US3589384A - Flow rate-responsive fuel mixture control device with servomechanism - Google Patents

Flow rate-responsive fuel mixture control device with servomechanism Download PDF

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Publication number
US3589384A
US3589384A US782689A US3589384DA US3589384A US 3589384 A US3589384 A US 3589384A US 782689 A US782689 A US 782689A US 3589384D A US3589384D A US 3589384DA US 3589384 A US3589384 A US 3589384A
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US
United States
Prior art keywords
flow passage
passage section
fuel
control member
static pressure
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
Application number
US782689A
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English (en)
Inventor
Konrad Eckert
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
Original Assignee
Robert Bosch GmbH
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 filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3589384A publication Critical patent/US3589384A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/16—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors
    • F02M69/18—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air
    • F02M69/22—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air the device comprising a member movably mounted in the air intake conduit and displaced according to the quantity of air admitted to the engine
    • 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
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2499—Mixture condition maintaining or sensing
    • 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
    • Y10T137/3367—Larner-Johnson type valves; i.e., telescoping internal valve in expanded flow line section
    • Y10T137/3421—Line condition change responsive
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7759—Responsive to change in rate of fluid flow
    • Y10T137/776—Control by pressures across flow line valve

Definitions

  • Greigg ABSTRACT In the air suction tube of a fuel injection system associated with an internal combustion engine, there is displaceably held a control member which regulates a flow passage section for the air and meters the fuel in response to the change in the flow rate of air in the suction tube.
  • the change in the static air pressure due to the change in the flow rate is utilized as an input force to control a servocircuit whose relatively large output force is used directly to displace said I control member.
  • This invention relates to fuel injection systems associated with externally ignited internal combustion engines for particular use in motor vehicles.
  • Said systems are of the type wherein the supply of air is controlled by an arbitrarily operable throttle member (butterfly valve) disposed in the suction tube and wherein the unmixed air in the suction tube flows past a displaceably held control member at least partially disposed within the suction tube-The control member, by virtue of its displacement, which is a function of the variations in the flow rate of air, varies a flow passage section in the suction tube.
  • the fuel is, at a constant pressure drop, continuously metered at a variable throttle as a function of the position of said control member.
  • the purpose of fuel injection systems of the above type is to provide favorable mixture ratios permitting a complete combustion of the fuel at the highest possible efficiency of the engine with the lowest possible fuel consumption.
  • the fuel is metered by a control member which is positioned as a function of the flow rate of air and which automatically regulates an air flow passage section in the suction tube, so that there is maintained a substantially constant static air pressure in the narrowest portion of the flow passage section.
  • a control member which is positioned as a function of the flow rate of air and which automatically regulates an air flow passage section in the suction tube, so that there is maintained a substantially constant static air pressure in the narrowest portion of the flow passage section.
  • the control member is displaceable by means of a hydraulic servo mechanism including a servo element which is moved by a pneumatic actuator.
  • the latter operates as a function-of the static air pressure prevailing at the at least approximately narrowest portion of the flow passage section which, in turn, is varied by the control member.
  • the servo element and the pneumatic actuator are interconnected in such a manner that the control member, in case of an increased static pressure of the air, is displaced in a direction to decrease the flow passage section for the air and, conversely, when the static air pressure decreases, the control member is displaced in the opposite direction and thus increases the flow passage section.
  • a closed servo circuit (forming part of the servomechanism) and, secondly, the static pressure regulated by this servocircuit remains substantially constant at the narrowest portion of the flow passage section.
  • the air required for the combustion passes in the direction of the arrow through a two-part suction tube 1 and flows past a control member generally indicated at 2 and an arbitrarily actuated butterfly valve 3 towards the cylinders (not shown) of an internal combustion engine (not shown).
  • the fuel is drawn from a tank 4 through a filter 5 by means of a pump 6 and, flowing past a bypass 7 provided with an overflow valve 8, is led through a pressure conduit 9 under constant pressure to a fuel metering device 10 illustrated only in a schematic manner.
  • a fuel conduit 11 leads from the metering device 10 to one or several nozzles 12 through which the fuel, preferably shortly upstream of the cylinder or cylinders, is injected into the suction tube 1.
  • the control member 2 comprises a hollow cylinder axially slidably held on a guiding tube 14 and coaxially disposed in a funnel-shaped portion 13 of the suction tube 1. To the cylinder 15 there is internally and axially secured a piston 16 slidably disposed within the guiding tube 14.
  • the cylinder 15 is provided with an upstream narrowing streamlined conical outer face which, together with the funnel-shaped portion 13, forms a narrow flow passage section 17 for the air.
  • An outer portion of cylinder 15 is formed .as a cam 18 associated with a follower pin 19 which, upon displacement of cylinder 15, actuates a throttle (not shown) in the fuel metering device 10 for controlling the quantity of fuel admitted to conduit 11.
  • the guiding tube 14 which at its downstream end is closed fluidtight by a threaded screw cap 20, is pressfitted into a sleeve 21 rigidly held coaxially within the suction tube 1 by means of webs 22.
  • a spring 24 which, at one end, is attached to the piston 16 and, at the other end, is freely rotatably hooked to the screw cap 20.
  • the spring 24 tends to displace the piston 16 together with the cylinder 15 in a downstream direction.
  • a fuel conduit 25 communicates with space 23 so that the downstream terminal face 26 of the piston 16 is adapted to be exposed to the fuel pressure prevailing in conduit 9, as it will become apparent hereinafter.
  • the inner space 27 of the cylinder 15 communicates with a conduit 27a through which the fuel, leaking past piston 16 from space 23, is returned to tank 4.
  • the admission of fuel to the fuel conduit 25 is controlled by means of a servo element formed as a piston plunger 29 disposed in valve block 28 and displaceable by a pneumatically actuated membrane 30 to which it is attached.
  • a servo element formed as a piston plunger 29 disposed in valve block 28 and displaceable by a pneumatically actuated membrane 30 to which it is attached.
  • the membrane 30 serves as a septum separating spaces 31a and 31b in valve block 28.
  • the membrane 30 is, on its upper side, affected by the static pressure of the air prevailing in the flow passage section 17 and by the force of a compression spring 33 and, on its lower side, by the air pressure prevailing in the space 350 defined by portion 35 of the suction tube 1 downstream of the flow passage section 17.
  • the static pressure prevailing in the approximately narrowest portion of the flow passage section 17 is admitted to space 310 through port 32, while the pressure in space 35a is admitted to space 31b through conduit 34.
  • the flow passage section of space 35a is relatively large; thus the air velocity therethrough is relatively small. As a result, an at least approximately total pressure of the air (static pressure plus dynamic pressure) prevails in conduit 34.
  • the fuel conduit 25 is either connected with the pressure conduit 9 through a conduit 36, or is connected with the tank 4 across a return conduit 37, or is blocked altogether.
  • the aforedescribed servomechanism includes a servocircuit controlled by an input force that is constituted by the static pressure of air prevailing in flow passage section 17.
  • means may be provided for an arbitrary adjustment of the effective length of spring 33 whereby its force is changed, thus affecting the function between the static pressure in flow passage section 17 and the position of the control member l5, l6.
  • the use of the servo force also means an increased camming force for the displacement of follower pin 19 effecting the metering of the fuel.
  • the throttling losses in the flow passage section 17 may be maintained at a small value since a smaller pressure drop is necessary for the actuation of piston plunger 29 by membrane 30 than would be required were the pressure drop directly applied for the displacement of the cylinder 15.
  • the system operates independently of the designed structural position of the control member 15, 16.
  • a fuel injection system associated with an internal combustion engine comprising A. a suction tube for drawing air,
  • a fuel metering device including a throttle
  • a control member at least partially disposed in said suction tube and held displaceably therein, said control member being displaced in response to changes in said flow rate; said control member, by virtue of its displacement, simultaneously varying an air flow passage section in said suction tube and controlling the throttle of said fuel metering device,
  • a hydraulic servo mechanism for displacing said control member and including 1. displaceable means responsive to the changes in the static air pressure prevailing in the approximately narrowest part of said flow passage section, and
  • a servocircuit controlled by said displaceable means for moving said control member in a direction of decreasing said flow passage section when said static pressure increases and in a direction of increasing said flow passage section when said static pressure decreases; said servo mechanism tending to maintain constant said static pressure at the approximately narrowest portion of said flow passage section.
  • said displaceable means includes an actuator member directly affected by said static pressure and a servo element movable by said actuator member for controlling said servo circuit.
  • suction tube includes a funnel-shaped portion, a guiding tube coaxially and fixedly held in said suction tube
  • said control member includes a hollow cylinder axially slidably held on said guiding tube and a piston fixedly secured to the inside of said cylinder and slidably received in said guiding tube, said piston is directly affected by the opposing forces ofa hydraulic fluid in said servocircuit and of a spring disposed within said guiding tube.
  • said actuator member is a membrane, one side of which is exposed to said static air pressure, the other side of which is exposed to the total air pressure prevailing in said suction tube.
  • said servo element is formed by a piston plunger attached to and movable by said actuator member; said piston plunger is, when said static pressure increases, adapted to establish communication between the inside of said guiding tube and a means containing hydraulic fluid under pressure, causing thereby to displace said piston and said cylinder in an upstream direction to decrease said flow passage section; said piston plunger is, when said static pressure decreases, adapted to establish communication between the inside of said guiding tube and a tank means, causing thereby said piston and said cylinder to be displaced by said spring in a downstream direction to increase said flow passage section.
  • said hydraulic fluid is fuel used for combustion in said engine
  • said tank means is constituted by a fuel tank and said means containing hydraulic fluid under pressure is a conduit communicating with said fuel tank and containing fuel pressurized by a fuel pump that simultaneously delivers fuel to said fuel metering device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US782689A 1968-01-05 1968-12-10 Flow rate-responsive fuel mixture control device with servomechanism Expired - Lifetime US3589384A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1601360 1968-01-05

Publications (1)

Publication Number Publication Date
US3589384A true US3589384A (en) 1971-06-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
US782689A Expired - Lifetime US3589384A (en) 1968-01-05 1968-12-10 Flow rate-responsive fuel mixture control device with servomechanism

Country Status (6)

Country Link
US (1) US3589384A (fr)
JP (1) JPS5114647B1 (fr)
AT (1) AT293103B (fr)
FR (1) FR1588750A (fr)
GB (1) GB1200041A (fr)
SE (1) SE338898B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739758A (en) * 1970-11-07 1973-06-19 Bosch Gmbh Robert Regulator mechanism for fuel injection apparatus
US3751016A (en) * 1970-04-24 1973-08-07 Westinghouse Freins & Signaux Carburetion system
US3867917A (en) * 1971-07-09 1975-02-25 Johannes Zeyns Combustion machines
US3951119A (en) * 1973-06-09 1976-04-20 Robert Bosch G.M.B.H. Fuel injection system
US3953548A (en) * 1973-09-13 1976-04-27 Robert Bosch Gmbh Fuel injection system
US4286615A (en) * 1978-03-21 1981-09-01 Robert Bosch Gmbh Apparatus for measuring the amount of fluid supplied by a fluid supply device
US4739650A (en) * 1985-11-19 1988-04-26 Nippondenso Co., Ltd. Gas flow measuring apparatus
US5375620A (en) * 1994-02-25 1994-12-27 Graham-White Mfg. Co. Self-adjusting flow metering device
US20190264715A1 (en) * 2018-02-28 2019-08-29 Jungheinrich Aktiengesellschaft Line rupture safeguard for a hydraulic cylinder

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2637467A1 (de) * 1976-08-20 1978-02-23 Bosch Gmbh Robert Vorrichtung zur fuehrung eines schwenkbar um eine achse gelagerten schwenkkoerpers
DE102009034684A1 (de) * 2009-07-24 2011-05-12 Voith Patent Gmbh Injektorventil, insbesondere zur Druckluftaufladung einer Brennkraftmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1550717A (en) * 1923-10-25 1925-08-25 Elton L Towle Rate-control valve
US1620131A (en) * 1925-06-27 1927-03-08 Price Owen Alfred Automatic self-closing valve
US2330650A (en) * 1939-05-27 1943-09-28 Weiche Georg Charge former
US2820364A (en) * 1952-01-31 1958-01-21 Bendix Aviat Corp Fluid flow measuring apparatus
GB885821A (en) * 1958-04-10 1961-12-28 Teddington Aircraft Controls L Improvements in or relating to fluid pressure regulators
GB938222A (en) * 1958-10-18 1963-10-02 Ad Struever G M B H Improvements in or relating to flow control devices for regulating the flow of liquid through a tanker vehicle discharge hose

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1066721A (en) * 1965-03-13 1967-04-26 Su Carburetter Co Ltd Fuel injection systems for spark-ignition internal combustion engines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1550717A (en) * 1923-10-25 1925-08-25 Elton L Towle Rate-control valve
US1620131A (en) * 1925-06-27 1927-03-08 Price Owen Alfred Automatic self-closing valve
US2330650A (en) * 1939-05-27 1943-09-28 Weiche Georg Charge former
US2820364A (en) * 1952-01-31 1958-01-21 Bendix Aviat Corp Fluid flow measuring apparatus
GB885821A (en) * 1958-04-10 1961-12-28 Teddington Aircraft Controls L Improvements in or relating to fluid pressure regulators
GB938222A (en) * 1958-10-18 1963-10-02 Ad Struever G M B H Improvements in or relating to flow control devices for regulating the flow of liquid through a tanker vehicle discharge hose

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751016A (en) * 1970-04-24 1973-08-07 Westinghouse Freins & Signaux Carburetion system
US3739758A (en) * 1970-11-07 1973-06-19 Bosch Gmbh Robert Regulator mechanism for fuel injection apparatus
US3867917A (en) * 1971-07-09 1975-02-25 Johannes Zeyns Combustion machines
US3951119A (en) * 1973-06-09 1976-04-20 Robert Bosch G.M.B.H. Fuel injection system
US3953548A (en) * 1973-09-13 1976-04-27 Robert Bosch Gmbh Fuel injection system
US4286615A (en) * 1978-03-21 1981-09-01 Robert Bosch Gmbh Apparatus for measuring the amount of fluid supplied by a fluid supply device
US4346727A (en) * 1978-03-21 1982-08-31 Robert Bosch Gmbh Apparatus for measuring the amount of fluid supplied by a fluid supply device
US4739650A (en) * 1985-11-19 1988-04-26 Nippondenso Co., Ltd. Gas flow measuring apparatus
US5375620A (en) * 1994-02-25 1994-12-27 Graham-White Mfg. Co. Self-adjusting flow metering device
US20190264715A1 (en) * 2018-02-28 2019-08-29 Jungheinrich Aktiengesellschaft Line rupture safeguard for a hydraulic cylinder
US10900505B2 (en) * 2018-02-28 2021-01-26 Jungheinrich Aktiengesellschaft Line rupture safeguard for a hydraulic cylinder

Also Published As

Publication number Publication date
AT293103B (de) 1971-09-27
GB1200041A (en) 1970-07-29
FR1588750A (fr) 1970-04-17
SE338898B (fr) 1971-09-20
JPS5114647B1 (fr) 1976-05-11

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