EP1132610A1 - Vorrichtung zur Regelung des Zerstäubungsgrades von Brennstofftropfen in Brennkraftmaschinen - Google Patents
Vorrichtung zur Regelung des Zerstäubungsgrades von Brennstofftropfen in Brennkraftmaschinen Download PDFInfo
- Publication number
- EP1132610A1 EP1132610A1 EP00200817A EP00200817A EP1132610A1 EP 1132610 A1 EP1132610 A1 EP 1132610A1 EP 00200817 A EP00200817 A EP 00200817A EP 00200817 A EP00200817 A EP 00200817A EP 1132610 A1 EP1132610 A1 EP 1132610A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- regulating
- atomization
- degree
- internal combustion
- combustion engines
- 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- Withdrawn
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Classifications
-
- 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
- F02M27/00—Apparatus for treating combustion-air, fuel, or fuel-air mixture, by catalysts, electric means, magnetism, rays, sound waves, or the like
- F02M27/08—Apparatus for treating combustion-air, fuel, or fuel-air mixture, by catalysts, electric means, magnetism, rays, sound waves, or the like by sonic or ultrasonic waves
Definitions
- This invention aims to improve the degree of atomization in an internal combustion engine, with particular reference to diesel engines.
- the system for fuel atomization in a diesel engine whether in the case of direct injection (DI) or in the case of indirect injection (IDI), currently requires a particularly high injection pressure (of the order of some hundreds of bars).
- DI direct injection
- IDI indirect injection
- This aspect is particularly critical in the case of direct injection, when the air turbulence at low engine r.p.m. becomes insufficient. Likewise, at the highest engine r.p.m., correct air-fuel mixing would require low atomization as the turbulence generated by the piston movement is particularly high.
- This invention provides a device for regulating the degree of atomization of the injected fuel based on the effect of one or more piezoelectric crystals powered by a high frequency voltage generator.
- the invention enables a low injection pressure to be used because the atomization is no longer provided by the injection process alone.
- the electrical pulse applied to the crystal causes that surface of the crystal exposed to the combustion chamber to vibrate at a frequency which depends on the electrical characteristics of the pulse.
- the high frequency vibration is transmitted into the medium in the form of the fuel-air mixture as pressure wave trains which propagate at the speed of sound.
- the destabilizing action can also be effective with different orders of magnitude, the greatest effectiveness is obtained when the wavelength resonates the droplet to be disintegrated in one of its vibration modes.
- the degree of atomization can be regulated by varying the frequency and amplitude of the emission.
- the device can also be applied in controlled ignition engines to achieve a more homogeneous air-fuel mixture.
- controlled ignition engines In these engines it can also be mounted on the manifold. It can be particularly convenient in single-point injection systems.
- Figure 1 shows a direct-injection diesel engine in which the piezoelectric crystal 1 is housed in a cartridge 2.
- the cartridge 2 is housed in the cylinder head 3 with the piezoelectric crystal 1 facing the combustion chamber 4.
- certain components which are important but not significant for the description of the invention (valves, piping, connecting rod etc.) have been omitted from the figure for ease of understanding.
- TDC top dead centre
- the jets 7 leaving the discharge orifices of the atomizer are struck by the wave train 8 produced by the crystal.
- the action of the ultrasonic waves is effective from the start of injection and until the combustion process is complete.
- Figure 2 shows an indirect injection engine, in which the cartridge 2 with the piezoelectric crystal 1 is housed in the prechamber 40 into which the fuel is injected. Again in this figure certain components which are important but not significant for the description of the invention (including the preheating plug) have been omitted from the figure for ease of understanding.
- Figure 3 schematically illustrates the disintegration of the droplet by the effect of passage of the pressure wave W through a generic fuel droplet 9.
- the ultrasonic wave by yielding energy, destabilizes it and causes it to split into two or more parts.
- the stages in this destabilization are indicate in the same figure by I, II, III.
- the diagram of Figure 4 shows the basic electrical components, namely the piezoelectric crystal 1 and the high frequency voltage generator 10.
- FIG. 5 is a diagram showing how regulation is achieved by a control unit 11 which acts on the main circuit by ON-OFF control and acts on the amplitude and frequency adjustment circuit of the generator 10.
- the control unit 11 receives input signals from appropriate transducers 12 which measure engine operating parameters such as r.p.m., load, engine coolant temperature and booster pressure, and from others transducers 13 which communicate process control signals (such as camshaft angular position and/or injection line pressure and/or injector needle rise).
- appropriate transducers 12 which measure engine operating parameters such as r.p.m., load, engine coolant temperature and booster pressure
- process control signals such as camshaft angular position and/or injection line pressure and/or injector needle rise.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00200817A EP1132610A1 (de) | 2000-03-08 | 2000-03-08 | Vorrichtung zur Regelung des Zerstäubungsgrades von Brennstofftropfen in Brennkraftmaschinen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00200817A EP1132610A1 (de) | 2000-03-08 | 2000-03-08 | Vorrichtung zur Regelung des Zerstäubungsgrades von Brennstofftropfen in Brennkraftmaschinen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1132610A1 true EP1132610A1 (de) | 2001-09-12 |
Family
ID=8171164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00200817A Withdrawn EP1132610A1 (de) | 2000-03-08 | 2000-03-08 | Vorrichtung zur Regelung des Zerstäubungsgrades von Brennstofftropfen in Brennkraftmaschinen |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1132610A1 (de) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2414494A (en) * | 1942-09-23 | 1947-01-21 | Vang Alfred | Method and apparatus for carburation |
US2453595A (en) * | 1943-08-27 | 1948-11-09 | Scophony Corp Of America | Apparatus for dispensing liquid fuel |
FR2268168A1 (de) * | 1974-04-22 | 1975-11-14 | Auto Herold | |
DE2650415A1 (de) * | 1975-11-04 | 1977-05-12 | Toyoda Chuo Kenkyusho Kk | Kraftstoffeinspritz- und zufuhr-vorrichtung |
GB2077351A (en) * | 1980-06-06 | 1981-12-16 | Rockwell International Corp | Diesel engine with ultrasonic atomization of fuel injected |
EP0121737A2 (de) * | 1983-03-07 | 1984-10-17 | Hitachi, Ltd. | Kraftstoffzufuhrapparat |
WO1999014469A1 (en) * | 1997-09-12 | 1999-03-25 | Michigan State University | Method and apparatus for active control of the combustion processes in an internal combustion engine |
-
2000
- 2000-03-08 EP EP00200817A patent/EP1132610A1/de not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2414494A (en) * | 1942-09-23 | 1947-01-21 | Vang Alfred | Method and apparatus for carburation |
US2453595A (en) * | 1943-08-27 | 1948-11-09 | Scophony Corp Of America | Apparatus for dispensing liquid fuel |
FR2268168A1 (de) * | 1974-04-22 | 1975-11-14 | Auto Herold | |
DE2650415A1 (de) * | 1975-11-04 | 1977-05-12 | Toyoda Chuo Kenkyusho Kk | Kraftstoffeinspritz- und zufuhr-vorrichtung |
GB2077351A (en) * | 1980-06-06 | 1981-12-16 | Rockwell International Corp | Diesel engine with ultrasonic atomization of fuel injected |
EP0121737A2 (de) * | 1983-03-07 | 1984-10-17 | Hitachi, Ltd. | Kraftstoffzufuhrapparat |
WO1999014469A1 (en) * | 1997-09-12 | 1999-03-25 | Michigan State University | Method and apparatus for active control of the combustion processes in an internal combustion engine |
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