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WO2007071483A1 - Procede pour controler l'etancheite d'un systeme de reservoir d'un vehicule - Google Patents

Procede pour controler l'etancheite d'un systeme de reservoir d'un vehicule Download PDF

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Publication number
WO2007071483A1
WO2007071483A1 PCT/EP2006/067904 EP2006067904W WO2007071483A1 WO 2007071483 A1 WO2007071483 A1 WO 2007071483A1 EP 2006067904 W EP2006067904 W EP 2006067904W WO 2007071483 A1 WO2007071483 A1 WO 2007071483A1
Authority
WO
WIPO (PCT)
Prior art keywords
measured variable
variable
tank system
measured
stability
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.)
Ceased
Application number
PCT/EP2006/067904
Other languages
German (de)
English (en)
Inventor
Silke Brosi
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2007071483A1 publication Critical patent/WO2007071483A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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 is based on a method for leak testing a tank system of a vehicle according to the preamble of claim 1.
  • the measured variable has not reached the reference value at the end of the time interval or if the measured variable no longer appreciably rises after the time interval has expired, its gradient is therefore too small, an overpressure is generated until a predetermined end time has been reached.
  • the end time is selected depending on the tank level.
  • the measured quantity recorded at the end time is saved.
  • a new reference variable is again recorded in a reference measurement and compared with the stored measured variable. If the stored measured variable is greater than or equal to the new reference size, it is detected that the tank system is leaktight; in the other case, it detects a leak in the tank system. Disclosure of the invention
  • the inventive method for leak testing of a tank system of a vehicle having the features of claim 1 has the advantage that, unlike the known method described above, it is independent of the current level of the tank and thus no diagnosis of the tank level signal is required. With the elimination of the tank level signal diagnosis, the accuracy requirements for the level sensor are reduced as it is only required to display the level in the on-board system of the vehicle.
  • the fill level independence of the method according to the invention is based on the fact that the comparison value for the measured variable is larger than that by a default value, a so-called offset
  • a positive or negative pressure in the tank system must be generated, which is greater than the negative or negative pressure in the reference measurement and in case of a leak in the tank system, which is equal to or greater than the reference leak can not be achieved in the tank system.
  • the tank level does affect the size of the measurement time, but not the diagnostic result.
  • a measuring time adapted to the minimum filling level of the tank provides a reliable statement about the tightness of the tank system at every tank level.
  • the measured variable in the case that the measured variable is greater than the reference value increased by a reference value, recognized for leaks of the tank system and in the case that the measured variable is smaller, the measured variable subjected to further test criteria.
  • environmental influences are compensated during diagnosis, which can simulate a possible leak by reducing the pressure build-up in the tank system, although such is not present.
  • environmental influences are fuel condensation effects, a drift of the measured variables at ambient humidity, etc.
  • a check of the stability of the measured variable is carried out as a further test criterion for the smaller measured variable compared to the reference value increased by the reference value.
  • This stability check of the measured variable shortens the diagnosis time, which is advantageous since the diagnosis is carried out in the after-run, ie immediately after the vehicle engine has been switched off. If the stability of the measured variable is affirmative, a new reference measurement is carried out with which a second reference variable is detected. The previously stored measured variable is compared with the second reference variable, which in turn is increased by the default value, the so-called offset, and finally recognized as a leak in the tank system, when the measured variable is smaller than the reference variable increased by the offset. If the measured value does not stabilize, then, in order to save measurement time, as a further test criterion according to a further embodiment of the invention, the gradient of
  • Measured variable checked because, in the event of a leak in the tank system, the measured variable may, after a relatively long time, also reach the reference value increased by the preset value, but its gradient, i. their increase per unit time, much lower, so that even the too small gradient of the measured variable is an indication of a leak. If the gradient is not large enough or too small, the process of re-reference measurement and test described above is carried out identically. Alternatively, it is possible to apply the test criteria stability and gradient of the measured variable not successively but in parallel, i. to carry out the test criterion Gradient independently of the result of the stability test.
  • the drawing shows a flow chart illustrating the method for leak testing a tank system.
  • a tank system with a diagnostic module for detecting a tank leak is described in DE 100 06 186 C1 or in DE 196 36 431 Al and each sketched in Fig. 1, so that reference is made to this extent.
  • the diagnostic module comprises a working as a pressure pump, electrically driven air pump, a switching valve that connects the pressure outlet of the air pump in its one switching position to a reference leak predetermined size having branch channel and in its other switching position on the tank system.
  • the switching valve and the air pump are controlled by a switching device.
  • the current consumption of the air pump is recorded as an operating parameter and evaluated in an evaluation unit for tank leak diagnosis.
  • other operating parameters of the air source representing a pressure source can be used, such as the speed of the air pump or the voltage applied to the air pump.
  • tank leak diagnosis module With this so-called tank leak diagnosis module, the tightness test of the tank system is performed according to the method described below, which is illustrated in a flow chart in the drawing.
  • a reference measurement is performed, including the switching valve such
  • Switching position assumes that the switched air pump generates an overpressure at the reference leak.
  • a pump current that is substantially constant in time that is, the motor current of the air pump
  • the changeover valve is switched, so that now the pressure outlet of the air pump is connected to the tank system and generates an overpressure in the tank system.
  • the tank measurement specified in the flow chart starts, in which the pump current is detected as a measured variable over the pump or measuring period.
  • the pump current is referred to as a measured variable in accordance with the flowchart of the drawing.
  • the stored reference variable which represents the current level reached during the reference measurement, and the measured variable continuously acquired during the tank measurement are evaluated for the diagnosis of the tank system in such a way that the measured variable is compared with the reference variable increased by a default value, referred to below ,
  • the offset is determined empirically and is permanently stored in the evaluation unit. If the comparison of the measured variable with the reference variable increased by the offset indicates that the measured variable is greater, the tightness of the tank system is recognized. If the comparison shows that the measured variable is smaller than the reference variable plus offset, the measured variable is subjected to further test criteria described below.
  • a test criterion is the stability of the measured variable and another test criterion is the gradient of the measured variable, ie its temporal change.
  • the stability of the measured variable is defined as a change in the measured variable over a given time interval that is less than a predefined amount of change. For example, the amount of change is set at 0.1mA. If the test shows that the measured variable fulfills the stability criterion, the measured variable is stored, and a second reference measurement is initiated by switching over the reversing valve.
  • the test for stability of the measured variable is preferably carried out twice in succession after a short minimum time of tank measurement.
  • the minimum pumping time, after which the stability of the measured variable is checked is 100% by way of example, whereby it is taken into account that after the immediate shutdown of the Motors of the motor vehicle, still disturbances such as light off, window closing, etc., may arise, which cause a corruption of the pump current.
  • the test of stability results in an instability of the measured variable
  • the test criterion of the gradient of the measured variable is used. The gradient is determined at a value of the measured variable, which is significantly above the minimum of the measured variable. This minimum occurs immediately after the initiation of the
  • the gradient of the measured variable is compared with a gradient preset value. If the gradient is smaller than the gradient preset value, the second reference measurement is in turn initiated by switching over the changeover valve. However, if the gradient of the measured variable is greater than the gradient preset value, the above-described comparison of the measured variable with the reference variable increased by the offset is repeated.
  • the test criterion of the gradient of the measured variable can be introduced not only depending on the test result of the stability of the measured variable, but be performed in parallel to the test of stability. This is illustrated in the flowchart by the additionally drawn, dashed flow line.
  • the air pump again generates an overpressure at the reference leak, which after a certain pumping time of the air pump leads to a nearly constant second reference variable.
  • the measured variable stored at the initiation of the second reference measurement is now compared with the second reference variable, which is enlarged by the same offset as the first reference variable. If the measured value is greater than the second reference value plus offset, the tightness of the
  • Tank system detected the measured size is smaller than the second reference size plus offset, so a leak is diagnosed in the tank system, which has at least the size of the reference leak.
  • the reference leak is specified, for example, with a clear diameter of 0.5 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

L'invention concerne un procédé pour contrôler l'étanchéité d'un système de réservoir d'un véhicule. Ce procédé consiste d'une part à générer sur une fuite de référence une pression différente de la pression atmosphérique pendant une durée prédéterminée au moyen d'une source de pression et à déterminer ainsi un paramètre de fonctionnement de la source de pression en tant que grandeur de référence et, d'autre part, à générer dans le système de réservoir une pression différente de la pression atmosphérique et à déterminer ainsi le même paramètre de fonctionnement de la source de pression en tant que grandeur de mesure. Selon l'invention, pour qu'il ne soit pas nécessaire de prendre en considération le niveau de remplissage actuel du réservoir lors du diagnostic, la grandeur de mesure est comparée avec la grandeur de référence augmentée d'une valeur de consigne. Si la grandeur de mesure est supérieure à cette grandeur de référence, le système de réservoir est considéré étanche et si la grandeur de mesure est inférieure à la grandeur de référence, ladite grandeur de mesure est soumise à d'autres critères de contrôle.
PCT/EP2006/067904 2005-12-20 2006-10-30 Procede pour controler l'etancheite d'un systeme de reservoir d'un vehicule Ceased WO2007071483A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005060905.8 2005-12-20
DE200510060905 DE102005060905A1 (de) 2005-12-20 2005-12-20 Verfahren zur Dichtheitsprüfung eines Tanksystems eines Fahrzeugs

Publications (1)

Publication Number Publication Date
WO2007071483A1 true WO2007071483A1 (fr) 2007-06-28

Family

ID=37663364

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/067904 Ceased WO2007071483A1 (fr) 2005-12-20 2006-10-30 Procede pour controler l'etancheite d'un systeme de reservoir d'un vehicule

Country Status (2)

Country Link
DE (1) DE102005060905A1 (fr)
WO (1) WO2007071483A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114893329A (zh) * 2022-06-08 2022-08-12 中国第一汽车股份有限公司 一种燃油蒸发系统泄漏诊断方法及车辆

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6119663A (en) * 1998-03-31 2000-09-19 Unisia Jecs Corporation Method and apparatus for diagnosing leakage of fuel vapor treatment unit
DE10006186C1 (de) * 2000-02-11 2001-06-13 Bosch Gmbh Robert Verfahren zur Dichtheitsprüfung eines Tanksystems eines Fahrzeugs
US6389882B1 (en) * 1999-06-30 2002-05-21 Unisia Jecs Corporation Apparatus and method for diagnosing leakage in fuel vapor treatment apparatus
US20030131655A1 (en) * 2002-01-11 2003-07-17 Toyota Jidosha Kabushiki Kaisha Apparatus and method for failure diagnosis of fuel vapor purge system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6119663A (en) * 1998-03-31 2000-09-19 Unisia Jecs Corporation Method and apparatus for diagnosing leakage of fuel vapor treatment unit
US6389882B1 (en) * 1999-06-30 2002-05-21 Unisia Jecs Corporation Apparatus and method for diagnosing leakage in fuel vapor treatment apparatus
DE10006186C1 (de) * 2000-02-11 2001-06-13 Bosch Gmbh Robert Verfahren zur Dichtheitsprüfung eines Tanksystems eines Fahrzeugs
US20030131655A1 (en) * 2002-01-11 2003-07-17 Toyota Jidosha Kabushiki Kaisha Apparatus and method for failure diagnosis of fuel vapor purge system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114893329A (zh) * 2022-06-08 2022-08-12 中国第一汽车股份有限公司 一种燃油蒸发系统泄漏诊断方法及车辆

Also Published As

Publication number Publication date
DE102005060905A1 (de) 2007-06-28

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