US3750638A - Transistorized ignition device of an internal combustion engine - Google Patents

Transistorized ignition device of an internal combustion engine Download PDF

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Publication number
US3750638A
US3750638A US00238454A US3750638DA US3750638A US 3750638 A US3750638 A US 3750638A US 00238454 A US00238454 A US 00238454A US 3750638D A US3750638D A US 3750638DA US 3750638 A US3750638 A US 3750638A
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United States
Prior art keywords
contact point
transistor
capacitor
ignition
internal combustion
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Expired - Lifetime
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US00238454A
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English (en)
Inventor
M Tanaka
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Nippon Denko Co Ltd
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Nippon Denko Co Ltd
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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
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F02P3/0407—Opening or closing the primary coil circuit with electronic switching means
    • F02P3/0435—Opening or closing the primary coil circuit 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
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F02P3/055—Layout of circuits with protective means to prevent damage to the circuit, e.g. semiconductor devices or the ignition coil
    • F02P3/0552—Opening or closing the primary coil circuit with semiconductor devices
    • F02P3/0556—Protecting the coil when the engine is stopped

Definitions

  • ABSTRACT A transistorized ignition device for an internal combustion engine.
  • a dc power source, an engine switch, a grounded contact point, an ignition coil, and an ignition transistor are connected in series for supplying an electric current to a primary winding of said ignition coil from said dc power source when the circuit is conducting.
  • a controlling transistor is coupled in the circuit for controlling the operation of the ignition transistor, the controlling transistor being switched according to opening and closing of the contact point and holding the ignition transistor in a non-conducting state when the contact point is in an open position.
  • a capacitor is connected in parallel with the contact point and is charged when the contact point is in the open position.
  • the capacitor is further connected to the output of the controlling transistor, and a diode is connected be-, tween the capacitor and the contact point in the forward direction relative to the charging current for the capacitor. Upon the closing of the contact point the ignition transistor is made conductive by means of the charge on the capacitor.
  • an engine switch has at least three positions, namely neutral position in which the ignition device is not energized, a first ON position in which the ignition device is energized, and a second ON position in which a cell motor is energized.
  • the engine switch may be switched to said first ON position without causing trouble ifa contact point is in an open position at that time, and may be maintained in this first ON position for a long time unintentionally or for a particular purpose, for instance to listen to a radio installed in a vehicle.
  • the object of the present invention is to provide a novel transistorized ignition device of an internal combustion engine which prevents flowing of large electric current through an ignition transistor regardless of whether a contact point is in an open or closed position when an engine switch is switched to said first ON position to thereby eliminate the defect of the conventional transistorized ignition device of the internal combustion engine as described above.
  • FIG. I is a circuit diagram of a conventional transistorized ignition device of an internal combustion engine.
  • FIG. 2 is a circuit diagram of a transistorized ignition device of an internal combustion engine embodying the present invention.
  • FIG. 1 shows a circuit diagram of the conventional transistorized ignition device, in which a reference numeral I designates a dc power source for igniting the internal combustion engine.
  • the dc power source I is connected in series with an engine switch 2 and a con tact point 3 which is grounded.
  • 4, 5 and 6 are transistors. in which 6 is an ignition transistor which, in a conducting state thereof, supplies an electric current to a primary winding 71 of an ignition coil 7 from the dc power source I, and 4 is a controlling transistor for controlling an operation of said ignition transistor 6.
  • a reverse voltage generated at the primary winding 71 of the ignition coil 7 is grounded through a diode 15.
  • the reverse voltage is also attenuated by a capacitor 16.
  • 17 is another capacitor for preventing generation of spark at the contact point 3.
  • the contact point 3 is in a closed position when the engine switch 2 is switched to the said first ON position, an electric current flows from the dc power source 1 through the engine switch 2, the resistor 8 and the contact point 3. Therefore, the base voltage of the controlling transistor 4 becomes substantially to the ground voltage, so that the controlling transistor 4 does not conduct. Thus, the base voltage of the transistor 5 is increasedcausing it to conduct. Thus, the ignition transistor 6 becomes also conducted, and then an electric current flows through the primary winding 71 of the ignition coil 7. If the device is held at this state for a long time, a large amount of heat isgenerated due to a large electric current flowing through the transistors 5 and 6 and the primary winding 71, so that the transistors 5 and6 may be destroyed. Further, at the same time, a battery used as the dc power source I is over discharged and a power supplying ability thereof is lowered.
  • the device of the present invention eliminates such defects of the conventional ignition device, as described hereinbefore, and the embodiment of the invention is described in the following with referring to FIG. 2.
  • FIG. 2 the same or corresponding elements to those of FIG. I are designated by the same reference numerals as those of FIG. 1.
  • a capacitor 18 is connected in parallel with the contact point 3.
  • One terminal of said capacitor 18 is connected to an output terminal 41 of the controlling transistor 4 through a resistor 11, and to the ungrounded terminal of the contact point 3 through a diode 19 for preventing reverse current.
  • the transistors 5 and 6 are kept still in non-conducting state even when the engine switch 2 is further rotated into the said second ON position in order to start a cell motor to open and close the contact point 3, and, therefore, the internal combustionengine does not operate.
  • the capacitor 18 is provided to dissolve such a problem.
  • the capacitor 18 When the contact point 3 is in the open position, the capacitor 18 is charged in parallel with conduction of the controlling transistor 4; That is, when the cell motor is operated and thereby the contact point 3 is operated to open and close, the capacitor 18 is, charged during every opening of the contact point 3 by the dc power source 1 through the engine switch 2, the resistor 8 and the diode 19.
  • the controlling transistor 4 when the contact point 3 is in the open position, the controlling transistor 4 is in a conducting state and the transistors 5 and 6 are in a non-conducting state, respectively. During this period of time, the capacitor 18 is charged.
  • the controlling transister 4 When the contact point 3 is closed by means of the cell motor, the controlling transister 4 is put in a non-conducting state as described hereinbcfore. But, because the capacitor 18 is connected to the output terminal of the controlling transistor 4 through the resistor 11, the base voltage of the transistor 5 is increased and so the transistor 5 conducts. Then, the electric charge stored in the capacitor 18 is discharged as a base current of the transistor 5. At this time, the discharge current of the capacitor 18 does not flow to the contact point 3 because it is prevented by the diode 19.
  • the transistor 5 when the transistor 5 conducts the ignition transistor 6 also conducts and an electric current flows through the primary winding 71 of the ignition coil 7. Accordingly, a large voltage is induced at a secondary winding 72 ot the ignition coil 7. Such an operation is similarly carried out during usual operation of the internal combustion engine.
  • a discharging time constant of the capacitor 18 is determined by a capacitance of the capacitor 18 and a resistance of the resistor 11, and it is required that said discharging time constant is set to be larger than a period of time during which the contact point 3 is closed at the minimum rotation speed of the internal combustion engine.
  • a charging time constant of the capacitor 18 is determined by the capacitance of the capacitor 18 and a resistance of the resistor 8, and it is required that said charging time constant is set to be smaller than a period of time during which the contact point 3 is opened at the maximum rotation speed of the internal combustion engine.
  • a transistorized ignition device of an internal combustion engine comprising a series connection consisting' of a dc power source, an engine switch, and a grounded contact point, an ignition coil, an ignition transistor for supplying an electric current to a primary winding of said ignition coil from said dc power source when beingconducted, and a controiling transistor for controlling an operation of said ignition transistor, said controlling transistor being switched according to opening and closing of said contact point and holding said ignition transistor in non-conducting state during said contact point is in an open position, characterized in that it comprises a capacitor connected in parallel with said contact point and adopted to be charged during said contact point is in the open position, said capacitor being further connected to an output of said controlling transistor, and a diode connected between said capacitor and said contact point in a forward direction relative to a charge current of said capacitor, wherein at closing of said contact point said ignition transistor being put in a conducting state by means of the charged voltage of said capacitor.
  • a transistorized ignition device of an internal combustion engine characterized in that a discharging time constant of said capacitor is larger than a closing time of said contact point at minimum rotation speed of the internal combustion engine.
  • a transistorized ignition device of an internal combustion engine characterized in that a charging time constant of said capacitor is smaller than an opening time of said contact point at maximum rotation speed of the internal combustion engine.
US00238454A 1971-06-19 1972-03-27 Transistorized ignition device of an internal combustion engine Expired - Lifetime US3750638A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971052826U JPS5038657Y2 (ja) 1971-06-19 1971-06-19

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US3750638A true US3750638A (en) 1973-08-07

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US00238454A Expired - Lifetime US3750638A (en) 1971-06-19 1972-03-27 Transistorized ignition device of an internal combustion engine

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JP (1) JPS5038657Y2 (ja)
GB (1) GB1371431A (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949722A (en) * 1973-08-07 1976-04-13 Robert Bosch G.M.B.H. Semiconductor controlled ignition systems for internal combustion engines
CN1680707B (zh) * 2004-04-08 2010-05-12 株式会社电装 用于内燃机的点火装置
CN102384000A (zh) * 2011-10-14 2012-03-21 成都市翻鑫家科技有限公司 触点式电子点火系统

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48106643U (ja) * 1972-03-10 1973-12-11
JPS544327Y2 (ja) * 1975-11-24 1979-02-26
JPS5457807U (ja) * 1977-09-30 1979-04-21
JPH0253452U (ja) * 1988-10-13 1990-04-18

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3238416A (en) * 1962-12-06 1966-03-01 Gen Motors Corp Semiconductor ignition system
US3253185A (en) * 1960-12-05 1966-05-24 Bendix Corp Transistor ignition system and pulse generator therefor
US3324351A (en) * 1964-02-19 1967-06-06 Jr Henry D Pahl Unit impulse ignition systems
US3367313A (en) * 1964-03-17 1968-02-06 Philips Corp Device for producing highvoltage pulses

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253185A (en) * 1960-12-05 1966-05-24 Bendix Corp Transistor ignition system and pulse generator therefor
US3238416A (en) * 1962-12-06 1966-03-01 Gen Motors Corp Semiconductor ignition system
US3324351A (en) * 1964-02-19 1967-06-06 Jr Henry D Pahl Unit impulse ignition systems
US3367313A (en) * 1964-03-17 1968-02-06 Philips Corp Device for producing highvoltage pulses

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949722A (en) * 1973-08-07 1976-04-13 Robert Bosch G.M.B.H. Semiconductor controlled ignition systems for internal combustion engines
CN1680707B (zh) * 2004-04-08 2010-05-12 株式会社电装 用于内燃机的点火装置
CN102384000A (zh) * 2011-10-14 2012-03-21 成都市翻鑫家科技有限公司 触点式电子点火系统

Also Published As

Publication number Publication date
GB1371431A (en) 1974-10-23
JPS4811223U (ja) 1973-02-08
DE2223303A1 (de) 1972-12-21
DE2223303B2 (de) 1975-12-04
JPS5038657Y2 (ja) 1975-11-08

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