EP3076003A2 - Injecteur de carburant et système d'injection de carburant - Google Patents

Injecteur de carburant et système d'injection de carburant Download PDF

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Publication number
EP3076003A2
EP3076003A2 EP16158652.4A EP16158652A EP3076003A2 EP 3076003 A2 EP3076003 A2 EP 3076003A2 EP 16158652 A EP16158652 A EP 16158652A EP 3076003 A2 EP3076003 A2 EP 3076003A2
Authority
EP
European Patent Office
Prior art keywords
fuel
injector
injection system
recess
pressure sensor
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Withdrawn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
EP16158652.4A
Other languages
German (de)
English (en)
Other versions
EP3076003A3 (fr
Inventor
Jeemon Plaparambil Kurian
Girish Muraleedharakurup
Kulkarni Sunilkumar Laxmanrao
Santhosh Kumar Geakaravally Rangegowda
Vamsi Mohan Chintalapati
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 Ltd
Original Assignee
Robert Bosch GmbH
Bosch Ltd
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 Robert Bosch GmbH, Bosch Ltd filed Critical Robert Bosch GmbH
Publication of EP3076003A2 publication Critical patent/EP3076003A2/fr
Publication of EP3076003A3 publication Critical patent/EP3076003A3/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Withdrawn legal-status Critical Current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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44

Definitions

  • This disclosure relates to a fuel injector and a fuel injection system
  • a published US patent application US20120031376 discloses a fuel injection system.
  • the fuel injection system comprises a high pressure pump and at least two injectors.
  • the fuel injector has a high-pressure area, which in operation for at least some of the time contains fuel under high injection pressure.
  • the fuel injector according also has a low-pressure area, which in operation contains no fuel and/or is connected to an outlet, so that a high fuel pressure does not build up in the low-pressure area and a lower pressure prevails than in the high-pressure area.
  • a pressure sensor is located in the low-pressure area and a transmission means is arranged so that for at least some of the time it exerts a force, which corresponds to the pressure of the fuel in the high-pressure area, on the sensor.
  • the force exerted on the sensor by the transmission means is proportional to the pressure in the high-pressure area. Since the pressure sensor is located in the low-pressure area of the fuel injector, the sensor does not need to have a special high pressure seal.
  • FIG. 1 illustrates a fuel injector 10 in accordance with this disclosure.
  • the fuel injector 10 comprises an injector body 12.
  • the injector body 12 comprises an inlet port 14 adapted to allow fuel to enter the injector body 12.
  • a fuel flow path 16 is defined within the injector body 12, which is adapted to allow fuel to flow from the inlet port 14 to an injector needle of the fuel injector 10.
  • the fuel injector 10 comprises a recess 18 provided in the injector body 12.
  • the fuel injector 10 is characterized so as to comprise a pressure sensor 20 located in the recess 18 in a manner such that a chamber 22 is formed in the recess 18 between an end wall 24 of the recess 18 and the pressure sensor 20 and a flow path 26 extends from the fuel flow path 16 to the recess 18 such that fuel from the fuel flow path 16 flows into the chamber 22.
  • FIG. 2 illustrates a fuel injection system 30 in accordance with this disclosure.
  • a fuel injection system 30 comprises a high pressure fuel pump 32 and at least 'n' fuel injectors, 'n' being the number of injector in said fuel injection system.
  • a first fuel injector 34 of the at least 'n' fuel injectors in fluid communication with an outlet 36 of the high pressure fuel pump 32 and the second to n th fuel injector adapted to receive fuel the (n -1) th fuel injector.
  • the fuel injection system 30 is characterized such that a pressure sensor 20 is located in the n th fuel injector 10 in a manner such that the pressure sensor 20 is adapted to measure pressure of fuel throughout the fuel injection system 30.
  • the n th fuel injector 10 comprises a recess 18 and the pressure sensor 20 located in the recess 18 in a manner such that a chamber 22 is formed in the recess 18 between an end wall 24 of the recess 18 and the pressure sensor 20.
  • the n th fuel injector 10 comprises a flow path 26 extending from fuel flow path 16 of the n th fuel injector 10 to the recess 18 such that fuel from the fuel flow path 16 flows into the chamber 22.
  • the first injector 34 comprises an inlet 42 and an outlet 38, wherein the inlet 42 is in fluid communication with outlet 36 of the high pressure fuel pump 12 and the outlet 38 is in fluid communication with inlet 40 of the n th fuel injector 10.
  • the said pressure sensor 20 is located in the recess 18 of the n th fuel injector 10 in a manner such that time taken to measure pressure by the pressure sensor 20 is lesser than the time between injection events in 'n' injectors.
  • the fuel injection system 30 comprises a high pressure fuel pump 32 and at least two fuel injectors.
  • a first fuel injector 34 of the at least two fuel injectors are in fluid communication with outlet 36 the high pressure fuel pump 32.
  • the outlet 38 of the first fuel injector 34 is connected to the inlet 40 of a second fuel injector 10 of the at least two fuel injectors.
  • the fuel injection system 30 is characterized such that a pressure sensor 20 located in the second fuel injector 10 in a manner such that the pressure sensor 20 is adapted to measure pressure of fuel throughout the fuel injection system 30.
  • the high pressure fuel pump 32 receives fuel from a fuel tank through a low pressure circuit comprising a feed pump and a filter.
  • a person skilled in the art will already be aware of the components involved in low pressure circuit of a fuel injection system.
  • the high pressure pump 32 has an outlet 36 which is connected to one of the at least two fuel injectors.
  • the outlet 36 of the high pressure pump 30 is in fluid communication with the inlet 42 of the first fuel injector 34.
  • the fuel from the inlet 42 flows into the fuel flow path inside the first injector 34 and at least a part of the fuel flows out of the outlet 38 of the first fuel injector to the second fuel injector 10.
  • the outlet 38 of the first injector 34 is in fluid communication with the inlet 40 of the second fuel injector 10.
  • the second injector 10 comprises a recess 18 and the pressure sensor 20 is located in the recess 18 in a manner such that a chamber 22 is formed in the recess 18 between an end wall 24 of the recess 18 and the pressure sensor 20.
  • the second injector 10 comprises a flow path 26 extending from the fuel flow path 16 of the second injector 10 to the recess 18 such that fuel from the fuel flow path 16 flows into the chamber 22.
  • the first injector 34 comprises an inlet 42 and an outlet 38.
  • the inlet 42 is in fluid communication with outlet 36 of the high pressure fuel pump 32 and the outlet 38 is in fluid communication with inlet 40 of the second injector 10.
  • the pressure sensor 20 is located in the recess 18 of the second injector 10 in a manner such that time take to measure pressure by the pressure sensor 20 is lesser than the time between injection events of the at least two injectors.
  • the pressure sensor 20 is located in the recess 18 using internal threads in the recess 18 and mating threads provided on the pressure sensor 20. Upon tightening, the threaded joint between threads on the recess 18 and the pressure sensor 20 produces axial force needed for sealing the high pressure interface between second injector 10 and pressure sensor 20.
  • the pressure sensor 20 is fitted on the second injector 10 along an axis, which is perpendicular or inclined to the injector main axis to suit engine/vehicle packaging.
  • An electrical interface of the pressure sensor 20 is used for transmitting the pressure signal to an electronic control unit. The drive current for the injector actuation is received through the electrical interface.
  • the fuel which is, pressurized in the high pressure pump 32 flows from the outlet 36 towards the inlet 42 of the first injector 34.
  • the fuel from the inlet 42 flows into the fuel flow path inside the first injector 34 and at least a part of the fuel flows out of the outlet 38 of the first fuel injector to the second fuel injector 10.
  • the fuel enters the second injector 10
  • the fuel flows through the fuel flow path 16.
  • a part of the fuel flows from the fuel flow path 16 to the flow path 26 and enters the chamber 22.
  • the chamber 22 is formed between the end wall 24 of the recess 18 and the pressure sensor 20 located in the recess 18.
  • the fuel injection system 30 is such that only one of the two injectors viz., the second injector 10 has the pressure sensor 20, which is fitted onto the injector. During the working of the fuel injection system 30 one single pressure sensor 20 provided in the second fuel injector 10 which is able to provide fuel pressure information of the entire fuel injection system 30.
  • the pressure build up in the fuel injection system is sensed by the pressure sensor 20 provided in the second injector.
  • an injection event say in a first injector 34 there may be a reduction in the fuel pressure in the overall fuel injection system.
  • the components of the fuel injection system 10 are designed in such a way that the time taken to measure the fuel pressure between two successive injection events is lower that time between two successive injection events.
  • the pressure sensor 20 is adapted to measure pressure of fuel throughout the fuel injection system and further control the fuel supplied to the high pressure pump 32 of the fuel injection system 30.
  • the measurement of the fuel pressure using the single pressure sensor 20 further allows overall fuel injection system 30 pressure control as fuel pressure information can be used to meter the fuel in the fuel injection system 30.
  • a fuel injector according to the invention having an integral pressure sensor, it is possible to dispense with a central pressure accumulator, in which the pressure sensor is fitted.
  • the fuel injection system 30 as disclosed can be designed with few components and is therefore inexpensive. Since the pressure sensor is located in the fuel injector itself, the pressure can easily be measured, even in systems that do not have a central pressure accumulator. It is therefore possible to use simple and inexpensive sensors. Further, since only one pressure sensor is used for the entire fuel injection system the system further.

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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)
EP16158652.4A 2015-04-02 2016-03-04 Injecteur de carburant et système d'injection de carburant Withdrawn EP3076003A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IN1766CH2015 2015-04-02

Publications (2)

Publication Number Publication Date
EP3076003A2 true EP3076003A2 (fr) 2016-10-05
EP3076003A3 EP3076003A3 (fr) 2017-03-01

Family

ID=55456688

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16158652.4A Withdrawn EP3076003A3 (fr) 2015-04-02 2016-03-04 Injecteur de carburant et système d'injection de carburant

Country Status (2)

Country Link
EP (1) EP3076003A3 (fr)
CN (1) CN106050502A (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120031376A1 (en) 2009-05-07 2012-02-09 Robert Bosch Gmbh Fuel injector having pressure sensor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT304102B (de) * 1970-10-07 1972-12-27 List Hans Einrichtung zur Messung des Druckes in Einspritzleitungen
EP1612405B1 (fr) * 2004-06-30 2008-11-05 C.R.F. Società Consortile per Azioni Système d'injection de carburant pour moteur à combustion interne
DE102005012928A1 (de) * 2005-03-21 2006-09-28 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine mehrzylindrige Brennkraftmaschine
JP2008064732A (ja) * 2006-08-11 2008-03-21 Denso Corp 圧力センサおよび圧力センサの取付構造ならび圧力センサの製造方法
DE102009055129A1 (de) * 2009-12-22 2011-06-30 Robert Bosch GmbH, 70469 Brennstoffeinspritzeinrichtung
JP5257441B2 (ja) * 2010-12-08 2013-08-07 株式会社デンソー 電気接続構造
GB201317451D0 (en) * 2013-10-02 2013-11-13 Delphi Tech Holding Sarl Fuel Injection Equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120031376A1 (en) 2009-05-07 2012-02-09 Robert Bosch Gmbh Fuel injector having pressure sensor

Also Published As

Publication number Publication date
EP3076003A3 (fr) 2017-03-01
CN106050502A (zh) 2016-10-26

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