EP1415079A1 - Procede et appareil de commande pour diagnostics de fonctionnement d'une soupape de ventilation de reservoir d'installation de reservoir de carburant, notamment d'automobile - Google Patents

Procede et appareil de commande pour diagnostics de fonctionnement d'une soupape de ventilation de reservoir d'installation de reservoir de carburant, notamment d'automobile

Info

Publication number
EP1415079A1
EP1415079A1 EP02754259A EP02754259A EP1415079A1 EP 1415079 A1 EP1415079 A1 EP 1415079A1 EP 02754259 A EP02754259 A EP 02754259A EP 02754259 A EP02754259 A EP 02754259A EP 1415079 A1 EP1415079 A1 EP 1415079A1
Authority
EP
European Patent Office
Prior art keywords
ventilation valve
tank ventilation
operating variable
pressure source
tank
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
Application number
EP02754259A
Other languages
German (de)
English (en)
Other versions
EP1415079B1 (fr
Inventor
Martin Streib
Dieter Lederer
Karl-Bernhard Lederle
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1415079A1 publication Critical patent/EP1415079A1/fr
Application granted granted Critical
Publication of EP1415079B1 publication Critical patent/EP1415079B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F02M25/0809—Judging failure of purge control system
    • F02M25/0818—Judging failure of purge control system having means for pressurising the evaporative emission space

Definitions

  • the invention relates to a method for testing the functionality of a tank ventilation valve arranged in a fuel tank system, in particular a motor vehicle, and a control device for carrying out the method according to the preambles of the respective independent claims.
  • Modern internal combustion engines used in motor vehicles are known to have a fuel storage tank and a control device for monitoring and, if necessary, to prevent emission of fuel vapors formed in the fuel storage tank.
  • the control device is used in particular to capture any fuel vapor that may occur by means of an activated carbon trap or an activated carbon filter and to temporarily store it in the activated carbon trap.
  • Volatile fuel vapors which are mostly hydrocarbon vapors, are formed, for example, during a refueling process of the vehicle or due to a rising fuel temperature in the tank and the associated increase in fuel vapor pressure.
  • the activated carbon trap is connected via a tank ventilation valve (TEV) to an intake pipe serving to draw in combustion air via a throttle valve to the internal combustion engine. Opening the TEV creates a pressure drop between the activated carbon trap and the intake manifold, by means of which the hydrocarbon stored in the activated carbon trap is fed into the intake manifold in order to ultimately be burned in the internal combustion engine and thus disposed of.
  • TEV tank ventilation valve
  • a first known approach to diagnosing the TEV involves operating the TEV at idle at a sufficiently stable operating point and observing the change in the mixture composition supplied to the internal combustion engine and the change in the energy flow via the throttle valve.
  • the energy flow mentioned corresponds to the product of the air mass flow discharged via the throttle valve and the ignition angle efficiency. This method therefore requires a high intake manifold vacuum.
  • the diagnosis takes place as part of a normal leak test of the tank system.
  • a normal leak test of the tank system Such a method can be seen, for example, from the publications US 5,349,935, PE 106 36 431.0 Ali, DE 108 '09 304.5 AI and DE 196 25 702 A1J.
  • the tank system is pressurized by means of a pump and then evaluated of the pressure curve, if necessary, concluded that there is a leak.
  • ⁇ JP-'G "173'l3-9- / f-mid.
  • the present invention is therefore based on the object of developing a method and a control device of the type mentioned at the outset such that the highest possible level of diagnostic reliability is provided with the shortest possible diagnostic duration.
  • the object is achieved by the features of the independent claims.
  • Advantageous refinements of the method according to the invention and further developments of the control unit are the subject of the subclaims.
  • the invention proposes to control the tank ventilation valve to open or close, to carry out a specific pressure change, to record at least one operating variable of the pressure source and to conclude from the recorded operating variable that there is a functionally opening or closing tank ventilation valve.
  • the tank ventilation valve is actuated in a closing manner and a certain pressure build-up is generated in the tank ventilation system by means of the pressure source.
  • the at least one operating variable of the pressure source is recorded and, from the recorded operating variable, if necessary, a closed tank ventilation valve is closed.
  • the tank venting valve is then actuated opening and the at least one operating variable of the pressure source is recorded when the pressure is reduced.
  • the tank ventilation valve can be actuated in an opening manner and for the pressure in the tank ventilation system to be reduced, the at least one operating variable of the pressure source and a closed operable tank ventilation valve is deduced from the recorded operating variable, and that the tank ventilation valve is then actuated in closing, when the pressure builds up, the at least one operating variable of the pressure source is recorded and, if necessary, a closed tank ventilation valve is concluded from the recorded operating variable.
  • the tank ventilation valve is activated in a closing manner and the pressure source is initially activated briefly. An idle operating variable of the pressure source is recorded. Subsequently, the tank ventilation valve is actuated in an opening manner and, from the relative change in the at least one operating variable of the pressure source compared to the idling operating variable, the operational functionality of the tank ventilation valve may be inferred.
  • the proposed method can also be applied to systems with only a low intake manifold vacuum, for example WT systems.
  • the method does not require pumping upstream of the actual TEV diagnosis against a reference leak and subsequent pressure build-up until a reference current level is reached.
  • a significantly shortened TEV diagnosis time and at the same time a higher information Security provided.
  • a quantitative statement about the actual volume flow behavior of the TEV is also possible.
  • the invention can be used advantageously not only in motor vehicle technology, but in all areas in which tank systems are to be kept free of volatile substances in the manner mentioned at the beginning. For example, only the petrochemical sector is given here.
  • FIG. 1 shows a fuel tank system in which a method making use of the invention or a control unit according to the invention are used ?
  • FIG. 2 control signals provided in accordance with a first exemplary embodiment and measurement data resulting therefrom as a function of time;
  • FIG. 3 shows a diagram corresponding to FIG. 2 according to a second exemplary embodiment.
  • the fuel tank system shown in block diagram form in FIG. 1 comprises a tank 10 which is connected to an activated carbon filter 14 via a tank connection line 12.
  • An intake manifold 16 (not shown) of an internal combustion engine (not shown) has a throttle valve, is also connected to the tank 10 via the activated carbon filter 14, via an intake line 18 and via a tank ventilation valve (TEV) 20.
  • TAV tank ventilation valve
  • volatile hydrocarbon vapors are formed in the tank, which pass through the line 12 into the activated carbon filter 14 and are reversibly bound in a known manner.
  • a leak diagnosis unit 28 connected to the activated carbon filter 14 is provided.
  • the diagnostic unit 28 comprises a vane pump 30.
  • the switching valve 32 already mentioned is connected upstream of the pump 30.
  • a reference leak 36 is introduced into a separate line branch 34.
  • the reference leak 36 is opened or closed by means of a magnetic slide valve 38.
  • the respective dimensioning of the reference leak 36 is chosen such that it corresponds to the size of the leak to be detected. In the case of the US standard mentioned at the outset, the reference leak therefore has an opening cross section of 0.5 mm.
  • the changeover valve 32 has two switching positions. In the first position, the pump 30 is connected to the tank 10 in a pressure-conducting manner via the activated carbon filter 14 and thus pumps outside air into the tank 10. The current consumption of the pump 30 is continuously recorded while the fresh air is being pumped into the tank 10. To carry out a reference measurement, the changeover valve 32 is completely closed, so that the current consumption of the pump 30 can now be detected by means of the magnetic slide valve 38 due to the dynamic pressure building up in front of the reference leak 36. The control of the pump 30 by means of the control unit 21 and the reading out of the current consumption data takes place via corresponding control and data lines 44, 46.
  • Figures 2 and 3 show temporal profiles of the control voltage U_UmschV of the changeover valve 32, the control of the TEV 20, the pump current and the pump Current consumption I_Pumpe and the pressure in the tank system p_Tankanl., As they occur in two different configurations of the method according to the invention.
  • the TEV 20 is then activated 106 at t2, which, when the TEV 20 is actually opened, leads to a pressure drop 108 in the tank system and thus to a drop 110 in the current consumption of the pump 30. If the amount of this drop in a second threshold value I_Schw2, which is again to be determined empirically, is exceeded, a correctly opening TEV 20 is inferred.
  • the above-described cycle of pressure build-up 100 and pressure reduction 108 with closed 112 or open 106 controlled TEV 20 can be repeated several times to increase the quality of the functional diagnosis, as shown in the example. So there is a second pressure increase between t3 and t4 and subsequently a pressure drop between t4 and t5.
  • the TEV 20 can be controlled with different duty cycles to open, for example by detecting the time gradient of the current consumption I_Pumpe of the pump 30 the actual, by the TEV 20 flowing mass or To be able to calculate volume flow.
  • FIG. 3 shows a second exemplary embodiment in a representation similar to FIG. 2, in which, in contrast to FIG. 2, the TEV diagnosis is carried out using a negative pressure method.
  • the pump 30 is briefly activated and its current consumption I_Pumpe under idle 202 detected.
  • the TEV 20 is actuated opening 204, as a result of which a pressure reduction 206 occurs in the tank system due to the existing intake manifold vacuum when the TEV 20 is actually opened.
  • the functionality of the TEV 20 is inferred from the difference in the detected idle current 202.
  • the cycles are repeated several times and, as described above, different duty cycles may be used.
  • the above-described method steps for diagnosing the TEV 20 can be implemented by appropriate programming of the control unit 21, for example by inserting an appropriate program code into an EEPROM.

Landscapes

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

Abstract

L'invention concerne un procédé permettant de vérifier la fonctionnalité d'une soupape de ventilation de réservoir, montée dans une installation de réservoir, notamment d'automobile, pilotable au moyen d'une unité de commande (21) et reliée à une tubulure d'admission (16). Il est prévu une source de pression (30) pour vérifier l'étanchéité de l'installation de réservoir à l'aide de surpression ou de dépression. La fonctionnalité de la soupape de ventilation de réservoir s'effectue sur la base d'au moins une valeur de fonctionnement (102) de la source de pression. Afin de parvenir à des temps de diagnostic courts et à une fiabilité de diagnostic aussi grande que possible, il est prévu de piloter la soupape de ventilation de réservoir en ouverture ou en fermeture et d'effectuer une modulation déterminée de la pression (100, 108). Il est également prévu de détecter la valeur de fonctionnement (au moins au nombre de une) (102) de la source de pression et de décider sur la base de cette valeur de fonctionnement détectée, que la soupape de ventilation de réservoir fonctionne en mode ouvert ou fermé.
EP02754259A 2001-07-25 2002-06-21 Procede et appareil de commande pour diagnostics de fonctionnement d'une soupape de ventilation de reservoir d'installation de reservoir de carburant, notamment d'automobile Expired - Lifetime EP1415079B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10136183 2001-07-25
DE10136183A DE10136183A1 (de) 2001-07-25 2001-07-25 Verfahren und Steuergerät zur Funktionsdiagnose eines Tankentlüftungsventils einer Brennstofftankanlage insbesondere eines Kraftfahrzeuges
PCT/DE2002/002297 WO2003012278A1 (fr) 2001-07-25 2002-06-21 Procede et appareil de commande pour diagnostics de fonctionnement d'une soupape de ventilation de reservoir d'installation de reservoir de carburant, notamment d'automobile

Publications (2)

Publication Number Publication Date
EP1415079A1 true EP1415079A1 (fr) 2004-05-06
EP1415079B1 EP1415079B1 (fr) 2004-12-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02754259A Expired - Lifetime EP1415079B1 (fr) 2001-07-25 2002-06-21 Procede et appareil de commande pour diagnostics de fonctionnement d'une soupape de ventilation de reservoir d'installation de reservoir de carburant, notamment d'automobile

Country Status (5)

Country Link
US (1) US7162914B2 (fr)
EP (1) EP1415079B1 (fr)
JP (1) JP2004536998A (fr)
DE (2) DE10136183A1 (fr)
WO (1) WO2003012278A1 (fr)

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US20100147232A1 (en) * 2008-12-12 2010-06-17 Solutions With Water, Llc System and method for improving fuel economy in combustion engines
DE102008063758B4 (de) 2008-12-19 2018-02-15 Volkswagen Ag Verfahren zum Prüfen eines Tankentlüftungssystems
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JP5582367B2 (ja) * 2012-07-25 2014-09-03 株式会社デンソー 蒸発燃料処理装置
CN103983406A (zh) * 2014-05-07 2014-08-13 青岛双凌科技设备有限公司 一种汽车制动橡胶皮碗低温密封性能试验装置
CN106197902B (zh) * 2016-07-22 2019-01-18 华中科技大学 一种气密检测装置及其伺服控制方法
JP6654522B2 (ja) 2016-07-27 2020-02-26 愛三工業株式会社 蒸発燃料処理装置
CN108680311A (zh) * 2018-05-31 2018-10-19 广东国华人防科技有限公司 气密检测装置及其检测人防过滤吸收器的气密性的方法
US10717355B2 (en) 2018-12-19 2020-07-21 Ford Global Technologies, Llc Systems and methods for fuel tank grade vent valve diagnostics
DE102019215472B4 (de) * 2019-10-09 2023-05-11 Vitesco Technologies GmbH Verfahren sowie Vorrichtung zur Ermittlung des Durchflusses durch ein Taktventil
CN115126635A (zh) * 2021-03-26 2022-09-30 重庆金康赛力斯新能源汽车设计院有限公司 一种基于obd的燃油泄漏诊断方法和装置
US11428184B1 (en) 2021-04-26 2022-08-30 Ford Global Technologies, Llc Method and system for diagnosing grade vent valves

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Also Published As

Publication number Publication date
US7162914B2 (en) 2007-01-16
WO2003012278A1 (fr) 2003-02-13
JP2004536998A (ja) 2004-12-09
EP1415079B1 (fr) 2004-12-22
DE10136183A1 (de) 2003-02-20
US20050034513A1 (en) 2005-02-17
DE50201855D1 (de) 2005-01-27

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