EP1472454B1 - Method and device for detecting operating states of a pump-nozzle unit - Google Patents
Method and device for detecting operating states of a pump-nozzle unit Download PDFInfo
- Publication number
- EP1472454B1 EP1472454B1 EP03708014A EP03708014A EP1472454B1 EP 1472454 B1 EP1472454 B1 EP 1472454B1 EP 03708014 A EP03708014 A EP 03708014A EP 03708014 A EP03708014 A EP 03708014A EP 1472454 B1 EP1472454 B1 EP 1472454B1
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- EP
- European Patent Office
- Prior art keywords
- piezo
- voltage
- pressure
- fuel
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 238000000034 method Methods 0.000 title claims description 22
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 239000000446 fuel Substances 0.000 description 57
- 238000002347 injection Methods 0.000 description 20
- 239000007924 injection Substances 0.000 description 20
- 238000002485 combustion reaction Methods 0.000 description 14
- 230000001419 dependent effect Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000000418 atomic force spectrum Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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- 239000002800 charge carrier Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
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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
- 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
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- 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
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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
- 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
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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
- 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
- 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
-
- 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
- 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
Definitions
- the invention relates to a method for detecting the hydraulic control and / or the mechanical coupling of a piezo-control valve having a pump-nozzle unit. Furthermore, the invention relates to a device for controlling a piezo control valve of a pump-nozzle unit and for detecting the hydraulic control and / or the mechanical coupling of the pump-nozzle unit.
- the mechanical coupling may include, for example, a striking of a valve pressure plate or a needle.
- 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 a At least from the currently prevailing pressures influenced opening force 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.
- the time profile of the mass flow during the injection can be advantageously controlled. 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 comprises a fuel pump piston which can be moved back and forth in a fuel pump cylinder and which is driven either directly by a tappet or indirectly via rocker arms by 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. Farther also requires the construction of the magnetic field to generate the tightening time.
- a equipped with a solenoid valve pump-nozzle unit is for example from the EP 0 277 939 B1 known.
- the problem may arise in particular at lower engine speeds that, due to a rapid opening of the piezo control valve and the abrupt deactivation of the highly compressed fuel caused thereby, a pressure wave is produced which has an unpleasant effect on the engine noise.
- a pump nozzle unit and a method for controlling fuel metering in an internal combustion engine is known.
- a valve is used to control the fuel flow into the internal combustion engine, wherein the valve is controlled by means of an actuating element so that it prevents the fuel flow in a first position and that it completely releases the fuel flow in a second position.
- the actuating element is driven in such a way that the valve occupies at least one intermediate position.
- a control circuit for driving a piezoelectric element is known. Furthermore, an error detection unit is provided, which detects a malfunction of the piezoelectric element in response to the voltage of the control circuit and outputs an error signal.
- the invention has the object of developing the generic methods and devices such that the detection of the hydraulic control of the pump-nozzle unit, with a relatively low hardware and / or software cost is made possible.
- the inventive method is based on the generic state of the art in that the detection is performed by comparing only the piezo voltage with at least one predetermined threshold.
- F is the pressure on the piezoelectric element
- u the piezoelectric voltage
- i the piezoelectric current
- c1 is a first constant
- c2 is a second constant
- t is the time.
- the piezo control valve can be opened throttled, for example, to avoid the problem explained above.
- the Hochscherab capitaung runs then slower and thus quieter.
- the piezo control valves generally have high sensitivity in throttled operation on. For throttled opening, therefore, a highly accurate positioning of the control valve is advantageous.
- Such a highly accurate positioning of the control valve can be achieved for example by a piezo-controlled control valve actuator with appropriate control. Also, for such a regulation, it is necessary to detect the force curve or the time of the beginning of the hydraulic control, which can also be done in the manner according to the invention. 6
- the detection of the operating state is performed by comparing the piezo voltage with at least one predetermined threshold while an at least substantially constant piezoelectric current is forced.
- the at least substantially constant piezoelectric current is approximately zero amperes.
- the output of the piezoelectric element driving device can be decoupled from the piezoelectric element or terminated high impedance. In this case, an exchange of the induced charge carriers by force is not possible.
- the detection of the operating state is performed by comparing the piezo voltage with at least one predetermined threshold value after the piezo voltage has been maintained at an at least substantially constant value.
- the at least substantially constant value of the piezoelectric voltage is smaller than a piezoelectric voltage previously used for driving the piezo control valve and greater than zero volts.
- the piezoelectric element is discharged after a stepped discharge to a certain level and maintained at this level for a predetermined holding phase. During this holding phase, the control is decoupled or closed high-impedance, so that no charge exchange takes place.
- the simplified relationship of formula 3 is valid.
- the further determination of the force jump (formula 4) is only possible with difficulty because the partial discharge level is not known exactly.
- the voltage-dependent constant c1 must be taken into account in this case as polynomial 1st order in the differentiation, which can be done for example via a stored map.
- the device according to the invention builds on the generic state of the art in that it performs the detection of the operating state by comparing the piezo voltage with at least one predetermined threshold, wherein an at least substantially constant piezoelectric current is enforced.
- the device performs the detection of the operating state by comparing the piezo voltage with at least one predetermined threshold while it forces an at least substantially constant piezoelectric current.
- the at least substantially constant piezoelectric current is approximately zero amperes.
- the device performs the detection of the operating state by comparing the piezo voltage with at least one predetermined threshold value after it has kept the piezo voltage at an at least substantially constant value.
- the at least substantially constant value of the piezoelectric voltage is smaller than a piezoelectric voltage previously used for driving the piezo control valve and greater than zero volts.
- the circuit design is preferably adapted so that the piezoelectric actuator is short-circuited during the detection phase or terminated high-impedance.
- a force jump can then be represented directly by the current profile or by the differentiated voltage.
- FIG. 1 schematically shows 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 the piezo control valve 22 to be triggered according to the invention.
- 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 piezo control valve 22 In the open rest position of the piezo control valve 22 is at a relative to FIG. 1 upward movement of the fuel pump piston 14 10 fuel sucked from the low-pressure fuel area 18 into the first pressure chamber 28. If the piezo control valve 22 is based on a FIG. 1 downwardly directed movement of the fuel pump piston 14 is still in its open rest position, previously sucked into the first pressure chamber 28 fuel 10 can be pressed back into the low-pressure fuel area 18 again. With a suitable control of the piezo control valve 22 closes, this is the fuel line 20.
- the illustrated unit injector further includes a fuel injector, generally designated 24. the one between a closed position and an open position back and forth movable nozzle needle 46 has.
- a pressure pin 26 may, based on the representation of FIG. 1 , in particular exert a downward force on the nozzle needle 46.
- a dial 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 a based on the representation of FIG.
- 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 shim 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 exercises a relative to the representation of FIG. 1 upward opening force on the nozzle needle 46 from.
- 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 and holding valve 34 may be provided between the first pressure chamber 28 and the second pressure chamber 30 in the second pressure chamber 30 to limit and maintain suitable values p 30 .
- the illustrated pump-nozzle unit can be monitored by the method according to the invention for operating states of interest, for example a triggering pulse which results when the fuel injection into the combustion chamber 12 is ended.
- an embodiment of the device 80 according to the invention can be used in an advantageous manner, which controls the piezoelectric element of the piezo control valve 22.
- FIG. 2 shows a schematic partial sectional view of a piezo control valve 22, which with the pump-nozzle unit after FIG. 1 can be used.
- the illustrated piezo control valve 22 has a movable element 48 in the form of a valve needle, 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, based on the representation is shifted to the right.
- 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 is connected to the in FIG. 1 shown fuel line 20 is in communication.
- the piezo control valve 22 has 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 on a second axial end surface 72 of the valve needle 48 to the from the piezoelectric element 76 generated to transmit transmitted force 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 communicates with a discharge chamber 50, which continues to communicate with an actuator chamber 74 located in front of the piezoelectric element 76 via a compensation bore 52.
- This actuator chamber 74 is in communication with a return 60, via which fuel can flow back out of the actuator chamber 74.
- the piezo element 76 can be controlled by the first, second or third embodiment of the device according to the invention such that the first, second or third embodiment of the method according to the invention is carried out, resulting in the explained in the following Figures 3 . 4 or 5 can show curves shown.
- FIG. 3 is the piezoelectric voltage u (t) initially increased linearly in an interval between the times t 1 and t 2 .
- the piezoelectric current i (t) first increases within this interval and then drops back to zero.
- the pressure p 38 in the high pressure chamber 38 increases.
- the piezoelectric voltage is kept approximately constant, wherein the piezoelectric current i (t) during this interval has the value zero.
- the pressure p 38 in the high-pressure chamber 38 continues to increase.
- the piezo voltage u (t) is reduced again to zero.
- the piezoelectric current i (t) first assumes a negative value and then rises again to zero.
- the pressure p 38 in the high-pressure chamber 38 initially increases even further and then begins to fall off.
- a piezo voltage u (t) of zero volts is forced.
- the control pulse caused by the hydraulic control of the piezostream i (t) can now be detected by comparing the piezoelectric current i (t) with a detection threshold.
- a detection signal for the tripping pulse is generated at the time t 5 .
- FIG. 3 thus illustrates a Abêtpulsdetetation by the piezoelectric current i (t) after complete discharge, which does not belong to the invention.
- FIG. 4 is the piezoelectric voltage u (t) initially increased linearly in an interval between the times t 1 and t 2 .
- the piezoelectric current i (t) first increases within this interval and then drops back to zero.
- the pressure p 38 in the high pressure chamber 38 increases.
- the piezoelectric voltage is kept approximately constant, wherein the piezoelectric current i (t) during this interval has the value zero.
- the pressure p 38 in the high-pressure chamber 38 continues to increase.
- the piezo voltage u (t) is reduced again to zero.
- the piezoelectric current i (t) first assumes a negative value and then rises again to zero.
- the pressure p 38 in the high-pressure chamber 38 initially increases even further and then begins to fall off.
- a piezoelectric current i (t) of zero is forced by a high-impedance termination.
- a tripping pulse generated by the tripping of the piezo voltage u (t) can now be compared with a detection threshold value for the piezo voltage.
- a detection signal for the tripping pulse is again generated, as shown in FIG FIG. 4 shown below.
- the curve of FIG. 4 thus corresponds to a Abgrespulsdetetation by the piezoelectric voltage u (t) after complete discharge.
- FIG. 5 is the piezoelectric voltage u (t) initially increased linearly in an interval between the times t 1 and t 2 .
- the piezoelectric current i (t) initially increases within this interval and then drops back to zero.
- the pressure p 38 in the high pressure chamber 38 increases.
- the piezoelectric voltage is kept approximately constant, wherein the piezoelectric current i (t) during this interval has the value zero.
- the pressure p 38 in the high-pressure chamber 38 continues to increase.
- the piezo voltage u (t) drops to a value> zero.
- the piezoelectric current i (t) assumes a negative value and then rises again to zero, while the pressure p 38 in the high-pressure chamber 38 continues to rise. From time t 4 , a piezoelectric current i (t) of zero is forced by a high-impedance termination.
- the piezo voltage u (t) therefore remains at the value that it had at time t 3 until the tripping pulse of the piezo voltage u (t) occurs.
- This tripping pulse can be detected by comparing the piezo voltage u (t) with a detection threshold value, in which case the detection threshold value must have a higher value than the piezo voltage u (t) had at time t 3 .
- a detection of the hydraulic control of a piezo-control valve having a pump-nozzle unit is performed according to the invention by the piezoelectric voltage is compared with at least one predetermined threshold. For this purpose, during the detection phase for the not used for comparison piezoelectric current an at least substantially constant value of preferably zero is enforced.
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Abstract
Description
Die Erfindung betrifft ein Verfahren zur Detektion der hydraulischen Absteuerung und/oder der mechanischen Kopplung einer ein Piezo-Steuerventil aufweisenden Pumpe-Düse-Einheit. Weiterhin betrifft die Erfindung eine Vorrichtung zur Ansteuerung eines Piezo-Steuerventils einer Pumpe-Düse-Einheit und zur Detektion der hydraulischen Absteuerung und/oder der mechanischen Kopplung der Pumpe-Düse-Einheit. Die mechanische Kopplung kann dabei beispielsweise ein Aufschlagen einer Ventildruckplatte beziehungsweise einer Nadel umfassen.The invention relates to a method for detecting the hydraulic control and / or the mechanical coupling of a piezo-control valve having a pump-nozzle unit. Furthermore, the invention relates to a device for controlling a piezo control valve of a pump-nozzle unit and for detecting the hydraulic control and / or the mechanical coupling of the pump-nozzle unit. The mechanical coupling may include, for example, a striking of a valve pressure plate or a needle.
Pumpe-Düse-Einheiten dienen zum Zuführen von Kraftstoff in einen Verbrennungsraum einer Brennkraftmaschine. Dabei kann es sich beispielsweise um eine Pumpe-Düse-Einheit mit einer Steuer- und/oder regelbaren Kraftstoffpumpe, einer Kraftstoffeinspritzdüse, die eine zwischen einer Schließstellung und einer Öffnungsstellung hin und her bewegliche Düsennadel aufweist, einem ersten Druckraum, der von der Kraftstoffpumpe mit unter einem ersten Druck stehenden Kraftstoff befüllbar ist, einem zweiten Druckraum, wobei in dem zweiten Druckraum unter einem zweiten Druck stehender Kraftstoff eine Schließkraft auf die Düsennadel ausübt, und einen dritten Druckraum, der mit dem ersten Druckraum kommuniziert, wobei in dem dritten Druckraum unter einem dritten Druck stehender Kraftstoff eine Öffnungskraft auf die Düsennadel ausübt, handeln.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.
Pumpe-Düse-Einheiten werden insbesondere im Zusammenhang mit druckgesteuerten Einspritzsystemen verwendet. Ein wesentliches Merkmal eines druckgesteuerten Einspritzsystems besteht darin, dass die Kraftstoffeinspritzdüse öffnet, sobald eine zumindest vom aktuell herrschenden Drücken beeinflusste Öffnungskraft auf die Düsennadel ausgeübt wird. Derartige druckgesteuerte Einspritzsysteme dienen der Kraftstoffdosierung, der Kraftstoffaufbereitung, der Formung des Einspritzverlaufs und einer Abdichtung der Kraftstoffzuführung gegen den Verbrennungsraum der Brennkraftmaschine. Mit druckgesteuerten Einspritzsystemen lässt sich der zeitliche Verlauf des Mengenstroms während der Einspritzung in vorteilhafter Weise steuern. Damit kann ein positiver Einfluss auf die Leistung, den Kraftstoffverbrauch und die Schadstoffemission des Motors genommen werden.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 a At least from the currently prevailing pressures influenced opening force 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. With pressure-controlled injection systems, the time profile of the mass flow during the injection can be advantageously controlled. This can have a positive influence on the engine's performance, fuel consumption and pollutant emission.
Bei Pumpe-Düse-Einheiten sind die Kraftstoffpumpe und die Kraftstoffeinspritzdüse in der Regel als integriertes Bauteil ausgebildet. Für jeden Verbrennungsraum der Brennkraftmaschine wird zumindest eine Pumpe-Düse-Einheit vorgesehen, die in der Regel in den Zylinderkopf eingebaut wird. Die Kraftstoffpumpe umfasst dabei typischerweise einen in einem Kraftstoffpumpenzylinder hin und her beweglichen Kraftstoffpumpenkolben, der entweder direkt über einen Stößel oder indirekt über Kipphebel von einer Nockenwelle der Brennkraftmaschine angetrieben wird. Der üblicherweise den ersten Druckraum bildende Abschnitt des Kraftstoffpumpenzylinders ist über ein Steuerventil mit einem Kraftstoff-Niederdruckbereich verbindbar, wobei bei geöffnetem Steuerventil Kraftstoff von dem Kraftstoff-Niederdruckbereich in den ersten Druckraum angesaugt und bei weiterhin geöffnetem Steuerventil von dem ersten Druckraum in den Kraftstoff-Niederdruckbereich zurückgedrückt wird. Sobald das Steuerventil geschlossen wird, erfolgt durch den Kraftstoffpumpenkolben eine Komprimierung des in dem ersten Druckraum befindlichen Kraftstoffs und somit ein Druckaufbau. Es ist bekannt, das Steuerventil in Form eines Magnetventils vorzusehen. Magnetventile weisen jedoch üblicherweise eine relativ lange Ansprechzeit auf, was insbesondere dadurch bedingt ist, dass der Magnetanker eines Magnetventils aufgrund der von seiner Masse abhängigen Massenträgheitskräfte nicht beliebig schnell beschleunigt werden kann. Weiterhin erfordert auch der Aufbau des Magnetfeldes zur Erzeugung der Anzugskraft Zeit. Eine mit einem Magnetventil ausgestattete Pumpe-Düse-Einheit ist beispielsweise aus der
Um die durch die Verwendung von Magnetventilen hervorgerufenen Probleme zu vermeiden, ist es weiterhin bereits bekannt, Pumpe-Düse-Einheiten mit einem Steuerventil auszustatten, das piezoelektrisch betrieben wird. Eine derartige Pumpe-Düse-Einheit ist beispielsweise aus der
Um bei einem Einspritzvorgang neben einer Haupteinspritzmenge eine zusätzliche Voreinspritzmenge und/oder eine zusätzliche Nacheinspritzmenge in den Verbrennungsraum einzubringen, ist es weiterhin bekannt, während eines Einspritzzyklus mehrere in kurzen Zeitabständen aufeinanderfolgende Einspritzimpulse auszulösen.In order to introduce an additional pre-injection quantity and / or an additional post-injection quantity into the combustion chamber during an injection process in addition to a main injection quantity, it is also known to trigger a plurality of injection pulses consecutive in short time intervals during one injection cycle.
Bei Pumpe-Düse-Einheiten mit einem Piezo-Steuerventil kann insbesondere bei niedrigeren Motordrehzahlen das Problem auftreten, dass durch ein schnelles Öffnen des Piezo-Steuerventils und die dadurch hervorgerufene schlagartige Absteuerung des hochverdichteten Kraftstoffs eine Druckwellen entsteht, die sich unangenehm auf das Motorgeräusch auswirkt.In the case of pump-nozzle units with a piezo control valve, the problem may arise in particular at lower engine speeds that, due to a rapid opening of the piezo control valve and the abrupt deactivation of the highly compressed fuel caused thereby, a pressure wave is produced which has an unpleasant effect on the engine noise.
Aus
Aus
Aus dem
Der Erfindung liegt die Aufgabe zugrunde, die gattungsgemäßen Verfahren und Vorrichtungen derart weiterzubilden, dass die Detektion der hydraulischen Absteuerung der Pumpe-Düse-Einheit, mit einem verhältnismäßig geringen Hard- und/oder Softwareaufwand ermöglicht wird.The invention has the object of developing the generic methods and devices such that the detection of the hydraulic control of the pump-nozzle unit, with a relatively low hardware and / or software cost is made possible.
Diese Aufgabe wird durch die Merkmale der unabhängigen Ansprüche gelöst.This object is solved by the features of the independent claims.
Vorteilhafte Ausgestaltungen.und Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.Advantageous embodiments and developments of the invention will become apparent from the dependent claims.
Das erfindungsgemäße Verfahren baut auf dem gattungsgemäßen Stand der Technik dadurch auf, dass die Detektion durch einen Vergleich von nur der Piezospannung mit zumindest einem vorgegebenen Schwellenwert durchgeführt wird. Allgemein ist der Kraftverlauf für ein Piezoelement durch die folgende Beziehung
gegeben, in der FDruck die Kraft auf das Piezoelement, u die Piezospannung, i den Piezostrom, c1 eine erste Konstante, c2 eine zweite Konstante und t die Zeit bezeichnet. Zu Auswertung der Formel 1 sind jedoch komplexe Schaltungen erforderlich, da sowohl die Piezospannung u(t) als auch der Piezostrom i(t) kombiniert erfasst werden müssen, um einen Kraftverlauf beziehungsweise einen Kraftsprung detektieren zu können. Die Auswertung der Formel 1 wird noch dadurch erschwert, dass die Konstanten c1 und c2 von der Spannung abhängige Größen sind, was den Hard- und Softwareaufwand weiter erhöht. Im Gegensatz dazu wird der für die Detektion des jeweils interessierenden Betriebszustandes erforderliche Hard- und Softwareaufwand durch die erfindungsgemäße Lösung deutlich verringert. Eine aufwendige Signalwandlung ist nicht erforderlich. Zusätzliche Toleranzen bei der Wandlung von u(t) und i(t) treten nicht auf. Somit kann beispielsweise der Zeitpunkt eines Kraftsprungs über eine einfache Schwellenwertschaltung ermittelt werden. Wenn die hydraulische Absteuerung detektiert wird, kann das Piezo-Steuerventil zur Vermeidung der eingangs erläuterten Problematik beispielsweise gedrosselt geöffnet werden. Die Hochdruckabsteuerung läuft dann langsamer und damit geräuschärmer ab. Die Piezo-Steuerventile weisen im gedrosselten Betrieb im Allgemeinen eine hohe Empfindlichkeit auf. Zum gedrosselten Öffnen ist daher eine hochgenaue Positionierung des Steuerventils vorteilhaft. Eine derartige hochgenaue Positionierung des Steuerventils kann beispielsweise durch einen piezogesteuerten Steuerventilsteller mit entsprechender Regelung erreicht werden. Auch für eine derartige Reglung ist es erforderlich, den Kraftverlauf beziehungsweise den Zeitpunkt des Beginns der hydraulischen Absteuerung zu detektieren, was ebenfalls auf die erfindungsgemäße Weise erfolgen kann. 6The inventive method is based on the generic state of the art in that the detection is performed by comparing only the piezo voltage with at least one predetermined threshold. Generally, the force curve for a piezoelectric element is by the following relationship
where F is the pressure on the piezoelectric element, u is the piezoelectric voltage, i is the piezoelectric current, c1 is a first constant, c2 is a second constant and t is the time. To evaluate the formula 1, however, complex circuits are required, since both the piezoelectric voltage u (t) and the piezoelectric current i (t) must be detected combined to detect a force curve or a force jump can. The evaluation of the formula 1 is made even more difficult by the fact that the constants c1 and c2 are voltage-dependent variables, which further increases the hardware and software costs. In contrast, the hardware and software required for the detection of the respective operating state of interest required by the inventive solution is significantly reduced. A complex signal conversion is not required. Additional tolerances in the conversion of u (t) and i (t) do not occur. Thus, for example, the time of a force jump can be determined via a simple threshold value circuit. If the hydraulic control is detected, the piezo control valve can be opened throttled, for example, to avoid the problem explained above. The Hochdruckabsteuerung runs then slower and thus quieter. The piezo control valves generally have high sensitivity in throttled operation on. For throttled opening, therefore, a highly accurate positioning of the control valve is advantageous. Such a highly accurate positioning of the control valve can be achieved for example by a piezo-controlled control valve actuator with appropriate control. Also, for such a regulation, it is necessary to detect the force curve or the time of the beginning of the hydraulic control, which can also be done in the manner according to the invention. 6
Bei der erfindungsgemäßen Ausführungsform des erfindungsgemäßen Verfahrens ist vorgesehen, dass die Detektion des Betriebszustandes durch einen Vergleich der Piezospannung mit zumindest einem vorgegebenen Schwellenwert durchgeführt wird während ein zumindest im Wesentlichen konstanter Piezostrom erzwungen wird.In the embodiment of the inventive method according to the invention, it is provided that the detection of the operating state is performed by comparing the piezo voltage with at least one predetermined threshold while an at least substantially constant piezoelectric current is forced.
Für diese Ausführungsform wird weiterhin bevorzugt, dass der zumindest im Wesentlichen konstante Piezostrom ungefähr Null Ampere beträgt. Zu diesem Zweck kann der Ausgang der das Piezoelement ansteuernden Vorrichtung vom Piezoelement entkoppelt beziehungsweise hochohmig abgeschlossen werden. Dabei ist ein Austausch der induzierten Ladungsträger bei Krafteinwirkung nicht möglich. Unter diesen Vorraussetzungen lässt sich die eingangs erwähnte Formel 1 wiederum erheblich vereinfachen und es ergibt sich der folgende Zusammenhang zwischen der Aktorkraft F(t) und der Piezospannung u(t):
wobei es sich bei der spannungsabhängigen Konstante c1 um ein Polynom 1. Ordnung c1 (u(t)) = a·u(t)+b handeln kann. Für geringe Aussteuerungen im Arbeitspunkt u=0 verbleibt in erster Näherung nur die spannungsunabhängige Konstante b. Der Kraftsprung Ḟ(t) ergibt sich dann wie folgt:
where the voltage-dependent constant c1 can be a polynomial of the first order c1 (u (t)) = a * u (t) + b. For low amplitudes at the operating point u = 0, only the voltage-independent constant b remains in the first approximation. The force jump Ḟ (t) then results as follows:
Somit kann beispielsweise ein Absteuerpuls über die Piezospannung u(t) nach vollständiger Entladung einfach detektiert werden.Thus, for example, a Absteuerpuls on the piezoelectric voltage u (t) after complete discharge can be easily detected.
Gemäß einer Weiterbildung des erfindungsgemäßen Verfahrens ist vorgesehen, dass die Detektion des Betriebszustandes durch einen Vergleich der Piezospannung mit zumindest einem vorgegebenen Schwellenwert durchgeführt wird nachdem die Piezospannung auf einem zumindest im Wesentlichen konstanten Wert gehalten wurde.According to a development of the method according to the invention, it is provided that the detection of the operating state is performed by comparing the piezo voltage with at least one predetermined threshold value after the piezo voltage has been maintained at an at least substantially constant value.
Dabei wird bevorzugt, dass der zumindest im Wesentlichen konstante Wert der Piezospannung kleiner als eine vorher zur Ansteuerung des Piezo-Steuerventils verwendete Piezospannung und größer als Null Volt ist. Bei dieser Ausführungsform wird das Piezoelement nach einer gestuften Entladung auf ein bestimmtes Niveau entladen und für eine vorgegebene Haltephase auf diesem Niveau gehalten. Während dieser Haltephase ist die Ansteuerung entkoppelt beziehungsweise hochohmig abgeschlossen, so dass kein Ladungsaustausch erfolgt. Damit sind wieder die vereinfachte Beziehung der Formel 3 gültig. Die weiterführende Bestimmung des Kraftsprungs (Formel 4) ist allerdings nur erschwert möglich, da das Teilentladungsniveau nicht exakt bekannt ist. Die spannungsabhängige Konstante c1 muss in diesem Fall als Polynom 1. Ordnung bei der Differenziation berücksichtigt werden, was beispielsweise über ein gespeichertes Kennfeld erfolgen kann.It is preferred that the at least substantially constant value of the piezoelectric voltage is smaller than a piezoelectric voltage previously used for driving the piezo control valve and greater than zero volts. In this embodiment, the piezoelectric element is discharged after a stepped discharge to a certain level and maintained at this level for a predetermined holding phase. During this holding phase, the control is decoupled or closed high-impedance, so that no charge exchange takes place. Thus again the simplified relationship of formula 3 is valid. However, the further determination of the force jump (formula 4) is only possible with difficulty because the partial discharge level is not known exactly. The voltage-dependent constant c1 must be taken into account in this case as polynomial 1st order in the differentiation, which can be done for example via a stored map.
Die erfindungsgemäße Vorrichtung baut auf dem gattungsgemäßen Stand der Technik dadurch auf, dass sie die Detektion des Betriebszustandes durch einen Vergleich von der Piezospannung mit zumindest einem vorgegebenen Schwellenwert durchführt, wobei ein zumindest im Wesentlichen konstanter Piezostrom erzwungen wird. Dadurch ergeben sich die im Zusammenhang mit dem erfindungsgemäßen Verfahren erläuterten Vorteile in gleicher oder ähnlicher Weise, weshalb zur Vermeidung von Wiederholungen auf die entsprechenden Ausführungen verwiesen wird.The device according to the invention builds on the generic state of the art in that it performs the detection of the operating state by comparing the piezo voltage with at least one predetermined threshold, wherein an at least substantially constant piezoelectric current is enforced. This results in the advantages explained in connection with the method according to the invention in the same or a similar manner, so reference is made to avoid repetition to the corresponding statements.
Gleiches gilt sinngemäß für die folgenden bevorzugten Ausführungsformen der erfindungsgemäßen Vorrichtung, wobei auch bezüglich der durch diese Ausführungsformen erzielbaren Vorteile auf die entsprechenden Ausführungen im Zusammenhang mit dem erfindungsgemäßen Verfahren verwiesen wird.The same applies mutatis mutandis to the following preferred embodiments of the device according to the invention, wherein also with respect to the achievable by these embodiments advantages Reference is made to the corresponding statements in connection with the method according to the invention.
Bei der erfindungsgemäßen Ausführungsform der Vorrichtung ist vorgesehen, dass sie die Detektion des Betriebszustandes durch einen Vergleich der Piezospannung mit zumindest einem vorgegebenen Schwellenwert durchführt während sie einen zumindest im Wesentlichen konstanten Piezostrom erzwingt.In the embodiment of the device according to the invention, it is provided that it performs the detection of the operating state by comparing the piezo voltage with at least one predetermined threshold while it forces an at least substantially constant piezoelectric current.
Bei dieser Ausführungsform ist vorzugsweise weiterhin vorgesehen, dass der zumindest im Wesentlichen konstante Piezostrom ungefähr Null Ampere beträgt.In this embodiment, it is further preferably provided that the at least substantially constant piezoelectric current is approximately zero amperes.
Bei einer Weiterbildung der erfindungsgemäßen Vorrichtung ist vorgesehen, dass sie die Detektion des Betriebszustandes durch einen Vergleich der Piezospannung mit zumindest einem vorgegebenen Schwellenwert durchführt nachdem sie die Piezospannung auf einem zumindest im Wesentlichen konstanten Wert gehalten hat.In a development of the device according to the invention, it is provided that it performs the detection of the operating state by comparing the piezo voltage with at least one predetermined threshold value after it has kept the piezo voltage at an at least substantially constant value.
Bei dieser Ausführungsform ist vorzugsweise weiterhin vorgesehen, dass der zumindest im Wesentlichen konstante Wert der Piezospannung kleiner als eine vorher zur Ansteuerung des Piezo-Steuerventils verwendete Piezospannung und größer als Null Volt ist.In this embodiment, it is further preferably provided that the at least substantially constant value of the piezoelectric voltage is smaller than a piezoelectric voltage previously used for driving the piezo control valve and greater than zero volts.
Der Erfindung liegt die Erkenntnis zugrunde, dass nur eine elektrische Größe zur Detektion erforderlich ist. Zu diesem Zweck wird das Schaltungsdesign vorzugsweise so angepasst, dass der Piezoaktor während der Detektionsphase kurzgeschlossen beziehungsweise hochohmig abgeschlossen ist. Beispielsweise ein Kraftsprung lässt sich dann direkt durch den Stromverlauf oder über die differenzierte Spannung darstellen.The invention is based on the finding that only one electrical variable is required for detection. For this purpose, the circuit design is preferably adapted so that the piezoelectric actuator is short-circuited during the detection phase or terminated high-impedance. For example, a force jump can then be represented directly by the current profile or by the differentiated voltage.
Die Erfindung wird nun unter Bezugnahme auf die beigefügten Zeichnungen anhand bevorzugter Ausführungsformen beispielhaft erläutert.The invention will now be described by way of example with reference to the accompanying drawings with reference to preferred embodiments.
Es zeigen:
- Figur 1
- eine schematische Ausführungsform einer Pumpe-Düse- Einheit bei beziehungsweise mit der das erfindungs- gemäße Verfahren beziehungsweise die erfindungsge- mäße Vorrichtung angewendet werden kann;
- Figur 2
- eine schematische Teil-Schnittansicht eines Piezo- Steuerventils das mit der Pumpe-Düse-Einheit nach
Figur 1 verwendet werden kann; - Figur 3
- einen Kurvenverlauf, der eine erste Ausführungsform des erfindungsgemäßen Verfahrens veranschaulicht, die nicht zur Erfindung gehört, wobei dieser Kur- venverlauf durch die erste Ausführungsform der er- findungsgemäßen Vorrichtung hervorgerufen werden kann;
- Figur 4
- einen Kurvenverlauf, der die Ausführungsform des erfindungsgemäßen Verfahrens veranschaulicht, wobei dieser Kurvenverlauf durch die zweite Ausführungs- form der erfindungsgemäßen Vorrichtung hervorgeru- fen werden kann; und
- Figur 5
- einen Kurvenverlauf, der eine Weiterbildung des er- findungsgemäßen Verfahrens veranschaulicht, wobei dieser Kurvenverlauf durch die dritte Ausführungs- form der erfindungsgemäßen Vorrichtung hervorgeru- fen werden kann.
- FIG. 1
- a schematic embodiment of a pump-nozzle unit at or with which the inventive method or the inventive device can be applied;
- FIG. 2
- a schematic partial sectional view of a piezo control valve with the pump-nozzle unit after
FIG. 1 can be used; - FIG. 3
- a curve illustrating a first embodiment of the method according to the invention, which does not belong to the invention, which curve can be caused by the first embodiment of the inventive device;
- FIG. 4
- a curve illustrating the embodiment of the method according to the invention, this curve can be caused by the second embodiment of the device according to the invention; and
- FIG. 5
- a curve that illustrates a development of the inventive method, this curve can be caused by the third embodiment of the device according to the invention.
Gemäß
Gemäß
Gemäß
Die Erfindung lässt sich wie folgt zusammenfassen: eine Detektion der hydraulischen Absteuerung einer ein Piezo-Steuerventil aufweisenden Pumpe-Düse-Einheit wird erfindungsgemäße durchgeführt, indem die Piezospannung mit zumindest einem vorgegebenen Schwellenwert verglichen wird. Zu diesem Zweck wird während der Detektionsphase für den nicht zum Vergleich herangezogenen Piezostrom ein zumindest im Wesentlichen konstanter Wert von vorzugsweise Null erzwungen.The invention can be summarized as follows: A detection of the hydraulic control of a piezo-control valve having a pump-nozzle unit is performed according to the invention by the piezoelectric voltage is compared with at least one predetermined threshold. For this purpose, during the detection phase for the not used for comparison piezoelectric current an at least substantially constant value of preferably zero is enforced.
Claims (8)
- Method for detection of the hydraulic shut-off and/or mechanical coupling as an operating state of a pump nozzle unit having a piezo control valve (22),
characterised in that
the detection of the operating state is performed by means of a comparison of the piezo voltage (u(t)) with at least one predefined threshold value, while an at least essentially constant piezo current (i(t)) is forcibly obtained. - Method according to claim 1,
characterised in that
the at least essentially constant piezo current (i(t)) is approximately zero amperes. - Method according to claim 1,
characterised in that
the detection of the at least one operating state is performed by means of a comparison of the piezo voltage (u(t)) with at least one predefined threshold value, after the piezo voltage (u(t)) has been held at an at least essentially constant value. - Method according to claim 3,
characterised in that
the at least essentially constant value of the piezo voltage (u(t)) is smaller than a piezo voltage (u(t)) previously used to shut off the piezo control valve (22) and is greater than zero volts. - Device for shutting off a piezo control valve (22) of a pump nozzle unit and for detection of the hydraulic shut-off and/or mechanical coupling of the pump nozzle unit as an operating state of the pump nozzle unit,
characterised in that
it is designed to perform the detection of the at least one operating state by means of a comparison of the piezo voltage (u(t)) with at least one predefined threshold value, while it forcibly obtains an at least essentially constant piezo current (i(t)). - Device according to claim 5,
characterised in that
the at least essentially constant piezo current (i(t)) is approximately zero amperes. - Device according to claim 5,
characterised in that
it is designed to perform the detection of the at least one operating state by means of a comparison of the piezo voltage (u(t)) with at least one predefined threshold value, after it has held the piezo voltage (u(t) at an at least essentially constant value. - Device according to claim 7,
characterised in that
the at least essentially constant value of the piezo voltage (u(t)) is smaller than a piezo voltage (u(t)) previously used to shut off the piezo control valve (22) and is greater than zero volts.
Applications Claiming Priority (3)
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DE10205113 | 2002-02-07 | ||
DE10205113 | 2002-02-07 | ||
PCT/DE2003/000297 WO2003067073A1 (en) | 2002-02-07 | 2003-02-03 | Method and device for detecting operating states of a pump-nozzle unit |
Publications (2)
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EP1472454A1 EP1472454A1 (en) | 2004-11-03 |
EP1472454B1 true EP1472454B1 (en) | 2009-08-12 |
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EP03708014A Expired - Lifetime EP1472454B1 (en) | 2002-02-07 | 2003-02-03 | Method and device for detecting operating states of a pump-nozzle unit |
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EP (1) | EP1472454B1 (en) |
DE (1) | DE50311804D1 (en) |
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DE10349307B3 (en) * | 2003-10-23 | 2005-05-25 | Siemens Ag | Diagnostic procedure for an electromechanical actuator |
DE102004020937B4 (en) * | 2004-04-28 | 2010-07-15 | Continental Automotive Gmbh | Method for determining a closing time of a closing element and circuit arrangement |
DE102004029906B4 (en) * | 2004-06-21 | 2017-01-19 | Continental Automotive Gmbh | Method and device for controlling an injection valve and computer program |
DE102004058971B4 (en) * | 2004-12-08 | 2006-12-28 | Volkswagen Mechatronic Gmbh & Co. Kg | Method for controlling a piezoelectric actuator and control unit for controlling a piezoelectric actuator |
DE102005016279B4 (en) | 2005-04-08 | 2018-09-13 | Continental Automotive Gmbh | Circuit arrangement and method for actuating an up and dischargeable, electromechanical actuator |
DE102008061586B4 (en) | 2008-12-11 | 2015-08-20 | Continental Automotive Gmbh | Method and device for controlling a solid state actuator |
DE102014209326A1 (en) * | 2014-05-16 | 2015-11-19 | Robert Bosch Gmbh | Method for determining a closing time of a fuel injector |
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US5097171A (en) * | 1989-10-24 | 1992-03-17 | Nippondenso Co., Ltd. | Piezo-actuator shock absorber damping force controlling system having abnormality detection function |
JPH04286657A (en) * | 1991-03-18 | 1992-10-12 | Fujitsu Ltd | Circuit for detecting abnormality of piezoelectric element |
DE19835494C2 (en) * | 1998-08-06 | 2000-06-21 | Bosch Gmbh Robert | Pump-nozzle unit |
DE19930309C2 (en) * | 1999-07-01 | 2001-12-06 | Siemens Ag | Method and device for regulating the injection quantity in a fuel injection valve with a piezo element actuator |
DE10038995A1 (en) * | 1999-10-16 | 2001-04-19 | Bosch Gmbh Robert | Fuel metering control method for i.c. engine has setting element for fuel feed valve controlled to provide intermediate valve position under given operating conditions |
US6420817B1 (en) * | 2000-02-11 | 2002-07-16 | Delphi Technologies, Inc. | Method for detecting injection events in a piezoelectric actuated fuel injector |
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- 2003-02-03 EP EP03708014A patent/EP1472454B1/en not_active Expired - Lifetime
- 2003-02-03 WO PCT/DE2003/000297 patent/WO2003067073A1/en not_active Application Discontinuation
- 2003-02-03 DE DE50311804T patent/DE50311804D1/en not_active Expired - Lifetime
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Publication number | Publication date |
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DE50311804D1 (en) | 2009-09-24 |
EP1472454A1 (en) | 2004-11-03 |
WO2003067073A1 (en) | 2003-08-14 |
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