EP1815110A1 - Method for calibration of a positional sensor on a rotational actuator device for control of a gas exchange valve in an internal combustion engine - Google Patents
Method for calibration of a positional sensor on a rotational actuator device for control of a gas exchange valve in an internal combustion engineInfo
- Publication number
- EP1815110A1 EP1815110A1 EP05799743A EP05799743A EP1815110A1 EP 1815110 A1 EP1815110 A1 EP 1815110A1 EP 05799743 A EP05799743 A EP 05799743A EP 05799743 A EP05799743 A EP 05799743A EP 1815110 A1 EP1815110 A1 EP 1815110A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- path
- gas exchange
- electric motor
- exchange valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
- F01L9/22—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by rotary motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/044—Reciprocating cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
- F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
- F01L2009/2167—Sensing means
- F01L2009/2169—Position sensors
Definitions
- the present invention relates to a method for calibrating a displacement sensor of a Drehaktuatorvortechnik for controlling a gas exchange valve of an internal combustion engine according to the preamble of claim 1.
- the method finds application in Drehaktuatorvortechniken without mechanical stops.
- the camshaft for controlling the gas exchange valves is mechanically driven by a timing chain or a timing belt from the crankshaft.
- a so-called fully variable (variable timing and variable valve lift) for example, a so-called electromagnetic valve train.
- an "actuator unit” is assigned to each valve or "valve group" of a cylinder.
- a valve or a valve group is associated with an opening and a closing magnet. By energizing the magnets, the valves can be moved axially, ie opened or closed.
- the other basic type (so-called rotary actuator) is a control shaft provided with a cam, wherein the control shaft is pivotable by an electric motor back and forth.
- valve spring and additional spring are such that during periodic operation of the rotary actuator device according to the position of the gas exchange valve, the kinetic energy is stored either in the valve spring (closing spring) or in the additional spring (opening spring).
- the device described proposes for the unique positioning of the control cam in its end positions, which is clearly positioned by means of a first and by means of a second rotation stop.
- a disadvantage of this arrangement is that the calibration of displacement sensors for position determination by approaching mechanical stops does not have a satisfactory accuracy for all applications.
- the mechanical tolerances of the system are so large that a required accuracy can not be achieved.
- the object of the invention is to provide a method for measuring and calibrating a displacement sensor for a rotary actuator device, by means of which a more accurate positioning or position determination of the actuating element (and thus also of the gas exchange valve) is ensured.
- a method is to be specified, which ensures a measurement or calibration in both operating phases with low engine speed and operating phases with high engine speed in a reliable manner.
- the object is achieved by the entirety of the features of the independent claim.
- at least one state variable of the electric motor is determined and compared with a stored reference variable.
- the stored nominal path is controlled by means of which the electric motor or the rotor of the electric motor is controlled and / or the value detected by the displacement sensor as a function of the height the deviation of the state quantity from the reference value, changed.
- the determination of the state variable is preferably carried out by measuring the corresponding value.
- the state variable can also be calculated on the basis of a stored model.
- the state variable is the rotor angle, a time derivative of the rotor angle, and / or the motor current of the electric motor or one to the motor current proportional size (motor power, supply voltage of the electric motor) determined.
- the change in the stored nominal trajectory and / or the detected travel sensor value preferably takes place by multiplying the stored desired trajectory values or travel sensor values by a correction factor and / or by adding a stored offset value.
- Correction factor and / or offset value are referred to below as the correction value.
- the correction value is determined as a function of the determined path deviation. The determination can be made by selecting from a stored stored table or by online calculation. At a high deviation (above a predetermined first deviation threshold), due to which the rotor threatens to fall, for example, in an unwanted intermediate position, a correspondingly high correction value is assigned, so that even in the same cycle or in the immediately subsequent cycle of the rotor this highly corrected values is regulated. A drop of the rotor in the described intermediate position is effectively prevented.
- the at least one monitored state value determined with each or every nth cycle can be averaged over a plurality of working cycles.
- An assignment or determination of a corresponding correction factor then takes place in particular on the basis of the averaged correction factor.
- a working cycle in the context of the invention, in particular the opening or closing operation of a gas exchange valve or the immediately attributable thereto associated pivoting operation of the rotor of the electric motor is called.
- a definition of the work cycle which includes closing and opening operation. Since no gas counterpressures are to be taken into account during the closing process, the method according to the invention preferably takes place during the calibration of the displacement sensor during the closing process of the gas exchange valve assigned to the displacement sensor.
- the method according to the invention comprises two different strategies for measuring or calibrating the rotary actuator.
- a first strategy is to detect smaller deviations of the rotor from the predetermined desired path by means of which it is controlled, and to make a change of the nominal path by means of which the rotor is then regulated in the future, via a plurality of working cycles and depending on the averaged deviation / or to change the path sensor signals in such a way that a correspondingly corrected path profile will be adjusted in future due to the changed path sensor signals.
- This strategy extends over several working cycles (slow intervention).
- the second strategy is to counteract larger deviations with a quick rule intervention.
- Figure 1 the schematic representation of a Drehaktuatorvorraum for driving a gas exchange valve of a not shown
- Figure 3a-c illustrates in three different diagrams the
- FIG. 6 shows the linear relationship between displacement sensor and rotor angle in the fault-free and faulty case.
- FIG. 1 shows the schematic representation of a rotary actuator for driving a gas exchange valve 2 of an internal combustion engine, not shown.
- the essential components of this device are, in particular designed as a servomotor electric motor 4 (drive means), one driven by this, preferably two cams 6a, 6b different hubs and rotationally fixed with the Rotor shaft connected camshaft 6 (actuator), one with the camshaft 6 on the one hand and with the gas exchange valve 2 on the other hand operatively connected rocker arm 8 (transmission element) for transmitting movement of the given by the cam 6a, 6b lifting height on the gas exchange valve 2 and a, the gas exchange valve 2 in Closing direction with a spring force acting on and designed as a closing spring first energy storage means 10 and, via the camshaft 6 and the drag lever 8, the gas exchange valve 2 with an opening force beauf fileddes and designed as an opening spring second energy storage means 12.
- drive means drive means
- control device controls the rotor profile of the, at least one actuator 6, 6a, 6b driving electric motor 4.
- the ideal path of the rotor, which resonates as part of the vibration system is calculated analogously to the ideal waveform of the overall system and forms the desired path to Regulation of the electric motor 4.
- a non-illustrated displacement sensor is present, which transmits a sensor signal S to the control device 20 or another control device.
- the electric motor 4 is so by the Controlled control device 20 that the at least one gas exchange valve 2 from a first Ventilendlage E1, which corresponds for example to the closed valve position, in a second valve end position E2, E2 ! , which, for example, corresponds to a partial (E2 1 : partial lift) or maximum open (E2: full lift) valve position, and vice versa.
- the system is ideally designed so that the actuator 6, 6a, 6b in the exclusion (targeted disregard) of environmental influences (in particular friction and gas back pressure) the way between two end positions R1 - R2 (full stroke) or RV - R2 '(partial stroke) without feed additional energy, ie without active drive by the drive device 4, travels and thus engages supportive only in the environmental influences occurring in practice.
- the system is preferably designed such that it is in the maximum end positions R1, R2 of the rotor (vibration end positions at maximum vibration) each in a metastable torque neutral position in which the forces are in an equilibrium of forces and in which the rotor without applying a additional holding force is held.
- the gas exchange valve 2 in the first metastable and torque-neutral position R1 (shown in Figure 1) the gas exchange valve 2 is closed and thus the closing spring 10 while maintaining a residual preload maximum relaxed, while the opening spring 12 is biased to the maximum.
- the force of the prestressed opening spring 12 is via a stationary Supporting member 6c of the camshaft 6 transmitted to this and is directed in the position R1 exactly through the center of the camshaft 6 and thus virtually neutralized.
- the existing due to the residual bias force of the closing spring 10 is neutralized in the described position, as this is also directed via the cam followers 8 in the center of the camshaft 6.
- the gas exchange valve 2 In the second metastable and momsfennrälrellen position R2, not shown, the gas exchange valve 2 would be opened with its maximum stroke according to the main cam 6b and the gas exchange valve 2 arranged around closing spring 10 maximum biased while the opening spring 12 would be maximally relaxed while maintaining a residual bias.
- the arrangement of the individual components is chosen such that again the force of the maximum prestressed spring means (now: closing spring 10) and the maximum relaxed spring means (now: opening spring 12) respectively directed through the center of the camshaft 6 and thus virtually neutralized in this position are.
- a third, also not shown, stable and torque-neutral position RO is present when the system assumes a so-called dropped state in which the camshaft 6 assumes a position between the two first metastable and torque-neutral positions R1, R2. From the fallen position, the system can be brought out again only by means of a high energy expenditure, in which, for example, by swinging or swinging the rotor, the camshaft 6 is again transferred to one of the first two metastable torque-neutral positions R1, R2 or the camshaft 6 at least up to a partial lift is swung, in which a regular operation of the rotary actuator device is possible again.
- the rotor thus oscillates from one end position E1, E1 'into the other end position E2, E2' solely on the basis of the energy stored in the energy storage means 10, 12 without the introduction of additional energy, for example by the electric motor 4.
- FIGS. 2 and 3 the state variables rotor angle, rotor angular velocity and output torque or current consumption of the electric motor are shown in three different diagrams ac in the case of smaller displacement sensor errors, while FIGS. 4 and 5 show the state variables for the sensor analogous to FIGS Case of larger sensor error show.
- FIGS. 2-5 the setpoint values or the values to be expected on the basis of the setpoint path are in each case shown as uninterrupted lines and the actual values resulting from a deviation are shown as dashed lines.
- FIGS. 2a-c describe the case in which the rotor of the electric motor 4 moves beyond the setpoint end position due to a faulty path sensor signal S (smaller extent error - within a predetermined first deviation range or below a first deviation threshold, respectively).
- the calibration of the displacement sensor is carried out by evaluating the state variables of the electric motor 4, preferably during the closing phase Ps ch ii e ii of a gas exchange valve. 2
- the specified by the desired path rotor target value in its end position by R2; R2 '(or the associated rotor angle RW (R2); RW (R2')) predetermined, the end position should be reached exactly in the boundary point between opening phase Po Wenn and closing phase Pschiieis.
- FIGS. 3a-c Analogous to FIGS. 2a-c, the case is described in FIGS. 3a-c in that the rotor of the electric motor 4 does not reach the desired setpoint end position due to a faulty displacement sensor signal S (minor error - within a predetermined first deviation range). Due to a present faulty displacement sensor signal S, the control device 20 is suggested that already before reaching the desired rotor end position at R2; R2 '(target rotor end position) has already been reached (comparison of the actual control path IB due to the control for the rotor angle profile with the predetermined desired path SB on the basis of which the rotor angle was adjusted due to the (faulty) displacement sensor signals).
- a correction value for compensating the present error is also determined here.
- the setpoint path to be corrected and / or the path sensor (value) to be corrected are subjected to a correction factor (multiplication) and / or an offset (addition).
- the change of the setpoint path SB and / or the Wegsensorsignals S made such that during a later cycle increased maximum stroke of the gas exchange valve 2 (compared to the maximum stroke reached in faulty Wegsensorsignalen according to actual IB), and in the event that the target value is exceeded, the change in the setpoint path SB and / or the path sensor signal S is made such that a reduced maximum lift of the gas exchange valve 2 is achieved during a later work cycle.
- This essentially results in a targeted displacement of the control technology defined end stops (and thus an adjustment of the maximum stroke) for the rotor of the electric motor.
- a rapid intervention immediately counteracts (FIG. 4a-c, FIG. 5a-c) by using a correction value associated with the present deviation (FIG. Correction factor and / or offset) as far as possible during the same or current work arcade, but at the latest in the next working cycle of the rotor this is controlled by means of a modified reference path SB or a modified path signal S of a newly calibrated displacement sensor.
- the change of the setpoint path SB and / or the Wegsensorsignals S is such that during the same cycle a delayed closing operation of the gas exchange valve 2 is achieved and in the following working cycle (without averaging the measured variables over several Working cycles) the maximum stroke is reduced and a previous closing time is set again.
- a delayed closing operation of the gas exchange valve 2 is achieved and in the following working cycle (without averaging the measured variables over several Working cycles) the maximum stroke is reduced and a previous closing time is set again.
- FIG. 6 shows the linear relationship between the signal S of the displacement sensor (which depicts the position of the rotor) and the actually set rotor angle RW of the electric motor 4.
- a characteristic according to K1 originating at zero point arises.
- a characteristic curve / straight line according to K2 or K3 is established, which is in each case rotated by one point on the error-free straight line.
- the displacement sensor can again supply error-free signals to the control device 20.
- the setpoint path SB can also be adapted for the control of the rotor, or both correction options for parts can be carried out.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fluid-Driven Valves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004054759A DE102004054759B4 (en) | 2004-11-12 | 2004-11-12 | Method for calibrating a displacement sensor of a rotary actuator device for controlling a gas exchange valve of an internal combustion engine |
PCT/EP2005/011222 WO2006050790A1 (en) | 2004-11-12 | 2005-10-19 | Method for calibration of a positional sensor on a rotational actuator device for control of a gas exchange valve in an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1815110A1 true EP1815110A1 (en) | 2007-08-08 |
EP1815110B1 EP1815110B1 (en) | 2008-02-06 |
Family
ID=35517670
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05799743A Not-in-force EP1815110B1 (en) | 2004-11-12 | 2005-10-19 | Method for calibration of a positional sensor on a rotational actuator device for control of a gas exchange valve in an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US7380433B2 (en) |
EP (1) | EP1815110B1 (en) |
AT (1) | ATE385539T1 (en) |
DE (2) | DE102004054759B4 (en) |
WO (1) | WO2006050790A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004054776B3 (en) * | 2004-11-12 | 2006-03-16 | Bayerische Motoren Werke Ag | Method for calibrating a displacement sensor of a rotary actuator device for controlling a gas exchange valve of an internal combustion engine |
DE102009036061B3 (en) * | 2009-08-04 | 2011-02-10 | Mtu Friedrichshafen Gmbh | Method for controlling and regulating an internal combustion engine |
US8222760B2 (en) * | 2010-06-29 | 2012-07-17 | General Electric Company | Method for controlling a proximity sensor of a wind turbine |
JP5609509B2 (en) * | 2010-10-04 | 2014-10-22 | 富士通株式会社 | Instruction system, instruction method, and storage control device. |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19739840C2 (en) * | 1997-09-11 | 2002-11-28 | Daimler Chrysler Ag | Method for controlling an electromagnetically actuated actuating device, in particular a valve for internal combustion engines |
DE10140461A1 (en) * | 2001-08-17 | 2003-02-27 | Bayerische Motoren Werke Ag | Rotary actuator device for stroke control of a gas exchange valve in the cylinder head of an internal combustion engine |
JP4092917B2 (en) * | 2002-01-21 | 2008-05-28 | トヨタ自動車株式会社 | Electromagnetically driven valve control device for internal combustion engine |
US6659053B1 (en) * | 2002-06-07 | 2003-12-09 | Eaton Corporation | Fully variable valve train |
US6722326B1 (en) * | 2002-10-14 | 2004-04-20 | Ford Global Technologies, Llc | Variable lift cylinder valve system for internal combustion engine |
DE10252991A1 (en) * | 2002-11-14 | 2004-05-27 | Bayerische Motoren Werke Ag | Tilting actuator system for inlet or exhaust valve in internal combustion engine has oscillating motor turning shaft with high-lift and low-lift cams engaging adjustable rocker pressing on valve stem |
DE10318246A1 (en) * | 2003-03-31 | 2004-11-11 | Bayerische Motoren Werke Ag | Controlling electromagnetic actuator armature in IC engine of vehicle, carrying out regulation taking into account change in direction of magnetic flux in armature achieved by reversing polarity of coils |
DE602004025560D1 (en) * | 2003-04-26 | 2010-04-01 | Camcon Ltd | ELECTROMAGNETIC VALVE CONTROL DEVICE |
-
2004
- 2004-11-12 DE DE102004054759A patent/DE102004054759B4/en not_active Expired - Fee Related
-
2005
- 2005-10-19 EP EP05799743A patent/EP1815110B1/en not_active Not-in-force
- 2005-10-19 DE DE502005002781T patent/DE502005002781D1/en active Active
- 2005-10-19 AT AT05799743T patent/ATE385539T1/en not_active IP Right Cessation
- 2005-10-19 WO PCT/EP2005/011222 patent/WO2006050790A1/en active IP Right Grant
-
2007
- 2007-05-11 US US11/798,305 patent/US7380433B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2006050790A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102004054759B4 (en) | 2006-08-10 |
US20070208487A1 (en) | 2007-09-06 |
WO2006050790A1 (en) | 2006-05-18 |
ATE385539T1 (en) | 2008-02-15 |
DE102004054759A1 (en) | 2006-05-24 |
DE502005002781D1 (en) | 2008-03-20 |
US7380433B2 (en) | 2008-06-03 |
EP1815110B1 (en) | 2008-02-06 |
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