US3924595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic turn-off for transistorized ignition systems for internal combustion engines
Assignee: BBC Brown Boveri AG Germany
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Filing: 1974-06-03
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Granted: 1975-12-09
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Expires: 1994-06-03
Abstract
Abstract A d-c energized ignition system for internal combustion engines is first provided with negative feedback means for stabilizing the energizing current flowing through the primary winding of the ignition coil, and is secondly provided with means for automatically interrupting the current flow through the primary winding of the ignition coil in case that the operation of the internal combustion engine is interrupted at a point of time when the cooperating contacts of the interrupter are in engagement.
Inventors
- 👤 Heinrich-Josef Brungsberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:13
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/02; F02P3/04; F02P3/055; F02P3/0552; F02P3/0556; F02P3/05; F02P3/051
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
285 words
An ignition system for internal combustion engines including a. an ignition coil (9) having a primary winding (9a) and a secondary winding (9b); b. a power transistor (7) having a current path arranged in series with said primary winding for controlling the flow of current through said primary winding; c. a first auxiliary transistor (4) controlling the current flow through said power transistor (7); d. an interrupter (1) having relatively movable contacts; e. a second auxiliary transistor (30), said second auxiliary transistor (30) and said first auxiliary transistor (4) being cascade connected and said second auxiliary transistor having a current path including a capacitor (30) and said interrupter (1) arranged in series relation, whereby current flow through said second auxiliary transistor (30) is interrupted when said interrupter (1) is in the closed position thereof and said capacitor (33) charged; f. a discharge circuit for said capacitor (33) including a first diode (32) for discharging said capacitor (33) in response to reopening of said interruptEr; g. a first resistor (19) arranged in series with said interrupter (1); h. one end of said first resistor (19), the emitter (4a) of said first auxiliary transistor (4) and the cathode of said diode (32) being connected to a common terminal (17,41); i. the base (4b) of said first auxiliary transistor (4) being connected to the emitter (30a) of said second auxiliary transistor (30); j. the base (30b) of said second auxiliary transistor (30) being connected by the intermediary of a second resistor (31) and said capacitor (33) to the other end of said first resistor (19); and k. the collector (30c) of said second auxiliary transistor (30) being directly connected to said other end of said first resistor (19).
Claim 2
Dependent Claim
285 words
An ignition system for internal combustion engines including a. an ignition coil (9) having a primary winding (9a) and a secondary winding (9b); b. a power transistor (7) having a current path arranged in series with said primary winding for controlling the flow of current through said primary winding; c. a first auxiliary transistor (4) controlling the current flow through said power transistor (7); d. an interrupter (1) having relatively movable contacts; e. a second auxiliary transistor (30), said second auxiliary transistor (30) and said first auxiliary transistor (4) being cascade connected and said second auxiliary transistor having a current path including a capacitor (30) and said interrupter (1) arranged in series relation, whereby current flow through said second auxiliary transistor (30) is interrupted when said interrupter (1) is in the closed position thereof and said capacitor (33) charged; f. a discharge circuit for said capacitor (33) including a first diode (32) for discharging said capacitor (33) in response to reopening of said interruptEr; g. a first resistor (19) arranged in series with said interrupter (1); h. one end of said first resistor (19), the emitter (4a) of said first auxiliary transistor (4) and the cathode of said diode (32) being connected to a common terminal (17,41); i. the base (4b) of said first auxiliary transistor (4) being connected to the emitter (30a) of said second auxiliary transistor (30); j. the base (30b) of said second auxiliary transistor (30) being connected by the intermediary of a second resistor (31) and said capacitor (33) to the other end of said first resistor (19); and k. the collector (30c) of said second auxiliary transistor (30) being directly connected to said other end of said first resistor (19).
Claim 3
Dependent Claim
63 words
An ignition system as specified in claim 1 including a second diode (29) arranged to preclude the application of a potential to said emitter (4a) of said first auxiliary transistor (4) and to the cathode of said first diode (32) which is negative relative to the potential prevailing across said first auxiliary transistor (4) and the potential prevailing across said first diode (32).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |