US3567191A - Fluidic fuel system with back pressure control - Google Patents

Fluidic fuel system with back pressure control Download PDF

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Publication number
US3567191A
US3567191A US3567191DA US3567191A US 3567191 A US3567191 A US 3567191A US 3567191D A US3567191D A US 3567191DA US 3567191 A US3567191 A US 3567191A
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US
United States
Prior art keywords
fluid
fuel
reservoir
return
fluidic
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.)
Expired - Lifetime
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English (en)
Inventor
Donald F Morgan
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Bendix Corp
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Bendix Corp
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Filing date
Publication date
Application filed by Bendix Corp filed Critical Bendix Corp
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Publication of US3567191A publication Critical patent/US3567191A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/003—Circuit elements having no moving parts for process regulation, (e.g. chemical processes, in boilers or the like); for machine tool control (e.g. sewing machines, automatic washing machines); for liquid level control; for controlling various mechanisms; for alarm circuits; for ac-dc transducers for control purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/002—Circuit elements having no moving parts for controlling engines, turbines, compressors (starting, speed regulation, temperature control or the like)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S123/00—Internal-combustion engines
    • Y10S123/10—Fluidic amplifier fuel control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/69—Fluid amplifiers in carburetors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/212—System comprising plural fluidic devices or stages
    • Y10T137/2125—Plural power inputs [e.g., parallel inputs]
    • Y10T137/2142—With variable or selectable source of control-input signal

Definitions

  • a fuel system having fluid logic components is provided with means of maintaining fluid back pressure within the fluid logic element at a constant level regardless of the attitude and operative situation of the fuel system.
  • a preferred embodiment of the back pressure maintaining means comprises a narrow reservoir maintained behind a weir into which all fluid exhaust and vent passages are connected at an inlet point below the top of the weir. Fluid discharge in excess of the reservoir volume spills over the weir into a return line where it is returned to the fuel tank.
  • the present invention relates to the art of fuel handling and metering for mixture with air to provide a combustible mixture for an internal combustion engine. More specifically, the present invention relates to fuel systems which employ fluid logic elements to control the fuel metering.
  • All of these variously ratioed enriched mixtures may be provided by controllably altering the control signals to the primary computing element through additional fluid logic circuitry.
  • systems that provide accurate fuel/air ratios in tests simulating all engine requirements suddenly become highly inaccurate misapproximations when these identical systems are installed in automobiles wherein the system is subjected to vibration and other types of periodic and aperiodic motion.
  • the main, or primary, fluidic stage comprises a nozzle discharging pressurized fluid into a fluid interaction region where control signals, disposed laterally of the fluid stream, deflect the stream towards one of a plurality of outlet ports.
  • the fluid is fuel
  • one outlet port is associated with a fuel discharge nozzle in the air intake of the engine while another outlet port permits fuel entering thereinto to be returned to the fuel tank.
  • the present invention comprises the addition of a constant volume reservoir within the fuel return portion of a fluidic fuel system, in proximity to the fluidic computing and metering portion of the system which insulates that portion of the system from the fuel tank and from a major portion of the return-line.
  • attitude effects upon the fuel return system are significantly reduced thereby stabilizing the attitude responsive component of the pressure variation at the fuel vent port in the primary metering element.
  • Acceleration (inertial) effects are minimized by permitting only a minimum of fluid to be retained within the reservoir and by orienting the reservoir, with respect to the vehicle, so that an acceleration of the vehicle will cause minimal fluid forces to be exerted upstream of the reservoir.
  • FIG. 1 shows, in schematic form, a fuel system for a vehicle incorporating the present invention.
  • FIG. 2 shows the preferred embodiment of the insulating reservoir means in a top view with the cover plate removed.
  • FIG. 3 shows the insulating reservoir means of FIG. 2 in a sectional view taken along line 3--3 in FIG. 2.
  • FIG. 4 shows a sectional view, taken along line 44 in FIG. 5, of an alternative isolating reservoir for use in the system shown in FIG. 1.
  • FIG. 5 shows a side view of the reservoir of FIG. 4.
  • a representative fuel system comprising a fuel tank 10, a fuel pumping means 12, a fuel metering and discharge means 14, and insulating means 16.
  • Conduit 18 provides fuel to the pump inlet
  • conduit 20 communicates fuel under elevated pressure to the fuel metering and discharge means 14
  • return conduit 22 communicates excess fuel from the insulating means 16 to the fuel tank 10.
  • Return conduit 22 includes a check valve 24 which is operative to prevent fluid flow in the return line from reversing as might happen if the tank were elevated above the insulating means.
  • the fuel metering and discharge means 14 has been illustrated as including a fluidic computation means illustrated as fluidic device 26 which includes a pair of outlet passages, 28 and 30, a pair of control passages 32 and 34 and a power stream input passage 36 which receives pressurized fuel from the fuel pump 12.
  • Outlet passage 28 is adapted to receive the controlled power fluid stream from input passage 36 and to communicate the fluid, which in this instance is metered fuel, to a discharge nozzle 38 situated in the air intake 40 of an engine, not shown.
  • the control passage 34 of the fluid logic amplifier 26 could be, for instance, in communication with the venturi 42 where it would receive as a control signal the depression at the venturi 42 which is indicative of air flow to the engine, not shown, and which would comprise the primary signal indicative of the engine fuel demand.
  • Control passage 32 would be arranged to establish an operating bias for the amplifier 26 as, for instance, by connection to a pressure source such as the atmosphere. It will be recognized that while the fuel metering and discharge means 14 has only a single stage of amplification and receives but one control input, it is merely illustrative of a rudimentary fluidic fuel metering device of the type hereinbefore noted and of which more complete and complex forms are known. It should be evident that with more than one stage of amplification and additional fuel return or vent passages, the inertial effects upon the fuel in the return system become more critical.
  • the insulating means 16 comprise an enclosure or body 100 having a partition or weir 102 situated therein to form a reservoir 103.
  • the body 100 further includes a fluid inlet 104 arranged to discharge fluid into the reservoir 103 while a discharge passage 106 is arranged to exhaust fluid, in excess of the reservoir volume, from the enclosure 100.
  • the discharge passage 106 is in communication with the return line 22 so that the fluid discharged, which in a fuel system as illustrated in FIG. 1 would be gasoline, would be returned to the fuel tank 10.
  • the inlet to discharge passage 106 is shown as being sealed by floating ball 110. Other suitable means to prevent air from entering the return line would be applicable.
  • An air inlet 108 is arranged to maintain the pressure within the enclosure at the prevailing atmospheric or an ambient pressure depending upon the pressure desired by the system designer.
  • the fluid inlet 104 communicates the reservoir 103 with the fluidic element vent passage means here illustrated by excess fluid outlet but which should be considered representative of the fluid vents and excess fluid passages within the fluidic computing portion of the system.
  • the fluid inlet is arranged to discharge all or substantially all, excess fluid into the reservoir.
  • the reservoir has a pair of lateral dimensions and is oriented with the minor lateral dimension being parallel to the direction of motion of the vehicle. This is indicated by the MOTION arrows in FIGS. 2 and 3.
  • the insulating means 16 comprises a body 200 forming a chamber having a partition of weir 202 located therein forming a reservoir 203.
  • the insulating means 16 further includes a fluid inlet passage 204 and fluid exhaust passage 206 located on opposite sides of the weir or dam 202.
  • the outlet passage 206 is connected, via return line 22 including check valve 24, to the fuel tank 10.
  • the fluid inlet passage 204 is located so as to discharge fluid substantially into the center of the reservoir 203 behind the weir 202 and is connected to the fuel vent and exhaust passage system of the fuel metering and discharge means 14.
  • the fluid inlet 204 would be connected to each fuel return and vent passage in a fuel metering and discharge means 14 having more than one fluid logic element.
  • the insulating device 16 is also of utility in those systems utilizing positive pressure, as opposed to the negative pressure venturi depression systems.
  • the arrow labeled MOTION in FIG. 5 illustrates the orientation of the device with regard to the forward and reverse motion of a vehicle having forward and reverse motion parallel to the MOTION arrow.
  • fuel under pressure would be provided by pumping means 12 to the fluid logic element calculating stage 26 of the fuel metering and discharge means 14. Sufficient fuel would have to be provided so that there would be sufficient fuel available to satisfy the most extreme demands. This would mean that under all other operating conditions, the fuel provided to the main or primary metering element 26 would be in excess of the existing demand. The excess fuel would have to be returned to the fuel tank.
  • the insulating device 16 is interposed between the fuel metering and discharge means 14, and fuel tank 10. The excess fuel is communicated through inlet passage 104 so as to fill the reservoir 103 to form a substantially constant volume reservoir of excess fuel.
  • the insulating device 16 may be placed in proximity to the fuel metering and discharge means 14 so that the total volume of fuel within the conduit communicating the fluid logic element fluid vent to the reservoir is reduced.
  • the insulating element 16 has a major lateral dimension which is substantially greater than the minor lateral dimension. This aids in reducing the volume of the reservoir. It is of particular advantage when the isolating device is oriented with the minor lateral dimension substantially parallel to the direction of vehicular motion, and hence the direction of the majority of acceleration forces. In this orientation, attitude changes to the fuel system are less pronounced and the narrowness of the reservoir causes fuel depth at the outlet of the fluid inlet passage 104 to remain substantially constant for vehicle acceleration and deceleration.
  • the depth of the reservoir 103 would be readily controllable by varying partition height or by varying the vertical placement of the passage 104 during fabrication of the isolating means 16 to provide a substantially constant back pressure on the fluidic computing and discharge means on the order of 1 to 2 inches of fuel.
  • This substantially constant back pressure would permit the fuel system designers to virtually ignore the inertial force problems and to design the system to operate with a known, substantially constant back pressure.
  • isolating means interposed in the return means downstream of the fluid element means operative to substantially eliminate the influence of the inertial effects of the fluid in the return means on the fluid element means.
  • a chambered body having a fluid inlet means and a fluid exhaust means
  • said fluid inlet means communicating with the fluid return passage of the fluid logic device via a first portion of the return means
  • said fluid exhaust means communicating with the fluid supply via a second portion of the return means
  • a partition located in said chambered body operative to form a reservoir region in the vicinity of said fluid inlet means
  • said reservoir operative to prevent direct fluid communication between said fluid inlet means and said fluid exhaust means.
  • said inlet port is in a plane substantially parallel to the direction of the majority of inertia forces exerted on the system.
  • said fluid inlet means includes a fluid inlet port arranged to discharge fluid into said reservoir thereby establishing a substantially constant fluid back pressure for the fluid logic device metering means.
  • a fuel system for engines comprising: a source of fluid; pumping means communicating with said source of fluid operative to provide a pressurized fluid stream;
  • fluidic means for receiving said fluid stream and operative to produce a first fluid flow controlling engine fuel
  • insulating means operative to maintain a substantially constant level of fluid pressure in said return means between said fluidic means and insulating means.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US3567191D 1969-07-15 1969-07-15 Fluidic fuel system with back pressure control Expired - Lifetime US3567191A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US84184069A 1969-07-15 1969-07-15

Publications (1)

Publication Number Publication Date
US3567191A true US3567191A (en) 1971-03-02

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ID=25285811

Family Applications (1)

Application Number Title Priority Date Filing Date
US3567191D Expired - Lifetime US3567191A (en) 1969-07-15 1969-07-15 Fluidic fuel system with back pressure control

Country Status (8)

Country Link
US (1) US3567191A (de)
JP (1) JPS4943747B1 (de)
BR (1) BR7020523D0 (de)
CA (1) CA919534A (de)
DE (1) DE2034915C3 (de)
FR (1) FR2054135A5 (de)
GB (1) GB1295361A (de)
SE (1) SE353764B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628774A (en) * 1971-03-17 1971-12-21 Bendix Corp Fluidic fluid-metering system
US4165348A (en) * 1976-08-26 1979-08-21 Chiyoda Chemical Engineering And Construction Company Ltd. Apparatus for fuel supply to spark ignition type internal combustion engine
US20170254243A1 (en) * 2016-03-01 2017-09-07 Caterpillar Inc. Accumulator for an engine exhaust treatment system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6291479U (de) * 1985-11-27 1987-06-11

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628774A (en) * 1971-03-17 1971-12-21 Bendix Corp Fluidic fluid-metering system
US4165348A (en) * 1976-08-26 1979-08-21 Chiyoda Chemical Engineering And Construction Company Ltd. Apparatus for fuel supply to spark ignition type internal combustion engine
US20170254243A1 (en) * 2016-03-01 2017-09-07 Caterpillar Inc. Accumulator for an engine exhaust treatment system
US10054021B2 (en) * 2016-03-01 2018-08-21 Caterpillar Inc. Accumulator for an engine exhaust treatment system

Also Published As

Publication number Publication date
FR2054135A5 (de) 1971-04-16
GB1295361A (de) 1972-11-08
DE2034915B2 (de) 1973-10-11
DE2034915A1 (de) 1971-01-28
DE2034915C3 (de) 1974-05-16
BR7020523D0 (pt) 1973-02-20
JPS4943747B1 (de) 1974-11-22
CA919534A (en) 1973-01-23
SE353764B (de) 1973-02-12

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