EP1488088B1 - Procede et dispositif de detection du moment d'impact du pointeau d'une soupape de commande piezoelectrique - Google Patents

Procede et dispositif de detection du moment d'impact du pointeau d'une soupape de commande piezoelectrique Download PDF

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Publication number
EP1488088B1
EP1488088B1 EP03720240A EP03720240A EP1488088B1 EP 1488088 B1 EP1488088 B1 EP 1488088B1 EP 03720240 A EP03720240 A EP 03720240A EP 03720240 A EP03720240 A EP 03720240A EP 1488088 B1 EP1488088 B1 EP 1488088B1
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EP
European Patent Office
Prior art keywords
piezo
impact
moment
voltage
control valve
Prior art date
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Expired - Lifetime
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EP03720240A
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German (de)
English (en)
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EP1488088A1 (fr
Inventor
Jörg BEILHARZ
Richard Pirkl
Harald Schmidt
Peter Voigt
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Continental Mechatronic Germany GmbH and Co KG
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Volkswagen Mechatronic GmbH and Co KG
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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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/003—Measuring variation of fuel pressure in high pressure line
    • 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
    • F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using piezoelectric operating means
    • 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
    • F02D2041/2051—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using voltage control
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable pressure
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift

Definitions

  • the invention relates to a method and a device for detecting the impact time of the valve needle of a piezo control valve of a pump-nozzle unit. Furthermore, the invention relates to a method and an apparatus for controlling and / or regulating the operation of a piezo control valve of a pump-nozzle unit.
  • Pump-nozzle units are used for supplying fuel into a combustion chamber of an internal combustion engine.
  • This may be, for example, a pump-nozzle unit with a controllable and / or controllable fuel pump, a fuel injector, which has a between a closed position and an open position reciprocating nozzle needle, a first pressure chamber of the fuel pump with below a first pressurized fuel is fillable, a second pressure chamber, wherein in the second pressure chamber at a second pressure stationary fuel exerts a closing force on the nozzle needle, and a third pressure chamber communicating with the first pressure chamber, wherein in the third pressure chamber below a third Pressurized fuel exerts an opening force on the nozzle needle.
  • Pump-nozzle units are used in particular in connection with pressure-controlled injection systems.
  • An essential feature of a pressure-controlled injection system is that the fuel injector opens as soon as an opening force, which is influenced at least by the prevailing pressure, is exerted on the nozzle needle.
  • Such pressure-controlled injection systems are used for fuel metering, fuel preparation, the formation of the course of injection and a seal of the fuel supply against the combustion chamber of the internal combustion engine.
  • pressure controlled Injection systems can be the temporal course of the flow rate during the injection control in an advantageous manner. This can have a positive influence on the engine's performance, fuel consumption and pollutant emission.
  • the fuel pump and the fuel injector are typically formed as an integral component.
  • at least one pump-nozzle unit is provided, which is usually installed in the cylinder head.
  • the fuel pump typically includes a fuel pump piston reciprocating in a fuel pump cylinder, which is driven either directly via a plunger or indirectly via rocker arms of a camshaft of the internal combustion engine.
  • the usually the first pressure chamber forming portion of the fuel pump cylinder is connected via a control valve with a fuel low pressure region, wherein sucked with the control valve open fuel from the low-pressure fuel area in the first pressure chamber and pushed back at further open control valve from the first pressure chamber in the low-pressure fuel area becomes.
  • the fuel pump piston compresses the fuel in the first pressure chamber and thus builds up the pressure.
  • the control valve in the form of a solenoid valve.
  • solenoid valves usually have a relatively long response time, which is particularly due to the fact that the magnet armature of a solenoid valve can not be accelerated arbitrarily fast due to the mass inertia forces dependent on its mass.
  • the structure of the magnetic field for generating the tightening force requires time.
  • a pump-nozzle unit equipped with a solenoid valve is known, for example, from EP 0 277 939 B1.
  • pump-nozzle units with a control valve which is operated piezoelectrically.
  • a pump-nozzle unit is known for example from DE 198 35 494 A1.
  • Pump-nozzle units with a piezo control valve may have problems with injection quantity accuracy. This is in particular due to the fact that the actual closing and opening times of the piezo control valve in operation are not known.
  • the piezo actuator in the piezo control valve In order to minimize injection quantity scattering, the piezo actuator in the piezo control valve must be charged or discharged as accurately as possible, for example for setting the beginning, duration and energy of a valve closing operation.
  • mechanical manufacturing tolerances, wear, temperature and aging processes can lead to an undefined closing and / or opening process.
  • an injection valve with a control circuit and a method for controlling an injection valve is known.
  • the control circuit is connected to a sensor which detects the pressure in the control room.
  • the actuator that influences the access control room is controlled for a precise injection process.
  • a control circuit and sensors and a voltmeter are provided to detect the pressure in the control room.
  • the pressure in the control chamber is also applied to the piezoelectric actuator, wherein a voltage is detected at the terminals of the piezoelectric actuator with the voltmeter and to the control circuit is passed on.
  • the recorded voltage is compared with tables and based on the tables a pressure in the control room determined.
  • a striking of a control piston, which is in communication with the nozzle needle be detected in that when hitting the terminals of the piezoelectric actuator, a voltage increase occurs, which is detected by the control circuit.
  • a piezoelectric injection valve which controls a servo valve for actuating the nozzle needle with the aid of the piezoelectric actuator.
  • the piezoelectric actuator is used to detect the contact between the nozzle needle and a closing member of the servo valve.
  • a piezoelectrically operated injection valve in which a sensor is used, which detects the movement of the nozzle needle. In case of malfunction, the piezoelectric actuator is driven accordingly to compensate for the malfunction.
  • JP 06177449 A a circuit arrangement is known which detects exact values of the expansion and shortening of a piezoelectric actuator.
  • the evaluation circuit monitors the Current and voltage over time and determines from the energy value and the time the exact value for the change in length.
  • the invention has for its object to provide a method and an apparatus with which or with the actual closing and / or opening times of the piezo control valve can be detected.
  • the inventive method for detecting the impact time of the valve needle, a piezo control valve of a pump-nozzle unit is characterized in that the detection of the Einschlagzeitrelatess of the valve needle by evaluation of the piezoelectric voltage and / or the piezoelectric current takes place.
  • the Einschlagzeitrelatess the valve needle is obtained in particular a feedback for the actual closing time of the piezo control valve and for the opening behavior.
  • This feedback can be used in a particularly advantageous manner for higher-level controls and / or regulations.
  • the solution according to the invention for example, the determination of the actual start of delivery is possible.
  • the running times of the piezo control valve during closing and opening can be used for more accurate positioning of the valve needle and the setting of a sufficient seat reserve is possible for the entire operating time.
  • the evaluation of the piezo voltage comprises the detection of at least one discontinuity in the course of the piezo voltage.
  • the Control valve mechanism such as pressure plate, lever and valve needle
  • the counterforce on the piezo actuator is suddenly increased by the mechanical coupling, which is reflected directly in the piezo voltage as a point of discontinuity.
  • a suitable detection circuit which is a differentiator with downstream threshold detection, it is possible to detect this discontinuity in the electrical measured variable.
  • the evaluation of the piezoelectric voltage comprises the detection of at least one pulse in the course of the piezoelectric voltage.
  • the control valve mechanism such as pressure plate, lever and valve needle
  • the receding piezo actuator not follow force-locking.
  • the valve needle is accelerated so much during the opening process by the Abêtpuls that occurs when it hits the piezo actuator already in the starting position, a mechanical force pulse.
  • charge carriers are induced, which leads to a voltage pulse, for example, between an output stage and the piezoactuator.
  • This pulse of the electrical measured variable can be detected with a detection circuit, which can be formed for example by a simple threshold detection.
  • the method for controlling and / or regulating the operation of a piezo control valve of a pump-nozzle unit that the impact time detected by the method according to the invention for detecting the impact time and / or by the device according to the invention for detecting the impact time Valve needle of the piezo control valve on a known time Auxiliary size is related.
  • the known temporal auxiliary variable may be, for example, a suitable control signal.
  • the known time auxiliary variable comprises a control signal that defines the beginning or the end of a fuel injection.
  • SOI start of injection
  • the time offset between the time of impact of the valve needle and the SOI signal corresponds to the transit time between the start of energization and the actual start of delivery of the pump-nozzle unit. Since it is possible to correlate the transit time to the energy introduced, it is possible, for example, to determine a seat force reserve.
  • the inventive device for detecting the Einschlagzeityak the valve needle of a piezo control valve of a pump-nozzle unit is characterized in that it evaluates the piezoelectric voltage and / or the piezoelectric current for detecting the Einschlagzeitrelatess the valve needle.
  • the detection circuit has a differentiator with downstream threshold detection.
  • the evaluation of the piezo voltage comprises the detection of at least one discontinuity in the course of the piezo voltage and / or of the piezoelectric current.
  • the evaluation of the piezoelectric voltage comprises the detection of at least one pulse in the course of the piezoelectric voltage.
  • the device according to the invention for controlling and / or regulating the operation of a piezo control valve of a pump-nozzle unit is characterized in that it comprises a method according to the invention for detecting the point of impact of the valve needle and / or an inventive device for detecting the impact time the valve needle detected impact time of the valve needle of the piezo control valve refers to a known time auxiliary value.
  • the known temporal auxiliary variable comprises a control signal which determines the start or the end of a fuel injection.
  • the invention is based on the finding that the piezoelectric voltage signals are superimposed, which can be used for feedback, especially in connection with regulations for the injection quantity correction.
  • FIG. 1 shows schematically a pump-nozzle unit.
  • the illustrated pump-nozzle unit for supplying fuel 10 into a combustion chamber 12 of an internal combustion engine has a fuel pump 14-22.
  • a fuel pump piston 14 in a fuel pump cylinder 16 is movable back and forth.
  • the fuel pump piston 14 is driven directly or indirectly via a camshaft, not shown, of the internal combustion engine.
  • the compression space of the fuel pump cylinder 16 forms a first pressure chamber 28.
  • the first pressure chamber 28 is connected via a fuel line 20 to a piezo control valve 22.
  • the piezo control valve 22 serves to either close the fuel line 20 or to connect it to a fuel low-pressure region 18, from which fuel 10 can be sucked.
  • the illustrated unit injector further includes a fuel injector, generally designated 24, which reciprocates between a closed position and an open position Nozzle needle 46 has.
  • a pressure pin 26 can, in relation to the representation of FIG. 1, in particular exert a downward force on the nozzle needle 46.
  • a shim 40 is provided, which is guided in a second pressure chamber 30, wherein in the second pressure chamber 30 at a second pressure p 30 standing fuel 10 via the pressure pin 26 with respect to the illustration of Figure 1 down directed closing force on the nozzle needle 46 exerts.
  • the shim 40 is preferably only so strongly sealed relative to the second pressure chamber 30 that the second pressure p 30 is already degraded before the start of a new injection cycle.
  • a further downwardly directed further closing force is exerted by a first spring 36 on the pressure pin 26 and thus the nozzle needle 46, wherein the first spring 36 is disposed in the second pressure chamber 30 and is supported with its rear end on the dial 40.
  • a shoulder 44 having a portion of the nozzle needle 46 is surrounded by a third pressure chamber 32 which communicates with the first pressure chamber 28 via a connecting line 42.
  • a third pressure p 32 is built up in the third pressure chamber 32 as a function of the first pressure p 28 prevailing in the first pressure chamber 28.
  • the standing in the third pressure chamber 32 under the third pressure P 32 fuel 10 exerts a relation to the illustration of Figure 1 upward opening force on the nozzle needle 46.
  • the nozzle needle 46 assumes its open position as long as a difference between the opening force caused by the third pressure p 32 and the sum of the closing force generated by the second pressure p 30 and the closing force generated by the first spring 36 exceeds a predetermined value.
  • the nozzle opening pressure can be influenced via the second pressure p 30 in the second pressure chamber 30.
  • a pressure limiting device can be provided. and -halteventil 34 may be provided between the first pressure chamber 28 and the second pressure chamber 30.
  • the coupling of an embodiment of the device 80 according to the invention to the piezo control valve 22 explained in more detail with reference to FIG. 2 is also shown in FIG.
  • FIG. 2 shows a schematic partial sectional view of a piezo control valve 22 which can be used with the pump-nozzle unit of Figure 1.
  • the illustrated piezo-control valve 22 has a valve needle 48 which can be moved to close the piezo control valve 22 in the illustrated first end position and the complete opening of the piezo control valve 22 in a second end position, which moved relative to the representation to the right is.
  • a valve plate 64 provided on the valve needle 48 cooperates with a housing-side valve seat 62.
  • the low-pressure fuel area 18 is closed relative to a high-pressure chamber 38, which communicates with the fuel line 20 shown in FIG.
  • the piezo control valve 22 has a piezoactuator or a piezoelectric element 76. With suitable control of the piezoelectric element 76, this exerts a force on a pressure piece 54 via an end face 78.
  • the pressure member 54 transmits the force generated by the piezoelectric element 76 in turn to a first lever 56 and a second lever 58, wherein the first lever 56 and the second lever 58 are provided to effect a power transmission.
  • the first lever 56 and the second lever 58 abut against a second axial end surface 72 of the valve needle 48 to transmit the translated force generated by the piezo element 76 to the valve needle 48.
  • the translated force generated by the suitably driven piezoelectric element 76 acting on the valve needle 48 is greater than an opposing force generated by a second spring 66 and exerted via a spring pressure member 68 on a first axial end surface 70 of the valve needle 48.
  • the low-pressure fuel area 18 is connected to a Abêtraum 50 in connection, which is also connected via a balancing bore 52 with a located in front of the piezoelectric element 76 actuator chamber 74 in connection.
  • This actuator chamber 74 is in communication with a return 60, via which fuel can flow back out of the actuator chamber 74.
  • FIG. 3 shows an example of the course of the piezo voltage u (t), the time derivative of the piezo voltage u '(t) and the valve needle stroke h (t) for an injection.
  • the time derivative of the piezoelectric voltage u '(t) for example, discontinuities of the course of the piezoelectric voltage u (t) can be detected in a simple manner.
  • FIG. 4 shows the course of the piezo voltage u (t), of the piezoelectric current i (t) and of the valve needle stroke h (t) for a closing operation of the piezo control valve.
  • the piezo control valve is actually closed.
  • the time t c corresponding to the moment of impact of the valve needle 48.
  • the reaction force on the piezo actuator 76 by the mechanical coupling is abruptly increased, which directly in a discontinuity in the piezo voltage U (t)
  • Time t c reflects.
  • This discontinuity of the piezo voltage u (t) can be detected, for example, via the time derivative of the piezo voltage u '(t).
  • a detection circuit is therefore, for example, a differentiator with downstream threshold detection in question.
  • the detected discontinuity of the piezoelectric voltage u (t) at the time t c that is the impact time of the valve needle 48, can now be assigned to a known auxiliary variable in time, for example an SOI signal which changes its value at the time t SOI to trigger the start of injection ,
  • the time interval between the time t SOI and the time t c corresponds in this case, the time between the start of energization and the actual start of delivery of the pump-nozzle unit.
  • FIG. 5 shows the course of the piezoelectric voltage for an injection process with different piezoelectric energies.
  • the individual curves from top to bottom correspond to the voltage values 150 V, 140 V, 130 V, 120 V, 110 V and 100 V.
  • FIG. 6 shows a detail of the curves of FIG. 5 with impact times of the valve needle 48 during the closing process of the piezo control valve 22 based on a known SOI signal.
  • the illustration of FIG. 6 shows that the impact time t c for lower piezo voltages u (FIG. t) moves backwards.
  • the impact time t C1 corresponds to the voltage of 150 V
  • the impact time t C2 corresponds to the voltage of 100 V.
  • the impact times t C1 and t C2 can be set again in time with respect to the SOI signal.
  • FIG. 7 shows the course of the piezo voltage u (t), of the piezostream i (t) and of the valve needle stroke h (t), in particular also for the opening operation of the piezo control valve 22. Furthermore, the charge profile q (t), which is of no interest here, is shown .
  • the valve mechanism can not follow the receding piezoelectric actuator 76 non-positively. Nevertheless, the valve needle 48 is accelerated so much during the opening process by the Abêtpuls that occurs when hitting the already in its initial position piezoelectric actuator 76 at the time t o a mechanical force pulse.
  • the invention can be summarized as follows: The detection of the impact time of the valve needle 48 of a piezo control valve 22 of a pump-nozzle unit when closing and / or opening the piezo control valve 22 is carried out according to the invention by the piezo voltage u (t) and / or piezoelectric current i (t) are evaluated. This evaluation can in particular include the detection of discontinuities and / or pulses in the course of the piezo voltage u (t) and / or the piezoelectric current i (t). The detected impact time can be brought in an advantageous manner in temporal relation to a known auxiliary size, in particular for regulatory purposes.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne la détection du moment d'impact du pointeau (48) d'une soupape de commande piézo-électrique (22) d'une unité gicleur de pompe lors de la fermeture et/ou de l'ouverture de la soupape de commande piézo-électrique (22). A cet effet, on évalue la piézotension (u(t)) et/ou le piézocourant (i(t)). Cette évaluation peut notamment comporter l'identification de discontinuités et/ou d'impulsions dans le cours de la piézotension (u(t)) et/ou du piézocourant (i(t)). Le moment d'impact détecté peut avantageusement être mis en relation temporelle avec une grandeur auxiliaire connue (SOI, EOI), notamment à des fins de réglage.

Claims (15)

  1. Procédé pour la détection du moment d'impact du pointeau de soupape (48) d'une soupape de commande piézo-électrique (22) d'une unité pompe-injecteur, la détection du moment d'impact du pointeau de soupape (48) s'effectuant par l'analyse de la tension piézo-électrique (u (t)),
    caractérisé en ce que,
    l'analyse de la tension piézo-électrique (u (t)) comprend la détection d'au moins une discontinuité dans le tracé de la tension piézo-électrique (u (t)),
    en ce que le moment d'impact est reconnu par la détermination d'un point de discontinuité dans la tension piézo-électrique (u (t)), un circuit de détection étant utilisé avec un différenciateur avec détection de valeur seuil en aval.
  2. Procédé selon la revendication 1,
    caractérisé en ce que,
    l'analyse de la tension piézo-électrique (u (t)) comprend la reconnaissance d'au moins une impulsion dans le tracé de la tension piézo-électrique (u (t)).
  3. Procédé selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce que,
    le moment d'impact détecté du pointeau de soupape (48) de la soupape de commande piézo-électrique (22) est rapporté à une grandeur auxiliaire temporelle connue, et en ce que le moment d'impact détecté est utilisé pour la commande et/ou le réglage du fonctionnement d'une soupape de commande piézo-électrique (22) d'une unité pompe-injecteur.
  4. Procédé selon la revendication 3,
    caractérisé en ce que la grandeur auxiliaire temporelle connue comprend un signal de commande (SOI, EOI), qui fixe le début ou la fin d'une injection de carburant.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'événement représente le début et/ou la fin de l'injection de carburant.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la pile piézo-électrique présente dans l'actionneur piézo-électrique respectivement l'élément piézo-électrique travaille comme capteur de déplacement respectivement capteur de force.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le début de transport de l'unité pompe-injecteur est déterminé en fonction du moment d'impact où la corrélation temporelle prédéfinie entre le début du transport et le moment d'impact est analysée pour différents états de fonctionnement du moteur à combustion interne.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le moment d'ouverture de la soupape de commande piézo-électrique est reconnu en fonction d'une impulsion dans le tracé de la tension piézo-électrique.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la détermination du moment d'impact et des autres événements sont utilisés pour le positionnement plus précis du pointeau de soupape aussi bien pour des courses complètes que pour des courses partielles.
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la durée s'écoulant entre le début de l'alimentation électrique de l'actionneur piézo-électrique et le moment d'impact sert à déterminer la réserve de force de siège de la soupape de commande.
  11. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le signal de mesure de l'actionneur piézo-électrique est superposé au signal d'actionnement.
  12. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que des discontinuités du tracé de la tension piézo-électrique sont reconnues par la dérivée temporelle de la tension piézo-électrique.
  13. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une différence de temps, qui dépend de la tension d'activation piézo-électrique prédéfinie (uc1, uc2), est reconnue depuis le début de l'alimentation électrique (tsoi) de l'actionneur piézo-électrique jusqu'au moment (tc1, tc2) de la reconnaissance du moment d'impact.
  14. Dispositif pour détecter le moment d'impact du pointeau de soupape (48) d'une soupape de commande piézo-électrique (22) d'une unité pompe-injecteur, la tension piézo-électrique (u (t)) étant analysée pour détecter le moment d'impact du pointeau de soupape (48),
    caractérisé en ce que,
    pour l'analyse de la tension piézo-électrique (u (t)), il est prévu un circuit de détection avec un différenciateur avec une détection de valeur seuil en aval, qui reconnaît une discontinuité dans le tracé de la tension piézo-électrique (u (t)) qui correspond au moment d'impact.
  15. Dispositif selon la revendication 14,
    caractérisé en ce que,
    l'analyse de la tension piézo-électrique (u (t)) comprend la reconnaissance de l'au moins une impulsion dans le tracé de la tension piézo-électrique (u (t)).
EP03720240A 2002-03-27 2003-03-26 Procede et dispositif de detection du moment d'impact du pointeau d'une soupape de commande piezoelectrique Expired - Lifetime EP1488088B1 (fr)

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DE10213874 2002-03-27
DE10213874 2002-03-27
PCT/DE2003/001006 WO2003081007A1 (fr) 2002-03-27 2003-03-26 Procede et dispositif de detection du moment d'impact du pointeau d'une soupape de commande piezoelectrique

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EP1488088A1 (fr) 2004-12-22
DE50307324D1 (de) 2007-07-05

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