EP3642473B1 - Dispositif de détection de l'état d'un injecteur - Google Patents

Dispositif de détection de l'état d'un injecteur Download PDF

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Publication number
EP3642473B1
EP3642473B1 EP18743508.6A EP18743508A EP3642473B1 EP 3642473 B1 EP3642473 B1 EP 3642473B1 EP 18743508 A EP18743508 A EP 18743508A EP 3642473 B1 EP3642473 B1 EP 3642473B1
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EP
European Patent Office
Prior art keywords
injector
switch
state
current
current measurement
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.)
Active
Application number
EP18743508.6A
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German (de)
English (en)
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EP3642473A1 (fr
Inventor
Norbert SCHÖFBÄNKER
Richard Pirkl
Lorand D'ouvenou
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.)
Liebherr Components Deggendorf GmbH
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Liebherr Components Deggendorf GmbH
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Publication of EP3642473A1 publication Critical patent/EP3642473A1/fr
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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing

Definitions

  • the present invention relates to a device for detecting the status of an injector or an injector with corresponding status detection and a method for determining an injector status.
  • Injection nozzles or injectors are typically used to inject fuel into a combustion chamber of an engine. It is advantageous for an engine in which such an injector is present if a control unit is informed about the exact opening time of the injector, so that, for example, there is a particularly narrow tolerance band for the injection quantity of the fuel delivered by the injector, which is also the overall product life of the injector is beneficial.
  • the switch is closed when the injector is not energized and the valve needle of the injector is not moves or ensures that no fuel escapes from the injector.
  • the electrical switch changes its state, ie it goes into an open or a closed state. The switch changes state again when the valve needle moves back into the valve seat.
  • the switch contacts are not directly accessible or are arranged in an isolated manner in the housing of the injector.
  • Such a representation is in 1 shown.
  • one pole of the switch is connected to a pin of the injector or to a solenoid valve that actuates the injector via a resistor.
  • the other pole of the switch is also connected to the housing of the injector.
  • the injector itself is normally connected to the ground, which can be the engine block when used in a vehicle, for example. In such an implementation, only two cables or lines lead out of the housing.
  • a voltage is applied to the injector or to the solenoid valve that actuates the injector, as a result of which a mechanical and/or hydraulic movement of the valve needle is triggered.
  • the movement of the valve needle in turn opens or closes the switch. For example be provided that the switch is closed by removing the voltage.
  • the problem with this type of status detection is that there can be an indefinite time delay between applying/removing the voltage to the injector or the solenoid valve and triggering the switch, i.e. moving the valve needle out of its seat or back into its seat, since the mechanical and/or hydraulic movement of the valve needle has a certain inertia. It can happen that the switch opens when the voltage is still present at the injector or solenoid valve or, in the case of a long delay, the switch only opens when the voltage has already been removed again. A similar behavior can also occur when the switch is closed. A voltage may or may not be present at the injector or the solenoid valve during the closing phase.
  • the current through the switch is measured for a detection of the switch state, which in turn allows conclusions to be drawn about an injection state or a closed state of the injector. It must be taken into account that the switch cannot be loaded with high currents and is limited to a few mA with the help of a resistor for reasons of efficiency.
  • the output voltage (usually the vehicle battery voltage of 12 or 48 volts) must be applied via the pin from the injector or the solenoid valve (coil) that is connected to the switch.
  • 2 shows the case in which the flow of current for the situation just described is detected with the aid of a measuring circuit (not shown). As an example, here in 2 assume a current of 10 mA flowing through the resistor and the switch. Accordingly, one recognizes the state that results when the injector is not energized, but the switch is closed.
  • a jump from 0 mA to 10 mA can be easily detected. However, the change from 10 A to 10.01 A is more difficult, since the relative current increase is only 0.1%. If the resolution of the detection circuit is not high enough, there is a risk that this small increase will be perceived as disturbance or noise in the current. In a digital system, for a 0.1 percent resolution, you need at least a 1Obit system as a minimum requirement. A 0.1 percent variation would represent the minimum uncertainty due to the system resolution. It is therefore not possible with such a high-resolution system to reliably distinguish between an actual change in the value and a disturbance or noise in the current intensity. A downstream filter is also necessary to increase detection reliability.
  • the object of the present invention is as above to overcome the listed disadvantages of the prior art and to provide a device for detecting the condition of an injector, which is advantageous over the known prior art.
  • the present invention enables a clear detection of the switch state even in noisy environments that lead to fluctuations in the current strength.
  • the device according to the invention for detecting the status of an injector comprises an injector for injecting fuel into an engine combustion chamber, a switch which is designed to change its switching status depending on a status of the injector, and an evaluation unit for detecting the switching status of the switch, wherein a first switch contact of the switch is connected to an electrical input line of the injector, and a second switch contact of the switch may be connected to ground.
  • the device according to the invention is further characterized in that the evaluation unit is designed to carry out a first current measurement for a current flowing into the injector and into the switch and a second current measurement for the current flowing into the injector.
  • a current measurement is any measurement that allows conclusions to be drawn about the current flowing in a line. It is not absolutely necessary to measure the current directly.
  • the invention thus offers a solution for operating an injector with two cables and at the same time using them to detect the switch state without uncertainties due to signal noise and limited resolution.
  • the present invention uses a differential measurement. The current flowing into the injector (or into the housing accommodating the injector) and the current flowing back out of the injector are measured. With the help of an evaluation that takes into account the two measured values, it is possible to determine the state of the injector, in which case all interference factors superimposed on the flow of current are eliminated, so that a particularly precise determination of the switch state is possible.
  • the evaluation unit is also designed to determine the switching state of the switch on the basis of a difference in the measured values between the first current measurement and the second current measurement.
  • the difference between the two values automatically eliminates all superimposed signals. The result is then only the current flowing through the switch.
  • the advantage can be achieved that, compared to the asymmetrical measurement used in the prior art, all interference signals and offset currents are eliminated. Disturbances affect both current measurements to the same extent, so that the subsequent calculation of the difference does not affect the result. If the switch is closed, the difference is a very small signal, which can, however, be easily detected.
  • the way in which the state of the switch is detected is inventive compared to the prior art. Instead of measuring the absolute voltage with the assistance of a pull-up or pull-down resistor, or measuring the current in absolute terms trying to identify the slope for the switch's change of state, the current flowing towards the injector and measured symmetrically back from this. the The difference between these two measured values is used as an indicator for the state change of the switch. It is advantageous that the symmetrical measurement eliminates superimposed interference currents and noise. The result is a value that corresponds to the current through the switch. In an ideal case, a downstream filtering of this result can be dispensed with.
  • the injector is designed to switch between an injection state and a closed state, the switch also assuming a first switch state when the injector is in an injection state and a second switch state when the injector is closed.
  • the switch assumes a closed state. If, on the other hand, the nozzle needle returns to its originally reset position, in which no fuel is emitted by the injector, the switch changes to an open state.
  • the state of the switch thus depends on the state of the injector.
  • the first current measurement is made before the connection point of the line leading to the resistor. It must be ensured that the first current measurement measures both the current flowing through the switch and the current flowing through the injector.
  • the second switch contact is connected to the same ground as a circuit of the injector, preferably the ground is the body or an engine block of a vehicle.
  • the binding of The second switch contact to ground can also be made via a connection to a housing of the injector, which in turn is itself connected to ground.
  • an injector housing can be provided that has only two cables or contacts that lead to the outside, which allow particularly simple handling.
  • the evaluation unit also includes a filter in order to filter a difference between the two measured values obtained by the first current measurement and the second current measurement.
  • the injector and the switch are arranged in a common housing, which includes an input line, an output line and a ground connection. Since the ground connection of an injector is often also embodied with the aid of a receptacle of the claimed device or the housing, the housing may only have exactly two external contacts (such as lines, plug contacts or the like).
  • the first current measurement of the evaluation unit is arranged on the input line and the second current measurement of the evaluation unit is arranged on the output line of the housing.
  • the ground connection of the housing is preferably connected to the second contact of the switch.
  • the injector is a solenoid valve injector, in which a solenoid valve is preferably designed to bring about a change in the state of the injector, which in turn also causes a change in the state of the switch.
  • the switch changes its state as a result of a movement of an injector component, preferably as a result of a movement of a valve needle of the injector.
  • the injector is a common rail injector.
  • the invention also relates to a method for detecting the status of an injector according to the preamble of claim 1, wherein in the method the sum of a current flowing into the injector and a current flowing into the switch is measured by a first current measurement, and only the current flowing through the injector is measured and the current actually flowing through the switch is inferred from a difference between the first current measurement and the second current measurement.
  • the result of the difference between the first current measurement and the second current measurement is subjected to filtering.
  • the invention also relates to an internal combustion engine with a device according to one of the variants discussed above.
  • the reference number 2 shows an injector which closes or opens a switch 3 when its state changes.
  • a first contact of the switch 3 is connected via a resistor 6 to one of the two lines emanating from the injector 2 . This results in a current flowing through the resistor 6 when the switch 3 is in a closed state, which current flows via the housing 8 of the device to ground 5 .
  • the device 1 has an injector 2 which is suitable for metering fuel into a combustion chamber.
  • the injector 2 can assume a first state in which no fuel emerges and a second state in which at which fuel is dispensed. If the injector 2 is in the second state in which fuel is discharged, a switch 3 is closed. Since the first contact 31 of the switch 3 is connected to a power supply line 21 of the injector 2 via a resistor 6 , there is a current flow from the energy source of the device 1 in the direction of ground 5 , which runs through the switch 3 . The second contact 32 of the switch 3 is connected to ground 5 . The connection can be made via the housing 8 of the device 1, which is connected to the mass 5.
  • the second contact 32 of the switch 3 is only connected to the outer housing 8 of the device 1 .
  • Two lines 81 , 82 run out of the housing 8 , the first line 81 having a branch to the resistor 6 between the housing 8 and the current input of the injector 2 .
  • the second line 82 running out of the housing 8 connects the ground 5 to the current output of the injector 2.
  • a current measurement 41, 42 is provided on each of these two lines 81, 82.
  • the results of the two current measurements 41, 42 are fed to a difference module 43, which outputs the amount of the difference between the two measured values as the result. This allows the relatively small current flowing through the switch 3 to be easily detected in the presence of noise or other interference in the current.
  • FIG. 5 shows a concrete implementation of the present invention.
  • the current is output from a control logic 9 in the direction of the injector, which is shown here as an injector coil 23 for the sake of simplicity, and a resistor 6 .
  • the current strength is measured using a shunt resistor 411 and an operational amplifier 412.
  • This first current measurement 41 measures both the current I CT flowing through the resistor 6 and the current I HS flowing through the injector.
  • the second current measurement 42 is also carried out with the aid of a shunt resistor 421, in which the current flowing through it is determined with a further operational amplifier 422.
  • the two operational amplifiers 412 and 422 have the same amplification factors k.
  • the two outputs of the operational amplifiers (OPV) 412 and 422 are given to a differential module 43 . This makes it possible to determine the voltage difference between the voltage drop across the two shunt resistors 411 and 421 and to pass their difference on to a filter 7 .
  • FIG. 6 shows a further embodiment of the invention with a transformer.
  • a transformer 423 can also be used. This only works with alternating current, but is also able to detect the time at which the switch 3 is actuated. The polarity of the pulse from the transformer 423 would indicate the opening or closing of the switch 3.
  • the injector If the injector is not energized, the detection does not work. For example, when all currents have already subsided, but the injector is still open due to inertia. In such a case, you would not be able to record the closing time.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Road Repair (AREA)

Claims (14)

  1. Dispositif (1) de détection de l'état d'un injecteur (2), comprenant :
    un injecteur (2) pour injecter du carburant dans une chambre de combustion de moteur,
    un commutateur (3) qui est configuré pour modifier son état de commutation en fonction d'un état de l'injecteur (2), et
    une unité d'évaluation (4) pour détecter l'état de commutation du commutateur (3),
    dans lequel
    un premier contact de commutateur (31) du commutateur (3) est relié à une ligne d'entrée (21) électrique de l'injecteur (2), et
    un deuxième contact de commutateur (32) du commutateur (3) est relié à la masse (5),
    caractérisé en ce que
    l'unité d'évaluation (4) est configurée pour réaliser une première mesure de courant (41) pour un courant (IHS, ICT) affluant dans l'injecteur (2) et dans le commutateur (3) et une deuxième mesure de courant (42) pour le courant (ILS) circulant seulement à travers l'injecteur (2), dans lequel l'unité d'évaluation (4) est configurée en outre pour définir l'état de commutation du commutateur (3) sur la base d'une différence des valeurs de mesure entre la première mesure de courant (41) et la deuxième mesure de courant (42).
  2. Dispositif (1) selon la revendication 1, dans lequel
    l'injecteur (2) est configuré pour alterner entre un état d'injection et un état fermé, et
    le commutateur (3) adopte, dans un état d'injection de l'injecteur (2), un premier état de commutateur, et, dans un état fermé de l'injecteur (2), un deuxième état de commutateur.
  3. Dispositif (1) selon l'une quelconque des revendications précédentes, dans lequel le premier contact de commutateur (31) est relié par l'intermédiaire d'une résistance (6) à la ligne d'entrée (21) de l'injecteur (2).
  4. Dispositif (1) selon l'une quelconque des revendications précédentes, dans lequel le deuxième contact de commutateur (32) est relié à la même masse (5) qu'un circuit de courant de l'injecteur (2), de préférence la masse (5) est la carrosserie ou un bloc moteur d'un véhicule.
  5. Dispositif (1) selon l'une quelconque des revendications précédentes, dans lequel l'unité d'évaluation (4) comprend en outre un filtre (7) pour filtrer une différence des deux valeurs de mesure obtenues par la première mesure de courant (41) et la deuxième mesure de courant (42).
  6. Dispositif (1) selon l'une quelconque des revendications précédentes, dans lequel l'injecteur (2) et le commutateur (3) sont disposés dans un boîtier (8) commun, qui comprend une ligne d'entrée (81), une ligne de sortie (82) et un raccord de masse (83).
  7. Dispositif (1) selon la revendication 6, dans lequel la première mesure de courant (41) de l'unité d'évaluation (4) est disposée sur la ligne d'entrée (81) et la deuxième mesure de courant (42) de l'unité d'évaluation (4) est disposée sur la ligne de sortie (82) du boîtier (8).
  8. Dispositif (1) selon l'une quelconque des revendications 6 ou 7, dans lequel le raccord de masse (83) est relié au deuxième contact (32) du commutateur (3).
  9. Dispositif (1) selon l'une quelconque des revendications précédentes, dans lequel l'injecteur (2) est un injecteur d'électrovanne (2), dans lequel de préférence une électrovanne est configurée pour provoquer un changement d'état de l'injecteur (2), qui entraîne à nouveau également un changement d'état du commutateur (3).
  10. Dispositif (1) selon l'une quelconque des revendications précédentes, dans lequel le commutateur (3) change son état en raison d'un déplacement d'un composant d'injecteur, de préférence en raison d'un déplacement d'un pointeau de vanne de l'injecteur (2).
  11. Dispositif (1) selon l'une quelconque des revendications précédentes, dans lequel l'injecteur (2) est un injecteur à rampe commune.
  12. Procédé de détection de l'état d'un injecteur (2) selon le préambule de la revendication 1, dans lequel dans le procédé :
    la somme d'un courant (IHS) circulant dans l'injecteur (2) et d'un courant (ICT) circulant dans le commutateur (3) est mesurée par une première mesure de courant (41),
    seul le courant (ILS) circulant à travers l'injecteur (2) est mesuré par une deuxième mesure de courant (42), et
    le courant (ICT) circulant réellement à travers le commutateur (3) est déduit du fait d'une différence de la première mesure de courant (41) par rapport à la deuxième mesure de courant (42).
  13. Procédé selon la revendication 12, dans lequel le résultat de la différence de la première mesure de courant (41) par rapport à la deuxième mesure de courant (42) est soumis à un filtrage (7).
  14. Moteur à combustion interne avec un dispositif (1) selon l'une quelconque des revendications 1 à 11.
EP18743508.6A 2017-07-20 2018-07-20 Dispositif de détection de l'état d'un injecteur Active EP3642473B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017116379.4A DE102017116379A1 (de) 2017-07-20 2017-07-20 Vorrichtung zur Zustandserfassung eines Injektors
PCT/EP2018/069796 WO2019016380A1 (fr) 2017-07-20 2018-07-20 Dispositif de détection de l'état d'un injecteur

Publications (2)

Publication Number Publication Date
EP3642473A1 EP3642473A1 (fr) 2020-04-29
EP3642473B1 true EP3642473B1 (fr) 2022-11-30

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Application Number Title Priority Date Filing Date
EP18743508.6A Active EP3642473B1 (fr) 2017-07-20 2018-07-20 Dispositif de détection de l'état d'un injecteur

Country Status (6)

Country Link
US (1) US11111892B2 (fr)
EP (1) EP3642473B1 (fr)
CN (1) CN111051682B (fr)
DE (1) DE102017116379A1 (fr)
ES (1) ES2939061T3 (fr)
WO (1) WO2019016380A1 (fr)

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FR3083883B1 (fr) * 2018-07-10 2020-06-12 Continental Automotive France Procede de controle d'un convertisseur de tension continu-continu
DE102018125803A1 (de) * 2018-10-17 2020-04-23 Liebherr-Components Deggendorf Gmbh Injektor
GB2585196B (en) * 2019-07-01 2021-10-27 Delphi Tech Ip Ltd Method and system to determine the state of needle valve of a fuel injector
DE102020111787A1 (de) 2020-04-30 2021-11-04 Liebherr-Components Deggendorf Gmbh Vorrichtung zur Zustandserfassung eines Kraftstoffinjektors

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ES2939061T3 (es) 2023-04-18
US11111892B2 (en) 2021-09-07
CN111051682A (zh) 2020-04-21
CN111051682B (zh) 2022-08-02
WO2019016380A1 (fr) 2019-01-24
US20200256297A1 (en) 2020-08-13
EP3642473A1 (fr) 2020-04-29
DE102017116379A1 (de) 2019-01-24

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