US3776210A - Control apparatus for fuel injection system - Google Patents

Control apparatus for fuel injection system Download PDF

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Publication number
US3776210A
US3776210A US00223438A US3776210DA US3776210A US 3776210 A US3776210 A US 3776210A US 00223438 A US00223438 A US 00223438A US 3776210D A US3776210D A US 3776210DA US 3776210 A US3776210 A US 3776210A
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US
United States
Prior art keywords
cam
plunger
latch
engine
response
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
US00223438A
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English (en)
Inventor
G Beasley
G Whitehurst
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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Filing date
Publication date
Application filed by Lucas Industries Ltd filed Critical Lucas Industries Ltd
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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
    • F02M69/12—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel comprising a fuel-displaced free-piston for intermittently metering and supplying fuel to injection nozzles
    • F02M69/125—Means for varying the stroke of the free-piston
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
    • F02D2700/02—Controlling by changing the air or fuel supply
    • F02D2700/0269—Controlling by changing the air or fuel supply for air compressing engines with compression ignition
    • F02D2700/0282—Control of fuel supply

Definitions

  • No.2 223,438 fuel injection system has a cam rotatablebetween a normal position and a cold-starting position, a cam [30] Foreign Application Priority Data follower movable in response to engine intal e manifold pressure to vary the position of a metering valve Great 5857/ 71 control stop in accordance with said pressure and with May 2, 1971 Great Bntam 4,094/71 the cam position, and a latch pivotally mounted on the cam and biased so as to limit movement of said con- [52] 5 trol stop, and hence fuel flow, when the engine is started with the cam in its normal position.
  • the latch is moved by the cam follower to an inoperative posig tion when the engine is running, A damping arrange- 1 g ment slows movement of the latch in response to its 140 M 179 biasing means.
  • This invention relates to a control apparatus for an internal combustion engine fuel injection system of the type which includes a shuttle metering device wherein the amount of fuel injected is variable by means of a control stop. It is an object of the invention to provide such an apparatus in a convenient form.
  • a control apparatus for a fuel injection system of the foregoing type comprises an edge cam pivotal about an axis in response to a control which is operable during cold starting of an associated engine, a cam follower movable relativeto the cam in response to the pressure in an intake manifold of the engine, a plunger engageable at one end thereof with the cam follower and coacting with said control stop,
  • - latch means pivotally mounted on said cam and engageable with said one end of the plunger to restrict fuel supply to the engine, and abutment means engageablewith the latch means to move the latter away from the plunger when said cam is moved in response to said control, means biasing said latch means towards said engagement with the plunger and damping means opposing movement'of said latch means by said biasing means.
  • FIG. 1 is a section through an apparatus
  • FIG. 2 is a section through an alternative form of apparatus.
  • a shuttle-type metering device shown generally at 10. includes a control stop 11 which controls, in a known manner, the amount of fuel injected into an associated engine, fuel is supplied to the device by a pump 12.
  • the control apparatus has a casing 13 within which an edge cam 14 is secured to a pivotally mounted spindle 15.
  • Cam 14 is biased in a clockwise direction, as shown in the drawing, by a spring 16.
  • Cam 14 is rotatable against the bias of spring 16 by an external engine throttle control, applied via spindle 15. Clockwise movement of cam 14 is limited by a stop .17.
  • a cam follower 18 includes a pair of arms 19 between which are mounted rollers 20 which engage cam 14.
  • Follower 19 is movable in the plane of cam 14 by a diaphragm arrangement 21 responsive to the depression in the intake manifold of the engine.
  • a plunger 22 has a face engageable with rollers 20 and abuts the control stop 11. Plunger 22 is biased by a spring 33 away from rollers 20.
  • a latch 23 is mounted on cam 14 for movement about a pivot 24 and is engageable with face 25 of plunger 22, a torsion spring 26 biasing plunger 22 towards such engagement.
  • Latch 23 lies between arms 19 and includes an arm 23a lying between arms 19 of follower 18. Arm 23a is engageable by a pin 27 which extends between the arms 19.
  • An adjustable stop 28 engages a projection 29 on latch 23 and comprises a threaded stud in which a plunger 31 is a sliding fit.
  • ⁇ Plunger 31 is biased into engagement with portion 29 by a light compression spring 32.
  • cam follower 18 In use. during cold starting cam follower 18 is at the extreme left hand end of its travel, there being no depression in the engine intake manifold. Cam 14 is moved anticlockwise by the external control, which is operated only during cold starting. Engagement of projection 29 first against plunger 31 and then against stud 30 causes latch 23 to be moved clockwise away from face 25. Downward movement of plunger 31 is initially resisted by air trapped behind plunger 31 which thus provides a dashpot arrangement. Control stop 11 and plunger 22 can thus be displaced downwardly against spring 33 by pressure delivered by pump 12, until plunger 22 engages rollers 20. A maximum amount of fuel is thereby delivered to the engine.
  • the delay imposed on latch 23 enables plunger 22 to move downwards after follower 18 before latch 23 moves into the path of plunger 22. Latch rests against the side of plunger 22 as before.
  • the apparatus thus permits over-fuelling during cold starting, but prevents this during hot starting.
  • FIG. 2 The alternative form of apparatus shown in FIG. 2 is generally similar to that of FIG. 1, corresponding components being assigned corresponding reference numbers.
  • the adjustable stop 28 is in this case, however, in the form of a plain stud.
  • a helical spring 30 has one end rigidly secured to a further projection 34 on latch 23. Secured to the other end of spring 30 is a resilient, part spherical, hollow rubber part 35 which lies adjacent a wall casing c sing 13.
  • a passage 38 extends through the casing wall adjacent part 35. Passage 38 communicates via restrictor 34 with the engine intake manifold.
  • Operation of the apparatus of FIG. 2 is substantially the same as that of the apparatus of FIG. 1, except that when the engine is over-running, the resultant high manifold depression moves cam follower 18 to the right to reduce fuel flow to the engine, pin 27 ensuring that latch 23 is dipslaced out of the path of plunger 22 as previously described, rubber part 35 being brought into contact with the adjacent part of casing 13.
  • the manifold depression is transmitted via passage 38 to flatten part 35 against the adjacent part of the casing 13, so that, through the medium of spring 30, latch 23 is held in its clockwise position.
  • follower 18 moves to the left, and latch 23 moves anticlockwise under the influence of spring 26 at a rate dependent on the rate of increase in pressure in passage 38.
  • the rate at which pressure in passage 38 increases depends on the size of restrictor 36 and its distance from part 35. Movement of latch 23 to follow cam follower 18 is thus damped to an extent depending on the size and location of restrictor 36.
  • the delay enables plunger 22 to move downwards after follower 18 before latch 23 moves into the path of plunger 22.
  • Latch 23 rests against the side of plunger 22 as before.
  • a control apparatus for an internal combustion engine fuel injection system which includes a shuttle metering device whereby the amount of fuel injected is variable by a control stop, comprises an edge cam pivotal about an axis, in response to a control which is operable during cold starting of an associated engine, a cam follower movable relative to the cam in response to the pressure in an intake manifold of the engine, a plunger engageable at one end thereof with the cam follower and coacting with said control stop, latch means pivotally mounting on said cam and engageable with said one end of the plunger to restrict fuel supply to the engine, and abutment means engageable with the latch means to move the latter away from the plunger when said cam is moved in response to said control means biasing said latch means towards said engagement with the plunger and damping means opposing movement of said latch means by said biasing means.
  • An apparatus as claimed in claim 1 which includes an abutment on said cam follower and engageable with said latch means to move the latter away from engagement with the plunger as the cam follower moves in response to a fall in intake manifold pressure.
  • An apparatus as claimed in claim 1 in which the means biasing the latch means towards engagement with the plunger comprises a torsion spring.
  • said abutment means comprises a stud whose position relative to the pivotal axis of said cam is adjustable.
  • said damping means comprises a further plunger slidable within said stud and a spring urging said further plunger into engagement with said latch means.
  • damping means comprises a hollow, resiliently deformable abutment, a passage connecting the inside of said element with said engine intake manifold and a spring means connected to said deformable element and to the latching means, whereby a suction in said intake manifold pressure causes said spring means to apply an increased force to said latch means.

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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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
US00223438A 1971-03-02 1972-02-04 Control apparatus for fuel injection system Expired - Lifetime US3776210A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB585771 1971-03-02
GB409471A GB1371762A (en) 1971-03-02 1972-01-25 Control apparatus for an internal combustion engine fuel injection system

Publications (1)

Publication Number Publication Date
US3776210A true US3776210A (en) 1973-12-04

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ID=26238864

Family Applications (1)

Application Number Title Priority Date Filing Date
US00223438A Expired - Lifetime US3776210A (en) 1971-03-02 1972-02-04 Control apparatus for fuel injection system

Country Status (8)

Country Link
US (1) US3776210A (es)
JP (1) JPS5028574B1 (es)
AU (1) AU456768B2 (es)
DE (1) DE2205334C3 (es)
ES (1) ES399757A1 (es)
FR (1) FR2125085A5 (es)
GB (1) GB1371762A (es)
IT (1) IT948420B (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4727839A (en) * 1985-03-09 1988-03-01 Robert Bosch Gmbh Pneumatic diaphragm control element for a fuel injection apparatus in internal combustion engines
US4969436A (en) * 1988-02-18 1990-11-13 Kloeckner-Humboldt-Deutz Ag Diesel engine injection pump governor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965091A (en) * 1957-06-13 1960-12-20 Holley Carburetor Co Cold start and warm up system for fuel injection

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965091A (en) * 1957-06-13 1960-12-20 Holley Carburetor Co Cold start and warm up system for fuel injection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4727839A (en) * 1985-03-09 1988-03-01 Robert Bosch Gmbh Pneumatic diaphragm control element for a fuel injection apparatus in internal combustion engines
US4969436A (en) * 1988-02-18 1990-11-13 Kloeckner-Humboldt-Deutz Ag Diesel engine injection pump governor

Also Published As

Publication number Publication date
FR2125085A5 (es) 1972-09-22
AU3849272A (en) 1973-08-02
ES399757A1 (es) 1974-12-01
IT948420B (it) 1973-05-30
AU456768B2 (en) 1974-12-09
DE2205334B2 (de) 1975-05-07
DE2205334A1 (de) 1972-08-17
GB1371762A (en) 1974-10-23
DE2205334C3 (de) 1975-12-11
JPS5028574B1 (es) 1975-09-17

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