EP3377755B1 - A fuel injector with corrosion protection - Google Patents

A fuel injector with corrosion protection Download PDF

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Publication number
EP3377755B1
EP3377755B1 EP16794974.2A EP16794974A EP3377755B1 EP 3377755 B1 EP3377755 B1 EP 3377755B1 EP 16794974 A EP16794974 A EP 16794974A EP 3377755 B1 EP3377755 B1 EP 3377755B1
Authority
EP
European Patent Office
Prior art keywords
spray pipe
fuel injector
fuel
induction coil
opening
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.)
Active
Application number
EP16794974.2A
Other languages
German (de)
French (fr)
Other versions
EP3377755A1 (en
Inventor
Mete ALTIN
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.)
Robert Bosch GmbH
Bosch Sanayi ve Ticaret AS
Original Assignee
Robert Bosch GmbH
Bosch Sanayi ve Ticaret AS
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Publication date
Application filed by Robert Bosch GmbH, Bosch Sanayi ve Ticaret AS filed Critical Robert Bosch GmbH
Publication of EP3377755A1 publication Critical patent/EP3377755A1/en
Application granted granted Critical
Publication of EP3377755B1 publication Critical patent/EP3377755B1/en
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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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/005—Fuel-injectors combined or associated with other devices the devices being sensors
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/06—Injectors with heating, cooling, or thermally-insulating means with fuel-heating means, e.g. for vaporising
    • 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
    • F02M2200/248—Temperature sensors

Definitions

  • the present invention relates to fuel injectors used for spraying fuel into the combustion chamber in internal combustion engines.
  • Fuel injectors in general provide spraying fuel with desired intervals into the combustion chamber in internal combustion engines.
  • the fuel which passes in a controlled manner through the valve region defined inside fuel injectors, passes through the spray pipe extending inside the engine block, and it arrives at the spray tip opened to the combustion chamber provided in the engine, and it is sprayed into the combustion chamber.
  • the acidic gases formed as a result of the explosions which occur in the combustion chamber, enter between the spray pipe and the engine block, and they lead to corrosion outside of the spray pipe, in other words, they lead to corrosion in the fuel injector.
  • JP H05-288131 A , WO 2007/109219 A2 and WO 2011/091121 A1 disclose fuel injectors with coils to heat the fuel prior to injection.
  • JP 2010-265774 A discloses a heating device to warm up the fuel in the fuel rail.
  • the present invention relates to a fuel injector, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.
  • the main object of the present invention is to provide a fuel injector where corrosion between the spray pipe of the fuel injector and the engine block is prevented.
  • the present invention relates to a fuel injector having at least one spray pipe, in order to be used for providing spraying of fuel into the combustion chamber in a controlled manner in internal combustion engines. Accordingly, there is at least one induction coil connected to said spray pipe in order to increase the temperature in the vicinity of the spray pipe.
  • the induction coil at least partially surrounds the spray pipe.
  • At least one temperature sensor is connected to the spray pipe which measures the temperature of a critical region defined between the spray pipe and the wall of the opening.
  • the periphery of the spray pipe is heated by means of the induction coil. By means of this, condensation and corrosion formation at the periphery of the spray pipe is prevented.
  • control unit connected to the temperature sensor.
  • the induction coil is activated.
  • the control unit activates the induction coil.
  • the spray pipe is positioned in an opening provided on the engine block.
  • the subject matter fuel injector (10) comprises an injector body (20) wherein the valve elements (21) are positioned.
  • the tip of said spray pipe (22) is defined as a spray tip (23).
  • the fuel injector (10) In order to provide reaching of the fuel, exiting the fuel injector (10), at the combustion chamber (32) formed inside the engine block (30), the fuel injector (10) is fixed to at least one opening (31) provided on the engine block (30).
  • the spray pipe (22) of the fuel injector (10) is positioned inside said opening (31).
  • At least one temperature sensor (40) which measures the temperature of the critical region (50) defined between the spray pipe (22) and the wall of the opening (31) provided on the engine block (30). Said temperature sensor (40) transfers the measurement values to a control unit (60).
  • the fuel exiting the spray tip (23), reaches the combustion chamber (32).
  • the gases formed after the explosions occurring in the combustion chamber (32) try to enter into the critical region (50) defined between the engine block (30) and the spray pipe (22).
  • the control unit (60) can activate the induction coil (70) depending on the measured temperature value.
  • the control unit (60) checks the amount of load applied to the motor, and it can activate the induction coil (70) in case of low loads, and the heating process can be realized.

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  • 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)

Description

    TECHNICAL FIELD
  • The present invention relates to fuel injectors used for spraying fuel into the combustion chamber in internal combustion engines.
    • PRIOR ART
  • Fuel injectors in general provide spraying fuel with desired intervals into the combustion chamber in internal combustion engines.
  • The fuel, which passes in a controlled manner through the valve region defined inside fuel injectors, passes through the spray pipe extending inside the engine block, and it arrives at the spray tip opened to the combustion chamber provided in the engine, and it is sprayed into the combustion chamber. The acidic gases, formed as a result of the explosions which occur in the combustion chamber, enter between the spray pipe and the engine block, and they lead to corrosion outside of the spray pipe, in other words, they lead to corrosion in the fuel injector.
  • As a result, because of all of the abovementioned problems, an improvement is required in the related technical field.
  • JP H05-288131 A , WO 2007/109219 A2 and WO 2011/091121 A1 disclose fuel injectors with coils to heat the fuel prior to injection. In addition, JP 2010-265774 A discloses a heating device to warm up the fuel in the fuel rail.
    • BRIEF DESCRIPTION OF THE INVENTION
  • The present invention relates to a fuel injector, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.
  • The main object of the present invention is to provide a fuel injector where corrosion between the spray pipe of the fuel injector and the engine block is prevented.
  • In order to realize all of the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention relates to a fuel injector having at least one spray pipe, in order to be used for providing spraying of fuel into the combustion chamber in a controlled manner in internal combustion engines. Accordingly, there is at least one induction coil connected to said spray pipe in order to increase the temperature in the vicinity of the spray pipe. The induction coil at least partially surrounds the spray pipe. At least one temperature sensor is connected to the spray pipe which measures the temperature of a critical region defined between the spray pipe and the wall of the opening.
  • Thus, when desired, the periphery of the spray pipe is heated by means of the induction coil. By means of this, condensation and corrosion formation at the periphery of the spray pipe is prevented.
  • In a preferred embodiment of the subject matter invention, there is at least one control unit connected to the temperature sensor. Thus, when the temperature around the spray pipe decreases below a pre-calculated value, the induction coil is activated. In another embodiment, when the load applied to the motor is reduced, it is expected that the temperature will decrease, and the control unit activates the induction coil.
  • In a preferred embodiment of the subject matter invention, the spray pipe is positioned in an opening provided on the engine block.
    • BRIEF DESCRIPTION OF THE FIGURES
  • In Figure 1, a representative view of the subject matter fuel injector is given.
    • REFERENCE NUMBERS
    • 10 Fuel injector
    • 20 Injector body
    • 21 Valve element
      • 22 Spray pipe
      • 23 Spray tip
      • 24 Fuel channel
    • 30 Engine block
      • 31 Opening
      • 32 Combustion chamber
    • 40 Temperature sensor
    • 50 Critical region
    • 60 Control unit
    • 70 Induction coil
    THE DETAILED DESCRIPTION OF THE INVENTION
  • In this detailed description, the subject matter fuel injector (10) is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.
  • As can be seen in Figure 1, the subject matter fuel injector (10) comprises an injector body (20) wherein the valve elements (21) are positioned. There is at least one spray pipe (22) extending outwardly from said injector body (20). The tip of said spray pipe (22) is defined as a spray tip (23). There is at least one fuel channel (24) extending through the injector body (20) towards the spray tip (23). The fuel, which is transferred to the fuel channel (24) under the control of the valve elements (21) inside the injector body (20), advances along the spray pipe (22), and it passes through the spray tip (23), and it exits the fuel injector (10).
  • In order to provide reaching of the fuel, exiting the fuel injector (10), at the combustion chamber (32) formed inside the engine block (30), the fuel injector (10) is fixed to at least one opening (31) provided on the engine block (30). The spray pipe (22) of the fuel injector (10) is positioned inside said opening (31). There is an induction coil (70) which at least partially surrounds the periphery of the spray pipe (22). By means of said induction coil (70), the spray pipe (22) and the inner wall of the opening (31) can be heated when desired.
  • Moreover, there is at least one temperature sensor (40) which measures the temperature of the critical region (50) defined between the spray pipe (22) and the wall of the opening (31) provided on the engine block (30). Said temperature sensor (40) transfers the measurement values to a control unit (60).
  • In said embodiment, the fuel, exiting the spray tip (23), reaches the combustion chamber (32). The gases formed after the explosions occurring in the combustion chamber (32) try to enter into the critical region (50) defined between the engine block (30) and the spray pipe (22). The gases, which enter between the spray pipe (22) and the engine block (30), condense in cases where the engine operates under low load and cools, and said gases may lead to corrosion in the critical region (50). By means of the induction coil (70) provided in the vicinity of the spray pipe (22), the critical region (50) is heated, and condensation and thus corrosion are prevented. The control unit (60) can activate the induction coil (70) depending on the measured temperature value. In an alternative embodiment, the control unit (60) checks the amount of load applied to the motor, and it can activate the induction coil (70) in case of low loads, and the heating process can be realized.
  • By means of said embodiment, when the temperature between the inner wall of the opening (31) and the spray pipe (22) decreases under a predetermined critical value, the temperature is increased by means of the induction coil (70), the condensation formation in the critical region (50) is prevented. Thus, corrosion in the critical region (50) is also prevented.
  • The protection scope of the present invention is set forth in the annexed Claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.

Claims (3)

  1. A fuel injector (10) having at least one spray pipe (22), in order to be used for providing spraying of fuel into the combustion chamber (32) in a controlled manner in internal combustion engines, the tip of said spray pipe (22) is defined as a spray tip (23), the spray pipe (22) being positioned in an opening (31) of an engine block (30) when in use, characterized by comprising at least one induction coil (70) connected to said spray pipe (22) in order to increase the temperature in the vicinity of the spray pipe (22), wherein the induction coil (70) at least partially surrounds the spray pipe (22), so that the spray pipe (22) and the inner wall of the opening (31) can be heated by means of said induction coil (70), and comprising at least one temperature sensor (40) connected to the spray pipe (22) which measures the temperature of a critical region defined between the spray pipe (22) and the wall of the opening (31).
  2. A fuel injector (10) according to claim 1, characterized in by comprising at least one control unit (60) connected to the temperature sensor (40).
  3. An engine block (30) comprising a fuel injector according to one of the claims 1 or 2, characterized in that the spray pipe (22) is positioned in an opening (31) provided in the engine block (30).
EP16794974.2A 2015-11-16 2016-11-07 A fuel injector with corrosion protection Active EP3377755B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201514396 2015-11-16
PCT/EP2016/076782 WO2017084901A1 (en) 2015-11-16 2016-11-07 A fuel injector with corrosion protection

Publications (2)

Publication Number Publication Date
EP3377755A1 EP3377755A1 (en) 2018-09-26
EP3377755B1 true EP3377755B1 (en) 2021-05-26

Family

ID=57288381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16794974.2A Active EP3377755B1 (en) 2015-11-16 2016-11-07 A fuel injector with corrosion protection

Country Status (2)

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EP (1) EP3377755B1 (en)
WO (1) WO2017084901A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2559798B (en) * 2017-02-20 2020-03-11 Delphi Automotive Systems Lux Fuel injector
BR102020026406A2 (en) 2020-12-22 2022-07-05 Robert Bosch Limitada FUEL HEATING DEVICE

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010265774A (en) * 2009-05-12 2010-11-25 Nippon Soken Inc Starter and starting method for internal combustion engine
WO2011091121A1 (en) * 2010-01-22 2011-07-28 Continental Automotive Systems, Inc. Parametric temperature regulation of induction heated load

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3039120B2 (en) * 1992-04-02 2000-05-08 株式会社デンソー Fuel supply device for internal combustion engine
JPH10238424A (en) * 1997-02-21 1998-09-08 Denso Corp Fuel injector
US20050263136A1 (en) * 2002-09-11 2005-12-01 Rigney Shaun T Fuel delivery system
US7481376B2 (en) * 2006-03-17 2009-01-27 Continental Automotive Systems Us, Inc. Variable inductive heated injector
DE102011085680B4 (en) * 2011-11-03 2013-07-04 Continental Automotive Gmbh Heating coil for an injection valve and injection valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010265774A (en) * 2009-05-12 2010-11-25 Nippon Soken Inc Starter and starting method for internal combustion engine
WO2011091121A1 (en) * 2010-01-22 2011-07-28 Continental Automotive Systems, Inc. Parametric temperature regulation of induction heated load

Also Published As

Publication number Publication date
EP3377755A1 (en) 2018-09-26
WO2017084901A1 (en) 2017-05-26

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