EP1537318A1 - Verfahren zum betrieb einer brennkraftmaschine - Google Patents
Verfahren zum betrieb einer brennkraftmaschineInfo
- Publication number
- EP1537318A1 EP1537318A1 EP03793447A EP03793447A EP1537318A1 EP 1537318 A1 EP1537318 A1 EP 1537318A1 EP 03793447 A EP03793447 A EP 03793447A EP 03793447 A EP03793447 A EP 03793447A EP 1537318 A1 EP1537318 A1 EP 1537318A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion engine
- internal combustion
- piezoelectric actuator
- control signal
- control
- 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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000002347 injection Methods 0.000 claims abstract description 48
- 239000007924 injection Substances 0.000 claims abstract description 48
- 239000000446 fuel Substances 0.000 claims abstract description 14
- 238000004590 computer program Methods 0.000 claims description 9
- 230000006870 function Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims 1
- 238000011017 operating method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000003068 static 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
- F02D41/20—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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/005—Fuel-injectors combined or associated with other devices the devices being sensors
Definitions
- the present invention relates to a method for operating an internal combustion engine with at least one injection valve,. to which is assigned a piezoelectric actuator which is supplied with a control signal by a control unit of the internal combustion engine and which causes a needle stroke of a valve needle of the injection valve corresponding to the control signal for a fuel injection.
- the present invention relates to a control device for an internal combustion engine with at least one
- Injection valve to which is assigned a piezoelectric actuator which is supplied with a control signal by the control unit and which causes a needle stroke of a valve needle of the injection valve corresponding to the control signal for a fuel injection.
- the present invention relates to a computer program for a control device Internal combustion engine with at least one injection valve, to which is assigned a piezoelectric actuator which is supplied with a control signal by the control device and which causes a needle stroke of a valve needle of the injection valve corresponding to the control signal for a fuel injection.
- an upper speed limit is defined for the internal combustion engine, which limits the maximum output of the internal combustion engine.
- the power output stage usually comprises a direct current-direct current (DC / DC) converter, the performance of which cannot be increased arbitrarily from a cost point of view and because of the available installation space. From the above-mentioned upper speed limit, the drive power of the DC / DC converter is no longer sufficient to compensate for the loss of energy converted in the piezoelectric actuators. In addition, the control unit can reach impermissibly high temperatures due to the heating of the DC / DC converter.
- DC / DC direct current-direct current
- this object is achieved according to the invention in that the control signal is changed as a function of a control power consumed by the piezoelectric actuator.
- the mechanical expansion of the corresponding piezoelectric actuator and thus the needle stroke of the corresponding injection valve is also reduced.
- the loss of energy converted in the piezoelectric actuator with a smaller needle stroke is smaller than when the actuator is actuated with the reference value, so that when the operating method according to the invention is used, a smaller amount of thermal energy must also be dissipated from the actuator.
- the energy dissipated in the power output stage is reduced, which also lowers the control unit temperature.
- the injection time must be increased accordingly in order to use the Inject the method according to the invention with a reduced needle stroke into the same amount of fuel into a combustion chamber of the internal combustion engine as with a conventional control.
- a limit for a minimum needle stroke or a corresponding minimal control signal must be set.
- Another, very special advantage of the operating method according to the invention is the possibility of increasing the performance of the internal combustion engine, which results from the fact that the upper speed limit for multiple injections is increased compared to conventional methods.
- a Predeterminable maximum control power when a Predeterminable maximum control power reduces the control signal to a maximum value.
- the maximum drive power corresponds, for example, to a predetermined maximum speed of the internal combustion engine in the case of multiple injection.
- the maximum value is a reduction of the needle stroke, so that the speed of the internal combustion engine can be increased with multiple injection with the same power loss in the piezoelectric actuator.
- a very particularly simple embodiment of the method according to the invention is characterized in that the maximum value is a constant.
- the control signal for the piezoelectric actuator is set to the constant maximum value when the predefinable maximum control power or a corresponding maximum speed is exceeded.
- the maximum value is dependent on one
- Characteristic selected which is stored, for example, in a memory of the control unit.
- the characteristic curve like the constant maximum value, can be applied, so that a change in the relevant values even after the initial start-up of the
- the maximum control power can also preferably be applied to increase flexibility.
- control power consumed by the piezoelectric actuator is calculated from operating variables of the internal combustion engine. That way is one Monitoring of the control power required for operating the actuator is possible, the control power being determinable solely from variables that are all present in the control unit of the internal combustion engine, namely: the energy loss of the actuator per needle stroke, the number of injections per cycle and the speed of the internal combustion engine.
- the drive power consumed by the piezoelectric actuator is measured.
- the amount of charge flowing onto the piezoelectric actuator and the corresponding charging time as well as, if necessary, other quantities are recorded.
- a control device for an internal combustion engine with at least one injection valve, to which a piezoelectric actuator, which is supplied with a control signal by the control device, is assigned, which causes a needle stroke of a valve needle of the injection valve for a fuel injection corresponding to the control signal ,
- the control signal can be changed as a function of a control power consumed by the piezoelectric actuator.
- FIG. 1 shows a flow chart of an embodiment of the method according to the invention
- FIG. 2 shows an internal combustion engine according to the invention
- FIG. 3 shows an injection valve of the internal combustion engine from FIG. 2.
- FIG. 1 shows an embodiment of the method according to the invention, which is used in an internal combustion engine 10 shown in broken lines in FIG. 2 in order to increase a maximum speed and thus also a maximum output of the internal combustion engine 10.
- the internal combustion engine 10 has injection valves 30a, 30b, 30c, which inject fuel from a fuel rail 26 directly into combustion chambers 32a, 32b, 32c of the cylinders 33a, 33b, 33c.
- the injection valves 30a, 30b, 30c are controlled by a control unit 34 of the internal combustion engine 10.
- injection valves 30a, 30b, 30c The exact structure of the injection valves 30a, 30b, 30c results from FIG. 3, in which an injection valve 30 is shown as an example.
- Each of the injection valves 30a, 30b, 30c has a piezoelectric actuator 58, the one Drives valve needle 44 of the respective injection valve 30a, 30b, 30c.
- valve needle 44 which is also referred to as the needle stroke, is proportional to a control signal with which piezoelectric actuator 58 is acted upon by control unit 34 (FIG. 2) of internal combustion engine 10 via lines 70 (FIG. 3).
- the control signal is generated within the control unit 34 by a DC / DC converter (not shown), which in the present case supplies all of the piezoelectric actuators 58 of the injection valves 30a, 30b, 30c (FIG. 2) of the internal combustion engine 10 with the control signal. Since the piezoelectric actuators 58 are components with essentially capacitive properties, when they are actuated, they flow with the DC / DC converter (not shown), which in the present case supplies all of the piezoelectric actuators 58 of the injection valves 30a, 30b, 30c (FIG. 2) of the internal combustion engine 10 with the control signal. Since the piezoelectric actuators 58 are components with essentially capacitive properties, when they are actuated, they flow with the
- Control signal an amount of electrical charge proportional to the control signal to / from the actuators (s) 58.
- the electrical energy to be applied by the DC / DC converter for controlling the piezoelectric actuators 58 which is referred to below as total actuation energy, results from the product of the number of cylinders 33a, 33b, 33c of internal combustion engine 10, and the power loss of an actuator 58 as a function of it the needle stroke, the number of activations of the actuator 58 per injection cycle and the speed of the internal combustion engine 10.
- Total control energy corresponding control power evaluated by the piezoelectric actuators 58 of the injection valves 30a, 30b, 30c of the internal combustion engine 10 is recorded in order to move the valve needle 44 of the respective injection valve 30a, 30b, 30c.
- the DC / DC converter contained in the control unit 34 can provide the total control energy in the time specified by the speed of the internal combustion engine 10, which in step 120 of FIG. 1 by comparing the control power actually consumed by the actuators 58 with an applicable, predetermined maximum Control power is queried, the needle stroke of the injection valves 30a, 30b, 30c is specified according to the subsequent step 130 in a conventional manner, ie the maximum needle stroke of the valve needles 44 is predetermined by the control signal.
- step 150 fuel is injected into the combustion chambers 32a, 32b, 32c of the cylinders 33a, 33b, 33c (FIG. 2).
- the piezoelectric actuators 58 no longer controlled conventionally, but, as can be seen from FIG. 1, the method branches first to query step 140.
- the piezoelectric actuators 58 are activated after the query 140 with a reduced control signal, which results in a reduced needle stroke and thus a lower overall control energy.
- the drive time is extended accordingly.
- step 140 the control unit 34 of the internal combustion engine 10 queries a status flag which states how the needle stroke of the injection valves 30a, 30b, 30c is to be limited.
- the control signal can be set to a constant maximum value in step 142.
- the constant maximum value and the characteristic curve can be applied so that adjustments to the stored values are possible at any time.
- step 130 the fuel is injected into the combustion chambers 32a, 32b, 32c of the cylinders 33a, 33b, 33c according to step 150 even after the control signal has been specified in one of the steps 142, 144.
- the internal combustion engine 10 can also be operated at a higher speed using the control according to the invention with a reduced needle stroke, without the total control energy to be applied by the DC / DC converter takes impermissibly high values. In this case, there is an increase in performance of the internal combustion engine 10.
- control power actually required by the actuators 58 which is actually required by the actuators 58, is determined in step 120 by a calculation from the operating variables of the internal combustion engine 10, as has already been described.
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 |
|---|---|---|---|
| DE10240493 | 2002-09-03 | ||
| DE2002140493 DE10240493A1 (de) | 2002-09-03 | 2002-09-03 | Verfahren zum Betrieb einer Brennkraftmaschine |
| PCT/DE2003/002254 WO2004022957A1 (de) | 2002-09-03 | 2003-07-07 | Verfahren zum betrieb einer brennkraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1537318A1 true EP1537318A1 (de) | 2005-06-08 |
| EP1537318B1 EP1537318B1 (de) | 2007-09-26 |
Family
ID=31502282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03793447A Expired - Lifetime EP1537318B1 (de) | 2002-09-03 | 2003-07-07 | Verfahren zum betrieb einer brennkraftmaschine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1537318B1 (de) |
| JP (1) | JP2005537431A (de) |
| DE (2) | DE10240493A1 (de) |
| ES (1) | ES2291732T3 (de) |
| WO (1) | WO2004022957A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004012428A1 (de) * | 2003-09-23 | 2005-04-28 | Bosch Gmbh Robert | Verfahren, Computerprogramm und Vorrichtung zum Betreiben einer Brennkraftmaschine |
| EP2045459B1 (de) * | 2007-10-04 | 2012-03-07 | Delphi Technologies Holding S.à.r.l. | Verfahren zum Steuern einer Kraftstoffeinspritzvorrichtung |
| DE102009052487B4 (de) | 2009-11-09 | 2019-10-10 | Continental Automotive Gmbh | Verfahren zum Betreiben eines Steuergerätes für eine Brennkraftmaschine |
| DE102010042844B4 (de) | 2010-10-25 | 2022-02-03 | Robert Bosch Gmbh | Verfahren zur Überwachung eines Steuergeräts für eine Einspritzanlage in einem Kraftfahrzeug |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04128518A (ja) * | 1990-09-18 | 1992-04-30 | Toyota Motor Corp | 内燃機関用燃料供給ポンプ制御装置 |
| DE19644521A1 (de) * | 1996-10-25 | 1998-04-30 | Siemens Ag | Verfahren und Vorrichtung zum Ansteuern eines kapazitiven Stellgliedes |
| EP1139449A1 (de) * | 2000-04-01 | 2001-10-04 | ROBERT BOSCH GmbH | Brennstoffeinspritzanlage |
| DE10106170A1 (de) * | 2001-02-10 | 2002-08-14 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Ansteuerung eines Einspritzventils |
-
2002
- 2002-09-03 DE DE2002140493 patent/DE10240493A1/de not_active Withdrawn
-
2003
- 2003-07-07 ES ES03793447T patent/ES2291732T3/es not_active Expired - Lifetime
- 2003-07-07 EP EP03793447A patent/EP1537318B1/de not_active Expired - Lifetime
- 2003-07-07 JP JP2004533196A patent/JP2005537431A/ja active Pending
- 2003-07-07 WO PCT/DE2003/002254 patent/WO2004022957A1/de not_active Ceased
- 2003-07-07 DE DE50308287T patent/DE50308287D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004022957A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50308287D1 (de) | 2007-11-08 |
| DE10240493A1 (de) | 2004-03-11 |
| EP1537318B1 (de) | 2007-09-26 |
| JP2005537431A (ja) | 2005-12-08 |
| ES2291732T3 (es) | 2008-03-01 |
| WO2004022957A1 (de) | 2004-03-18 |
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