EP1132610A1 - Vorrichtung zur Regelung des Zerstäubungsgrades von Brennstofftropfen in Brennkraftmaschinen - Google Patents

Vorrichtung zur Regelung des Zerstäubungsgrades von Brennstofftropfen in Brennkraftmaschinen Download PDF

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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Withdrawn
Application number
EP00200817A
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English (en)
French (fr)
Inventor
Gino c/o Lombardi S.R.L. Parenti
Umberto c/o Lombardi S.R.L. Verza
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lombardini SRL
Original Assignee
Lombardini SRL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lombardini SRL filed Critical Lombardini SRL
Priority to EP00200817A priority Critical patent/EP1132610A1/de
Publication of EP1132610A1 publication Critical patent/EP1132610A1/de
Withdrawn legal-status Critical Current

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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.

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  • 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)
EP00200817A 2000-03-08 2000-03-08 Vorrichtung zur Regelung des Zerstäubungsgrades von Brennstofftropfen in Brennkraftmaschinen Withdrawn EP1132610A1 (de)

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)

* Cited by examiner, † Cited by third party
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

Patent Citations (7)

* Cited by examiner, † Cited by third party
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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