EP0589176B1 - Verfahren zur Dichtheitsprüfung einer Tankanlage für Kraftfahrzeuge - Google Patents

Verfahren zur Dichtheitsprüfung einer Tankanlage für Kraftfahrzeuge Download PDF

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Publication number
EP0589176B1
EP0589176B1 EP93112017A EP93112017A EP0589176B1 EP 0589176 B1 EP0589176 B1 EP 0589176B1 EP 93112017 A EP93112017 A EP 93112017A EP 93112017 A EP93112017 A EP 93112017A EP 0589176 B1 EP0589176 B1 EP 0589176B1
Authority
EP
European Patent Office
Prior art keywords
tank
internal combustion
combustion engine
test
tightness
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
EP93112017A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0589176A2 (de
EP0589176A3 (enrdf_load_stackoverflow
Inventor
Axel-Rene Michelet
Siegfried Wesinger
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 EP0589176A2 publication Critical patent/EP0589176A2/de
Publication of EP0589176A3 publication Critical patent/EP0589176A3/xx
Application granted granted Critical
Publication of EP0589176B1 publication Critical patent/EP0589176B1/de
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
    • F02M25/0809—Judging failure of purge control system

Definitions

  • the invention relates to a method according to the preamble of patent claim 1.
  • the negative pressure is generated during operation of the motor vehicle with the internal combustion engine running.
  • the tank ventilation valve is opened and a connection is established between the tank and the intake manifold of the internal combustion engine. Since the negative pressure prevailing there is dependent on the operating conditions of the internal combustion engine and is subject to strong fluctuations which reach up to the atmospheric pressure at full load, the known method can only be used under stable operating conditions of the internal combustion engine. This will preferably be idle mode. Since the test takes a certain amount of time, the test must be started again each time the stable idle conditions change. Such changes result, for example, when an air conditioning system or another consumer is switched on or off due to the associated change in the idle speed of the internal combustion engine and in a so-called gas surge in which the vehicle operator briefly actuates the accelerator pedal while idling.
  • the invention has for its object to provide a method of the type mentioned, which largely free of interference allows a reliable statement about the tightness of the tank system.
  • the invention solves this problem for the method by the features of claim 1.
  • the vacuum is supplied by a separate device, which is a vacuum pump or a vacuum accumulator.
  • a vacuum pump or a vacuum accumulator.
  • This vacuum accumulator therefore fulfills two functions. During the operation of the motor vehicle, it increases the braking force or reduces the steering forces, and after the motor vehicle is switched off it is used to check the tightness of the tank system.
  • This test can be carried out immediately after the internal combustion engine has been switched off. Additionally or alternatively, the test can also be carried out a few minutes after the internal combustion engine has been switched off. This offers the advantage that influences on the fuel that have not yet subsided when the motor vehicle is switched off can then be excluded with certainty. Such influences can be sloshing movements of the fuel or changes in temperature due to the heat radiation from the exhaust system. The test a few minutes after parking the motor vehicle usually takes place under thermally and mechanically stable conditions and enables external interference to be largely eliminated.
  • the vacuum test can be carried out in different ways. For example, it is possible to set a vacuum of a defined size and to observe the time until this vacuum is reached or the course of the vacuum after it has been reached. Of course, this presupposes that the tank system is at least sufficiently tight that the negative pressure can build up. Alternatively, it is possible to set the negative pressure using a memory of a defined size. The course of the vacuum and / or the maximum value reached and / or the subsequent drop in the vacuum is registered here. From the values obtained, the tightness of the tank system can be reliably determined or a leak can be detected.
  • the tank system shown in Fig. 1 consists of the following parts:
  • a fuel tank KB contains a supply of fuel K and is connected via a line L to the intake manifold SR of an internal combustion engine, not shown in detail.
  • a throttle valve DK sits in the intake manifold SR and is used to control the air supply to the internal combustion engine.
  • AKF activated carbon filter
  • line L there is a tank vent valve TEV and an activated carbon filter AKF, which is provided with a shut-off valve AAV.
  • the AKF activated carbon filter can be connected to the atmosphere via the shut-off valve AAV.
  • the structure shown corresponds to the usual and enables the fuel vapors escaping from the fuel K and stored in the activated carbon filter AKF and other gas components of the fuel K to be discharged with the tank ventilation valve open via the negative pressure that is usually present in the intake manifold and fed into the internal combustion engine with the aid of a control unit SG burn.
  • the shut-off valve AAV is not closed and the activated carbon filter AKF is connected to the atmosphere.
  • a vacuum accumulator UDS is additionally provided, which is part of a brake booster, not shown, for example.
  • the vacuum accumulator UDS is connected on the one hand to the line L via a check valve RV and on the other hand to the fuel tank KB via a line UL, in which has a throttle D and an adjustable shut-off valve SAV.
  • the vacuum accumulator is evacuated to a maximum via the check valve RV and the line L through the vacuum in the intake manifold SR.
  • the shutoff valve SAV is opened by the control unit SG.
  • the negative pressure contained in the memory UDS is applied via the line UL in the fuel tank KB. This happens a few minutes after the internal combustion engine is switched off and is damped by the throttle D.
  • a tank pressure sensor TDS measures the negative pressure in the fuel tank KB in the gas volume above the fuel K and enters the result as a measured value in the control unit SG. There, the course of the negative pressure is registered both during the build-up and after the breakdown that has also occurred is exceeded.
  • the tank system extends from the filler neck E of the fuel tank KB to the activated carbon filter AKF, the shut-off valve AAV closed during this test and the tank vent valve TEV, which is also closed.
  • This test result is not influenced by the operating behavior of the internal combustion engine.
  • a vacuum reservoir UDS which is usually already present, is used to carry it out. The effort required for the test can thus be kept low. Except for the line UL and the shut-off valve RV and the throttle D, no further components are then required. It can be seen that external transientities, such as occur when the system is checked with the internal combustion engine running, do not occur here.
  • the test result is reproducible. This also makes it possible to compare successive test results, which are obtained, for example, individually after the internal combustion engine has been switched off, and to determine changes due to a leakage error that is only gradually emerging.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
EP93112017A 1992-09-25 1993-07-28 Verfahren zur Dichtheitsprüfung einer Tankanlage für Kraftfahrzeuge Expired - Lifetime EP0589176B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4232148 1992-09-25
DE4232148A DE4232148A1 (de) 1992-09-25 1992-09-25 Verfahren zur Dichtheitsprüfung einer Tankanlage für Kraftfahrzeuge

Publications (3)

Publication Number Publication Date
EP0589176A2 EP0589176A2 (de) 1994-03-30
EP0589176A3 EP0589176A3 (enrdf_load_stackoverflow) 1994-08-03
EP0589176B1 true EP0589176B1 (de) 1997-04-16

Family

ID=6468829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93112017A Expired - Lifetime EP0589176B1 (de) 1992-09-25 1993-07-28 Verfahren zur Dichtheitsprüfung einer Tankanlage für Kraftfahrzeuge

Country Status (2)

Country Link
EP (1) EP0589176B1 (enrdf_load_stackoverflow)
DE (2) DE4232148A1 (enrdf_load_stackoverflow)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0835452A (ja) * 1994-07-26 1996-02-06 Hitachi Ltd エバポパージシステムの診断方法
SE515496C2 (sv) * 1994-11-04 2001-08-13 Volvo Personvagnar Ab Förfarande och anordning för provning av tätheten hos en sluten behållare
DE19818697A1 (de) * 1998-04-25 1999-10-28 Opel Adam Ag Verfahren zur Bestimmung von Leckagen im Kraftstoffversorgungssystem eines Kraftfahrzeuges
DE19833865A1 (de) * 1998-07-28 2000-02-03 Bosch Gmbh Robert Vorrichtung und Verfahren zur Prüfung der Funktionsfähigkeit einer Tankentlüftungsanlage einer Brennkraftmaschine
DE19910486A1 (de) * 1999-03-10 2000-09-14 Bielomatik Leuze & Co Einrichtung und Verfahren zur Durchflußprüfung eines Behälter-Anschlusses
DE19918456A1 (de) * 1999-04-23 2000-10-26 Bayerische Motoren Werke Ag Kraftstoff-Fördersystem für ein Kraftfahrzeug
US6722189B2 (en) * 2000-02-22 2004-04-20 Siemens Automotive S.A. Leak detection in a closed vapor handling system using a pressure switch and time
LU90530B1 (en) * 2000-02-23 2001-08-24 Delphi Tech Inc Fuel tank installation
DE10013347A1 (de) * 2000-03-17 2001-10-11 Bosch Gmbh Robert Verfahren und Vorrichtung zur Dichtheitsprüfung eines Tanksystems eines Fahrzeugs
DE10034391A1 (de) * 2000-07-14 2002-01-24 Alfmeier Praez Ag Vorrichtung zur Regenerierung eines Aktivkohlefilters
DE102008052763B4 (de) 2008-10-22 2017-03-30 Bayerische Motoren Werke Aktiengesellschaft Tankentlüftungseinrichtung für ein Kraftfahrzeug

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991012426A1 (de) * 1990-02-08 1991-08-22 Robert Bosch Gmbh Tankentlüftungsanlage für einen kraftfahrzeug und verfahren zum überprüfen deren funktionstüchtigkeit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1631339A1 (ru) * 1988-08-17 1991-02-28 Ленинградский институт инженеров железнодорожного транспорта им.акад.В.Н.Образцова Способ проверки внутренних полостей двигателей внутреннего сгорани на герметичность
DE4025544A1 (de) * 1990-03-30 1991-10-02 Bosch Gmbh Robert Tankentlueftungsanlage fuer ein kraftfahrzeug und verfahren zum ueberpruefen deren funktionstuechtigkeit
DE4040896A1 (de) * 1990-12-20 1992-06-25 Bosch Gmbh Robert Tankentlueftungsanlage und verfahren zum ueberpruefen der dichtheit derselben
DE4107787A1 (de) * 1991-03-11 1992-09-17 Pierburg Gmbh Vorrichtung zum messen des anteils fluessigen brennstoffs in einem tank
DE4107786A1 (de) * 1991-03-11 1992-09-17 Pierburg Gmbh Vorrichtung zum messen des anteils fluessigen brennstoffs in einem tank
DE4108856C2 (de) * 1991-03-19 1994-12-22 Bosch Gmbh Robert Tankentlüftungsanlage sowie Verfahren und Vorrichtung zum Überprüfen der Dichtheit derselben
DE4111360A1 (de) * 1991-04-09 1992-10-15 Bosch Gmbh Robert Verfahren und vorrichtung zum pruefen einer tankentluefungsanlage
DE4132055A1 (de) * 1991-09-26 1993-04-01 Bosch Gmbh Robert Verfahren und vorrichtung zum pruefen der funktionsfaehigkeit einer tankentlueftungsanlage

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991012426A1 (de) * 1990-02-08 1991-08-22 Robert Bosch Gmbh Tankentlüftungsanlage für einen kraftfahrzeug und verfahren zum überprüfen deren funktionstüchtigkeit

Also Published As

Publication number Publication date
DE59306165D1 (de) 1997-05-22
EP0589176A2 (de) 1994-03-30
DE4232148A1 (de) 1994-03-31
EP0589176A3 (enrdf_load_stackoverflow) 1994-08-03

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