the quotient formation point is finally multiplied by the maximum mass flow m ⁇ max at a second multiplication point.
  • the result is an accurate determination of the required mass flow m ⁇ .
  • the accuracy of the method can be optimized by a large number of support points in the characteristic curves.
  • the offset characteristic curve 2, the slope characteristic curve 3, the summing point and the first multiplication point are summarized in FIG. 2 as arithmetic unit 5.
  • Computing unit 5 also a map representing the family of straight lines be used.
  • the method according to the invention is invertible, so that the algorithm can also be used to control the mass flow.

Landscapes

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

Claims (3)

  1. Procédé de détermination du débit massique d'un mélange gazeux, qui est conduit d'une installation de purge du réservoir à la chambre de combustion d'un moteur à combustion interne, au moyen d'un appareil de commande électronique en fonction de la dépression instantanée dans la tubulure d'admission et en fonction du signal de commande de la soupape de purge du réservoir,
    caractérisé en ce qu'
    un débit massique maximal (m ˙ max) pour la soupape de purge du réservoir entièrement ouverte et mémorisé dans l'appareil de commande est prédéterminé en fonction de la dépression instantanée (dps) dans la tubulure d'admission, et le débit massique instantané (m ˙ ist) est déterminé par un algorithme dans l'appareil de commande, dans lequel un faisceau de droites dépendant du temps de commande (T) de la soupape de purge du réservoir, qui sont définies par des coefficients de pente (a) dépendant de la dépression dans la tubulure d'admission (dps) et par des valeurs de décalage (b) dépendant de la dépression dans la tubulure d'admission (dps), est multiplié par la fréquence de commande (f) du signal de commande et par le débit massique maximal (m ˙ max).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le faisceau de droites est prédéterminé par l'équation des droites (a x T + b), dans laquelle
    a est le coefficient de pente d'une droite
    b est la valeur de décalage d'une droite, et
    T est le temps de commande du signal de commande,
    et le coefficient de pente (a) ainsi que la valeur de décalage (b) sont chaque fois prédéterminés par une courbe caractéristique (2, 3) dépendant de la dépression dans la tubulure d'admission.
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    le faisceau de droites est prédéterminé par un diagramme caractéristique.
EP00124703A 1999-12-10 2000-11-11 Procédé de détermination du débit massique d'un mélange gazeux Expired - Lifetime EP1106813B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19959660 1999-12-10
DE19959660A DE19959660C1 (de) 1999-12-10 1999-12-10 Verfahren zur Bestimmung des Massenstroms eines Gasgemisches

Publications (3)

Publication Number Publication Date
EP1106813A2 EP1106813A2 (fr) 2001-06-13
EP1106813A3 EP1106813A3 (fr) 2003-05-14
EP1106813B1 true EP1106813B1 (fr) 2004-03-24

Family

ID=7932195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00124703A Expired - Lifetime EP1106813B1 (fr) 1999-12-10 2000-11-11 Procédé de détermination du débit massique d'un mélange gazeux

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EP (1) EP1106813B1 (fr)
DE (2) DE19959660C1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10331581A1 (de) 2003-07-11 2005-01-27 Robert Bosch Gmbh Vorrichtung und Verfahren zur Bestimmung des Massenstromes über das Tankentlüftungsventil für eine Verbrennungskraftmaschine
DE10335902B4 (de) * 2003-08-06 2015-12-31 Robert Bosch Gmbh Verfahren zur Tankentlüftung bei einer Brennkraftmaschine
DE102005018272B4 (de) * 2005-04-20 2019-10-31 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betreiben einer Brennkraftmaschine
DE102017209127A1 (de) * 2017-05-31 2018-12-06 Robert Bosch Gmbh Verfahren zum Berechnen eines Massenstroms von einem Tankentlüftungssystem in ein Saugrohr eines Verbrennungsmotors
DE102018112487A1 (de) * 2018-05-24 2019-11-28 Volkswagen Aktiengesellschaft Verfahren zum Betreiben eines Antriebssystems eines Kraftfahrzeugs, Antriebssystem und Kraftfahrzeug

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3813220C2 (de) * 1988-04-20 1997-03-20 Bosch Gmbh Robert Verfahren und Einrichtung zum Stellen eines Tankentlüftungsventiles
JPH0533733A (ja) * 1991-05-20 1993-02-09 Honda Motor Co Ltd 内燃エンジンの蒸発燃料制御装置
DE4319772A1 (de) * 1993-06-15 1994-12-22 Bosch Gmbh Robert Verfahren und Vorrichtung zum Steuern einer Tankentlüftungsanlage
JP3154324B2 (ja) * 1996-05-15 2001-04-09 トヨタ自動車株式会社 内燃機関の蒸発燃料処理装置
DE19701353C1 (de) * 1997-01-16 1998-03-12 Siemens Ag Verfahren zur Tankentlüftung bei einer Brennkraftmaschine
DE19740917B4 (de) * 1997-04-01 2008-11-27 Robert Bosch Gmbh Verfahren und Vorrichtung zur Bestimmung der Gastemperatur in einem Verbrennungsmotor
DE19756919A1 (de) * 1997-04-01 1998-10-08 Bosch Gmbh Robert Verfahren und Vorrichtung zur Bestimmung einer Gasfüllung eines Verbrennungsmotors

Also Published As

Publication number Publication date
DE50005783D1 (de) 2004-04-29
DE19959660C1 (de) 2001-07-05
EP1106813A3 (fr) 2003-05-14
EP1106813A2 (fr) 2001-06-13

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