US3616780A - Electrically controlled fuel injection arrangement for internal combustion engines - Google Patents

Electrically controlled fuel injection arrangement for internal combustion engines Download PDF

Info

Publication number
US3616780A
US3616780A US861280A US86128069A US3616780A US 3616780 A US3616780 A US 3616780A US 861280 A US861280 A US 861280A US 86128069 A US86128069 A US 86128069A US 3616780 A US3616780 A US 3616780A
Authority
US
United States
Prior art keywords
throttle
lever
cam
fuel injection
internal combustion
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
US861280A
Other languages
English (en)
Inventor
Hans Joachim Helle
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 US3616780A publication Critical patent/US3616780A/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/02—Fuel-injection apparatus characterised by being operated electrically specially for low-pressure fuel-injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection

Definitions

  • the present invention resides in an electrically controlled fuel injection arrangement for internal combustion engines, in which at least one electromagnetically actuated injection valve is provided with a magnetization coil energized from a power transistor connected in series therewith.
  • a control multivibrator futhermore, is connected in series with the power transistor and becomes actuated or switched to its unstable state, through pulses emitted synchronously with the rotational speed of the engine.
  • the pulses emitted by the control multivibrator provide for opening of the injection valves. After a variable opening duration of the valve determined by the time interval of the multivibrator, the latter returns to its stable state.
  • the throttle flap of the engine is, moreover, operated in conjunction with a switching arrangement for providing additional or auxiliary injection processes during the opening motion of the throttle flap and between two pulses occurring synchronously with the rotational speed of the engine.
  • a throttle flap of the engine is coupled to a pulse generator which include an induction coil into which a permanent magnet dips or is insertable.
  • the permanent magnet When the gas pedal is stepped upon, the permanent magnet is inserted into the induction coil and induces, thereby, a voltage into the coil. The magnitude of this voltage increases with the opening speed or velocity of the throttle flap.
  • this induced voltage is applied to a transistor amplifier through which the reference voltage of the control multivibrator determining the length of the output pulse or duration of this pulse and thereby its resetting instant, may be varied.
  • the control pulse is extended in duration, and the increased fuel quantity injected by the injection valves over this extended period of time, serve for accelerating purposes through accelerating enrichment.
  • the circuit arrangement of the present invention is to be connectable to the throttle .fiap shaft, so that no time delay is encountered with respect to the throttle motion.
  • the fuel enrichment is to be made dependent upon the opening path or motion of the throttle, and the opening speed thereof. It is to be made certain, thereby, that the circuitry be made operable only during the Opening motion and not during the closing motion of the throttle.
  • the circuitry includes a rotatable cam having a plurality of sprocket-shaped teeth used for switching purposes.
  • a free-running coupling is provided between the cam and the shaft of the throttle flap. The free-running coupling is arranged so that it will provide coupling action in the opening direction of the throttle shaft.
  • the circuitry can be advantageously designed when the free-running coupling is concentrically arranged with the cam, and is situated within an interior space of the cam.
  • the free-runing coupling furthermore, has a hub member which may be slipped onto the throttle shaft and a clamping roller, furthermore, resides between the circumferential surface of the hub member and the interior wall of the cam.
  • the clamping roller lies, preferably, within a pocket-shaped portion of the hub member.
  • a lever furthermore, cooperates with the sprocketshaped teeth on the circumference of the cam, and actuates switching contacts which consist, preferably, of at least two switching contacts on leaf springs. It is particularly advantageous when the lever is subjected to forced motion in relation to the cam peripheral area.
  • the lever can be designed, for this purpose, with two arms and having an end zone at each arm resting against the peripheral surface of the cam.
  • the lever has side walls extending backwards along both of its longitudinal rims. These side walls have transverse slots for mounting the lever upon a pin serving as a bearing member.
  • a leaf spring may be advantageously inserted between these side walls and bent in shape so that it lies in the proximity of both end zones upon which the back side of the lever is in contact with the cam surface.
  • the spring supports itself with its mid dle zone against the bearing pin of the lever, and maintains, thereby, the lever in contact with the sprocket teeth of the cam surface, through its tension. In this manner, an elastic three-point support for the lever may be realized, and forced motion of the lever is obtained for assuring actuation of the switching contacts, as required.
  • a controlled fuel injection arrangement in which fuel is injected into the engine through the use of electromagnetically actuated injection valves.
  • the control pulses for opening the valves are derived from a monostable multivibrator having a variable time interval corresponding to the unstable state of the multivibrator.
  • the multivibrator is actuated synchronously with the rotation of the engine, by being linked to the crank shaft thereof.
  • the output pulses of the multivibrator are amplified through a power transistor, and then applied to the coils of the electromagnetically actuated injection valves.
  • a switching arrangement is linked to the throttle of the engine and operated as a function of the position thereof, during the opening motion of the throttle, for applying auxiliary injection between each two successively occurring pulses from the multivibrator.
  • the switching arrangement also includes a cam member having sprocketshaped teeth about its circumference and rotatable through the throttle.
  • An overrunning slip clutch, or freewheeling clutch or coupling connects the cam member to the throttle so that the cam becomes rotated only during the opening motion of the throttle. During the closing motion of the throttle, the clutch slips and disengages the cam member from the throttle.
  • FIG. 1 is a partial sectional view of the intake manifold of the internal combustion engine and shows the mounting of the throttle flap upon a shaft projecting with its ends out of the intake manifold and having mounted thereon a throttle flap switch, in accordance with the present invention
  • FIG. 2 is a plan view along the axial direction of the throttle flap switch in FIG. 1, with parts broken away;
  • FIG. 3 is a sectional view taken along line IIIIII in FIG. 1;
  • FIG. 4 is a sectional view taken along line IVIV in FIG. 2;
  • FIG. 5 is an enlarged view of the portions in FIG. 2 within the area outlined by a dash-dot circle.
  • a throttle flap 2 mounted upon a rotatable shaft 3.
  • the throttle shaft 3 projects, with its ends, through the intake manifold.
  • One end of this shaft 3 projects through a bearing boss 4 out of the intake manifold 1, and carries a lever 6.
  • linkage 7 is coupled to the gas pedal of the internal combustion engine.
  • the throttle flap may be rotated to the position shown in the drawing, corresponding to the open position, against the action of a return spring.
  • the other end of the shaft 3 is provided with a flattened portion 8 which serves to transmit the rotational motion of the throttle to a hub member 9 of a throttle flap switch.
  • the throttle flap switch is comprised of a housing 10 made of plastics, for example, and is provided with two radially projecting mounting portions 11 and 12 having slots 13 for admitting mounting screws, not shown.
  • a ring cam 15 is mounted concentric with the hub 9 and rotatable relative thereto.
  • This ring cam 15 is shaped to have 48 teeth 16 about its circumference, the shape of which is clearly apparent from FIG. 5.
  • This ring cam 15 is made of hardened steel.
  • a shifting lever 17 designated with two arms, operates in conjunction with these teeth 16. The number of teeth is determined by the required number of injection pulses. This number of teeth can, moreover, be enlarged or made smaller through corresponding variation or modification in the lever 17.
  • a leaf spring 20 serves to apply the pressure or force for maintaining the lever 17 against the respective teeth 16.
  • the spring is inserted under severe tension between the ring cam 15 facing the backside of the lever 17, and a bearing pin 22 which forms the rotatable axis of the lever 17.
  • the bearing pin 22 is secured at the base of the housing 10, and reaches into a guide slot 24 in each one of two side walls 25 and 26'. These side Walls project from the ring cam 15 facing the backside of the lever 17.
  • Two fingers 28 and 29 are connected to the lever 17, and the finger 28, as shown in FIG. 5, reaches between two switching contacts of two switching arrangements.
  • Each of the switching arrangement consists of springs 35, 36 and 37, 38. Secured to these springs are, respectively, contact portions 31, 32, 33 and 34.
  • Each of the contact springs is conducti vely or electrically connected with one of the tongues 39 of a pin connector integrally formed with the housing, and not further shown.
  • a free-running coupling is provided between the hub member 9 and the ring cam 15.
  • This free-running coupling consists essentially of a clamping roller 40.
  • a pocket is provided in the rim zone of the hub member 9 facing the ring cam 15. This pocket is formed through a short and substantially radial wall portion 41, and a Wall 42 so as to form a tangential seating angle for the roller 40, with the wall 41.
  • the number of switching actuations carried out on the switching contacts or springs 35, 36 and 37, 38 are made to correspond to the magnitude of the open-motion of the throttle.
  • the clamping roller releases immediately the ring cam so that the latter remains stationary and the lever 17 does not carry out any rotations or oscillations.
  • the position of the ring cam 15 in relation to the clamping roller 40 and the hub member 9 is fixed through two ring-shaped discs 48 and 49 on both sides of the cam member. These ring discs are soldered to the hub member 9 with the aid of two pins 57 and the stem 50 of a switching pin 51.
  • This switching pin 51 projects from below the ring disc 49, and closes, in the idling state of the throttle flap 2, the two idling contacts 52 and 53 shown in FIG. 3.
  • a spring 55 is, furthermore, secured to the switching pin 51. This spring 55 presses against the flattened portion 8 through an elongated slot 56. With such pressure applied to the flattened portion 8, assurance is had that the hub member is positively carried along with the rotation of the throttle flap shaft.
  • the particular advantage of the embodiment of the present invention for the throttle flap switch resides in the feature that it may be produced economically and is simple in construction. At the same time, the operating life of this switching arrangement is extremely high. Furthermore, the throttle flap switch may be used for the other rotational direction by interchanging the idling contacts, the transfer contacts, and the reversing of the freerunning action of the clamping roll. Such reversal in rotation may be accomplished without any separate means. Since the rotational direction of the throttle flap opening depends upon the type of the internal combustion engine used, and is different for different engines, it is important to note whether right hand or left hand directions are under consideration.
  • a combination comprising an intake manifold of an internal combustion engine; a throttle in said manifold movable between open and closed positions; switching means fixed relative to said manifold and linked to said throttle to be operated by movement of the same in opening direction;
  • cam means in said switching means and rotatable by said throttle said cam means having a plurality of tooth shaped portions for operating said switch means through the link; and coupling means between said cam means and said throttle for engaging said cam means with said throttle during opening movement of said throttle and disengaging said cam means from said throttle during closing motion of said throttle.
  • said coupling means comprises a hub member linked to said throttle and movable therewith within an interior space of said cam means; and at least one clamping roller member between the circumferential surface of said hub member and the interior wall surface of said cam means.
  • lever means comprises a two-arm lever bearing against the circumferential surface of said cam means with the end portions of the two arms of said lever means.
  • said spring means comprises a leaf spring lying with its middle portion against said bearing pin means.

Landscapes

  • 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)
  • Valve Device For Special Equipments (AREA)
  • Fuel-Injection Apparatus (AREA)
US861280A 1968-09-28 1969-09-26 Electrically controlled fuel injection arrangement for internal combustion engines Expired - Lifetime US3616780A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1776155A DE1776155B2 (de) 1968-09-28 1968-09-28 Elektrisch gesteuerte Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3616780A true US3616780A (en) 1971-11-02

Family

ID=5702884

Family Applications (1)

Application Number Title Priority Date Filing Date
US861280A Expired - Lifetime US3616780A (en) 1968-09-28 1969-09-26 Electrically controlled fuel injection arrangement for internal combustion engines

Country Status (7)

Country Link
US (1) US3616780A (enrdf_load_stackoverflow)
AT (1) AT291681B (enrdf_load_stackoverflow)
CH (1) CH495502A (enrdf_load_stackoverflow)
DE (1) DE1776155B2 (enrdf_load_stackoverflow)
FR (1) FR2019128A1 (enrdf_load_stackoverflow)
GB (1) GB1290182A (enrdf_load_stackoverflow)
SE (1) SE341889B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804385A (en) * 1970-09-25 1974-04-16 Nippon Denso Co Spark ignition internal combustion engine
US3911872A (en) * 1972-05-13 1975-10-14 Lucas Electrical Co Ltd Fuel supply systems for internal combustion engines
US3926153A (en) * 1974-04-03 1975-12-16 Bendix Corp Closed throttle tip-in circuit
US3983850A (en) * 1974-01-24 1976-10-05 Robert Bosch G.M.B.H. Apparatus for supplying fuel for acceleration during the warm-up phase of an internal combustion engine
US4149494A (en) * 1975-10-07 1979-04-17 Robert Bosch Gmbh Air quantity metering apparatus
US4466412A (en) * 1979-11-08 1984-08-21 Outboard Marine Corporation Priming and acceleration fuel enrichment system for an internal combustion engine
US5756890A (en) * 1995-11-30 1998-05-26 Ford Global Technologies, Inc. Snap mount throttle position sensor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804385A (en) * 1970-09-25 1974-04-16 Nippon Denso Co Spark ignition internal combustion engine
US3911872A (en) * 1972-05-13 1975-10-14 Lucas Electrical Co Ltd Fuel supply systems for internal combustion engines
US3983850A (en) * 1974-01-24 1976-10-05 Robert Bosch G.M.B.H. Apparatus for supplying fuel for acceleration during the warm-up phase of an internal combustion engine
US3926153A (en) * 1974-04-03 1975-12-16 Bendix Corp Closed throttle tip-in circuit
US4149494A (en) * 1975-10-07 1979-04-17 Robert Bosch Gmbh Air quantity metering apparatus
US4466412A (en) * 1979-11-08 1984-08-21 Outboard Marine Corporation Priming and acceleration fuel enrichment system for an internal combustion engine
US5756890A (en) * 1995-11-30 1998-05-26 Ford Global Technologies, Inc. Snap mount throttle position sensor

Also Published As

Publication number Publication date
DE1776155C3 (enrdf_load_stackoverflow) 1975-02-06
CH495502A (de) 1970-08-31
DE1776155A1 (de) 1971-10-07
GB1290182A (enrdf_load_stackoverflow) 1972-09-20
FR2019128A1 (enrdf_load_stackoverflow) 1970-06-26
AT291681B (de) 1971-07-26
SE341889B (enrdf_load_stackoverflow) 1972-01-17
DE1776155B2 (de) 1974-06-20

Similar Documents

Publication Publication Date Title
US3593692A (en) Electrical fuel injection arrangement for internal combustion engines
ES2001947A6 (es) Metodo para inyectar combustible en motores de combustion interna , particularmente de dos tiempos y encendido por chispas, asi como motor yvehiculo correspondientes.
US3616780A (en) Electrically controlled fuel injection arrangement for internal combustion engines
SE8005626L (sv) Brensleinsprutningsmunstycke for forbrenningsmotorer
JPS63289208A (ja) エンジンのバルブ制御装置
GB1418396A (en) Starter assembly for internal combustion engines
GB1506140A (en) Butterfly valves
US3574304A (en) Gasoline engine exhaust valve rotator
JPS57110740A (en) Engine speed controlling apparatus
JPS62503182A (ja) 内燃機関の運転方法
ES2010121A6 (es) Valvula rotativa con mando electrico y dispositivo de alimentacion para motor que la comprende.
US2982805A (en) Ignition system for internal combustion engines
SU476366A1 (ru) Десмодромный клапанный механизм двигател внутреннего сгорани
US3554169A (en) Fuel injection arrangement for internal combustion engines
US3658039A (en) Spark advance device
US2953652A (en) Magnetic distributor assembly
GB882033A (en) Improved decompression device for an internal combustion engine
JPS5543280A (en) Valve driving device of internal combustion engine
JP2592792Y2 (ja) パチンコ発射装置
GB1524029A (en) Internal combustion engine valve operating mechanism
GB849865A (en) "improvements in arrangements for regulating the quantity of fuel delivered by injection pumps to internal combustion engines"
JPS6023472Y2 (ja) エンジンストツプ機能を付加した最大噴射量制御装置
JPH0111929Y2 (enrdf_load_stackoverflow)
JPS614810A (ja) ４サイクルエンジンの吸排気バルブ強制開閉装置
JPS6321810B2 (enrdf_load_stackoverflow)