US3269378A - Apparatus in controlling the supply of fuel to a combustion engine - Google Patents

Apparatus in controlling the supply of fuel to a combustion engine Download PDF

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Publication number
US3269378A
US3269378A US490744A US49074465A US3269378A US 3269378 A US3269378 A US 3269378A US 490744 A US490744 A US 490744A US 49074465 A US49074465 A US 49074465A US 3269378 A US3269378 A US 3269378A
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United States
Prior art keywords
carrier
shaft
axis
sleeve
cam
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Expired - Lifetime
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US490744A
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English (en)
Inventor
Eifler Horst
Knapp Heinrich
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F02D1/025—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by means dependent on engine working temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F02D1/08—Transmission of control impulse to pump control, e.g. with power drive or power assistance
    • F02D1/10—Transmission of control impulse to pump control, e.g. with power drive or power assistance mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D3/00—Controlling low-pressure fuel injection, i.e. where the fuel-air mixture containing fuel thus injected will be substantially compressed by the compression stroke of the engine, by means other than controlling only an injection pump

Definitions

  • the present invention relates to apparatus for controlling the supply of fuel to a combustion engine, and more particularly to an apparatus in which the fuel supply is controlled not only depending on the position of the throttle controlling the supply of air to the combustion engine, but also depending on the speed at which the fuel pump operates.
  • the fuel valve of the fuel pump has a cam follower controlled by a three dimensional cam which is displaced in a rst direction by means responsive to the position of the air throttle, and in a second transverse direction by means which are responsive to the rotary speed of the fuel pump.
  • Another object of the invention is to provide an apparatus for controlling the supply of fuel to a combustion engine by which only small forces are transmitted to the means by which the throttle is operated by the driver.
  • Another object of the invention is to provide an apparatus of this type which can be easily adjusted.
  • one embodiment of the invention comprises a rotary fuel pump; a cam having a three dimensional surface engaged by a cam follower which controls means by which the amount of fuel pumped to the engine is adjusted; means for controlling the ow of air into the engine operatively connected with the cam for turning the same about a first axis; and speed responsive means moving in dependence of the speed of the fuel pump and operatively connected with the cram for turning the same about a second axis.
  • the cam is displaced in two transverse directions for actuating the cam follower which engages its three dimensional surface, and the cam follower acts on the adjusting valve of the fuel pump to vary the amount of fuel pumped to the engine depending not only on the speed of the fuel pump but also on the position of the throttle which is used by the driver to control the ow of air into the engine.
  • the cam is mounted on a carrier lever which is turnable about universal joint means permitting the turning of the carrier with the cam about two perpendicular axes.
  • the joint means preferably include a pin having one end abutting a stationary support, and another end providing a fulcrum for the carrier.
  • the pin has two pointed ends, permitting angular displacement of the pin in all directions.
  • FIG. 1 is an elevation, partially in longitudinal section, and including a schematic view of a detail
  • FIG. 2 is a cross sectional view, taken on line II-II in FIG. 1;
  • FIG. 3 is a schematic view illustrating control means connecting the throttle with the carrier of the cam, details being omitted for the sake of simplicity.
  • a fuel pump 2 has a rotary shaft 1 slidably supporting a sleeve 3 of a centrifugal governor, only partly shown.
  • Sleeve 3 is turnable on sh-aft 1, and also slidable in axial direction of the same, and is controlled by a centrifugal governor 103 to move in axial direction distances proportionate to the rotary speed of shaft 1 and fuel pump 2.
  • the governor 103 includes a disk 3c fixed to shaft 1 and balls 3b urged outwardly by the centrifugal force to act on the frustoconical inner surface of member 3a to displace the same with sleeve 3 along shaft 1.
  • a pair of diameterically arranged pivot pins 4 and 4 are fixed in bores of sleeve 3 and provide journals for the two lateral parts of a carrier 5.
  • a cam 6 having a three dimensional surface 7 is secured to one end of carrier 5.
  • a cam follower roller 8 is mounted on a cam follower lever 9 which is connected by a pin 14 located in a slot 15 to a lever arm 16 which controls shaft 17 of a valve, not shown, which regulates the amount of fuel supplied by fuel pump 2 when angularly displaced.
  • Cam follower lever 9 is mounted on a journal 10 for turning movement. Journal 10 is eccentrically mounted on a shaft 11 so that tuming of shaft 11 about its axis will displace the turning axis of cam follower lever 9.
  • shaft 11 is mounted in a bearing 11a and .has an arm 11b operated by a thermostat 13 so that, depending on the temperature to which the thermostat is exposed, the position of the axis about which cam follower means 8, 9 turns, and the relative position of cam follower roller 8 and cam surface 7 are adjusted.
  • the thermostat 13 is located in the region of the combustion engine so that the cold or warm condition of the engine influences the position of the cam follower means.
  • carrier 5 has a cutout 19, and a longitudinal bore in which a pin 18 is mounted so as to traverse cutout 19.
  • Pin 18 has spaced annular grooves, one of which is located in cutout 19.
  • a pair of bolts 22 and 23 pass through bores in a stationary support frame 12 of fuel pump 2, and have openings into which the hooked ends of a pair of springs 20 and 21 are inserted.
  • the other end of spring 21 engages the outer groove of pin 18, while the other end of spring 2t) embraces the inner annular groove, without actually resiliently engaging the same in the position shown in FIG. l.
  • the threaded end of bolts 22 and 23 carry nuts 24 and 25 so that the positions of springs 20 and 21 can be adjusted.
  • Support frame 12 of fuel pump 2 has a conical recess 27 located opposite a corresponding conical recess 28 in carrier 5.
  • a pin 26 has pointed ends respectively located in recesses 27 and 28, and held in the same by the pressure exerted by spring 21.
  • pin 26 When sleeve 3 with carrier 5 is turned about shaft 1, pin 26 is angularly displaced about its pointed end 261; since its end 26a is moved along an imaginary cylinder having its axis coinciding with the axis of shaft 1, whereas the end 26b remains stationary.
  • pin 26 When sleeve 3 moves in axial direction of shaft 1, pin 26 provides a fulcrum and an axis about which carrier S turns. This axis is parallel to the axis defined by journal pins 4, 4 and passes substantially through the pointed end 26a of pin 26.
  • journal pin 4 When the rotary speed of fuel pump 2 is increased to a maximum, the centrifugal governor moves sleeve 3 to a position in which journal pin 4 is in the position 4a.
  • the axis of journal pins 4, 4', the pointed end 26h of pin 26, and the openings 24a and 25a are located in a plane or, in other words, the point of intersection of the axis defined by journal pins 4, 4 with the axis of yshaft 1, and points 26h, 24a, and 25a are located on a straight dot-dash line shown in FIG. 1.
  • a stud 30 is secured to carrier 5 coaxial wit-h journal pins 4, 4 and has a free end with a spherical journal 31 located in an opening of a link 32, as shown in FIG. 2.
  • FIG. 3 shows shaft 34 not only in end view, but also schematically as a chain line.
  • a lever arm 35 projects in radial direction from shaft 34, and is connected by a link 35a which is coupled with a throttle valve 36 and with a foot pedal 38 urged by spring 38a to move toward the right in FIG. 4 until lever arm 35 abuts the first abutment 40 of a turnable stop 39 which is mounted on the stationary supporting frame of the fuel pump.
  • Stop 39 has a second abutment 41 cooperating with lever arm 35 in a second angularly turned position of stop 39 permitting a greater displacement of foot pedal 38, and of throttle valve 36 which is located in a tube 37 through which air is supplied to the combustion engine to which fuel is pumped by the injection fuel pump 2.
  • Abutrnent 40 permits turning of throttle valve 36 to a position required for supplying air Ito ⁇ a cold idling enengine, while abutment 41 determines the position of throttle valve 36 yfor supplying air to a warm idling engine.
  • Stop 39 is connected with thermostat 13 by a linkage, not shown, and is shifted under control of the thermostat which senses whether the engine is cold or hot.
  • the apparatus is shown in a position corresponding to rotation of the fuel pump at the lowest speed, and with throttle valve 36 in a position corresponding to a partial load.
  • journal pin 4 assu-mes the position 4a shown in chain lines so that the point of intersection of axis 4, 4 with the axis of shaft 1, and points 26b, 24a and v25a are aligned.
  • carrier 5 turns about an axis passing parallel to the axis of journal pins 4, 4 through the pointed end 26a of pin 26 which is slightly displaced during this movement about an axis passing through the pointed end 26b.
  • spring 21 is tensioned at rst, but before the position 4a is reached, spring is also resiliently tensioned.
  • thermostat 13 has turned stop 39 to the position in which abutment 40 is operative.
  • spring 38a will move link 35a and lever arm to a position abutting abutment 40, but FIG. 3 s-hows a position in which the operator has displaced foot pedal 38 corresponding to a certain load.
  • thermostat 13 turns stop 39 so that abutment 41 is located opposite lever arm 35, permitting a displacement of link 35a, and turning of throttle Valve 36 to a position reducing the free cross section of the air tube 37 so that a lesser amount of air is supplied to the engine in warm condition than in cold condition in which a greater amount of fuel is required for warming up the engine.
  • the centrifugal governor 103 displaces sleeve 3 in axial direction so that carrier 5 pivots about a second axis crossing the first axis of shaft 1 at right angles, and passing through the pointed end 26a of pin 26.
  • Turning of carrier 5 about the second axis causes displacement of cam 6 so that cam follower roller 8 moves over the three dimensional calm surface 7 whereby cam follower lever 9 is displaced to adjust the position of the lever 16, shaft 17 and of the valve controlling the amount of fuel supplied to the engine.
  • cam surface 7 Since movements of cam 6 in two transverse directions inliuence cam follower means 9, 8, the cam surface 7 must be three dimensional and designed to obtain the desired adjustments ⁇ of the amount of fuel supplied to the engine.
  • throttle means 36, 38 are connected with cam means 6, 5 to turn t-he same about a rst axis defined by shaft 1, and that the speed responsive centrifugal governor 103 with sleeve 3 is connected with the cam means for turning the same about the second axis defined by the pointed end 26a and extending parallel to journal pins 4, 4.
  • First control means 35a, 35, 34, 33, 32 connect carrier 5 of cam 6 with throttle means 38, 36, and second control means in the form of pins 4, 4 connect carrier 5 with the speed responsive means including sleeve 3 and a centrifugal goverenor 103, w-hose portion 3a is iixedly connected with sleeve 3.
  • journal pins 4, 4 When the apparatus operates at maximum speed, journal pins 4, 4 are located in the position 4a. Since pin 26 and springs 20, 21 are located in a plane perpendicular to a plane passing through the axis of journal pins 4, 4', pointed end 26h, and points 24a and 25h, no forces, or only very small forces are transmitted in the region of the maximum speed from springs 20, 21 by the first control means 30, 32, 33, 34, 35, 35a to the throttle means 36 and the operator controlled foot pedal 38 so that the operation of the throttle is not inliuenced by forces produced by the springs or by the displaced lsleeve 3.
  • An apparatus for controlling the supply of fuel to a combustion engine comprising, in combination, fuel pump means having means for varying the amount of fuel pumped to said engine including cam follower means; rotary drive shaft for ydriving said fuel pump means; a cam having a three dimensional cam face engaged lby saidy cam follower means; a carrier for said cam; a sleeve mounted on said shaft, for turning movement about the axis of said shaft, and for sliding movement in axial direction of said shaft; a pair of journal pins pivotally supporting said carrier on said sleeve; a support having a recess, said carrier having a recess located opposite said recess in one turned position of said sleeve; a pin having pointed ends respectively located in said recesses of said support and 0f said carrier and supporting said carrier for turning movement about an axis perpendicular to said axis of said shaft so that said carrier and said earn turn about said second axis when said sleeve moves in longitudinal direction of said shaft;
  • said spring means include two springs attached to said carrier at two spaced points, one of said springs being longer so that during turning movement of said carrier with said cam about said second axis toward a position corresponding to an increased speed, iirst one and then the other of said springs becomes effective to oppose the 4movement of the carrier.
  • An apparatus including adjusting means for adjusting each of said springs.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
  • Fuel-Injection Apparatus (AREA)
US490744A 1964-09-26 1965-09-27 Apparatus in controlling the supply of fuel to a combustion engine Expired - Lifetime US3269378A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB0078683 1964-09-26

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US3269378A true US3269378A (en) 1966-08-30

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US (1) US3269378A (de)
AT (1) AT255834B (de)
GB (1) GB1090555A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4694857A (en) * 1986-03-31 1987-09-22 Stant Inc. Fuel sender unit

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2117105A (en) * 1934-07-13 1938-05-10 Schimanek Emil Device for regulating the running of injection engines at different speeds of revolution
US2193927A (en) * 1935-02-28 1940-03-19 Jivkovitch Alexander Steering gear
US2841129A (en) * 1954-08-04 1958-07-01 Reggio Ferdinando Carlo Engine control system
US2858822A (en) * 1956-12-18 1958-11-04 Staege Werner Device for influencing engine fuel delivery by two mutually independent operating conditions
US2929369A (en) * 1957-10-16 1960-03-22 Kugelfischer G Schaefer & Co Method of and device for controlling the idling operation of spark ignition liquid fuel injection internal combustion engines
US2929370A (en) * 1957-10-16 1960-03-22 Kugelfischer G Schaefer & Co Device for controlling the idling operation of spark-ignition internal combustion engines with fuel injection
US2984232A (en) * 1959-03-26 1961-05-16 Borg Warner Fuel injection control
US3146770A (en) * 1959-10-10 1964-09-01 Alfa Romeo Spa Regulator for injection pumps for carburettor engines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2117105A (en) * 1934-07-13 1938-05-10 Schimanek Emil Device for regulating the running of injection engines at different speeds of revolution
US2193927A (en) * 1935-02-28 1940-03-19 Jivkovitch Alexander Steering gear
US2841129A (en) * 1954-08-04 1958-07-01 Reggio Ferdinando Carlo Engine control system
US2858822A (en) * 1956-12-18 1958-11-04 Staege Werner Device for influencing engine fuel delivery by two mutually independent operating conditions
US2929369A (en) * 1957-10-16 1960-03-22 Kugelfischer G Schaefer & Co Method of and device for controlling the idling operation of spark ignition liquid fuel injection internal combustion engines
US2929370A (en) * 1957-10-16 1960-03-22 Kugelfischer G Schaefer & Co Device for controlling the idling operation of spark-ignition internal combustion engines with fuel injection
US2984232A (en) * 1959-03-26 1961-05-16 Borg Warner Fuel injection control
US3146770A (en) * 1959-10-10 1964-09-01 Alfa Romeo Spa Regulator for injection pumps for carburettor engines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4694857A (en) * 1986-03-31 1987-09-22 Stant Inc. Fuel sender unit

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GB1090555A (en) 1967-11-08
AT255834B (de) 1967-07-25

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