US3901205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized and transistorized ignition system for internal combustion engines
Assignee: BBC Brown Boveri AG Germany
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Filing: 1974-06-03
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Granted: 1975-08-26
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Expires: 1994-06-03
Abstract
Abstract A transistorized ignition system for internal combustion engines is provided with a first voltage divider including a Zener diode for establishing a fixed voltage standard and with a second voltage divider to which said fixed voltage standard is applied. The second voltage divider includes a series arrangement of a fixed resistor and a temperature sensitive resistor and thus provides a set voltage that varies with temperature. This voltage is compared with a voltage proportional to the current flow in the primary winding of the ignition coil. This current flow is regulated by cascade connected transistors in accordance with the set point or set voltage established by said second voltage divider.
Inventors
- 👤 Heinrich-Josef Brungsberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:35
CPC Classifications
F; F02; F02P; F02P15/00; F02P15/12; F02P3/00; F02P3/02; F02P3/04; F02P3/05; F02P3/051
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
271 words
An ignition system for internal combustion engines to be energized by a d-c power supply comprising a. a pair of d-c power supply terminals (17,18) b. a first voltage divider circuit connected to said d-c supply terminals (17,18) and including a series arrangement of a first resistor (19), a Zener diode (40) and an interrupter (1); c. a second voltage divider circuit connected across said Zener diode (40) and including a series arrangement of a second resistor (39) having a substantially fixed ohmic value and of a third resistor (38) having an ohmic value that changes substantially with changing temperatures; d. a first transistor (30) and a second transistor (35) connected to said second voltage divider circuit with the bases (30b,35b) thereof, the collector (30c) of said first transistor (30) and the collector (35c) of said second transistor (35) being interconnected, and said third resistor (38) being arranged in the base emitter current path (35b,35a) of said second transistor (35); e. a third transistor (4) under the control of said first transistor (30); f. an ignition coil (9) having a primary winding (9a) energized from said d-c power supply terminals (17,18) and a secondary winding (9b); g. a fourth transistor (7) and a feedback resistor (8) both arranged in series with said primary winding (9a) of said ignition coil (9), said fourth transistor (7) being under the control of said third transistor (4) and controlling the current flow through said primary winding (9a) of said ignition coil (9); and h. a diode (36) applying the potential prevailing across said feedback resistor (8) to the emitter (35a) of said second transistor (35).
Claim 2
Dependent Claim
271 words
An ignition system for internal combustion engines to be energized by a d-c power supply comprising a. a pair of d-c power supply terminals (17,18) b. a first voltage divider circuit connected to said d-c supply terminals (17,18) and including a series arrangement of a first resistor (19), a Zener diode (40) and an interrupter (1); c. a second voltage divider circuit connected across said Zener diode (40) and including a series arrangement of a second resistor (39) having a substantially fixed ohmic value and of a third resistor (38) having an ohmic value that changes substantially with changing temperatures; d. a first transistor (30) and a second transistor (35) connected to said second voltage divider circuit with the bases (30b,35b) thereof, the collector (30c) of said first transistor (30) and the collector (35c) of said second transistor (35) being interconnected, and said third resistor (38) being arranged in the base emitter current path (35b,35a) of said second transistor (35); e. a third transistor (4) under the control of said first transistor (30); f. an ignition coil (9) having a primary winding (9a) energized from said d-c power supply terminals (17,18) and a secondary winding (9b); g. a fourth transistor (7) and a feedback resistor (8) both arranged in series with said primary winding (9a) of said ignition coil (9), said fourth transistor (7) being under the control of said third transistor (4) and controlling the current flow through said primary winding (9a) of said ignition coil (9); and h. a diode (36) applying the potential prevailing across said feedback resistor (8) to the emitter (35a) of said second transistor (35).
Claim 3
Dependent Claim
61 words
An ignition system as specified in claim 1 wherein the emitter (30a) and the base (4b) of said first and said third transistor (30,4) are interconnected, wherein the collector (4c) and the base (7b) of said third and fourth transistor (4,7) are interconnected and wherein said feedback resistor (8) is arranged in the collector-emitter current path (7c,7a) of said fourth transistor.
Claim 4
Dependent Claim
80 words
An ignition system as specified in claim 1 wherein a capacitor (33) is interposed in a lead from said first resistor to the base (30b) of said first transistor (30) to turn said fIrst transistor (30) off when said capacitor (33) is fully charged, and wherein a discharge diode (32) is provided to discharge of said capacitor (33) in response to opening of the contacts of said interrupter (1) and interruption of current flow through said first voltage divider (19,40).
Claim 5
Dependent Claim
45 words
An ignition system as specified in claim 1 including a diode (29) interposed in a lead from one of said pair of d-c power supply terminals (17,18) to the end of said first voltage divider remote from the cathode of said Zener diode (40) thereof.
References Cited (Backward Citations)
US3605713A
Cited
US3745985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |