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Patent US5074274A successfully refreshed from Google Patents.
US5074274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition system for internal combustion engines
Assignee: Mitsubishi Electric Corp
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Filing: 1991-02-21
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Granted: 1991-12-24
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Expires: 2011-02-21
Abstract
Abstract An ignition system for internal combustion engines comprising an ignition coil (38), a power circuit (30) including a converter for converting the output of a battery (31) into a high voltage, a capacitor (37) arranged at the primary side of the ignition coil (38) and charged by the output from the power circuit (30), a discharging control thyristor (41) which conducts at a spark-timing of an internal combustion engine to discharge electric charges in the capacit of (37) into the primary winding (38a) of the ignition coil (38) and converter control means (49, 52) which makes the converter inactive earlier than the input of a trigger signal to the gate of the thyristor (41) by a first predetermined time (t 1 ), and which makes the converter active again in a second predetermined time (t 2 ) since the thyristor (41) has been triggered to conduct.
Inventors
- 👤 Hiroshi Okuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:20
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/06; F02P3/08; F02P3/0853; F02P3/0861; F02P3/02; F02P3/04; F02P3/045; F02P3/0453
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
An ignition system for internal combustion engines comprising: an ignition coil (38); a power circuit (30) including a converter for converting the output of a battery (31) into a high voltage; a capacitor (37) arranged at the primary side of the ignition coil (38) and charged by the output from the power circuit (30); a discharging control thyristor (41) which conducts at a spark-timing of an internal combustion engine to discharge electric charges in the capacitor (37) into the primary winding (38a) of the ignition coil (38); and converter control means (49, 52) which makes the converter inactive earlier than the input of a trigger signal to the gate of the thyristor (41) by a first predetermined time (t 1 ), and which makes the converter active again in a second predetermined time (t 2 ) since the thyristor (41) has been triggered to conduct.
Claim 2
Dependent Claim
145 words
An ignition system for internal combustion engines comprising: an ignition coil (38); a power circuit (30) including a converter for converting the output of a battery (31) into a high voltage; a capacitor (37) arranged at the primary side of the ignition coil (38) and charged by the output from the power circuit (30); a discharging control thyristor (41) which conducts at a spark-timing of an internal combustion engine to discharge electric charges in the capacitor (37) into the primary winding (38a) of the ignition coil (38); and converter control means (49, 52) which makes the converter inactive earlier than the input of a trigger signal to the gate of the thyristor (41) by a first predetermined time (t 1 ), and which makes the converter active again in a second predetermined time (t 2 ) since the thyristor (41) has been triggered to conduct.
Claim 3
Dependent Claim
20 words
An ignition system according to claim 1, wherein the converter includes a transformer (32) which has a feedback coil (32c).
Claim 4
Dependent Claim
28 words
An ignition system according to claim 2, wherein the converter includes an oscillation transistor (33), and the oscillation transistor has the base connected to the feedback coil (32c).
Claim 5
Dependent Claim
27 words
An ignition system according to claim 3, wherein the converter control means includes a delay circuit (49) which has the first predetermined delay time (t 1 ).
Claim 6
Dependent Claim
28 words
An ignition system according to claim 4, wherein the converter control means includes an oscillation stoppage circuit (52) which has the second predetermined delay time (t 2 ).
Claim 7
Dependent Claim
24 words
An ignition system according to claim 5, wherein the oscillation stoppage circuit (52) has an output transmitted to the base of the transistor (33).
Claim 8
Dependent Claim
29 words
An ignition system according to claim 4, further including a signal coil (42) whose signal is transmitted to the gate of the thyristor (41) through the delay circuit (49).
Claim 9
Dependent Claim
23 words
An ignition system according to claim 5, further including a signal coil (42) whose signal is transmitted to the oscillation stoppage circuit (52).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |