US3736910A - Control circuit for controlling a fuel injecting system - Google Patents

Control circuit for controlling a fuel injecting system Download PDF

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Publication number
US3736910A
US3736910A US00165797A US3736910DA US3736910A US 3736910 A US3736910 A US 3736910A US 00165797 A US00165797 A US 00165797A US 3736910D A US3736910D A US 3736910DA US 3736910 A US3736910 A US 3736910A
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transistor
circuit
control
resistor
bistable
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L Raff
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off

Definitions

  • a monostable multivibrator provides pulses synchronously with the rotational speed of the engine for the purpose of determining the opening duration of the injection valves as a function of at least one operating parameter, particularly the intake manifold pressure.
  • a first electronic circuit operable only when the throttle valve is closed, inhibits the pulses when the engine is above an upper limit, and switches the pulses back on when the engine speed is below a lower limit which is above the idling speed.
  • a second electronic circuit which is operable at all positions of the throttle, serves to switch off the pulses when the engine speed is above a maximum value, and then switches the pulses back on when the speed drops below this maximum value.
  • the present invention relates to a control arrangement for controlling at least one group of simultaneously actuated electromagnetic injection valves in an internal combustion engine.
  • the control arrangement has at least one switching transistor for actuating the injection valves, and is provided with a monostable multivibrator which is, in turn, actuated synchronously with the rotational speed of the crank shaft.
  • the monostable multivibrator provides pulses for determining the opening duration of the injection valves as a function of at least one operating parameter as, for example, the intake manifold pressure or vacuum of the engine.
  • control arrangement of these species possessed two deficiencies which become noticeable under particular operating conditions of the engine.
  • fuel is further injected so that the braking effect is diminished, and unnecessary quantities of injurious gases are emitted.
  • the gas pedal or accelerator is fully depressed, the maximum engine speed becomes exceeded when driving downhill, since a considerable amount of fuel is injected under this condition.
  • a bistable multivibrator was provided with two RC networks which close or cut off the fuel injection above an upper limit of the engine speed. First when the engine speed drops back to a value below a lower speed limit, can fuel again be injected.
  • a centrifugal governor when the maximum speed of the engine is exceeded.
  • a first electronic circuit which is operable only when the throttle valve is closed.
  • This first electronic circuit -serves to switch off or inhibit the transmission of pulses for the fuel injection valves when the engine speed is above an upper speed limit.
  • the pulses are again switched on or allowed to be transmitted when the engine speed drops below a lower limit which is, however, above the idling speed.
  • a second electronic circuit which operates at all throttle positions, serves to switch off or inhibit the transmission of the pulses when the engine speed is above a maximum value. This circuit then allows the pulses to be switched back on when the engine speed drops below this maximum speed limit.
  • The-control arrangement in accordance with the present invention, can be designed through different embodiments.
  • The-control arrangement has two electronic circuits which serve to close the injection valves.
  • One of the electronic circuits is operable when the engine is used for braking purposes, and the second electronic circuit is operable when'the maximum engine speed is exceeded. It is possible to also apply the present invention in control arrangements which are more complex than the arrangements discussed above.
  • the first electronic circuit possesses a switching hysteresis
  • the second electronic circuit does not possess such switching hysteresis.
  • engine braking is made possible when the accelerator is in its un-depressed position.
  • a speed limiting is applied without braking effects.
  • the second electronic circuit must not possess any switching hysteresis under any conditions, since such hysteresis effects could prove dangerous under conditions of passing on a highway.
  • the valves are actuated through the use of at least one switching transistor.
  • a monostable multivibrator is driven synchronously with the crank shaft rotation through a cam and switch arrangement.
  • the multivibrator provides pulses which determine the opening duration of the injection valves as a function of at least one operating parameter, preferably the intake manifold vacuum pressure.
  • a first electronic circuit is provided which is operable only when the throttle of the engine is closed. This first circuit serves to switch off or inhibit transmission of the pulses from the multivibrator when the engine speed is above an upper limit.
  • a second electronic circuit which is operable or effective for all throttle positions, switches the pulses off when the maximum permissible engine speed is exceeded. When the speed drops again below this maximum limit, the pulses are again switched on.
  • FIG. 1 is an electronic circuit diagram and shows the arrangement of the components and their interconnections for carrying out one embodiment of the present invention.
  • FIG. 2 is an electronic circuit diagram and shows the components and their interconnections for carrying out a second embodiment of the present invention.
  • the pulse generator consists of a switch 17 and of a monostable multivibrator 16.
  • the switch 17 is operated in synchronism with the rotation of the engine by a cam 88, which is turned by the crank shaft 32, as shown by the broken line 89.
  • the monostable multivibrator 16 includes two transistors 18 and 19, which have the respective load resistors 22 and 23. These two transistors are mutually coupled together by a resistor 21 and by a transformer 24 so as to obtain the desired monostable operation.
  • the switch 17 is open, the monostable multivibrator 16 is in the stable state, the transistor 18 being conductive and the transistor ll9 being cut off.
  • a first connecting terminal 67 which is connected to the collector of the transistor 19, is at the voltage of the positive rail 66.
  • the monostable multivibrator 16 When the switch 17 is momentarily closed, the monostable multivibrator 16 is triggered to the unstable state.
  • the length of time of the unstable state depends on the amount of mutual inductance between the two windings of the transformer 24.
  • the mutual inductance can be varied by shifting the movable iron core 25 of the transformer.
  • the iron core 25 is shifted in dependence on the intake manifold pressure by a pressure box 83 that is coupled to the iron core by a rod that is symbolized by the broken line 91. In this way it is possible to vary the length of the fuel injection pulses in dependence on the intake manifold pressure, so that with an open throttle valve 85 more fuel is injected.
  • the output pulses of the multivibrator 16 are strengthened in the amplifier l and then conducted directly to the switching transistor 11.
  • the purpose of these passive networks is to determine certain limiting engine speeds, the purpose of the triggered circuits being to prevent the pulses from the multivibrator 116 from being conducted to the switching transistor 11 when these limiting speeds are exceeded. Since both of the triggered circuits 45 and 46 have the same purpose, it is possible to omit one transistor and to use the transistor 48 in both of the circuits 415 and 416.
  • the first bistable triggered circuit 45 includes a first transistor 47 and a second transistor 48 respectively having the load resistors 49 and 55.
  • the resistor 55 connects the base of the transistor 48 to the collector of the transistor 47, and the resistor 51 connects the base of this transistor to the collector of the transistor 48.
  • the resistors 56, 57, and 58 constitute a base voltage divider for the transistor 43, the base of this transistor and the resistor 52 being connected to the junction between the resistors 56 and 57.
  • An RC network composed of the resistor 59 and the capacitor 60, is connected in parallel with the resistor 57.
  • a pulse conductor 73 connects the junction between the resistors 57 and 58 to the collector of resistor 19 of the monostable multivibrator 16. This collector is the output of the multivibrator.
  • the base of the first transistor 47 is connected to the positive voltage supply line 66 by way of the series circuit containing the diode 411i and two resistors 4ll and 42.
  • the junction between the resistors 41 and 42 can be connected to the negative voltage supply line 65 through a switch 39.
  • This switch 39 is actuated through the gas pedal 84, or accelerator 84, as indicated through the broken line 86.
  • the switch 39 is closed when the gas pedal or accelerator is in its un-actuated or un-depressed position.
  • the base of the first transistor 47 is, aside from this, connected to a third terminal 68 through a diode 37. This terminal 68 serves as a connecting terminal for the first passive network 30.
  • This first passive network 30 has three terminals 67, 68 and 69.
  • the first terminal 67 is connected to the collector of the transistor 19.
  • the second terminal is, as already described, connected to the base of the first transistor 47, through the diode 37.
  • the third terminal 69 is connected to the negative voltage supply line 65.
  • the first terminal 67 leads to the second terminal 68, through the series circuit containing the first charging resistor 29 and a first capacitor 36.
  • the junction 71 between the first charging resistor 29 and the first capacitor 36 is connected to the third terminal 69, through the series circuit containing a diode 34, a second capacitor .32, and a second charging resistor 31.
  • the junction 72 between the diode 34 and the second capacitor 32 leads to the junction 71 through a third charging resistor 33. This junction 72 also leads to the second terminal 68 through a fourth charging resistor 35.
  • the collector of the first transistor 47 also leads to the junction between the second charging resistor 31 and the second capacitor 32, through a resistor 53.
  • the components of the second passive network 30' differ from those of the first passive network 30, only in their component values. Otherwise, the arrangement is the same. However, no corresponding resistor is provided for the element 53. This resistor must be omitted in the second passive network, since it gives rise to switching hysteresis.
  • the second bistable circuit stage 46 is a simplified version of the first bistable switching stage 45, since the switch 39 actuated by the gas pedal or accelerator, is omitted.
  • the third transistor 47 has a resistor 49 which is connected between the collector of this transistor 47 and the positive voltage supply line 66.
  • the two diodes S0 and 50' decouple the transistor 47 from the transistor 47.
  • the collector of the second transistor 48 is coupled to the base of the third transistor 47', through a resistor 51.
  • the transistor 18 within the control multivibrator 16 conducts
  • the transistor 19 is non-conducting.
  • the collector of the transistor 19 is, thereby, at positive potential.
  • the base potential of the second transistor 48 is driven in the positive direction to the extent that this transistor 48 becomes conducting.
  • the amplifier stage 15 is arranged so that the output pulses of the second transistor 48 are only amplified and not inverted. As a result, the switching transistor 11 is non-conducting in its inoperative or initial state, and the injection valves remain closed.
  • the collector potential of the transistor 19 is driven into the negative region.
  • the processes in the first passive network 30 and in the first transistor 47 are for the time being disregarded.
  • the negative step voltage at the collector of the transistor 19, is applied to the base of the second transistor 48 through the connecting line 73,
  • the second transistor 38 becomes non-conducting.
  • the collector potential of the second transistor lb becomes driven thereby in positive direction, and the switching transistor 11 becomes thereby conducting so that the injection valves l3 become opened.
  • the monostable multivibrator 16 is switched back to its stable state, these steps or processes are carried out in reverse, and the injection valves become again closed.
  • the second transistor 48 functions simply as an inverting stage. The second transistor 48 must, thereby, become nonconducting when the injection valves are to be opened.
  • the base electrode of the transistors d7 and 47 are affected only through the resistors 51 and 51'.
  • the transistor 47' switches in the reverse direction from the transistor 48 with which it forms a bistable stage as.
  • the transistor 47' is turned off when the second transistor 48 becomes conducting or is turned on.
  • the switch 39 becomes closed, the same situation applies for the transistor 47 which also forms. a bistable stage 45, together with the second transistor 48.
  • the diodes 37 and 37' are in the circuit, they influence or affect the switching of the bistable stage 45 and 46 only when the passive networks 361) and 3% have negative output pulses.
  • the control arrangement has the purpose or object of preventing the opening of the injection valves '70 under two operating conditions of the engine. This task is achieved through the passive networks 3i) and 3b which provide negative output pulses so that the switching of the bistable stages 45 and as is prevented or inhibited. These two operating conditions of the engine are as follows:
  • the base electrode or the base terminal of the third transistor 47' must receive a negative pulse, so that the second transistor d8 is prevented from being turned off.
  • the collector of the transistor 19 is at positive potential.
  • the second capacitor 32 becomes charged through the resistors 29', 33, and 311'.
  • Both terminals of the first capacitor 36' are connected with the positive terminal 72' of the second capacitor 32, through resistors 33' or 35'.
  • the capacitance of the condenser or capacitor 36' is substantially smaller than that of the second capacitor 32.
  • the voltage step U U K becomes transmitted to the second terminal on, from the first capacitor 36'.
  • This terminal as has substantially the potential +U directly before the instant of time Immediately after the time instant this terminal 6% has the potential U (U, U,,) 2 U, U
  • This potential 2 U U must become negative in order to turn off the transistor d7" through the diode 37' and the resistor 54.
  • This potential becomes negative when U,, becomes smaller than in U This situation prevails, consequently, at higher pulse frequency when only a substantially small time interval is available for charging the second capacitor 32'.
  • the second passive network 30 applies to its second terminal (98', negative output pulses when the maximum speed of the engine is exceeded.
  • the maximum engine speed limit can be set through the third resistor 33' which is constructed in the form of a trimming potentiometer, for the purpose of accurate setting.
  • the output pulses of the second passive network 30' have a steep leading edge, and decay exponentially, since the first capacitor as discharges through the fourth resistor 35'.
  • the second transistor 48 Below the maximum engine speed, the second transistor 48 has applied to it pulses of alternating polarity, through the line 73 and the RC network 59,6ll.
  • the second bistable stage as switches thereby to its other stable state. As long as the second transistor 48 can remain turned off, fuel is injected.
  • the short negative pulse of approximately 10 microseconds is applied to the base of the second transistor 48, through the line 73.
  • a positive pulse with longer duration is obtained from the third transistor 47 Since the pulse height of the short negative pulse is larger than that of the positive pulse, the second transistor 48 still remains turned off for 10 microseconds.
  • the injection valves are not capable of opening within 10 microseconds because of their substantially large inertia. The longer positive pulse then causes the second transistor 48 to be conducting after the approximately 10 microseconds, and prevents the opening, thereby, of the injection valve 90.
  • the first bistable stage 45 functions in a similar manner in maintaining the valves closed during operation.
  • the base of the first transistor 47 is joined with the positive voltage supply line, through the resistors 41 and 42.
  • the first transistor is continuously maintained conducting, since the pulses applied through the high-resistance resistor 51 are not sufficient to turn this transistor off.
  • the first transistor 47 can first be turned off when, at the same time, the switch 39 is closed (in the unactuated position of the gas pedal) and the first passive network 30 provides negative output pulses.
  • the terminal of the second capacitor 32 which is connected to the second resistor 31, receives potential determined from the voltage divider consisting of resistors 49,53 and 31.
  • the voltage U, at the capacitor 32 becomes, thereby, smaller.
  • the upper frequency limit of the first passive network 30 becomes, thereby, smaller, as soon as the first passive network 30 provided a negative output signal.
  • the resistor 53 provides the required hysteresis as follows:
  • the fuel injection is prevented or inhibited when the gas pedal is un-depressed or un-actuated, and the engine speed is above an upper speed limit.
  • This speed limit can, for example, be 1,500 revolutions per minute.
  • no further fuel is injected as a result of the hysteresis. Only when the lower speed limit is first reached, is fuel injection again initiated, in order to avoid stalling of the eng
  • the two diodes 50 and 50 decouple the first transistor 47 from the third transistor 47'.
  • the second transistor 48 can be accomplished through the first transistor 47 as well as through the third transistor 47.
  • the second transistor 48 was utilized three times, and the first transistor 47 was utilized twice.
  • the second transistor 48 serves first as an inverter (when no passive network is applicable), and then this transistor serves as part of the first bistable stage 45.
  • this transistor 48 serves as part of the second bistable stage 46.
  • the transistor 47 serves in the first place as part of the first bistable stage 45, and then in the second place the transistor 47 serves to form an AND gate together with the diodes 37 and 40, the resistors 41 and 42, and the switch 39.
  • FIG. 2 illustrates the switching circuit for a second embodiment of the control arrangement.
  • the four injection valves are subdivided into two groups of two injection valves each. Each one of these groups has its own control channel.
  • the power transistor 11 forms together with the transistor 219, the first control channel.
  • This transistor 219 in front of the power transistor 11 serves in the form of an AND gate.
  • the power transistor 11 forms the second control channel together with the transistor 220 which also serves as an AND gate.
  • Each of the two control channels can be selected through one common bistable multivibrator 200, in an alternating manner for a subsequent injection process with two of the four injection valves.
  • the multivibrator 200 is bordered with a dashed line in the drawing.
  • This multivibrator has two transistors 201 and 202 of npn type. The emitters of these two transistors are directly connected to the negative supply line 65, whereas their collectors lead to the positive voltage supply line 66 through resistors 203 and 204, respectively. From the collector or from the resistor 204 of the transistor 202, stems a feedback network consisting of the series circuit of resistors 205, resistor 206 and a diode base of the transistor 201. The base of the transistor 201 leads to the negative voltage supply line 65 through a resistor 208.
  • the collector of the transistor 201 is connected, in an analogous manner, to the base of the transistor 202, through the two resistors 211 and 212, as well as the diode 213.
  • the base of the transistor 202 leads to the negative voltage supply line 65 through the resistor 214.
  • the selection of the control channel is performed through the two switches 209 and 215 which are present in the distributor, not shown, of the high voltage ignition arrangement of the internal combustion engine. The fixed contacts of these switches are connected to the negative voltage supply line 65.
  • the switching arm of the switch 209 is joined to the junction of the two feedback resistors 205 and 206.
  • the switching arm or movable contact of the switch 215, on the other hand, is connected to the junction of the resistors 211 and 212, which are connected in series and lead to the base of the transistor 202.
  • the bistable multivibrator 200 does not have only the task of selecting one of the control channels.
  • This multivibrator 200 also delivers control pulses for the monostable multivibrator 16. These pulses are provided by the switch 17 in the first embodiment.
  • Two differentiating networks are provided for this purpose. These differentiating networks are composed of the series circuits of a capacitor 229 or 230 and a resistor 231 or 232, respectively.
  • the free terminal of the capacitor 229 is connected to the collector of the transistor 202, and the free terminal of the capacitor 230 is connected to the collector of the transistor 201.
  • the free terminals of the two resistors 231 or 232 are connected to the negative voltage supply line 65.
  • a respective diode 233 and 234 lead to the base of the transistor 18 which forms a part of the monostable multivibrator 16.
  • the monostable multivibrator 16 is thereby actuated when either the switch 209 or the switch 215 are closed. For this reason the monostable multivibrator 16 can determine the pulse duration of both control channels for the fuel injection arrangement.
  • This feedback circuit leads to the The output pulses provided by the collector of the transistor 19 are processed further in a circuit which is similar to the one used in the first embodiment.
  • the second transistor 48 functions again as an inverting stage.
  • the transistor 48 controls the switching transistor 226 which has its collector joined to the bases of the two transistors 219 and 220 through resistors 222 and 223, respectively.
  • These two transistors 219 and 220 function as AND gates.
  • the operational mode of the AND gate is explained in the example related to the first control channel: the switching transistor 11 can conduct only when the transistor 219 is turned off. Two conditions must be fulfilled therewith. First of all, the transistor 201 within the bistable multivibrator 200 must conduct, and secondly, the switching transistor 226 must conduct. The transistor 226, however, conducts only when the second transistor 48 is turned off. i
  • the two cams 210 and 216 actuate the switches 209 and 215 in a synchronous manner, and they are adjusted so that one switch is closed when the other is opened.
  • the switch 215 closes, for example, the transistor 202 is turned off and the transistor 201 becomes conducting.
  • the monostable multivibrator 16 becomes actuated over the differentiating networks, and as a result the second transistor 48 becomes also turned off.
  • the switching transistor 11 conducts thereby and actuates both injection valves of the first group.
  • a voltage divider is provided with resistor 133 and the resistor 132, as well as the thermistor 131.
  • the charging voltage of the first capacitor 36 becomes determined through the resistor 35 and the magnitude of the voltage across the second capacitor 32.
  • the resistor 35 is omitted in the second embodiment.
  • the charging voltage of the first capacitor 36 becomes determined through the voltage divider 132, 131.
  • the thermistor 131 is in thermal contact with the engine block, and has a high resistance at low temperatures.
  • the first capacitor 36 becomes charged to a higher voltage at lower temperatures, so that the frequency limit of the first passive network 30 shifts to higher values. It is achieved therewith that the switchon speed becomes set to the required higher idling speed when the engine is cold. This is required in order that the engine can freely operate or turn over even at low temperatures.
  • the first terminal 67' of the second passive network 30 is not connected with the output of the multivibrator 16, but is instead connected with the collector of the transistor 202 in the bistable multivibrator 200.
  • This switching arrangement is advantageous because the phase relationship of the output pulses of the monostable multivibrator 16, i.e., the relationship of pulse duration to period, is dependent upon the manifold intake pressure of the engine. Since the charging voltage of the second capacitor 32' is determined from the levels of the pulse dwell intervals, the frequency limit of the second passive network 30' depends on the intake manifold pressure, in the first embodiment. In the case of the first passive network 30,, this is of no consequence, since the throttle is closed during operation. In contrast to this, the maximum speed varies as a function of the intake manifold pressure up to approximately 15 per cent, in the first embodiment in which the second passive network 30' interconnects the fuel injection.
  • pulses are applied to the second passive network 30', which have a duration to period ratio that is not dependent upon the intake manifold pressure. These pulses appear only when a single control channel is actuated, so that when the maximum engine speed is exceeded, only the valves of a single valve group becomes closed. In spite of this, effective safety against excessive speeds is obtained in smaller engines of lower power, since the power of the engine drops to less than half, when half of the fuel injection valves are closed. If the arrangement in accordance with the present invention is to be installed in engines with large power output, then all injection valves must be made closeable when the maximum engine speed is exceeded.
  • the first embodiment is basically applicable to this purpose.
  • the control arrangement can be modified without the use of large equipment or complex design. It is only necessary to provide a pulse emitter or generator which applies a pulse to the second passive network 30' when each control channel is actuated. The pulse duration to period ratio of the pulses is thereby not dependent on the intake manifold pressure or manifold vacuum. In this case, it is possible to apply the output pulses of the monostable multivibrator 16 to a further monostable multivibrator. This further monostable multivibrator then provide pulses which no longer have a duration to period ratio which is dependent upon the intake manifold pressure. These pulses can then be used for controlling or applying to the second passive network.
  • the basic concept of the present invention is to provide an arrangement that safely secures against excessive speeds during operation of an engine, through the use of two electronic circuits which are used to control the injection valves.
  • the present invention is applicable to different circuitry. It is also possible, in accordance with the present invention, to design the circuits so that they can take into account still further parameters as, for example, the engine temperature. It is possible, for example, to modify the second passive network 30' by inserting a temperature dependent resistor, so that the maximum engine speed is also limited to lower values at lower temperatures. This is of advantage because when the engine is cold, the lubrication presents difficulties and problems.
  • Control circuit for controlling the operation of at least one group of simultaneously opened and closed electromagnetic fuel injection spray valves of a fuel injection system of an internal combustion engine, comprising, in combination, a monostable multivibrator for producing, in dependence on at least one engine operating parameter, control pulses in time with the rotation of the engine crankshaft for determining the length of the open times of the fuel injection spray valves; switching means for controlling the opening and closing of the fuel injection spray valves, said switching means being connected to receive said control pulses as input for controlling said switching means; first circuit means connected to said monostable multivibrator and to said switching means for preventing, only when the throttle valve is closed, said control pulses from controlling said switching means when the engine rpm exceeds an upper limit that is above the idling rpm so as to prevent the injection of fuel by at least one group of valves and for allowing, only when the throttle valve is closed, said control pulses to control said switching means at an engine rpm that is below said upper limit but above the idling rpm so as again
  • Control circuit for controlling the operation of two groups of simultaneously opened and closed electromagnetic fuel injection spray valves of a fuel injection system of an internal combustion engine of which the valves of each group are simultaneously opened and closed, comprising, in combination, a monostable multivibrator for producing, in dependence on at least one engine operating parameter, control pulses in time with the rotation of the engine crankshaft for determining the length of the open times of the fuel injection spray valves; switching means for controlling the opening and closing of the fuel injection spray valves, said switching means being connected to receive said control pulses as input for controlling said switching means; first circuit means connected to said monostable multivibrator and to said switching means for preventing, only when the throttle valve is closed, said control pulses from controlling said switching means when the engine rpm exceeds an upper limit that is above the idling rpm so as to prevent the injection of fuel by at least one group of valves and for allowing, only when the throttle valve is closed, said control pulses to control said switching means at an engine rpm that is below said upper limit but above
  • control arrangement as defined in claim 3, further including a diode connected between said second external connection and said input of said bistable triggered circuit of said first circuit means.
  • said passive network of said first circuit means further includes a first resistor and a first capacitor connected in series between said first and second external connections, a diode, and a second capacitor and a second resistor connected in series between said third external connection and the junction between said first resistor and said first capacitor, a third resistor connected between the junction between said diode and said second capacitor and said junction between said first resistor and said first capacitor, and a fourth resistor connected between the junction between said diode and said second capacitor and said second connection.
  • each said passive network has the same component, the values of which are different in dependence on said upper limit and said maximum engine rpm.
  • said bistable triggered circuit of said first circuit means includes first and second transistors, a resistor connecting the output electrode of the first transistor to the input electrode of the second transistor, and a resistor connecting the output electrode of the second transistor and the input electrode of the first transistor.
  • bistable triggered circuit of said first circuit means further including a resistor connecting said input electrode of said second transistor to the first source polarity, two series connected resistors connecting said input electrode of said second transistor to the second source polarity, a series connected capacitor and resistor connecting said input electrode of said second transistor to the output of said monostable multivibrator, the junction between said two series connected resistorsbeing connected to the output of said monostable multivibrator.
  • said bistable triggered circuit of said second circuit means includes said second transistor of said bistable circuit of said first circuit means and a third transistor, said resistor connecting the output electrode of said first transistor to the input electrode of said second transistor also connecting the output electrode of said third transistor to the input electrode of said second transistor, and a resistor connected between the input electrode of said third transistor and the output electrode of said second transistor.
  • control arrangement as defined in claim 10 including a respective diode connecting the output electrode of each of said first and third transistor to said resistor connecting the output electrode of said first transistor to the input electrode of said second transistor, for mutually decoupling the first and third transistor.
  • the passive network of said second circuit means has first, second and third external connections, said first external connection being connected to the output of said monostable multivibrator, said second external connection being connected to the input electrode of said third transistor, said third external connection being connected to one polarity of a source of voltage, and further wherein said switching means is a switching transistor and the output electrode of said second transistor is connected to the control electrode of said switching transistor.
  • said bistable triggered circuit of said first circuit means includes first and second transistors, a resistor connecting the output electrode of the first transistor to the input electrode of the second transistor, a resistor connecting the output electrode of the second transistor to the input electrode of the first transistor, and further wherein a resistor connects the output electrode of said first transistor of said bistable triggered circuit of said first circuit means to the junction between said second capacitor and said second resistor of said passive network of said first circuit means for obtaining a switching hysteresis.
US00165797A 1970-07-14 1971-07-13 Control circuit for controlling a fuel injecting system Expired - Lifetime US3736910A (en)

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DE19702034764 DE2034764A1 (de) 1970-07-14 1970-07-14 Steuereinrichtung für Einspritzanlage

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US (1) US3736910A (ru)
AT (1) AT311126B (ru)
CH (1) CH526042A (ru)
DE (1) DE2034764A1 (ru)
FR (1) FR2101674A5 (ru)
GB (1) GB1335893A (ru)
SE (1) SE368260B (ru)
SU (1) SU442614A3 (ru)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3896779A (en) * 1972-03-30 1975-07-29 Nippon Denso Co Fuel injection pump for an internal combustion engine
US3916170A (en) * 1973-04-25 1975-10-28 Nippon Denso Co Air-fuel ratio feed back type fuel injection control system
US3967603A (en) * 1973-05-22 1976-07-06 Roger Jean Habert Speed sensitive switching device
USRE29741E (en) * 1973-04-25 1978-08-22 Nippondenso Co., Ltd. Air-fuel ratio feed back type fuel injection control system
US4173953A (en) * 1977-02-02 1979-11-13 Robert Bosch Gmbh Fuel injection pulse suppressor apparatus
US4177788A (en) * 1978-01-11 1979-12-11 Nippondenso Co., Ltd. Diesel engine fuel control apparatus
US4207845A (en) * 1976-02-12 1980-06-17 Franz Semmler Apparatus for controlling fuel supply to an engine
US4210116A (en) * 1974-03-19 1980-07-01 Holec N.V. Electromagnetically actuated pumps
US4285314A (en) * 1978-08-08 1981-08-25 Robert Bosch Gmbh System to decrease operating jolts in a vehicle by controlling fuel and ignition timing of an internal combustion engine therein
US4375207A (en) * 1978-01-05 1983-03-01 Robert Bosch Gmbh Top speed limiter for an internal combustion engine
US4491115A (en) * 1982-05-28 1985-01-01 Honda Giken Kogyo Kabushiki Kaisha Method for controlling fuel supply to an internal combustion engine at deceleration
US4512321A (en) * 1983-06-15 1985-04-23 Honda Giken Kogyo Kabushiki Kaisha Fuel supply control method for multi cylinder internal combustion engines after termination of fuel cut
US4539643A (en) * 1981-10-01 1985-09-03 Nissan Motor Company, Limited Fuel cut-off control system in fuel injection internal combustion engine with automatic power transmission
US4606312A (en) * 1984-07-31 1986-08-19 Kawasaki Jukogyo Kabushiki Kaisha System for detecting abnormalities in gas engines
US4615316A (en) * 1983-01-10 1986-10-07 Nissan Motor Co., Ltd. Control method and apparatus for protecting engine from excessive wear and the like
US4736719A (en) * 1985-07-12 1988-04-12 Weber S.P.A. System for limiting the maximum speed of an internal combustion engine comprising an electronic injection system
CN103807028A (zh) * 2012-11-07 2014-05-21 福特环球技术公司 用于真空产生的方法和系统

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DE2452808C3 (de) * 1974-11-07 1982-01-07 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur Steuerung des Einspritzverhaltens einer Kraftstoffeinspritzanlage für Brennkraftmaschinen bei Schubbetrieb sowie gleichzeitig zur Drehzahlbegrenzung
JPS55109738A (en) * 1979-02-16 1980-08-23 Nissan Motor Co Ltd Control device for stopping fuel supply
JPS5654933A (en) * 1979-10-12 1981-05-15 Nissan Motor Co Ltd Fuel cut device
JPS5654934A (en) * 1979-10-12 1981-05-15 Nissan Motor Co Ltd Fuel cut device
EP0036396B1 (en) * 1980-03-17 1984-11-14 FIAT AUTO S.p.A. Device for controlling the fuel feed for otto-cycle internal combustion engines for motor vehicles
GB2116333B (en) * 1982-03-01 1987-01-14 Honda Motor Co Ltd Fuel supply control system for internal combustion engines
JPS60237134A (ja) * 1984-05-07 1985-11-26 Toyota Motor Corp 内燃機関の空燃比制御装置

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US3463130A (en) * 1966-11-03 1969-08-26 Bosch Gmbh Robert Fuel injection control system
US3522794A (en) * 1968-03-28 1970-08-04 Bosch Gmbh Robert Electronically controlled injection system for an internal combustion engine
US3570460A (en) * 1968-09-21 1971-03-16 Bosch Gmbh Robert Control system for blocking fuel injection in an internal combustion engine
US3601103A (en) * 1969-10-13 1971-08-24 Ladell Ray Swiden Engine-condition-responsive cutoff apparatus

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US3463130A (en) * 1966-11-03 1969-08-26 Bosch Gmbh Robert Fuel injection control system
US3522794A (en) * 1968-03-28 1970-08-04 Bosch Gmbh Robert Electronically controlled injection system for an internal combustion engine
US3570460A (en) * 1968-09-21 1971-03-16 Bosch Gmbh Robert Control system for blocking fuel injection in an internal combustion engine
US3601103A (en) * 1969-10-13 1971-08-24 Ladell Ray Swiden Engine-condition-responsive cutoff apparatus

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3896779A (en) * 1972-03-30 1975-07-29 Nippon Denso Co Fuel injection pump for an internal combustion engine
US3916170A (en) * 1973-04-25 1975-10-28 Nippon Denso Co Air-fuel ratio feed back type fuel injection control system
USRE29741E (en) * 1973-04-25 1978-08-22 Nippondenso Co., Ltd. Air-fuel ratio feed back type fuel injection control system
US3967603A (en) * 1973-05-22 1976-07-06 Roger Jean Habert Speed sensitive switching device
US4210116A (en) * 1974-03-19 1980-07-01 Holec N.V. Electromagnetically actuated pumps
US4207845A (en) * 1976-02-12 1980-06-17 Franz Semmler Apparatus for controlling fuel supply to an engine
US4173953A (en) * 1977-02-02 1979-11-13 Robert Bosch Gmbh Fuel injection pulse suppressor apparatus
US4375207A (en) * 1978-01-05 1983-03-01 Robert Bosch Gmbh Top speed limiter for an internal combustion engine
US4177788A (en) * 1978-01-11 1979-12-11 Nippondenso Co., Ltd. Diesel engine fuel control apparatus
US4285314A (en) * 1978-08-08 1981-08-25 Robert Bosch Gmbh System to decrease operating jolts in a vehicle by controlling fuel and ignition timing of an internal combustion engine therein
US4539643A (en) * 1981-10-01 1985-09-03 Nissan Motor Company, Limited Fuel cut-off control system in fuel injection internal combustion engine with automatic power transmission
US4491115A (en) * 1982-05-28 1985-01-01 Honda Giken Kogyo Kabushiki Kaisha Method for controlling fuel supply to an internal combustion engine at deceleration
US4615316A (en) * 1983-01-10 1986-10-07 Nissan Motor Co., Ltd. Control method and apparatus for protecting engine from excessive wear and the like
US4512321A (en) * 1983-06-15 1985-04-23 Honda Giken Kogyo Kabushiki Kaisha Fuel supply control method for multi cylinder internal combustion engines after termination of fuel cut
US4606312A (en) * 1984-07-31 1986-08-19 Kawasaki Jukogyo Kabushiki Kaisha System for detecting abnormalities in gas engines
US4736719A (en) * 1985-07-12 1988-04-12 Weber S.P.A. System for limiting the maximum speed of an internal combustion engine comprising an electronic injection system
CN103807028A (zh) * 2012-11-07 2014-05-21 福特环球技术公司 用于真空产生的方法和系统
CN103807028B (zh) * 2012-11-07 2018-05-08 福特环球技术公司 用于真空产生的方法和系统

Also Published As

Publication number Publication date
AT311126B (de) 1973-10-25
FR2101674A5 (ru) 1972-03-31
DE2034764A1 (de) 1972-01-27
SU442614A3 (ru) 1974-09-05
SE368260B (ru) 1974-06-24
CH526042A (de) 1972-07-31
GB1335893A (en) 1973-10-31

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