US3761779A - Flywheel magneto ignition apparatus operating with capacitive ignition effect - Google Patents

Flywheel magneto ignition apparatus operating with capacitive ignition effect Download PDF

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Publication number
US3761779A
US3761779A US00269131A US3761779DA US3761779A US 3761779 A US3761779 A US 3761779A US 00269131 A US00269131 A US 00269131A US 3761779D A US3761779D A US 3761779DA US 3761779 A US3761779 A US 3761779A
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United States
Prior art keywords
diode
ignition
coil
capacitor
flywheel
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Expired - Lifetime
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US00269131A
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English (en)
Inventor
H Carlsson
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Svenska Electromagneter AB
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Svenska Electromagneter AB
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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
    • F02P1/00—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage
    • F02P1/08—Layout of circuits
    • F02P1/086—Layout of circuits for generating sparks by discharging a capacitor into a coil circuit
    • 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

Definitions

  • a flywheel magneto ignition system includes a genera- [30 F i Application p i Data tor coil about which a magnetic field rotates, a first July 5 swedfin 8698/71 diode connecting a capacitor and the primary winding of an ignition coil to said generator coil, a second diode [52] U S Cl 317/81 123/149 310/15 connected across said generator coil for conducting .3.l 315/24 317 317/96 current pulses blocked by said first diode, a spark plug I 320/1 336/1 of the surface type connected in circuit with the sec- [51] Int CI g llzsg 3/00 ondary winding of the ignition coil, and a control mem- [58] Field 96 her actuated in respnse to flywheel rotation for controll23/l46 5 3 15/506 ling current flow to the capacitor and primary winding,
  • a low-voltage primary current is stepped up in an ignition coil to an operating voltage of 8 to 9 kilovolts.
  • the source of the primary current may be a battery, a DC generator or a magneto. Magnetos are commonly used in e.g. motor cycle and motor bike motors, outboard motors, small-size stationary or tractor motors for various types of auxiliary implements and the like.
  • systems of this type are provided with a breaker device adapted to rotate on the motor shaft or synchronously in connection therewith, said breaker device being adapted to break the primary current to the ignition coil thereby causing a quick magnetic flux change to take place in the iron core thereof so that an ignition voltage is induced in the secondary winding
  • ignition systems of this type have been considered as being inductive ignition systems irrespective of the fact that a condenser always is connected across the contacts of the breaker in order to attenuate the spark formation which otherwise always will take place due to the voltage peaks inductively produced at the mo-' ment the contacts close and open.
  • the charge received by the condenser during breaking is again fed to the primary circuit and contributes to the energy conversion in the ignition coil, i.e. to increase the ignition spark.
  • spark plugs are additionally provided with a preliminary spark gap provided within the plug and adapted to bring about a change of distribution between current and voltage to produce a higher overall voltage during spark-over. This distribution effect appears to be of essential importance in condenser systems.
  • Capacitive ignition systems are essentially based on the fact that during each ignition a preliminarily charged condenser is discharged over the primary winding to an ignition coil due to the fact that a control member closes the circuit.
  • the control member may comprise a mechanical means corresponding to the breaker switch previously mentioned in connection with inductive ignition systems or it may comprise an electronic circuit including, for example, a thyristor, a diode and a trigger coil which for a flywheel magneto ignition apparatus is disposed in the magnetic field of the flywheel so that a position-determined pulse induced in the trigger coil is rectified by the diode and renders the thyristor conductive for the primary current.
  • the electronic circuit and all the component parts thereof may be completely cast into a block of thermosetting resin, such as epoxy resin, and is thus adapted to be attached as a compact and extremely reliable unit within or outside of the flywheel.
  • the charging voltage of the condenser In order to satisfy the energy requirement the charging voltage of the condenser must be on a sufficiently high level. A value of, for example, 1000 volts would be desirable. While such a voltage level is actually obtainable, it entails on the other hand an unpermissible increase of the electronic components (such as the thyristor and diode) and, for this reason, the charging voltage of the condenser in practice must be limited to a maximum of 500 volts.
  • a generator coil in the rotating field of the flywheel.
  • the alternating voltage generated in the generator coil is rectified in a first diode and the current is fed into the condenser, the control member in the primary circuit being open during this phase of operation.
  • the supplied current has the character of a positive half wave pulse having a voltage proportional to the number of revolutions of the flywheel.
  • a second diode may be provided which is connected in parallel overthe generator coil and which produces a current migration of the negative half wave through the generator coil, this energy being consumed by the inductance and essentially transformed into heat. In this way the voltage amplitude of the negative half wave may be minimized and the voltage charge of the first diode reduced.
  • FIG. 2 shows the same circuit diagram as FIG. 1, however, having the control member constructed as an electronic circuit comprising a thyristor and a trigger coil with a diode connected in series.
  • FIG. 3 shows a diagram indicating the relationship between voltage and number of revolutions from a generator coil of the system as illustrated in respectively FIGS. 1 and 2.
  • FIG. 4 shows a diagram of the charging voltage from a generator coil belonging to the system according to respectively FIGS. 1 and 2 to a condenser, a negative, diode-controlled half wave and a positive half wave being illustrated.
  • FIG. 5 is a diagram showing in relation to time the ignition voltage emanating from an ignition coil provided in the system according to respectively FIGS. 1 and 2.
  • a generator coil 1 having an iron core 2 is connected by a first terminal to ground at 3 and by another terminal to a branch point 4. From branch point 4 a line extends to a first diode 5 and another line to a second diode 6. This latter diode is connected to ground at 7. The first diode 5 is connected to another branch point 8. Both diodes 5 and 6 are adapted to conduct current in a direction indicated by the arrow in the diode symbols and to block flow of current in the opposite direction.
  • a line extending from branch point 8 leads to a mechanical control member generally designated as 9 and comprising a contact arm 10 adapted respectively to open and close a line 11 connected to ground at 12.
  • Contact arm 10 is operated by a cam member 29 provided on the motor shaft and firmly connected thereto and rotating therewith, the construction of the contact arm 10 and cam member being such that for every ignition the cam by means of contact arm 10 brings about a breaking and closing action between branch point 8 and ground connection 12.
  • the closing action in this case takes place in the exact instant when the ignition in the cylinder is to be performed.
  • the breaking action is to take place at an instant defined below.
  • FIG. 2 there is shown an alternative embodiment of the conrol member comprising a thyristor 13 which is connectedto ground at a point 14; Opening and closing of thyristor 13 is determined by a current pulse from a trigger coil 15 provided with an iron core 15' and by means of a terminal connected to ground at 16 and by another terminal connected to a branch point 17 via a diode 17'.
  • a predetermined resistance 18 is connected between point 17 and the line connecting thyristor l3 and ground connection 14, resistor 18 determining the voltage from trigger coil 15 at which the thyristor 13 will respectively break and close the current in the direction from brach point 8 to ground connection 14.
  • a condenser 19 is connected on the one hand to branch point 8 and on the other hand to a branch point 20.
  • An ignition coil generally designated as 23 and having an iron core 24 is attached by means of one terminal from a primary winding 21 and one terminal from a secondary winding 22 to branch point 20.
  • Another terminal from primary winding 21 is connected to ground at 25 and another terminal from secondary winding 22 is connected to an electrode 26 insulated in relation to ground and belonging to a surface spark plug generally designated as 27 the other electrode 28 of which is connected to ground.
  • FIGS. 1 and 2 the exemplary systems shown are identical except as far as the control members are concerned.
  • the generator coil 1 is so disposed in the rotating field emanating from a flywheel conventionally comprising permanent magnets, that an alternating current is produced in the generator coil 1.
  • trigger coil 5 must be suitably disposed in the rotating field of the flywheel in such a way that the required voltage change acting respectively to open and to close the thyristor is obtained in the exactly correct instance of time required by the invention.
  • the voltage generated in the generator coil 1 is dependent on the number of revolutions of the flywheel in a way fundamentally shown in FIG. 3 in which a curve A indicates the voltage along an axis V independence of the number of revolutions along an axis n.
  • V a maximum value
  • the voltage quickly goes up to a maximum value V, of for example 500 volts and thereafter decreases slightly due to the increase of the inductance in the coil circuit caused-by the increased cycle number.
  • the voltage wave which is generated upon every complete magnetic field passage in the generator coil is illustrated in FIG. 4 by a curve generally designated as B, the time T being indicated on an x-axis and the voltage being plotted on a y-axis.
  • a negative half wave is designated as B, and a positive half wave as B, the provision being made as far as the negative half wave B, is concerned that the second diode 6 is completely disconnected from the circuit of the generator coil ll.
  • the two half waves B, and B will be fully congruent but inverted.
  • the circuit comprising the second diode 6 and the generator coil l is closed, the negative half wave B, producing a current via the diode through the generator coil ll causing the voltage to be reduced as fundamentally indicated by curve B in FIG. 4.
  • This current and the voltage reduction produced are dependent on the windings of the coil, the dimensions of the wire, the iron core etc. and may be varied within certain limits. It is also possible to achieve by outer resistors or similar devices such an adaptation that the most appropriate course of curve B in respect to the invention is obtained.
  • control member 9 and 13 respectively open at or immediately after the instant when curve B has arrived at its negative maximum, i.e.
  • the voltage development during discharge is illustrated in FIG. 5 as a function of time, the voltage V being plotted along an y-axis and time T along a x-axis.
  • a solid line curve 13; represents a normal voltage development during a spark-over in the spark plug, a maximum value V,,possibly being found at 18 to 20 kilovolts.
  • a broken curve B indicates the voltage marginally present with a voltage top V of for example 30 kilovolts.
  • the trigger coil 15 is arranged so that the diode will respectively open and close at the described moments.
  • a flywheel magneto ignition system for an internal combustion engine comprising:
  • an ignition coil having a primary winding in circuit with the other side of said capacitor, and having a secondary winding
  • a control member actuated in response to flywheel rotation for controlling current flow to said capacia capacitor connected at one side to receive cur-.
  • control member being synchronized with the rotating field to initiate charging of the capacitor when a voltage pulse conducted by said second diode has just reached its maximum potential.
  • control member is a switch controlled by a cam on the flywheel shaft and synchronously rotating therewith.
  • cam is shaped to open said switch to initiate said charging and to close said switch when said capacitor is fully charged and ignition is to take place.
  • control member comprises:
  • At least one trigger coil disposed in said rotatable field and connected in series with each other.
  • a system according to claim 4 in which said trigger coil is so disposed in the rotatable field as to open said thyristor to initiate said charging and to close said thyristor when said capacitor is fully charged and ignition is to take place.

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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)
  • Permanent Magnet Type Synchronous Machine (AREA)
US00269131A 1971-07-05 1972-07-05 Flywheel magneto ignition apparatus operating with capacitive ignition effect Expired - Lifetime US3761779A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE08698/71A SE354098B (ja) 1971-07-05 1971-07-05

Publications (1)

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US3761779A true US3761779A (en) 1973-09-25

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Country Status (8)

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US (1) US3761779A (ja)
JP (1) JPS4828832A (ja)
DE (1) DE2233003B2 (ja)
ES (1) ES404555A1 (ja)
FR (1) FR2145260A5 (ja)
GB (1) GB1403377A (ja)
IT (1) IT964519B (ja)
SE (1) SE354098B (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884207A (en) * 1973-09-06 1975-05-20 Systematics Inc Magneto-generator ignition system
US4095577A (en) * 1976-03-02 1978-06-20 Anderson Harold E Capacitor discharge ignition method and apparatus
US20030089336A1 (en) * 2001-11-13 2003-05-15 Leo Kiessling Microelectronic ignition method and ignition module with ignition spark burn-time prolonging for an internal combustion engine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE389894B (sv) * 1975-04-25 1976-11-22 Svenska Electromagneter Kopplingssystem vid elektroniska tendapparater
JPS53769U (ja) * 1976-06-22 1978-01-06
US4400715A (en) * 1980-11-19 1983-08-23 International Business Machines Corporation Thin film semiconductor device and method for manufacture
JPS5891631A (ja) * 1981-11-27 1983-05-31 Hitachi Ltd 半導体装置
JPS6169149A (ja) * 1985-09-06 1986-04-09 Nec Corp 集積回路装置の製造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2536468A (en) * 1947-12-10 1951-01-02 Russell Stanley Alexander Electromagnetic ignition apparatus for fuel gas
US3065382A (en) * 1960-10-18 1962-11-20 C R O Engineering Co Inc Automatic flame igniter
US3500086A (en) * 1966-02-05 1970-03-10 Max Baermann Magneto - electric pulse generator especially for igniting gas-operated devices
US3508116A (en) * 1968-09-09 1970-04-21 Phelon Co Inc Inductively triggered breakerless ignition system with variable magnetic shunt
US3584929A (en) * 1969-12-29 1971-06-15 Motorola Inc Spark duration for capacitor discharge ignition systems
US3596133A (en) * 1969-09-30 1971-07-27 Glenn B Warren Solid-state multispark ignition

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2536468A (en) * 1947-12-10 1951-01-02 Russell Stanley Alexander Electromagnetic ignition apparatus for fuel gas
US3065382A (en) * 1960-10-18 1962-11-20 C R O Engineering Co Inc Automatic flame igniter
US3500086A (en) * 1966-02-05 1970-03-10 Max Baermann Magneto - electric pulse generator especially for igniting gas-operated devices
US3508116A (en) * 1968-09-09 1970-04-21 Phelon Co Inc Inductively triggered breakerless ignition system with variable magnetic shunt
US3596133A (en) * 1969-09-30 1971-07-27 Glenn B Warren Solid-state multispark ignition
US3584929A (en) * 1969-12-29 1971-06-15 Motorola Inc Spark duration for capacitor discharge ignition systems

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884207A (en) * 1973-09-06 1975-05-20 Systematics Inc Magneto-generator ignition system
US4095577A (en) * 1976-03-02 1978-06-20 Anderson Harold E Capacitor discharge ignition method and apparatus
US20030089336A1 (en) * 2001-11-13 2003-05-15 Leo Kiessling Microelectronic ignition method and ignition module with ignition spark burn-time prolonging for an internal combustion engine
US6701896B2 (en) * 2001-11-13 2004-03-09 Prufrex-Elektro-Apparatebau, Inh. Helga Müller, geb. Dutschke Microelectronic ignition method and ignition module with ignition spark burn-time prolonging for an internal combustion engine

Also Published As

Publication number Publication date
FR2145260A5 (ja) 1973-02-16
DE2233003A1 (de) 1973-01-25
DE2233003B2 (de) 1975-06-19
GB1403377A (en) 1975-08-28
SE354098B (ja) 1973-02-26
ES404555A1 (es) 1975-07-01
JPS4828832A (ja) 1973-04-17
IT964519B (it) 1974-01-31

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