WO2017029028A1 - A housing for a fuel control unit of a high pressure pump - Google Patents

A housing for a fuel control unit of a high pressure pump Download PDF

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Publication number
WO2017029028A1
WO2017029028A1 PCT/EP2016/066262 EP2016066262W WO2017029028A1 WO 2017029028 A1 WO2017029028 A1 WO 2017029028A1 EP 2016066262 W EP2016066262 W EP 2016066262W WO 2017029028 A1 WO2017029028 A1 WO 2017029028A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
connector
fuel
fcu
control unit
Prior art date
Application number
PCT/EP2016/066262
Other languages
French (fr)
Inventor
Shilpa Mani
Parthiban VIJAYAN
Antonio Diaferia
Krishnamurthy RAGHAVENDRA
Original Assignee
Robert Bosch Gmbh
Bosch Limited
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 Limited filed Critical Robert Bosch Gmbh
Publication of WO2017029028A1 publication Critical patent/WO2017029028A1/en

Links

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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/445—Selection of particular materials
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief valves
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials

Definitions

  • This invention relates to the field of a fuel control unit of a high pressure pump. Background of the invention
  • a fuel control unit regulates a metered quantity of fuel into a high pressure pump.
  • the FCU used in the state of art is an aluminium (Al) based casting.
  • Al aluminium
  • One of the drawbacks in Al based casting is porosity. Porosity in castings occurs when Al solidifies. Porosity in casting leads formation of blow holes in the casting and imperfections which may lead to leakage of fuel passing through the FCU.
  • the FCU used in state of art are made in a way such that, the connectors that are used for flow of fuel within and out of the FCU are made separate from the FCU.
  • the connectors have to be assembled on to the FCU using threads provided on the connector or through any other fastening and/ or connecting means.
  • the threads may weaken the joint between the connectors and the FCU leading to leakage of fuel.
  • FIG. 1 illustrates a housing for a fuel control unit in the state of art
  • FIG. 2 illustrates a housing for a fuel control unit.
  • FIG. 1 illustrates a housing (100) for a fuel control unit in the state of art.
  • a fuel control unit (FCU) is used to regulate flow of fuel in the housing of a high pressure pump.
  • Fuel passing through the fuel control unit reaches (a) at least one high pressure pump through a network of bores from the FCU to the inlet of the high pressure pump , (b) an overflow valve (104) for venting out fuel when pressure at inlet exceeds a specified limit through a backflow connector.
  • the fuel reaches the FCU from a fuel tank, through at least one connector (102).
  • the flow of fuel through the FCU is controlled with the help of metering unit (106) that may be present in the fuel control unit.
  • the FCU may have multiple outlet connectors.
  • the outlet connectors (108 and 110) serve to direct fuel out of the FCU.
  • the housing of the FCU is made of metal. Also, the connectors that serve as an inlet and outlet medium for fuel from the FCU are made separate from the FCU.
  • FIG. 2 illustrates a housing 200 for a fuel control unit of a high pressure pump.
  • the housing 200 comprises a first connector 202 in flow communication with an overflow valve 204 located within the housing 200.
  • the overflow valve 204 opens into a second connector 206, and a third connector 208 in flow communication with the first connector 202 via a metering unit 210 located in the housing 200.
  • An insert 212 enables positional location of the overflow valve 204 in the housing 200.
  • the second connector 206 is in flow communication with a fuel tank.
  • the housing 200 is made from plastic, and the first connector 202, the second connector 206 and the third connector 208 are integrated with the housing 200.
  • the plastic used may be a thermoplastic or a thermosetting plastic.
  • a sub-category of plastic under thermoplastic or thermosetting plastic may also be used as the material for housing 200 of the FCU.
  • plastic By using plastic as a material for the FCU, a reduction is weight and cost of the FCU is achieved
  • fuel reaches the first connector 202 from the low pressure pipe.
  • the low pressure pipe may have a fuel filter. From the first connector 202, the fuel can move through at least one flow path. The flow path that the fuel needs to take is decided by the metering unit 210.
  • the metering unit receives signals from an electronic control unit, based upon the signals received the fuel is either sent to the second connector 206 via the overflow valve 204.
  • the fuel may also flow via the third connector to reach the high pressure pump.
  • the first connector 202, the second connector 206, and the third connector 208 are made integrated with the housing 200. This prevents leakage of fuel entering and leaving the FCU.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

Disclosed herein is a housing (200) for a fuel control unit of a high pressure pump. The housing (200) comprises a first connector (202) in flow communication with an overflow valve (204) located within the housing (200). The overflow valve (204) opens into a second connector (206), and a third connector (208) in flow communication with the first connector (202) via a metering unit (210) located in the housing (200). The housing (200) is made from plastic and the first connector (202), the second connector (206) and the third connector (208) are integrated with the housing (200).

Description

Description
TITLE
A housing for a fuel control unit of a high pressure pump Field of the invention
This invention relates to the field of a fuel control unit of a high pressure pump. Background of the invention
A fuel control unit (FCU) regulates a metered quantity of fuel into a high pressure pump. The FCU used in the state of art is an aluminium (Al) based casting. One of the drawbacks in Al based casting is porosity. Porosity in castings occurs when Al solidifies. Porosity in casting leads formation of blow holes in the casting and imperfections which may lead to leakage of fuel passing through the FCU. Hence, there is need for a FCU that is leak proof. Also, the FCU used in state of art are made in a way such that, the connectors that are used for flow of fuel within and out of the FCU are made separate from the FCU. In other words the connectors have to be assembled on to the FCU using threads provided on the connector or through any other fastening and/ or connecting means. During the life of the FCU, the threads may weaken the joint between the connectors and the FCU leading to leakage of fuel. Hence, there is also a need for an FCU, in which leakage of fuel that occurs when connectors are assembled on to the FCU as available in the state of art, is prevented. Brief description of the accompanying drawing
Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing: FIG. 1 illustrates a housing for a fuel control unit in the state of art; and FIG. 2 illustrates a housing for a fuel control unit. Detailed description of the embodiments
FIG. 1 illustrates a housing (100) for a fuel control unit in the state of art. A fuel control unit (FCU) is used to regulate flow of fuel in the housing of a high pressure pump. Fuel passing through the fuel control unit reaches (a) at least one high pressure pump through a network of bores from the FCU to the inlet of the high pressure pump , (b) an overflow valve (104) for venting out fuel when pressure at inlet exceeds a specified limit through a backflow connector. The fuel reaches the FCU from a fuel tank, through at least one connector (102). The flow of fuel through the FCU is controlled with the help of metering unit (106) that may be present in the fuel control unit. The FCU may have multiple outlet connectors. The outlet connectors (108 and 110) serve to direct fuel out of the FCU. In the existing state of art, the housing of the FCU is made of metal. Also, the connectors that serve as an inlet and outlet medium for fuel from the FCU are made separate from the FCU.
FIG. 2 illustrates a housing 200 for a fuel control unit of a high pressure pump. The housing 200 comprises a first connector 202 in flow communication with an overflow valve 204 located within the housing 200. The overflow valve 204 opens into a second connector 206, and a third connector 208 in flow communication with the first connector 202 via a metering unit 210 located in the housing 200. An insert 212 enables positional location of the overflow valve 204 in the housing 200. The second connector 206 is in flow communication with a fuel tank. The housing 200 is made from plastic, and the first connector 202, the second connector 206 and the third connector 208 are integrated with the housing 200. The plastic used may be a thermoplastic or a thermosetting plastic. Alternately, a sub-category of plastic under thermoplastic or thermosetting plastic may also be used as the material for housing 200 of the FCU. By using plastic as a material for the FCU, a reduction is weight and cost of the FCU is achieved During working of the high pressure pump, fuel reaches the first connector 202 from the low pressure pipe. The low pressure pipe may have a fuel filter. From the first connector 202, the fuel can move through at least one flow path. The flow path that the fuel needs to take is decided by the metering unit 210. The metering unit receives signals from an electronic control unit, based upon the signals received the fuel is either sent to the second connector 206 via the overflow valve 204. The fuel may also flow via the third connector to reach the high pressure pump. The first connector 202, the second connector 206, and the third connector 208 are made integrated with the housing 200. This prevents leakage of fuel entering and leaving the FCU.
It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention in terms of the type or variety of plastic used. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.

Claims

We Claim:
1. A housing (200) for a fuel control unit of a high pressure pump, said housing comprising a first connector (202) in flow communication with an overflow valve (204) located within said housing (200), said overflow valve (204) opens into a second connector 206; and a third connector 208 in flow communication with said first connector via a metering unit 210 located in said housing 200, characterized in that said housing 200 is made from plastic and said first connector 202, said second connector 206 and said third connector 208 are integrated with said housing 200.
2. The housing 200 of claim 1, wherein an insert (212) enables positional location of said overflow valve (204) in said housing 200.
3. The housing 200 of claim 1, wherein said second connector 206 is in flow
communication with a fuel tank.
PCT/EP2016/066262 2015-08-17 2016-07-08 A housing for a fuel control unit of a high pressure pump WO2017029028A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN4297CH2015 2015-08-17
IN4297/CHE/2015 2015-08-17

Publications (1)

Publication Number Publication Date
WO2017029028A1 true WO2017029028A1 (en) 2017-02-23

Family

ID=56418506

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/066262 WO2017029028A1 (en) 2015-08-17 2016-07-08 A housing for a fuel control unit of a high pressure pump

Country Status (1)

Country Link
WO (1) WO2017029028A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136061A (en) * 1983-03-05 1984-09-12 Bosch Gmbh Robert Fuel injection systems for internal combustion engines
DE102007057503A1 (en) * 2007-11-29 2009-06-04 Robert Bosch Gmbh Radial piston pump for providing high pressure fuel supply in common rail injection system of internal-combustion engine, has low pressure channel provided in distributor element, where channel hydraulically connects pump element with inlet
DE102008043500A1 (en) * 2008-11-05 2010-07-01 Robert Bosch Gmbh Connection for housing of high-pressure unit for high pressure-fuel generation in injection system of internal combustion engine, comprises annular flange, which is provided in area of joint of high pressure unit
US20120152208A1 (en) * 2009-08-13 2012-06-21 Tobias Landenberger Fuel metering device for a fuel injection system
US20150059320A1 (en) * 2012-04-03 2015-03-05 Robert Bosch Gmbh Cooling device for connection piece

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136061A (en) * 1983-03-05 1984-09-12 Bosch Gmbh Robert Fuel injection systems for internal combustion engines
DE102007057503A1 (en) * 2007-11-29 2009-06-04 Robert Bosch Gmbh Radial piston pump for providing high pressure fuel supply in common rail injection system of internal-combustion engine, has low pressure channel provided in distributor element, where channel hydraulically connects pump element with inlet
DE102008043500A1 (en) * 2008-11-05 2010-07-01 Robert Bosch Gmbh Connection for housing of high-pressure unit for high pressure-fuel generation in injection system of internal combustion engine, comprises annular flange, which is provided in area of joint of high pressure unit
US20120152208A1 (en) * 2009-08-13 2012-06-21 Tobias Landenberger Fuel metering device for a fuel injection system
US20150059320A1 (en) * 2012-04-03 2015-03-05 Robert Bosch Gmbh Cooling device for connection piece

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