US3670710A - Apparatus and methods for controlling the amount of fuel injected into an internal combustion engine - Google Patents

Apparatus and methods for controlling the amount of fuel injected into an internal combustion engine Download PDF

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Publication number
US3670710A
US3670710A US86192A US3670710DA US3670710A US 3670710 A US3670710 A US 3670710A US 86192 A US86192 A US 86192A US 3670710D A US3670710D A US 3670710DA US 3670710 A US3670710 A US 3670710A
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US
United States
Prior art keywords
valve
passage
throttle valve
openings
negative pressure
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
US86192A
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English (en)
Inventor
Tasuku Date
Eiichi Hashimoto
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
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Publication of US3670710A publication Critical patent/US3670710A/en
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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
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44

Definitions

  • ABSTRACT The amount of fuel injected into an inlet passage of an internal combustion engine leading to a cylinder thereof is regulated by a control device in response to suction pressure in the passage and to the degree of opening of a throttle valve in the passage.
  • An object of this invention is to provide an apparatus in which the suction pressure is compensated in response to the open degree of the throttle valve and accordingly the control is effected by the suction pressure modulated by the open degree of the throttle valve.
  • the invention is characterized by a construction in which an engine suction passage having a butterfly type throttle valve is provided with a main negative pressure opening situated behind the throttle valve and also with a subsidiary negative pressure opening situated at a position which lies downstream of the valve when the valve is closed but faces the edge of the valve when the valve is slightly opened, and the openings being coupled such that the negative pressures therein are combined to provide a resultant negative pressure.
  • FIG. I is a section side view of a portion of one embodiment according to this invention.
  • FIG. 2 is a graph showing the characteristic curve of suction pressure vs. fuel injection amount for explaining the operation of the embodiment of the invention.
  • numeral 1 denotes the main body of an internal combustion engine
  • numeral 2 denotes a suction valve opening therein
  • numeral 3 denotes a suction passage connected thereto
  • numeral 4 denotes a butterfly type throttle valve in passage 3.
  • This suction passage 3 is provided with a main negative pressure sensing opening 5 situated downstream of throttle valve 4, i.e., on the engine side in the drawing, and this opening 5 is in communication with a pressure responsive type control apparatus 8 for regulation of the injection quantity in a fuel injection device connected to a fuel injection nozzle 6.
  • the control apparatus 8 is known and comprises, for instance, a pressure responsive type diaphragm, and when the fuel injection apparatus comprises, for instance, a cam push type plunger pump, it is so constructed that the lift degree of the cam is adjusted in accordance with the deflection degree of the diaphragm.
  • the required amount of fuel injection changes not only in dependence on the change of the suction pressure in passage 3 but also on the open degree of the throttle valve 4.
  • the required fuel injection amount for each engine speed for instance, 2,000 r.p.m., 3,000 r.p.m. changes as shown by curves a, b and c in FIG. 2, so that when the characteristic feature of the fuel injection control apparatus is set as a line A also shown in FIG. 2, there is caused a lack of fuel especially for comparatively large open degrees of the throttle valve.
  • this invention contemplates a construction as follows:
  • a subsidiary negative pressure opening 7 is provided in the suction passage 3 at a position which is downstream of the throttle valve 4 when the valve 4 is closed but faces the end edge 4a of the throttle valve 4 when the valve 4 has been slightly opened.
  • the opening 7 and the opening 5 are connected in parallel with one another to a pressure receiving portion of the control apparatus 8 so that the control may be effected by the resultant of the negative pressures obtained at the two openings 7 and 5.
  • the negative pressure obtained at the opening 7 is considered, this is only the regular suction pressure produced behind the throttle valve 4 when the valve 4 is fully closed, but as the valve 4 is gradually opened, the opening 7 gradually senses a smaller negative pressure by being subjected to the atmospheric pressure upstream of the throttle valve 4.
  • the suction pressure sensed is so compensated that the same is much smaller in magnitude of negative pressure in response to increase of the open degree of the throttle valve as shown by curves a, b and c in FIG. 2. If, accordingly, the control is thus carried out thereby, the amount of fuel injection is increased in accordance with the increase of the open degree of the throttle valve so as to approach the line A in FIG. 2. Namely, if there is now considered the case when, for instance, the open degree of the throttle valve is 19 degrees and the engine speed is 7,000 r.p.m., the suction pressure of about 90 mm.
  • the subsidiary negative pressure opening 7 is designed to branch into two openings correspond ing to 10 degrees and 19 degrees of the degree of opening of the throttle valve, respectively, but, of course, this invention is not limited thereto.
  • the suction pressure is sensed while being compensated in response to the change of the degree of opening of the throttle valve so that the control of the fuel injection amount based thereon is effected depending on both the-suction negative pressure and the degree of opening of the throttle valve whereby the operation of the engine can be improved in comparison with the case when the control is'efi'ected only by the regular suction negative pressure.
  • the openings 5 and 7 are placed in diarnetric opposition to one another at opposite sides of the passage 3 to minimize their influence on one another.
  • Apparatus for sensing suction pressure for control of the amount of fuel injection in an internal combustion engine comprising an engine suction passage having a butterfly type throttle valve therein, the valve being movable between a closed position and open positions, said passage being provided with a main negative pressure opening situated down stream of the throttle valve and also with a subsidiary negative pressure opening situated at a location which lies downstream of the throttle valve when the valve is closed but faces the edge of the throttle valve when the valve is slightly opened and then lies upstream of the valve when it becomes increasingly opened, said main opening always remaining downstream of the throttle valve, said openings being coupled such that the negative pressures in the two openings are combined to provide a resultant negative pressure.
  • a control device regulates fuel flow to a fuel injection noule communicating with said passage, said openings being connected in parallel to said control device.

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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)
US86192A 1970-05-21 1970-11-02 Apparatus and methods for controlling the amount of fuel injected into an internal combustion engine Expired - Lifetime US3670710A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4290370 1970-05-21

Publications (1)

Publication Number Publication Date
US3670710A true US3670710A (en) 1972-06-20

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Application Number Title Priority Date Filing Date
US86192A Expired - Lifetime US3670710A (en) 1970-05-21 1970-11-02 Apparatus and methods for controlling the amount of fuel injected into an internal combustion engine

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US (1) US3670710A (fr)
CA (1) CA926242A (fr)
FR (1) FR2092257A5 (fr)
GB (1) GB1345908A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750636A (en) * 1970-12-31 1973-08-07 Honda Kk Apparatus for the control of fuel injection for an internal combustion engine
US6085736A (en) * 1999-08-18 2000-07-11 Osterhues; Mark P. Archery bow stabilizer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2063848A (en) * 1933-12-23 1936-12-08 Bosch Robert Injection internal combustion engine
US2093984A (en) * 1935-09-27 1937-09-21 Bosch Robert Speed governing apparatus for injection internal combustion engines
US2132446A (en) * 1933-12-01 1938-10-11 Bosch Gmbh Robert Speed governing apparatus for injection internal combustion engines
US2623510A (en) * 1948-10-10 1952-12-30 Bosch Gmbh Robert Governor for internal-combustion engines
US2633115A (en) * 1948-09-24 1953-03-31 British Leyland Motor Corp Control of internal-combustion engines
US2841131A (en) * 1957-02-21 1958-07-01 Gen Motors Corp Fuel metering system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2132446A (en) * 1933-12-01 1938-10-11 Bosch Gmbh Robert Speed governing apparatus for injection internal combustion engines
US2063848A (en) * 1933-12-23 1936-12-08 Bosch Robert Injection internal combustion engine
US2093984A (en) * 1935-09-27 1937-09-21 Bosch Robert Speed governing apparatus for injection internal combustion engines
US2633115A (en) * 1948-09-24 1953-03-31 British Leyland Motor Corp Control of internal-combustion engines
US2623510A (en) * 1948-10-10 1952-12-30 Bosch Gmbh Robert Governor for internal-combustion engines
US2841131A (en) * 1957-02-21 1958-07-01 Gen Motors Corp Fuel metering system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750636A (en) * 1970-12-31 1973-08-07 Honda Kk Apparatus for the control of fuel injection for an internal combustion engine
US6085736A (en) * 1999-08-18 2000-07-11 Osterhues; Mark P. Archery bow stabilizer

Also Published As

Publication number Publication date
CA926242A (en) 1973-05-15
FR2092257A5 (fr) 1971-01-21
GB1345908A (en) 1974-02-06

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