US3844263A - Supercharge-type fuel injection control system - Google Patents

Supercharge-type fuel injection control system Download PDF

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Publication number
US3844263A
US3844263A US00385340A US38534073A US3844263A US 3844263 A US3844263 A US 3844263A US 00385340 A US00385340 A US 00385340A US 38534073 A US38534073 A US 38534073A US 3844263 A US3844263 A US 3844263A
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United States
Prior art keywords
pressure
fuel
injection
supercharging
comparator
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Expired - Lifetime
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US00385340A
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English (en)
Inventor
K Endo
K Negi
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Denso Corp
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NipponDenso Co Ltd
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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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/32—Controlling fuel injection of the low pressure type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D43/00—Conjoint electrical control of two or more functions, e.g. ignition, fuel-air mixture, recirculation, supercharging or exhaust-gas treatment

Definitions

  • ABSTRACT A fuel injection control system is provided wherein the supercharging pressure in an inlet pipe is detected Forelgn Application Pnomy Data and compared with the fuel pressure by a comparator Aug. 7, Japan 1 and a pressure valve is controlled by the output of the comparator, whereby [52] 123/119 C, 123/32 123/119 the fuel pressure is increased in accordance with the 123/139 Aw supercharging pressure to reduce the ratio of the inv 1 at t at [58] held of Search 123/1 19 1 19 32 and thereby to reduce the duration of the opening of a 123/32 AB, 139 1 139 Aw fuel injection valve. In this way, it is possible to accomplish a proper fuel injection without requiring any [56] References Cited additional injection valve.
  • FIG. a
  • the present invention relates to a fuel injection control system having a supercharging function.
  • the injection time required at full load is four timesInventger'than that at idling when there is no supercharging function
  • the injection time required at full load is eight times larger than that at idling when there is a supercharging function providing a supercharging effect of l atmospheric pressure.
  • the system of this invention comprises a supercharging pressure detector for detecting the supercharging pressure in an inlet pipe which is varied by a supercharging function, a fuel pressure detector for detecting the pressure of fuel, a comparator for comparing the outputs of the detectors, a fuel pressure regulating electromagnetic valve opened and closed according to the output of the comparator to regulate the fuel pressure, and injection valve means for injecting fuel at said regulated fuel pressure, and the system thus has a very useful advantage in that the fuel pressure can be increased in accor dance with the detected supercharging pressure to reduce the value of the injection rate, i.e., the ratio between the injection time at full load and that at idling and thereby to reduce the duration of the opening of the injection valve means, whereby the injection of fuel can be effected properly without increasing the number of injection valve means.
  • system of this invention further comprises a second mechanical pressure regu' lator comprising a spring and a pressure regulator valve and arranged in parallel with the first pressure regulator to control the variation of the fuel pressure below a predetermined value, and the system of this embodiment thus has a very useful advantage in that in addition to the advantage of the first embodiment, any abnormal variation of the fuel pressure due to for example a fault in the electric circutry can be prevented.
  • FIG. 1 is a block diagram showing an embodiment of a fuel injection control system according to the present invention.
  • FIG. 2 is a characteristic diagram of the supercharging pressure detector used in the embodiment shown in FIG. 1.
  • FIG. 3 is a characteristic diagram of the compensating circuit used in the embodiment shown in FIG. 1.
  • FIG. 5 is a schematic view showing part in section the mechanical parts of the embodiment shown in FIG. I.
  • FIG. 6 is an electric wiring diagram of the compensating circuit used in the embodiment shown in FIG. I.
  • FIG. 7 is an electric wiring diagram showing the interconnections of the comparator, power amplifier and fuel pressure regulating electromagnetic valve used in the embodiment shown in FIG. 1.
  • FIG. 8 is an inlet pipe pressure versus valve opening duration characteristic diagram useful for explaining the operation of the embodiment shown in FIG. 1.
  • FIG. 9 is a supercharging pressure versus fuel pressure characteristic diagram of the embodiment shown in FIG. 1.
  • numeral 1 designates a supercharging pressure detector connected to an inlet pipe Ia connected to a supercharger which is not shown to detect the supercharging pressure in the inlet pipe la.
  • the supercharging pressure detector 1 produces its output as shown by the characteristic curve of FIG. 2 and this detected output voltage is converted in a compensating circuit 2 as shown by the characteristic curve of FIG. 3 which is predetermined in accordance with the required pressure regulations, thereby providing a reference voltage for a comparator 3.
  • Numeral 4 designates a fuel pressure detector for detecting the pressure of fuel and producing its output as shown by the characteristic curve of FIG.
  • the comparator 3 receives the outputs of the compensating circuit 2 and the fuel pressure detector 4 and uses the output of the compensating circuit 2 as its reference voltage. Consequently, when the detected voltage of the fuel pressure detector 4 becomes higher than the reference voltage by the compensating circuit 2, the comparator 3 generates an output which opens a fuel pressure regulating electromagnetic valve 6.
  • a power amplifier 5 for amplifying the output of the comparator 3 receives the output of the comparator 3 and generates an output sufficient to actuate the fuel pressure regulating electromagnetic valve 6.
  • Numeral 7 designates a fuel pump for delivering fuel from a fuel tank 8 at a high pressure into a high pressure fuel pipe 9 which is connected to the fuel pressure detector 4 and an injection valve 10.
  • the high pressure fuel pipe 9 is also connected to a first pressure regulator 11 and the fuel pump 7 and the first pressure regulator 11 is connected to a low pressure fuel pipe 12 leading to the fuel tank 8.
  • a second pressure regulator 13 of the mechanical type may be provided in parallel with the first pressure regulator 11 so that the abnormal rise of the fuel pressure may be controlled to a predetermined value by the second pressure regulator 13.
  • the pressure regulator 11 is actuated by the pressure regulating electromagnetic valve 6 and therefore the electromagnetic valve 6 is generally constructed integral with the first pressure regulator 11.
  • FIG. 5 is a schematic view showing part in section an arrangement of the mechanical parts of the embodiment shown in FIG. I and the injection valve is provided between the inlet pipe la and the high pressure fuel pipe 9.
  • the fuel pressure regulating electromagnetic valve 6 is provided in the first pressure regulator 11 and the output signal of the power amplifier 5 is applied across its input terminals 6a and 6b.
  • the second pressure regulator 13 which may be provided in parallel with the first pressure regulator 11 comprises a spring 13a and a pressure regulator valve 13b.
  • FIG. 6 is an electric wiring diagram showing one form of the compensating circuit 2 used in the embodiment shown in FIG. I and it comprises diodes 2a, 2b and 2c, capacitor 2d, resistors 2e, 2f, 2g, 2h, 2i and 2j and operational amplifier 2k.
  • the output voltage of the supercharging pressure detector 1 is applied to an input terminal 2! and a positive power supply voltage is applied across power supply terminals 2m and Zn, so that the compensation voltage shown in FIG. 3 is generated at an output terminal 20.
  • FIG. 7 is an electric circuit diagram showing an arrangement of the comparator 3, the power amplifier 5 and the fuel pressure regulating electromagnetic valve 6 used in the embodiment shown in FIG. I.
  • the output of the compasating circuit 2 is applied as the reference voltage to an inverting input terminal 3b of a voltage comparator 3a and the detected output voltage of the fuel pressure detector 4 representing the fuel pressure is applied to a noninverting input terminal 3c, whereby when the detected fuel pressure voltage becomes higher than the reference voltage, a comparator output is generated to conduct a transistor 5a of the power am plifier 5 and thus a coil 60 of the electromagnetic valve 6 by the power supply voltage applied to the power supply terminal 6b.
  • FIG. 8 showing the relationship between the pressure P in the inlet pipe Ia and the duration 'rof the opening of the injection valve 10 calculated on the basis of the fuel quantity delivered by a single injection
  • the curve b indicates the required characteristic of the duration 7 of the opening of the injection valve versus the pressure P in the inlet pipe when the fuel pressure is maintained constant and the value of the injection rate is large
  • the curve a indicates the required characteristic of the valve opening duration 1 versus the inlet pipe pressure P when the fuel pressure is increased with increase in the supercharging pressure and the value of the injection rate is small.
  • the power amplifier 5 and the fuel pressure regulating electromagnetic valve 6 when the output of the fuel pressure detector 4 or the detected fuel pressure voltage becomes higher than the output compensation voltage of the compensating circuit 2, the fuel pressure regulating electromagnetic valve 6 is operated to reduce the fuel pressure in the high pressure fuel pipe 9.
  • the operation of the fuel pressure regulating electromagnetic valve 6 is stopped. Repetitions of this process control the pressure in the high pressure fuel pipe 9 at predetermined values dependent upon the output compensation voltage of the compensating circuit 2. Accordingly, the characteristic curve shown in FIG.
  • the opening and closing operation of the fuel pressure regulating electromagnetic valve 6 is effected and therefore the pressure in the high pressure fuel pipe 9 is regulated according to the predetermined pattern.
  • a supercharge-type fuel injection control system comprising a supercharging pressure detector for detecting the supercharging pressure in an inlet pipe which is varied by a supercharging function, fuel pres sure detector for detecting the pressure of fuel to be injected, a comparator for comparing the outputs of said detectors, a fuel pressure regulating electromagnetic valve in a first pressure regulator adapted to be opened and closed in accordance with the output of said comparator to control said fuel pressure, and fuel injection valve means for injecting fuel in accordance with said regulated fuel pressure.
  • a supercharge-type fuel injection control system further comprising a second mechanical-type pressure regulator comprising a spring and a pressure regulator valve and provided in parallel with said first pressure regulator to control variation of the fuel pressure below a predetermined value.

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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)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
US00385340A 1972-08-07 1973-08-03 Supercharge-type fuel injection control system Expired - Lifetime US3844263A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47079337A JPS5143126B2 (OSRAM) 1972-08-07 1972-08-07

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US3844263A true US3844263A (en) 1974-10-29

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JP (1) JPS5143126B2 (OSRAM)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967596A (en) * 1973-04-12 1976-07-06 The Lucas Electrical Company Limited Engine control systems
US4274380A (en) * 1979-02-01 1981-06-23 The Bendix Corporation Check valve central metering injection system
DE3126393A1 (de) * 1980-07-03 1982-04-22 Lucas Industries Ltd., Birmingham, West Midlands Kraftstoffeinspritzanlage fuer einen dieselmotor
US4422420A (en) * 1981-09-24 1983-12-27 Trw Inc. Method and apparatus for fuel control in fuel injected internal combustion engines
EP0067628A3 (en) * 1981-06-04 1984-02-15 Chandler Evans Inc. Fuel metering apparatus and method
US4512152A (en) * 1981-05-09 1985-04-23 Yamaha Hatsudoki Kabushiki Kaisha Engine with supercharger
US5035223A (en) * 1989-08-15 1991-07-30 Fuji Jukogyo Kabushiki Kaisha Fuel injection control system for an internal combustion engine
US5085193A (en) * 1989-05-30 1992-02-04 Fuji Jukogyo Kabushiki Kaisha Fuel injection control system for a two-cycle engine
US5174262A (en) * 1989-04-14 1992-12-29 Brunswick Corporation Control valve for fuel injection
US5284119A (en) * 1991-07-08 1994-02-08 Walter Potoroka, Sr. Internal combustion engine fuel injection apparatus and system
US5311850A (en) * 1989-01-11 1994-05-17 Martin Tiby M High pressure electronic common-rail fuel injection system for diesel engines
US5697338A (en) * 1992-08-20 1997-12-16 Toyota Jidosha Kabushiki Kaisha Fuel injection controller for use in an internal combustion engine
US6102000A (en) * 1993-11-02 2000-08-15 Toyota Jidosha Kabushiki Kaisha Fuel injection apparatus for engine
RU2213249C1 (ru) * 2002-02-27 2003-09-27 Московский государственный открытый университет Способ управления работой электромагнитного клапана, предназначенного для дозирования газового топлива в цилиндры двигателя внутреннего сгорания
US20080059039A1 (en) * 2006-09-05 2008-03-06 Denso Corporation Method and apparatus for pressure reducing valve to reduce fuel pressure in a common rail

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1559302A (en) * 1977-01-07 1980-01-16 Gestetner Ltd Offset printing machines
JPS55103629U (OSRAM) * 1979-01-12 1980-07-19
JPH0650079B2 (ja) * 1984-05-18 1994-06-29 日本電装株式会社 燃料噴射ポンプ用電磁弁の駆動電力制御装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565482A (en) * 1944-09-07 1951-08-28 Gen Motors Corp Apparatus for controlling engine intake pressure with variable-speed blower and engine throttle
US2818847A (en) * 1942-05-15 1958-01-07 Bendix Aviat Corp Internal combustion engine control
US2841129A (en) * 1954-08-04 1958-07-01 Reggio Ferdinando Carlo Engine control system
US3705572A (en) * 1968-04-05 1972-12-12 Brico Eng Fuel injection systems for internal combustion engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2818847A (en) * 1942-05-15 1958-01-07 Bendix Aviat Corp Internal combustion engine control
US2565482A (en) * 1944-09-07 1951-08-28 Gen Motors Corp Apparatus for controlling engine intake pressure with variable-speed blower and engine throttle
US2841129A (en) * 1954-08-04 1958-07-01 Reggio Ferdinando Carlo Engine control system
US3705572A (en) * 1968-04-05 1972-12-12 Brico Eng Fuel injection systems for internal combustion engines

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967596A (en) * 1973-04-12 1976-07-06 The Lucas Electrical Company Limited Engine control systems
US4274380A (en) * 1979-02-01 1981-06-23 The Bendix Corporation Check valve central metering injection system
DE3126393A1 (de) * 1980-07-03 1982-04-22 Lucas Industries Ltd., Birmingham, West Midlands Kraftstoffeinspritzanlage fuer einen dieselmotor
US4421088A (en) * 1980-07-03 1983-12-20 Lucas Industries Limited Fuel system for compression ignition engine
US4512152A (en) * 1981-05-09 1985-04-23 Yamaha Hatsudoki Kabushiki Kaisha Engine with supercharger
EP0067628A3 (en) * 1981-06-04 1984-02-15 Chandler Evans Inc. Fuel metering apparatus and method
US4422420A (en) * 1981-09-24 1983-12-27 Trw Inc. Method and apparatus for fuel control in fuel injected internal combustion engines
US5311850A (en) * 1989-01-11 1994-05-17 Martin Tiby M High pressure electronic common-rail fuel injection system for diesel engines
US5174262A (en) * 1989-04-14 1992-12-29 Brunswick Corporation Control valve for fuel injection
US5085193A (en) * 1989-05-30 1992-02-04 Fuji Jukogyo Kabushiki Kaisha Fuel injection control system for a two-cycle engine
US5035223A (en) * 1989-08-15 1991-07-30 Fuji Jukogyo Kabushiki Kaisha Fuel injection control system for an internal combustion engine
US5284119A (en) * 1991-07-08 1994-02-08 Walter Potoroka, Sr. Internal combustion engine fuel injection apparatus and system
US5697338A (en) * 1992-08-20 1997-12-16 Toyota Jidosha Kabushiki Kaisha Fuel injection controller for use in an internal combustion engine
US6102000A (en) * 1993-11-02 2000-08-15 Toyota Jidosha Kabushiki Kaisha Fuel injection apparatus for engine
RU2213249C1 (ru) * 2002-02-27 2003-09-27 Московский государственный открытый университет Способ управления работой электромагнитного клапана, предназначенного для дозирования газового топлива в цилиндры двигателя внутреннего сгорания
US20080059039A1 (en) * 2006-09-05 2008-03-06 Denso Corporation Method and apparatus for pressure reducing valve to reduce fuel pressure in a common rail
US7848868B2 (en) * 2006-09-05 2010-12-07 Denso Corporation Method and apparatus for pressure reducing valve to reduce fuel pressure in a common rail

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Publication number Publication date
JPS5143126B2 (OSRAM) 1976-11-19
JPS4935724A (OSRAM) 1974-04-02

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