EP1423593A1 - Verfahren zum ansteuern eines piezobetriebenen kraftstoff-einspritzventils - Google Patents
Verfahren zum ansteuern eines piezobetriebenen kraftstoff-einspritzventilsInfo
- Publication number
- EP1423593A1 EP1423593A1 EP02760150A EP02760150A EP1423593A1 EP 1423593 A1 EP1423593 A1 EP 1423593A1 EP 02760150 A EP02760150 A EP 02760150A EP 02760150 A EP02760150 A EP 02760150A EP 1423593 A1 EP1423593 A1 EP 1423593A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- time
- injection
- actuator
- piezo
- servo 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
- 238000002347 injection Methods 0.000 title claims abstract description 54
- 239000007924 injection Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims description 27
- 239000000446 fuel Substances 0.000 claims description 22
- 238000010586 diagram Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004088 simulation Methods 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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1413—Controller structures or design
- F02D2041/143—Controller structures or design the control loop including a non-linear model or compensator
-
- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
-
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/08—Injectors peculiar thereto
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
Definitions
- the invention relates to a method for controlling a piezo-operated fuel pressure valve according to the features of claim 1.
- the fuel injection process in diesel engines is usually carried out in several sections, with one or more pre-injections or post-injections in which the amount of fuel injected is small compared to the main injection amount in order to achieve a smoother combustion process for each main injection.
- Fast-switching valves are required for precise metering of the fuel quantities, in particular the small quantities, and for optimizing the injection times, for which purpose piezoelectric injection valves are increasingly being used.
- the piezo actuator actuates a hydraulic servo valve, which then moves the main valve.
- the control of the piezo actuator is carried out by means of control electronics in such a way that the desired amount of fuel is injected.
- the electrical control signals for the injection of small quantities of fuel are designed with regard to the control duration and amplitude so that a safe injection takes place. Because of the si Safety reservations regarding pressure fluctuations in the fuel supply line, parameter tolerances of the system and the wide operating temperature range are associated with this, particularly in the case of pre-injections and post-injections, of an overdose of fuel. For this purpose, the piezo deflection was previously concluded from the charge or energy fed into the piezo actuator.
- Main or post-injections take place or not, and which enables a more precise determination of the amount of each fuel pre-injection, main or post-injection.
- the method according to the invention is based on a detection and evaluation of the changes in length or forces of the piezo actuator, which are effective on the piezo actuator during a control process and are determined from the electrical signals (of the current supplied to the piezo actuator and the voltage building up on it), with the aid of a non-linear actuator model and an adaptive method for evaluating the length changes on the piezo actuator or the forces occurring on it.
- the actuator model contains the non-linear relationships between charge or voltage and mechanical deflection, and operating point-dependent parameters.
- the actuator model also takes into account the dielectric hysteresis of the piezo actuator. This actuator model allows the inference from the electrical to the mechanical variables and the simulation of the piezo actuator in the area of pulse-shaped deflection.
- FIG. 1 shows the change in length s of a piezo actuator during a control process
- FIG. 2 shows the force F acting on a piezo actuator when the valve is opened, with or without fuel injection, and the variables derived therefrom.
- FIG. 1 shows the basic course of the piezo stroke, i.e. the change in length s of a piezo actuator over time t during a control process of a fuel injection valve. This change in length s is calculated using the measured data of the current supplied to the piezo actuator and the voltage then building up thereon with the aid of an actuator model which simulates the properties of a piezo actuator.
- the curve si shows the basic course of the start of the length change s (expansion) of a piezo actuator with a correct injection process.
- the curve rises from the beginning 0 of the Control on, has a kink at a time t A and then rises faster until it reaches a maximum and then drops again.
- the kink is explained by the fact that the piezo actuator covers an empty travel before it asserts itself against the force of the rail pressure in the servo valve and opens the servo valve.
- the dashed curve SQ shows the basic course of the beginning of the change in length (expansion) of a piezo actuator in the event of an incorrect injection process.
- the curve rises gently without showing a kink, reaches a maximum and then drops again, i.e. the free travel is not measured completely.
- the maximum of the curve of the linear expansion of a piezo actuator depends, among other things. on the energy that is fed to the piezo actuator: the greater the amount of energy, the greater the length s.
- the opening of the servo valve therefore begins approximately at the time t A of the curve i i. This opening of the servo valve is imperative for a subsequent injection. The actual injection takes place with a considerable delay, because when the servo valve is opened, the pressure in the valve chamber slowly decreases and only then does the actual injection valve open. The presence of the "kink" in the path is an indication that there is sufficient energy in the piezo so that the servo valve opens.
- the method according to the invention for determining this opening time t A of the servo valve is explained below.
- the time t A varies, for example, with the energy E supplied to the piezo actuator and with the counteracting energy Fuel rail pressure p and the actuator temperature T etc. It is therefore known empirically.
- a first straight line - tangent T] _ - is determined by the length changes at times ti and t 2
- a second straight line - tangent Ti ⁇ - is determined by the length changes at times t 3 and t st.
- Time t A which is evaluated as the time of opening of the servo valve. For a correct injection, however, only such a course of the length change s is evaluated, in which the tangent T] _ ⁇ has a definable steeper angle with respect to the abscissa than the tangent Ti. Otherwise an incorrect injection is assumed (To - T 0 ⁇ ).
- the positions of the time t A may shift in the long term. It is therefore provided that the times t1 to t4 stored in the characteristic diagrams, which determine the time windows W1 and W2, are also stored, ie adapted, as a function of the time t A determined in the previous previous injection process. The injection duration is only determined if a correct injection with a defined injection start was previously determined.
- the fuel injection duration D is determined by means of the force F acting on the piezo actuator. Like the length change s, this force F is determined from the electrical signals (from the current supplied to the piezo actuator and the voltage building up on it) with the aid of the non-linear actuator model already mentioned.
- FIG. 2a shows the basic course of the force Fi acting on a piezo actuator in a fuel injection process or in the case of incorrect injection (F 0 , dashed lines).
- the force F increases from the start of the control process and reaches its maximum at about time t A , then changes to an approximately horizontal course (it decreases slowly in the event of a faulty spray) and makes a jump ms negative and then one when switched off Jump into the positive before it goes back to zero.
- the first time derivative dFi / dt of the force F is used to determine the injection duration D.
- the course of the first derivative dF ⁇ / dt of the force F (FIG. 2a) is shown schematically in FIG. 2b.
- this derivative dFi / dt reaches its maximum where the force F ⁇ _ rises steeply, then becomes negative when the force drops and reaches a
- a tolerance band is set for the value of the first derivative in the area of the above-mentioned plateau, with an upper value gl (for dF / dt positive) and a lower value g2 (for dF / dt negative). Both values are shown in broken lines in FIG. 2b. These values, like the windows W1 and W2 in FIG. 1, can also be shown via characteristic maps as a function of the energy supplied, rail pressure, etc. can be varied.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10143501 | 2001-09-05 | ||
DE10143501A DE10143501C1 (de) | 2001-09-05 | 2001-09-05 | Verfahren zum Ansteuern eines piezobetriebenen Kraftstoff-Einspritzventils |
PCT/DE2002/003226 WO2003023212A1 (de) | 2001-09-05 | 2002-09-02 | Verfahren zum ansteuern eines piezobetriebenen kraftstoff-einspritzventils |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1423593A1 true EP1423593A1 (de) | 2004-06-02 |
EP1423593B1 EP1423593B1 (de) | 2006-11-02 |
Family
ID=7697798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02760150A Expired - Lifetime EP1423593B1 (de) | 2001-09-05 | 2002-09-02 | Verfahren zum ansteuern eines piezobetriebenen kraftstoff-einspritzventils |
Country Status (5)
Country | Link |
---|---|
US (1) | US7040297B2 (de) |
EP (1) | EP1423593B1 (de) |
JP (1) | JP4047809B2 (de) |
DE (2) | DE10143501C1 (de) |
WO (1) | WO2003023212A1 (de) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10301822B4 (de) * | 2003-01-20 | 2011-04-07 | Robert Bosch Gmbh | Verfahren zur Bestimmung der Längenausdehnung eines piezoelektrischen Aktors |
DE10345226B4 (de) * | 2003-09-29 | 2006-04-06 | Volkswagen Mechatronic Gmbh & Co. Kg | Verfahren und Vorrichtung zum Steuern eines Ventils und Verfahren und Vorrichtung zum Steuern einer Pumpe-Düse-Vorrichtung mit einem Ventil |
DE10349307B3 (de) * | 2003-10-23 | 2005-05-25 | Siemens Ag | Diagnoseverfahren für einen elektromechanischen Aktor |
DE10357481A1 (de) * | 2003-12-09 | 2005-07-14 | Siemens Ag | Betriebsverfahren für einen Aktor eines Einspritzventils |
DE102004020937B4 (de) * | 2004-04-28 | 2010-07-15 | Continental Automotive Gmbh | Verfahren zum Bestimmen einer Schließzeit eines Schließgliedes und Schaltungsanordnung |
DE102004023545A1 (de) * | 2004-05-13 | 2005-12-08 | Daimlerchrysler Ag | Verfahren zur Ermittlung der Position eines beweglichen Verschlusselementes eines Einspritzventils |
DE102004029907A1 (de) * | 2004-06-21 | 2006-02-02 | Siemens Ag | Verfahren und Datenverarbeitungsvorrichtung zum Simulieren eines Piezo-Aktuators und Computerprogramm |
DE102004063294B4 (de) * | 2004-12-29 | 2006-11-16 | Siemens Ag | Verfahren und Vorrichtung zum Steuern eines Einspritzventils |
DE102005037361B4 (de) * | 2005-08-08 | 2007-05-24 | Siemens Ag | Verfahren zur Ermittlung eines Ventilöffnungszeitpunkts |
DE102005046743B3 (de) * | 2005-09-29 | 2007-05-16 | Siemens Ag | Verfahren zur Ermittlung des Zeitpunktes des Anschlags eines Ventilkörpers in einem von einem elektromechanischen Aktor betätigten Ablaufventil |
JP4475331B2 (ja) | 2008-01-10 | 2010-06-09 | 株式会社デンソー | 燃料噴射装置 |
DE102008023373B4 (de) * | 2008-05-13 | 2010-04-08 | Continental Automotive Gmbh | Verfahren zum Steuern eines Einspritzventils, Kraftstoff-Einspritzanlage und Verbrennungsmotor |
JP5284005B2 (ja) * | 2008-08-25 | 2013-09-11 | 本田技研工業株式会社 | 圧電アクチュエータの制御方法 |
CN102933836B (zh) * | 2010-05-20 | 2015-06-03 | 康明斯知识产权公司 | 压电燃料喷射器***、估计燃料喷射事件的定时特性的方法 |
DE102010039841B4 (de) * | 2010-08-26 | 2014-01-09 | Continental Automotive Gmbh | Verfahren zum Anpassen der Einspritzcharakteristik eines Einspritzventils |
DE102010041320B4 (de) * | 2010-09-24 | 2021-06-24 | Vitesco Technologies GmbH | Bestimmung des Schließzeitpunkts eines Steuerventils eines indirekt angetriebenen Kraftstoffinjektors |
DE102012204278A1 (de) * | 2012-03-19 | 2013-09-19 | Continental Automotive Gmbh | Verfahren zum Betreiben eines Kraftstoffeinspritzsystems und Kraftstoffeinspritzsystem mit Einspritzventil mit Regelung der Bewegung des Verschlusselementes |
DE102012204272B4 (de) * | 2012-03-19 | 2021-10-28 | Vitesco Technologies GmbH | Verfahren zum Betreiben eines Kraftstoffeinspritzsystems mit Regelung des Einspritzventils zur Erhöhung der Mengengenauigkeit und Kraftstoffeinspritzsystem |
DE102013223750B3 (de) * | 2013-11-21 | 2015-02-19 | Continental Automotive Gmbh | Verfahren zur Bestimmung des Ventilöffnungszeitpunktes bei piezoservobetriebenen Injektoren |
DE102013226849B3 (de) * | 2013-12-20 | 2015-04-30 | Continental Automotive Gmbh | Verfahren zum Betreiben eines Einspritzventils |
DE102014212377B4 (de) * | 2014-06-27 | 2016-07-21 | Continental Automotive Gmbh | Verfahren zur Bestimmung eines Zustandes eines Einspritzventils |
DE102015206286B4 (de) * | 2015-04-09 | 2019-05-29 | Continental Automotive Gmbh | Verfahren und Vorrichtung zum Betreiben eines Injektors |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4748954A (en) * | 1984-07-16 | 1988-06-07 | Nippon Soken, Inc. | Electrostrictive actuator device and fuel injection device using same |
DE4308811B9 (de) * | 1992-07-21 | 2004-08-19 | Robert Bosch Gmbh | Verfahren und Einrichtung zur Steuerung einer magnetventilgesteuerten Kraftstoffzumeßeinrichtung |
GB9225622D0 (en) * | 1992-12-08 | 1993-01-27 | Pi Research Ltd | Electromagnetic valves |
DE19644521A1 (de) * | 1996-10-25 | 1998-04-30 | Siemens Ag | Verfahren und Vorrichtung zum Ansteuern eines kapazitiven Stellgliedes |
DE19652801C1 (de) * | 1996-12-18 | 1998-04-23 | Siemens Ag | Verfahren und Vorrichtung zum Ansteuern wenigstens eines kapazitiven Stellgliedes |
KR100638939B1 (ko) * | 1998-06-25 | 2006-10-25 | 지멘스 악티엔게젤샤프트 | 용량성 액추에이터를 제어하기 위한 방법 및 상기 제어 방법 실행 장치 |
DE19930309C2 (de) * | 1999-07-01 | 2001-12-06 | Siemens Ag | Verfahren und Vorrichtung zur Regelung der Einspritzmenge bei einem Kraftstoffeinspritzventil mit Piezoelement-Aktor |
DE19960971A1 (de) * | 1999-12-17 | 2001-03-08 | Bosch Gmbh Robert | Piezoaktor |
EP1138912A1 (de) * | 2000-04-01 | 2001-10-04 | Robert Bosch GmbH | Online Optimierung eines Einspritzsystems mit piezolektrischen Elementen |
-
2001
- 2001-09-05 DE DE10143501A patent/DE10143501C1/de not_active Expired - Fee Related
-
2002
- 2002-09-02 WO PCT/DE2002/003226 patent/WO2003023212A1/de active IP Right Grant
- 2002-09-02 EP EP02760150A patent/EP1423593B1/de not_active Expired - Lifetime
- 2002-09-02 JP JP2003527256A patent/JP4047809B2/ja not_active Expired - Fee Related
- 2002-09-02 DE DE50208611T patent/DE50208611D1/de not_active Expired - Lifetime
-
2004
- 2004-03-05 US US10/795,015 patent/US7040297B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO03023212A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP4047809B2 (ja) | 2008-02-13 |
WO2003023212A1 (de) | 2003-03-20 |
US7040297B2 (en) | 2006-05-09 |
JP2005501999A (ja) | 2005-01-20 |
EP1423593B1 (de) | 2006-11-02 |
DE10143501C1 (de) | 2003-05-28 |
DE50208611D1 (de) | 2006-12-14 |
US20050072854A1 (en) | 2005-04-07 |
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