US3750633A - Electronic governor for fuel-injection type internal combustion engines - Google Patents

Electronic governor for fuel-injection type internal combustion engines Download PDF

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Publication number
US3750633A
US3750633A US00122473A US3750633DA US3750633A US 3750633 A US3750633 A US 3750633A US 00122473 A US00122473 A US 00122473A US 3750633D A US3750633D A US 3750633DA US 3750633 A US3750633 A US 3750633A
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United States
Prior art keywords
engine
circuit
fuel
regulating rod
fuel regulating
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Expired - Lifetime
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US00122473A
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English (en)
Inventor
Y Ohtani
T Kakijiama
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Bosch Corp
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Diesel Kiki 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
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/007—Electric control of rotation speed controlling fuel supply
    • F02D31/009—Electric control of rotation speed controlling fuel supply for maximum speed control

Definitions

  • ABSTRACT 2 122,473 An electronic governer for fuel-injection type internal 7-7m v r combustion engines in which the speed regulation and Foreign Application Priority Data un Morgan" effect may be achieved by means of control Mar, 4 7 Jap n 45 R121 5 circuit and un Eisen setting circuit, and there may be obtained a stable engine output characteristic for the [52] U.S. Cl 123/102, 123/140 MC full range of engine speeds from the lowspeed to the [51 Int. Cl.
  • F02d 11/10 highspeed by providing anti-overrun circuit and antii58l Field 01 Search 123/32 15A, 102, 140 MC, hunting circuit, 110 that the possibility of hunting under l23/I3) E iow-spced'opcrating conditions is completely avoided.
  • Electronic circuits in governors of this type have heretofore produced an output current for actuating an electromagnetic mechanism to control the fuel regulating rod, according to whose position the fuel injection pump delivers more or less fuel to the engine.
  • Said output current is produced by first applying the output voltage of an oscillating circuit to a monostable multivibrator of a known type.
  • Said oscillator consists of a capacitor and a variable inductance whose inductance value corresponds to the position of the accelerator lever.
  • the output voltage of said multivibrator is then integrated by an integrating circuit and comes out as a DC voltage.
  • a signal is generated by an electromagnetic mechanism coupled to the rotating shaft of the fuel injection pump.
  • This signal corresponding to the rotational speed of the engine, is applied to a monostable multivibrator of a known type, whose output voltage is then integrated by an integrating circuit and therewith converted into a DC voltage.
  • This DC voltage is compared against the other DC voltage mentioned above to produce the afore-mentioned output current, which is proportional to the difference between said two DC voltages and which is used to actuate the electromagnetic mechanism as stated.
  • the former DC voltage' is proportional to the frequency of the oscillating circuit
  • the latter DC voltage is proportional to the rotational speed of the engine, so that the resultant control output current as a function of the rotational speed of engine generally takes a constant gradient over the entire range of engine speeds.
  • the speed regulation of the engine is constant for the entire speed range from lowspeed region to high-speed region.
  • the regulation in the low-speed region needs to be set relatively high with a view to preventing the engine from hunting. Because of this requirement, it has been proposed to feed integrated pulse signals from the input and output of said monostable multivibrator to a differential amplifier circuit in order to change the degree of conduction through a transistor according as the output voltage of said differential amplifier stays below or rises above a certain fixed value, whereby the speed regulation for the low-speed region will differ from that for the high-speed region, but such circuits have failed to satisfy the requirement fully.
  • An object of this invention is to provide an improved electronic governor for fuel-injection type internal combustion engines including a circuit means by which the frequency of oscillator circuit is caused to change in accordance with the displacement of fuel regulating rod, thereby expanding the speed regulation for the low-speed range of the engine in order to avoid engine hunting" when the engine is running in that range of speeds.
  • Another object of this invention is to provide an improved electronic governor for fuel-injection type internal combustion engines including a circuit means which is connected in parallel with the comparison circuit for comparing the output voltage of the oscillator circuit with another output voltage proportioned to the rotational speed of the engine, and which is arranged to produce an output signal in proportion to the rotational speed of the engine or the position of accelerator lever, the output voltage of which is superimposed on the output voltage of the comparison circuit thereby obtaining the unrete" effect.
  • a further object of this invention is to provide novel and improved electronic governor for fuel-injection type internal combustion engines in which the speed regulation and un Eisen effect may be achieved by means of a control circuit and un Eisen" setting circuit, and there may be obtained a stable engine output characteristic for the full range of engine speeds from the lowspeed to the highspeed by providing antioverrun circuit and anti-hunting circuit, so that the possibility of hunting under low-speed operating conditions is completely avoided.
  • FIG. 1 is a block diagram for an electronic governor according to this invention for fuel-injection type internal combustion engines
  • FIG. 2 is a circuit diagram representing a preferred embodiment of this invention.
  • FIG. 3 is a graph showing the output curves derived from the circuit of FIG. 2'
  • FIG. 4 is similar to the graph of FIG. 3 but refers to a conventional electronic circuit
  • FIG. 5 is a longitudinal cross section showing a control section according to this invention as installed on a fuel injection pump
  • FIGS. 6 and 7 both graphs showing output curves available from the electronic circuit arranged to this invention.
  • A is a constant-voltage circuit.
  • Output voltage of oscillator circuit 8" is passed onto Schmitt circuit C, and is then fed through differential circuit D" and detector circuit E” to monostable multivibrator circuit F.
  • Said multivibrator circuit F delivers its output voltages to voltage comparison circuit l-I," on the one hand, through integrating circuit G and to feedback circuit 1 on the other hand.
  • Output voltage of circuit I is fed back to said oscillator circuit B.
  • converter circuit I(" is amplified by amplifier circuit L” and is led to monostable multivibrator circuit 0" through differential circuit "M” and detector circuit N.
  • Multivibrator circuit 0 gives its output voltage to said voltage comparison circuit I-I" through integrating circuit P," and outputvoltage of comparison circuit H is fed to fuel regulating rod control circuit R through amplifier circuit Q.”
  • the other output voltage developed by integrating circuit P" is led to said circuit 0" through unrete" set ting circuit T.”
  • the other output voltage of electromagnetic rotary voltage converter circuit K"' is led to said fuel regulating rod control circuit R through an- 4 ti-overrun circuit 8.
  • the signal emerging from circuit R is fed back to said converter circuit K through the engine U.
  • a closed loop is formed by these component circuits.
  • T, through T are transistors; D, through D,,, diodes; C, through C capacitors; R, through R resistors; VR, through VR-,, variable resistors; VL,, a variable inductance associated with the position of accelerating lever of the internal combustion engine; VL a variable inductance associated with the position of fuel regulating rod, VL a movable coil in fuel regulating rod control mechanism for moving the fuel regulating rod of the fuel injection pump in accordance with the output current produced by the electronic circuit network; r,, a relay; 1, a positive conductor; and 2, a negative conductor.
  • Circuit A is a known constant-voltage circuit using a Zener diode and utilizing the Zener characteristic.
  • Circuit B is an oscillator including transistor T resistors R through R variable inductance VL and capacitors C C
  • the oscillating frequency is varied by varying the inductance of VL,, whose coil has a core. This variation is accomplished by coupling said core to the accelerator lever.
  • the sinusoidal output voltage of oscillator 8" is led to Schmitt circuit C comprising transistors T T and resistors R, through R and is changed thereby to a square-wave pulse signal.
  • Differenctial circuit D formed by resistor R, and capacitor C forms, out of the square-wave signal coming from circuit C, a trigger pulse signal, which enters detector circuit E to be changed thereby to a negative trigger pulse signal.
  • This negative trigger pulse signal is transformed into a consta'nt-width square-wave pulse signal by monostable multivibrator circuit F" comprising transistors T T load resistorsR R bias resistor R,,,; base resistor R,,,; time-constant setting resistor R and capacitor C
  • the output signal of .multivibrator F undergoes integration in integrating circuit G comprising resistor R and capacitor C and comes out of circuit-G as a DC voltage proportional to the pulse density representing the position of the accelerator lever. This DC voltage is fed into one of the inputs of comparison circuit H.
  • Electromagneticrotary voltage converter circuit K comprises an assembly of permanent magnet 3 and detector coils 3a, 3b, which is located close to a toothedwheel magnetic body 4a coupled to injection-pump camshaft 4. Rotation of body 40 induces voltage in detector coils 3a, 3b wound on permanent magnet 3 as the teeth or peripheral protrusions of body 4a move in succession past the permanent magnet.
  • Circuit 0 is constituted by transistors T T load resistors R R bias resistor R base resistor R capacitor C time-constant setting resistor R and capacitor C
  • the output signal of multivibrator 0" is finally converted into a DC voltage proportional to the rotational speed of the engine by integrating circuit P" having resistor R and capacitor C,,.
  • This DC voltage is the other input signal of said voltage comparison circuit
  • iHIDS Comparison circuit H is constituted by transistors T T resistors R through R and R through R and variable resistor VR Emitters of transistors T and T are both connected to negative conductor 2 through resistor R Transistor T, has its collector connected to positive conductor 1.
  • Transistor T has its collector connected to positive conductor 1 through resistor R Resistors R R and variable resistor VR serve as a bias resistance for use in setting the operating point of transistor T changing ohmic value of VR for adjustment changes the operating point tochange the rotational speed of the engine in idling condition.
  • the output signal of said oscillator circuit B varying with variable inductance in this circuit, applies to the base of transistor T to switch on this transistor, thereby admitting current into resistor R Consequently, the potential of the emitter of transistor T rises in proportion to the voltage change representing a displacement of said accelerator lever, thereby making transistor T less conductive than before.
  • the amount of air the engine draws for each intake stroke of the piston decreases as the rotational speed of engine rises, and means the automatic action calculated to decrease or lower the maximum fuel supply to the engine cylinders progressively from low to high over the range of engine speeds.
  • Detector coil VL. for sensing the position of fuel regulating rod is electrically connected in series to coil VL of oscillator circuit B," and the core of this coil is mechanically connected with fuel regulating rod 5 as shown in FIG. 5.
  • a change in inductance of detector coil VL therefore affects the oscilating frequency of circuit "B.”
  • the fuel regulating rod will rock to and fro; in this rocking motion, suppose the fuel regulating rod displaces itself in the direction for increasing fuel supply.
  • the oscillator frequency will then rise in circuit 8" to increase the current flowing in movable coil VL in the injection-pump fuel regulating rod control mechanism, so that the fuel regulating rod 5 displaces subsequently in the direction for increasing supply.
  • the output current of power transistor T used in said control circuit "R” is derived from the difference in output voltage between transistors T, and T in comparison circuit l-l.” Therefore, assuming a given position of accelerator lever, a rise in rotational speed of engine due to a fall in engine load will move fuel regulating rod 5 in the direction for decreasing fuel supply, causing the core to be pushed into said coil VL, and thereby increasing its inductance.
  • the output voltage of monostable multivibrator circuit F is integrated by means of resistor R and capacitor C and the integrated voltage signal is applied to the input of transistor T
  • This input voltage varies with the position of the accelerator lever, so that, as the lever is moved in the direction for increasing fuel supply, the base potential of transistor T, rises to switch on this transistor. According as transistor T is more or less conductive, transistor T similarly conducts more or less to decrease the current flowing in coil V1. thus eliminating the feedback signal.
  • moving the accelerator lever in the direction for decreasing fuel supply the base potential of transistor T, falls to switch off this transistor and also transistor T so that a current flows in coil VL, to lntroduce a feedback signal.
  • Anti-overrun circuit S will next be considered.
  • This circuit is a known Schmitt circuit, whose input receives voltage from coil 3b of electromagnetic rotary detector circuit K.” With the power-source voltage applying between positive conductor 1 and negative conductor 2, transistor T becomes conductive on ac-- count of dividers R and R to energize the coil of relay r connected to the collector of transistor T This energization closes, in relay r,, contact r which is connected to the input side of movable coil VL, in the fuel regulating rod control mechanism.
  • variable resistor VR When it is desired to increase the engine output power during normal operation, the usual practice is to move the accelerator.
  • the accelerator lever of oscillator circuit B When the accelerator lever of oscillator circuit B is moved to change the inductance of VL, the excitation current flowing in movable coil VL increases, so that the fuel regulating rod will move in the direction until point 8;, (FIG. 7') is reached.
  • the setting of variable resistor VR is to be brought down to a lower value to obtain a modified characteristic curve represented by the dotted line VR',.
  • the line VR is to be repositioned to shift the gradient of the curve to the dotted line VR',,, and the line VR is to be repositioned to bring the operating point to the dotted line VR 7
  • the excellence of the governor according to this invention will be noted to lie in that the governor permits both thespeed regulation and the "unrete" effect to be adjusted, includes a new and anti-overrun circuit and an anti-hunting circuit and therefore assues a stable engine output characteristic for the full range of engine speeds from the lowspeed to thev high-speed region, and that the governor in given an added function of completely eliminating the possibility of hunting under low-speed operating conditions.
  • An electronic governor for a fuel-injection type internal combustion engine comprising variable frequency oscillator means for producing a first, reference signal, means for generating asecond, d.c. voltage signal related to the rotational speed of the engine, comparison circuit means for comparing the signal produced by said oscillator means and said d.c.
  • fuel regulating rod control means for controlling the displacement of the fuel regulating rod
  • means including a power amplifier circuit, for connecting the control signal output of said comparison circuit means to said fuel regulating rod control means, and feedback circuit means responsive to the position of the fuel regulating rod for controlling the frequency of said variable frequency oscillator circuit means in accordance with the displacement of the fuel regulating rod
  • said power amplifier circuit including means for setting the speed regulation provided by the governor and said governor further comprising means responsive to a signal related to? said d.c. voltage signal for decreasing the current output of said power amplifier-circuit in response to an in crease in the rotational speed of the engine so as to am tomatically decrease the fuel supply to the engine prog-j,
  • An electronic governor for a fuel-injection type internal combustion engine comprising variable frequency oscillator means for producing afirst, reference signal, means for sensing engine rotational speedand for generating a second, d.c. voltage signal the magnitude of which is related to the rotationalspeed of the engine, comparison circuit means for comparing said first signal produced by said oscillator means and said d.c.
  • electromagnetic fuel regulating rod control means for controlling the displacement of the fuel regulating rod
  • circuit means responsive to the position of the fuel regulating rod for controlling the frequency of said variable frequency oscillator circuit means in accordance with the displacement of said fuel regulating rod
  • antioverrun circuit means for providing a stable engine output characteristic over the full engine speed range and comprising relay means responsive to said dc.
  • said connecting means including power amplifier circuit means including means for setting the speed regulation provided by the governor, and said governor further comprising means responsive to a signal related to said d.c. voltage signal for decreasing the current output of said power amplifier circuit means in response toan increase in the rotational speed of the engine so as to automatically decrease the fuel supply to the engine progressively from low to high over the engine speed range.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Control Of Velocity Or Acceleration (AREA)
US00122473A 1970-03-14 1971-03-09 Electronic governor for fuel-injection type internal combustion engines Expired - Lifetime US3750633A (en)

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JP45021215A JPS4946003B1 (en, 2012) 1970-03-14 1970-03-14

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886921A (en) * 1971-04-26 1975-06-03 Daimler Benz Ag Electronic control system for the velocity of a machine element
US3967603A (en) * 1973-05-22 1976-07-06 Roger Jean Habert Speed sensitive switching device
US4177516A (en) * 1977-02-15 1979-12-04 Shaw Gmc Trucks Ltd. Electronic digital governor
US4212279A (en) * 1977-07-15 1980-07-15 Diesel Kiki Co., Ltd. Electronic-mechanical governor for diesel engines
US4270502A (en) * 1978-06-10 1981-06-02 Lucas Industries Limited Fuel injection pumping apparatus
US4854282A (en) * 1986-10-29 1989-08-08 Robert Bosch Gmbh Device for securing control magnets on injection pumps for diesel fuel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3372680A (en) * 1965-02-11 1968-03-12 Bosch Gmbh Robert Time control circuit for fuel injection system
US3575256A (en) * 1969-02-12 1971-04-20 Ford Motor Co Speed control system for an automtoive vehicle
US3587540A (en) * 1968-07-25 1971-06-28 Bosch Gmbh Robert Rpm regulating system for internal combustion engines operating on injected fuel
US3630177A (en) * 1968-10-12 1971-12-28 Bosch Gmbh Robert Speed control for internal combustion engine
US3659571A (en) * 1969-03-08 1972-05-02 Bosch Gmbh Robert Electronic speed regulating arrangement for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3372680A (en) * 1965-02-11 1968-03-12 Bosch Gmbh Robert Time control circuit for fuel injection system
US3587540A (en) * 1968-07-25 1971-06-28 Bosch Gmbh Robert Rpm regulating system for internal combustion engines operating on injected fuel
US3630177A (en) * 1968-10-12 1971-12-28 Bosch Gmbh Robert Speed control for internal combustion engine
US3575256A (en) * 1969-02-12 1971-04-20 Ford Motor Co Speed control system for an automtoive vehicle
US3659571A (en) * 1969-03-08 1972-05-02 Bosch Gmbh Robert Electronic speed regulating arrangement for internal combustion engines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886921A (en) * 1971-04-26 1975-06-03 Daimler Benz Ag Electronic control system for the velocity of a machine element
US3967603A (en) * 1973-05-22 1976-07-06 Roger Jean Habert Speed sensitive switching device
US4177516A (en) * 1977-02-15 1979-12-04 Shaw Gmc Trucks Ltd. Electronic digital governor
US4212279A (en) * 1977-07-15 1980-07-15 Diesel Kiki Co., Ltd. Electronic-mechanical governor for diesel engines
US4270502A (en) * 1978-06-10 1981-06-02 Lucas Industries Limited Fuel injection pumping apparatus
US4854282A (en) * 1986-10-29 1989-08-08 Robert Bosch Gmbh Device for securing control magnets on injection pumps for diesel fuel

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JPS4946003B1 (en, 2012) 1974-12-07

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