US3628515A - Measuring device for a fuel injection system - Google Patents

Measuring device for a fuel injection system Download PDF

Info

Publication number
US3628515A
US3628515A US75350A US3628515DA US3628515A US 3628515 A US3628515 A US 3628515A US 75350 A US75350 A US 75350A US 3628515D A US3628515D A US 3628515DA US 3628515 A US3628515 A US 3628515A
Authority
US
United States
Prior art keywords
measuring device
slider
fuel
arm
suction duct
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
US75350A
Other languages
English (en)
Inventor
Heinrich Knapp
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 US3628515A publication Critical patent/US3628515A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • F02M69/26—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 varying fuel pressure in a fuel by-pass passage, the pressure acting on a throttle valve against the action of metered or throttled fuel pressure for variably throttling fuel flow to injection nozzles, e.g. to keep constant the pressure differential at the metering valve
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/48—Arrangement of air sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/28—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • a roller on the arm controls the rotatable slider of a measuring and distributing valve and engages frictionally with an eccentric point on the end face of the slider.
  • the invention relates to a measuring device for a fuel injection system for external-ignition combustion engines operating with compression of the fuel mixture and with continuous injection into the suction duct.
  • the measuring device and an arbitrarily adjustable throttle are provided in spaced arrangement in the suction duct, the measuring device comprising a valve disc perpendicular to the direction of airflow and subject to a return force as well as to the pressure of the airflow so as to deflect into a conically outwardly flared section of the suction duct proportionally to the rate of airflow and control the flow area of a fuel valve for measuring off an amount of fuel proportional to that of the air.
  • the object of this fuel injection system is to provide automatically in an Otto engine under all operating conditions a favorable fuel-to-air ratio, so as to obtain complete combustion and avoid as far as possible the generation of poisonous exhausts with the engine operating at the highest possible efficiency or with a minimum of fuel consumption.
  • the deflection of the sensor member of the measuring device should be substantially proportional to rate of airflow in the suction duct and make possible a simple control of the measuring valve for delivering an amount of fuel that is proportional to that of the air.
  • this proportionality, as well as the correct fuel-to-air ratio is lost as soon as vibrations of the engine cause errors in the deflection of the sensor, leading, for instance, to incomplete combustion with increased fuel consumption and poisonous exhausts.
  • an extremely weak spring is provided for exerting the return force on the sensor member, the latter being in the form of a disc which is pivotable about an axis.
  • the capacity of this measuring device is dependent on the eccentricity of the axis; however, this eccentricity is limited by the diameter of the suction duct, so that capacity of the device is very limited.
  • the essential feature of the invention is the construction of the sensor valve disc as a plate which is attached to one end of a pivotable arm.
  • the arm is pivoted with low friction at a fixed point, the fuel valve being preferably a slide valve, the slider of which is responsive to the pivotable arm and controls at least one control notch for distributing-and measuring fuel via an annular notch on the slider which is connected to the fuel supply.
  • This immediate actuation of the slider practically eliminates mechanical play, which is of particular importance with the engine idling, since in that condition even small displacements of the slider may result lIll relatively large variations of r.p.m.
  • the pivotable arm is pivoted at an intermediate point thereof and carries at one end the plate and at the other end a balancing counter weight. Owing to the balancing of the masses of the plate and of the arm itself, the area of the plate can be made comparatively large and in any case appreciably larger than that of the throttle.
  • a further reduction of friction effects is possible in a further embodiment in which a roller on the pivotable arm engages the slider end face eccentrically so as to cause rotation of the slide valve.
  • the pivotable arm has, at the point of engagement with the slider valve, a cam surface for varying the relationship between the deflection of the sensor and the displacement of the slider in dependence of the angular position of the arm. This may be necessary in order to eliminate deviations from the desired relationship, e.g., due to the form of the conical section of the suction duct.
  • the portion of the suction duct housing the sensor plate is part of a filter housing, whereby the combustion air passes through the air filter at the entrance end of the suction duct and then impinges on the sensor, where there will be under all circumstances a node of the air oscillation occurring in the suction duct.
  • FIG. I shows an embodiment having a roller for transmitting the force from the pivotable arm to the slider of the fuel distributor valve.
  • FIG. 2 shows a modified embodiment, in which a cam is provided on the pivotable arm for engaging the slider.
  • combustion air flows in the direction of the arrows through an air filter 2 mounted in a housing 1, into a suction duct having a conical section 3 defining a suction space with a sensor 4 provided therein, followed by a cured section 5, a connecting tube 6, and a section 7 with an arbitrarily adjustable throttle lB therein.
  • a suction tube (not shown), from which separate conduits branch off to the cylinders of the combustion engine.
  • Sensor 4 comprises a plate mounted perpendicularly to the direction of airflow on a pivotable arm 9 which is mounted on a pivot 10 so as to be movable in a plane. Angular movement of arm 9 causes sensor 4 to penetrate into conical section 3, which is outwardly flared in the direction of flow.
  • the deflection of sensor 4 is proportional to the rate of airflow, and if the return force acting of sensor 4 is constant and the air pressure obtaining ahead of it is also constant, the pressure obtaining between sensor 4 and throttle 8 will also be constant.
  • arm 9 is pivoted at an intermediate point to provide a two-armed lever having sensor 4 at one end thereof and a compensating weight 11 at the other end.
  • Weight 11 is attached to arm 9 by means of a screw l2 and adjustable in a slot 13.
  • Sensor 4 acts via arm 9 on an end face of a slider 15 of a distributor valve 16.
  • the other end face 17 of slider 15 is subject to a constant liquid pressure acting as a return force for sensor 4.
  • Fuel is supplied to valve 16 by a fuel pump 19, which is driven by an electric motor 20 and draws fuel from a container 21 and supplies it to valve 16 through a fuel line 22.
  • a return line 23 branches off from line 22 and has provided therein a pressure limiting relief valve 24.
  • Notch 25 connects, on the one hand, via channels 26 with an annular notch 27 of slider and, on the other hand, with a number of chambers 28 which are bounded by a diaphragm 29. Diaphragm 29 is therefore subject to the pressure of the supplied fuel.
  • annular notch 27 overlaps to a greater or lesser extent a number of control notches 30, which connect via channels 31 with corresponding chambers 32 on the opposite side of diaphragms 29 relative to chambers 28.
  • Diaphragm 29 serves as the movable valve member of a flat seat valve, which is, in normal operation, held open by a spring 34.
  • Chambers 28 and 32 act as diaphragm chambers which guarantee that the pressure drop ahead of and after the measuring points 27 and 30 remains constant independently of the degree of overlap between notch 27 and notches 30, i.e., independently of the amount of fuel flowing to the injection valves. This ensures the proportionality between the displacement of slide valve 15 and the measured-off fuel quantity.
  • the liquid serving to provide a constant return force on slider 15 is also fuel.
  • a line 36 is provided to branch off from line 22 into a space'37, into which extends the end 17 of slider 15.
  • a restriction 38 is provided for damping the movement of slider 15.
  • the pressure of the return force liquid can be varied by means not shown so as to change the factor of proportionality defining the fuel-to-air ratio.
  • FIGS. 1 and 2 differ merely in the transmission of the force from arm 9 to slider 15.
  • sensor 4 penetrates into a conical section 3 of the suction duct, and the annular space between it and the conical wall is therefore proportional to the deflection of sensor 4, there is in this embodiment also a direct proportionality between the deflection of sensor 4 and the displacement of slider 15. This ensures that under all conditions a proportional amount of fuel is added to the air flowing in the suction duct.
  • arm 9 translates the control movements of the sensor directly to the slide valve by means of a cam 41 provided thereon.
  • cam 41 the factor of proportionality between the deflection of sensor 4 and the displacement of slider 15 is variable. This may be necessary, for instance, for correcting errors in the fuel-to-air ratio due to throttling effects in the suction duct, since a measuring device, such as sensor 4, which relies on flow resistance, will tend to affect the filling of the engine cylinders at higher r.p.m.'s.
  • a measuring device for the fuel injection system of an external-ignition engine operating with compression of the fuel mixture and with continuous injection into the suction duct comprising:
  • said sensor member comprising a valve disc perpendicular to the direction of flow and subject to a return force and responsive to the airflow to deflect proportionally to the rate of airflow and penetrate into 'a conically outwardly flared portion of said suction duct, and
  • a fuel valve responsive to deflection of said sensor member to control the supply of fuel roportionally to the rate of air supply, characterized in t at said valve disc comprises a plate attached to one end of a pivotable arm having a fixed pivot point of low friction.
  • a measuring device comprising a slider in said fuel valve responsive to actuation by said pivotable arm, an annular notch on said slider connected to a fuel supply for said engine for proportioning the rate of fuel supply, and at least one radial control notch connecting said annular notch with an injection nozzle.
  • a measuring device in which said arm is pivoted at an intermediate point thereof and supports at one end said disc and at the other end a counterweight.
  • a measuring device in which the area of said disc is larger than that of said throttle.
  • a measuring device in which said arm carries a roller engaging said slider.
  • a measuring device in which said slider is rotatable and said roller has frictional and eccentric engagement therewith so as to cause rotation thereof upon movement of said arm.
  • a measuring device in which said arm at the point of engagement thereof with said slider is provided with a cam for adjustment of the interrelationship between sensor member deflection and slider displacement in dependence upon angular displacement of said arm.
  • a measuring device in which said sensor disc is provided in a section of said suction duct having a filter provided therein, whereby the air after passage thereof through said filter impinges said sensor disc at the entrance to said suction duct.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Fuel-Injection Apparatus (AREA)
US75350A 1969-12-01 1970-09-25 Measuring device for a fuel injection system Expired - Lifetime US3628515A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1960147 1969-12-01

Publications (1)

Publication Number Publication Date
US3628515A true US3628515A (en) 1971-12-21

Family

ID=5752571

Family Applications (1)

Application Number Title Priority Date Filing Date
US75350A Expired - Lifetime US3628515A (en) 1969-12-01 1970-09-25 Measuring device for a fuel injection system

Country Status (7)

Country Link
US (1) US3628515A (de)
JP (1) JPS5323450B1 (de)
AT (1) AT307807B (de)
ES (1) ES386029A1 (de)
FR (1) FR2072633A5 (de)
GB (1) GB1336604A (de)
SE (1) SE360427B (de)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728993A (en) * 1970-12-17 1973-04-24 Bosch Gmbh Robert Fuel injection apparatus including an air sensor and means for the direction-dependent damping of its movement
US3739758A (en) * 1970-11-07 1973-06-19 Bosch Gmbh Robert Regulator mechanism for fuel injection apparatus
US3777725A (en) * 1970-04-24 1973-12-11 Bosch Gmbh Robert Means for varying the air-fuel ratio in a fuel injection system for internal combustion engines
US3854462A (en) * 1971-10-14 1974-12-17 Porsche Kg Mixture preparation installation for a multi-cylinder injection internal combustion engine
US3915138A (en) * 1973-09-22 1975-10-28 Bosch Gmbh Robert Fuel injection system
US3916842A (en) * 1970-10-21 1975-11-04 Bosch Gmbh Robert Fuel injection apparatus for internal combustion engines
US3919992A (en) * 1973-09-28 1975-11-18 Bosch Gmbh Robert Fuel injection system
US3930479A (en) * 1972-09-07 1976-01-06 Robert Bosch G.M.B.H. Fuel metering device for externally ignited internal combustion engines with compression of the air-fuel mixture
US3931803A (en) * 1974-01-18 1976-01-13 Asoke Chattopadhayay Fuel quantity manifold for multi-cylinder internal combustion engines
US3951119A (en) * 1973-06-09 1976-04-20 Robert Bosch G.M.B.H. Fuel injection system
US3998614A (en) * 1973-09-12 1976-12-21 General Motors Corporation Internal combustion engine air induction assembly
US4026259A (en) * 1974-09-19 1977-05-31 Volkswagenwerk Aktiengesellschaft Fuel injection device for mixture-condensing, spark-ignited internal combustion engines
US4040405A (en) * 1975-06-10 1977-08-09 Nippon Soken, Inc. Fuel injection system for internal combustion engine
US4043304A (en) * 1973-05-02 1977-08-23 Robert Bosch Gmbh Fuel injection system for self-igniting internal combustion engines
US4058100A (en) * 1975-03-14 1977-11-15 Nippon Soken, Inc. Intake air flow rate measuring device for internal combustion engine
US4132211A (en) * 1975-10-24 1979-01-02 Robert Bosch Gmbh Fuel injection system
US4516552A (en) * 1982-10-30 1985-05-14 Dr. Ing. H.C.F. Porsche Ag Air quality measuring device for a fuel injection installation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1294182A (en) * 1916-05-27 1919-02-11 Louis T Severson Carbureter.
US2318216A (en) * 1942-04-21 1943-05-04 Phillips Petroleum Co Variable fuel orifice carburetor
US2591356A (en) * 1950-05-24 1952-04-01 Jr William L Howe Carbureting mechanism
US3288445A (en) * 1963-06-08 1966-11-29 Sibe Carburetting devices for internal combustion engines
GB1191206A (en) * 1967-05-30 1970-05-13 Sibe Improvements in carburettors for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1294182A (en) * 1916-05-27 1919-02-11 Louis T Severson Carbureter.
US2318216A (en) * 1942-04-21 1943-05-04 Phillips Petroleum Co Variable fuel orifice carburetor
US2591356A (en) * 1950-05-24 1952-04-01 Jr William L Howe Carbureting mechanism
US3288445A (en) * 1963-06-08 1966-11-29 Sibe Carburetting devices for internal combustion engines
GB1191206A (en) * 1967-05-30 1970-05-13 Sibe Improvements in carburettors for internal combustion engines

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777725A (en) * 1970-04-24 1973-12-11 Bosch Gmbh Robert Means for varying the air-fuel ratio in a fuel injection system for internal combustion engines
US3916842A (en) * 1970-10-21 1975-11-04 Bosch Gmbh Robert Fuel injection apparatus for internal combustion engines
US3739758A (en) * 1970-11-07 1973-06-19 Bosch Gmbh Robert Regulator mechanism for fuel injection apparatus
US3728993A (en) * 1970-12-17 1973-04-24 Bosch Gmbh Robert Fuel injection apparatus including an air sensor and means for the direction-dependent damping of its movement
US3854462A (en) * 1971-10-14 1974-12-17 Porsche Kg Mixture preparation installation for a multi-cylinder injection internal combustion engine
US3930479A (en) * 1972-09-07 1976-01-06 Robert Bosch G.M.B.H. Fuel metering device for externally ignited internal combustion engines with compression of the air-fuel mixture
US4043304A (en) * 1973-05-02 1977-08-23 Robert Bosch Gmbh Fuel injection system for self-igniting internal combustion engines
US3951119A (en) * 1973-06-09 1976-04-20 Robert Bosch G.M.B.H. Fuel injection system
US3998614A (en) * 1973-09-12 1976-12-21 General Motors Corporation Internal combustion engine air induction assembly
US3915138A (en) * 1973-09-22 1975-10-28 Bosch Gmbh Robert Fuel injection system
US3919992A (en) * 1973-09-28 1975-11-18 Bosch Gmbh Robert Fuel injection system
US3931803A (en) * 1974-01-18 1976-01-13 Asoke Chattopadhayay Fuel quantity manifold for multi-cylinder internal combustion engines
US4026259A (en) * 1974-09-19 1977-05-31 Volkswagenwerk Aktiengesellschaft Fuel injection device for mixture-condensing, spark-ignited internal combustion engines
US4058100A (en) * 1975-03-14 1977-11-15 Nippon Soken, Inc. Intake air flow rate measuring device for internal combustion engine
US4040405A (en) * 1975-06-10 1977-08-09 Nippon Soken, Inc. Fuel injection system for internal combustion engine
US4132211A (en) * 1975-10-24 1979-01-02 Robert Bosch Gmbh Fuel injection system
US4516552A (en) * 1982-10-30 1985-05-14 Dr. Ing. H.C.F. Porsche Ag Air quality measuring device for a fuel injection installation

Also Published As

Publication number Publication date
JPS5323450B1 (de) 1978-07-14
AT307807B (de) 1973-06-12
FR2072633A5 (de) 1971-09-24
SE360427B (de) 1973-09-24
GB1336604A (en) 1973-11-07
ES386029A1 (es) 1973-02-16

Similar Documents

Publication Publication Date Title
US3628515A (en) Measuring device for a fuel injection system
US3680535A (en) Fuel injection system for combustion engines
US2341257A (en) Fuel feeding device for internal combustion engines
US4015571A (en) Fuel-air mixture controller for internal combustion engines
US3791359A (en) Fuel injection apparatus for externally ignited internal combustion engines operating on continuously injected fuel
US2876758A (en) Starter controlled priming system for a fuel injection operated internal combustion engine
US3288445A (en) Carburetting devices for internal combustion engines
US3613650A (en) Fuel injection system for internal combustion engines
US3930481A (en) Fuel injection system for internal combustion engines
JPS6111469Y2 (de)
JPS5812470B2 (ja) ネンリヨウフンシヤソウチ
US3929114A (en) Fuel injector arrangement for compressive mixture internal combustion engines
US2440567A (en) Fuel supply system for internal-combustion engines
US2318216A (en) Variable fuel orifice carburetor
US3713430A (en) Fuel injection system
US3811419A (en) Control device for a fuel injection system
SU634688A3 (ru) Система впрыска топлива дл двигател внутреннего сгорани
US3817229A (en) Fuel injection apparatus for externally ignited internal combustion engines operating on fuel continuously injected into the suction tube
US2957467A (en) Fuel metering system
US3915138A (en) Fuel injection system
US4200074A (en) Fuel injection system for an internal combustion engine
US3967607A (en) Fuel injection system
US2995125A (en) Fuel metering systems
US5359977A (en) Fluidic metering system
US2893711A (en) Charge forming means