EP0886064A1 - Procédé d'injection de combustible - Google Patents

Procédé d'injection de combustible Download PDF

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Publication number
EP0886064A1
EP0886064A1 EP98110221A EP98110221A EP0886064A1 EP 0886064 A1 EP0886064 A1 EP 0886064A1 EP 98110221 A EP98110221 A EP 98110221A EP 98110221 A EP98110221 A EP 98110221A EP 0886064 A1 EP0886064 A1 EP 0886064A1
Authority
EP
European Patent Office
Prior art keywords
fuel
piezo actuator
nozzle needle
hydraulic
injector
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Withdrawn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
EP98110221A
Other languages
German (de)
English (en)
Inventor
Gerhard Dr. Hettich
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.)
Aumovio Microelectronic GmbH
Original Assignee
Temic Telefunken Microelectronic GmbH
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 Temic Telefunken Microelectronic GmbH filed Critical Temic Telefunken Microelectronic GmbH
Publication of EP0886064A1 publication Critical patent/EP0886064A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F02M51/0607—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means the actuator being hollow, e.g. with needle passing through the hollow space
    • 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

Definitions

  • the invention relates to a method for injecting fuel into the combustion chamber the cylinder of an internal combustion engine using fuel injectors, wherein a fuel injector an injector housing, a nozzle needle and one Piezo actuator controllable via a control unit, the piezo actuator directly acts on the nozzle needle.
  • a fuel injector is in the document DE 195 19 192 C1 described.
  • piezo actuators enable a very compact structure Fuel injector, since piezo actuators have no other mechanical components require. In addition, piezo actuators are easy to control electrically high positioning frequencies and can provide high positioning forces.
  • Piezo actuators for controlling the nozzle needle of fuel injectors are described.
  • the fuel injection pressure required for the injection is determined by a separate fuel pump provided. From the fuel pump the fuel is fed to the injector housing via a high-pressure connection and reaches the injector of the fuel injector via fuel channels.
  • the Fuel channels are used to control the amount of fuel injected by the nozzle needle blocked.
  • the problem with the use of piezo actuators is the very small stroke of the Piezo actuator, which is approximately 0.1% of the length of the piezo actuator.
  • One for injection The typical stroke of the fuel of the nozzle needle of 200 ⁇ m is therefore one Piezo actuator of approx. 20 cm in length is necessary.
  • Such a fuel injector can due to its dimensions with difficulty on an internal combustion engine or be arranged in the engine compartment of a motor vehicle.
  • the invention has for its object an improved method for injection of fuel in the combustion chamber of the cylinders of an internal combustion engine using piezo actuators, where the length of the piezo actuator can be reduced.
  • the hydraulic Translation enclosing housing made of a non-conductive material is, which when using liquid metal as incompressible Liquid the metal is melted by direct current passage, so that on a radiator for melting the metal in the injector housing when Starting the internal combustion engine can be dispensed with.
  • the stroke of a piezo actuator which is increased by a hydraulic transmission, causes a shorter overall length of the fuel injector.
  • the opportunity to Use of a fuel injector with a piezo actuator in engine construction is considerably increased due to the smaller space requirement.
  • the figure shows a fuel injector for diesel injection for a cylinder of a diesel engine.
  • the injector housing has a fuel connection KA for a fuel pump, a heating connection HA for supplying power to the heater H, a connection for a fuel return KR and a control connection SA for supplying power to a piezo actuator PA by a control unit.
  • Piezo actuators expand in proportion to the voltage applied to them.
  • the piezo actuators are controlled with voltages of up to 1000 volts via the control unit.
  • the piezo actuator PA expands by about 50 ⁇ m.
  • the stroke of the nozzle needle DN required for fuel injection is 200 ⁇ m.
  • a hydraulic transmission is arranged above the piezo actuator PA.
  • the hydraulic transmission is sealed on the side facing the piezo actuator PA by a lower punch US. On the opposite side, the hydraulic transmission is sealed by an upper stamp OS.
  • the pull rod ZS is also attached to the upper punch OS.
  • the hydraulic ratio is narrowed between the upper punch OS and the lower punch US Laval nozzles, the ratio between the stroke of the upper punch OS and the stroke of the lower punch US being 4 to 1, which means that the stroke of the piezo actuator is 50 ⁇ m enlarged to the required 200 ⁇ m.
  • Wood's metal WM is used as the incompressible liquid between the two stamps OS, US of the hydraulic transmission. Wood's metal WM is melted by a heater H surrounding the hydraulic transmission when the cold Delsel engine is started. The process of melting Wood's WM metal corresponds to the preheating of the glow plugs of the diesel engine and can be coupled to it. During vehicle operation, the heat dissipated by the diesel engine is sufficient to keep Wood's WM, which melts at a temperature of approx. 70 ° C, in a liquid state.
  • the heater H is regulated by a temperature sensor which can be arranged in the heater connection HA to supply the heater H with power and which is designed, for example, as a bimetal switch.
  • the pull rod ZS attached to the upper punch OS is guided through the incompressible liquid, through the lower punch US and through the hollow-drilled piezo actuator PA to the nozzle needle DN and is connected to the nozzle needle DN.
  • the pull rod ZS is made of a fiber material that transfers the stroke of the upper punch OS to the nozzle needle DN without loss.
  • the restoring force of the nozzle needle DN takes place by means of a closing spring SF, which is supported on one side against the injector housing and on the other side acts on the nozzle needle DN.
  • the closing spring SF closes the nozzle openings D ⁇ with the nozzle needle DN in the de-energized state of the piezo actuator PA.
  • the fuel injection pressure required to operate the diesel engine of up to 1500 bar is provided by a fuel pump upstream of the fuel injector provided.
  • the fuel is supplied by the fuel pump Fuel connection KA and via fuel channels inside the fuel injector up to the nozzle needle DN.
  • the plezo actuator PA is activated by the control unit controlled with a voltage that changes over time. Which is proportional to the applied voltage expanding piezo actuator PA moves over the hydraulic Ratio and the pull rod ST the nozzle needle DN, causing the fuel proportional to the voltage specified by the control unit Nozzle openings D ⁇ of the fuel injector in the corresponding combustion chamber of the diesel engine is injected.
  • the optimal voltage curves for an ignition process are in the control unit in a map, for example, depending on speed, load and / or temperature saved.
  • the control device can specify voltage curves over time, during which the fuel is injected into the combustion chamber in a pulsating manner in many short bursts of different frequencies during an injection process.
  • the nozzle opening D ⁇ is opened and closed many times by the piezo actuator PA through the nozzle needle DN, as a result of which the amount of fuel injected is not continuous over time.
  • voltage curves can also be specified by the control unit, in which the fuel is injected into the combustion chamber during an injection process for a combustion process with a continuous course of the fuel quantity over time.
  • the nozzle opening D ⁇ is opened and closed exactly once by the piezo actuator PA through the nozzle needle DN, and the amount of fuel injected is changed by how far the nozzle needle DN is pulled back by the piezo actuator PA.
  • Wood's metal WM can be melted by direct current passage be, whereby a heater H in the injector housing can be dispensed with.
  • the fuel injectors of an internal combustion engine can optionally be used with a temperature control, with which the temperature of the Wood's metal is monitored in the hydraulic translations. At the If the melting temperature is undershot, the temperature control H heating switched on. If a limit temperature is exceeded, temperature control to avoid malfunctions caused by thermal Expansion of Wood's metal or fuel injector passive means (Blower) and / or active means (Peltier element) for cooling the fuel injectors switched on.
  • a temperature control with which the temperature of the Wood's metal is monitored in the hydraulic translations. At the If the melting temperature is undershot, the temperature control H heating switched on. If a limit temperature is exceeded, temperature control to avoid malfunctions caused by thermal Expansion of Wood's metal or fuel injector passive means (Blower) and / or active means (Peltier element) for cooling the fuel injectors switched on.
  • the structure of the fuel injectors is simplified.
  • the piezo actuator PA, the hydraulic transmission and the nozzle needle DN arranged in a row in the fuel injector, with the hollow drilling of the Piezo actuator PA can be dispensed with and the tightness of the pull rod ZS reduced to a minimum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Fuel-Injection Apparatus (AREA)
EP98110221A 1997-06-20 1998-06-04 Procédé d'injection de combustible Withdrawn EP0886064A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997126125 DE19726125C2 (de) 1997-06-20 1997-06-20 Verfahren zur Einspritzung von Kraftstoff
DE19726125 1997-06-20

Publications (1)

Publication Number Publication Date
EP0886064A1 true EP0886064A1 (fr) 1998-12-23

Family

ID=7833069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98110221A Withdrawn EP0886064A1 (fr) 1997-06-20 1998-06-04 Procédé d'injection de combustible

Country Status (2)

Country Link
EP (1) EP0886064A1 (fr)
DE (1) DE19726125C2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2178828C2 (ru) * 2000-03-27 2002-01-27 Открытое акционерное общество "Ярославский завод топливной аппаратуры" Электромагнитная форсунка для двигателя внутреннего сгорания
RU2201522C2 (ru) * 2000-09-25 2003-03-27 ООО НПК "Базальт" Форсунка с электрическим управлением для двигателя внутреннего сгорания
RU2215179C2 (ru) * 1999-12-16 2003-10-27 Открытое акционерное общество "Ярославский завод топливной аппаратуры" Электроуправляемая форсунка для двигателя внутреннего сгорания
RU2218475C2 (ru) * 2000-01-06 2003-12-10 Открытое акционерное общество "Ярославский завод топливной аппаратуры" Форсунка высокого давления для двигателей внутреннего сгорания
RU2293873C1 (ru) * 2005-06-23 2007-02-20 Московский государственный открытый университет (МГОУ) Клапан для дозирования топлива в двигатель внутреннего сгорания с силовым многослойным пьезокерамическим приводом затвора
EP3490017A1 (fr) * 2017-11-27 2019-05-29 Siemens Aktiengesellschaft Dispositif d'actionnement pourvu d'actionneur de corps fixe et d'unité hydraulique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635016A (en) * 1967-09-27 1972-01-18 Physics Int Co Electromechanical actuator having an active element of electroexpansive material
US4858439A (en) * 1987-03-03 1989-08-22 Toyota Jidosha Kabushiki Kaisha Device for varying a stroke
DE4406522C1 (de) * 1994-02-28 1995-07-13 Siemens Ag Elektrohydraulisches Antriebselement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519192C1 (de) * 1995-05-24 1996-06-05 Siemens Ag Einspritzventil
DE19519191C2 (de) * 1995-05-24 1997-04-10 Siemens Ag Einspritzventil
DE19534445C2 (de) * 1995-09-16 1998-07-30 Man Nutzfahrzeuge Ag Einspritzventil für Brennkraftmaschinen
DE19548526A1 (de) * 1995-12-22 1997-07-03 Daimler Benz Ag Einspritzventil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635016A (en) * 1967-09-27 1972-01-18 Physics Int Co Electromechanical actuator having an active element of electroexpansive material
US4858439A (en) * 1987-03-03 1989-08-22 Toyota Jidosha Kabushiki Kaisha Device for varying a stroke
DE4406522C1 (de) * 1994-02-28 1995-07-13 Siemens Ag Elektrohydraulisches Antriebselement

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2215179C2 (ru) * 1999-12-16 2003-10-27 Открытое акционерное общество "Ярославский завод топливной аппаратуры" Электроуправляемая форсунка для двигателя внутреннего сгорания
RU2218475C2 (ru) * 2000-01-06 2003-12-10 Открытое акционерное общество "Ярославский завод топливной аппаратуры" Форсунка высокого давления для двигателей внутреннего сгорания
RU2178828C2 (ru) * 2000-03-27 2002-01-27 Открытое акционерное общество "Ярославский завод топливной аппаратуры" Электромагнитная форсунка для двигателя внутреннего сгорания
RU2201522C2 (ru) * 2000-09-25 2003-03-27 ООО НПК "Базальт" Форсунка с электрическим управлением для двигателя внутреннего сгорания
RU2293873C1 (ru) * 2005-06-23 2007-02-20 Московский государственный открытый университет (МГОУ) Клапан для дозирования топлива в двигатель внутреннего сгорания с силовым многослойным пьезокерамическим приводом затвора
EP3490017A1 (fr) * 2017-11-27 2019-05-29 Siemens Aktiengesellschaft Dispositif d'actionnement pourvu d'actionneur de corps fixe et d'unité hydraulique
US12006956B2 (en) 2017-11-27 2024-06-11 Metismotion Gmbh Actuator device and stopping and unlocking method

Also Published As

Publication number Publication date
DE19726125C2 (de) 1999-04-15
DE19726125A1 (de) 1998-12-24

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