WO2018069376A1 - Procédé et appareil pour détecter une impédance de contact entre des pièces mobiles de soupape d'injecteur - Google Patents

Procédé et appareil pour détecter une impédance de contact entre des pièces mobiles de soupape d'injecteur Download PDF

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Publication number
WO2018069376A1
WO2018069376A1 PCT/EP2017/075897 EP2017075897W WO2018069376A1 WO 2018069376 A1 WO2018069376 A1 WO 2018069376A1 EP 2017075897 W EP2017075897 W EP 2017075897W WO 2018069376 A1 WO2018069376 A1 WO 2018069376A1
Authority
WO
WIPO (PCT)
Prior art keywords
injector
terminal
components
voltage
switch
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/EP2017/075897
Other languages
English (en)
Inventor
Jean-Marc Feiereisen
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.)
Borgwarner US Technologies LLC
Original Assignee
Delphi Technologies IP Ltd
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 Delphi Technologies IP Ltd filed Critical Delphi Technologies IP Ltd
Priority to EP17781492.8A priority Critical patent/EP3526460B1/fr
Publication of WO2018069376A1 publication Critical patent/WO2018069376A1/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
    • 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
    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • 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
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0618—Actual fuel injection timing or delay, e.g. determined from fuel pressure drop
    • 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
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/063—Lift of the valve needle

Definitions

  • This disclosure relates to fuel injectors and has particular but not exclusive application to fuel injectors where movement of a valve needle away from a valve seat is controlled by an actuator indirectly via a hydraulic (servo) system. It has general application to controlling or detecting relative movement of moving parts in a fuel injector valve system,
  • Fuel injectors generally comprise an actuator controlled valve adapted to move a valve needle away from a valve seat to dispense fuel.
  • Such injectors are typically operated by energizing an actuator such as a solenoid actuator, the movement of the actuator causing the valve to open or shut.
  • the actuator may directly control movement of the needle and pintle.
  • the fuel injector includes a hydraulic amplification circuit (servo) where movement of the actuator allows fuel under pressure to flow to force the needle assembly to move.
  • injector closed loop control where means are provide which determine contact between moving parts e.g. needle and valve seat. This is usually performed by determining the electrical contact between moving parts by e.g. providing an electrical contact switch, e.g. between the injector needle and nozzle, or between other appropriate moving parts.
  • injectors may be provided with additional wiring in order to implement this. So in an example, the injector needle tip may form an electrical contact switch. If the injector is closed, a current can flow through this switch. If the injector opens, the needle is lifting from its seat, fuel starts to flow and the electrical contact is disrupted.
  • the expected time precision of the measured signal is in the range of lus.
  • RICL RICL that is the measured resistance between e.g. needle and seat
  • RICL may have low and high impedances, and contain information about how close the needle is to the seat.
  • a system adapted to detect the electrical continuity between components of an actuator operated fuel injector , where said components are adapted move relative to one another in operation, said system including a wire connected to an electrical contact point on said fuel injector from a supply voltage (VICL ) forming a circuit allowing current to pass through said injector (Iinj) to ground via said components when said components have a degree of electrical continuity, and including a constant current source and transistor switch (Ql) connected in parallel such that one terminal of the current source is connected to the supply voltage VICL and a first terminal of the transistor switch, and the other terminal of said current source is connected to said electrical contact and a second terminal of the transistor switch, such that current from the constant current source is adapted to forma first pathway through the injector dependent on said electrical continuity and a second pathway though the switch via the from said second terminal to the third terminal of the transistor switch.
  • VIP supply voltage
  • Ql constant current source and transistor switch
  • Said first terminal may be the base or gate of a bipolar or FET.
  • the system may include means to measure the voltage at a point on said second pathway (Vmeasl, Vmeas 2).
  • the system may include means to measure the voltage at the second or third terminals of said transistor.
  • the transistor may be a bi-polar transistor and including a measurement resistor connect to the collector terminal of said transistor and means to measure the voltage at a point between said collector terminal and measurement resistor.
  • the system may including means to measure the current passing through the switch from the constant current source.
  • the system may include a diode and/or resistor located between supply voltage and injector point in parallel with said constant current source.
  • a method of determining the degree of electrical continuity between components of an actuator operated fuel injector, where said components are adapted move relative to one another in operation comprising using the system as above, and a) measuring the current or voltage at a point in said second pathway, and b) determining said degree of electrical continuity from the results of a).
  • step b) includes determining said degree of electrical continuity from the results said changes.
  • the components may be a needle and needle valve seat.
  • Figure 1 shows a schematic diagram of a fuel injector which include an additional wire to detect connectivity between injector moving parts such as needle and valve seat.
  • Figure 2 shows a prior art circuit used in conjunction with figure 1 design to detect electrical contact between moving parts
  • Figure 3 shows an example according to one embodiment of a circuit used to detect electrical contact.
  • Figure 4 shows a plot of parameters of the circuit of figure 3.
  • Figure 1 shows a schematic diagram of a fuel injector 1 which is adapted to provide feedback control by including means to detect contact between moving parts such as the needle tip with the valve seat.
  • the figure shows a known fuel injector 1 which is controlled by an actuator such as a solenoid actuator shown schematically by 2.
  • An Engine Control Unit (ECU) 3 sends an activation signal (pulse) profile to the actuator, in order to actuate it via lines 4.
  • the signal may be a Pulse Width Modulation signal.
  • the fuel injector includes a needle 5 adapted to move within a needle body (housing) 6.
  • the needle body forms or includes a valve seat. Generally contact of the needle with the valve seat means the valve is closed. When the needle moves away from the valve seat there is no contact and fuel is dispensed.
  • an additional circuit which includes a wire or lead 7 from the ECU.
  • the circuit may be arranged such that current can flow through wire and through the metal injector components.
  • the circuit may include one or more effective "switches” whereby contact of e.g. valve seat and needle allows current to flow through the circuit to ground. Where there is no contact, current cannot in theory flow.
  • this allows the ECU to determining the operating state of the valve and when components such as the valve seat and needle move away from contact or when they move together to form a contact.
  • FIG 1 existing circuitry for measuring impendance and thus electrical contact may be part of the ECU and is shown generally by reference numeral 10.
  • FIG. 2 shows existing circuitry used to determine the impedance of the contact (electrical switch) between valve moving parts such as needle and seat...
  • Such existing electronics may be located or interface inside the ECU as in figure 1 and have the functionality of the circuitry 8 of figure 1.
  • the circuitry consists of a known supply voltage VICL to which a diode Dl in series with a low impedance pull-up resistor RPU1 is connected.
  • RPU1 is also connected to the injector needle wire 7, which as previously described is connected to injector moving parts which form one or more effective electrical switches.
  • Vinj a voltage designated Vinj.
  • a high impedance pull-up resistor RPU2 is connected between VICL and wire 7, such that the two resistors are connected in parallel.
  • the wire 7 is connected to voltage measurement means, essentially therefore providing analog read back of the voltage on line 7.
  • valve needle and seat form an electrical switch, and so when in contact the injector is nominally closed. Current can therefore flow through from VICL through the resistor RPU 1 and the needle tip to ground. The voltage on line 7 Vinj which is the measured voltage Vmeasl thus falls to a low value or zero. If the injector is opened, the valve components (e.g. needle tip and valve seat) are not in electrical contract. There is no current flow through the resistor and the needle tip to ground. The VICL thus pulls -up the voltage Vmeasl to a higher voltage level.
  • the measurement voltage Vmeasl will be an intermediate voltage between zero and the voltage VICL dependent on whether the valve is closed (electrical contact) or open (no electrical contact) as also to an extent the resistance of the injector. So the measurement Vmeasl is a resistive division between the pull-ups and the switch resistance (RINJ). The two conditions are summarized below:
  • the method and circuitry require electrical low pass filtering (R*C) of signal due to time shift - if the value of Rinj is very high , the signal change when the valve changes state is very low and the signal processing treatment difficult.
  • R*C electrical low pass filtering
  • the impedance might be quite high, even if the switch is closed. In this case, the voltage on the switch is close to VICL and the change in impedance can be seen by a small voltage change. This voltage change is quite small, which makes signal treatment on the measurement circuit difficult.
  • the injector has significant electrical capacitance. Together with RPU2, the measurement circuit decodes a heavily filtered signal, which results in a smaller voltage drop and in a time lag.
  • Figure 3 shows an example according to one aspect.
  • the figure is similar to figure 2.
  • the circuitry consists again of a known supply voltage VICL, to connected to the injector needle wire 7, which as previously described is connected to injector moving parts which form one or more effective electrical switches.
  • the connection is via optionally a diode Dl in series with a low impedance pull-up resistor RPU1.
  • the wire or line 7 has a voltage designated Vmj.
  • a current source 8 is provided which provide a current II .
  • a switch Ql is connected also in parallel between VICL and the line 7; the switch may comprise a transistor.
  • the base of the transistor is connected to VICL and the other two terminals are connected respectively to ground via measurement resistor Rmeas2 and the line 7.
  • the voltage at a point between the switch and the resistor Rmeas2 is forwarded to a measurement means and it designated Vmeas2.
  • a measure of the current flowing through the injector can be determined by the circuitry of figure 3.
  • a measure of the current flowing through the injector can be determined by the circuitry of figure 3.
  • only very small currents may flow through the injector when there is appropriate contacts of parts (e.g. needle and valve seat) so that current can flow from VICL to ground via the injector.
  • Vmeas2 is read and this is used to determine a measure of the current through the injector.
  • Vmeasl is used instead or additionally.
  • Iinj the current that goes through the injector as shown in figure 3
  • IRmeas the current that goes through the resistor Rmeas.
  • Figure 4 shows a plot of and (a) Iinj, (b) Vmeas2, (c) Vmeas 1 against time.
  • This example is for a fuel injectors where movement of a valve needle away from a valve seat is controlled by an actuator indirectly via a hydraulic (servo) system.
  • a plot d) of current through the solenoid/coil (Icoil) is also shown to give an additional time reference.
  • plots of a) b) and c) are applicable to for other designs of fuel injectors to detect when any injector moving parts come into contact or move away from contact to each other.
  • the connections with respect figure 1 and figure 3 determine the current flowing across the needle and seat, so Iinj is this current. It is to be noted that in respect to this only a portion of the activation pulse (current) profile is shown.
  • Time span A shows the end of the actuator "hold" phase, following a high, generally short activation phase.
  • the injector valve is a solenoid driven actuator that will, once opened, allow fuel flow inside the injector that will, subsequently, through hydraulic amplification, result in opening the injector needle. Once the injector needle is opened, there is fuel flow.
  • the actuator valve has already opened and usually a short time after the end of the hold phase the needle starts to lift away from its seat i.e, injector valve opens. This is an important parameter which examples of the invention allow to be accurately determined.
  • the time delay between valve opening and needle opening is mainly influenced by fuel viscosity and pressure, it is mostly independent of the injector current waveform.
  • the needle opening is at point X.
  • the current through the injector i.e. between needle and valve seat rapidly falls as the valve seat and needle move away from each other. This is detected by the fact that Vmeasl and Vmeas2 start to rise. So in other words, at point X, when the current through the injector falls in value (e.g. when valve parts move away from each other) the voltage at Vmeasl and Vmeas2 rises distinctly. This is particularly pronounced on Vmeas2.
  • examples of the invention can be used for any two valve components which move relative to one another and especially which come into contact or close contact.
  • needle seat valve body
  • detecting when the needle is in contact with needle seat it can be used to detect when e.g. an actuator (e.g. end) comes into contact with a valve component (e.g. a component of the servo valve system). It is applicable to both solenoid and piezo actuated injectors.

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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)

Abstract

La présente invention concerne un système conçu pour détecter la continuité électrique entre des composants d'un injecteur de carburant actionné par un actionneur (1), lesdits composants étant conçus pour se déplacer l'un par rapport à l'autre en fonctionnement, ledit système comprenant un fil (7) raccordé à un point de contact électrique sur ledit injecteur de carburant à partir d'une tension d'alimentation (VICL) formant un circuit permettant le passage du courant à travers ledit injecteur (Iinj) vers le sol par l'intermédiaire desdits composants lorsque lesdits composants ont un degré de continuité électrique, et comprenant une source de courant constant (8) et un commutateur de transistor (Q1) raccordés en parallèle de telle sorte qu'une borne de la source de courant est raccordée à la tension d'alimentation VICL et à une première borne du commutateur de transistor, et l'autre borne de ladite source de courant est raccordée au dit contact électrique et à une deuxième borne du commutateur de transistor, de telle sorte que le courant provenant de la source de courant constant est conçu pour former un premier trajet à travers l'injecteur en fonction de ladite continuité électrique et un second trajet à travers le commutateur par l'intermédiaire de la première borne et de la troisième borne du commutateur à transistor.
PCT/EP2017/075897 2016-10-14 2017-10-11 Procédé et appareil pour détecter une impédance de contact entre des pièces mobiles de soupape d'injecteur Ceased WO2018069376A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17781492.8A EP3526460B1 (fr) 2016-10-14 2017-10-11 Procédé et appareil pour détecter une impédance de contact entre des pièces mobiles de soupape d'injecteur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1617449.2A GB2554916B (en) 2016-10-14 2016-10-14 Method and apparatus to detect impedance of contact between injector valve moving parts
GB1617449.2 2016-10-14

Publications (1)

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WO2018069376A1 true WO2018069376A1 (fr) 2018-04-19

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PCT/EP2017/075897 Ceased WO2018069376A1 (fr) 2016-10-14 2017-10-11 Procédé et appareil pour détecter une impédance de contact entre des pièces mobiles de soupape d'injecteur

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GB (1) GB2554916B (fr)
WO (1) WO2018069376A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3089564B1 (fr) * 2018-12-07 2023-01-27 Delphi Tech Ip Ltd Dispositif de décharge d’un interrupteur

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4541271A (en) * 1982-11-16 1985-09-17 Robert Bosch Gmbh Measuring arrangement for continuous monitoring operating parameters of an internal combustion engine
EP0766785A1 (fr) * 1992-11-30 1997-04-09 Perkins Limited Ameliorations apportees a des vannes de regulation de debit pour fluide
EP1313941A1 (fr) * 2000-08-21 2003-05-28 Volvo Lastvagnar AB Dispositif detecteur de la position d'une aiguille
DE10319329A1 (de) * 2003-04-29 2004-11-25 Siemens Ag Einspritzventil mit Sitzkontaktschalter
DE10333358B3 (de) * 2003-07-23 2005-05-25 Siemens Ag Schaltungsanordnung und Verfahren zum Betreiben einer Injektoranordnung sowie Injektor
US20080149072A1 (en) * 2005-02-17 2008-06-26 Klaus Rottenwohrer Circuit Arrangement and Method for Operating an Injector Arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1586254A (en) * 1977-06-22 1981-03-18 Lucas Industries Ltd Fuel injection nozzle unit for supplying fuel to an internal combustion engine
JPS5932668A (ja) * 1982-08-17 1984-02-22 Japan Electronic Control Syst Co Ltd 内燃機関の燃料噴射弁リフト検出装置
US6420817B1 (en) * 2000-02-11 2002-07-16 Delphi Technologies, Inc. Method for detecting injection events in a piezoelectric actuated fuel injector
GB2515359A (en) * 2013-06-19 2014-12-24 Continental Automotive Systems Solenoid-actuator-armature end-of-motion detection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4541271A (en) * 1982-11-16 1985-09-17 Robert Bosch Gmbh Measuring arrangement for continuous monitoring operating parameters of an internal combustion engine
EP0766785A1 (fr) * 1992-11-30 1997-04-09 Perkins Limited Ameliorations apportees a des vannes de regulation de debit pour fluide
EP1313941A1 (fr) * 2000-08-21 2003-05-28 Volvo Lastvagnar AB Dispositif detecteur de la position d'une aiguille
DE10319329A1 (de) * 2003-04-29 2004-11-25 Siemens Ag Einspritzventil mit Sitzkontaktschalter
DE10333358B3 (de) * 2003-07-23 2005-05-25 Siemens Ag Schaltungsanordnung und Verfahren zum Betreiben einer Injektoranordnung sowie Injektor
US20080149072A1 (en) * 2005-02-17 2008-06-26 Klaus Rottenwohrer Circuit Arrangement and Method for Operating an Injector Arrangement

Also Published As

Publication number Publication date
GB2554916A (en) 2018-04-18
GB2554916B (en) 2020-01-29
EP3526460B1 (fr) 2022-06-29
GB201617449D0 (en) 2016-11-30
EP3526460A1 (fr) 2019-08-21

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