US3812378A - Aircraft starter control system - Google Patents

Aircraft starter control system Download PDF

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Publication number
US3812378A
US3812378A US00233196A US23319672A US3812378A US 3812378 A US3812378 A US 3812378A US 00233196 A US00233196 A US 00233196A US 23319672 A US23319672 A US 23319672A US 3812378 A US3812378 A US 3812378A
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Prior art keywords
starter
pulse
duration
circuit
solenoid
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US00233196A
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English (en)
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W Coman
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Bendix Corp
Parker Intangibles LLC
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Bendix Corp
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Priority to US00233196A priority Critical patent/US3812378A/en
Priority to DE2311274A priority patent/DE2311274C3/de
Priority to FR7308072A priority patent/FR2175479A5/fr
Priority to GB1135373A priority patent/GB1375146A/en
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Publication of US3812378A publication Critical patent/US3812378A/en
Assigned to PARKER-HANNIFIN CORPORATION reassignment PARKER-HANNIFIN CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ALLIED CORPORATION A CORP. NY
Assigned to PARKER INTANGIBLES INC., A CORP. OF DE reassignment PARKER INTANGIBLES INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PARKER-HANNIFIN CORPORATION
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0848—Circuits or control means specially adapted for starting of engines with means for detecting successful engine start, e.g. to stop starter actuation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D41/00—Power installations for auxiliary purposes

Definitions

  • ABSTRACT [22] F'led: 1972 A control system for automatically closing a solenoid- [21] App].
  • N 233,196 operated air valve that supplies pressurized air to rotate an air turbine starter motor of an aircraft engine when the starter rotor reaches a predetermined rotag 290/38 290/ 17 21 3 tional speed.
  • the control system senses rotation of the [58] d x 4 starter rotor and produces a pulse train wherein each m 0 earc 123/1 7 of the pulses generated has a duration which is a function of the rotational speed of the starter rotor and compares each pulse duration to a reference pulse [56] References which corresponds to a predetermined rotational UNITED STATES PATENTS speed of the starter rotor.
  • the present invention relates to an aircraft starter control system of the type having a control circuit to de-energize the aircraft starter motor when the starter rotor has reached a predetermined speed.
  • control system for an aircraft starter includes a device for sensing the rotational speed of the starter rotor and a control circuit that removes power to the starter solenoid once the aircraft engine has started, thereby preventing the starter rotor from being rotated at excessive speeds that would adversely affect the starter motor.
  • Present starter control systems sense the rotation of the starter rotor by inducing an electric potential in a winding of a magnetic pickup and passing the signal produced to a filter circuit.
  • the filter circuit blocks all signals below a predetermined frequency.
  • the output of the filter circuit is connected to a transistor switch which is turned OFF when the frequency of the input signal exceeds a predetermined value.
  • the transistor switch is connected in series to an electrical power source and when the transistor switch is OFF, power to the starter is'removed.
  • the disadvantage of this type of circuit is the filter network associated therewith, which is both bulky and expensive. Further, the response time of the control circuit is limited by the fact that it is responsive to a frequency, which is a plurality of pulses, rather than a pulse.
  • An example of the aforementioned prior art control system can be found in US. Pat. No. 3,440,433 to W. E. Coman, entitled Aircraft Starter Control issued Apr. 22, 1969.
  • This invention provides an aircraft starter control system that is smaller in size, less expensive and has a faster response time than prior art control systems.
  • the invention is an airraft starter control system characterized by a control circuit which is responsive to each revolution of the starter rotor and de-energizes the starter circuit when the starter rotor reaches a predetermined rate.
  • control circuit comprises: a permanent magnet generator for generating a first pulse train wherein each of the pulses generated has a duration which is a function of the rotational speed of the starter rotor; a second pulse generator for generating a second pulse train wherein each of the pulses generated has a constant time duration that corresponds to a predetermined rotational speed of the starter rotor, at which the starter is to be deenergized; a comparator circuit for receiving the pulses from the first and second pulse generator and producing a first output signal when the duration of a pulse from the first pulse generator is shorter in duration than a pulse from the second pulse generator; and a transistorized switching circuit in combination with the power supplied to the starter, the transistorized circuit including a transistor switch which upon receipt of said first signal from said comparator becomes nonconductive to de-energize the circuit which supplies power to the starter.
  • Yet another object of this invention is to provide an aircraft starter control circuit that has a faster response time and better accuracy than previous aircraft control systems.
  • FIG. I is a block diagram of an aircraft starter control system.
  • FIG. 2 is a block diagram of a control circuit for an aircraft starter control system that utilizes the principles of this invention.
  • FIG. 3 is an alternate block diagram of a control circuit for an aircraft starter control system that utilizes the principles of this invention.
  • FIG. 4 is a schematic diagram of a control circuit shown in FIG. 3.
  • FIG. 1 illustrates an aircraft starter control system.
  • the control circuit senses the rotational speed of the starter rotor and transmits a signal to deenergize the power to the starter motor and/or starter solenoid when the rotational speed of the starter rotor has reached a predetermined speed.
  • a signal may be either the presence of a current (voltage) or the absence of a current (voltage), depending on how one wishes to operate the circuit.
  • FIG. 2 illustrates how the control circuit reacts to pulses generated byrotation of the starter rotor.
  • a permanent magnet generator 1 supplies impulses to a bistable 2 and an AND gate 9.
  • the bistable device 2 initiates a pulse upon receipt of a first impulse from the permanent magnet generator 1 and terminates the pulse upon a second impulse from the permanent magnet generator I.
  • the output of the bistable or flipflop device 2 is applied to a comparator 5 and to a pulse generator 3.
  • the pulse generator 3 produces a pulse of fixed duration upon receipt of a pulse from the bistable 2.
  • the duration of the pulse from the pulse generator 3 may be adjusted to correspond to any one of a plurality of speeds at which de-energization of the starter is desired.
  • the comparator 5 receives pulses from the pulse generator 3 and from the bistable 2. The comparator then compares the two signals and provides an output signal to the AND gate 9 when the duration of a pulse from the bistable device 2 is greater than the duration of a pulse from the pulse generator 3.
  • the AND gate 9, upon receipt of a signal D, from the permanent magnet generator 1 and the absence of an output current from the comparator (D, greater than D supplies a signal to power switch 6 to permit power to be supplied to the starter 8 from a power supply 7. As the speed of the starter rotor increases, the pulse duration from the bistable 2 will decrease.
  • the comparator 5 When there is a signal D, from the permanent magnet generator 1 and the duration of a pulse from the pulse D generator 3 is greater than the duration of a pulse D, from the bistable 2, the comparator 5 will not supply a signal to the AND gate 9 and no power will be supplied to the starter.
  • D corresponds to the duration of a pulse from the bistable device 2 and pulse generator 3 respectively.
  • D corresponds to a signal (voltage) supplied from the permanent magnet generator circuit 1.
  • FIG. 3 is also a block'diagram of a control system that incorporates the principles of this invention.
  • the symbols used on the lines connecting the blocks correspond to the following information: D, is the duration of a pulse from the bistable 2; D is the duration of a pulse from the pulse generator 3; D is the signal from the permanent magnet generator circuit which is preferably a voltage signal rather than a pulse signal.
  • D is the duration of a pulse from the bistable 2;
  • D is the duration of a pulse from the pulse generator 3;
  • D is the signal from the permanent magnet generator circuit which is preferably a voltage signal rather than a pulse signal.
  • the numbers associated with the lines connecting blocks can be used together with the circuit shown in FIG. 4 to identify the signal connecting leads between each circuit.
  • the permanent magnet generator 1 supplies pulses to the bistable device 2 which in turn supplies pulses to the comparator 4 and pulses to trigger pulse generator 3.
  • Comparator 4 compares the duration of the pulses from the pulse generator 3 to the duration of a pulse from the bistable 2 and produces an output signal when the duration of a pulse D, from the bistable has a duration greater than a pulse D from the pulse "generator 3.
  • Comparator 5 upon receiving a signal from the comparator 4 and a signal from the permanent magnet generator 1, supplies an output signal to transistor switch 6, allowing transistor switch 6 to remain ON, thereby supplying power to the starter and starter solenoid.
  • FIG. 4 is a schematic diagram of the block diagram shown'in FIG. 3. For clarity, portions of the circuitry have been outlined by dotted lines and identified as corresponding to the circuitry associated with the particular block shown in FIG. 3.
  • the permanent magnet generator circuit 1 includes a permanent magnet 101 which may be attached to the rotor shaft of the starter (not shown) to induce a voltage pulse in winding 102. Pulses from winding 102 are applied to a full wave rectifier bridge having diodes 11.'
  • the output of the bridge is attached to a circuit that includes capacitors 12 and 14, zener diode l3 and resistor 15 for smoothing out and regulating the rectified current from the bridge 10.
  • the rectified current produced by the bridge 10 is supplied to zener diode 52 of comparator 5 through lead 101.
  • the output of the bridge 10 that is smoothed by capacitors 12 and 14 is also supplied to a bistable device through resistors 19, 21 and lead 100.
  • Transistor 17, in circuit relationship with capacitor 18 and resistor 16 is connected to one input of the bridge 10 and the negative output of the bridge 10.
  • the transistor 17 shorts out the signal that flows through resistor 19 on'every half-cycle so that only one pulse is supplied to the bistable 2 for every revolution of the starter rotor. Therefore, in this arrangement the bistable will produce one pulse for every two revolutions of the starter rotor.
  • the bistable device 2 shown within the dotted lines is a solid state integrated circuit 22 that is capable of operating over a temperature range of -65F to 250F.
  • the bistable 22 receives its input power from lead 23 and its input signals through lead from the permanent magnet generator circuit 1.
  • the bistable 2 is a flipflop circuit that initiates a pulse upon receiving a first impulse from the permanent magnet generator circuit 1 and terminates such pulse on a second impulse from the permanent magnet generator 1.
  • the bistable or flipflop device 22 supplies a trigger pulse to pulse generating circuit 3 through lead 200 and a complementary pulse to comparator 4 through lead 201.
  • the pulse generator circuit 3 includes resistors 31 and 32 and capacitor 33 which determine the duration of the pulses generated by the multivibrator circuit 30 which is an integrated circuit capable of operating over a temperature range of 65F to 250F.
  • the resistors 31, 32 or capacitor 33 may be manually adjustable so that the duration of the pulses generated by the multivibrator circuit 30 can be adjusted to correspond to any fixed duration which further corresponds to a particular rotor speed.
  • the multivibrator circuit 30 receives a pulse through lead 200 from the flipflop device 22, it produces an output pulse having a fixed duration determined by resistors 31 and 32 and capacitor 33. These pulses of the multivibrators circuit having constant duration are supplied through lead 300 to comparator circuit 4.
  • the comparator 4 includes an integrated circuit 40 that is capable of operating over a temperature range of 65F to 250F.
  • the integrated circuit 40 produces an output signal through lead 400 and diode 42 to comparator circuit 5 upon receipt of a pulse from the flipflop device 22 that is greater in duration than a pulse supplied to the comparator 40 from the multivibrator 30.
  • the comparator 40 does not provide an output signal through lead 400 and diode 42.
  • the second comparator 5 or AND gate includes a transistor switch 54 that is conductive upon receipt of a signal from the first comparator 4 through lead 400 and diode 42; a zener diode 52 which does not allow current to flow through the collector-emitter terminals of transistor 54 until there is a sufficient drive current available at the output of the bridge in the permanent magnet generator circuit; and a silicon-controlled rectifier 57 which has a signal supplied to the gate 59 thereof when transistor 54 is OFF, thereby allowing a current to flow through lead 501, diode 68, siliconcontrolled rectifier 57 and lead 500 which is the return to the negative side of the rectifier bridge 10. With current flowing through diode 68 a positive potential is de veloped between points B and A, with B being the positive terminal.
  • zener diode 52 The function of zener diode 52 is to inhibit the action of silicon-controlled rectifier 57 by preventing current flow to gate 59 when the rotational speed of rotor 101 is very low. Under this condition the voltage available at lead 23 is insufficient to properly operate the logic elements and can cause a false shutdown signal from first comparator 4.
  • the second comparator 5 operates as a signal inverter. In other words, when'a signal is supplied to the second comparator 5 from the first comparator 4, no potential is developed across diode 68. However, when the input signal from the first comparator 4 through lead 400 and diode 42 is removed, the second comparator 5 produces an output signal in the form of a voltage developed across diode 68.
  • the transistor switch 6 is a transistorized switching network that includes a main switching transistor 66; signal amplifying transistors 62 and 64; zener diode 67; and a full wave rectifier bridge 60 that includes rectifiers 61 and 72.
  • the input leads 68 and 69 to the bridge 60 also function as the output leads of the transistor switch 6.
  • the transistor switch does not require a rectifier bridge 60.
  • the bridge 60 makes the transistor switch 66 polarity insensitive. In other words, regardless of the polarity of the signal applied to leads 68 and 69, transistor 66 will function.
  • transistor 66 When transistor 66 is ON there is a current path from lead 68, diode 61, transistor 66, diode 72 and lead 69, and coil 81 is energized by battery 82. When transistor 66 is OFF, current cannot flow between leads 68 and 69 and coil 81 is de-energized.
  • the transistors 62, 64 and 66 are arranged in combination with a bridge rectifier 60 so that when the current flows through the bridge from battery 82, transistor 66 is forward biased ON and transistors 62 and 64 are also conducting ON. Transistors 62, 64 and 66 remain ON when transistor 54 is ON which allows current to bypass diode 68 through lead 500 where it returns to the negative terminal of bridge rectifier 10. However, when transistor 54 is OFF, silicon-controlled rectifier 57 is gated ON generating a voltage across diode 68 that reverse biases transistor 62 which in turn turns OFF transistors 64 and 66.
  • the starter circuit 8 includes a source of d-c power, such as a battery 82, in series with a starter motor and- /or solenoid winding 81 which is in series with transistor 66 of the transistor switch 6. Therefore, when transistor 66 is conducting (ON), power is supplied to the coil 81 and when transistor switch 66 is nonconducting (OFF), power is removed from winding 81.
  • a source of d-c power such as a battery 82
  • FIG. 4 shows a winding 81 which corresponds to the solenoid valve.
  • electrical energy applied to the solenoid valve 81, operates to open the valve and supply pressurized air to rotate a turbine starter motor to start the engine (not shown).
  • Current flowing through the coil 81 also flows through lead 68, diode 61, transistor 66, diode 72 and lead 69 to ground.
  • the starter rotor begins to rotate, the permanent magnet 101 rotating past the coil 102 induces electrical impulses in the coil 102 that are rectified by bridge rectifier 10.
  • the duration of the pulses D, generated by the flipflop 22 is longer than the duration of the pulses D generated by the monostable multivibrator circuit 30 and therefore comparator 40 produces an output signal to keep transistor 54 ON.
  • transistor 54 ON current from the output of the bridge 10 flows through lead 101, zener diode 52, the emittercollector electrodes of transistor 54, and back through lead 500 to the negative end of the bridge rectifier 10.
  • comparator 40 When the duration of a pulse D becomes shorter than the duration D of a pulse from the multivibrator circuit 30, comparator 40 ceases to produce an output signal to transistor 54. When the comparator '40 ceases to provide an output signal to the transistor 54, transistor 54 turns OFF. This action allows current D to flow through lead 502, diode 55 and the gate electrode 59 of the silicon-controlled rectifier 57, turning the siliconcontrolled rectifier ON. Once the siliconcontrolled rectifier 57 is ON, a current flows from a bridge rectifier 10 through lead 101 out through lead 501, up through diode 68, through silicon-controlled rectifier 57, and then through the lead 500 to the negative end of the bridge 10.
  • the current flowing through diode 68 acts to reverse bias transistor 62, turning transistor 62, 64 and 66 OFF. With transistor 66 OFF, current can no longer flow through winding 81 of the solenoid. With the winding of the solenoid de-energized, the source of pressurized air is isolated from the starter Coil 81 De-energized Coil 81 Energized Starter OFF Starter ON I. Pulse duration D, greater than pulse duration D, Pulse duration D greater than pulse duration D, and current signal D 2. Output signal from comparator 4 No output signal from comparator Transistor 54 OFF Zener diode 52 ON SCR 57 ON Diode 68 forward biased ON Transistors 62, 64, 66 OFF 3. Transistor 54 ON 4.
  • a signal from a comparator may be considered as being either the presence or the absence of a voltage (current) which has an efiect on another stage of the circuit. Accordingly, it is intended that the illustrative and descriptive materials herein be used to illustrate the principles and not to limit the scope thereof.
  • a starter control system for automatically deenergizing a circuit, which supplies power to said starter, when the starter rotor reaches a predetermined rotational speed, said control system comprising:
  • said means for generating a first pulse train comprising: a permanent magnet generator; and a bistable circuit that initiates a pulse upon receiving a first impulse from said permanent magnet generator and terminates said pulse upon a second impulse from said permanent magnet generator; means for generating a second pulse train wherein each of said pulses generated has a constant time duration D; that corresponds to said predetermined rotational speed of said starter rotor at which said motor is to be de-energized; and switching means for de-energizing the circuit that supplies power to said starter when the duration D, of a pulse of said first pulse train is shorter than the duration D of a pulse of said second pulse train whereby the starter is automatically de-energized when said starter rotor reaches said predetermined rotational speed, said switching means comprising:
  • a first comparator circuit for receiving the pulses from said first pulse generator and said second pulse generator, said first comparator producing a first signal when the duration of a pulse from said first pulse generator is shorter in duration than a pulse from said second pulse generator;
  • a transistorized switching circuit operable to remove electrical energy to said starter upon receipt of said first signal from said first comparator, circuit thereby de-energizing said starter.
  • a second comparator having means for receiving a signal from said first comparator and means for receiving a signal from said permanent magnet generator, said second comparator operative to produce an output signal when it receives said first signal from said first comparator and a signal from said generator; and wherein said transistorized switching circuit conducts to apply electrical energy to said starter upon receipt of said output signal from said second comparator and is nonconductive to de-energize the circuit which supplies electrical energy to said starter in the absence of a first signal from said second comparator.
  • a silicon-controlled rectifier having its gate in electrical circuit relationship with said zener diode and one of its other electrodes in circuit relationship with the remaining electrode of said first transistor, said SCR being conductive when said first transistor is nonconductive and said zener diode is conductive, whereby said second comparator produces an output signal to turn off the transistorized switch and deenergize the starter.
  • switching means for automatically de-energizing said solenoid when said starter rotor has reached a predetermined rotational speed said means for deenergizing said solenoid further including: means for generating a first pulse train wherein each of said pulses generated has a duration D, which is a function of the rotational speed of said starter rotor;
  • each of said pulses generated has a constant time duration D that corresponds to said predetermined speed of said starter rotor;
  • said means for de-energizing said solenoid includes a transistor switch, in series electrical relationship with said solenoid, that is conducting ON when D is greater than D and is nonconducting OFF when D is less than D 7.
  • said means for generating said first pulse train includes a permanent magnet generator and a bistable multivibrator.
  • said means for generating said first pulse train includes a permanent magnet generator and a bistable multivibrator.
  • control system as recited in claim 6 including a full wave rectifier bridge having its output terminals connected to the collector and emitter electrodes of said transistor switch and its input terminals connected in series with said source of electrical power so that said transistor switch is operable regardless of the direction that current flows through said solenoid.
  • each of said pulses generated has a duration D, which is a function of the rotational speed of said starter rotor; means for generating a second pulse train wherein each of said pulses generated has a constant time duration D that corresponds to said predetermined rotational speed of said starter rotor;
  • control system including a d-c power supply for supplying power to said solenoid and wherein said means for closing the solenoid operated air valve includes a transistor switch and a full wave rectifier bridge in circuit relationship with said power supply to control the power applied to said solenoid, said transistor switch having its emitter and collector terminals connected to the output of said bridge, said rectifier bridge having two input leads connectable in series to said dc power supply whereby said transistor switch is operable to permit current to flow into said solenoid from said d-c supply when either lead of said bridge is connected to the positive side of said d-c power supply and the remaining lead of said bridge is connected to said negative side of said d-c power supply.
  • a control system as recited in claim 10 wherein the means for generating a first pulse train is a permanent magnet generator.
  • said means for generating a first pulse train includes a bistable circuit that initiates a pulse upon receiving a first impulse from said permanent magnet generator and terminates said pulse upon a second impulse from said generator.
  • said means for generating a first pulse train includes a bistable circuit that initiates a pulse upon receiving a first impulse from said permanent magnet generator and terminates said pulse upon receiving a second impulse from said permanent magnet generator.
  • said means for closing the solenoid operated air valve includes a comparator that compares the duration of a pulse from said bistable to the duration of a pulse from said second pulse train generator and provides an output signal when the duration of the pulse from said bistable is shorter than the duration of said pulse from said second pulse train generator.
  • said means for closing the solenoid operated air valve includes a comparator that compares the duration of a pulse from said bistable to the duration of a pulse from said second pulse train generator and provides an output signal when the duration of the pulse from said bistable is shorter than the duration of said pulse from said second pulse train generator.
  • said means for closing the solenoid operated air valve includes a transistorized switch in series electrical relationship with said solenoid and the power supplied to the solenoid so that when said transistorized switch is open, said solenoid is de-energized whereby said valve is closed thereby removing the supply of pressurized air that rotates said starter motor.
  • said means for closing the solenoid operated air valve includes a transistorized switch in series electrical relationship with said solenoid and the power supplied to the solenoid so that when said transistorized switch is open, said solenoid is de-energized whereby said valve is closed thereby removing the supply of pressurized air that rotates said starter motor.
  • said means for closing the solenoid operated air valve includes a transistorized switch in series electrical relationship with said solenoid and the power supplied to the solenoid so that when said transistorized switch is open, said solenoid is de-energized whereby said valve is closed thereby removing the supply of pressurized air that rotates said starter motor.
  • said means for closing the solenoid operated air valve includes a transistorized switch in series electrical relationship with said solenoid and the power supplied to the solenoid so that when said transistorized switch is open, said solenoid is de-energized whereby said valve is closed thereby removing the supply of pressurized air that rotates said starter motor.
  • said means for closing the solenoid operated air valve includes a transistorized switch in series electrical relationship with said solenoid and the power supplied to the solenoid so that when said transistorized switch is open, said solenoid is de-energized whereby said valve is closed thereby removing the supply of pressurized air that rotates said starter motor.
  • a control system for de-energizing a circuit comprising:
  • a first circuit which includes:
  • a transistor switch in series circuit relationship with said reactive circuit element, said transistor switch operable upon closing of said first switch to permit electrical energy to be supplied to said reactive circuit element, said transistor switch including a passive circuit element in circuit relationship with said transistor and having a voltage applied thereto from said first source upon closing of said first switch which forward biases said transistor so that said transistor is conductive a second circuit which includes:
  • an electromagnetic source of electrical energy separate from said first source of electrical energy for producing pulses which vary in duration as a function of a determinable parameter of said electromagnetic device, and including a pennanent magnet generator having a rotor and stator element, said generator generating electrical energy levels which are proportional to the rotational speed of the generator;
  • the reactive circuit element being the winding of an electromechanical device that controls power to a starter motor and said permanent magnet generator being mechanically linked to said starter motor;
  • a starter control system for automatically deenergizing a circuit, which supplies power to said starter, when the starter rotor reaches a predetermined rotational speed, said control system comprising:
  • each of said pulses generates has a duration D which is a function of the rotational speed of said starter rotor, said pulses decreasing in duration as the rotational speed of said rotor increases, said means for generating a first pulse train including: a permanent magnet generator;
  • each of said pulses generated has a constant time duration D that corresponds to said predetermined rotational speed of said starter rotor at which said motor is to be de-energized;
  • a transistorized switching circuit that includes at least one transistor, said transistor allowing electrical energy to be supplied to said starter in the conducting state and preventing electrical energy from being supplied to said starter in the nonconducting state; and g a comparator means for receiving pulses from said first pulse generator, pulses from said second pulse generator, and a voltage signal from said permanent magnet generator, said comparator means operable to produce an output signal upon receipt of a voltage signal of predetermined magnitude from said generator and a pulse from said first pulse generating means having a duration greater than a pulse from said second pulse generating means, said output signal coupled to said transistor switch to render said transistor conductive, whereby electrical energy is supplied to said starter when said transistor conducts and when said signal from said comparator means is removed, said transistor switch is nonconductive and said starter is deenergized.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Motor And Converter Starters (AREA)
  • Control Of Eletrric Generators (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
US00233196A 1972-03-09 1972-03-09 Aircraft starter control system Expired - Lifetime US3812378A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00233196A US3812378A (en) 1972-03-09 1972-03-09 Aircraft starter control system
DE2311274A DE2311274C3 (de) 1972-03-09 1973-03-07 Steuereinrichtung für den Startermotor einer Brennkraftmaschine, insbesondere eines Flugzeugs
FR7308072A FR2175479A5 (de) 1972-03-09 1973-03-07
GB1135373A GB1375146A (de) 1972-03-09 1973-03-08

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US00233196A US3812378A (en) 1972-03-09 1972-03-09 Aircraft starter control system

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US3812378A true US3812378A (en) 1974-05-21

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DE (1) DE2311274C3 (de)
FR (1) FR2175479A5 (de)
GB (1) GB1375146A (de)

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US4490620A (en) * 1983-09-12 1984-12-25 Eaton Corporation Engine starter protective and control module and system
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US5237815A (en) * 1991-02-19 1993-08-24 Sundstrand Corporation Control of a hydraulic start system
US6836086B1 (en) 2002-03-08 2004-12-28 Hamilton Sundstrand Corporation Controlled starting system for a gas turbine engine
US20070132245A1 (en) * 2005-09-15 2007-06-14 Hamilton Sundstrand Corporation Electrical starter generator system for a gas turbine engine
US20120266606A1 (en) * 2011-04-20 2012-10-25 Honeywell International Inc. Air turbine start system with monopole starter air valve position
EP3273007A1 (de) * 2016-07-21 2018-01-24 United Technologies Corporation Luftzufuhrsteuerung während der überwachung eines gasturbinenmotors
US10221774B2 (en) 2016-07-21 2019-03-05 United Technologies Corporation Speed control during motoring of a gas turbine engine
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US10633106B2 (en) 2016-07-21 2020-04-28 United Technologies Corporation Alternating starter use during multi-engine motoring
US10787968B2 (en) 2016-09-30 2020-09-29 Raytheon Technologies Corporation Gas turbine engine motoring with starter air valve manual override
US10823079B2 (en) 2016-11-29 2020-11-03 Raytheon Technologies Corporation Metered orifice for motoring of a gas turbine engine
US11047257B2 (en) 2016-07-21 2021-06-29 Raytheon Technologies Corporation Multi-engine coordination during gas turbine engine motoring

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DE3416039A1 (de) * 1983-06-01 1984-12-06 VEB Elektromotorenwerk Dresden Betrieb des VEB Kombinat Elektromaschinenbau, DDR 8023 Dresden Schaltungsanordnung zum anlassen von brennkraftmaschinen mittels elektrischem anlassmotor

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Also Published As

Publication number Publication date
FR2175479A5 (de) 1973-10-19
GB1375146A (de) 1974-11-27
DE2311274C3 (de) 1980-03-27
DE2311274A1 (de) 1973-09-13
DE2311274B2 (de) 1979-07-19

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