US3667440A - Fuel injection apparatus for an internal combustion engine - Google Patents

Fuel injection apparatus for an internal combustion engine Download PDF

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Publication number
US3667440A
US3667440A US80631A US3667440DA US3667440A US 3667440 A US3667440 A US 3667440A US 80631 A US80631 A US 80631A US 3667440D A US3667440D A US 3667440DA US 3667440 A US3667440 A US 3667440A
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US
United States
Prior art keywords
fuel
passage
fuel injection
injection apparatus
control valve
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
US80631A
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English (en)
Inventor
Hiroyuki Yoshino
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Application granted granted Critical
Publication of US3667440A publication Critical patent/US3667440A/en
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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/13—Special devices for making an explosive mixture; Fuel pumps
    • F02M2700/1317—Fuel pumpo for internal combustion engines
    • F02M2700/1358—Fuel pump with control of fuel inlet to the pumping chamber

Definitions

  • An apparatus for stopping fuel injection in a fuel [30]
  • Foreign Apphcauon Priority Data injection type internal combustion engine wherein a fuel May 21, 1970 Japan..11...1..., etc................ .45/49O63 upp y passage for a fuel injection pump incorporates a pusher facing an inlet valve of the pump.
  • the pusher is arranged such 3 mfmcm m me m bm fd .m sm .l ame h v S O u c v pr mpaww iwwdm e0.
  • the invention relates to fuel injection apparatus for an internal combustion engine and more specifically to fuel injection apparatus in which fuel injection is immediately terminated when the engine speed is rapidly decreased, such decrease of engine speed being produced when the throttle valve is rapidly closed such as during an engine braking operation.
  • the fuel injection apparatus comprises fuel injection pump means for the supply of fuel to the engine, a fuel passage connected to the pump means for supply of fuel thereto, an inlet valve controlling flow of fuel between said passage and said pump means, a fuel by-pass passage connected to the first said fuel passage, a control valve between said passages for controlling the communication therebetween, means for operating said control valve to open the same upon rapid reduction of engine speed and thereby provide intercommunication between said passage, and pusher means subjected to the pressure in said fuel passage and facing said inlet valve to open the same when the control valve is opened.
  • bypass passage is open to atmospheric pressure and said pusher means comprises a displaceable pusher member for contacting said inlet valve to open the same and a spring means acting on the pusher member to urge the same towards the inlet valve, said pusher member being displaced, by the pressure of the fuel in said first passage, away from the inlet valve against the action of said spring means.
  • the control valve is opened and the pressure in the fuel passage drop to atmospheric whereby the pusher member now displaces the inlet valve to opened position under the action of the spring means.
  • FIGURE of the drawing diagrammatically shows partly in section fuel injection apparatus according to the invention.
  • the drawing shows a fuel injection apparatus wherein fuel sent from a fuel tank 1 by a pump 2 is fed under pressure by an injection pump 3 to a nozzle 4 for discharge within a suction pipe near a combustion chamber, of an internal combustion engine.
  • the invention contemplates stoppage of fuel injection without fail at the time of rapid reduction of speed to prevent discharge of unburned fuel and consequent air pollution.
  • a fuel supply passage 5 for injection pump 3 is provided with an inlet valve opening pusher 7 facing an inlet valve 6 of the pump 3, and the pusher 7 is so arranged that, during ordinary operation, the pusher is displaced to a retracted or inoperative position by the pressure within the fuel supply passage 5 against the action of a spring 8.
  • An opening valve 9 is provided which is moved in conjuction with the rapid reduction of engine speed to cause the fuel supply passage 5 to communicate with the outside atmosphere.
  • the injection pump 3 is of the plunger type.
  • Numeral 10 denotes a cylinder
  • numeral 11 denotes a plunger driven by rotation of a cam
  • numeral 13 denotes a plunger return spring
  • numeral 14 denotes a discharge valve in communication with nozzle 4
  • numeral 15 denotes a pressure control valve provided within an excess fuel return passage 16 for obtaining a supply pressure within the supply passage 5.
  • the illustrated injection pump 3 is for an opposed two cylinder type engine.
  • a by-pass passage 17 is provided for connection with the supply passage 5 to furnish communication with the return passage 16, and the valve 9 is positioned within the passage 17 at the connecting portion thereof with the supply passage 5 as illustrated.
  • the rear surface of the inlet valve opening pusher 7 is open to the outside atmosphere and in the illustrated embodiment the rear portion of the pusher 7 is positioned in the passage 17.
  • the mechanism for the relative movement of valve 9 in conjunction with engine speed is in the form of a diaphragm valve operable in responseto negative pressure produced within the suction pipe at the time of closing of the throttle valve.
  • Numeral 18 denotes a negative pressure pipe which connects a chamber 20 behind a diaphragm 19 and the engine suction pipe.
  • the mechanism for movement of valve 9 may be of various other constructions, such as an electromagnetic valve operable when full closure of the throttle valve is detected, or a valve mechanically coupled to the throttle valve for displacement in conformance with rotation of the throttle valve..
  • the fuel passes through the passage 5 from the pump 2 to reach the inlet valve 6 under a supply pressure determined by the pressure control valve 15.
  • the pressure of the fuel in passage 5 opens valve 6 (against the action of the valve spring) during the suction stroke of plunger 11 to admit fuel to cylinder 10.
  • the fuel is subjected to higher pressure by the plunger 11 and is supplied under the higher pressure to the nozzle 4 for discharge therefrom.
  • the adjustment of the amount of fuel injection is effected by changing the stroke of the plunger 11 and for this purpose cam 12 is of conical shape and is axially moved in relation to the opening and closing operation of the throttle valve.
  • the excess fuel that is, the fuel left over from that supplied to the nozzle 4 is returned to the tank 1 through the passage 16.
  • the fuel supply passage opening valve 9 is moved to open position immediately in conjunction therewith, so that the fuel supply passage 5 is placed in communication with the by-pass passage 17 and the return passage 16, whereby the pressure within the passage 5 becomes atmospheric. Accordingly, the pusher 7 which has been in a retracted position under the pressure of the supply during the period of engine ordinary operation is now no longer subject to the supply pressure and is advanced by the action of the spring 8, whereby the inlet valve 6 is forcibly pushed up to be opened. Consequently, since the inlet valve is opened, any fuel within the cylinder 10 is urged by plunger 11 into the passages 17, 16 (of no resistance) and hence the fuel is not discharged to the nozzle 4. Thus the fuel injection is immediately stopped.
  • valve 9 is closed and the pressure within the supply passage 5 rises, so that the pusher 7 is retracted by this pressure and the inlet valve 6 returns to the ordinary operating condition. In this case, as the passage leading to the cylinder 10 and the discharge valve 14 has already been filled with fuel, the injection can be immediately resumed.
  • the inlet valve 6 of the fuel injection pump 3 when an engine speed reduction operation is effected, the inlet valve 6 of the fuel injection pump 3 is held in an open position so that the pump action of plunger 11 to nozzle 4 cannot be effected and the fuel injection is immediately stopped. This is effective for reduction in the fuel consumption and in purification of the exhaust gas during speed reduction. At the time of re-acceleration, the inlet valve 6 returns immediately to operating position and fuel injection is again effected continuously.
  • a means for stopping fuel injection which effectively operates in accordance with acceleration and reduction operations.
  • a fuel injection apparatus for an internal combustion engine comprising fuel injection pump means for the supply of fuel to the engine, a fuel passage connected to the pump means for supply of fuel thereto, an inlet valve controlling flow of fuel between said passage and said pump means, a fuel by-pass passage open to atmospheric pressure and connected to the first said fuel passage, a control valve between said passages for controlling the communication therebetween, means for operating said control valve to open the same upon rapid reduction of engine speed and thereby provide intercommunication between said passages, and pusher means facing said inlet valve to open the same when the control valve is opened, said pusher means comprising a displaceable pusher member for contacting said inlet valve to open the same, and a spring means acting on the pusher member to urge the same towards the inlet valve, said pusher member being displaceable, by the pressure of the fuel in said first passage, away from the inlet valve against the action of said spring means,
  • Fuel injection apparatus as claimed in claim 1 comprising a pump connected to said first passage to supply fuel under pressure thereto.
  • Fuel injection apparatus as claimed in claim 2 comprising a fuel tank and a return line connecting the by-pass passage to said fuel injection pump means comprises a cylinder for receiving fuel from said fuel passage, a reciprocable plunger in said cylinder, and no72le means connected to said cylinder for discharge of fuel under the pressure developed by said plunger.
  • Fuel injection apparatus as claimed in claim 6 wherein a plurality of fuel injection pump means and corresponding inlet valves are provided, said fuel passage, by-pass passage and control valve being common to the plurality of pump means and respective inlet valves.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
US80631A 1970-05-21 1970-10-14 Fuel injection apparatus for an internal combustion engine Expired - Lifetime US3667440A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970049063U JPS4727091Y1 (enExample) 1970-05-21 1970-05-21

Publications (1)

Publication Number Publication Date
US3667440A true US3667440A (en) 1972-06-06

Family

ID=42923892

Family Applications (1)

Application Number Title Priority Date Filing Date
US80631A Expired - Lifetime US3667440A (en) 1970-05-21 1970-10-14 Fuel injection apparatus for an internal combustion engine

Country Status (5)

Country Link
US (1) US3667440A (enExample)
JP (1) JPS4727091Y1 (enExample)
DE (1) DE2049083A1 (enExample)
FR (1) FR2092242A5 (enExample)
GB (1) GB1270497A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5724945A (en) * 1996-09-18 1998-03-10 Gas Research Institute Carburetor air/fuel ratio control for single cylinder engines

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930370A (en) * 1956-08-16 1960-03-29 Bendix Aviat Corp Fuel injection system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930370A (en) * 1956-08-16 1960-03-29 Bendix Aviat Corp Fuel injection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5724945A (en) * 1996-09-18 1998-03-10 Gas Research Institute Carburetor air/fuel ratio control for single cylinder engines

Also Published As

Publication number Publication date
JPS4727091Y1 (enExample) 1972-08-18
FR2092242A5 (enExample) 1972-01-21
DE2049083A1 (de) 1971-12-02
GB1270497A (en) 1972-04-12

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