EP1013917A2 - Verfahren zum Prüfen eines Tankentlüftungssystems - Google Patents
Verfahren zum Prüfen eines Tankentlüftungssystems Download PDFInfo
- Publication number
- EP1013917A2 EP1013917A2 EP99123162A EP99123162A EP1013917A2 EP 1013917 A2 EP1013917 A2 EP 1013917A2 EP 99123162 A EP99123162 A EP 99123162A EP 99123162 A EP99123162 A EP 99123162A EP 1013917 A2 EP1013917 A2 EP 1013917A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- tank
- cross
- tank ventilation
- correlation
- filter device
- 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
Images
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
Definitions
- the invention relates to a method for testing a tank ventilation system, in particular a motor vehicle, with those mentioned in the preamble of claim 1 Characteristics.
- the function of the Tank ventilation system is monitored.
- the switching means solenoid valve
- the invention has for its object to a method of the generic type create a simple way to check a tank ventilation system is possible.
- this object is achieved by a method with the method described in claim 1 mentioned features solved.
- a control signal for the switching means with a measured value defining a state of the suction system is cross-correlated and a correlation coefficient is evaluated as a diagnostic signal of the tank ventilation system a very reliable diagnostic result is advantageously obtained.
- Correlation method to determine the similarity of two curves, here the control signal and the the variable defining the suction system are reliable and easy to use handling procedures known. These procedures have no relevant influence the measured variables to be correlated, so that an influence on the operation of the Tank ventilation system or the entire internal combustion engine is not given for motor vehicles.
- Such cross-correlation methods are also very robust, so that the release conditions for the implementation of the Procedure can be reduced to a minimum. Such release conditions are, in particular, parallel diagnostic methods or control or Regulation procedure, which is due to the cross correlation mentioned here could be affected.
- the state of the Measurement system defining a suction pipe pressure or a Throttle position is used.
- These parameters are easy to pick up and are already available in the usual equipment of motor vehicles.
- the cross-correlation by an engine control unit of the motor vehicle is carried out, the measured variables can be tapped in a simple manner.
- FIG. 1 shows a tank ventilation system 10.
- the tank ventilation system 10 comprises one Connection line 12, a tank 14 with a suction system 16 a Internal combustion engine 18 connects.
- the suction system 16 has a suction pipe 20, so that 22 combustion air can be sucked in by means of negative pressure from a source.
- the Combustion air supply can be regulated with a throttle valve 24.
- a tank ventilation valve 26 is integrated into the connecting line 12.
- the Tank vent valve 26 is designed as an electromagnetic proportional valve that is controlled by a control signal 28.
- the control signal 28 is from a Engine control unit provided and has a variable duty cycle.
- a cross section of the connecting line 12 becomes corresponding to the duty cycle opened or closed.
- the duty cycle of the control signal 28 is proportional to the opening cross section of the connecting line 12.
- a connection 30 branches from the connecting line 12 to a filter device 32 from.
- the filter device 32 is, for example, an activated carbon container 34 within which a bed of activated carbon 36 is arranged as a filter medium. From one of the Activated carbon 36 downstream collection space 38 leads a connection 40 to the outside.
- a pressure sensor 42 is arranged, by means of which an intake manifold pressure is measured as measured variable 44.
- the general function of the tank ventilation system 10 is as follows:
- a pressure P 1 prevails inside the tank 14.
- a pressure P 2 prevails in the intake manifold 20, while an ambient pressure P 3 is present. If the pressure P 1 in the tank 14 above the ambient pressure P 3 at, via the connecting line 12 and the connection 30 and the filtering means 32 a venting of the tank 14. Here, out fuel vapors through the activated carbon 36 and filtered by this and collected as a filter material . The cleaned air exits via connection 40 to the outside. If there is a negative pressure in the tank 14, that is to say the pressure P 1 is less than the pressure P 3 , air is sucked in via the connection 40, the filter device 32, the connection 30 and the connecting line 12 and transferred to the tank 14. Any filter material from the activated carbon 36 that flows along here is unproblematic since the tank 14 is closed in a pressure-tight manner.
- the tank ventilation valve 26 opens in accordance with the pulse duty factor of the control signal 28. As a result, the pressure P 2 is present at the tank 14 and at the filter device 32. Since there is a negative pressure in the intake manifold 20, the pressure P 2 is lower than the pressure P 1 and the pressure P 3 . Due to this pressure drop, the fuel vapors from the tank 14 and the fuel vapors stored in the activated carbon 36 are sucked in via the opened tank ventilation valve 26 and fed to the combustion air of the internal combustion engine 18. They therefore burn during the combustion process.
- the connecting line 12 is known to be flexible Form line (hose) so that any kinks or the like could also lead to cross-sectional narrowing.
- the method according to the invention for testing the tank ventilation system 10 is explained with reference to FIG. 2.
- the test procedure is initialized (field 52).
- a query 54 is then used to check whether there are release conditions 56 for the test method.
- release conditions 56 include, for example, control processes which run in parallel or diagnostic processes of other devices of the motor vehicle which run in parallel and which could be influenced by the test method 48.
- the release check 56 includes, for example, the query 58 about the current suction pressure P 2 in accordance with the measurement result 44. For example, differences between a maximum and a minimum suction pressure are evaluated.
- a stimulation signal 64 is supplied, which corresponds to the pulse duty factor of the control signal 28.
- a stimulation signal +1 for activated tank ventilation valve 26 and -1 for uncontrolled tank ventilation valve 26 can be delivered.
- a repeat test 68 is triggered by means of a signal 66. The number of measurement cycles carried out is compared with a predeterminable number.
- the repeat test is triggered via signal 70. If the number of measurement cycles carried out is equal to the predetermined number, the diagnosis 74 is carried out via the signal 72. In diagnosis 74, a correlation coefficient of the correlation calculation 62 is checked. If this correlation coefficient has a value of 1, the control signal 28 and the measured variable 44 (intake manifold pressure) are identical in the sense of the correlation calculation. If, on the other hand, the correlation coefficient has a value of 0, there is no relationship between the scanning signal 28 and the measured variable 44, so that an error 76 is recognized. When error 76 is detected, a vehicle driver can be informed, for example by an optical signal, that the tank ventilation system 10 is defective.
- a termination 78 of the method takes place, for example, if the test of the Release condition 56, a signal 80 is generated which indicates the absence of the defined release conditions. Furthermore, during the stimulation of the Control signal 28 or during the acquisition of the measured variable 44 Signal 82 are generated, which also leads to termination 78.
- the signal 82 can be, for example, an error signal if the measured variable 44 is missing or implausible, Expiration of an intended total service life of the tank ventilation valve 26 and / or at Reaching the specified number of measuring cycles to be carried out during the Repeat test 68.
- the test method 48 through reinitialization 52 again starts. If necessary, it can be provided that the test method 48 with each Restart of the internal combustion engine 18 expires.
- another measured variable for example the position of the throttle valve 24 can also be used for the cross-correlation as the measured variable 44.
- a signal can be tapped, for example via a potentiometer, which corresponds to the position of the throttle valve 24.
- the cross correlation can be carried out passively or actively. With the passive Cross-correlation becomes the signals to be evaluated, here the control signal 28 and the measured variable 44, processed uninfluenced. With active cross correlation, the control signals 28 and measured variable 44 entering the cross-correlation Stimulation signals excited so that a sensitivity of the test method 48th can be increased.
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)
- Testing Of Engines (AREA)
Abstract
Description
- Figur 1
- eine schematische Ansicht eines Tankentlüftungssystems und
- Figur 2
- ein Blockschaltbild für die Durchführung eines Verfahrens zum Prüfen des Tankentlüftungssystems.
Claims (7)
- Verfahren zum Prüfen eines Tankentlüftungssystems, insbesondere eines Kraftfahrzeuges, bei dem aus einem Tank entweichende kohlenwasserstoffhaltige flüchtige Gase über eine Filtereinrichtung geführt und in dieser gesammelt werden, und durch eine Beaufschlagung der Filtereinrichtung mit einem Unterdruck das Filtergut über eine Sauganlage einem Verbrennungsprozeß in einer Verbrennungskraftmaschine des Kraftfahrzeuges zugeführt wird, wobei eine Verbindung zwischen der Filtereinrichtung und der Sauganlage durch ein getaktet ansteuerbares Schaltmittel geöffnet beziehungsweise geschlossen wird, dadurch gekennzeichnet, daß ein Ansteuersignal für das Schaltmittel mit einer, einen Zustand der Sauganlage definierenden Meßgröße kreuzkorreliert wird und ein Korrelationskoeffizient als Diagnosesignal des Tankentlüftungssystems ausgewertet wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Meßgröße ein Saugrohrdruck verwendet wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Meßgröße eine Stellung einer Drosselklappe der Sauganlage ausgewertet wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Kreuzkorrelation in einer vorgebbaren Anzahl von Meßzyklen wiederholt wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Prüfung des Tankentlüftungssystems in vorgebbaren Zeitintervallen wiederholt wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Prüfung des Tankentlüftungssystems bei jedem Neustart der Verbrennungskraftmaschine wiederholt wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß vor Durchführung der Kreuzkorrelation Freigabebedingungen für das Prüfverfahren überprüft werden.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19860750 | 1998-12-23 | ||
DE19860750 | 1998-12-23 | ||
DE19908138 | 1999-02-25 | ||
DE19908138A DE19908138B4 (de) | 1998-12-23 | 1999-02-25 | Verfahren zum Prüfen eines Tankentlüftungssystems |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1013917A2 true EP1013917A2 (de) | 2000-06-28 |
EP1013917A3 EP1013917A3 (de) | 2000-11-22 |
EP1013917B1 EP1013917B1 (de) | 2004-02-18 |
Family
ID=26051130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99123162A Expired - Lifetime EP1013917B1 (de) | 1998-12-23 | 1999-11-22 | Verfahren zum Prüfen eines Tankentlüftungssystems |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1013917B1 (de) |
AT (1) | ATE259935T1 (de) |
ES (1) | ES2214799T3 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1179671A2 (de) | 2000-08-07 | 2002-02-13 | Volkswagen Aktiengesellschaft | Verfahren zum Überprüfen eines Kraftstoff-Einspritzsystems |
WO2003033901A1 (de) * | 2001-10-11 | 2003-04-24 | Robert Bosch Gmbh | Verfahren zur überprüfung der funktionsfähigkeit eines tankentlüftungsventils einer tankentlüftungsanlage |
ITBO20120538A1 (it) * | 2012-10-02 | 2014-04-03 | Magneti Marelli Spa | Metodo di diagnosi funzionale di una elettrovalvola canister in un circuito integrato per un motore a combustione interna |
WO2016066937A1 (fr) * | 2014-10-31 | 2016-05-06 | Renault S.A.S. | Procede de diagnostic du fonctionnement de la purge d'un canister |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5140961A (en) * | 1990-01-12 | 1992-08-25 | Nissan Motor Co., Ltd. | System and method for self diagnosing an engine control system |
DE4122975A1 (de) * | 1991-07-11 | 1993-01-14 | Bosch Gmbh Robert | Tankentlueftungsanlage fuer ein kraftfahrzeug sowie verfahren und vorrichtung zum ueberpruefen von deren funktionsfaehigkeit |
US5696317A (en) * | 1996-09-11 | 1997-12-09 | Ford Global Technologies, Inc. | Method for controlling rate of purging of evaporative fuel vapors |
-
1999
- 1999-11-22 ES ES99123162T patent/ES2214799T3/es not_active Expired - Lifetime
- 1999-11-22 AT AT99123162T patent/ATE259935T1/de not_active IP Right Cessation
- 1999-11-22 EP EP99123162A patent/EP1013917B1/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5140961A (en) * | 1990-01-12 | 1992-08-25 | Nissan Motor Co., Ltd. | System and method for self diagnosing an engine control system |
DE4122975A1 (de) * | 1991-07-11 | 1993-01-14 | Bosch Gmbh Robert | Tankentlueftungsanlage fuer ein kraftfahrzeug sowie verfahren und vorrichtung zum ueberpruefen von deren funktionsfaehigkeit |
US5696317A (en) * | 1996-09-11 | 1997-12-09 | Ford Global Technologies, Inc. | Method for controlling rate of purging of evaporative fuel vapors |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1179671A2 (de) | 2000-08-07 | 2002-02-13 | Volkswagen Aktiengesellschaft | Verfahren zum Überprüfen eines Kraftstoff-Einspritzsystems |
EP1179671A3 (de) * | 2000-08-07 | 2005-06-01 | Volkswagen Aktiengesellschaft | Verfahren zum Überprüfen eines Kraftstoff-Einspritzsystems |
WO2003033901A1 (de) * | 2001-10-11 | 2003-04-24 | Robert Bosch Gmbh | Verfahren zur überprüfung der funktionsfähigkeit eines tankentlüftungsventils einer tankentlüftungsanlage |
US7047798B2 (en) | 2001-10-11 | 2006-05-23 | Robert Bosch Gmbh | Method for checking the operativeness of a tank-ventilation valve of a tank-ventilation system |
ITBO20120538A1 (it) * | 2012-10-02 | 2014-04-03 | Magneti Marelli Spa | Metodo di diagnosi funzionale di una elettrovalvola canister in un circuito integrato per un motore a combustione interna |
WO2016066937A1 (fr) * | 2014-10-31 | 2016-05-06 | Renault S.A.S. | Procede de diagnostic du fonctionnement de la purge d'un canister |
FR3027956A1 (fr) * | 2014-10-31 | 2016-05-06 | Renault Sa | Procede de diagnostic du fonctionnement de la purge d'un canister |
KR20170077152A (ko) * | 2014-10-31 | 2017-07-05 | 르노 에스.아.에스. | 캐니스터의 퍼징 동작을 진단하는 방법 |
US10202944B2 (en) | 2014-10-31 | 2019-02-12 | Renault S.A.S. | Method for diagnosing the operation of the purging of a canister |
RU2695244C2 (ru) * | 2014-10-31 | 2019-07-22 | Рено С.А.С. | Способ диагностики работы продувочного вентиля фильтра топливных паров |
Also Published As
Publication number | Publication date |
---|---|
ATE259935T1 (de) | 2004-03-15 |
EP1013917B1 (de) | 2004-02-18 |
EP1013917A3 (de) | 2000-11-22 |
ES2214799T3 (es) | 2004-09-16 |
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