EP1472454A1 - 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 unitInfo
- Publication number
- EP1472454A1 EP1472454A1 EP03708014A EP03708014A EP1472454A1 EP 1472454 A1 EP1472454 A1 EP 1472454A1 EP 03708014 A EP03708014 A EP 03708014A EP 03708014 A EP03708014 A EP 03708014A EP 1472454 A1 EP1472454 A1 EP 1472454A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piezo
- voltage
- detection
- pump
- current
- 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
Links
- 238000000034 method Methods 0.000 title claims description 26
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 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
- 230000009849 deactivation Effects 0.000 claims description 3
- 239000000446 fuel Substances 0.000 description 52
- 238000002347 injection Methods 0.000 description 16
- 239000007924 injection Substances 0.000 description 16
- 238000002485 combustion reaction Methods 0.000 description 12
- 230000001419 dependent effect Effects 0.000 description 5
- 238000000418 atomic force spectrum Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 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
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- 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
- 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
- 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 the detection of at least one operating state of a pump-nozzle unit having a piezo control valve, in particular for the detection of the hydraulic control and / or the mechanical coupling of the pump-nozzle unit. Furthermore, the invention relates to a device for controlling a piezo control valve of a pump-nozzle unit and for detecting at least one operating state of the pump-nozzle unit, in particular for detecting the hydraulic deactivation and / or the mechanical coupling of the pump-nozzle unit ,
- the mechanical coupling can include, for example, opening a valve pressure plate or a needle.
- Pump-nozzle units are used to supply fuel into a combustion chamber of an internal combustion engine.
- This can be, for example, a pump-nozzle unit with a control and / or controllable fuel pump, a fuel injection nozzle, which has a nozzle needle that can be moved back and forth between a closed position and an open position, a first pressure chamber that extends from the Fuel pump can be filled with fuel under a first pressure, a second pressure chamber, wherein in the second pressure chamber fuel under a second pressure exerts a closing force on the nozzle needle, and a third pressure chamber that communicates with the first pressure chamber, in the third pressure chamber fuel under a third pressure 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 one opening force influenced at least by the currently prevailing pressures is exerted on the nozzle needle.
- Such pressure-controlled injection systems are used for fuel metering, fuel conditioning, shaping the injection process and sealing the fuel supply against the
- Combustion chamber of the internal combustion engine With pressure-controlled injection systems, the time course of the volume flow can be controlled in an advantageous manner during the injection. This can have a positive impact on the performance, fuel consumption and pollutant emissions of the engine.
- the fuel pump and the fuel injection nozzle are generally designed as an integrated component. At least one pump-nozzle unit is provided for each combustion chamber of the internal combustion engine and is usually installed in the cylinder head.
- the fuel pump typically includes a fuel pump piston that can be moved back and forth in a fuel pump cylinder and is driven by a camshaft of the internal combustion engine either directly via a tappet or indirectly via rocker arms.
- the section of the fuel pump cylinder which usually forms the first pressure chamber can be connected to a low-pressure fuel region via a control valve, fuel being drawn from the low-pressure fuel region into the first pressure chamber when the control valve is open and pushed back into the low-pressure fuel region from the first pressure chamber when the control valve is still open becomes.
- the fuel pump piston compresses the fuel located in the first pressure chamber and thus builds up pressure.
- the control valve in the form of a solenoid valve.
- solenoid valves usually have a relatively long response time, which is due in particular to the fact that the magnet armature of a solenoid valve cannot be accelerated as quickly as desired due to the inertia forces which are dependent on its mass. Farther it also takes time to build up the magnetic field to generate the attractive force.
- a pump-nozzle unit equipped with a solenoid valve is known for example from EP 0 277 939 B1.
- pump-nozzle units In order to avoid the problems caused by the use of solenoid valves, it is also known to equip pump-nozzle units with a control valve that is operated piezoelectrically. Such a pump-nozzle unit is known for example from DE 198 35 494 AI.
- the invention is based on the object of developing the generic methods and devices such that the detection of at least one operating state of the pump-nozzle unit, in particular the detection of the hydraulic control of the pump-nozzle unit, with a relatively low hardware and / or software effort is made possible.
- the method according to the invention builds on the generic state of the art in that the detection of the at least one operating state is carried out by comparing either only the piezo current or only the piezo voltage with at least one predetermined threshold value.
- the force curve for a piezo element is given by the following relationship
- a complex signal conversion is not necessary. There are no additional tolerances in the conversion of u (t) and i (t). Thus, for example, the point in time of a force jump can be determined using a simple threshold value circuit. If the hydraulic cut-off is detected, the piezo control valve can be opened, for example, in a throttled manner to avoid the problems explained at the beginning. The high-pressure cutoff then runs more slowly and therefore with less noise. In throttled operation, the piezo control valves generally have a high sensitivity to. A highly precise positioning of the control valve is therefore advantageous for throttled opening. Such a highly precise positioning of the control valve can be achieved, for example, by a piezo-controlled control valve actuator with appropriate control. Also for such a control, it is necessary to detect the force curve or the time of the start of the hydraulic control, which can also be done in the manner according to the invention.
- the detection of the at least one operating state is carried out by comparing the piezo current with at least one predetermined threshold value while an at least substantially constant piezo voltage is being forced.
- the at least substantially constant piezo voltage is approximately zero volts.
- the output of the device driving the piezo element can be short-circuited or terminated with low resistance.
- c3 is a constant independent of the piezo voltage u (t).
- a cut-off pulse can be easily detected by the piezo current i (t) after complete discharge.
- the detection of at least one operating state is enforced by a comparison of the piezo voltage with at least one predetermined threshold value is performed during an at least essentially constant piezo current of the ⁇ .
- the at least substantially constant piezo current is approximately zero amperes.
- the output of the device controlling the piezo element can be decoupled from the piezo element or terminated with high resistance. An exchange of the induced charge carriers is not possible when force is applied. Under these conditions, Formula 1 mentioned at the beginning can again be considerably simplified and the following relationship results between the actuator force F (t) and the piezo voltage u (t):
- a control pulse can be easily detected via the piezo voltage u (t) after complete discharge.
- the detection of the after the piezo voltage was kept at an at least substantially constant value at least one operating condition by a comparison of the piezo chip ⁇ voltage with at least one predetermined threshold leads carried is.
- the at least substantially constant value of the piezo voltage is smaller than a piezo voltage previously used to control the piezo control valve and greater than zero volts.
- the piezo element is discharged to a certain level after a stepped discharge and held at this level for a predetermined holding phase. During this holding phase, the control is decoupled or terminated with high resistance, so that no charge exchange takes place.
- the simplified relationship of Formula 3 is again valid.
- the further determination of the force jump (Formula 4) is, however, only possible with difficulty since the partial discharge level is not exactly known. In this case, the voltage-dependent constant cl must be taken into account as a 1st order polynomial in the differentiation, which can be done, for example, via a stored map.
- the device according to the invention builds on the generic prior art in that it performs the detection of the at least one operating state by comparing either only the piezo current or only the piezo voltage with at least one predetermined threshold value.
- a first embodiment also provides for the detection of the at least one operating state by comparing the piezo current with at least one predetermined threshold value while forcing an at least substantially constant piezo voltage.
- the at least substantially constant piezo voltage is approximately zero volts.
- the device carries out the detection of the at least one operating state by comparing the piezo voltage with at least one predetermined threshold value, while forcing an at least substantially constant piezo current.
- the at least substantially constant piezo current is approximately zero amperes.
- a third embodiment of the device according to the invention it is provided that it carries out the detection of the at least one 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 piezo voltage is less than a piezo voltage previously used to control the piezo control valve and greater than zero volts.
- the invention is based on the knowledge that only one electrical variable is required for detection.
- the circuit design is preferably adapted such that the piezo actuator is short-circuited or terminated with high resistance during the detection phase. For example, a jump in strength can then be represented directly by the current profile or by the differentiated voltage.
- FIG. 1 shows a schematic embodiment of a pump-nozzle unit with or with which the method according to the invention or the device according to the invention can be used;
- Figure 2 is a schematic partial sectional view of a piezo control valve which can be used with the pump-nozzle unit of Figure 1;
- FIG. 3 shows a curve which illustrates the first embodiment of the method according to the invention, this curve profile being able to be brought about by the first embodiment of the device according to the invention;
- FIG. 4 shows a curve which illustrates the second embodiment of the method according to the invention, this curve profile being able to be caused by the second embodiment of the device according to the invention
- FIG. 5 shows a curve which illustrates the third embodiment of the method according to the invention, it being possible for this curve profile to be brought about by the third embodiment of the device according to the invention.
- FIG. 1 shows schematically a pump-nozzle unit.
- the pump-nozzle unit shown 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 can be moved back and forth in a fuel pump cylinder 16.
- the fuel pump piston 14 is driven directly or indirectly via a camshaft, not shown, of the internal combustion engine.
- the compression chamber 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 controlled according to the invention.
- the piezo control valve 22 serves to either close the fuel line 20 or to connect it to a low-pressure fuel region 18 from which fuel 10 can be drawn.
- the pump-nozzle unit shown further comprises a fuel inlet, designated overall by 24.
- Spray nozzle which has a nozzle needle 46 which can be moved back and forth between a closed position and an open position.
- a pressure pin 26 can in particular exert a downward force on the nozzle needle 46.
- an adjusting disk 40 is provided, which is guided in a second pressure chamber 30 , fuel 10 in the second pressure chamber 30 having a second pressure p 30 being pressed downward via the pressure pin 26, based on the illustration in FIG directed closing force exerts on the nozzle needle 46.
- the shim 40 is preferably only so strongly sealed to the second pressure chamber 30, that the second pressure p 3 is already dismantled o before beginning a new injection cycle.
- a further closing force is exerted by a first spring 36 on the pressure pin 26 and thus the nozzle needle 46, the first spring 36 being arranged in the second pressure chamber 30 and having its rear end supported on the adjusting disk 40.
- a section of the nozzle needle 46 having a shoulder 44 is surrounded by a third pressure chamber 32, which communicates with the first pressure chamber 28 via a connecting line 42.
- a third pressure P32 is built up in the third pressure chamber 32 as a function of the throttling effect of the connecting line 42 and possibly other throttling devices (not shown), depending on the first pressure p 28 prevailing in the first pressure chamber 28.
- 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 thus be influenced via the second pressure p 30 in the second pressure chamber 30.
- a pressure limiting and holding valve 34 can be provided between the first pressure chamber 28 and the second pressure chamber 30.
- the pump-nozzle unit shown can be monitored by the method according to the invention for operating states of interest, for example for a cut-off pulse that results when the fuel injection into the combustion chamber 12 ends.
- An embodiment of the device 80 according to the invention, which controls the piezo element of the piezo control valve 22, can advantageously be used to carry out the method according to the invention.
- FIG. 2 shows a schematic partial sectional view of a piezo control valve 22 which can be used with the pump-nozzle unit according to FIG. 1.
- the piezo control valve 22 shown has a movable element 48 in the form of a valve needle which can be moved into the first end position shown for closing the piezo control valve 22 and into a second end position for fully opening the piezo control valve 22, which is related to FIG the display is shifted to the right.
- a valve plate 64 provided on the valve needle 48 interacts with a valve seat 62 on the housing side.
- the low-pressure fuel region 18 is closed off from a high-pressure chamber 38, which is connected to the fuel line 20 shown in FIG. 1.
- the piezo control valve 22 has a piezo element 76. If the piezo element 76 is actuated appropriately, it exerts a force on a pressure piece 54 via an end face 78. The pressure piece 54 in turn transmits the force generated by the piezo element 76 to a first lever 56 and a second lever 58, the first lever 56 and the second lever 58 being provided to effect a force transmission. The first lever 56 and the second lever 58 abut a second axial end surface 72 of the valve needle 48 by which the the translated force generated by the piezo element 76 to be transmitted to the valve needle 48.
- the translated force generated by the suitably controlled piezo element 76, which acts on the valve needle 48, is greater than an opposite force, which is generated by a second spring 66 and is exerted on a first axial end face 70 of the valve needle 48 via a spring pressure piece 68.
- the low-pressure fuel region 18 is connected to an exhaust chamber 50, which is also connected via a compensating bore 52 to an actuator chamber 74 located in front of the piezo element 76. This actuator chamber 74 is connected to a return 60 via which fuel can flow back from 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 in such a way that the first, second or third embodiment of the method according to the invention is carried out, as a result of which FIGS. 3, 4 or 5 explained in the following shown curves can result.
- the piezo voltage u (t) is initially increased linearly in an interval between the times ti and t 2 .
- the piezo current i (t) initially rises within this interval and then drops again to zero.
- the pressure p 38 in the high pressure chamber 38 increases.
- the piezo voltage is kept approximately constant, the piezo current i (t) having the value zero during this interval.
- the pressure p 38 in the high pressure chamber 38 continues to rise.
- the piezo voltage u (t) is reduced again to zero.
- the piezo current i (t) first takes a negative value and then rises again to zero.
- the pressure p 38 in the high-pressure chamber 38 initially rises further and then begins to drop.
- a piezo voltage u (t) of zero volts is forced.
- the discharge control caused by the hydraulic control The pulse of the piezo current i (t) can now be detected by comparing the piezo current i (t) with a detection threshold.
- a detection signal for the control pulse is generated at time t 5 .
- FIG. 3 thus illustrates a control pulse detection by the piezo current i (t) after complete discharge.
- the piezo voltage u (t) is initially increased linearly in an interval between the times ti and t 2 .
- the piezo current i (t) initially rises within this interval and then drops again to zero.
- the pressure p 38 in the high pressure chamber 38 increases.
- the piezo voltage is kept approximately constant, the piezo current i (t) having the value zero during this interval.
- the pressure p 38 in the high pressure chamber 38 continues to rise.
- the piezo voltage u (t) is reduced again to zero.
- the piezo current i (t) first takes a negative value and then rises again to zero.
- the pressure p 3 ⁇ in the high-pressure chamber 38 initially rises further and then begins to drop.
- a piezo current i (t) of zero is forced by a high-resistance termination.
- a control pulse of the piezo voltage u (t) generated by the control can now be compared with a detection threshold value for the piezo voltage.
- a detection signal for the control pulse is generated again, as shown in FIG. 4 below.
- the curve of FIG. 4 thus corresponds to a control pulse detection by the piezo voltage u (t) after complete discharge.
- the piezo voltage u (t) is initially increased linearly in an interval between the times ti and t 2 .
- the piezo current i (t) increases within this interval next and then drops back to zero.
- the pressure p 38 in the high pressure chamber 38 increases.
- the piezo voltage is kept approximately constant, the piezo current i (t) having the value zero during this interval.
- the pressure p 38 in the high pressure chamber 38 continues to rise.
- the piezo voltage u (t) drops to a value> zero.
- the piezo current i (t) takes on a negative value and then rises again to zero, while the pressure p 3g in the high-pressure chamber 38 continues to rise. From time t 4 , a piezo current i (t) of zero is forced by a high-resistance termination.
- the piezo voltage u (t) therefore remains at the value it had at the time t 3 until the control pulse of the piezo voltage u (t) occurs.
- This cut-off pulse can be identified by comparing the piezo voltage u (t) with a detection threshold value, the detection threshold value in this case having to have a higher value than the piezo voltage u (t) had at time t 3 .
- the curve of FIG. 5 thus illustrates a control pulse detection by the piezo voltage u (t) after a partial discharge.
- the invention can be summarized as follows: In particular, detection of the hydraulic deactivation of a pump-nozzle unit having a piezo control valve is carried out according to the invention by comparing either only the piezo current or only the piezo voltage with at least one predetermined threshold value. For this purpose, either an essentially constant value of preferably zero volts is enforced for the piezo voltage not used for the comparison, or it is used for the piezo current not used for the comparison an at least substantially constant value of preferably zero is enforced.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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)
Publication Number | Publication Date |
---|---|
EP1472454A1 true EP1472454A1 (en) | 2004-11-03 |
EP1472454B1 EP1472454B1 (en) | 2009-08-12 |
Family
ID=27674584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03708014A Expired - Lifetime EP1472454B1 (en) | 2002-02-07 | 2003-02-03 | Method and device for detecting operating states of a pump-nozzle unit |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1472454B1 (en) |
DE (1) | DE50311804D1 (en) |
WO (1) | WO2003067073A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
2003
- 2003-02-03 WO PCT/DE2003/000297 patent/WO2003067073A1/en not_active Application Discontinuation
- 2003-02-03 EP EP03708014A patent/EP1472454B1/en not_active Expired - Lifetime
- 2003-02-03 DE DE50311804T patent/DE50311804D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03067073A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2003067073A1 (en) | 2003-08-14 |
DE50311804D1 (en) | 2009-09-24 |
EP1472454B1 (en) | 2009-08-12 |
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