EP1836386A1 - Verfahren und vorrichtung zum steuern eines injektors - Google Patents
Verfahren und vorrichtung zum steuern eines injektorsInfo
- Publication number
- EP1836386A1 EP1836386A1 EP05813421A EP05813421A EP1836386A1 EP 1836386 A1 EP1836386 A1 EP 1836386A1 EP 05813421 A EP05813421 A EP 05813421A EP 05813421 A EP05813421 A EP 05813421A EP 1836386 A1 EP1836386 A1 EP 1836386A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- fluid
- ctrl
- closed position
- piezo actuator
- 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 17
- 239000012530 fluid Substances 0.000 claims abstract description 50
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 24
- 239000000446 fuel Substances 0.000 description 23
- 230000004913 activation Effects 0.000 description 9
- 238000001228 spectrum Methods 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000002828 fuel tank Substances 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000002123 temporal effect Effects 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
- F02D2041/223—Diagnosis of fuel pressure sensors
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2464—Characteristics of actuators
- F02D41/2467—Characteristics of actuators for injectors
- F02D41/247—Behaviour for small quantities
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
Definitions
- the invention relates to a method and apparatus for controlling a Inj ector, which is designed in particular for metering fuel into an internal combustion engine.
- a particularly good mixture preparation can be achieved if, prior to a main injection, one or more pre-injections take place, which are also referred to as pilot injection, with possibly a very low fuel mass being metered for the individual pre-injection should .
- pilot injection also referred to as pilot injection
- a precise control of the injection valve is very important, especially for these cases.
- the injector includes an injector body having a control chamber associated with a control valve that controls fuel pressure in the control chamber.
- the piezoelectric actuator acts on the control valve.
- the piezoelectric actuator is subjected to a voltage such that the resulting stroke of the piezoelectric actuator actuates the control valve.
- An axial displacement of a nozzle needle from a valve seat is detected as a function of an increase in the voltage drop across the piezoelectric actuator.
- An end of the movement of the nozzle needle is detected by means of an abrupt drop in the voltage across the piezoelectric actuator.
- the object of the invention is to provide a method and a device which allow precise control of an injector.
- the invention is characterized by a method and a corresponding device for controlling an Inj ector, which can also be referred to as an injection valve.
- the Inj ector has a nozzle needle whose position is adjustable depending on a pressure in a control chamber and in a closed position prevents fluid flow through at least one injection hole in a nozzle body and this otherwise free gives .
- the Inj ector further comprises a control chamber which is hydraulically coupled to a fluid high-pressure accumulator, a piezo actuator and a control valve which hydraulically decouples the control chamber in its closed position of a low pressure chamber, the hydraulic outside of its closed position, the control chamber coupled with the low pressure chamber and acting on the piezo actuator.
- a combination of a drive time period of the piezo actuator and an electrical energy supplied to the piezo actuator is varied from a predetermined start combination to a target combination in which a pressure profile is detected, which is characteristic for a movement of the control valve out of its closed position, without the metering of fluid through the injection hole.
- the target combination is a simple and precise measure of the dead-stroke of the piezo actuator, which is an extremely important parameter, especially in the context of metering the smallest possible quantities of fluid through the injector.
- the target combination can be determined as a measure of the current idle stroke at any predeterminable time intervals over the operating period of Inj ektorventils, which can change significantly over the lifetime of Inj ector and may also be subject to short-term fluctuations.
- Influencing variables for the idle stroke are, for example, the temperature, wear and aging of the piezo actuator.
- the electrical energy to be supplied to the piezo actuator and / or the actuation period of the piezo actuator can then be corrected for the following injection processes.
- the target combination can also advantageously be used in the context of controlling the injector for other purposes, such as a diagnosis.
- the combination of the An horrin and the supplied energy is carried out starting from the predetermined starting position to the target combination in an operating condition in which an actuator for setting a fluid supply in the fluid high-pressure accumulator in its closed state.
- This has the advantage that the detected pressure curve is then more independent of disturbing influences, which are caused by a conveyance of the fluid into the fluid high-pressure accumulator.
- it is easier then a precise detection of the pressure curve possible, which is characteristic of the movement of the control valve out of its closed position, without there being a metering of fluid through the injection hole.
- the combination of the driving time duration and the supplied electrical energy is varied with a charging time period during which electrical energy is supplied to the piezoelectric actuator which is longer than that during operation of the injector in which A metering of fluid is intended. In this way, a generation of sound is reduced, which can be perceived by a user as unpleasant.
- the combination of the driving time period and the supplied electrical energy is varied with a discharging period during which electrical energy is drawn from the piezo actuator which is longer than the one during operation of the injector, in which a metering of Fluid through the injection hole is intended. Also in this way the sound is reduced, which is perceived by a user as unpleasant.
- a beginning of successive drive time periods is varied with respect to the respective cylinder segment.
- the sound spectrum can be selectively adjusted by the control of the control valve, so as to make the subj eective perception of the sound by the user as less disturbing.
- an end of successive An Kunststoffzeitdauern with respect to the j eaji cylinder segment is varied.
- the sound spectrum generated by the control of the control valve can be selectively adjusted so as to make the subj eective perception of the sound by the user as less disturbing.
- the beginning of successive An KunststoffzeitDauern for different Inj ectors for example, all of an internal combustion engine are assigned, with respect to the j ehyroid cylinder segment varies. Also in this way, the sound spectrum generated by driving the j eshing control valves can be adjusted very effectively.
- the end of successive An Kunststoffzeitdauern for different Inj ectors with respect to the j ehyroid cylinder segment is varied. Even this way can be easy the sound spectrum generated by driving the respective control valves is set.
- FIG. 1 shows an internal combustion engine with a plurality of injectors
- FIG. 2 shows one of the injectors according to FIG. 1,
- FIG. 3 shows a first enlargement of a section of the injector according to FIG. 2,
- FIG. 4 shows a second enlargement of a further section of the injector according to FIG. 2,
- FIG. 5 is a flow chart of a program for controlling the injector
- FIGS. 6A to 6D show time profiles of drive signals for the injectors
- Figure 7 shows a time course of one of the drive signals during a charging period.
- An internal combustion engine (FIG. 1) comprises an intake tract 1, an engine block 2, a cylinder head 3, an exhaust tract 4 and a feed device 5 for fuel.
- a plurality of cylinders Z1 to Z4 are formed at which in each case injectors 7, 9, 11, 13 are assigned.
- a crankshaft 15 is provided, which is associated with a crankshaft angle sensor 17, which detects the current crankshaft angle, from which then a speed of the crankshaft can be derived.
- the fuel supply device 5 comprises a fuel tank 19 and a low-pressure region 21 which is either hydraulically coupled directly to the fuel tank 19 or is hydraulically coupled to the fuel tank 19 via a low-pressure pump 23.
- a regulator 25 is further provided, by means of which a pressure in the low-pressure region 21 can be adjusted.
- a high-pressure pump 29 is hydraulically coupled on the input side via a volume flow control valve VCV with the low pressure region 21.
- the high-pressure pump 29 is hydraulically coupled on the output side to a fluid high pressure accumulator 31 and thus promotes fluid, in particular fuel in the fluid high pressure accumulator 31.
- a volume flow can be adjusted, which is promoted by the high pressure pump 29 in the fluid high pressure accumulator 31 .
- the volume flow control valve VCV may be formed separately from the high-pressure pump 29 or as a structural unit with the high-pressure pump 29.
- a fuel pressure sensor 33 is arranged, which detects the pressure in the fluid high pressure accumulator.
- the measurement signal of the high-pressure sensor is thus representative of a pressure profile of the fluid in the high-pressure fluid reservoir 31.
- the injectors 7, 9, 11, 13 are hydraulically coupled to the fluid high-pressure accumulator 31 via a respective high-pressure connection (FIG. 2).
- a control device 35 which generates control signals for controlling actuators of the internal combustion engine as a function of measured variables which are detected by sensors.
- the control device 35 has corresponding inputs via which measurement signals of the sensors are detected can, and a program and a data memory and a computing unit and power amplifiers for driving the actuators of the internal combustion engine.
- the Inj rectors 7-13 are identical and are explained in more detail below with reference to Figures 2 to 4.
- the injector 7-13 includes an injector housing 37 that receives the high pressure port 39 that is hydraulically coupled to the fluid high pressure accumulator 31.
- the high-pressure port 39 is hydraulically coupled via a first high-pressure bore 41 with a control valve 43 which is housed in the Inj ektorgephinuse 37.
- a second high pressure bore 45 extends from the high pressure port 39 through the injector housing 37 into a nozzle body 47.
- a low-pressure chamber 49 is further formed, which is hydraulically coupled to the low-pressure region 21. If the low-pressure pump 23 is present, the low-pressure chamber 49 can also be coupled directly hydraulically with a return to the fuel tank 19.
- a recess 51 of the Inj ector housing 37 is formed, in which a control piston 53 is arranged and guided.
- a control space 55 of the control valve 43 adjoins an end face 69 of the control piston 53 and is formed in the free space between the end face and the control valve 43.
- a free space of the recess 51 of the Inj ektorgepuruses 37 in the region of one end of the control piston 53, which faces away from the control chamber 55 is hydraulically coupled to the low pressure chamber 49.
- a nozzle needle 57 is mechanically coupled to the control piston 53 and is in a recess 59 in the Nozzle body 47 is arranged. In a closed position of the nozzle needle 57, this prevents fluid flow through an injection hole 61 which is formed in the nozzle body 57. Outside the closed position, the nozzle needle 57 releases the fluid flow through the injection hole 61. If a plurality of injection holes 61 are present, the nozzle needle 57 prevents the fluid flow in its closed position by all its associated injection holes 61 and releases it otherwise.
- the position of the nozzle needle 57 depends on a force balance of forces acting on the nozzle needle 57.
- a first force is caused by the pressure in the control chamber 45, which acts on the end face 69 of the control piston.
- a second force is coupled by the pressure acting on the surface of a high pressure shoulder 63 and on the needle tip 65.
- a third force is caused by a spring force of a nozzle spring 67. The position of the nozzle needle depends on the balance of the first to third forces.
- the control chamber 55 is hydraulically coupled via an inlet throttle 71 with the first high-pressure bore 41.
- the control chamber 55 is also hydraulically coupled via an outlet throttle 73 depending on the switching position of the control valve 43 with the low pressure chamber 49.
- the control valve 43 is associated with a piezo actuator 75, the axial extent of which depends on the electrical energy supplied to it.
- the piezo actuator 75 acts on a valve body 77 of the control valve 43 and thus determines the switching position of the control valve 43.
- An idle stroke between the piezo actuator 75 and the valve body 77 is characterized by a clearance between the piezo actuator 75 and the Valve body 77 given in a state in which the piezoelectric actuator 75 is supplied with no electrical energy.
- the idle stroke also includes a continuous force increase caused by an elastic tensioning of the piezo actuator 75 in the injector 7-13 during the supply of electrical energy until the control valve is opened.
- a supply of electrical energy within the idle stroke of the piezo actuator 75 thus does not lead to an elongation of the piezo actuator 75, which acts on the valve body 77 side facing when the piezo actuator 75 rests against the valve body 77.
- the valve body 77 may already be in contact with the piezo actuator 75 even if this is no electrical energy supplied.
- control valve 43 If the control valve 43 is in its closed position, no fluid can flow off via the outlet throttle 73 and the pressure thus rises in the control chamber 55 until it approximately reaches the pressure in the high-pressure fluid reservoir 31. If the control valve 43, ie in particular the valve body 77, is moved out of its closed position, then fluid can flow away from the control chamber 55 via the outlet throttle 73 past the valve body 77 to the low-pressure chamber 49. This has the consequence that the pressure in the control chamber 55 decreases depending on the ratio of the throttle effects of the outlet throttle and the inlet throttle and, if the valve body 77 releases such a small free cross-section, that also in this area, a throttling of the outflow of fluid, also depending on the position of the valve body 77th
- the nozzle needle 57 may be hydraulically coupled to the control chamber 55 and thus the control piston 53 omitted. In this case, then the leakage of fluid in the control chamber 55 is negligible when the control valve 43 is in its closed position.
- a program for controlling the Inj ector 7-13 is stored in the controller 35 in a program memory and is executed during operation of the internal combustion engine, and preferably for each of the Inj ectors 7, 9, 11, 13th
- the program for controlling the injector according to the subsequent steps is suitable for determining a measure for the idle stroke of the control valve.
- the program is started in a step S1 (FIG. 5) in which variables are initialized, if necessary.
- the start of the program can basically be done at any time during operation of the internal combustion engine. Preferably, the start takes place when no fuel in the FIu- id high-pressure accumulator 31 is promoted and, if preferred, no fuel on the Inj ectors 7 to 13 is to be metered into the combustion chambers of the cylinder Zl to Z4.
- a charging period T L and preferably a discharging period T_EL is determined.
- the charging period T_L, and / or the discharging period T EL may correspond to those intended for the operation of the fuel metering injector 7-13. However, they can also deviate from these values, in particular be larger and be either fixed or correspondingly predetermined depending on at least one operating variable of the internal combustion engine, with operating variables comprising the measured variables of the sensors and variables derived therefrom.
- a drive time T_CTRL of the piezo actuator 75 is assigned a start drive time T_CTRL_ST.
- an electrical energy E to be supplied to the piezoelectric actuator 75 is assigned a starting energy E ST.
- the starting energy E_ST and the starting drive time T_CTRL_ST for the piezo actuator 75 are preferably predetermined so that a correspondingly executed drive pulse certainly does not result in fuel being metered through the injection hole 61 into one of the combustion chambers of the cylinders Z1 to Z4 .
- the activation period T_CTRL_ST is preferably representative of a period of time from which electrical energy is initially supplied to the piezo actuator 75 and at the end of which a discharge of the piezo actuator takes place.
- the unloading process is started at the end of the period.
- step S7 it is then checked whether the volume Current control valve VCV is in its closed state CL, in which no or only a small leakage flow of fluid through the flow control valve VCV flows toward the high-pressure pump 29 and thus from the high-pressure pump 29 also no fluid or only the leakage flow of the flow control valve VCV in the high-pressure fluid reservoir 31st is encouraged.
- step S7 If the condition of the step S7 is not satisfied, the program is ended in a step S15.
- step S9 in which the piezo actuator 75 for the drive time T CTRL is driven by supplying the electrical energy E with the determined in step S5 charging time T L and the discharge time T EL.
- the supply of the electrical energy E to the piezoelectric actuator 75 preferably takes place by directly specifying the electrical energy E to be supplied, but it can also be done, for example, by appropriately specifying a current curve or even a voltage curve, in which case preferably temperature-dependent capacitance changes of the piezo actuator should at least be considered.
- the temporal position of the respective activation time period T CTRL relative to the crankshaft angle can be freely selected if a corresponding function for converting an activation of an output stage of the control device 35 permits this at any time and the output stage is likewise designed in this way.
- the control devices 35 are designed to control the piezoelectric actuator 75 in each case only within the cylinder segment ZS1-ZS4 assigned to the respective cylinder Z1 to Z4.
- the cylinder segment ZS1 to ZS4 is understood to mean the crankshaft angle and thus a corresponding time range which results from the Crankshaft angle for a duty cycle of the internal combustion engine divided by the number of cylinders results.
- a cylinder segment In an internal combustion engine with a duty cycle of 720 ° crankshaft and, for example, four cylinders, a cylinder segment is thus 180 ° crankshaft angle. The time period associated with the respective cylinder segment is then dependent on the current rotational speed of the crankshaft 15.
- the cylinder segments associated with the respective cylinders have a predetermined position with respect to a reference angular position of the crankshaft, which may be, for example, an upper dead center of the piston upon ignition ,
- a step Sil it is then checked whether the pressure profile P_V detected by the high-pressure sensor 33 has a characteristic pressure curve P V M for a movement of the control valve 43 out of its closed position without a metering of fluid through the injection hole 61.
- the characteristic pressure curve P_V_M is preferably determined in advance by appropriate tests or simulations and is stored in the data memory of the control device 35. Preferably, it is determined so that the valve body 77 and thus the control valve 43 moves only slightly possible out of its closed position and thus a minimum flow of fuel flows from the control chamber 55 through the outlet throttle 73 past the control valve 43 toward the low pressure chamber 49 when the pressure curve PV corresponds to the characteristic pressure curve PVM.
- step S 1 is preferably also satisfied if the pressure profile PV lies in a predeterminable, preferably narrow, range of values window around the characteristic pressure profile PVM.
- the characteristic pressure curve P_V_M can be represented, for example, by a predefinable change in pressure or a predefinable rate of change of pressure, which is also referred to as a gradient, or also a further correspondingly representative variable.
- step S11 If the condition of step S11 is not met, then an increment time DT is added to the drive time period T CTRL in a step S17.
- an incrementing energy DE is added in step S17 of the electrical energy E to be supplied.
- the incrementing time period DT and the incrementing energy DE are assigned such small values that it can be ensured with a high degree of probability that no further metering of fuel through the injection hole 61 takes place in the event of a corresponding actuation of the injector 7 - 13 in a subsequent run of the step S8 ,
- step S17 it is also possible to vary either only the activation time duration T CTRL or the electrical energy E to be supplied in the step S17. This can also be done differently in successive runs of step S17. Subsequent to step S17, the processing is then continued in step S7.
- step S13 the activation time period T CTRL is assigned to a target activation time period T_CTRL_Z. Further, in step S13, a target energy E Z is assigned the electric power E to be supplied. The process is subsequently ended in step S15.
- the target energy EZ determined in step S13 and the target drive time T_CTRL_Z can each be used independently. be alone or in combination a measure of the idle stroke of the control valve 43.
- reference values for the target energy EZ or the target drive time T_CTRL_Z can then for the following operation of Inj ector 7 to 13 with metering of fuel through the injection hole 61 dedicated drive times or supplied electrical energy be adjusted accordingly and thus a very precise metering of the desired amount of fuel can be achieved.
- the target drive time duration T_CTRL_Z and / or the target power EZ can also be used for a diagnosis of the injector 7 - 13.
- the program for controlling the injector according to FIG. 5 is preferably carried out for each of the injectors 7 - 13, and thus different drive time periods T_CTRL_Z and target energies E_Z can be determined for each of the injectors 7 - 13. In this way, it is thus possible to compensate for any differences between the sectors and thus ensure a uniform metering of fuel via the cylinders Z1 to Z4 of the internal combustion engine.
- the program according to FIG. 5 is preferably in an operating state of the pushing operation of the vehicle during which no fuel is metered into the cylinder of the internal combustion engine, processed or even processed immediately after stopping the engine.
- respective drive pulses assigned to the respective injection valves 7 to 13 of the respective cylinders Z1 to Z4 are plotted, which in each case are generated in the execution of step S9 in the respective injector 7 to 13.
- Drive pulses for the piezo actuator 75 of the Inj ector 7, which is assigned to the cylinder Zl are in each case carried out in the cylinder Zl associated cylinder segment ZSl.
- the height of the drive pulses may be representative of the supplied during the drive pulse energy E.
- the respective drive pulses are varied with respect to the respective cylinder segment with regard to their beginning and / or end, which is based on their different position with respect to the respective cylinder segment ZS1 - ZS4 is recognizable.
- the end and / or the beginning of the respective actuation period T CTRL are also varied relative to one another by different actuation pulses assigned to different actuators 7-13. This is likewise the case with reference to the different position of the drive pulses relative to the respective beginning of the respective cylinder segment ZS1 to ZS4 in the signal curves of FIGS. 6A to 6D.
- a desired sound spectrum can be generated in a targeted manner, which is either not perceived by the user, for example, or is merely perceived as noise or fits into other operating noises of the internal combustion engine.
- the representation of the drive pulses in FIGS. 6A to 6D does not necessarily correspond to the actual waveform of the corresponding physical quantities.
- the electrical power supplied to the piezo actuator 75 is removed again at the end of the activation period.
- a possible course of a drive pulse is shown in more detail with reference to FIG.
- electrical energy is supplied to the piezoelectric actuator 75 for the predefined charging time period T_L. This is preferably done by corresponding energy pulses, which are preferably varied in their height and thus the supplied power PEL, when the supplied energy E is changed.
- the piezo actuator 75 is then discharged again by corresponding discharge pulses of opposite polarity, namely over the discharge time T EL.
- fuel is used in the exemplary embodiments merely as an example for a specific fluid. However, it can also be replaced by fluid.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005001498A DE102005001498B4 (de) | 2005-01-12 | 2005-01-12 | Verfahren und Vorrichtung zum Steuern eines Injektors |
PCT/EP2005/056442 WO2006074842A1 (de) | 2005-01-12 | 2005-12-02 | Verfahren und vorrichtung zum steuern eines injektors |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1836386A1 true EP1836386A1 (de) | 2007-09-26 |
EP1836386B1 EP1836386B1 (de) | 2008-05-28 |
Family
ID=35965966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05813421A Active EP1836386B1 (de) | 2005-01-12 | 2005-12-02 | Verfahren und vorrichtung zum steuern eines injektors |
Country Status (5)
Country | Link |
---|---|
US (1) | US7406952B2 (de) |
EP (1) | EP1836386B1 (de) |
CN (1) | CN101099039B (de) |
DE (2) | DE102005001498B4 (de) |
WO (1) | WO2006074842A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007034188A1 (de) * | 2007-07-23 | 2009-01-29 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Einspritzventils |
DE102008045955A1 (de) * | 2008-09-04 | 2010-03-11 | Continental Automotive Gmbh | Verfahren und Vorrichtung zur Korrektur einer temperaturbedingten Längenänderung einer Aktoreinheit, die im Gehäuse eines Kraftstoffinjektors angeordnet ist |
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EP1705355B1 (de) * | 2005-03-25 | 2008-02-20 | Delphi Technologies, Inc. | Verfahren zur Bestimmung von Parametern eines Einspritzsystems |
-
2005
- 2005-01-12 DE DE102005001498A patent/DE102005001498B4/de not_active Expired - Fee Related
- 2005-12-02 US US11/722,238 patent/US7406952B2/en active Active
- 2005-12-02 EP EP05813421A patent/EP1836386B1/de active Active
- 2005-12-02 DE DE502005004321T patent/DE502005004321D1/de active Active
- 2005-12-02 WO PCT/EP2005/056442 patent/WO2006074842A1/de active IP Right Grant
- 2005-12-02 CN CN200580046473.4A patent/CN101099039B/zh active Active
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DE102005001498A1 (de) | 2006-07-20 |
CN101099039A (zh) | 2008-01-02 |
US20070250248A1 (en) | 2007-10-25 |
DE502005004321D1 (de) | 2008-07-10 |
EP1836386B1 (de) | 2008-05-28 |
DE102005001498B4 (de) | 2007-02-08 |
US7406952B2 (en) | 2008-08-05 |
WO2006074842A1 (de) | 2006-07-20 |
CN101099039B (zh) | 2010-05-12 |
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