US3695245A - Fuel supply system for internal combustion engines - Google Patents

Fuel supply system for internal combustion engines Download PDF

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Publication number
US3695245A
US3695245A US91618A US3695245DA US3695245A US 3695245 A US3695245 A US 3695245A US 91618 A US91618 A US 91618A US 3695245D A US3695245D A US 3695245DA US 3695245 A US3695245 A US 3695245A
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United States
Prior art keywords
fuel
pressure
engine
manifold
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
US91618A
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English (en)
Inventor
Takashi Ishida
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.)
Mikuni Corp
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Mikuni Corp
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Filing date
Publication date
Application filed by Mikuni Corp filed Critical Mikuni Corp
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Publication of US3695245A publication Critical patent/US3695245A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/002—Circuit elements having no moving parts for controlling engines, turbines, compressors (starting, speed regulation, temperature control or the like)

Definitions

  • a fuel supply system for internal combustion engines 1 comprising an engine rpm function control circuit for 140 123/ l 19 R, l2 controlling fuel flow in conformity with the rpm of the v 140 R engine, a manifold boosted pressure function control [5 Clcircuit for controlling fuel flow in conformity the [58] m of search-12y l 19 140 36 boosted pressure in the manifold, a summing impact 123/261 F L1 69 modulator for causing fuel controlled by said two cir- 6 f cuits to be injected, and a transverse impact modula- [5 1 Re erences Cned tor for supplying air in amounts such that proper pro- UNITED STATES PATENTS portions of air and fuel can be obtained in conformity with the boosted pressure
  • an object of the present invention is to provide a fuel supply system for internal combustion engines which employs fluid elements in the fuel injection control circuit to ensure that fuel injection positively takes place during each suction stroke of the engine.
  • the rpm of the engine is converted into a pneumatic pressure in the present invention, and the pneumatic pressure detected and the boosted pressure in the manifold are applied to an operation device which is provided with fluid elements so as to operate a fuel injection device.
  • the fuel supply system according to this invention constructed as aforementioned has many advantages. According to the invention, the rpm of the engine, and the boosted pressure in the manifold are detected in terms of pneumatic pressures and the operation device is driven by the pneumatic pressures, so that it is possible to obtain optimum air-fuel mixtures over a wide range of vehicle speeds under all engine operation conditions.
  • the fuel supply system according to this invention is free from the influences of vibration and noise. Besides, atomization of fuel can be effected satisfactorily.
  • FIG. 9 is a view showing a modification of FIG. 6 in which the parts following the one shot circuit are changed.
  • FIG. 6 shows a first embodiment of the fuel supply system according to this invention which comprises an engine rpm function control circuit ERF, manifold boosted pressure function control circuit MBF, summing impact modulator SIM for causing fuel to be injected in conformity with the outputs of the two aforementioned circuits, and a transverse impact modulator TIM for supplying air in amounts such that correct proportions of air and fuel can be obtained in conformity with the boosted pressure.
  • the engine rpm function control circuit ERF detects the number of revolution per minute of a rotary shaft 20 connected to the engine crank shaft and the like and controls fuel flow in accordance with the rpm of the engine.
  • the manifold boosted pressure function control circuit MBF controls fluid flow in terms of the boosted pressure in a manifold using the boosted pressure as an input.
  • the manifold 10 is provided with a throttle valve 11 on the opening side and an inlet valve 12 on the engine side, and a boosted pressure detection aperture 13 is formed in the wall of the manifold 10 in a position below the throttle valve 11.
  • the summing impact modulator SIM is attached to the manifold 10 in the form of an injection element IE.
  • the valve stem 26 extends through the interior of a casing of the control valve CV which is divided into two chambers 28 and 29 by a valve seat 32 cooperating with a needle 27 attached to a rear end of the valve stem 26.
  • An air supply port 30 is formed in the wall of one chamber 28 and an air exhaust port 31 is formed in the wall of the other chamber 29.
  • the valve stem 26 extending through the valve casing is normally urged by the biasing force of a spring 33 to move in a direction such that the forward end of the valve stem 26 is brought into engagement with an end surface of the arm 25 and the needle 27 is seated at the valve seat 32.
  • This circuit MBF comprises a pneumatic pressure control valve FV and fuel flow control valve FV connected in series with each other.
  • the circuit SIM is formed into an injection element IE to be built in the manifold as shown in FIG; 7. It will be seen that the injection ports in, and in have apertures which are juxtaposed to each other with a small clearance being interposed therebetween, and that a cover. 52 is provided around the injection port in to which a drain 51 is connected.
  • the boosted pressure in the manifold is led to the pneumatic pressure control valve FV, including the bellows and needle.
  • the needle 39 of the pneumatic pressure control valve FV is set such that the output of the control valve FV, is reduced in value when the absolute value of the boosted pressure is increased, and increased when the absolute value of the boosted pressure is reduced.
  • the pneumatic pressure regulated in this way is supplied to the fuel flow control valve FV to which fuel is supplied.
  • the fuel flow control valve FV is constructed such that by selecting a suitable shape for the needle 39 it is possible to draw curves of fuel consumption as shown in FIG. 5. A manifold boosted pressure function can be obtained in this way.
  • the lines 64 and 65 can be constructed such that, when the absolute value of the boosted pressure in the manifold exceeds a certain level, there is no output of the fuel flow control valve FV At the same time, air is supplied to the summing impact modulator SIM in the manifold 10 in the form of a steady current and not in pulse form.
  • Electric systems of the prior art are disadvantageous in that misoperation of operation circuit may result from vibration, abnormal engine temperatures and electromagnetic wave noise.
  • the injection nozzle portion requires no less high precision machining than in mechanical systems.
  • FIG. 8 shows another embodiment of the invention in which the summing impact modulator SIM serving as an injection element in the embodiment shown in FIG.
  • FIG. 11 shows a modification in which the air pressure control valve FV of the embodiment shown in FIG. 6 is replaced by the transverse impact modulator TIM instead of the proportioning element.
  • FIG. 12 shows a modification in which fuel of boosted pressure function is supplied only to the supply port in of the summing impact modulator SIM while the engine rpm function is operated by air, and pneumatic signals are supplied to the supply port in of the modulator SIM, so that an impact surface of fuel and 8. aircanbefo ed in the manifold.
  • a boosted pressure detection circuit including a proportioning element connected to a line bypassed from the boosted pressure detection circuit and a transverse impact modulator connected to the output side of said proportioning element;

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
US91618A 1969-11-22 1970-11-23 Fuel supply system for internal combustion engines Expired - Lifetime US3695245A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9381469 1969-11-22

Publications (1)

Publication Number Publication Date
US3695245A true US3695245A (en) 1972-10-03

Family

ID=14092852

Family Applications (1)

Application Number Title Priority Date Filing Date
US91618A Expired - Lifetime US3695245A (en) 1969-11-22 1970-11-23 Fuel supply system for internal combustion engines

Country Status (3)

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US (1) US3695245A (de)
DE (1) DE2057216B2 (de)
GB (1) GB1337115A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874352A (en) * 1970-11-23 1975-04-01 Takashi Ishida Fuel supply system for an internal combustion engine
US4031870A (en) * 1975-03-20 1977-06-28 Mikuni Kogyo Co., Ltd. Fuel charge injection apparatus for internal combustion engines
US4136658A (en) * 1977-01-17 1979-01-30 Caterpillar Tractor Co. Speed sensitive pressure regulator system
US6092021A (en) * 1997-12-01 2000-07-18 Freightliner Corporation Fuel use efficiency system for a vehicle for assisting the driver to improve fuel economy

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105425862B (zh) * 2015-11-10 2017-07-25 福州欣联达电子科技有限公司 一种访问参数设置系统的方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874352A (en) * 1970-11-23 1975-04-01 Takashi Ishida Fuel supply system for an internal combustion engine
US4031870A (en) * 1975-03-20 1977-06-28 Mikuni Kogyo Co., Ltd. Fuel charge injection apparatus for internal combustion engines
US4136658A (en) * 1977-01-17 1979-01-30 Caterpillar Tractor Co. Speed sensitive pressure regulator system
US6092021A (en) * 1997-12-01 2000-07-18 Freightliner Corporation Fuel use efficiency system for a vehicle for assisting the driver to improve fuel economy

Also Published As

Publication number Publication date
DE2057216A1 (de) 1971-06-24
DE2057216B2 (de) 1973-10-25
GB1337115A (en) 1973-11-14
DE2057216C3 (de) 1974-05-22

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