EP1013917A2 - Procédé de controle pour système de purge de réservoir - Google Patents

Procédé de controle pour système de purge de réservoir Download PDF

Info

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
Application number
EP99123162A
Other languages
German (de)
English (en)
Other versions
EP1013917A3 (fr
EP1013917B1 (fr
Inventor
Jens Dr. Drückhammer
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.)
Volkswagen AG
Original Assignee
Volkswagen 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
Priority claimed from DE19908138A external-priority patent/DE19908138B4/de
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP1013917A2 publication Critical patent/EP1013917A2/fr
Publication of EP1013917A3 publication Critical patent/EP1013917A3/fr
Application granted granted Critical
Publication of EP1013917B1 publication Critical patent/EP1013917B1/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
    • 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)
EP99123162A 1998-12-23 1999-11-22 Procédé de controle pour système de purge de réservoir Expired - Lifetime EP1013917B1 (fr)

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 (fr) 2000-06-28
EP1013917A3 EP1013917A3 (fr) 2000-11-22
EP1013917B1 EP1013917B1 (fr) 2004-02-18

Family

ID=26051130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99123162A Expired - Lifetime EP1013917B1 (fr) 1998-12-23 1999-11-22 Procédé de controle pour système de purge de réservoir

Country Status (3)

Country Link
EP (1) EP1013917B1 (fr)
AT (1) ATE259935T1 (fr)
ES (1) ES2214799T3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1179671A2 (fr) 2000-08-07 2002-02-13 Volkswagen Aktiengesellschaft Méthode pour tester un système d' injection de carburant
WO2003033901A1 (fr) * 2001-10-11 2003-04-24 Robert Bosch Gmbh Procede de surveillance du bon fonctionnement d'une soupape d'evacuation d'air d'un systeme d'evacuation d'air de reservoir
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
FR3027956A1 (fr) * 2014-10-31 2016-05-06 Renault Sa Procede de diagnostic du fonctionnement de la purge d'un canister

Citations (3)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1179671A2 (fr) 2000-08-07 2002-02-13 Volkswagen Aktiengesellschaft Méthode pour tester un système d' injection de carburant
EP1179671A3 (fr) * 2000-08-07 2005-06-01 Volkswagen Aktiengesellschaft Méthode pour tester un système d' injection de carburant
WO2003033901A1 (fr) * 2001-10-11 2003-04-24 Robert Bosch Gmbh Procede de surveillance du bon fonctionnement d'une soupape d'evacuation d'air d'un systeme d'evacuation d'air de reservoir
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
FR3027956A1 (fr) * 2014-10-31 2016-05-06 Renault Sa Procede de diagnostic du fonctionnement de la purge d'un canister
WO2016066937A1 (fr) * 2014-10-31 2016-05-06 Renault S.A.S. 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
ES2214799T3 (es) 2004-09-16
EP1013917A3 (fr) 2000-11-22
EP1013917B1 (fr) 2004-02-18
ATE259935T1 (de) 2004-03-15

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