US3669080A - Electronic control system for internal combustion engine injectors - Google Patents

Electronic control system for internal combustion engine injectors Download PDF

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Publication number
US3669080A
US3669080A US9329A US3669080DA US3669080A US 3669080 A US3669080 A US 3669080A US 9329 A US9329 A US 9329A US 3669080D A US3669080D A US 3669080DA US 3669080 A US3669080 A US 3669080A
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US
United States
Prior art keywords
flop
flip
transistor
uni
condenser
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Expired - Lifetime
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US9329A
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English (en)
Inventor
Louis A Monpetit
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.)
Societe des Procedes Modernes dInjection SOPROMI
Original Assignee
Societe des Procedes Modernes dInjection SOPROMI
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Publication date
Priority claimed from FR6903274A external-priority patent/FR2031364A6/fr
Application filed by Societe des Procedes Modernes dInjection SOPROMI filed Critical Societe des Procedes Modernes dInjection SOPROMI
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Publication of US3669080A publication Critical patent/US3669080A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02D41/3005—Details not otherwise provided for

Definitions

  • a uni-junction transistor is grounded through one base while the other base is subjected to a voltage varying in accordance with the operation of the engine and defining the actually desired duration of injection. This duration is thereby brought to an end by thedischarge of a condenser fed by the flip-flop and connected with the emitter of the uni-junction transistor while an auxiliary transistor transmits the voltage of the discharged condenser to the flip-flop to return the latter to its prior condition.
  • the starting of the injection is then triggered by a pulse fed to the control electrode of one of said semi-conductor elements, which pulse is formed by generating means associated with the rotation of the engine, while the end of the injection is controlled by a second pulse produced by delay means provided with a plurality of independent inputs.
  • Said delay means is constituted in this prior art by a uni-junction transistor theemitter of which is connected with a resistance and a condenser which latter is charged with a predetermined voltage through said resistance, whereas the two bases of said uni-junction transistor are supplied with a further voltage so that the'second pulse is triggered when the two voltages are equal, except for a welldefined proportionality factor.
  • the duration of injection is adjusted by causing the time elapsed between the first actuating pulse starting the injection andthe second pulse stopping said injection to vary. This is obtained essentially by adjusting the resistance connected with the emitter of the uni-junction transistor while an auxiliary adjustment is obtained by modifying the voltage applied to the base No. 2 of said transistor.
  • the present invention has for its object to eliminate these drawbacks and more particularly it covers delay means cooperating with a bistable flip-flop associated with a unijunction transistor or an equivalent semi-conductor system, the base No. l'of which is grounded while its base No. 2 is fed with a variable voltage, the value of which is controlled by the operative parameters of the engine.
  • the emitter of said unijunction transistor is connected through one or more resistances with the junction point connecting the resistance with the condenser charged through said resistance and the bistable flip-flop when the latter is in the ON state.
  • Said bistable flip-flop switched to the OFF state by means of a transistor, the collector of which is connected with a suitable point of the bistable flip-flop while its emitter is connected with the emitter of the uni-junction transistor and its base is connected with said connecting point between the condenser and its charging resistance.
  • the invention may be further developed by connecting a diode between the bistable flip-flop and the resistance-andcondenser circuit in order to eliminate any modification in the duration of the injection produced by a modification in the frequency of operation. 7
  • said diode is constituted by a constant current diode or by any other equivalent arrangement.
  • FIG. 1 is an overall diagram of the fuel injection system.
  • the circuit has a pressure regulating discharge valve 6 and if necessary a mechanical or pneumatic back pressure accumulator 11.
  • the electrical and electronic circuitry is fed by a source of energy, generally the storage battery 13, which itself is connected in a conventional manner to a generator 14 by way of a conventional regulator 15.
  • the power may be connected to the electronic circuitry by switch 16. This switch may be operated independently or it may be connected to the switch furnishing the power for the motor ignition.
  • the control means 12 receives information regarding the angular position of the motor from a device 17 and transmits orders in the form of current pulses, to the injectors 7 to 10 by way of the distributor 18, which itself is made dependent on the angular position of the motor by the device 19.
  • Devices 17 and 18 thus constitute distributing means for synchronizing the time of operation of each of the high speed injectors to a corresponding predetemtined angular position of the crank shaft.
  • the control device 12 delivers current pulses which have a fixed amplitude and a width varying linearly with the manifold pressure, through the distributing means 18 according to a signal furnished by a device 20.
  • the manifold pressure is hereinafter called the fundamental regulatory parameter.
  • the control means 12 a bistable flip-flop, is constituted by an n-p-n transistor T705 and'a p-n-p transistor T710.
  • the collector of T705 is fed by a supply of voltage V through the resistances 707 and 706, while its emitter is grounded.
  • the second transistor T 710 is connected through its emitter with the supply of voltage V,,, while its collector is connected wi h the base of the transistor T705 through the resistances 714a and 715, further resistances 854 and 714 being provided for grounding respectively the base of the transistor T705 and the point connecting said resistances 714a and 715.
  • the base of the transistor T710 is connected with the connecting point between the resistances 706 and 707, said lastmentioned point fonns also the point E adapted to feed the negative pulse triggering the bistable flip-flop.
  • the collector of the transistor T710 is connected with a condenser 806 through the diode 856 and the resistance 802.
  • the uni-junction transistor T805 is grounded through its base No. 1 while its base No. 2 is fed by a supply V with a voltage which varies with the operative parameters as described in U.S. Pat. No.
  • the emitter of said uni-junction transistor T805 is connected through the resistances 802a and 802b with the point connecting the condenser 806 with its loading resistance 802. Furthermore a transistor T855 is provided, the collector of which is connected with the point joining the resistances 714,714a and 715 through the diode 857 while its emitter is connected with the emitter of the uni-junction transistor T805, and its is connected with the point connecting the resistances 802a and 802b.
  • the p-n-p transistor T710 becomes conductive and consequently a positive voltage is applied on the base of n-p-n transistor T705 so that it becomes conductive as well.
  • the voltage at the point E and consequently on the base of the transistor T710 is held at a value lower than that of the supply voltage V and thereby the transistor T710 remains conductive as does the transistor T705.
  • the point S on its collector is practically at the voltage V so that the condenser 806 is charged through the diode 856 and the resistance 802.
  • the diode 856 prevents the time required for charging the condenser 806 from varying with the frequency of operation of the arrangement by preventing the complete discharge of said condenser 806 through the resistances 802, 714a, 714 between injection intervals.
  • the condenser 806 therefore remains charged at a very low voltage corresponding to the voltage drop in the transistor T855 and the uni-junction transistor T805 after each end of injection signal.
  • Said diode 856 may be replaced by a constant current diode or the like means such as transistors operating as generators under constant current conditions.
  • the emitter of the uni-junction transistor T805 is always subjected to the same voltage as the condenser 806 by reason of the connection provided by the resistances 802a, 802b but at the moment at which said voltage is equal to the voltage V applied to the base No. 2 of the single junction transistor T805, with proportionality factor n, said uni-junction transistor T805 becomes suddenly conductive and causes the condenser 806 to be discharged.
  • the voltage on the base of the transistor T855 is higher than that prevailing on its emitter so that said transistor becomes conductive.
  • the arrangement according to the present invention operates with values of the voltage V ranging between zero and the voltage of the supply V It is therefore an easy matter to act on the voltage V with a view to modifying the duration of injection between zero and infinity without any difficulty while an intense negative pulse is obtained for the return of the flip-flop provided a potentiometric voltage-divider is connected in the circuit discharging for condenser 806 in a manner such that the voltage applied to the emitter of the unijunction transistor T805 may be V,; n V
  • an electronic system for controlling the duration of fuel injection in an internal combustion engine of the type including a bistable flip-flop, for starting a fuel injection period when switched from a first stable state to a second stable state in response to a pulse depending on a parameter associated with the operation of the engine and for terminating the fuel injection period when switched back to said first stable state, and delay means, for determining the duration of the injection period, including a uni-junction transistor provided with two bases and an emitter, one base of the uni-junction transistor being connected to a common point and the second base of said uni-junction transistor being supplied with a voltage defined by an operative parameter of e engine; a condenser having one terminal connected to the emitter of the uni-junction transistor, and the other terminal connected to said common point; a first resistance connected between the flip-flop and the one temtinal of said condenser; and a voltage source for charging the condenser when the flip-flop is switched to the second state, the improvement comprising:

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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)
US9329A 1969-02-12 1970-02-06 Electronic control system for internal combustion engine injectors Expired - Lifetime US3669080A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6903274A FR2031364A6 (enrdf_load_stackoverflow) 1966-04-13 1969-02-12

Publications (1)

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US3669080A true US3669080A (en) 1972-06-13

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US9329A Expired - Lifetime US3669080A (en) 1969-02-12 1970-02-06 Electronic control system for internal combustion engine injectors

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US (1) US3669080A (enrdf_load_stackoverflow)
JP (1) JPS4928845B1 (enrdf_load_stackoverflow)
SE (1) SE346587B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260333A (en) * 1978-03-01 1981-04-07 Robert Bosch Gmbh Method and apparatus for controlling a fuel injection system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5395398U (enrdf_load_stackoverflow) * 1976-12-30 1978-08-03

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260333A (en) * 1978-03-01 1981-04-07 Robert Bosch Gmbh Method and apparatus for controlling a fuel injection system

Also Published As

Publication number Publication date
JPS4928845B1 (enrdf_load_stackoverflow) 1974-07-30
SE346587B (enrdf_load_stackoverflow) 1972-07-10

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