EP0470960B1 - Procede et dispositif de controle de la manoeuvrabilite de la soupape d'aeration d'un reservoir - Google Patents

Procede et dispositif de controle de la manoeuvrabilite de la soupape d'aeration d'un reservoir Download PDF

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Publication number
EP0470960B1
EP0470960B1 EP90903764A EP90903764A EP0470960B1 EP 0470960 B1 EP0470960 B1 EP 0470960B1 EP 90903764 A EP90903764 A EP 90903764A EP 90903764 A EP90903764 A EP 90903764A EP 0470960 B1 EP0470960 B1 EP 0470960B1
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EP
European Patent Office
Prior art keywords
venting valve
tank venting
diagnostic method
tank ventilation
pressure
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
EP90903764A
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German (de)
English (en)
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EP0470960A1 (fr
Inventor
Siegfried Setter
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP0470960A1 publication Critical patent/EP0470960A1/fr
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Publication of EP0470960B1 publication Critical patent/EP0470960B1/fr
Anticipated expiration legal-status Critical
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    • 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
    • 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

Definitions

  • the invention relates to a diagnostic method according to the preamble of claim 1 and a diagnostic device according to the preamble of claim 8.
  • a diagnostic method is already known (DE-PS 36 24 441), in which the controllability of a tank ventilation valve and an idle actuator is checked .
  • the tank ventilation valve is arranged in a feed line that connects an intermediate container, which receives fuel vapors from a fuel tank, to the intake area of an internal combustion engine.
  • the intermediate container usually contains an activated carbon filter, which only allows a certain maximum degree of loading, i. H. can only absorb a maximum amount of fuel in the form of fuel vapors.
  • lambda control Since the control process carried out by the lambda control is normally quite slow, methods have been introduced which redetermine pilot control values for the fuel supply during operation of the internal combustion engine, i. H. learn adaptively (DE-OS 36 39 946). A distinction is made as to whether an existing tank ventilation valve is activated or not, it being assumed that the tank ventilation valve is open or closed depending on the activation.
  • the method according to the invention with the characterizing features of the main claim has the advantage that it works regardless of how much the amount of additional air that can be supplied via the tank ventilation valve is enriched with fuel. That is, that Diagnostic procedures can be used at any time, even if the activated carbon filter and therefore the additional air that can be supplied is heavily loaded with fuel.
  • variables are used for the diagnostic method that change when an air / fuel mixture flows through the tank ventilation valve and can be measured in the area of the tank ventilation valve by sensors intended for this purpose, it is not necessary to evaluate reactions of the internal combustion engine or one of its control devices. This means that their functionality is not a prerequisite for the diagnostic method according to the invention.
  • the basic idea of the present invention is to carry out an actuator diagnosis for the area of the tank ventilation in the operation of a motor vehicle and with the engine running, in which a real physical reaction results, regardless of the air / fuel ratio of the regeneration gas flow of the activated carbon filter.
  • the diagnosis is based on the fact that actuation of the tank ventilation valve directs an additional air quantity through the activated carbon filter to the intake area of the internal combustion engine and that the flow of this air quantity changes quantities which are registered by sensors upstream and downstream of the tank ventilation valve. Corresponding error states can then be identified in this way.
  • FIG. 1 which is based on discrete switching stages, does not limit the invention, but in particular serves to illustrate the basic functional effects of the invention and special functional sequences in one possible way Specify the form of implementation. It is understood that the individual blocks and blocks can be constructed using analog, digital or hybrid technology. Furthermore, it is also possible that they can be combined in whole or in part, corresponding areas of program-controlled digital systems, for example microcomputers, microprocessors, digital or analog logic circuits and the like.
  • an internal combustion engine is designated by 10 and its intake area by 11, in which a throttle valve 11a is rotatably arranged. A deflection from the rest position is indicated by the angle ⁇ .
  • the other components that ensure the operation of the internal combustion engine are dealt with only to the extent necessary for understanding the present invention and for the basic relationships.
  • the electronic control unit 12 creates an output signal calculated with high accuracy, in the case of a fuel injection system, for example, an injection control command ti for actuating injection valves symbolically represented by 17 in the intake area.
  • a control unit 18 which is drawn separately for reasons of clarity, is also provided for the tank ventilation, but can also be part of the central microcomputer and which controls the tank ventilation valve 19. This is arranged in a line which leads from an intermediate container 20, which receives vapors from a fuel tank 21, to the intake area 11 of the internal combustion engine at point 22.
  • the sensors 24 and 25 are designed such that they detect quantities that change when an air / fuel mixture flows through the tank ventilation valve 19.
  • the diagnostic block 23 can also receive a signal from the electronic control unit 12, which only allows the diagnostic method to be carried out.
  • a signal relating to the load L can also be supplied to the diagnostic block 23 by the air flow meter 13, in particular if the latter is designed as a pressure meter.
  • the diagnostic block 23 also as part of the microcomputer or of its programming, comprises memories in which the measured values of the sensors 24 and 25 and results of the diagnosis can be stored, and comparison means which can carry out the necessary comparisons of the measurement signals.
  • a display device 26 can also be actuated by the diagnostic block 23, which, depending on the result of the diagnosis, lights up indicator lamps, for example. It goes without saying that this display can in principle be implemented in any form, including as a letter display, and can also display intermediate values of the diagnosis.
  • a negative pressure is generated in the intake area 11, ie a pressure pA that is less than Is atmospheric pressure and which depends on operating parameters, such as the speed n and the deflection ⁇ of the throttle valve 11a.
  • the sensors 24 and 25 are designed such that they measure the pressure in the inlet and outlet line of the tank ventilation valve 19. The sequence of the diagnostic procedure is explained with the aid of FIG. 2.
  • step 100 such operating parameters are measured on which the pressure in the intake area 11 depends (step 100), such as the rotational speed n and the angle of attack ⁇ of the throttle valve 11a.
  • the pressure pA in the intake area 11 of the internal combustion engine 10 is calculated in step 101.
  • Step 100 can also be designed such that the pressure pA in the suction area 11 is detected by a sensor provided for this purpose; the signal it emits can also be used as a measure of the load state of the internal combustion engine.
  • step 102 pA is compared with a maximum permissible pressure pAMAX, which is at most permissible in order to be able to measure a pressure change after activation of the tank ventilation valve 19 by the sensors 24 and 25. If pA is greater than pAMAX, the diagnostic procedure is aborted (103). If, however, pA is less than or equal to pAMAX, the pressures p124 and p125 are measured in step 104 by the sensors 24 and 25, respectively. These values are stored in step 105, and then a control signal AS is sent by the diagnostic block 23 to the tank ventilation control unit 18 submitted (106).
  • pAMAX a maximum permissible pressure pAMAX
  • step 107 pressures p224 and p225 are measured again by sensors 24 and 25, respectively.
  • step 109 the pressure differences from at least one of the equations (1) to (3) are compared with target values. If one or more of these differences are smaller than the associated target values DMIN, an error state is determined in step 111. A multitude of minimum values with respect to equations (1) - (3) are thus designated here by DMIN.
  • tank ventilation valve 19 can be activated (110), which can be referred to here as a “good condition”.
  • the results of the diagnosis (103, 110, 111) can be stored in the memory provided for this purpose, which is part of the diagnosis block 23 and / or can be displayed by the display device 26.
  • the sensors 24, 25 are designed such that they measure a mass flow rate Q, usually of an air / fuel mixture, flowing through the inlet or outlet line of the tank ventilation valve.
  • sensors 24 and 25 measure the mass flow in the inlet and outlet line of the tank ventilation valve 19 and store the associated values Q124 and Q125 (Step 204).
  • step 109a If the query at step 109a shows that differences are greater than or equal to DMIN, this means that the tank ventilation valve can be actuated, but the tank ventilation system is leaking. This leak means that the air / fuel mixture gets outside the tank ventilation system or that the tank ventilation valve was not completely closed before actuation.
  • An exact diagnosis which will not be discussed further, can be obtained in step 210 through a selective evaluation of the output signals of the sensors 24, 25.
  • step 109 the question is asked in step 109 as to whether differences from equations (4) and (5) are smaller than the minimum target values DMIN. If "yes", the tank ventilation valve cannot be activated and is closed before and after activation by the diagnostic block 23 (111).
  • step 109 If the query at step 109 is "no", this means that the tank ventilation system is tight in the area which the sensors 24, 25 detect and that the tank ventilation valve can be activated.
  • DMIN denotes minimum values with respect to equations (4) and (5).
  • the possible results of the diagnostic method (103, 110, 111, 210, 211) can be stored in the memory provided for this purpose, which is part of the diagnostic block 23 and / or can be displayed by the display device (26).
  • a possible variation of the second embodiment which will not be discussed further, uses sensors 24, 25 in such a way that volume flows are measured instead of mass flows.
  • a third version of the diagnostic method uses a single 27 (FIG. 1b) instead of the two sensors 24, 25, which outputs an output signal to the diagnostic block 23, which is a measure of the differential pressure between the outgoing and the supply line of the tank ventilation valve 19.
  • the process this version of the diagnostic method is explained with the aid of FIG. 4. Steps which proceed as in the first version of the diagnostic method are designated as in FIG. 2. These are only dealt with to the extent necessary for understanding.
  • step 304 After a pressure pA that is less than or equal to PMAX was determined in step 102, a measurement of the differential pressure p127 between the discharge and the supply line of the tank ventilation valve 19 follows in step 304. The value of this measurement is stored in step 305 and then (106 ) a control signal AS for the tank ventilation valve is emitted to the tank ventilation control unit 18 by the diagnostic block 23.
  • step 307 the differential pressure is measured again, which gives the value p227.
  • the diagnostic method concludes that there is a fault in the control chain of the tank ventilation valve (111), otherwise (“no") the tank ventilation valve has responded to the control signal and a "good condition” is registered (110).
  • the results from 110 or 111 can then be displayed and / or saved.
  • the method according to the invention has the particular advantage that it works independently of engine reactions and therefore does not require any restriction of the air / fuel ratio of the flow rate.

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  • 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)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Un procédé permet de contrôler la manoeuvrabilité d'une soupape d'aération d'un réservoir à travers laquelle une quantité supplémentaire d'air chargé de vapeurs de carburant peut être introduite dans la zone d'aspiration d'un moteur à combustion interne. Afin de mettre en ÷uvre ce procédé, on mesure, dans la zone de la soupape d'aération du réservoir, des valeurs qui varient lorsqu'un certain débit s'écoule à travers celle-ci. On évalue de préférence des différences entre ces valeurs avant et après la commande de la soupape d'aération du réservoir. En cas de besoin, par exemple lorsque la sensibilité des capteurs utilisés le requiert, le contrôle peut dépendre de la pression dans la zone d'aspiration.

Claims (8)

  1. Procédé de diagnostic pour contrôler la manoeuvrabilité d'une soupape d'aération de réservoir par laquelle on peut faire passer une quantité additionnelle d'air chargée de vapeurs de carburant à la zone d'aspiration d'un moteur à combustion interne, procédé de diagnostic caractérisé en ce que :
    - on utilise comme signaux de mesure des signaux de sortie d'au moins un détecteur qui détecte des grandeurs que l'on peut mesurer dans la conduite d'arrivée et/ou de sortie de la soupape d'aération de réservoir, et qui varient quand la quantité additionnelle d'air s'écoule à travers la soupape d'aération de réservoir,
    - et en fonction d'au moins l'un de ces signaux de mesure, dans le cas d'un signal de commande donné AS pour une chaîne de commande associée à la soupape d'aération de réservoir, on conclut à la manoeuvrabilité de la soupape d'aération de réservoir et/ou à l'étanchéité de la conduite d'entrée et/ou de sortie de la soupape d'aération de réservoir,
    - et l'on vérifie avant l'exploitation des signaux de mesure si la pression pA existant dans la zone d'aspiration du moteur à combustion interne se trouve en-dessous d'une valeur maximale autorisée et si une exploitation subsiste dans le cas d'une pression pA au-dessus de la valeur maximale.
  2. Procédé de diagnostic selon la revendication 1, caractérisé en ce qu'en plus d'au moins un signal de mesure dans le cas d'un signal de commande donné AS, on exploite au moins un signal de mesure avant la délivrance du signal de commande AS.
  3. Procédé de diagnostic selon la revendication 2, caractérisé en ce qu'on exploite au moins une différence des signaux de mesure avant délivrance et dans le cas d'un signal de commande AS donné.
  4. Procédé de diagnostic selon la revendication 1, caractérisé en ce que la pression pA est calculée par des grandeurs caractéristiques de fonctionnement du moteur à combustion interne, soit au moins la vitesse de rotation et la charge.
  5. Procédé de diagnostic selon l'une des revendications 1 à 4, caractérisé en ce que les grandeurs détectables représentent les pressions dans la conduite d'entrée et/ou de sortie de la soupape d'aération de réservoir.
  6. Procédé de diagnostic selon l'une des revendications 1 à 4, caractérisé en ce que les grandeurs détectables représentent des débits dans la conduite d'entrée et/ou de sortie de la soupape d'aération de réservoir.
  7. Procédé de diagnostic selon l'une des revendications 1 à 4, caractérisé en ce que les grandeurs détectables représentent des pressions différentielles entre la conduite d'entrée et de sortie de la soupape d'aération de réservoir.
  8. Dispositif pour la mise en oeuvre d'un procédé de diagnostic selon l'une des revendications 1 à 7 pour contrôler la manoeuvrabilité d'une soupape d'aération de réservoir au moyen de laquelle on peut amener une quantité d'air additionnelle chargée de vapeurs de carburant, à la zone d'aspiration d'un moteur à combustion interne, et qui présente des moyens pouvant délivrer les signaux de commande (AS) à la chaîne de commande associée à la soupape d'aération de réservoir, et comprenant des moyens pour afficher et/ou mettre en mémoire les résultats du procédé de diagnostic, dispositif caractérisé en ce que des moyens sont en outre prévus qui
    - mesurent la pression pA existant dans la zone d'aspiration du moteur à combustion interne en calculant à partir de grandeurs mesurées, en comparant avec une valeur de seuil et en n'autorisant un diagnostic que si la pression pA se trouve en-dessous de cette valeur de seuil,
    - comportent au moins un détecteur qui détecte des grandeurs dans la conduite d'entrée et/ou de sortie de la soupape d'aération de réservoir, grandeurs qui varient quand le débit d'air additionnel s'écoule à travers la soupape d'aération de réservoir, et
    - mettent en mémoire les valeurs des signaux de sortie des détecteurs et les comparent à des valeurs prédéfinies en permettant de cette façon de conclure à l'efficacité du fonctionnement de la chaîne de commande de la soupape d'aération de réservoir.
EP90903764A 1989-03-25 1990-02-27 Procede et dispositif de controle de la manoeuvrabilite de la soupape d'aeration d'un reservoir Expired - Lifetime EP0470960B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3909887A DE3909887A1 (de) 1989-03-25 1989-03-25 Verfahren und vorrichtung zur ueberpruefung der steuerbarkeit eines tankentlueftungsventils
DE3909887 1989-03-25

Publications (2)

Publication Number Publication Date
EP0470960A1 EP0470960A1 (fr) 1992-02-19
EP0470960B1 true EP0470960B1 (fr) 1994-01-19

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EP90903764A Expired - Lifetime EP0470960B1 (fr) 1989-03-25 1990-02-27 Procede et dispositif de controle de la manoeuvrabilite de la soupape d'aeration d'un reservoir

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Country Link
US (1) US5182945A (fr)
EP (1) EP0470960B1 (fr)
JP (1) JP2866477B2 (fr)
KR (1) KR0137011B1 (fr)
BR (1) BR9007250A (fr)
DE (2) DE3909887A1 (fr)
ES (1) ES2049467T3 (fr)
WO (1) WO1990011443A1 (fr)

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Also Published As

Publication number Publication date
JP2866477B2 (ja) 1999-03-08
EP0470960A1 (fr) 1992-02-19
DE3909887A1 (de) 1990-09-27
KR920701650A (ko) 1992-08-12
BR9007250A (pt) 1991-11-26
ES2049467T3 (es) 1994-04-16
US5182945A (en) 1993-02-02
WO1990011443A1 (fr) 1990-10-04
JPH04503844A (ja) 1992-07-09
DE59004357D1 (de) 1994-03-03
KR0137011B1 (en) 1998-04-25

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