EP2122151A1 - Verfahren zur bestimmung der grösse eines lecks - Google Patents
Verfahren zur bestimmung der grösse eines lecksInfo
- Publication number
- EP2122151A1 EP2122151A1 EP08734616A EP08734616A EP2122151A1 EP 2122151 A1 EP2122151 A1 EP 2122151A1 EP 08734616 A EP08734616 A EP 08734616A EP 08734616 A EP08734616 A EP 08734616A EP 2122151 A1 EP2122151 A1 EP 2122151A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- time
- sub
- leak
- determining
- 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
- F02M25/0818—Judging failure of purge control system having means for pressurising the evaporative emission space
Definitions
- the invention relates to a method for determining the size of a leak in a liquid-containing tank device of a vehicle, in particular of a motor vehicle, wherein the liquid influences the pressure in the tank device by evaporation.
- DE 102 54 986 A1 discloses a method for tank leak diagnosis in a tank ventilation device, in which an increase in pressure in the tank ventilation device is calculated on the basis of outgassing or evaporating fuel by means of a mass balance and taken into account in the determination of a leak.
- the tank ventilation device is "evacuated", so that a negative pressure is created.
- a first pressure is generated in the tank device at a first time, which serves as a reference pressure for the further process.
- a first occurring pressure profile is detected up to a second time, which results from the evaporation of the liquid contained in the tank means.
- a second pressure is set at a third time, wherein the second pressure is different from the first pressure.
- BEST ⁇ TIGUNGSKOPSE First and third time is to be understood that at the respective time (the first or third) of the generated first and second pressure is present in the tank means. Subsequently, a second occurring pressure profile is detected from the third time to a fourth time. Again, the occurring pressure curve describes the pressure change in the tank means due to the evaporation of the liquid contained in the tank means. After detecting the first and the second pressure curve, the pressure gradient of the first pressure profile at the second time point and the pressure gradient of the second pressure profile at the third time point are determined. In addition, a first pressure difference of the present in the tank means pressure at the second time and the third time is determined to the reference pressure.
- the size of the leak is finally determined.
- the size of the leak having the above values can be easily determined by the following formula:
- the pressure gradient of the second pressure curve ((dp / dt) 5 ) is set in relation to the pressure gradient of the first pressure curve ((dp / dt) 2 ) and to the pressure differences at the second time (Ap 2 ) and the third time (Ap 5 ) normalized.
- the constants used here are the volume (V) of the tank device, the flow characteristic (.alpha.) Which characterizes the leak as the diaphragm, the density of the gas (p) present in the tank device, and the temperature of the gas (T).
- the basis for this formula is the assumption, according to the iris formula, that a leak rate is established which is proportional to the root of the respective pressure difference:
- Indices 1 and 2 respectively stand for the first phase (from the first time to the second time) and the second phase (from the third time to the fourth time) of the
- the respective leak rate (V 1L , V 2L ) corresponds to the volume flow which flows through the leak understood as the orifice.
- ambient pressure is generated as the first pressure in the tank device, that is to say a (gas) pressure which corresponds to the ambient pressure of the tank device.
- a (gas) pressure which corresponds to the ambient pressure of the tank device.
- a negative pressure is generated as the second pressure.
- the negative pressure is up to -16 mbar.
- the first pressure is generated by opening a vent valve of the tank device.
- the vent valve thus allows by opening a pressure equalization between the tank and its environment.
- the valve is advantageously opened so long until the ambient pressure has settled in the tank device.
- the first time thus corresponds to the time at which the valve is closed and the pressure in the tank means changes due to the evaporation of the liquid.
- the second pressure is generated by opening a connection to an intake tract of an internal combustion engine having the tank device producing regeneration valve.
- a regeneration valve is provided on a tank device, which establishes a connection from the tank device to the intake tract of the internal combustion engine in the open state. In operation, this creates a suction, which leads to a negative pressure in the tank system.
- the regeneration valve is closed at the third time, after which the pressure in the tank means changes solely on account of the leak and the evaporation of the liquid.
- the second and / or the fourth time point is selected so that the respectively determined pressure gradient the pressure curve in the respective phase of the process sufficiently descriptive, so that an accurate statement about the size of the leak is possible.
- FIG. 1a shows a diagram in which the pressure p present in a tank device is plotted over the time t in seconds.
- FIG. 1b shows the switching states of a ventilation valve 1 and of a regeneration valve 2 of the tank device, the ventilation valve 1 or the regeneration valve 2 being closed in a first state 3 or 4 and being opened in a second state 5 or 6.
- the switching states 3, 4, 5, 6 are also plotted over the time t.
- the bold curve 7 in FIG. 1a indicates the measured pressure curve in the tank device.
- the vent valve 1 is closed, so that the present in the tank means pressure is influenced only by the evaporation or outgassing of the liquid located in the tank means and a leak in the tank means.
- the evaporation or the outgassing is understood here as a volume flow or as evaporation rate.
- the gas flowing out through the leak is understood as a volume flow or leak rate, the leak being understood as a diaphragm.
- the pressure in the tank means is equal to the ambient pressure Po.
- This set first pressure P 1 serves as a reference pressure for the further process.
- the pressure p in the tank means increases in accordance with the evaporation and the size of the leak or according to the evaporation rate and the leak rate, and, as it increases less with increasing time due to an adjusting balance between the tank interior and the environment.
- a curve 8 starting from the point of time ti shows the theoretical pressure rise in the event that there is no leak in the tank device.
- the ventilation valve 1 is opened and it turns in the tank means the ambient pressure p 0 a.
- the regeneration valve 2 is opened, so that a connection to the intake tract of the internal combustion engine having the tank device is produced, so that a suction is created and in the tank means a negative pressure p 4 is generated, wherein the negative pressure p 4 corresponds to the pressure which exists when the regeneration valve 2 is closed at the time t 4 .
- the pressure p in the tank device increases again due to the evaporation rate and the leak rate. Due to the negative pressure, ambient air flows into the tank, so that the pressure increase due only to the evaporation would be lower, as shown by the curve 9.
- the ventilation valve 1 is opened again and there is a pressure compensation, so that in the tank means the ambient pressure p 0 is present.
- the size of the leak is now determined as follows:
- a leak rate is established which is proportional to the root of the respective pressure difference.
- the times t 2 and t 4 are considered , whereby according to the diaphragm formula, the ratio of the leakage rates at the time t 2 and the time U corresponds to the ratio of the root of the pressure difference at the time t 2 to the root of the pressure difference Time t 4 corresponds to:
- the pressure p 2 or p 4 present in the tank device at the time t 2 or t 4 is determined as the pressure difference to the outlet pressure p 0 , which corresponds to the ambient pressure.
- the volume flow can be replaced by the pressure gradient to determine the leakage in the second phase V AL:
- the cross-sectional area of the leak is calculated on the basis of the volume flow through a diaphragm with the above leak rate as follows:
- ⁇ stands for the flow rate characteristic of the leak understood as the aperture
- A for the cross-sectional area of the leak
- R for the Gesakonstante
- T for the temperature
- p for the density of the incoming and outflowing gas
- leaks can be determined with a diameter from 0.5 mm.
- the prerequisite for this is the assumption that during the overpressure phase (ti to t 2 ) and the negative pressure phase (U to t 5 ), a constant evaporation rate
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)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007012200A DE102007012200A1 (de) | 2007-03-14 | 2007-03-14 | Verfahren zur Bestimmung der Größe eines Lecks |
| PCT/EP2008/002071 WO2008110381A1 (de) | 2007-03-14 | 2008-03-14 | Verfahren zur bestimmung der grösse eines lecks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2122151A1 true EP2122151A1 (de) | 2009-11-25 |
| EP2122151B1 EP2122151B1 (de) | 2016-06-22 |
Family
ID=39674848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08734616.9A Not-in-force EP2122151B1 (de) | 2007-03-14 | 2008-03-14 | Verfahren zur bestimmung der grösse eines lecks |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8751174B2 (de) |
| EP (1) | EP2122151B1 (de) |
| CN (1) | CN101646858B (de) |
| DE (1) | DE102007012200A1 (de) |
| WO (1) | WO2008110381A1 (de) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8457908B2 (en) | 2009-06-11 | 2013-06-04 | University Of Washington | Sensing events affecting liquid flow in a liquid distribution system |
| ITMI20091555A1 (it) * | 2009-09-10 | 2011-03-10 | Audi Ag | Metodo per la determinazione della grandezza di una perdita |
| US20140334946A1 (en) * | 2013-05-08 | 2014-11-13 | Volvo Car Corporation | Leakage detection system and method for fuel tank systems |
| US9399970B2 (en) * | 2013-10-01 | 2016-07-26 | Ford Global Technologies, Llc | Combination pressure- and vacuum-based EVAP leak detection method |
| JP2015075032A (ja) * | 2013-10-09 | 2015-04-20 | 愛三工業株式会社 | 蒸発燃料処理装置の故障検出装置 |
| US10352814B2 (en) | 2015-11-10 | 2019-07-16 | Phyn Llc | Water leak detection using pressure sensing |
| JP6536476B2 (ja) * | 2016-05-13 | 2019-07-03 | 株式会社デンソー | エバポリークチェックシステム、および、これを用いたエバポリークのチェック方法 |
| US10094095B2 (en) * | 2016-11-04 | 2018-10-09 | Phyn, Llc | System and method for leak characterization after shutoff of pressurization source |
| CN110230547B (zh) * | 2019-05-27 | 2021-11-23 | 江苏大学 | 一种车载燃油泄漏检测方法及其检测系统 |
| CN111946477B (zh) * | 2020-07-23 | 2021-08-31 | 东风汽车集团有限公司 | 一种碳罐清洗电磁阀泄漏的监测方法 |
| CN114088309B (zh) * | 2020-08-24 | 2024-10-08 | 中国航发商用航空发动机有限责任公司 | 密闭容腔气密性检查方法 |
| CN114320637B (zh) * | 2021-12-31 | 2023-03-21 | 中国第一汽车股份有限公司 | 一种燃油蒸发泄漏检测方法 |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4350492A (en) * | 1981-08-24 | 1982-09-21 | Vascor, Inc. | Method for preparing tissue heart valve |
| KR900005610Y1 (ko) * | 1987-04-16 | 1990-06-28 | 이형곤 | 차압 2중 진공 씨스템 |
| DE4342431A1 (de) * | 1993-12-11 | 1995-06-14 | Bosch Gmbh Robert | Verfahren zur Ermittlung von Aussagen über den Zustand einer Tankentlüftungsanlage |
| JPH0968112A (ja) | 1995-09-01 | 1997-03-11 | Denso Corp | 燃料蒸発ガスパージシステム |
| JP3411768B2 (ja) * | 1996-12-13 | 2003-06-03 | 株式会社日立製作所 | エバポシステムの診断装置 |
| DE19713085C2 (de) * | 1997-03-27 | 2003-06-12 | Siemens Ag | Verfahren zum Überprüfen der Funktionstüchtigkeit einer Tankentlüftungsanlage für ein Kraftfahrzeug |
| US6082337A (en) * | 1997-07-11 | 2000-07-04 | Denso Corporation | Abnormality detection apparatus for preventing fuel gas emission |
| JP2001182629A (ja) * | 1999-12-27 | 2001-07-06 | Fuji Heavy Ind Ltd | エバポパージシステムの診断装置および圧力センサ |
| US6269803B1 (en) * | 2000-02-22 | 2001-08-07 | Jaguar Cars Limited | Onboard diagnostics for vehicle fuel system |
| DE50111733D1 (de) * | 2000-04-06 | 2007-02-08 | Bosch Gmbh Robert | Verfahren zur dichtheitsprüfung einer tankentlüftungsanlage eines fahrzeugs |
| DE10143329A1 (de) * | 2001-09-05 | 2003-04-03 | Bosch Gmbh Robert | Verfahren und elektronische Steuereinrichtung zur Erkennung von Lecks in Tankentlüftungsanlagen bei Kraftfahrzeugen |
| DE10328364A1 (de) * | 2002-06-25 | 2004-02-12 | Mitsubishi Jidosha Kogyo K.K. | Fehlerdiagnosevorrichtung eines Kraftstoffverdampfungs/Verflüchtigungs-Verhinderungssystems |
| DE10254986B4 (de) | 2002-11-26 | 2016-03-03 | Robert Bosch Gmbh | Verfahren zur Tankleckdiagnose |
| JP2004353559A (ja) * | 2003-05-29 | 2004-12-16 | Hitachi Unisia Automotive Ltd | 蒸発燃料処理装置のリーク診断装置 |
| US6909839B2 (en) * | 2003-07-23 | 2005-06-21 | Advanced Technology Materials, Inc. | Delivery systems for efficient vaporization of precursor source material |
| EP1816338A1 (de) * | 2006-02-07 | 2007-08-08 | Inergy Automotive Systems Research (SA) | Verfahren zur Erkennung von Leckagen und zugehöriges Kraftstoffsystem |
-
2007
- 2007-03-14 DE DE102007012200A patent/DE102007012200A1/de not_active Withdrawn
-
2008
- 2008-03-14 CN CN200880008288XA patent/CN101646858B/zh not_active Expired - Fee Related
- 2008-03-14 EP EP08734616.9A patent/EP2122151B1/de not_active Not-in-force
- 2008-03-14 WO PCT/EP2008/002071 patent/WO2008110381A1/de not_active Ceased
- 2008-03-14 US US12/531,159 patent/US8751174B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008110381A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2122151B1 (de) | 2016-06-22 |
| CN101646858B (zh) | 2012-07-11 |
| DE102007012200A1 (de) | 2008-09-18 |
| WO2008110381A1 (de) | 2008-09-18 |
| CN101646858A (zh) | 2010-02-10 |
| US20110307195A1 (en) | 2011-12-15 |
| US8751174B2 (en) | 2014-06-10 |
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