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EP1269005B1 - Procede et dispositif pour verifier l'etancheite d'un systeme de reservoir d'un vehicule - Google Patents

Procede et dispositif pour verifier l'etancheite d'un systeme de reservoir d'un vehicule Download PDF

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Publication number
EP1269005B1
EP1269005B1 EP01921167A EP01921167A EP1269005B1 EP 1269005 B1 EP1269005 B1 EP 1269005B1 EP 01921167 A EP01921167 A EP 01921167A EP 01921167 A EP01921167 A EP 01921167A EP 1269005 B1 EP1269005 B1 EP 1269005B1
Authority
EP
European Patent Office
Prior art keywords
tank
tank system
threshold value
pressure
vehicle
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
EP01921167A
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German (de)
English (en)
Other versions
EP1269005A1 (fr
Inventor
Martin Streib
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1269005A1 publication Critical patent/EP1269005A1/fr
Application granted granted Critical
Publication of EP1269005B1 publication Critical patent/EP1269005B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M25/0809—Judging failure of purge control system

Definitions

  • the invention relates to a method and a device for leak testing of a tank system according to the preambles of the independent claims 1 and 4.
  • EP-A-0 952 332 a method and a device for the determination of leaks in the fuel supply system of a motor vehicle is known, in which the leak diagnosis is carried out by an analysis of a signal of a differential pressure sensor. Through this analysis, influencing factors such as the tank level and the fuel outgassing can be taken into account.
  • WO99 / 37905 discloses a leak detection method based on a volume of a sealed room containing a volatile liquid fuel.
  • the temperature of the fuel vapor in the air space of the tank is detected by means of a temperature sensor and this measure taken into account in determining whether there is a leak in the tank.
  • Initial and final parameters are measured at different times (start and end times) and these quantities are processed on the basis of a gas law and from this conclusions are drawn for the presence of a leak.
  • NVLD Natural Vacuum Leakage Detection
  • the problem here is that operating conditions exist in which does not occur in the shutdown the expected cooling of the tank, but even a warming occurs.
  • An example of this is driving in cold winter conditions and then parking the vehicle in a warm garage.
  • such a method does not take into account different types of fuel which, especially at summer ambient temperatures, have a vapor pressure which is above ambient pressure, due to the fact that volatile components of the fuel boil in the tank. By this boiling process, no negative pressure can build up even when cooling the tank, but on the contrary even creates an overpressure.
  • the invention is therefore based on the problem of eliminating the disadvantages mentioned above and to provide a method and apparatus for leak testing of a tank system, on the one hand regardless of the ambient temperature, on the other hand, regardless of the type of fuel in the tank reliable detection of a leak technically easy to implement manner allows.
  • the advantage of the method according to the invention for leak testing a tank system of a vehicle is that it is possible to reliably detect a leak by detecting the pressure profile in the shut-off tank by means of a pressure sensor, regardless of whether a pressure builds up in the tank.
  • the advantage of detecting the pressure by means of a pressure sensor is, in particular, also that both overpressures and negative pressures can be detected by the pressure sensor, so that both due to a self-adjusting or non-adjusting negative pressure as well as due to a self-adjusting or non-adjusting Overpressure on leaks can be closed.
  • the overpressure threshold value and the negative pressure threshold value are determined as a function of parameters characterizing the environmental influences, such as, for example, the ambient temperature or the tank level. This makes it possible to significantly increase the accuracy of the leak test.
  • a particularly advantageous embodiment which dispenses with such a gradient measurement, envisages closing on a dense tank system when the pressure arising in the tank system, after a predetermined waiting time has elapsed, either passes through a predefinable vacuum threshold value or a predefinable overpressure threshold value. In both cases, it can be concluded that there is a dense tank system, since an overpressure or underpressure would occur in the presence of a leak.
  • the method is not limited to the detection of a negative pressure, as is the case with the above-mentioned NVLD method. Rather, even in the case of environmental influences in which an overpressure arises in the tank, by means of the method according to the invention by the use the pressure sensor can be reliably closed to a leak.
  • the processing of the pressure sensor signal in a controller or circuit unit allows comparison with variable thresholds stored in the controller.
  • a controllable shut-off means for sealing the tank system is provided, also a pressure sensor for detecting the pressure prevailing in the tank system pressure and a control device both for controlling the shut-off and for processing the pressure sensor signals.
  • the function of the shut-off device can advantageously be taken over by the tank ventilation valve.
  • sensors for detecting the environmental influences in particular sensors for detecting the ambient temperature and a sensor for detecting the tank level can be provided, the signals of which can be processed in the control unit.
  • An embodiment of a tank system of a vehicle shown schematically in Fig. 1, comprises a tank 1 and an adsorption filter 2.
  • the tank 1 is over a tank connection line 5 is connected to the adsorption filter 2.
  • the adsorption filter 2 is connected to a further line 6 with an internal combustion engine 3.
  • a shut-off means in the form of a tank vent valve 7 is arranged, which can be controlled by a circuit unit 4.
  • a pressure sensor 8 is further arranged, the output signals are also supplied to the circuit unit 4.
  • the circuit unit 4 also sends and receives signals to / from the internal combustion engine in a manner known per se.
  • An error lamp 10 is used to display diagnostic results.
  • the tank venting valve 7 is opened, so that due to the pressure prevailing in the suction pipe 6 air of the atmosphere is sucked through a connected to the atmosphere line 9 via a filter 9a through the adsorption filter 2, whereby the accumulated in the adsorption filter 2 Hydrocarbons enter the intake manifold 40 and the internal combustion engine 3 are supplied.
  • a 9b arranged in the line can be controlled by the circuit unit 4 valve 9b is connected in the open position.
  • a sensor 8a for detecting the tank level and a sensor 8b for detecting the ambient temperature may be provided, the signals of which are supplied to the circuit unit 4.
  • step 10 it is checked whether the vehicle is turned off, i. the engine 3 is turned off and the vehicle is stationary (step 10). If this is the case, the tank venting valve 7 is closed in step 20, with which the tank can be sealed against the environment. It is understood that in this case, the line 9 is sealed by the controllable valve 9b.
  • step 30 the pressure in the tank system is detected by means of the pressure sensor 8.
  • the pressure is compared with a predetermined negative pressure threshold. If this vacuum threshold is undershot, i. If a negative pressure builds up in the tank 1 which is greater than this negative pressure threshold value, a message "tank tight" (step 41) is output and / or stored. If this is not the case, it is checked in step 50 whether the pressure exceeds a predetermined overpressure threshold, i. whether an overpressure builds up in the tank 1. If this is the case, in turn, in a step 51, a message "tank tight" is output and optionally stored.
  • step 60 and 62 it is checked whether the waiting time has exceeded a predetermined time threshold. Is not this the Case, the pressure is still detected and compared in the manner described above with the vacuum or overpressure threshold. On the other hand, if the waiting time exceeds a predetermined time threshold value, a leak could be present and an error entry "leak" in a memory, for example of the control device 4, is made in step 70 (step 70). Then, in step 80, it is checked whether at least one new measurement has taken place within a predetermined period of time, which is preferably in the weekly range.
  • a new measurement is made at a later time, if this is the case and this measurement has led to a defect entry "leak", in a step 90, a leak message is output and finally stored in the memory and / or the fault lamp 10 is activated.
  • the negative pressure threshold and the overpressure threshold may be dependent on the course of parameters, such as the ambient temperature, which is detected by the temperature sensor 86 on the vehicle, or the Tank level, which is detected by a tank level sensor (not shown) can be selected. This makes it possible to achieve an increase in the accuracy of the above-described leak test.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Examining Or Testing Airtightness (AREA)

Claims (5)

  1. Procédé pour vérifier l'étanchéité d'un système de réservoir d'un véhicule, selon lequel, une fois le moteur du véhicule coupé, on obture le réservoir (1) du véhicule au moyen d'un élément obturateur (7), à la suite de quoi on relève grâce à un capteur de pression la pression générée dans le système de réservoir et on conclut à un système de réservoir étanche lorsque la pression générée dans le système de réservoir passe, après un laps de temps prédéterminé, soit une valeur de seuil de dépression soit une valeur de seuil de surpression prédéterminables,
    caractérisé en ce qu'
    on mesure la température ambiante, et on modifie la valeur de seuil de dépression et la valeur de seuil de surpression en fonction de la température ambiante.
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'
    on conclut à un système non étanche lorsque l'on ne passe ni la valeur de seuil de dépression, ni la valeur de seuil de surpression lors d'une mise en oeuvre répétée du procédé selon la revendication 1 dans un intervalle de temps prédéterminé.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce qu'
    on obture hermétiquement le système de réservoir au moyen d'une soupape de dégazage du réservoir (7) commandable.
  4. Dispositif pour vérifier l'étanchéité d'un système de réservoir, comprenant un élément obturateur (7) commandable pour obturer hermétiquement le système de réservoir, un capteur de pression (8) pour relever la pression régnant dans le système de réservoir et un dispositif de commande (4) pour commander l'élément obturateur (7) et pour traiter les signaux du capteur de pression, suivant le procédé de la revendication 1,
    caractérisé par
    un capteur (8a) pour relever la température ambiante et un capteur (8b) pour relever le niveau de remplissage du réservoir, dont les signaux peuvent être traités dans le dispositif de commande (4).
  5. Dispositif selon la revendication 4,
    caractérisé en ce que
    l'élément obturateur commandable est une soupape de dégazage du réservoir (7).
EP01921167A 2000-03-17 2001-03-09 Procede et dispositif pour verifier l'etancheite d'un systeme de reservoir d'un vehicule Expired - Lifetime EP1269005B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10013347A DE10013347A1 (de) 2000-03-17 2000-03-17 Verfahren und Vorrichtung zur Dichtheitsprüfung eines Tanksystems eines Fahrzeugs
DE10013347 2000-03-17
PCT/DE2001/000883 WO2001069073A1 (fr) 2000-03-17 2001-03-09 Procede et dispositif pour verifier l'etancheite d'un systeme de reservoir d'un vehicule

Publications (2)

Publication Number Publication Date
EP1269005A1 EP1269005A1 (fr) 2003-01-02
EP1269005B1 true EP1269005B1 (fr) 2006-11-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01921167A Expired - Lifetime EP1269005B1 (fr) 2000-03-17 2001-03-09 Procede et dispositif pour verifier l'etancheite d'un systeme de reservoir d'un vehicule

Country Status (5)

Country Link
US (1) US6820466B2 (fr)
EP (1) EP1269005B1 (fr)
JP (1) JP2003527589A (fr)
DE (2) DE10013347A1 (fr)
WO (1) WO2001069073A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102024131150B3 (de) 2024-10-25 2025-11-20 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zur Dichtigkeitsprüfung eines Tanksystems und Kraftfahrzeug

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DE10038539A1 (de) 2000-08-03 2002-02-21 Bosch Gmbh Robert Verfahren und Vorrichtung zur energiesparenden Dichtheitsprüfung einer Brennstofftankanlage insbesondere eines Kraftfahrzeuges
US7562560B1 (en) * 2005-09-09 2009-07-21 Continental Automotive Canada, Inc. Engine off vacuum decay method for increasing pass/fail threshold using NVLD
DE102007016859A1 (de) 2006-12-27 2008-07-03 Robert Bosch Gmbh Verfahren zur Dichtheitsprüfung eines Tanksystems
DE102007034824A1 (de) * 2007-07-26 2009-01-29 Bayerische Motoren Werke Aktiengesellschaft Betriebsverfahren für ein Tankentlüftungssystem eines Kraftfahrzeugs sowie entsprechendes Tankentlüftungssystem
FR2929707B1 (fr) * 2008-04-03 2010-12-10 Alcatel Lucent Procede de controle de l'etancheite d'un contenant a tester et dispositif correspondant de mise en oeuvre
CN102338685B (zh) * 2011-05-18 2014-04-16 大连理工大学 压力容器气密性实验装置及方法
EP2666998A1 (fr) * 2012-05-25 2013-11-27 Inergy Automotive Systems Research (Société Anonyme) Procédé et système permettant de détecter rapidement l'absence de fuite dans un système de carburant
EP2666997A1 (fr) * 2012-05-25 2013-11-27 Inergy Automotive Systems Research (Société Anonyme) Procédé pour détecter la présence ou l'absence d'une fuite dans un système de carburant
DE102012212109A1 (de) 2012-07-11 2014-05-22 Bayerische Motoren Werke Aktiengesellschaft Tankentlüftungsanlage
US9759166B2 (en) 2015-09-09 2017-09-12 Ford Global Technologies, Llc Systems and methods for evaporative emissions testing
DE102015221053A1 (de) 2015-10-28 2017-05-04 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Überprüfen der Dichtheit einer Kraftstoffversorgungsanlage
DE102015221055A1 (de) * 2015-10-28 2017-05-04 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Überprüfen der Dichtheit einer Kraftstoffversorgungsanlage
EP3498515A1 (fr) * 2017-12-18 2019-06-19 Plastic Omnium Advanced Innovation and Research Procédé pour déterminer l'état thermodynamique du carburant dans un système de carburant
JP2021533373A (ja) * 2018-08-06 2021-12-02 プラスチック・オムニウム・アドヴァンスド・イノベーション・アンド・リサーチ 車両の液体タンクの少なくとも１つの内部補強要素の状態を試験するための方法
US12276240B2 (en) 2020-09-15 2025-04-15 Stoneridge Control Devices, Inc. Leak detection module entropy method for evaporative emissions system
JP7467387B2 (ja) * 2021-06-02 2024-04-15 愛三工業株式会社 蒸発燃料処理システムの漏れ診断装置

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DE102024131150B3 (de) 2024-10-25 2025-11-20 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zur Dichtigkeitsprüfung eines Tanksystems und Kraftfahrzeug

Also Published As

Publication number Publication date
JP2003527589A (ja) 2003-09-16
DE50111489D1 (de) 2007-01-04
WO2001069073A1 (fr) 2001-09-20
DE10013347A1 (de) 2001-10-11
US6820466B2 (en) 2004-11-23
US20030136182A1 (en) 2003-07-24
EP1269005A1 (fr) 2003-01-02

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