CN105545512B - Method for energizing a magnetic valve of a fuel injector - Google Patents
Method for energizing a magnetic valve of a fuel injector Download PDFInfo
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- CN105545512B CN105545512B CN201510691941.9A CN201510691941A CN105545512B CN 105545512 B CN105545512 B CN 105545512B CN 201510691941 A CN201510691941 A CN 201510691941A CN 105545512 B CN105545512 B CN 105545512B
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- signal
- fuel injector
- valve
- switching valve
- ncs
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- 239000000446 fuel Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004590 computer program Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000009760 functional impairment Effects 0.000 description 1
- XULSCZPZVQIMFM-IPZQJPLYSA-N odevixibat Chemical compound C12=CC(SC)=C(OCC(=O)N[C@@H](C(=O)N[C@@H](CC)C(O)=O)C=3C=CC(O)=CC=3)C=C2S(=O)(=O)NC(CCCC)(CCCC)CN1C1=CC=CC=C1 XULSCZPZVQIMFM-IPZQJPLYSA-N 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
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
- 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
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
- F02M51/0639—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature acting as a valve
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0073—Pressure balanced valves
-
- 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
- F02D2041/2017—Output circuits, e.g. for controlling currents in command coils using means for creating a boost current or using reference switching
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/063—Lift of the valve needle
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/24—Fuel-injection apparatus with sensors
- F02M2200/247—Pressure sensors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a method for energizing a magnetic valve of a fuel injector. The method comprises energizing the switching valve with a predetermined current profile, acquiring a signal (U _ NCS) representative of a pressure profile in a valve chamber of the fuel injector during switching of the switching valve, and varying the predetermined current profile in dependence on the signal (U _ NCS).
Description
Technical Field
The invention relates to a method for energizing a magnetic valve of a fuel injector. The invention also relates to a computer program which is provided to carry out each step of the method according to the invention, and to a machine-readable storage medium on which the computer program according to the invention is stored. Finally, the invention relates to an electronic control unit which is provided for energizing a solenoid valve of a fuel injector by means of the method according to the invention.
Background
In order to open an internally open magnetic high-pressure injection valve in a device for carrying out direct fuel injection, a boost phase is required on the basis of the high system pressure, in which the current flowing through the fuel injector is increased to a value of approximately 16 amperes. This serves to rapidly provide an increased magnetic force in order to achieve a robust, reproducible opening of the switching valve of the fuel injector. In order to compensate for temperature-induced fuel influences which are otherwise manifested by a slow opening of the magnetic valve, the function of the fuel injector is controlled in such a way that, as a function of a temperature threshold, for example-5 ℃, the current value in the start phase immediately after the boost phase is increased or the boost phase is lengthened.
If there are extremely low temperatures, for example below-20 ℃, or a vehicle in which the fuel injector is installed is being refueled with the wrong fuel, for example replacing winter diesel with B0, the on-off valve will open significantly more slowly than under normal conditions. If the boost current is switched to the start or holding current before the maximum stroke of the needle of the fuel injector is reached, functional impairment and increased deviation or minimum quantities occur. This may even result in the pre-injection disappearing.
Disclosure of Invention
The method according to the invention for energizing a switching valve of a fuel injector comprises the following steps:
-energizing the switching valve with a predetermined current profile,
-acquiring a signal representative of a pressure profile within a valve chamber of a fuel injector during switching of a switching valve, and
-changing the predetermined current profile in dependence on the signal.
By detecting the switching characteristics of the switching valve, the current profile can be controlled or adjusted depending on the valve characteristics and the fuel properties or environmental conditions, such as temperature.
Preferably, the predetermined current profile for the boost phase of the on-off valve is varied as a function of the signal. It is particularly preferred to vary the duration of the boost phase. This makes it possible, under particularly unfavorable operating conditions, to extend the boost phase until it is ensured that the maximum stroke of the needle of the fuel injector is reached in the boost phase before the starting current is switched over.
It is also preferred that the predetermined current profile for the start phase of the switching valve is changed as a function of the signal.
It is particularly preferred to vary the current level during the start-up phase. It is also particularly preferred to vary the duration of the start-up phase. The length of the boost phase is additionally limited by the maximum power loss or coil temperature within the valve coil and the discharge of the boost capacitor. When the maximum length is reached, the starting current is switched, but in this case its level may be increased to provide more magnetic force without overheating the magnet coil.
The signal is preferably a signal of a needle closure sensor (Nadelschlie beta sensor) of the fuel injector, which is used in a fuel injector with a pressure-balanced switching valve. Since the needle closure sensor provides a voltage signal which, after subtraction of the offset, corresponds to the chamber pressure, the switching behavior and/or the fuel properties of the switching valve can be deduced from the signal curve.
The predetermined current profile can preferably be changed as a function of the height and the point in time of occurrence of the minimum in the profile of the signal after the opening of the switching valve, since these data enable the end of the boost phase to be adjusted. For this purpose, the data can be compared in particular with a reference characteristic line.
It is also preferred that the predetermined current profile is changed as a function of the gradient of the signal after the switching valve has opened. This gradient can also be compared with a reference characteristic line.
The computer program according to the invention is provided for carrying out each step of the method according to the invention, in particular when the method is run on a computer or a controller. This allows the method according to the invention to be implemented on existing controllers without structural changes being necessary. For this purpose, it is stored on a machine-readable storage medium according to the invention.
If the computer program according to the invention is displayed on a conventional electronic control unit, a control unit according to the invention is obtained which is provided for energizing the switching valve of the fuel injector by means of the method according to the invention.
Drawings
One embodiment of the invention is illustrated in the accompanying drawings and explained in detail in the following description.
FIG. 1 is a cross-sectional view of a fuel injector whose on-off valve may be energized by a method according to an embodiment of the present invention;
FIG. 2 shows a detail section of the fuel injector according to FIG. 1;
FIG. 3 shows a diagram of a current curve during the energization of the switching valve of the fuel injector according to FIG. 1;
FIG. 4 shows a diagram of the minimum value of the initial voltage of the needle closure sensor which is detected in an exemplary embodiment of the method according to the invention;
fig. 5 shows a graph of the gradient of a curve for the initial voltage of the needle closure sensor, obtained in an exemplary embodiment of the method according to the invention.
Detailed Description
A further exemplary embodiment of the present invention is described by way of a regulation of the fuel injector 10 known from DE 102009029549 a1 and shown in fig. 1. The fuel injector 10 comprises an injector body 11 in which a valve piston 12 is arranged. This valve piston is guided in the valve member 13 at the upper end. Its lower end extends in the direction of the nozzle 14. The valve piston 12 is connected to a valve needle 15 of a needle valve 16, which is arranged inside the nozzle 14. Furthermore, the valve piston 12 is connected to a high-pressure bore 17 and to a return bore 18. At the upper end of the fuel injector 10, a magnetic head 19 connected to the switching valve, an armature assembly 20 and a return path 21 are arranged. Fuel injector 10 is furthermore connected via an electrical connection 22 to a source of electrical energy (not shown) and via a high-pressure connection 23, which comprises a high-pressure slot filter, to a fuel supply line (not shown).
During operation of the fuel injector 10, it is provided that the magnetic head 19 of the switching valve is energized with a current I _ MV, so that the armature set 20 is moved toward the magnetic head. Thereby opening the connection between the control chamber 24 above the valve piston 12 and the circuit 21. This connection triggers a drop in pressure in the control chamber 24 and thus an opening movement of the composite structure formed by the valve piston 12 and the valve needle 15. The opening of the needle valve 16 establishes a connection between the high-pressure bore 17 and the nozzle bore of the nozzle 14, as a result of which fuel is supplied to the nozzle 14 and injected into the cylinder of the internal combustion engine.
According to fig. 2, a high-pressure chamber 25 and a low-pressure chamber 26 are arranged inside the injector body 11. The two chambers are separated from each other by a valve member 13. The high-pressure chamber 25 communicates with the high-pressure joint 23. The low pressure chamber 26 is connected to the fuel tank via the return passage 21. The high-pressure chamber 25 is connected to the nozzle 14. The end of the valve piston 12 remote from the nozzle is arranged as a plunger in a control chamber 24 provided in the valve member 13. The control chamber 24 communicates with the high-pressure chamber 25 via a supply throttle 27 and with the low-pressure chamber 26 via a throttled outflow channel 28, wherein the outflow channel 28 is controlled by means of a switching valve 29. When the outflow channel 28 is blocked by means of the switching valve 29 and the valve needle 15 is in its closing position, the same high pressure prevails in the control chamber 24 as in the high-pressure chamber 25, as a result of which the valve piston 12 is pressed downwards and the valve needle 15 connected thereto is held in the closing position of the blocking needle 16. If the outflow channel 28 is opened by means of the switching valve 29, a reduced pressure prevails in the control chamber 24 relative to the high pressure in the high-pressure chamber 25, and the valve piston 12 and the valve needle 15 move together in the upward direction, i.e. the valve needle 15 is set to its open position, so that fuel is injected into the combustion chamber through the nozzle 14.
The switching valve 29 has a sleeve-like closing body 30, which is tensioned by a closing spring 34 embodied as a helical compression spring against a support concentric with the outlet of the outflow channel 28. In the example of fig. 2, the abutment is configured as a flat surface on which a sleeve-like closing body 30 with a linear annular edge is mounted. The sleeve-like closing body 30 is guided in an axially displaceable manner on a guide rod 31 which is coaxial to the longitudinal axis L of the injector body 11, wherein the annular gap between the inner circumference of the closing body 30 and the outer circumference of the guide rod 31 is designed as a virtually leakage-free throttling or sealing gap. When the closing body 30 assumes the closed position shown in fig. 2, the valve chamber 32 formed inside the closing body 30, which communicates with the control chamber 24 via the outflow channel 28 and then accordingly has the same fluid pressure as the control chamber 24, is interrupted by the relatively low-pressure chamber 26.
The valve chamber pressure is led out by means of the guide rod 31 to a small piezo element as needle closure sensor 33. The electrical terminals of the pin closure sensor 33 are connected to externally accessible plug contacts, so that the voltage supplied by the pin closure sensor 33 is read as the signal U _ NCS. This minus the offset voltage is proportional to the pressure within the valve chamber 32. The offset voltage is variable in time, but only subject to significantly slower fluctuations than when under pressure in the valve chamber 32. The read voltage is further transmitted to a controller that controls the fuel injector 10. A computer program is run on this fuel injector, which executes all the steps of the method according to the present exemplary embodiment of the present invention.
Fig. 3 shows how, in a first exemplary embodiment of the method according to the invention, the current I _ MV in the boost phase t _ boost is increased to a value 16A when the magnetic head 19 of the switching valve 29 is first energized. After the end of the boost phase, the current I _ MV is held at a constant value for the start phase t _ anzug. The current intensity in the start-up phase is selected in dependence on a temperature threshold of the ambient temperature. The difference between the current curves 40, 41 is a predetermined value Δ 1_ MV for ambient temperatures above and below-5 ℃.
During this energization in the boost phase and in the start phase, the initial voltage U _ NCS of the needle closure sensor 33 is read. As shown in fig. 4, this initial voltage reaches a local minimum 50 with a voltage U _ min _ sv _ open at the time t _ min _ sv _ open. Above this the end of the boost phase can be adjusted. In addition, an added time share t _ addtl can be supplemented. The duration of the boost/start-up phase is given by equation 1, since the duration of the boost phase is constant:
t _ boost + t _ anzug = t _ min _ sv _ open + t _ addtl (formula 1).
If the duration of the start phase detected deviates from the reference characteristic by at least one predetermined threshold value, the starting current, i.e. the current level I _ MV, is increased during the start phase for the next energization of the switching valve 29 in proportion to this deviation.
The duration of the start-up phase can be predetermined or regulated in a controlled manner.
The gradient dU/dt of the voltage U _ NCS after the opening of the switching valve 29 can be used as a further criterion. If the gradient deviates from the reference characteristic by more than a threshold value, the starting current can likewise be changed.
Claims (10)
1. A method for energizing an on-off valve (29) of a fuel injector (10), comprising the steps of:
-energizing the switching valve (29) with a predetermined current profile,
-acquiring a signal (U _ NCS) representative of a pressure profile within a valve chamber (32) of the fuel injector (10) during switching of the switching valve (29), and
-changing the predetermined current profile in dependence on the signal (U _ NCS), wherein the predetermined current profile for the boost phase of the switching valve (29) is changed in dependence on said signal (U _ NCS), wherein after the boost phase has ended the current is kept to a constant value for the start phase, and wherein the current intensity in the start phase is selected in dependence on a temperature threshold of the ambient temperature.
2. Method according to claim 1, characterized in that the duration (t _ boost) of the boost phase is changed.
3. Method according to claim 1 or 2, characterized in that the predetermined current profile for the start phase of the switching valve (29) is changed as a function of the signal (U _ NCS).
4. Method according to claim 3, characterized in that the duration (t _ anzug) of the start-up phase is changed.
5. A method as claimed in claim 3, characterized in that the current level in the starting phase is varied.
6. Method according to claim 1 or 2, characterized in that the signal (U _ NCS) is a signal of a needle closing sensor (33) of the fuel injector (10).
7. Method according to claim 1 or 2, characterized in that the predetermined current profile is changed as a function of the height (U _ min _ sv _ open) and the point in time of occurrence (t _ min _ sv _ open) of the minimum (50) in the profile of the signal (U _ NCS) after the opening of the switching valve (29).
8. Method according to claim 1 or 2, characterized in that the predetermined current profile is changed in dependence on the gradient (dU/dt) of the signal (U _ NCS) after the opening of the switching valve (29).
9. A machine-readable storage medium, on which a computer program is stored, which computer program is set up to carry out each step of the method according to any one of claims 1 to 8.
10. An electronic control unit, which is provided for energizing a switching valve (29) of a fuel injector (10) by means of a method according to one of claims 1 to 8.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014221706.7A DE102014221706A1 (en) | 2014-10-24 | 2014-10-24 | Method for supplying power to a solenoid valve of a fuel injector |
| DE102014221706.7 | 2014-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105545512A CN105545512A (en) | 2016-05-04 |
| CN105545512B true CN105545512B (en) | 2021-06-18 |
Family
ID=55698346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510691941.9A Active CN105545512B (en) | 2014-10-24 | 2015-10-23 | Method for energizing a magnetic valve of a fuel injector |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105545512B (en) |
| DE (1) | DE102014221706A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020208056B3 (en) * | 2020-06-29 | 2021-06-10 | Robert Bosch Gesellschaft mit beschränkter Haftung | Method for determining and using a fuel injector-specific parameter of a fuel injector |
| DE102021205381A1 (en) | 2021-05-27 | 2022-12-01 | Robert Bosch Gesellschaft mit beschränkter Haftung | Process for characterizing fuel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19930309A1 (en) * | 1999-07-01 | 2001-01-11 | Siemens Ag | Controlling quantity of fuel injected by valve with piezoelement actuator |
| EP1541840A2 (en) * | 2003-12-09 | 2005-06-15 | Siemens Aktiengesellschaft | Method for operating an actuator of an injection valve and injection valve |
| WO2005119038A1 (en) * | 2004-06-03 | 2005-12-15 | Siemens Aktiengesellschaft | Method and device for controlling an injection valve |
| CN103270279A (en) * | 2010-10-14 | 2013-08-28 | 大陆汽车有限公司 | Method for determining the opening point in time of a fuel injector |
| CN103299055A (en) * | 2011-01-17 | 2013-09-11 | 罗伯特·博世有限公司 | Method for actuating an injector in a fuel injection system in an internal combustion engine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006059625A1 (en) * | 2006-12-14 | 2008-06-19 | Robert Bosch Gmbh | Device and method for controlling an electromagnetic valve |
| DE102009029549A1 (en) | 2009-09-17 | 2011-03-24 | Robert Bosch Gmbh | Method for determining a time |
| JP5838074B2 (en) * | 2011-11-08 | 2015-12-24 | 日立オートモティブシステムズ株式会社 | Fuel injection control device for internal combustion engine |
-
2014
- 2014-10-24 DE DE102014221706.7A patent/DE102014221706A1/en active Pending
-
2015
- 2015-10-23 CN CN201510691941.9A patent/CN105545512B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19930309A1 (en) * | 1999-07-01 | 2001-01-11 | Siemens Ag | Controlling quantity of fuel injected by valve with piezoelement actuator |
| EP1541840A2 (en) * | 2003-12-09 | 2005-06-15 | Siemens Aktiengesellschaft | Method for operating an actuator of an injection valve and injection valve |
| WO2005119038A1 (en) * | 2004-06-03 | 2005-12-15 | Siemens Aktiengesellschaft | Method and device for controlling an injection valve |
| CN103270279A (en) * | 2010-10-14 | 2013-08-28 | 大陆汽车有限公司 | Method for determining the opening point in time of a fuel injector |
| CN103299055A (en) * | 2011-01-17 | 2013-09-11 | 罗伯特·博世有限公司 | Method for actuating an injector in a fuel injection system in an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014221706A1 (en) | 2016-04-28 |
| CN105545512A (en) | 2016-05-04 |
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