US3710769A - Fuel injection system for internal combustion engines - Google Patents

Fuel injection system for internal combustion engines Download PDF

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Publication number
US3710769A
US3710769A US00107631A US3710769DA US3710769A US 3710769 A US3710769 A US 3710769A US 00107631 A US00107631 A US 00107631A US 3710769D A US3710769D A US 3710769DA US 3710769 A US3710769 A US 3710769A
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US
United States
Prior art keywords
air sensor
valve
air
sensor
inlet conduit
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
US00107631A
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English (en)
Inventor
H Knapp
R Schwartz
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
Priority claimed from DE19702002444 external-priority patent/DE2002444C3/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3710769A publication Critical patent/US3710769A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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

Definitions

  • This invention relates to a fuel injection system for an externally ignited internal combustion engine wherein fuel is continuously injected in the inlet conduit, in which an air sensor and an arbitrarily controllable throttle valve are installed.
  • the air sensor is disair by means of the pressure differentialbetween the air pressure upstream and downstream of the air sensor.
  • This displacement of the sensor is opposed by a preferably constant restoring force.
  • the sensor in proportion to its displacement, actuates a fuel metering valve. In this manner, a constant ratio between the amount of air and the amount of fuel introduced into the inlet conduit downstream of the air sensor can be maintained.
  • the purpose of fuel injection systems of the aforenoted type is to ensure that a favorable air fuel ratio is achieved automatically for a spark-ignited engine under all performance conditions. In this manner the fuel combustion is as complete as possible resulting in a superior engine efficiency and further, the formation of poisonous discharge gases is avoided or at least decreased to a permissible value to achieve this, the fuel amount must be metered very accurately for all possible performance conditions. It is necessary that the aforenoted proportionality between the air amount and the fuel amount be maintained substantially undisturbed, but be variable as a function of such engine parameters as load, r.p.m. and temperature (the so-called A-adjustment).
  • the restoring force exerted on the air sensor is generated by a spring, the bias of which is variable as a function of the engine temperature (an engine parameter).
  • OBJECT AND SUMMARY OF THE INVENTION placed, in proportion to the throughgoing flow rate of It is an object of the invention to provide an imsensor are connectable to one another by a valve which is opened, when its closing force is overcome. This occurs when the pressure differential across the air sensor exceeds the value required to move theair sensor. By virtue of said connecting valve, the unfavorabie'initial thrusts are either eliminated or substantially reduced.
  • FIG. 1 is a sectional, partially schematic view of a fuel injection system incorporating a first embodimentof the invention
  • FIG. 2 is a sectional view of a second embodiment of the invention.
  • FIG. 3 is a sectional view of a third embodiment of the invention.
  • FIG. 4 is a sectional view of a fourth embodiment of the invention.
  • the combustion air flows in the fuel injection system through a filter 1 in the direction indicated by the arrows and passes through an inlet conduit portion 3 in which an air sensing device 4 is installed. Thereafter, the air passes through a coupling hose 5 and through an inlet conduit portion 6, provided with an arbitrarily controllable throttle valve 7.
  • the sensor 4 moves in the inlet conduit portion 3 as an approximately linear function of the How rate of air passing through the inlet conduit.
  • the sensor '4 is formed as a plate arranged normal to the direction of the air flow. It is tiltable about a pin 9 against the force of a restoring spring 8. The pin 9 is fastened to a lever 10 to which movements of the sensor 4 are transmitted.
  • Lever 10 is pivotally supported with low friction on a shaft 11 and, upon its displacement, actuates with its nose 12, a movable valve part 13 of a fuel metering and distributing valve 14.
  • the restoring force is provided by a spring 15 which has a very flat performance characteristic, so that when the sensor 4 is displaced and, accordingly, the spring 15 is compressed, its return force remains approximately constant irrespective of the extent of compression.
  • the position of rest of the lever 10 is adjustable by a set screw 16.
  • the fuel is supplied by a feed'pump 18, driven by an electric motor 19.
  • the fuel is drawn by pump 18 from a tank 20 and forcedthrough a fuel line 21 to the fuel metering valve 14.
  • a return conduit 22 is branched off from the fuel line 21 and contains a pressure limiting or.
  • the fuel which is metered by the metering valve 14 flows from ports 24 to individual injection valves, which generally are installed in the inlet conduit in the proximity of the corresponding engine cylinders.
  • Filter housing 1 and inlet conduit portion 3 are builtas a structural unit in such a manner that the intake air drawn by the engine, immediately upon passing I through filter 2, impinges on the surface of sensor plate 4 which maintains the inlet conduit closed when the engine is not running. Said surface may be considerably larger than the surface of throttle valve 7; the working capacity of sensor plate 4 will then be large. Since filter 2 should have a relatively large diameter in any case,
  • the butterfly valve 7, can be relatively small to take up as little space as possible.
  • the spring 8 is so adjusted that as soon as the pressure differential across sensor 4 exceeds the pressure differential, that is sufficient to actuate the sensor 4 against the force of spring 15, the sensor plate 4 is tilted around pin 9 against the force of spring 8.
  • An aforenoted excess of pressure difference occurs as a result of sudden pressure thrusts when upon depressing the accelerator ad upon corresponding opening of the butterfly valve during idling or coasting in gear the volume of the inlet conduit has to be charged from a low pressure to a high pressure by the air flowing at an increased rate.
  • FIG. 2 illustrates another embodiment of the invention.
  • the sensor 4a is fixedly (i.e., nontiltably) fastened to lever 10.
  • the inlet conduit portion 3 is provided with a bypass 25 which interconnects inlet conduit portions upstream and downstream of the sensor 4a and which is closed by a check valve 26 loaded with a spring 27.
  • the force of the latter is so adjusted with respect to spring 15 that when the pressure differential across sensor 4a is larger than the pressure differential that is sufficient to actuate the sensor 4a against the force of spring 15, the check valve 26 is unseated by'theintake air pressure, overcoming the forcerof the spring 27.
  • the bypass 25 is opened.
  • the bias or preload of spring27 is variable by a temperature sensitive member 40. In this manner, for example, the bias or preload of the spring of the air fuel ratio is expedited. which is desirable for this engine' condition. In any event, however, the said overswing always remains sufficiently small so as not to cause adverse effects.
  • FIG. 3 illustrates a structurally particularly simple embodiment of the invention.
  • the sensor 4b is rigidly affixed to the lever 10.
  • the overpressure valve means is formed of a check valve 30, which is biased by means of a spring 29 and which controls an orifice 28 in the sensor 4b.
  • the force of spring 29 is so adjusted with respect to spring 15 that when the pressure differential upstream and downstream of sensor 4b is larger than'the pressure differential that is sufficient to actuate the sensor 4b against the force of spring 15, the check valve 30 is unseated by the intake air pressure, overcoming the force of the spring 29.
  • the orifice 28 is'opened.
  • the embodiment of the invention illustrated in FIG. 4 includes a. sensor 40, movable linearly along the axis of the inlet conduit.
  • sensor 40 is attached to one end of a guide rod 32 which is supported axially displaceably in a sleeve 33 which, in turn, is held fixedly in, and coaxially with the inlet conduit.
  • a coupling element 34 provided with a circumferential annular groove 35.
  • In the inlet conduit there is rotatably held a shaft 36, the axis of which crosses over perpendicularly that of the inlet conduit.
  • a fuel injection system for an internal combustion engine having an inlet conduit for the intake of air, said system being of the known type that includes ferential formed of the difference between the pressures prevailing in said inlet conduit upstream and downstream of saidair sensor, (e) a fuel metering a valve, the position of which is dependent upon the extentof displacement of said air sensor and (d) means operatively connecting said air sensor to said fuel me tering valve, the improvement comprising A. passage means interconnecting a location in, said inlet conduit upstream of said air sensor with a losensor,
  • valve means disposed insaidipassage means to control the flow passage section thereof and C. bias means for urging said valve means into 'a closed position obstructing said passage means; the force of said bias means being so designed that said valve means being openable against said bias means by said pressure difference whenreaching'a predetermined value over the value necessary to displace said air sensoragainst the force of said constant resetting means.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
US00107631A 1970-01-21 1971-01-19 Fuel injection system for internal combustion engines Expired - Lifetime US3710769A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702002444 DE2002444C3 (de) 1970-01-21 Kraftstoffeinspritzanlage fur gemischverdichtende fremdgezundete Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3710769A true US3710769A (en) 1973-01-16

Family

ID=5760086

Family Applications (1)

Application Number Title Priority Date Filing Date
US00107631A Expired - Lifetime US3710769A (en) 1970-01-21 1971-01-19 Fuel injection system for internal combustion engines

Country Status (14)

Country Link
US (1) US3710769A (cs)
JP (1) JPS50220B1 (cs)
AT (1) AT307810B (cs)
BE (1) BE761816A (cs)
BR (1) BR7100326D0 (cs)
CH (1) CH515415A (cs)
CS (1) CS151071B2 (cs)
ES (1) ES387455A1 (cs)
FR (1) FR2075708A5 (cs)
GB (1) GB1335733A (cs)
NL (1) NL7100758A (cs)
PL (1) PL81428B1 (cs)
SE (1) SE356335B (cs)
SU (2) SU453849A3 (cs)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777727A (en) * 1971-08-02 1973-12-11 Kugelfischer G Schaefer & Co Fuel feed regulating device
US3796200A (en) * 1972-01-26 1974-03-12 Heinrich Knapp Fuel injection apparatus
US3817229A (en) * 1971-05-18 1974-06-18 Bosch Gmbh Robert Fuel injection apparatus for externally ignited internal combustion engines operating on fuel continuously injected into the suction tube
US3880125A (en) * 1972-09-21 1975-04-29 Bosch Gmbh Robert Fuel injection system for internal combustion engine
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
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
US5669350A (en) * 1993-09-02 1997-09-23 Filterwerk Mann & Hummel Gmbh Throttle device

Citations (4)

* 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.
US1918751A (en) * 1932-03-25 1933-07-18 Champion Carburetor Carburetor
US1955204A (en) * 1930-10-29 1934-04-17 Sawyer Le Roy Carburetor choke
US3613650A (en) * 1968-12-14 1971-10-19 Bosch Gmbh Robert Fuel injection system for internal combustion engines

Patent Citations (4)

* 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.
US1955204A (en) * 1930-10-29 1934-04-17 Sawyer Le Roy Carburetor choke
US1918751A (en) * 1932-03-25 1933-07-18 Champion Carburetor Carburetor
US3613650A (en) * 1968-12-14 1971-10-19 Bosch Gmbh Robert Fuel injection system for internal combustion engines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3817229A (en) * 1971-05-18 1974-06-18 Bosch Gmbh Robert Fuel injection apparatus for externally ignited internal combustion engines operating on fuel continuously injected into the suction tube
US3777727A (en) * 1971-08-02 1973-12-11 Kugelfischer G Schaefer & Co Fuel feed regulating device
US3796200A (en) * 1972-01-26 1974-03-12 Heinrich Knapp Fuel injection apparatus
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
US3880125A (en) * 1972-09-21 1975-04-29 Bosch Gmbh Robert Fuel injection system for internal combustion engine
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
US5669350A (en) * 1993-09-02 1997-09-23 Filterwerk Mann & Hummel Gmbh Throttle device

Also Published As

Publication number Publication date
BR7100326D0 (pt) 1973-05-31
SU520931A3 (ru) 1976-07-05
CH515415A (de) 1971-11-15
ES387455A1 (es) 1973-05-16
SE356335B (cs) 1973-05-21
JPS50220B1 (cs) 1975-01-07
DE2002444A1 (de) 1971-07-29
BE761816A (fr) 1971-07-01
NL7100758A (cs) 1971-07-23
PL81428B1 (cs) 1975-08-30
CS151071B2 (cs) 1973-09-17
DE2002444B2 (de) 1976-11-25
FR2075708A5 (cs) 1971-10-08
AT307810B (de) 1973-06-12
GB1335733A (cs) 1973-10-31
SU453849A3 (ru) 1974-12-15

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