IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0746463
(1985-06-20)
|
우선권정보 |
JP-0190639 (1982-10-27); JP-0113174 (1983-06-22) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Mitsubishi Denki Kabushiki Kaisha
|
대리인 / 주소 |
Sughrue, Mion, Zinn, Macpeak & Seas
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
6 |
초록
▼
An ignition system for an outboard internal combustion engine in which the ignition timing is controlled by the throttle setting of the engine. The system includes a signaling coil, which forms a part of a magneto, a thyristor switch for discharging a capacitor which is charged by a generating coil
An ignition system for an outboard internal combustion engine in which the ignition timing is controlled by the throttle setting of the engine. The system includes a signaling coil, which forms a part of a magneto, a thyristor switch for discharging a capacitor which is charged by a generating coil of the magneto to supply ignition current to an ignition coil, and a delay circuit connected between the signaling coil and the thyristor switch. The delay circuit is reset every period of the output of the generating coil, so that, even when the engine rotates at a high speed, the delay operation is positively carried out. As a result, the ignition timing is maintained substantially unchanged irrespective of the speed of the engine, and electromagnetic noise from the signaling coil is greatly suppressed.
대표청구항
▼
1. An ignition system for an internal combustion engine, comprising: a magneto, driven by said engine, and having a generating coil and a signaling coil for generating AC outputs in synchronization with rotation of said engine; an ignition coil; a first capacitor coupled to be charged by an out
1. An ignition system for an internal combustion engine, comprising: a magneto, driven by said engine, and having a generating coil and a signaling coil for generating AC outputs in synchronization with rotation of said engine; an ignition coil; a first capacitor coupled to be charged by an output of said generating coil; first switching means for, when rendered conductive, discharging said first capacitor to operate said ignition coil; a delay circuit, comprising a resistor and a second capacitor, for delaying an output of said signaling coil, an output of said delay circuit being applied to said first switching means to render said first switching means conductive; and second switching means for, after said first capacitor is discharged and in response to outputs of said generating coil and said signaling coil, resetting said delay circuit to fully discharge said second capacitor each time said first capacitor is discharged. 2. The ignition system as claimed in claim 1, wherein said first switching means comprises a thyristor, and wherein said second capacitor coupled between a gate and cathode of said thyristor. 3. The ignition system as claimed in claim 2, wherein said second switching means comprises a transistor having a base coupled to an output of said signaling coil and a collector coupled to said gate of said thyristor. 4. The ignition system as claimed in claim 3, further comprising a series circuit of diodes coupled in parallel with said generating coil, said series circuit of diodes operating to short circuit a half of each cycle of said AC output of said generating coil which does not contribute to charging of said first capacitor, an intermediate point within said series of diodes being coupled to said base of said transistor. 5. An ignition system for an internal combustion engine comprising: a magneto, driven by said engine, having a generating coil and a signaling coil for generating AC outputs in synchronization with rotation of said engine; an ignition coil; a first capacitor coupled to be charged by an output of said generating coil; first switching means for, when rendered conductive, discharging said first capacitor to operate said ignition coil; a delay circuit, comprising a resistor and a second capacitor, for delaying an output of said signaling coil, an output of said delay circuit being applied to said first switching means to render said first switching means conductive; second switching means for resetting said delay circuit to fully discharge said second capacitor each time said first capacitor is discharged; a third capacitor and a first diode, said first diode coupling said third capacitor to be charged by a half of each cycle of said AC output of said generating coil which does not contribute to charging of said first capacitor, said third capacitor being coupled to said second switching means to render said record switching means conductive when said third capacitor is discharged; and a second diode for passing only said half cycle of said AC output of said generating coil which does not contribute to the charging of said first capacitor, for reversely biasing said second switching means, thereby to render said second switching means nonconductive during said half cycle of said AC output which does not contribute to the charging of said first capacitor. 6. The ignition system as claimed in claim 5, wherein said first switching means comprises a thyristor and a second capacitor coupled between a gate and cathode of said thyristor. 7. The ignition system as claimed in claim 6, wherein said second switching means comprises a transistor having a base coupled through a resistor to one terminal of said third capacitor and coupled through a third diode to one terminal of said generating coil, and a collector connected to said gate of said thyristor.
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