US3563221A - Ignition device for internal combustion engine - Google Patents

Ignition device for internal combustion engine Download PDF

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Publication number
US3563221A
US3563221A US799260A US3563221DA US3563221A US 3563221 A US3563221 A US 3563221A US 799260 A US799260 A US 799260A US 3563221D A US3563221D A US 3563221DA US 3563221 A US3563221 A US 3563221A
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United States
Prior art keywords
winding
ignition
terminal
output
primary
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Expired - Lifetime
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US799260A
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English (en)
Inventor
Yasuo Tada
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/06—Other installations having capacitive energy storage
    • F02P3/08—Layout of circuits
    • F02P3/0807—Closing the discharge circuit of the storage capacitor with electronic switching means
    • F02P3/0838—Closing the discharge circuit of the storage capacitor with electronic switching means with semiconductor devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/12—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having means for strengthening spark during starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/06—Other installations having capacitive energy storage
    • F02P3/08—Layout of circuits
    • F02P3/0876—Layout of circuits the storage capacitor being charged by means of an energy converter (DC-DC converter) or of an intermediate storage inductance
    • F02P3/0884—Closing the discharge circuit of the storage capacitor with semiconductor devices

Definitions

  • the capacitor discharge type of ignition devices for use with internal combustion engines comprises generally a source of direct current, an inverter forcohverting a power of direct current provided by the source to a power of alternating current and increasing the voltage of the converted power, a rectifier for rectifying the power of alternating current from the inverter to provide a power of direct current, a capacitor charged with the power of direct current fromthe rectifier and a switch connected in a discharge circuit for the capacitor and operative in itsclosed position to discharge the charge on the capacitor into the associatedignition 'coil to produce an ignition voltage across the latter.
  • a source of electrical power for the ignitiondevice referred to, that is, the source of direct current as above described is additionally used as a source of electricalpower for an electric device for starting an internal combustion engine which ignited by the ignition device.
  • the source of direct current electric arc across the contacts is scarcely called in question while insuring a long useful life of the resulting ignition device.
  • an, inverter includes a trans former provided on its input or primary winding with an intermediate terminal separated from its end .tenninals to present a higher turn ratio associated with the intermediate terminal to the output winding of the transformer. Then the primary winding have selectively supplied thereto an electrical energy is composed of a storage batteryhaving a rating voltage of either 12 or 24 volts and the starting electric device is a starting electric motor through which a .high load current is required to flow in operation.
  • ignition devices for an internal combustion engine rneeting such requirements is described'and claimed in U.S. Pat. No. 3,352,295 issued Nov. 14,1967 to Takas Miki and as signed to the same assignee as the present application.
  • the cited patent discloses in FIGS. 1 and 2 ignition devices for internal combustionengines including a capacitor.
  • the capacitor has its discharge circuit adapted to be open. and closed directly by a set of mechanical contacts.
  • the circuit for gating the thyristor is required to have an electrical energy supplied by the as sociated source of direct current during and after the operation of starting the engine while such: supply of the electrical energy to the gating circuit must be terminated during the suspension of operation of the engine for the purpose of preventing the source from wastefullyconsuming the electrical energy.
  • one conductor can be connected to the source of direct current through a switch adapted to be closed upon starting the engine thereby to supply an electrical energy to.
  • SUMMARY-0F THE-INVENTION Accordingly it is an object of the invention to provide a new and improved ignition device for use with an internal combustion engine having a long useful life and including means for compensating-for a decrease in voltage applied to the device upon starting the engine and free from any short-circuiting fault while ensuring that'the engine is ignited during the operation thereof without any waste of electrical energy during the suspension of operation of the engine.
  • the invention resides in an ignition device of capacitor discharge type for use with an internal combustion engine including an ignition capacitor charged with a rectified output from an inverter, and a thyristor connected in a circuit for discharging the capacitor and a pair of conductors for supplying electrical energies of direct current i to an intermediate terminal and an end terminal of an input transformer winding in the inverter respectively, and a pair of the thyristor, the diodes being so poled that a voltage of either dispose a thyristor in the discharge circuit for the capacitor.
  • an arrangement disclosed herein comprises a source of direct current 10 such as a 12 v. storage battery equipped on a motor vehicle and an inverter generally designated by the reference numeral 12.
  • the inverter 12 comprises transformer generally designated by the reference numeral 14 including a pair of primary or input windings l6 and 18 connected in series circuit relationship, a single secondary or output winding 20 and a pair of tertiary windings 22 and 24 with all the windings inductively disposed on a saturable magnetic core 26.
  • the primary winding 16 includes a pair of end terminals a and b and an intermediate terminal d while the primary winding 18 includes one end terminal and the other end terminal b common to the primary winding 16.
  • the conventional dot is used to indicate the polarity of each of the primary and tertiary windings.
  • a transistor 28 shown as being of the NPN type includes a collector electrode connected directly to the end terminal a of the primary winding 16, a base electrode connected directly to one terminal of the tertiary winding 22 and an emitter electrode connected directly to the ground such a vehicles chassis (not shown).
  • Another transistor 30 shown as being also of NPN type includes similarly a collector electrode connected directly to the end terminal c of the primary winding 18, a base electrode connected directly to one terminal of the tertiary winding 24 and an emitter electrode connected directly to the ground.
  • the emitter electrodes of both the transistors 28 and 30 are connected to the other terminals of the tertiary windings 22 and 24 through resistors 32 and 34 respectively.
  • Another resistor 36 is connected across the collector and base electrodes of the transistor 28 for the purpose of first flowing a forward base current through the transistor 28 upon starting the inverter 12.
  • a pair of conductors 38 and 40 are connected at one end to the end and intermediate terminals b and d of the primary winding 16 and at the other ends to a pair of stationary contacts A and B of a transfer switch 42 including a movable arm M connected to one terminal, in this case, the positive terminal of the source having the negative terminal connected to the ground.
  • the inverter 12 is operative to convert a direct current voltage supplied by the source 10 to an alternating current voltage and increase the latter voltage.
  • the inverter 12 is shown as including the primary windings, the tertiary windings and the transistors in pairs to form a push-pull configuration it is to be understood that the inverter may be not necessarily of the push-pull type, if desired. In the latter case, the primary winding 18, the tertiary winding 24 and the transistor 30 are omitted.
  • the secondary or output winding 20 of the transformer 12 has connected thereacross a single phase full wave rectifier 44 having a pair of alternating current input tenninals connected to both ends of the winding 20.
  • the full wave rectifier 44 has one direct current output terminal connected to the ground and the other direct current output terminal connected to the ground through an ignition capacitor 46.
  • An ignition coil of auto transformer type generally designated by the reference numeral 48 includes a primary winding 50 and a secondary winding 52 with the junction of both the windings connected to the junction of the rectifier 44 and the capacitor 46.
  • the secondary winding 52 has the other end connected to an ignition plug (not shown) and the primary winding 50 has the other end connected to a thyristor 54.
  • the thyristor 54 includes an anode electrode connected to the other end of the primary ignition winding 50, a cathode electrode connected to the ground and a gate electrode 54.
  • the thyristor 54 along with the primary ignition winding 50 serially connected thereto forms a discharge circuit for the capacitor 46.
  • a gating circuit enclosed with a dashed block 56 is operatively associated with the thyristor.
  • the gating circuit 56 includes a resistor 58 connecting the gate electrode of the thyristor 54 to ground, a gating capacitor 60 connected to the junction of that cathode electrode 'and the resistor 58, a resistor 62 connected to the capacitor 60 and a contact breaker 64 connected between the junction of the capacitor and resistor 60 and 62 respectively and the ground.
  • the contact breaker 64 is arranged to be open and closed by a cam rotating in synchronization with the rotation of the associated engine in the well-known manner. The cam, and engine are well known in the art and therefore they are not illustrated.
  • the breaker 64 is put in its open position at each ignition time of the engine.
  • the resistor 62 is connected to an input terminal 56A to the gating circuit 56 which is, in turn, connected to the conductors 38 and 40 through the respective semiconductor diodes 68 and 70 each poled so as to permit a current to flow from the associated conductor 38 or 40 to the gating circuit 56 therethrough.
  • the transfer switch 42 as previously described has its movable arm M adapted to engage the contact B upon starting the engine and to engage the contact A after the completion of the starting operation and when the engine is put in operation. However it is noted that when the engine is out of operation the movable arm M assumes its neutral position as illustrated in the drawing. This is, none of the contacts A and B are in contact with the movable arm M.
  • a starting electric motor is connected to the source 10 through an on-off switch adapted to be closed when the movable arm M engages the contact B, although the motor and the on-off switch are not illustrated.
  • the inverter 12 is a Royer circuit well known in the art and its operation will be briefly described.
  • the transistor 28 Upon applying a DC voltage from the source 10 to the inverter 12 through either one of the contacts A and B of the switch 42 as the case may be, the transistor 28 is first fired to permit a base current to flow therethrough. Then the transistor 28 is increasingly conducting through the feedback action of the tertiary winding 22 until the magnetic core 26 of the transformer 14 is driven to saturation.
  • the primary winding 18 has a low voltage induced in the reverse direction thereacross whereupon the transistor 30 is now fired, while the transistor 28 becomes nonconducting. Thereafter the process as above described is repeated with the conducting transistor 30.
  • the transistors 28 and 30 are alternately conducting to produce across the secondary or output winding 20 an output of square waveform having a pulse recurrence frequency corresponding to the voltage across the source 10 and increased in magnitude or voltage by the particular turn ratio between the energized portion of the primary winding and the secondary winding.
  • the output from the transformer 14 and therefore the inverter 12 is rectified by the full wave rectifier 44 and charges the ignition capacitor 46.
  • the charge on the capacitor 44 is discharged through the discharge circuit comprising the primary ignition winding 50 and the now conducting thyristor 54 whereupon a high voltage is induced across the secondary ignition winding 52 to ignite the engine in the well-known manner.
  • the thyristor 54 is controlled by the gating circuit 56. More specifically, with the contact breaker 64 closed; a voltage across the gate and cathode electrodes of the thyristor 54 is of zero magnitude maintaining it nonconducting. Then if the contact breaker 64 is open, a charging current flows from the source 10 into the capacitor 60 through the switch 42 and the conductor 38 or 40 as the case may be.
  • This charging current also flows through the resistor 58 to provide a voltage drop thereacross sufficient to gate the thyristor 54 whereupon the charge on the capacitor 44 is discharged as above described, when discharged the capacitor 46 cooperates with the primary ignition winding 50 to generate an oscillatory voltage at the instant this oscillatory voltage is reversely applied to the anode and cathode electrodes of the thyristor 54 the latter is brought into its open state ready for the succeeding ignition operation.
  • the source is connected to the common terminal b of 10 the primary transformer windings l6 and 18 through the movable arm and contact M and A respectively of the switch 42 and the conductor 38 while at the same time, it is connected to the input terminal 56A to the gating circuit 56 through the movable arm M and contact A of the switch 42, the conductor 38 and the diode 68.
  • an output voltage V, from the secondary or output winding of the transformer 14 is expressed by Nab ' former 14 through the conductor 40 and also to the input terminal 56A to the gating circuit 56 through the diode 70.
  • an output voltage from the secondary transformer winding 20 is expressed by N; I I Na-n (2) N. II I ari-" (2') V', output voltage due to primary winding portion between terminals 0 and d;
  • the number of turns n between the terminalsd and b of the primary winding 16 can be selected so as to render both the output voltages V, and V", approximately equal to each other in order to compensate for a difference between output voltages in the normal and starting operations of the engine.
  • An ignition device for use with an internal combustion engine comprising, in combination:
  • inverter means including a transformer comprising a saturable magnetic core, an input winding, an output winding and a feedback winding, all said windings being inductively disposed around said magnetic core and a transistor connected to both said input winding and said feedback winding;
  • said primary winding having an end terminal and an intermediate terminal presenting to said output winding a turn ratio higher than does said end terminal;
  • a second conductor connected to said intermediate terminal of said primary transformer winding and capable of being energized by said source;
  • a transfer switch connected between said source and said first and second conductors such that, the same connects said source to said second conductor upon starting the engine and to said first conductor after the engine has been started and when it is in operation;
  • an ignition coil including a primary winding and a secondary winding inductively coupled to each other, said pri mary winding having one end connected to said ignition capacitor;
  • a thyristor for controlling said ignition capacitor and operative in its closed state to permit said ignition capacitor to be discharged into said primary ignition coil winding to produce an ignition voltage across said secondary coil ignition winding, said thyristor having a control terminal;
  • a gating circuit controlling said thyristor and having an input terminal, means operable in synchronism with the rotation of the engine to produce a gating signal and an output terminal connected with the control terminal of said thyristor;
  • a pair of semiconductor diodes having input and output tenninals, means connecting the output terminals of both of said diodes to the input terminal of said gating circuit, means connecting the input tenninal of one of said diodes with said first conductor, and means connecting the input terminal of the other of said diodes with said second conductor.
  • transfonner of said inverter means includes additionally another of said inverter means includes additionally another input winding and a separate feedback winding inductively disposed around said magnetic core, and wherein another transistor is connected to both said another input winding and said separate feedback winding, said transistors being alternately turned on and off.
  • said gating circuit includes a set of contacts: capable of being open and closed in synchronization with the rotation of the engine, a gating capacitor charged by said source upon the opening of said set of contacts, and a resistor connected to said gating capacitor to be traversed by a charging current for the latter to produce a voltage'applied as a gating signal to said thyristor.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US799260A 1968-02-19 1969-02-14 Ignition device for internal combustion engine Expired - Lifetime US3563221A (en)

Applications Claiming Priority (1)

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JP1968012053U JPS462835Y1 (enrdf_load_stackoverflow) 1968-02-19 1968-02-19

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3677254A (en) * 1969-11-20 1972-07-18 Autoelektronik Ag Thyristor circuit arrangement, especially for periodically switching-in and switching-out a load
US3809044A (en) * 1971-01-22 1974-05-07 Outboard Marine Corp Capacitor triggered ignition system
US6215680B1 (en) * 2000-05-24 2001-04-10 Garmin Corporation Circuit for obtaining a wide dimming ratio from a royer inverter
US6351073B1 (en) * 1999-11-10 2002-02-26 Thomas & Betts International, Inc. Self-supplied DC/DC switching power supply
US20060058941A1 (en) * 1999-04-19 2006-03-16 Dekock Bruce W System for providing traffic information
US7908080B2 (en) 2004-12-31 2011-03-15 Google Inc. Transportation routing
US9784232B1 (en) * 2016-04-01 2017-10-10 Marshall Electric Corp. Forced frequency ignition system for an internal combustion engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131327A (en) * 1964-04-28 Type ignition circuit condenser discharge
US3251351A (en) * 1963-10-14 1966-05-17 Shell Oil Co Electronic ignition system
US3352295A (en) * 1964-08-27 1967-11-14 Mitsubishi Electric Corp Ignition device for internal combustion engine
US3448732A (en) * 1966-09-06 1969-06-10 August C Weiss Capacitor-discharge electronic ignition system and a method for adjusting the circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131327A (en) * 1964-04-28 Type ignition circuit condenser discharge
US3251351A (en) * 1963-10-14 1966-05-17 Shell Oil Co Electronic ignition system
US3352295A (en) * 1964-08-27 1967-11-14 Mitsubishi Electric Corp Ignition device for internal combustion engine
US3448732A (en) * 1966-09-06 1969-06-10 August C Weiss Capacitor-discharge electronic ignition system and a method for adjusting the circuit

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3677254A (en) * 1969-11-20 1972-07-18 Autoelektronik Ag Thyristor circuit arrangement, especially for periodically switching-in and switching-out a load
US3809044A (en) * 1971-01-22 1974-05-07 Outboard Marine Corp Capacitor triggered ignition system
US20060058941A1 (en) * 1999-04-19 2006-03-16 Dekock Bruce W System for providing traffic information
US6351073B1 (en) * 1999-11-10 2002-02-26 Thomas & Betts International, Inc. Self-supplied DC/DC switching power supply
US6215680B1 (en) * 2000-05-24 2001-04-10 Garmin Corporation Circuit for obtaining a wide dimming ratio from a royer inverter
US8606514B2 (en) 2004-12-31 2013-12-10 Google Inc. Transportation routing
US7908080B2 (en) 2004-12-31 2011-03-15 Google Inc. Transportation routing
US8798917B2 (en) 2004-12-31 2014-08-05 Google Inc. Transportation routing
US9709415B2 (en) 2004-12-31 2017-07-18 Google Inc. Transportation routing
US9778055B2 (en) 2004-12-31 2017-10-03 Google Inc. Transportation routing
US9945686B2 (en) 2004-12-31 2018-04-17 Google Llc Transportation routing
US11092455B2 (en) 2004-12-31 2021-08-17 Google Llc Transportation routing
US9784232B1 (en) * 2016-04-01 2017-10-10 Marshall Electric Corp. Forced frequency ignition system for an internal combustion engine
EP3408531A4 (en) * 2016-04-01 2019-02-27 Marshall Electric Corp. FORCED FREQUENCY IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINE

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Publication number Publication date
JPS462835Y1 (enrdf_load_stackoverflow) 1971-02-01

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