EP1287250A1 - Verfahren zur überprüfung eines kapazitiven stellgliedes - Google Patents
Verfahren zur überprüfung eines kapazitiven stellgliedesInfo
- Publication number
- EP1287250A1 EP1287250A1 EP01944976A EP01944976A EP1287250A1 EP 1287250 A1 EP1287250 A1 EP 1287250A1 EP 01944976 A EP01944976 A EP 01944976A EP 01944976 A EP01944976 A EP 01944976A EP 1287250 A1 EP1287250 A1 EP 1287250A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- time
- current
- exceeds
- voltage
- 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 33
- 238000007599 discharging Methods 0.000 claims abstract description 21
- 239000000446 fuel Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000001960 triggered effect Effects 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- 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
- F02D41/20—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
- 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
- F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
-
- 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
- F02D2041/228—Warning displays
Definitions
- the invention relates to a method for checking a capacitive actuator, in particular an actuator for a fuel injection valve of an internal combustion engine, for proper function, according to the preamble of claim 1 or 2.
- the unpublished DE 199 10 388 with an older seniority describes a method for checking a piezoelectric actuator, in particular for a fuel injection valve, in which the opening duration of the actuator determined from the charging and discharging current on the actuator by comparison with threshold values is compared with the duration of the control signal is and thus the proper function of the actuator is diagnosed.
- This method can be used if the charging and discharging times are the same length, since otherwise the opening time of the actuator is not equal to the duration of the control signal.
- an electrical charge must be applied to the actuator, which must be removed from the actuator to close the injection valve.
- the amount of fuel injected is mainly dependent on the duration of the injection.
- the unpublished DE 199 44 734 with an older ranking describes a method for controlling a capacitive actuator with different charging and discharging times.
- control processes can be disturbed by internal or external influences in such a way that the charge applied to the actuator remains on the actuator for longer than specified by the control signals output by an engine control system and the fuel injector remains open for an undefined period, which means that a lot of fuel is injected.
- the actuator voltage üp are measured and compared with threshold values.
- predetermined or determined times (durations) for the control signal, charging, discharging and actuating the actuator are related to one another and compared with a predetermined limit value. From the comparison result, the correct or faulty function of the actuator is concluded.
- FIG. 1 a shows the course of a control signal st over time
- FIG. 1 b shows the course of the charging and discharging current during actuation of an actuator
- FIG. 1d shows the durations of control signal, charging time, discharge time and opening time during an actuating control in a first and third exemplary embodiment
- FIG. Le shows the durations of control signal, charging time, discharging time and opening time during an actuating control in a second and fourth exemplary embodiment.
- Figure la shows the course of a control signal st for a capacitive actuator (not shown) of a fuel injection valve of an internal combustion engine for a fuel injection process.
- These control signals st are determined by an engine control unit (not shown) as the result of several input parameters such as engine speed, load, temperature etc.
- the control signal st begins at a time t1 and ends at a time t4.
- the difference t4 - tl corresponds to the duration Tl of this control signal st. Times and times are indicated in the drawing; Usually, however, such times for the beginning or end of signals are output by the engine control unit in crankshaft angles (° KW).
- the actuator is charged with a charging current + Ip from time t1.
- This charging current + Ip exceeds a predetermined, first current threshold value Sl at time t2, falls below this at time t3 and then becomes zero.
- the actuator is discharged with a discharge current Ip.
- the discharge current -Ip falls below a predetermined, second current threshold value S2 at time t5, exceeds this again at time t ⁇ and then becomes zero.
- Figure lc shows the actuator voltage Up applied to the actuator during a control process. This increases from the beginning of the control signal st at time t1, exceeds a predetermined, lower voltage threshold value S3 at time t2 and a predetermined, upper voltage threshold value S4 at time t3. It then reaches its maximum, which is maintained until the end of the control signal st at time t4. With the end of the control signal st, the actuator voltage Up drops again, falls below the upper voltage threshold value S4 at time t5 and falls below the lower voltage threshold value S3 at time t6, before it becomes zero again.
- Controlled variables are referred to in the following as variables which are measured from the beginning or from the end of the control signal st Charging time T2 and discharging time T3 All other quantities that are measured both when a threshold value is exceeded or undershot are designated as “measured” quantities and are provided with an asterisk. In this exemplary embodiment, this is only the variable T4 * (the opening duration of the valve actuated by the actuator), since it begins when the charging current + Ip falls below the first current threshold value S1. It ends at time t ⁇ , at which the discharge current -Ip exceeds the second current threshold value S2.
- the charging time T2 extends from the start of the control signal st at the time t1 to the time t3 at which the charging current + Ip falls below the first current threshold value S1.
- the discharge duration T3 extends from the end of the control signal st at the time t4 to the time t ⁇ at which the discharge current -Ip exceeds the second current threshold value S2.
- the charging time T2 and the discharging time T3 are also calculated and specified by the engine control, depending on various parameters; these quantities are calculated, saved and are therefore known. Therefore, in this exemplary embodiment, these calculated values for charging time T2 and discharging time T3 are used to determine functional errors of the actuator.
- a method for monitoring a capacitive actuator is also described by means of variables which are derived from the charging or discharging current Ip but are “measured” (charging time T2 *, discharging time T3 * and valve opening time T4 *).
- the charging time T2 * begins when the charging current + Ip exceeds the first threshold S1, ie at time t2; it ends at time t3 when the charging current + Ip falls below the first threshold value Sl again.
- the discharge duration T3 * begins when the discharge current -Ip falls below the second threshold value S2, ie at time t5; it ends at time t ⁇ when the discharge current -Ip again exceeds the second threshold value S2.
- t2-tl t5-t4 in a first approximation.
- a method for monitoring a capacitive actuator by means of “controlled” variables of charging duration T2 and discharging duration T3 derived from the actuator voltage Up is described.
- the charging time T2 extends from the start of the control signal st at the time t1 to the time t3 at which the actuator voltage Up exceeds the upper voltage threshold S3.
- the discharge duration T3 extends from the end of the control signal st at the time t4 to the time t ⁇ at which the discharge current -Ip again falls below the lower voltage threshold value S3.
- the opening time T4 * of the valve actuated by the actuator begins when the actuator voltage Up exceeds the upper voltage threshold S4. It ends at time t ⁇ , at which the actuator voltage Up falls below the lower voltage threshold S3 again.
- the predetermined, stored values are used for the charging and discharging duration.
- the method according to this third exemplary embodiment behaves in exactly the same way as the method according to the first exemplary embodiment.
- the method is carried out by means of the actuator Voltage Up derived, but "measured" quantities (charging time T2 *, discharging time T3 * and valve opening time T4 *) described.
- the charging time T2 * extends from the time t2 at which the actuator voltage Up exceeds the lower voltage threshold value S3 to the time t3 at which the actuator voltage Up exceeds the upper voltage threshold value S4.
- the discharge time T3 * extends from the time t5 at which the actuator voltage Up falls below the upper voltage threshold value S4 to the time t ⁇ at which the actuator voltage Up falls below the lower voltage threshold value S3 again.
- the opening period T4 * of the valve actuated by the actuator also begins in this exemplary embodiment when the actuator voltage Up exceeds the upper voltage threshold S4 and ends at time t ⁇ at which the actuator voltage Up falls below the lower voltage threshold S3 again.
- the charging time T2 or the discharge time T3 is longer or shorter than the predetermined value.
- the charging current + Ip or the discharging current -Ip begins to flow too early or too late; the charging time T2 * or the discharge time T3 * remains the same, it only shifts forward or backward, only the size T4 * changes: (T2 * + T4 *)> (Tl + T3 *) ⁇ (T2 * + T4 * - Tl - T3 *)>
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10028353A DE10028353C2 (de) | 2000-06-08 | 2000-06-08 | Verfahren zur Überprüfung eines kapazitiven Stellgliedes |
DE10028353 | 2000-06-08 | ||
PCT/DE2001/002136 WO2001094768A1 (de) | 2000-06-08 | 2001-06-07 | Verfahren zur überprüfung eines kapazitiven stellgliedes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1287250A1 true EP1287250A1 (de) | 2003-03-05 |
EP1287250B1 EP1287250B1 (de) | 2005-11-23 |
Family
ID=7645098
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01944976A Expired - Lifetime EP1287250B1 (de) | 2000-06-08 | 2001-06-07 | Verfahren zur überprüfung eines kapazitiven stellgliedes |
Country Status (4)
Country | Link |
---|---|
US (1) | US6853201B2 (de) |
EP (1) | EP1287250B1 (de) |
DE (1) | DE10028353C2 (de) |
WO (1) | WO2001094768A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10213875B4 (de) * | 2002-03-27 | 2006-12-28 | Siemens Ag | Verfahren und Vorrichtung zum Ansteuern wenigstens eines Piezoaktors |
DE10229394A1 (de) * | 2002-06-29 | 2004-01-29 | Robert Bosch Gmbh | Verfahren, Computerprogramm, Steuer- und/oder Regelgerät zum Betreiben einer Brennkraftmaschine, sowie Brennkraftmaschine |
DE10333154A1 (de) * | 2003-07-22 | 2005-02-24 | Vega Grieshaber Kg | Verfahren und Schaltungsanordnung zum Auswerten einer Messkapazität |
US7365411B2 (en) * | 2004-08-12 | 2008-04-29 | Micron Technology, Inc. | Resistance variable memory with temperature tolerant materials |
EP1927743A1 (de) | 2006-11-30 | 2008-06-04 | Delphi Technologies, Inc. | Fehlerdetektion in einer Injektoranordnung |
US7765877B2 (en) * | 2007-11-30 | 2010-08-03 | Caterpillar Inc | System for preloading piezoelectric actuators and method |
WO2015077410A1 (en) * | 2013-11-20 | 2015-05-28 | Eaton Corporation | Solenoid and associated control method |
CN106460703B (zh) * | 2014-05-13 | 2019-06-07 | 日立汽车系统株式会社 | 内燃机的燃料喷射装置 |
FR3055991B1 (fr) | 2016-09-14 | 2018-09-28 | Continental Automotive France | Procede de detection de defaillances |
WO2020151809A1 (en) * | 2019-01-22 | 2020-07-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Security for distributed networking |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1540216A (en) * | 1975-03-07 | 1979-02-07 | Cav Ltd | Controlling and monitoring the operation of fuel injection supply systems |
US4608958A (en) * | 1982-09-22 | 1986-09-02 | Nippon Soken, Inc. | Load reactance element driving device |
DE19711903C2 (de) * | 1997-03-21 | 1999-03-18 | Siemens Ag | Vorrichtung und Verfahren zum Ansteuern eines piezogesteuerten Kraftstoffeinspritzventils |
DE19733560B4 (de) * | 1997-08-02 | 2007-04-05 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Laden und Entladen eines piezoelektrischen Elements |
DE19845042C2 (de) * | 1998-09-30 | 2000-08-24 | Siemens Ag | Verfahren und Anordnung zur Diagnose eines kapazitiven Aktors |
DE19910389C2 (de) * | 1999-03-09 | 2001-09-27 | Dlw Ag | Trägerloses Linoleum-Flächengebilde und Verfahren zu dessen Herstellung |
DE19910388C2 (de) * | 1999-03-09 | 2001-03-29 | Siemens Ag | Verfahren zur Überprüfung eines kapazitiven Stellgliedes |
DE19944734B4 (de) * | 1999-09-17 | 2007-02-15 | Siemens Ag | Verfahren und Vorrichtung zum Laden wenigstens eines kapazitiven Stellgliedes |
US6556028B1 (en) * | 2001-05-07 | 2003-04-29 | Storage Test Solutions, Inc. | Method and apparatus for detecting defects in piezoelectric actuators |
-
2000
- 2000-06-08 DE DE10028353A patent/DE10028353C2/de not_active Expired - Fee Related
-
2001
- 2001-06-07 WO PCT/DE2001/002136 patent/WO2001094768A1/de active IP Right Grant
- 2001-06-07 EP EP01944976A patent/EP1287250B1/de not_active Expired - Lifetime
-
2002
- 2002-12-06 US US10/313,397 patent/US6853201B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0194768A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1287250B1 (de) | 2005-11-23 |
DE10028353C2 (de) | 2003-02-20 |
WO2001094768A1 (de) | 2001-12-13 |
US6853201B2 (en) | 2005-02-08 |
US20030078744A1 (en) | 2003-04-24 |
DE10028353A1 (de) | 2001-12-20 |
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