US3777725A - Means for varying the air-fuel ratio in a fuel injection system for internal combustion engines - Google Patents

Means for varying the air-fuel ratio in a fuel injection system for internal combustion engines Download PDF

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Publication number
US3777725A
US3777725A US00136975A US3777725DA US3777725A US 3777725 A US3777725 A US 3777725A US 00136975 A US00136975 A US 00136975A US 3777725D A US3777725D A US 3777725DA US 3777725 A US3777725 A US 3777725A
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US
United States
Prior art keywords
bypass
improvement
sensor
suction tube
valve member
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
US00136975A
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English (en)
Inventor
G Stumpp
G Schuster
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.)
NORDICK INDUSTRIES Inc A CORP OF WI
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Priority claimed from DE19702019886 external-priority patent/DE2019886C/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US3777725A publication Critical patent/US3777725A/en
Assigned to NORDICK INDUSTRIES, INC., A CORP. OF WI. reassignment NORDICK INDUSTRIES, INC., A CORP. OF WI. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SHELSTAD, RICHARD J.
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
    • F02M69/28—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for cutting-out the fuel supply to the engine or to main injectors during certain operating periods, e.g. deceleration
    • 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
    • F02M69/30—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for facilitating the starting-up or idling of engines or by means for enriching fuel charge, e.g. below operational temperatures or upon high power demand of engines
    • F02M69/32—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for facilitating the starting-up or idling of engines or by means for enriching fuel charge, e.g. below operational temperatures or upon high power demand of engines with an air by-pass around the air throttle valve or with an auxiliary air passage, e.g. with a variably controlled valve therein
    • 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

  • the sensor is moved, in proportion to the flow rate of air, by the difference of the air pressure prevailing upstream and downstream of the sensor.
  • the sensor is deflected by the differential pressure against a constant returning force and, as a function of its deflection, operates a fuel metering valve. In this manner, between the quantity of air and metered fuel there is maintained a certain proportionality which is variable by changing said pressure difference by directing pa'rt'of the intake air through a bypass which circumvents the sensor and which is provided with means for altering its flow passage section.
  • a fuel injection system of the outlined type is'to automatically provide in Otto-engines under 1 all operational conditions anair-fuel mixture which ensures an as perfect a combustion of the fuel as possible.
  • the air-fuel ratio may be changed during idling by circumventing the sensor by a bypass, the flow passage section of which may be preset by means of a manually adjustable screw.
  • a bypass the flow passage section of which may be preset by means of a manually adjustable screw.
  • FIG; 1 is a schematic sectional view of afuelinjection system taken axially along the'suction'tub'e and incorporating a first embodiment of the invention
  • FIG. 2 is a sectional view along Il-ll of FIG. 1;
  • FIG. 3 is a sectional view taken'axially along the suction tube and illustrating a second embodiment of the invention
  • FIG. 4 is a sectional view along line lV-lV of FIG. 3;
  • FIG. Si is a sectional view taken axially along the suction tube and illustrating a third embodime ntof the invention.
  • FIG. 6 is a sectional FIG. 5.
  • the intake air flows through an air'filte'r 2 disposed in a housing 1, a suction tubeportion 3 associated with a sensor 4 which moves in a cone-shaped range 5 of the tube portion 3 and through a suction tube portion 6 in which there is disposed an arbitrarily operable butterfly valve 7.
  • the sensor '4 moves'in the conical range 5 of the suction tube portion 3 as an apview taken along line VI-Vl of proximately linear function of the air quantity flowing through the suction tube.
  • the sensor 4 is formed as a plate disposed transversely to the flow direction of "the air.
  • the sensor plate 4 is affixed to a lever'9 to which the displacements of sensor plate 4 are transmitted.
  • the lever 9 is held withlow friction on a pin 10 and actuates, as a result of its swinging motion, with a lug 13 a movable valve piston 14 which forms part of a fuel metering and distributing valve 15.
  • fuel under pressure is admitted from a conduit 21 through a branch conduit 21a to the fuel metering valve where it exerts an outwardly directed force to the piston 14. In this manner, the returning force associated with the sensor 4 remains substantially the same regardless of the extent of deflection.
  • the position of rest of the lever 9 is determining by a setting screw 16.
  • the metering valve 15 is supplied with fuel by a transfer pump 18 which is driven by an electromotor 19 and which draws fuel from a fuel tank 20 through the conduit 21 and advances it to the fuel metering valve 15.
  • the filter housing 1 and the suction tube portion 3 form an integral structure, so that the air drawn by the engine, after passing through the filter 2, directly impinges upon the surface of the plate 4 which, when the engine is at standstill, closes the inlet of the suction tube.
  • the surface of the sensor plate 4 is expediently substantially larger than the butterfly valve 7 and accordingly, its work capacity is relatively large. In this manner, the sensor 4 is responsive even to small differences of pressure upstream and downstream thereof. Since, in any event, the filter 2 and thus its housing 1 requires a relatively large diameter, the large dimensions of the plate 4 do not necessitate the provision of additional space.
  • the butterfly valve 7, on the other hand, may have relatively small dimensions to take up as little space as possible.
  • a bypass 26 which communicates with the suction tube through an opening 27 disposed upstream of the butterfly valve 7.
  • the intake air which in its entirety flows through the butterfly valve 7, may pass in part through the bypass 26 and in part through the sensor 4.
  • the fuel part of the airfuel ratio may be varied. This variation, according to the invention, is effected as a function of at least one engine variable.
  • the control of the flow passage section of bypass 26 depends upon the position of the butterfly valve 7.
  • a plate-like, valve member 28 which is keyed normal to the shaft of the butterfly valve 7 and is movable therewith in unison.
  • the valve member 28 covers the opening 27 between the bypass channel 26 and the suction tube to a greater or lesser extent, dependent upon the angular position of the butterfly valve 7.
  • the more the butterfly valve 7 opens the greater will be the overlap between the valve member 28 and the opening 27 and thus the smaller will be the proportion of the intake air flowing through the bypass 26.
  • FIGS. 3 and 4 there is shown a second embodiment in which too, the control of the flow passage section of the bypass is effected as a function of the position of the butterfly valve.
  • the butterfly valve shaft carries a valve member 28 which has a considerably greater thickness than that of valve member 28 of the first embodiment and which is provided with a contour edge face 31.
  • the valve member 28 is disposed in a chamber 33, one wall of which contains a terminal opening 32 of the bypass 26 and another wall of which contains the opening 27.
  • the valve member 28 is so arranged that, by virtue of its angular position, it controls, with the edge face 31, the flow passage section of the opening 32.
  • the bypass 26 also communicates with chamber 33 by means of a channel 34, the flow passage section of which is variable by means of a setting screw 35.
  • the purpose of this arrangement is to determine, by means of setting screw 35, an intake air quantity which is favorable for idling conditions and which flows continuously through bypass 26.
  • the outline of the opening 32 may be rectangular in which case a particularly advantageous control may be achieved.
  • FIGS. 5 and 6 A third embodiment of the invention is depicted in FIGS. 5 and 6.
  • the control of the flow passage section of bypass 26 is effected as a function of load and temperature conditions.
  • a rotary valve member 37 which is turned as a unit with the butterfly valve 7 with the aid of a driving pin 38 which permits an axial displacement of the valve member 37.
  • the driving pin 38 supports one terminus of a spring 39.
  • the rotary valve member 37 is linearly displaceable against the force of spring 39 by means of a temperature responsive control member 40 which exerts an axially directed force on the shaft of the butterfly valve 7.
  • the chamber 43 communicates with the suction tube through the opening 27.
  • the outlines of the openings 41 and 42 have a wedgelike configuration so that dependent upon the angular or axial position of the valve member 37, the magnitude of the overlap between openings 41 and 42 varies. For example, as the temperature increases, the rotary valve member 37 is displaced in the direction of the butterfly valve 7 against the force of the spring 39 whereby the area overlap between the openings 41 and 42 is enlarged. Consequently, more air may pass through the bypass 26 whereby a leaner air-fuel mixture is obtained.
  • the temperature responsive control member 40 projects into a space 44 which may form part, for example, of the coolant conduit system of the engine.
  • the axial displacement of the control member 37 may be effected in lieu of the temperature responsive control member 40 or in addition thereto as a function of the pressure prevailing in the suction tube downstream of the butterfly 'valve 7 or it maybe axially displaced by rpm-responsive hydraulic means. In this manner the displacement of the valve member 37 is also a function of the engine rpm.
  • a chamber 47 which communicates with the chamber 43 through an opening 46 and with the suction tube through an opening 48.
  • The'latter is situated downstream of the butterfly valve 7.
  • the opening 46 is controlled-by the lateral face' pressure prevailing in the space 43.
  • a bore 51 for this purpose there is provided a bore 51.
  • connection 46, 47, 48 may serve as an idling channel: the intake air may flow through the opening 27, the space 43 and the connection 46, 47, 48 without being controlled by the butterfly valve 7 while the sensor 4 undergoes a deflection which corresponds to the idling operation.
  • connection 46, 47, 48 is'closed in this particular instance.
  • the initial position of the piston 49 may be varied in such a manner that the thus determined remaining flow passage section of the opening 46 affects th'e'fuel-air ratio in a desired manner.
  • an equivalent membrane control may be provided in association with the connection 46, 47, 48.
  • a fuel injection system associated with a sparkignited internal combustion engine and being of the known type that includes (a) an'arbitrarily operable butterfly valve disposed in the suction tube of said engine to vary the quantities of intake air drawn by said engine through said suction tube, (b) a fuel metering pump, a sensor disposed in said suction tube at a distance from said butterfly valve, said sensor is deflected against a return force in proportion to said quantities of intake air by the difference of the pressures upstream and downstream of said sensor, (d) means for connnecting said sensor to said fuel injection pump to control the metering of fuel as a function of the deflection of said sensor and to determine an airfuel ratio, (e) a bypass circumventing said sensor and adapted to take out intake air from said suction tube upstream of said sensor and to reintroduce the same into said suction tube downstream of said sensor and (f) means for controlling the flow passage section of 6 said bypass to change the quantities of intake air passing through said sensor and thus vary the air-
  • valve member is formed of a plate-like component rotatable about an axis normal thereto for varying the flow passage section of said'bypass.
  • D means for displacing said valve member along said axis and associated with a second engine variable; said flow passage section is varied by virtue of the rotary and linear motion of said valve member.
  • control means is formed as a piston displaceable in response to the pressure in said suction tube downstream of said butterfly valve.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
US00136975A 1970-04-24 1971-04-23 Means for varying the air-fuel ratio in a fuel injection system for internal combustion engines Expired - Lifetime US3777725A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702019886 DE2019886C (de) 1970-04-24 Steuerung einer Kraftstoffeinspritzanlage für gemischverdichtende fremdgezündete Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3777725A true US3777725A (en) 1973-12-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00136975A Expired - Lifetime US3777725A (en) 1970-04-24 1971-04-23 Means for varying the air-fuel ratio in a fuel injection system for internal combustion engines

Country Status (14)

Country Link
US (1) US3777725A (de)
JP (1) JPS50219B1 (de)
AT (1) AT309901B (de)
BE (1) BE766240A (de)
BR (1) BR7100566D0 (de)
CH (1) CH535375A (de)
CS (1) CS149446B2 (de)
ES (1) ES390531A1 (de)
FR (1) FR2090644A5 (de)
GB (1) GB1340934A (de)
NL (1) NL7105556A (de)
PL (1) PL81611B1 (de)
SE (1) SE365568B (de)
SU (1) SU455553A3 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3927649A (en) * 1972-08-25 1975-12-23 Bosch Gmbh Robert Fuel-metering unit for internal combustion engines
US3951119A (en) * 1973-06-09 1976-04-20 Robert Bosch G.M.B.H. Fuel injection system
US4031873A (en) * 1975-07-10 1977-06-28 Robert Bosch G.M.B.H. Fuel injection system for internal combustion engines having controlled exhaust gas recycling
US4064847A (en) * 1975-10-17 1977-12-27 Robert Bosch Gmbh Fuel injection system for internal combustion engines
US4064843A (en) * 1975-09-30 1977-12-27 Robert Bosch Gmbh Fuel metering and injection system for internal combustion engines
US4195659A (en) * 1976-09-21 1980-04-01 Robert Bosch Gmbh Tension control for a valve
US5669350A (en) * 1993-09-02 1997-09-23 Filterwerk Mann & Hummel Gmbh Throttle device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2538921C3 (de) * 1975-09-02 1979-03-29 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Brennkraftmaschine mit einer am in der Ansaugleitung angeordneten Leistungsregelorgan vorbeigeführten Umgehungsleitung für Ansaugluft
DE2625141A1 (de) * 1976-06-04 1977-12-22 Bosch Gmbh Robert Unterdruckbegrenzer fuer eine kraftstoffeinspritzanlage
DE2704456A1 (de) * 1977-02-03 1978-08-10 Porsche Ag Brennkraftmaschine mit einer an dem leistungsregelorgan der brennkraftmaschine vorbeigefuehrten umgehungsleitung
DE2730386A1 (de) * 1977-07-06 1979-01-18 Audi Nsu Auto Union Ag Kraftstoff-einspritzanlage fuer fahrzeug-brennkraftmaschinen
DE602007001129D1 (de) * 2007-03-09 2009-06-25 Magneti Marelli Spa Ventil zur Steuerung des Luftdurchsatzes in einer Brennkraftmaschine
DE102008041384A1 (de) * 2008-08-20 2010-02-25 Robert Bosch Gmbh Vorrichtung zur Versorgung einer Verbrennungskraftmaschine mit Treibstoff

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128079A (en) * 1935-10-25 1938-08-23 Bailey P Dawes Carburetor
US3460814A (en) * 1966-08-12 1969-08-12 Zenith Carburetter Co Ltd Fuel-air mixture intake systems for internal combustion engines
US3613650A (en) * 1968-12-14 1971-10-19 Bosch Gmbh Robert Fuel injection system for internal combustion engines
US3628515A (en) * 1969-12-01 1971-12-21 Bosch Gmbh Robert Measuring device for a fuel injection system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128079A (en) * 1935-10-25 1938-08-23 Bailey P Dawes Carburetor
US3460814A (en) * 1966-08-12 1969-08-12 Zenith Carburetter Co Ltd Fuel-air mixture intake systems for internal combustion engines
US3613650A (en) * 1968-12-14 1971-10-19 Bosch Gmbh Robert Fuel injection system for internal combustion engines
US3628515A (en) * 1969-12-01 1971-12-21 Bosch Gmbh Robert Measuring device for a fuel injection system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927649A (en) * 1972-08-25 1975-12-23 Bosch Gmbh Robert Fuel-metering unit for internal combustion engines
US3951119A (en) * 1973-06-09 1976-04-20 Robert Bosch G.M.B.H. Fuel injection system
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
US4031873A (en) * 1975-07-10 1977-06-28 Robert Bosch G.M.B.H. Fuel injection system for internal combustion engines having controlled exhaust gas recycling
US4064843A (en) * 1975-09-30 1977-12-27 Robert Bosch Gmbh Fuel metering and injection system for internal combustion engines
US4064847A (en) * 1975-10-17 1977-12-27 Robert Bosch Gmbh Fuel injection system for internal combustion engines
US4195659A (en) * 1976-09-21 1980-04-01 Robert Bosch Gmbh Tension control for a valve
US5669350A (en) * 1993-09-02 1997-09-23 Filterwerk Mann & Hummel Gmbh Throttle device

Also Published As

Publication number Publication date
GB1340934A (en) 1973-12-19
BR7100566D0 (pt) 1973-05-31
SU455553A3 (ru) 1974-12-30
FR2090644A5 (de) 1972-01-14
SE365568B (de) 1974-03-25
JPS50219B1 (de) 1975-01-07
CS149446B2 (de) 1973-07-05
ES390531A1 (es) 1973-06-16
PL81611B1 (de) 1975-08-30
AT309901B (de) 1973-09-10
CH535375A (de) 1973-03-31
NL7105556A (de) 1971-10-26
DE2019886B2 (de) 1972-03-02
BE766240A (fr) 1971-09-16
DE2019886A1 (de) 1971-11-11

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Legal Events

Date Code Title Description
AS Assignment

Owner name: NORDICK INDUSTRIES, INC., A CORP. OF WI.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SHELSTAD, RICHARD J.;REEL/FRAME:004456/0068

Effective date: 19850506