EP1740813A1 - Procede pour determiner un temps de fermeture d'un element de fermeture et ensemble circuit - Google Patents

Procede pour determiner un temps de fermeture d'un element de fermeture et ensemble circuit

Info

Publication number
EP1740813A1
EP1740813A1 EP05729139A EP05729139A EP1740813A1 EP 1740813 A1 EP1740813 A1 EP 1740813A1 EP 05729139 A EP05729139 A EP 05729139A EP 05729139 A EP05729139 A EP 05729139A EP 1740813 A1 EP1740813 A1 EP 1740813A1
Authority
EP
European Patent Office
Prior art keywords
voltage
closing
time
values
valve
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.)
Granted
Application number
EP05729139A
Other languages
German (de)
English (en)
Other versions
EP1740813B1 (fr
Inventor
Christian Rissler
Jörg BEILHARZ
Hans-Jörg Wiehoff
Sven Rebeschiess
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1740813A1 publication Critical patent/EP1740813A1/fr
Application granted granted Critical
Publication of EP1740813B1 publication Critical patent/EP1740813B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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

Definitions

  • the invention relates to a method for determining a closing time of a closing element according to the preamble of patent claim 1 and a circuit arrangement for determining the closing time of a closing element according to the preamble of patent claim 5.
  • a pump-nozzle system uses valves that are actuated with a piezoelectric actuator.
  • determining the closing time of the valve, with which the hydraulic pressure is set, is an important parameter that must be precisely recorded and controlled.
  • DE 199 30 309 C2 discloses a method and a device for regulating the injection quantity in a fuel injection valve with a piezo element actuator.
  • the fuel injection valve has a control chamber which is connected to a high-pressure accumulator and to a control valve. Pressures prevailing in the control chamber act on a movable nozzle body with a nozzle needle for opening and closing injection holes.
  • the control valve is actuated by the piezoelectric actuator.
  • the voltage at the piezoelectric actuator is recorded after its initial charging and the start of injection and / or the needle opening time of the injection valve is determined from the measured voltage.
  • the object of the invention is to provide a robust and precise method for determining the closing time of the closing element of the piezoelectrically driven valve.
  • the object of the invention is a To provide circuit device with which the closing time of the valve driven by the piezoelectric actuator can be determined in a simple manner.
  • the object of the invention is achieved by the method according to claim 1 and by the circuit arrangement according to claim 5.
  • An advantage of the method according to the invention is that the closing time of the valve can be determined precisely.
  • a comparison line is placed between a start and an end point of a measurement interval and the voltage applied to the piezoelectric actuator is recorded during the measurement interval. Difference values are determined between the measured voltage values and the comparison line, and the closing time is recognized at the point in time at which the difference value has the greatest value within the measurement interval.
  • the measured voltage values are further processed as squared quantities. This enables precise detection of the closing time.
  • a closing time is only recognized if the difference value exceeds a specified comparison value. In this way it is avoided that a closing time is recorded for a valve that is not closed.
  • a closing time is only recognized when the sum of the difference values of the measurement interval exceeds a predetermined comparison sum. This one too The prerequisite is to reliably detect a closing time.
  • Figure 1 is a schematic representation of an injection valve, which is designed according to the pump-nozzle principle
  • FIG. 2 shows a schematic program sequence for determining the closing time
  • FIG. 3 measurement curve of the voltage applied to the actuator during a closing process of the valve
  • Figure 4 shows the measurement curve with a reference curve
  • FIG. 5 shows a difference curve which is formed from the measurement curve and the reference curve
  • FIG. 6 shows a detailed illustration of the circuit arrangement which is used to record the closing time
  • FIG. 1 shows schematically the structure of a pump-nozzle unit.
  • the pump-nozzle unit is used to supply fuel into a combustion chamber 1 of an internal combustion engine.
  • the pump-nozzle unit has a pump 2, which compresses fuel via a piston 3, which is guided in a cylinder 4.
  • the piston 3 is driven directly or indirectly via a camshaft, not shown, of the internal combustion engine.
  • a first pressure chamber 5 is formed in the cylinder 4 adjacent to the piston 3.
  • the first pressure chamber 5 is connected to a valve 7 via a fuel line 6.
  • the valve 7 serves to either close the fuel line 6 or to connect it to a low-pressure region 8.
  • the pressure chamber 5 is also connected to an injection chamber 10 via a second fuel line 9.
  • a nozzle needle 11 is arranged in the injection chamber 10, the closing surfaces of which are assigned to a sealing seat 41.
  • the sealing seat 41 is arranged between the injection holes 12 and the injection space 10.
  • the nozzle needle 11 has pressure surfaces 13.
  • the nozzle needle 11 is biased by a fuel pressure in the injection chamber 10 against a closing direction away from the sealing seat 41.
  • the nozzle needle 11 is biased by a spring element 15 onto the sealing seat 41 via a pressure pin 14.
  • the valve 7 has a closing member 16 which is assigned to a valve sealing seat 17.
  • the closing member 16 is operatively connected to a piezoelectric actuator 18 which is controlled by a control unit 19.
  • the low pressure area 8 is for this purpose with a
  • Fuel tank connected. When the piston 3 compresses downward, the fuel is pressed back into the low-pressure region 8 with the valve 7 open.
  • the fuel lines, the injection chamber 10 and the second fuel line 9 are completely filled with power.
  • valve 7 is closed by the control unit 19 and the piezoelectric actuator 18 in a compression stroke in which the piston 3 moves downward.
  • the piston 3 compresses
  • Fuel does not escape through the low pressure area 8, but a high pressure is generated in the injection chamber 10.
  • the high pressure lifts the nozzle needle 11 from the associated sealing seat 41. Consequently, fuel is injected from the injection space 10 into the combustion space 1 through the injection holes 12
  • valve 7 If the valve 7 is opened, ie the closing member 16 is lifted from the associated sealing seat 17 by the piezoelectric actuator 18, the fuel pressure in the fuel line 6 and thus also in the injection space 10 drops. Consequently, the nozzle needle 11 is pressed onto the sealing seat again and the Connection between the injection space 10 and the injection holes 12 closed. This ends the injection.
  • the voltage applied to the piezoelectric actuator 18 is evaluated for a precise determination of the point in time at which the valve 7 with the closing member 16 is pressed onto the valve sealing seat 17 again.
  • the piezoelectric actuator 18 is supplied with voltage by the control device 19 via voltage lines 20.
  • the control unit 19 detects the voltage applied to the piezoelectric actuator via the voltage lines 20.
  • the control device 19 thus has both a voltage source and a voltage meter.
  • the control device 19 is connected to a data memory 42.
  • the valve 7 is designed in such a way that, when the piezoelectric actuator 18 is not energized, the closing member 16 is lifted off the valve sealing seat 17 and the valve 7 is thus open.
  • FIG. 2 shows a schematic program sequence for carrying out the method.
  • control unit 19 detects various operating states, such as, for. B. the speed of the internal combustion engine and the driver's request and then determines the start of the injection and the duration of the injection. For this purpose, the control device 19 accesses corresponding data and characteristic curves that are stored in the data memory 42.
  • the control device 19 applies a corresponding voltage to the piezoelectric actuator 18 via the voltage lines 20. The piezoelectric actuator 18 then expands and presses the closing member 16 onto the valve sealing seat 17 during a compression stroke of the piston 3.
  • the control unit 19 monitors the voltage applied to the piezoelectric actuator 18 in parallel with the application of the voltage to the piezoelectric actuator 18 , For this purpose, the control device 19 detects the voltage at the specified time intervals Actuator 18 is present. A diagram with a corresponding measurement curve is shown in FIG. 3.
  • FIG. 3 shows the measurement curve which results from the detected voltage values and which is stored by the control device 19 in the data memory 42.
  • the control device 19 determines a start point TS and an end point TE of a measurement interval in the measurement curve.
  • the starting point TS is preferably preset and is a predetermined time after the start of energizing the piezoelectric actuator.
  • the end point is also preferably preset and is a predetermined second time after the start of energizing the piezoelectric actuator.
  • the control unit 19 also calculates a comparison line between the measured value of the start point and the measured value of the end point.
  • the control device 19 determines the difference value for the corresponding value of the reference curve for each measured voltage value in the measurement interval between the start point and the end point. For this purpose, the measured voltage value and the value of the reference curve belonging to the same point in time are subtracted from one another.
  • the control unit 19 stores the difference values in the memory 21.
  • FIG. 4 shows a corresponding measurement diagram in which the starting point TS and the end point TE are shown.
  • the comparison line VG is shown in the form of a line with asterisks.
  • the measured values of the voltage of the piezoelectric actuator detected by the control device 19 are shown in the form of crosses and an approximated line MW.
  • the control unit 19 preferably uses squared voltage values, since this enables the closing time to be determined more precisely.
  • the control device 19 determines the largest difference value between a measured voltage value and the simultaneous value of the reference curve within the measurement interval and assigns the closing time of the valve 7 to the point in time at which the largest difference value occurred.
  • the closing time TF is also shown in the illustration in FIG. 4.
  • 5 shows the difference values between the measured voltage values and the temporal values of the comparison line, the difference values being determined on the basis of squared voltage values.
  • the following program point 57 additionally checks whether the calculated maximum difference value lies above a specified comparison value. If the comparison shows that the maximum difference value is not above the comparison value, no closing time of the valve 7 is recognized.
  • the specified comparison value was previously determined experimentally, for example. In this way, a malfunction of the valve 7 can be filtered out when determining the closing time.
  • control unit 19 forms the sum of the difference values and compares them with a comparison sum. If the comparison shows that the sum of the difference values is smaller than the comparison sum, then no closing time of the valve is recognized either.
  • the comparison sum is also preferably determined experimentally and is used to filter out malfunctions of the valve in which the valve does not close when the closing time is ascertained.
  • the comparison of the sum of the difference values with the comparison sum enables negative difference values at which the measured Filter out voltages above the comparison line, which, however, do not correspond to a closing of the valve.
  • the comparison sum is preferably determined experimentally for the respective pump-nozzle unit.
  • FIG. 6 shows a detailed illustration of the circuit arrangement, which is preferably embodied in the control device 19.
  • the voltage detected at the piezoelectric actuator 18 is fed via an input 21 and a linearization module 22 to a second input of a switch 23.
  • the detected voltage value is squared and fed to a second input of the switch 23 via an output.
  • An output of the switch 23 is connected to a first calculation block 24.
  • the first calculation block 24 limits the detection range in which the voltage is detected.
  • a start block 25 and an end block 26 are provided, each of which is connected to an input of the first calculation block 24 by a signal line.
  • the start block 25 contains a start time for the measurement, which is determined by the control unit 19.
  • the start time is passed on to the first calculation block 24.
  • the end block 26 contains an end time for the measurement, which is also determined by the control unit 19.
  • the end time is passed on to the first calculation block 24.
  • an entire injection process is recorded with a large number of measurement values, ie voltage values. For example, 40 measured values are recorded, which have a fixed time interval and are numbered with a consecutive index. The time of the measurement can be determined from the start time, the specified time interval and the index.
  • the first calculation block 24 passes on the voltage values supplied by the switch 23, which represent an entire measurement curve, as shown in FIG. 4, via a first output 27 to a second calculation block 29.
  • the second calculation block 29 determines on the basis of the supplied chip voltage values within the measurement interval which represent the comparison line according to FIG. 4.
  • the second calculation block 29 passes on the voltage reference values to an adder 30 via an output.
  • the linearized or non-linearized voltage values of a measurement curve with a negative sign are fed from the switch 23 to the adder unit 30.
  • Difference values for simultaneous voltage values and reference voltage values of the measurement curve are formed in the adder unit 30 and are supplied to an input of a third and a fourth calculation block 31, 32 via an output of the adder unit 30.
  • the maximum difference value is determined within the measurement interval determined by the start time and the end time and fed to a fifth calculation block 34 via an output.
  • the time of the maximum difference value and thus the closing time of the valve is calculated on the basis of the index of the maximum difference value and passed on to the control unit 19 via an output.
  • each index is assigned a time value in an assignment table.
  • a second output 35 of the third calculation block 31 outputs the maximum difference value to a comparison device 36.
  • a first memory field 37 is provided, in which a minimum comparison value is defined. The minimum comparison value has been determined experimentally.
  • the first memory field 37 specifies a minimum voltage difference value which is fed to a second input of the comparison device 36.
  • the comparison device 36 compares whether the maximum difference value is greater than or equal to the minimum difference value and forwards a signal via an output to a second comparison device 38 if this condition is met.
  • the fourth calculation block 32 sums the difference values of the individual measurement points within the measurement interval Measurement curve and passes on a sum difference value via an output to a third comparison device 39.
  • the third comparison device 39 is connected with a second input to an output of a second memory field 40. A minimal sum is stored in the second memory field 40 and is fed to the third comparison device 39.
  • the third comparison device 39 compares the difference sum calculated by the fourth calculation block 32 with the minimum sum that is stored in the memory field 40. If the comparison of the third comparison device 39 reveals that the difference sum is greater than or equal to the minimum sum, a signal is emitted to the second comparison device 38. If the comparison device 38 detects two signals at the two inputs, the second comparison device 38 sends an enable signal to the control signal 19, which confirms the validity of the detected closing time.

Landscapes

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

Abstract

L'invention concerne un procédé pour déterminer le temps de fermeture d'une soupape actionnée par un actionneur piézoélectrique. Pour l'enregistrement du temps de fermeture, la tension appliquée à l'actionneur piézoélectrique est enregistrée et l'instant où la tension enregistrée présente une valeur de différence maximale par rapport à une courbe de comparaison est déterminé. La courbe de différence est formée entre un point de début et un point de fin d'une courbe de mesure, qui contient les valeurs de tension appliquées à l'actionneur piézoélectrique. Ainsi, une détermination précise du temps de fermeture peut être effectuée.
EP05729139A 2004-04-28 2005-03-26 Procede pour determiner un temps de fermeture d'un element de fermeture et ensemble circuit Expired - Fee Related EP1740813B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004020937A DE102004020937B4 (de) 2004-04-28 2004-04-28 Verfahren zum Bestimmen einer Schließzeit eines Schließgliedes und Schaltungsanordnung
PCT/EP2005/003223 WO2005108765A1 (fr) 2004-04-28 2005-03-26 Procede pour determiner un temps de fermeture d'un element de fermeture et ensemble circuit

Publications (2)

Publication Number Publication Date
EP1740813A1 true EP1740813A1 (fr) 2007-01-10
EP1740813B1 EP1740813B1 (fr) 2011-07-06

Family

ID=34963343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05729139A Expired - Fee Related EP1740813B1 (fr) 2004-04-28 2005-03-26 Procede pour determiner un temps de fermeture d'un element de fermeture et ensemble circuit

Country Status (5)

Country Link
US (1) US7413160B2 (fr)
EP (1) EP1740813B1 (fr)
CN (1) CN100564847C (fr)
DE (1) DE102004020937B4 (fr)
WO (1) WO2005108765A1 (fr)

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US7520266B2 (en) * 2006-05-31 2009-04-21 Caterpillar Inc. Fuel injector control system and method
DE102006033932B4 (de) 2006-07-21 2018-06-14 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine
DE102006058742A1 (de) * 2006-12-12 2008-06-19 Robert Bosch Gmbh Verfahren zum Betreiben eines Kraftstoffeinspritzventils
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DE102010041320B4 (de) * 2010-09-24 2021-06-24 Vitesco Technologies GmbH Bestimmung des Schließzeitpunkts eines Steuerventils eines indirekt angetriebenen Kraftstoffinjektors
DE102010063099A1 (de) 2010-12-15 2012-06-21 Robert Bosch Gmbh Verfahren zum Betreiben einer Kraftstoffeinspitzanlage einer Brennkraftmaschine
DE102012209965A1 (de) * 2012-06-14 2013-12-19 Robert Bosch Gmbh Verfahren zum Betreiben eines Ventils
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DE102013214412B4 (de) * 2013-07-24 2016-03-31 Continental Automotive Gmbh Ermittlung des Zeitpunkts eines vorbestimmten Öffnungszustandes eines Kraftstoffinjektors
DE102014208753B4 (de) 2014-05-09 2016-03-31 Continental Automotive Gmbh Ermittlung von Parameterwerten für einen Kraftstoffinjektor
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US10352264B2 (en) * 2015-07-09 2019-07-16 Hitachi Automotive Systems, Ltd. Fuel injector control device
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Also Published As

Publication number Publication date
CN100564847C (zh) 2009-12-02
DE102004020937A1 (de) 2005-11-24
CN101010503A (zh) 2007-08-01
WO2005108765A1 (fr) 2005-11-17
US7413160B2 (en) 2008-08-19
US20070251492A1 (en) 2007-11-01
EP1740813B1 (fr) 2011-07-06
DE102004020937B4 (de) 2010-07-15

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