EP3315762B1 - Integrated arrangement of a common rail and a pressure sensor - Google Patents
Integrated arrangement of a common rail and a pressure sensor Download PDFInfo
- Publication number
- EP3315762B1 EP3315762B1 EP17198107.9A EP17198107A EP3315762B1 EP 3315762 B1 EP3315762 B1 EP 3315762B1 EP 17198107 A EP17198107 A EP 17198107A EP 3315762 B1 EP3315762 B1 EP 3315762B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- common rail
- pressure sensor
- transverse wall
- arrangement
- recess
- 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
Links
- 239000000446 fuel Substances 0.000 claims description 31
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000002991 molded plastic Substances 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
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
- 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
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
- F02M63/0275—Arrangement of common rails
-
- 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
- F02M55/025—Common rails
-
- 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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/003—Measuring variation of fuel pressure in high pressure line
-
- 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
- F02M2200/247—Pressure 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8046—Fuel injection apparatus manufacture, repair or assembly the manufacture involving injection moulding, e.g. of plastic or metal
-
- 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
- F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
Definitions
- the present invention relates to fuel injection equipment and more particularly to an integrated assembly of a common rail and a pressure sensor.
- a direct injection fuel equipment comprises a pump which pressurises and delivers fuel to a common rail that stores and distributes it to a plurality of injectors.
- the common rail typically has an elongated body defining a cylindrical inner space and it is provided with an inlet and several outlets radially arranged in the peripheral wall of the body.
- a pressure sensor adapted to send to a command unit a signal dependent on the pressure internal to the rail and, at the opposite end is arranged an electro-valve that receives command signals from said command unit to alternatively open or close a spill orifice thus enabling to regulate the internal pressure.
- the inner space, wherein is stored said pressurised fuel, is a through hole opening in both ends of the rail and specific complex machining operations are required to manufacture the geometrical features enabling complementary arrangement of the pressure limiting valve and of the pressure sensor.
- the pressure sensor forms a protruding member larger than the rail and, specific space needs to be reserved for arranging the assembly on the engine block.
- JP2004108338A discloses a thin-walled end cap of a short common rail body, the end cap being brazed into the tube-shaped end of the common rail body. No pressure sensor is present at that end cap.
- DE102005053683A1 discloses a fuel injector with a pressure sensor being mounted outside the fuel injector in a recess where the wall of the fuel injector has been made thinner. Inside the thin wall, the high pressure fuel supply bore is placed so that the pressure sensor can measure the fuel pressure via the flexing of the thin wall.
- WO2016/000913A1 discloses a pressure limiting valve being mounted into a recess of an end of an elongated common rail body.
- the common rail adapted to be arranged in a fuel injection equipment of an internal combustion engine, said common rail having an elongated body extending along a longitudinal axis from a first end wherein is arranged the pressure sensor, to a second end, said body defining a substantially cylindrical peripheral wall surrounding a cylindrical internal space wherein in use, highly pressurised fuel is stored.
- the common rail further comprises a transverse wall arranged in the vicinity of said first end, said transverse wall sealingly closing said internal space so that, in use, pressurised fuel retained in the inner space exerts forces on an inner face of said transverse wall.
- the transverse wall is arranged slightly inside the first end of the common rail thus defining a recess opening in said first end, the recess being defined between the very end of the peripheral wall and an outer face of the transverse wall that forms the bottom of said recess.
- said transverse wall is integral to the peripheral wall, the pressure sensor having a force sensing device fixed on the outer face of the transverse wall and residing within the recess, said force sensing device being adapted to generate a signal representative of the pressure in the internal space; the assembly further comprising an electric connector arranged at the first end of the common rail, said connector having pins electrically connected to the force sensing device.
- transverse wall is provided with a thinning feature reducing locally the thickness of the wall.
- said force sensing device is a strain gauge.
- the invention further extends to an assembly of an arrangement of a common rail and a pressure sensor as described above with a pressure limiting valve.
- the invention extends to a fuel injection equipment comprising an arrangement of a common rail and a pressure sensor as described above.
- Figure 1 generally presents a fuel injection equipment 10 of an internal combustion engine.
- the equipment 10 comprises a pumping device that draws fuel from a tank, pressurises and delivers it to a common rail 12, wherefrom said pressurised fuel is distributed to fuel injectors, only one being shown, adapted to alternatively spray said fuel in the pistons of the engine.
- a pressure sensor 14 is arranged at a first end 16 of the common rail 12 and a pressure limiting valve 18 is arranged at an opposite distant end.
- a command unit 20 controls the overall operation of the equipment 10 and, in particular, it regulates the rail internal pressure by receiving from the pressure sensor 14 a signal representative of the fuel pressure inside the rail 12 and by sending to the pressure limiting valve 18 a signal to command opening or closing of a spill orifice enabling fuel in excess in the rail to return to the tank.
- the magnified view of figure 2 presents an arrangement 22 comprising the common rail 12 and the pressure sensor 14 arranged at the first end 16 of the rail; a connector 24 is also arranged protruding from said first end 16.
- the rail 12 has an elongated shape extending along a longitudinal axis X from said first end 16 to said opposite distant end.
- the rail 12 presented is machined from a forged blank and it comprises a radially extending inlet 26 for enabling connection to a high pressure pipe, several radially extending outlets 28 of which four are shown in the figure, four connecting pipes joining the injectors and two ear members 30 for fixing the rail on the engine block.
- This embodiment is shown as an illustration and many other embodiments are known with other numbers of outlets or other orientations of the inlet and outlets.
- the rail 12 has a cylindrical peripheral wall 32 surrounding an inner space S in which opens the inlet and outlets, not shown on said figures.
- the rail 12 is further provided with a transverse wall 34 arranged inside said peripheral wall 32 and sealingly closing the space S, said transverse wall 34 having an inner face 36 oriented toward the inner space S opposed to an outer face 38 oriented toward the opening of the first end.
- the transverse wall 34 being arranged slightly inside the rail 12, it defines along with the very end portion of the peripheral wall 32 a recess 40 that opens in said first end 16 of the rail.
- the transverse wall 34 can be integral to the peripheral wall or can be added afterward and sealingly fixed to it by screwing, welding, laser welding, friction welding or any other known means.
- the embodiment of figure 3 presents a transverse wall 34 having a constant thickness with planar inner 36 and outer 38 faces while, a transverse wall 34 having nonplanar inner and outer faces is possible.
- the transverse wall 34 could also be non-symmetric with, for instance a flat outer face 38 and a non-flat inner face 36.
- the inner face 36 of the transverse wall 34 is in contact with the fuel and is directly subject to the fuel pressure in the inner space S and, under said pressure which in the case of diesel fuel can reach up to 2500 bars and much more under testing conditions, the transverse wall 34 slightly deflects.
- a force sensing device 42 for instance a strain gauge intimately fixed on the outer face 38, follows and senses said resilient deformation of the transverse wall 34. Strain gauges are generally fixed on a larger ceramic wafer 43 which is intimately glued to the transverse wall.
- the central bore of the rail is about 10 mm diameter
- the transverse wall 34 has a thickness of about 1mm
- the strain gauge 42 being of about 1 mm 2
- the wafer 43 is about 5 mm in diameter.
- the electric connector 24 As shown in figure 4 the electric connector 24, previously introduced, has a small profile and is provided with electrical pins 44 adapted to complementary connect to another connector, not shown, linked to the command unit 20.
- small profile is to be understood as having the minimum necessary size enabling said complementary connection.
- the connector 24 may axially extend as shown in figure 2 or make an angle as in figure 4 where it is represented provided with a cylindrical engagement feature arranged around the end of the rail. Other connection types are possible such as an engagement inside the recess.
- said connector 24 is provided with electrical leads 46 linking said force sensing device 42 to the pins 44 so that the fuel pressure in the inner space S deforms the transverse wall 34, said deformation is sensed by the force sensing device 42 which can transmit to the command unit a signal indicative of the fuel pressure.
- the pressure sensor 14 that is in the prior art a separate component integrating in a body fixed to the rail, the wall, the sensing device, the leads and the connector, is now divided in individual components better integrated with the rail 12.
- the transverse wall 34 is much thicker than in figures 3 and 4 .
- the force sensing device 42 remains glued on the outer face 38 and, to enable proper sensing, a thinning recess 48 is arranged in the transverse wall 14. Said recess 48 axially extends in the wall 34 from the inner face 36 to a bottom face 50 so that, the remaining thickness between said bottom face 50 and the outer face 38 is about 1mm.
- the outer recess 40 opening at the first end 16 of the common rail is enlarged defining an annular groove 52 surrounding the central area of the wall 34 where is fixed the force sensing device 42.
- the transverse wall 34 is provided with a central through aperture 54 axially extending between the inner 36 and outer 38 faces.
- the force sensing device 42 fixed on its wafer 43 is glued to a metallic plug 56 of about 1mm thickness, said plug 56 being fixed on the outer face 38 over the opening of the aperture 54.
- the plug 56 can be welded, laser welded or any other fixation means can be used provided it resists to the pressure in the inner space S.
- the transverse wall 34 can be arranged closer to the very end of the rail 12, the resulting recess 40 being shallow or, said transverse wall 34 can even be arranged at the very end of the rail without defining a recess 40, the force sensing device 42 still being fixed to the outer face 38 of the transverse wall and, the connector 24 with an appropriate design would also be fixed to the rail and would provide the required protection to the sensing device.
- the volume inside the connector may be filled with moulding plastics that would provide further protection to the sensing device.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- The present invention relates to fuel injection equipment and more particularly to an integrated assembly of a common rail and a pressure sensor.
- A direct injection fuel equipment comprises a pump which pressurises and delivers fuel to a common rail that stores and distributes it to a plurality of injectors. The common rail typically has an elongated body defining a cylindrical inner space and it is provided with an inlet and several outlets radially arranged in the peripheral wall of the body. At an extremity of the rail is tightly screwed a pressure sensor adapted to send to a command unit a signal dependent on the pressure internal to the rail and, at the opposite end is arranged an electro-valve that receives command signals from said command unit to alternatively open or close a spill orifice thus enabling to regulate the internal pressure.
- The inner space, wherein is stored said pressurised fuel, is a through hole opening in both ends of the rail and specific complex machining operations are required to manufacture the geometrical features enabling complementary arrangement of the pressure limiting valve and of the pressure sensor.
- Furthermore, the pressure sensor forms a protruding member larger than the rail and, specific space needs to be reserved for arranging the assembly on the engine block.
-
JP2004108338A DE102005053683A1 discloses a fuel injector with a pressure sensor being mounted outside the fuel injector in a recess where the wall of the fuel injector has been made thinner. Inside the thin wall, the high pressure fuel supply bore is placed so that the pressure sensor can measure the fuel pressure via the flexing of the thin wall.WO2016/000913A1 discloses a pressure limiting valve being mounted into a recess of an end of an elongated common rail body. - Accordingly, it is an object of the present invention to resolve the above mentioned problems in providing an arrangement of a common rail and a pressure sensor, the common rail adapted to be arranged in a fuel injection equipment of an internal combustion engine, said common rail having an elongated body extending along a longitudinal axis from a first end wherein is arranged the pressure sensor, to a second end, said body defining a substantially cylindrical peripheral wall surrounding a cylindrical internal space wherein in use, highly pressurised fuel is stored.
- The common rail further comprises a transverse wall arranged in the vicinity of said first end, said transverse wall sealingly closing said internal space so that, in use, pressurised fuel retained in the inner space exerts forces on an inner face of said transverse wall.
- Also, the transverse wall is arranged slightly inside the first end of the common rail thus defining a recess opening in said first end, the recess being defined between the very end of the peripheral wall and an outer face of the transverse wall that forms the bottom of said recess.
- Also, said transverse wall is integral to the peripheral wall, the pressure sensor having a force sensing device fixed on the outer face of the transverse wall and residing within the recess, said force sensing device being adapted to generate a signal representative of the pressure in the internal space; the assembly further comprising an electric connector arranged at the first end of the common rail, said connector having pins electrically connected to the force sensing device.
- In a specific embodiment said transverse wall is provided with a thinning feature reducing locally the thickness of the wall.
- More particularly, said force sensing device is a strain gauge.
- Also, it is possible, once the force sensing device is fixed on said outer face of the transverse wall, to fill said recess with moulded plastics.
- The invention further extends to an assembly of an arrangement of a common rail and a pressure sensor as described above with a pressure limiting valve.
- Also, the invention extends to a fuel injection equipment comprising an arrangement of a common rail and a pressure sensor as described above.
- The present invention is now described by way of example with reference to the accompanying drawings in which:
-
Figure 1 is a schematic representation of a fuel injection equipment comprising a common rail and pressure sensor arrangement as per the invention. -
Figure 2 is a 3D view of the rail and sensor arrangement offigure 1 . -
Figure 3 is an axial section of a first embodiment of the rail and a force sensing device arrangement offigures 1 or2 . -
Figure 4 is the arrangement offigure 3 further provided with a connector arranged to electrically connect the force sensing device. -
Figure 5 is a second embodiment of a rail and sensor arrangement. -
Figure 6 is an alternative to the second embodiment offigure 5 . -
Figure 7 is a third embodiment of a rail and sensor arrangement. -
Figure 1 generally presents afuel injection equipment 10 of an internal combustion engine. Theequipment 10 comprises a pumping device that draws fuel from a tank, pressurises and delivers it to acommon rail 12, wherefrom said pressurised fuel is distributed to fuel injectors, only one being shown, adapted to alternatively spray said fuel in the pistons of the engine. Apressure sensor 14 is arranged at afirst end 16 of thecommon rail 12 and apressure limiting valve 18 is arranged at an opposite distant end. - A
command unit 20 controls the overall operation of theequipment 10 and, in particular, it regulates the rail internal pressure by receiving from the pressure sensor 14 a signal representative of the fuel pressure inside therail 12 and by sending to the pressure limiting valve 18 a signal to command opening or closing of a spill orifice enabling fuel in excess in the rail to return to the tank. - The magnified view of
figure 2 presents anarrangement 22 comprising thecommon rail 12 and thepressure sensor 14 arranged at thefirst end 16 of the rail; aconnector 24 is also arranged protruding from saidfirst end 16. - The
rail 12 has an elongated shape extending along a longitudinal axis X from saidfirst end 16 to said opposite distant end. Therail 12 presented is machined from a forged blank and it comprises a radially extendinginlet 26 for enabling connection to a high pressure pipe, several radially extendingoutlets 28 of which four are shown in the figure, four connecting pipes joining the injectors and twoear members 30 for fixing the rail on the engine block. This embodiment is shown as an illustration and many other embodiments are known with other numbers of outlets or other orientations of the inlet and outlets. - A more detailed integration of the arrangement of the
pressure sensor 14 into therail 12 is now presented in reference to thefigures 3 to 7 presenting axial sections of thefirst end 16 of the rail. Therail 12 has a cylindricalperipheral wall 32 surrounding an inner space S in which opens the inlet and outlets, not shown on said figures. In saidfirst end 16, therail 12 is further provided with atransverse wall 34 arranged inside saidperipheral wall 32 and sealingly closing the space S, saidtransverse wall 34 having aninner face 36 oriented toward the inner space S opposed to anouter face 38 oriented toward the opening of the first end. Also as shown, thetransverse wall 34 being arranged slightly inside therail 12, it defines along with the very end portion of the peripheral wall 32 arecess 40 that opens in saidfirst end 16 of the rail. Thetransverse wall 34 can be integral to the peripheral wall or can be added afterward and sealingly fixed to it by screwing, welding, laser welding, friction welding or any other known means. The embodiment offigure 3 presents atransverse wall 34 having a constant thickness with planar inner 36 and outer 38 faces while, atransverse wall 34 having nonplanar inner and outer faces is possible. Thetransverse wall 34 could also be non-symmetric with, for instance a flatouter face 38 and a non-flatinner face 36. - In use, the
inner face 36 of thetransverse wall 34 is in contact with the fuel and is directly subject to the fuel pressure in the inner space S and, under said pressure which in the case of diesel fuel can reach up to 2500 bars and much more under testing conditions, thetransverse wall 34 slightly deflects. Aforce sensing device 42, for instance a strain gauge intimately fixed on theouter face 38, follows and senses said resilient deformation of thetransverse wall 34. Strain gauges are generally fixed on a larger ceramic wafer 43 which is intimately glued to the transverse wall. - More precisely and without limiting the invention to the following dimensions, considering the common rail application and the fuel pressure that can rise to several thousands of bars, the central bore of the rail is about 10 mm diameter, the
transverse wall 34 has a thickness of about 1mm, thestrain gauge 42 being of about 1 mm2 and the wafer 43 is about 5 mm in diameter. - As shown in
figure 4 theelectric connector 24, previously introduced, has a small profile and is provided withelectrical pins 44 adapted to complementary connect to another connector, not shown, linked to thecommand unit 20. In this context "small profile" is to be understood as having the minimum necessary size enabling said complementary connection. Theconnector 24 may axially extend as shown infigure 2 or make an angle as infigure 4 where it is represented provided with a cylindrical engagement feature arranged around the end of the rail. Other connection types are possible such as an engagement inside the recess. - Internally, said
connector 24 is provided withelectrical leads 46 linking saidforce sensing device 42 to thepins 44 so that the fuel pressure in the inner space S deforms thetransverse wall 34, said deformation is sensed by theforce sensing device 42 which can transmit to the command unit a signal indicative of the fuel pressure. - Thanks to this integrated
arrangement 22, the required manufacturing is limited and the necessary space to accommodate the rail and the sensor on the engine is reduced. - As indicated on the figure, the
pressure sensor 14 that is in the prior art a separate component integrating in a body fixed to the rail, the wall, the sensing device, the leads and the connector, is now divided in individual components better integrated with therail 12. - In a second embodiment presented on
figure 5 , for mechanical resistance purposes thetransverse wall 34 is much thicker than infigures 3 and 4 . Theforce sensing device 42 remains glued on theouter face 38 and, to enable proper sensing, athinning recess 48 is arranged in thetransverse wall 14. Said recess 48 axially extends in thewall 34 from theinner face 36 to abottom face 50 so that, the remaining thickness between saidbottom face 50 and theouter face 38 is about 1mm. - In an alternative to the second embodiment, presented on
figure 6 theouter recess 40 opening at thefirst end 16 of the common rail is enlarged defining anannular groove 52 surrounding the central area of thewall 34 where is fixed theforce sensing device 42. - In a third embodiment, shown on
figure 7 , thetransverse wall 34 is provided with a central throughaperture 54 axially extending between the inner 36 and outer 38 faces. Theforce sensing device 42 fixed on its wafer 43 is glued to ametallic plug 56 of about 1mm thickness, saidplug 56 being fixed on theouter face 38 over the opening of theaperture 54. Theplug 56 can be welded, laser welded or any other fixation means can be used provided it resists to the pressure in the inner space S. - In alternative embodiments not shown, the
transverse wall 34 can be arranged closer to the very end of therail 12, the resultingrecess 40 being shallow or, saidtransverse wall 34 can even be arranged at the very end of the rail without defining arecess 40, theforce sensing device 42 still being fixed to theouter face 38 of the transverse wall and, theconnector 24 with an appropriate design would also be fixed to the rail and would provide the required protection to the sensing device. - Furthermore, the volume inside the connector, whether with a
recess 40 or with a flush end wall, may be filled with moulding plastics that would provide further protection to the sensing device. -
- X
- longitudinal axis
- S
- internal space
- 10
- fuel injection equipment
- 12
- common rail
- 14
- pressure sensor
- 16
- first end of the common rail
- 18
- pressure limiting valve
- 20
- command unit
- 22
- arrangement of a common rail and a pressure sensor
- 24
- connector
- 26
- inlet
- 28
- outlet
- 30
- ear member
- 32
- peripheral wall of the common rail
- 34
- transverse wall of the common rail
- 36
- inner face
- 38
- outer face
- 40
- recess
- 42
- force sensing device
- 43
- wafer
- 44
- pins
- 46
- electrical leads
- 48
- recess
- 50
- bottom of the recess
- 52
- annular groove
- 54
- aperture
- 56
- plug
Claims (6)
- An arrangement of a common rail and a pressure sensor, the common rail (12) adapted to be arranged in a fuel injection equipment (10) of an internal combustion engine, said common rail (12) having an elongated body extending along a longitudinal axis (X) from a first end (16) wherein is arranged the pressure sensor (42) to a second end, said body defining a substantially cylindrical peripheral wall (32) surrounding a cylindrical internal space (S) wherein in use, highly pressurised fuel is stored, wherein
the common rail (12) further comprises a transverse wall (34) arranged in the vicinity of said first end (16), said transverse wall (34) sealingly closing said internal space (S) so that, in use, pressurised fuel retained in the inner space (S) exerts forces on an inner face (36) of said transverse wall (34) and wherein the transverse wall (34) is arranged slightly inside the first end (16) of the common rail thus defining a recess (40) opening in said first end, the recess being defined between the very end of the peripheral wall and an outer face (38) of the transverse wall (34) that forms the bottom of said recess (40) and wherein said transverse wall (34) is integral to the peripheral wall (32), the pressure sensor having a force sensing device (42) fixed on the outer face of the transverse wall (34) and residing within the recess (40), said force sensing device (42) being adapted to generate a signal representative of the pressure in the internal space (S); the assembly further comprising an electric connector (24) arranged at the first end (16) of the common rail, said connector (24) having pins (44) electrically connected to the force sensing device (42). - An arrangement of a common rail and a pressure sensor as claimed in claim 1 wherein said transverse wall (34) is provided with a thinning feature (48) reducing locally the thickness of the wall.
- An arrangement of a common rail and a pressure sensor as claimed in claim 1 or 2 wherein said force sensing device (42) is a strain gauge.
- An arrangement of a common rail and a pressure sensor as claimed in claim 3, the force sensing device (42) being fixed on said outer face (38) of the transverse wall (34) and, said recess (40) being filled with moulded plastics.
- Assembly of an arrangement of a common rail and a pressure sensor as claimed in claim 4 and a pressure limiting valve (18).
- Fuel injection equipment (10) comprising an arrangement of a common rail and a pressure sensor as claimed in claim 1 or 2.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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GB201618256A GB2555453B (en) | 2016-10-28 | 2016-10-28 | Integrated arrangement of a common rail and a pressure sensor |
Publications (2)
Publication Number | Publication Date |
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EP3315762A1 EP3315762A1 (en) | 2018-05-02 |
EP3315762B1 true EP3315762B1 (en) | 2020-08-05 |
Family
ID=57963529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17198107.9A Active EP3315762B1 (en) | 2016-10-28 | 2017-10-24 | Integrated arrangement of a common rail and a pressure sensor |
Country Status (2)
Country | Link |
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EP (1) | EP3315762B1 (en) |
GB (1) | GB2555453B (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3937087A (en) * | 1974-07-05 | 1976-02-10 | Canadian Patents & Development Limited | Transducer for engine fuel injection monitoring |
DE19813756A1 (en) * | 1998-03-27 | 1999-10-07 | Siemens Ag | Fluid pressure measuring method |
DE10132245A1 (en) * | 2001-07-04 | 2003-01-23 | Bosch Gmbh Robert | Flameproof high pressure plenum |
JP4260449B2 (en) * | 2002-09-20 | 2009-04-30 | 臼井国際産業株式会社 | Common rail |
DE10310114A1 (en) * | 2003-03-06 | 2004-09-16 | Robert Bosch Gmbh | Device and method for hydrostatic pressure determination in a high pressure container by means of ultrasonic transit time measurement |
DE102005053683A1 (en) * | 2005-11-10 | 2007-05-16 | Bosch Gmbh Robert | Fuel injection system for internal combustion engines |
DE102008017151B3 (en) * | 2008-04-03 | 2009-08-27 | Continental Automotive Gmbh | Fuel injection system for an internal combustion engine |
DE102008035491B4 (en) * | 2008-07-30 | 2022-10-27 | Mercedes-Benz Group AG | Rail assembly of a fuel injection system |
DE102009002793B4 (en) * | 2009-05-04 | 2011-07-07 | MTU Friedrichshafen GmbH, 88045 | Common rail fuel injection system and internal combustion engine, electronic device and method for controlling and / or regulating an internal combustion engine |
GB201411598D0 (en) * | 2014-06-30 | 2014-08-13 | Delphi International Operations Luxembourg S.�.R.L. | Pressure limiting valve |
EP3088729B1 (en) * | 2015-04-30 | 2018-07-04 | Robert Bosch Gmbh | Fuel injector and device and method for assembly of a measuring device |
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2016
- 2016-10-28 GB GB201618256A patent/GB2555453B/en not_active Expired - Fee Related
-
2017
- 2017-10-24 EP EP17198107.9A patent/EP3315762B1/en active Active
Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
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GB201618256D0 (en) | 2016-12-14 |
EP3315762A1 (en) | 2018-05-02 |
GB2555453B (en) | 2019-12-25 |
GB2555453A (en) | 2018-05-02 |
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