EP4587691A1 - Verfahren zum betreiben eines gasinjektors - Google Patents
Verfahren zum betreiben eines gasinjektorsInfo
- Publication number
- EP4587691A1 EP4587691A1 EP23736317.1A EP23736317A EP4587691A1 EP 4587691 A1 EP4587691 A1 EP 4587691A1 EP 23736317 A EP23736317 A EP 23736317A EP 4587691 A1 EP4587691 A1 EP 4587691A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection
- gas injector
- phase
- post
- magnetic 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.)
- Withdrawn
Links
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
- F02D19/021—Control of components of the fuel supply system
- F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/024—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
-
- 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
- F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
- F02D2041/2006—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost capacitor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Definitions
- the present invention relates to a method for operating a gas injector of an internal combustion engine during a post-injection after a main injection of the gas injector.
- Gas injectors are known from the prior art in different designs.
- One problem with gas injectors that inject a gaseous fuel is that post-injection should be possible in order to reduce exhaust emissions and reduce fuel requirements.
- post-injection should be carried out in order to enable a rapid response, in particular of a turbocharger.
- a problem with the post-injection is an increased combustion chamber pressure with directly injecting gas injectors, since the post-injection is usually carried out shortly after the internal combustion engine reaches top dead center. The increased combustion chamber pressure thus provides an additional closing force on the gas injector, which must also be overcome when post-injection is carried out.
- a magnetic circuit of a magnetic actuator of the gas injector has been dimensioned in such a way that a sufficient magnetic force is also present during the post-injection.
- a current level can be increased during the post-injection in order to provide the force required by the magnetic actuator during the post-injection.
- the force required during the post-injection of the magnetic actuator to open the gas injector must overcome a restoring force of a restoring spring and the combustion chamber pressure, with the magnetic actuator being supported by the system pressure of the gaseous fuel to be injected in the gas injector. This means that the force required by the magnetic actuator to open during post-injection must be greater than the sum of the restoring force of the spring and the combustion chamber pressure minus the system pressure in the gas injector.
- the same or higher current level is present in the boost phase of the post-injection as in the main injection, with the increased power requirement in particular in the pick-up phase of the post-injection being provided by a boost capacitor and/or a DC/DC converter.
- the boost current duration of the secondary injection is preferably the same or greater than in the main injection. This means that a higher starting current level is preferably achieved during the secondary injection compared to the main injection.
- the increased power requirement in the pick-up phase is preferably provided by a DC/DC converter and/or a boost capacitor.
- the boost capacitor was charged during normal operation of the internal combustion engine and can therefore provide the increased power requirement during post-injection.
- the current level in the boost phase is increased in the post-injection compared to the main injection of the gas injector.
- a higher current level is achieved than in comparison with the main injection of the gas injector, whereby the current level in the pick-up phase during the post-injection can also be easily maintained at a higher level than in comparison with the main injection.
- a length of the boost phase during the post-injection is extended in comparison to the main injection of the gas injector. This stands More time is available to achieve a higher absolute current level in the boost phase during the secondary injection compared to the main injection.
- a holding phase during the post-injection of the gas injector, in which the gas injector is kept open, is preferably extended in comparison to the main injection of the gas injector.
- the holding current level in the holding phase of the post-injection of the gas injector, in which the gas injector is kept open is the same or higher compared to the main injection of the gas injector.
- an injection cycle of the internal combustion engine exclusively comprises a main injection and a secondary injection. This means that the injection cycle does not include any pre-injection.
- the method according to the invention is further preferably used when a load point of the internal combustion engine changes and in particular when the speed of the internal combustion engine increases.
- the post-injection takes place exclusively after reaching the top dead center of a piston of the internal combustion engine.
- the present invention further relates to a control device which is set up to carry out the steps of the method according to the invention.
- the invention relates to a computer program with a program code which carries out steps of the method according to the invention when the computer program runs on a computer or a corresponding computing unit, for example on a control device according to the invention.
- Figure 1 is a schematic diagram showing the voltage and the
- Figure 3 shows a longitudinal section through a gas injector, which is used for
- the current supply to the magnetic coil 3 is stopped, so that the restoring element 8 returns the armature 2 to the starting position shown in FIG.
- the valve spring 7 also returns the closing element 4 to the closed position shown in FIG.
- the diagram in Figure 1 shows a main injection of the gas injector 1 for injecting gaseous fuel, in particular hydrogen, directly into a combustion chamber of an internal combustion engine.
- the gas injector and the magnetic actuator basically go through four phases, namely a boost phase A, a tightening phase B, a holding phase C and a closing phase D.
- the boost phase A during the main injection of the internal combustion engine ends after time t1
- the tightening phase B ends after the time t2 has elapsed
- the holding phase C ends after the time elapsed t3
- the closing phase D ends after the time elapsed t4 .
- the absolute value IT is also greater than the value 11 for the main injection at the end of the boost phase.
- This can be achieved by sizing a DC/DC converter and/or a boost capacitor.
- the DC/DC converter and the boost capacitor are dimensioned in such a way that all relevant operating points of the gas injector can be served during the main injection ( Figure 1).
- the energy reserves from the DC/DC converter and/or the boost capacitor are used for the control shown in FIG. 2 to increase the current level (curve K1 in FIG. 2 in the pick-up phase B').
- the higher current level 11 'during post-injection also provides an increased opening force of the magnetic actuator, which can be seen by comparing the force curves K3 between FIG. 1 and FIG. 2. This makes it possible to compensate for the missing force needed to open the gas injector during post-injection due to the high combustion chamber pressure in the gas injector.
- all four curves K1, K2, K3 and K4 are the same again. If necessary, however, the holding current level in the holding phase C' can be increased in order to counteract the increased closing forces K5 in Figure 2.
- control variants are also conceivable in which the current curve in the boost phase A' during the secondary injection is the same as during the main injection and then the compensation is only realized by the magnetic force in the pickup phase B' with increased current.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022209619.3A DE102022209619A1 (de) | 2022-09-14 | 2022-09-14 | Verfahren zum Betreiben eines Gasinjektors |
| PCT/EP2023/067842 WO2024056228A1 (de) | 2022-09-14 | 2023-06-29 | Verfahren zum betreiben eines gasinjektors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4587691A1 true EP4587691A1 (de) | 2025-07-23 |
Family
ID=87070885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23736317.1A Withdrawn EP4587691A1 (de) | 2022-09-14 | 2023-06-29 | Verfahren zum betreiben eines gasinjektors |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4587691A1 (de) |
| KR (1) | KR20250065905A (de) |
| CN (1) | CN119895135A (de) |
| DE (1) | DE102022209619A1 (de) |
| WO (1) | WO2024056228A1 (de) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7040281B2 (en) * | 2000-10-22 | 2006-05-09 | Westport Research Inc. | Method of injecting a gaseous fuel into an internal combustion engine |
| DE10321794A1 (de) * | 2003-05-14 | 2004-12-09 | Bayerische Motoren Werke Ag | Verfahren zum Betreiben einer Brennkraftmaschine |
| WO2007090228A1 (en) * | 2006-02-06 | 2007-08-16 | Orbital Australia Pty Limited | Fuel injection apparatus |
| DE102014224333A1 (de) * | 2014-11-28 | 2016-06-02 | Robert Bosch Gmbh | Verfahren zum Einblasen von gasförmigem Kraftstoff direkt in einen Brennraum einer Brennkraftmaschine |
-
2022
- 2022-09-14 DE DE102022209619.3A patent/DE102022209619A1/de active Pending
-
2023
- 2023-06-29 CN CN202380066172.6A patent/CN119895135A/zh active Pending
- 2023-06-29 KR KR1020257011914A patent/KR20250065905A/ko active Pending
- 2023-06-29 EP EP23736317.1A patent/EP4587691A1/de not_active Withdrawn
- 2023-06-29 WO PCT/EP2023/067842 patent/WO2024056228A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| KR20250065905A (ko) | 2025-05-13 |
| CN119895135A (zh) | 2025-04-25 |
| WO2024056228A1 (de) | 2024-03-21 |
| DE102022209619A1 (de) | 2024-03-14 |
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Legal Events
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