EP1269005A1 - Verfahren und vorrichtung zur dichtheitsprüfung eines tanksystems eines fahrzeugs - Google Patents
Verfahren und vorrichtung zur dichtheitsprüfung eines tanksystems eines fahrzeugsInfo
- Publication number
- EP1269005A1 EP1269005A1 EP01921167A EP01921167A EP1269005A1 EP 1269005 A1 EP1269005 A1 EP 1269005A1 EP 01921167 A EP01921167 A EP 01921167A EP 01921167 A EP01921167 A EP 01921167A EP 1269005 A1 EP1269005 A1 EP 1269005A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tank
- tank system
- pressure
- threshold value
- shut
- 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
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
Definitions
- the invention relates to a method and a device for leak testing a tank system.
- the problem here is that there are operating conditions in which the expected cooling of the tank does not occur in the shutdown phase, but even heating.
- An example of this is a journey in winter in a cold environment and then parking the vehicle in a warm garage.
- the invention is therefore based on the problem of eliminating the disadvantages mentioned above and of providing a method and a device for leak testing a tank system which, on the one hand, independently of the ambient temperature and, on the other hand, regardless of the type of fuel in the tank, reliably detects a leak technically easy to implement.
- the advantage of the method according to the invention for the leak test of a tank system of a vehicle is that by detecting the pressure curve in the blocked tank by means of a pressure sensor, a leak can be reliably concluded regardless of whether a negative or positive pressure builds up in the tank.
- the advantage of detecting the pressure by means of a pressure sensor is in particular that both overpressures and underpressures can be detected by the pressure sensor, so that both due to an underpressure which is or does not occur and because of an overpressure which is or does not occur Leaks can be closed.
- a particularly advantageous embodiment which dispenses with such a gradient measurement, provides that a dense tank system is concluded when the pressure generated in the tank system passes either a predeterminable vacuum threshold value or a predeterminable overpressure threshold value after a predetermined waiting time has elapsed. In both cases, a tight tank system can be concluded, since an overpressure or underpressure would occur if there was a leak. It is particularly advantageous that 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, a leak can be reliably concluded by the method according to the invention by using the pressure sensor.
- the processing of the pressure sensor signal in a control unit or a circuit unit allows a comparison with variable threshold values that are stored in the control unit.
- the overpressure threshold value and the underpressure threshold value are advantageously determined in dependence on parameters characterizing the environmental influences, such as e.g. ambient temperature or tank level. This enables a significant increase in the accuracy of the leak test.
- a controllable shut-off means are provided for tightly closing the tank system, further a pressure sensor for detecting the pressure prevailing in the tank system and a control device both for controlling the shut-off means and for processing the pressure sensor signals.
- This device is its simple structure, for example, it can be easily retrofitted to existing tank systems, since a control device is available in practically all modern vehicles. It is therefore only necessary to provide a pressure sensor in the tank system and a shut-off device.
- shut-off means 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 fill level, can also be provided, the signals of which can be processed in the control unit.
- Fig. 1 shows a tank system of a vehicle in which the method according to the invention can be used
- FIG. 2 schematically shows a flow chart of the method according to the invention.
- An exemplary 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 connected to the adsorption filter 2 via a tank connection line 5.
- 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 ventilation valve 7 is arranged in line 6 and can be controlled by a circuit unit 4.
- a pressure sensor 8 is also arranged in the tank 1, the output signals of which are likewise fed 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.
- Evaporation produces hydrocarbons in the tank 1, which accumulate in the adsorption filter 2.
- the tank ventilation valve 7 is opened, so that due to the in the intake manifold 6, negative air prevailing in the atmosphere is sucked through a line 9 connected to the atmosphere through a filter 9a through the adsorption filter 2, whereby the hydrocarbons accumulated in the adsorption filter 2 enter the intake manifold 40 and are fed to the internal combustion engine 3.
- a valve 9b arranged in line 9 and controllable by circuit unit 4 is switched to the open position.
- a sensor 8a for detecting the tank fill level and a sensor 8b for detecting the ambient temperature can be provided, the signals of which are supplied to the circuit unit 4.
- step 10 it is checked in a step 10 whether the vehicle is parked, i.e. the internal combustion engine 3 is switched off and the vehicle is stationary (step 10). If this is the case, the tank ventilation valve 7 is closed in step 20, with which the tank can be sealed off from the environment. It goes without saying that in this case the line 9 is also tightly closed by the controllable valve 9b.
- step 30 The pressure in the tank system is then detected in step 30 by means of the pressure sensor 8.
- the pressure is compared to a predetermined vacuum threshold. If this negative pressure threshold is undershot, ie 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 a step 50 whether the pressure exceeds a predetermined overpressure threshold value, ie whether an overpressure builds up in the tank 1. If this is the case, a "tank-tight" message is again output in step 51 and possibly saved.
- step 60 and 62 a check is carried out to determine whether the waiting time has exceeded a predetermined time threshold. If this is not the case, the pressure is still recorded and compared with the negative pressure or positive pressure threshold value in the manner described above. If, on the other hand, the waiting time exceeds a predefined time threshold value, there could be a leak and in step 70 an error entry “leak” is made in a memory, for example of the control device 4 (step 70). It is then checked in step 80 whether at least one new measurement has taken place within a predetermined time period, which is preferably in the weekly range.
- the negative pressure threshold value and the positive pressure threshold value can 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 fill level, which is detected by a tank fill level sensor (not shown). This enables an increase in the accuracy of the leak test described above to be achieved.
Landscapes
- 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)
Abstract
Description
Claims
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 (de) | 2000-03-17 | 2001-03-09 | Verfahren und vorrichtung zur dichtheitsprüfung eines tanksystems eines fahrzeugs |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1269005A1 true EP1269005A1 (de) | 2003-01-02 |
EP1269005B1 EP1269005B1 (de) | 2006-11-22 |
Family
ID=7635328
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01921167A Expired - Lifetime EP1269005B1 (de) | 2000-03-17 | 2001-03-09 | Verfahren und vorrichtung zur dichtheitsprüfung eines tanksystems eines fahrzeugs |
Country Status (5)
Country | Link |
---|---|
US (1) | US6820466B2 (de) |
EP (1) | EP1269005B1 (de) |
JP (1) | JP2003527589A (de) |
DE (2) | DE10013347A1 (de) |
WO (1) | WO2001069073A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007016859A1 (de) | 2006-12-27 | 2008-07-03 | Robert Bosch Gmbh | Verfahren zur Dichtheitsprüfung eines Tanksystems |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 (de) * | 2012-05-25 | 2013-11-27 | Inergy Automotive Systems Research (Société Anonyme) | Verfahren und System zur schnellen Erkennung des Nichtvorhandenseins eines Lecks in einem Kraftstoffsystem |
EP2666997A1 (de) * | 2012-05-25 | 2013-11-27 | Inergy Automotive Systems Research (Société Anonyme) | Verfahren zur Erkennung des Vorhandensein oder Nichtvorhandensein eines Lecks in einem Kraftstoffsystem |
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 (de) * | 2017-12-18 | 2019-06-19 | Plastic Omnium Advanced Innovation and Research | Verfahren zur bestimmung des thermodynamischen zustands des kraftstoffs in einem kraftstoffsystem |
EP3833953A1 (de) * | 2018-08-06 | 2021-06-16 | Plastic Omnium Advanced Innovation And Research | Verfahren zur prüfung des zustands von mindestens einem internen verstärkungselement eines flüssigkeitstanks eines fahrzeugs |
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 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3206130C2 (de) * | 1982-02-20 | 1986-07-03 | Walter 2000 Hamburg Nicolai | Einrichtung zur Ermittlung und Anzeige der Menge eines flüssigen oder festen Lagergutes |
DE4003751C2 (de) * | 1990-02-08 | 1999-12-02 | Bosch Gmbh Robert | Tankentlüftungsanlage für ein Kraftfahrzeug und Verfahren zum Überprüfen deren Funktionstüchtigkeit |
DE4124465C2 (de) * | 1991-07-24 | 2002-11-14 | Bosch Gmbh Robert | Tankentlüftungsanlage und Kraftfahrzeug mit einer solchen sowie Verfahren und Vorrichtung zum Prüfen der Funktionsfähigkeit einer solchen |
US5295472A (en) * | 1992-01-06 | 1994-03-22 | Toyota Jidosha Kabushiki Kaisha | Apparatus for detecting malfunction in evaporated fuel purge system used in internal combustion engine |
DE4232148A1 (de) * | 1992-09-25 | 1994-03-31 | Bayerische Motoren Werke Ag | Verfahren zur Dichtheitsprüfung einer Tankanlage für Kraftfahrzeuge |
GB9302958D0 (en) | 1993-02-13 | 1993-03-31 | Lucas Ind Plc | Method of and apparatus for detecting fuel system leak |
JP3090051B2 (ja) | 1996-07-16 | 2000-09-18 | トヨタ自動車株式会社 | 燃料蒸気処理装置の故障診断装置 |
DE19636431B4 (de) | 1996-09-07 | 2009-05-14 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Prüfung der Funktionsfähigkeit einer Tankentlüftungsanlage |
DE19750193A1 (de) * | 1997-11-13 | 1999-05-20 | Bosch Gmbh Robert | Kfz-Tankdichtheitsdiagnose bei Änderungen der Kfz-Betriebshöhe |
US6089081A (en) | 1998-01-27 | 2000-07-18 | Siemens Canada Limited | Automotive evaporative leak detection system and method |
DE19818697A1 (de) * | 1998-04-25 | 1999-10-28 | Opel Adam Ag | Verfahren zur Bestimmung von Leckagen im Kraftstoffversorgungssystem eines Kraftfahrzeuges |
DE19830234C2 (de) * | 1998-07-07 | 2000-06-08 | Daimler Chrysler Ag | Verfahren zum Prüfen einer Tankanlage in einem Kraftfahrzeug auf Dichtheit |
-
2000
- 2000-03-17 DE DE10013347A patent/DE10013347A1/de not_active Ceased
-
2001
- 2001-03-09 DE DE50111489T patent/DE50111489D1/de not_active Expired - Lifetime
- 2001-03-09 US US10/221,856 patent/US6820466B2/en not_active Expired - Lifetime
- 2001-03-09 EP EP01921167A patent/EP1269005B1/de not_active Expired - Lifetime
- 2001-03-09 JP JP2001567928A patent/JP2003527589A/ja not_active Withdrawn
- 2001-03-09 WO PCT/DE2001/000883 patent/WO2001069073A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0169073A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007016859A1 (de) | 2006-12-27 | 2008-07-03 | Robert Bosch Gmbh | Verfahren zur Dichtheitsprüfung eines Tanksystems |
US7963150B2 (en) | 2006-12-27 | 2011-06-21 | Robert Bosch Gmbh | Method to test for a leak in a fuel tank system |
Also Published As
Publication number | Publication date |
---|---|
DE50111489D1 (de) | 2007-01-04 |
DE10013347A1 (de) | 2001-10-11 |
JP2003527589A (ja) | 2003-09-16 |
WO2001069073A1 (de) | 2001-09-20 |
US6820466B2 (en) | 2004-11-23 |
US20030136182A1 (en) | 2003-07-24 |
EP1269005B1 (de) | 2006-11-22 |
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