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EP1013917B1 - 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
EP1013917B1
EP1013917B1 EP99123162A EP99123162A EP1013917B1 EP 1013917 B1 EP1013917 B1 EP 1013917B1 EP 99123162 A EP99123162 A EP 99123162A EP 99123162 A EP99123162 A EP 99123162A EP 1013917 B1 EP1013917 B1 EP 1013917B1
Authority
EP
European Patent Office
Prior art keywords
tank
cross
correlation
filter device
testing
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
EP99123162A
Other languages
German (de)
English (en)
Other versions
EP1013917A2 (fr
EP1013917A3 (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 the mentioned in the preamble of claim 1 Features.
  • a pressure compensation This will be in volatile hydrocarbon gases present in the tank through the filter medium (Activated carbon) retained as filter material. If there is a negative pressure in the tank, this is done Pressure equalization also via the filter device.
  • a rinse of the filter device To remove the filter material takes place through the opening of the switching means. hereby the filter device by the in the intake system of the motor vehicle subjected to prevailing negative pressure, so that the filter material on the open Switching means is guided in the intake and the combustion air of the Internal combustion engine is supplied.
  • DE-A-4 122 975 shows a tank ventilation system for a motor vehicle and a method and a Device for checking their functionality.
  • the invention has for its object to provide a method of the generic type create, with the simple way a review of a tank ventilation system is possible.
  • this object is achieved by a method with the in claim 1 solved mentioned features.
  • correlation method for determining the similarity of two curves, here the drive signal and the the suction system defining measured value, are reliable and easy to handling procedures known.
  • DE-A-4 122 975 shows e.g. such a procedure.
  • FIG. 1 shows a tank ventilation system 10.
  • the tank ventilation system 10 comprises a tank ventilation system 10 Connecting line 12, a tank 14 with an intake 16 of a Combustion engine 18 connects.
  • the suction system 16 has a suction tube 20, so that by means of negative pressure from a source 22 combustion air can be sucked.
  • the Combustion air supply is adjustable with a throttle valve 24.
  • a tank vent valve 26 is integrated in the connecting line 12.
  • the Tank vent valve 26 is designed as an electromagnetic proportional valve, the is driven by a drive signal 28.
  • the drive signal 28 is from a Motor control unit provided and has a variable duty cycle. According to the duty cycle becomes a cross section of the connecting line 12th opened or closed.
  • the duty cycle of the drive signal 28 is proportional to the opening cross-section of the connecting line 12th
  • connection 30 branches to a filter device 32 from.
  • the filter device 32 is, for example, an activated carbon container 34, within the a bed of activated carbon 36 is arranged as a filter means. From one of the Activated carbon 36 downstream collecting space 38 performs a connection 40 to the outside.
  • a pressure sensor 42 is arranged, by means of which a Saugrohrdruck is measured as measured variable 44.
  • the general function of the tank venting system 10 is as follows:
  • a pressure P 1 Within the tank 14 there is a pressure P 1 .
  • a pressure P 2 In the intake manifold 20 there is a pressure P 2 , while an ambient pressure P 3 is present. If the pressure P 1 in the tank 14 rises above the ambient pressure P 3 , venting of the tank 14 takes place via the connecting line 12 and the connection 30 and the filter device 32. Fuel vapors are passed over the activated carbon 36 and filtered by the same and collected as filter material , The cleaned air exits via the connection 40 to the outside. If a negative pressure prevails in the tank 14, that is to say the pressure P 1 is less than the pressure P 3 , the filter device 32, the connection 30 and the connecting line 12 are sucked in air via the connection 40 and transferred into the tank 14. This possibly entrained filter material from the activated carbon 36 is not a problem, since the tank 14 is sealed pressure-tight.
  • the tank venting valve 26 opens according to the duty ratio of the drive signal 28. As a result, the pressure P 2 is applied to the tank 14 and to the filter device 32. Since a negative pressure prevails in the intake manifold 20, the pressure P 2 is less than the pressure P 1 and the pressure P 3 . As a result of this pressure gradient, the fuel vapors from the tank 14 and the fuel vapors stored in the activated carbon 36 are sucked in via the opened tank-venting valve 26 and supplied to the combustion air of the internal combustion engine 18. These thus burn during the combustion process.
  • the tank venting valve 26 To a safe venting of the tank 14 and cleaning of the filter device 32 to ensure the function of the tank vent valve 26 must be checked. Possible errors of the tank venting valve 26 could, for example, a clamping Be valve member, so that the tank vent valve 26 either no longer opens or no longer closes. Furthermore, dirt could in the connecting line 12th be deposited, which lead to cross-sectional constrictions and thus the function affect. In addition, it is known that the connecting line 12 as flexible Form line (hose) so that any kinks or the like could also lead to cross-sectional constrictions.
  • hose flexible Form line
  • the method according to the invention for testing the tank ventilation system 10 will be explained with reference to FIG.
  • the test procedure is initialized (field 52).
  • it is checked via a query 54 whether release conditions 56 are given for the test method.
  • release conditions 56 include, for example, parallel-running control actions or parallel-running diagnostic procedures of other devices of the motor vehicle that could be affected by the test method 48.
  • the release check 56 includes, for example, the query 58 about the current suction pressure P 2 according to 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 duty cycle of the drive signal 28.
  • a stimulation signal +1 for actuated tank venting valve 26 and of -1 for not activated tank venting valve 26 can be supplied.
  • a repeat check 68 is triggered by means of a signal 66.
  • the number of measuring cycles performed is compared with a predetermined number.
  • the repeat check is triggered via the signal 70. If the number of measuring cycles carried out is equal to the predetermined number, the diagnosis 74 is carried out via the signal 72. In the diagnosis 74, a correlation coefficient of the correlation calculation 62 performed is checked. If this correlation coefficient has a value of 1, the drive 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 correlation between the sampling signal 28 and the measured variable 44, so that an error 76 is detected. Upon detection of the error 76, for example, a driver can be given an information by an optical signal that the tank ventilation system 10 is faulty.
  • An abort 78 of the process takes place, for example, when the examination of the Release condition 56 a signal 80 is generated, which is the absence of the defined release conditions includes. Furthermore, during stimulation of the Control signal 28 or during the detection of the measured variable 44 a Signal 82 are generated, which also leads to abort 78.
  • the signal 82 can be an error signal, for example, if the measured variable 44 is missing or implausible, Expiration of a planned total service life of the tank venting valve 26 and / or at Reaching the predetermined number of measuring cycles to be performed during the Repeat test 68.
  • a Timers are started, the test method 48 by reinitialization 52 again starts.
  • the test method 48 with each Restart of the internal combustion engine 18 is running.
  • a signal for example via a potentiometer, can be tapped, which corresponds to the position of the throttle valve 24.
  • Cross-correlation can be passive or active. At the passive Cross correlation are the signals to be evaluated, here the drive signal 28 and the measurand 44, processed unaffected. In active cross correlation, the in the cross-correlation incoming control signals 28 and 44 measured Stimulation signals stimulated, so that a sensitivity of the test method 48 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)

Claims (7)

  1. Procédé pour le contrôle d'un système de purge de réservoir (10), en particulier d'un véhicule automobile, selon lequel des gaz volatiles hydrocarburés et s'échappant d'un réservoir (14) sont guidés par un système de filtrage (32) et collectés dans celui-ci, et le produit à filtrer (36) est amené par une installation d'aspiration (16) à un processus de combustion dans une machine à combustion interne (18) du véhicule automobile sous l'effet d'une alimentation du système de filtrage (32) avec une dépression, une liaison entre le système de filtrage (32) et l'installation d'aspiration (16) étant ouverte ou fermée par un moyen de commutation (26) pouvant être commandé par cycle, caractérisé en ce qu'un signal d'amorçage (28) pour le moyen de commutation est corrélé de façon croisée avec une grandeur de mesure définissant un état de l'installation d'aspiration (16) et un coefficient de corrélation est analysé comme signal de diagnostic du système de purge de réservoir (10).
  2. Procédé selon la revendication 1, caractérisé en ce qu'une pression de tuyau d'aspiration est utilisée comme grandeur de mesure.
  3. Procédé selon la revendication 1, caractérisé en ce qu'une position d'un clapet d'étranglement (24) de l'installation d'aspiration est analysée comme grandeur de mesure.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la corrélation croisée est répétée dans un nombre prédéfinissable de cycles de mesure.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le contrôle du système de purge de réservoir (10) est répété à des intervalles de temps prédéfinissables.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le contrôle du système de purge de réservoir (10) est répété lors de chaque redémarrage de la machine à combustion interne.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que des conditions d'autorisation pour la procédure de contrôle sont répétées avant l'exécution de la corrélation croisée.
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
DE19908138A DE19908138B4 (de) 1998-12-23 1999-02-25 Verfahren zum Prüfen eines Tankentlüftungssystems
DE19908138 1999-02-25

Publications (3)

Publication Number Publication Date
EP1013917A2 EP1013917A2 (fr) 2000-06-28
EP1013917A3 EP1013917A3 (fr) 2000-11-22
EP1013917B1 true 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)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10038444B4 (de) 2000-08-07 2014-07-31 Volkswagen Ag Verfahren zum Überprüfen eines Kraftstoff-Einspritzsystems
DE10150420A1 (de) 2001-10-11 2003-04-30 Bosch Gmbh Robert 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
FR3027956B1 (fr) * 2014-10-31 2016-11-04 Renault Sa Procede de diagnostic du fonctionnement de la purge d'un canister

Family Cites Families (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

Also Published As

Publication number Publication date
ATE259935T1 (de) 2004-03-15
EP1013917A2 (fr) 2000-06-28
EP1013917A3 (fr) 2000-11-22
ES2214799T3 (es) 2004-09-16

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