US3865092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto ignition system for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1973-07-11
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Granted: 1975-02-11
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Expires: 1993-07-11
Abstract
Abstract To prevent operation of the engine in reverse direction of rotation, an auxiliary winding on the magneto is connected with the pulse source which provides ignition trigger pulses by an unsymmetrical conduction network, including diodes, which prevent application of trigger pulses from the pulse source to a control switch connecting an energy storage capacitor to discharge through the ignition coil, thus providing an ignition pulse, unless both the pulse source and the auxiliary winding provide, simultaneously, instantaneous output voltages of a predetermined polarity which is in direction to trigger the pulse source. Preferably, the auxiliary winding is formed as a tapped portion of the main magneto winding.
Inventors
- 👤 Peter Schmaldienst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:13
CPC Classifications
F; F02; F02P; F02P1/00; F02P1/08; F02P1/086; F02P11/00; F02P11/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
308 words
Magneto ignition system for internal combustion engines having a spark plug, comprising a magneto generator (10) having a main winding (14); an energy storage element (16) supplied by the generator; controlled switching means (18) having a control terminal (18a) to permit application of stored energy in a storage element to the spark plug (19); and a pulse source (20) having one terminal (20b) connected to the control terminal (18b) to trigger the controlled switch (18) into conduction and thus apply stored energy to the spark plug, wherein the improvement comprises an auxiliary winding (14'') on the magneto generator (10); and unsymmetrical conduction means (21, 22) connecting a. the auxiliary winding (14'') of the magneto to the pulse source and b. the pulse source (20) to the control terminal (18a), said unsymmetrical conduction means being logically connected to the auxiliary winding (14'') and to the pulse source (20) to become conductive only if both the pulse source and the auxiliary winding provide, simultaneously, an instantaneous output voltage of predetermined polarity; wherein the auxiliary winding and the unsymmetrical conduction means form a reverse rotation inhibiting circuit comprising a cross connection between one terminal (14b) of the auxiliary winding and one terminal (20a) of the pulse source (20); a connecting diode connecting the other terminal of the auxiliary winding (23) and the other terminal (20b) of the pulse source (20), said diode being poled in conductive direction to transfer generated voltage pulses in said auxiliary winding to the pulse source (20); and a coupling diode (21) poled in conductive direction to connect the other terminal (20b) of the pulse source with the control terminal (18a) of the controlled switching means (18) to provide trigger pulses to the controlled switch only when the voltages from the pulse source and the auxiliary winding are of proper polarity to energize the controlled switching means.
Claim 2
Dependent Claim
308 words
Magneto ignition system for internal combustion engines having a spark plug, comprising a magneto generator (10) having a main winding (14); an energy storage element (16) supplied by the generator; controlled switching means (18) having a control terminal (18a) to permit application of stored energy in a storage element to the spark plug (19); and a pulse source (20) having one terminal (20b) connected to the control terminal (18b) to trigger the controlled switch (18) into conduction and thus apply stored energy to the spark plug, wherein the improvement comprises an auxiliary winding (14'') on the magneto generator (10); and unsymmetrical conduction means (21, 22) connecting a. the auxiliary winding (14'') of the magneto to the pulse source and b. the pulse source (20) to the control terminal (18a), said unsymmetrical conduction means being logically connected to the auxiliary winding (14'') and to the pulse source (20) to become conductive only if both the pulse source and the auxiliary winding provide, simultaneously, an instantaneous output voltage of predetermined polarity; wherein the auxiliary winding and the unsymmetrical conduction means form a reverse rotation inhibiting circuit comprising a cross connection between one terminal (14b) of the auxiliary winding and one terminal (20a) of the pulse source (20); a connecting diode connecting the other terminal of the auxiliary winding (23) and the other terminal (20b) of the pulse source (20), said diode being poled in conductive direction to transfer generated voltage pulses in said auxiliary winding to the pulse source (20); and a coupling diode (21) poled in conductive direction to connect the other terminal (20b) of the pulse source with the control terminal (18a) of the controlled switching means (18) to provide trigger pulses to the controlled switch only when the voltages from the pulse source and the auxiliary winding are of proper polarity to energize the controlled switching means.
Claim 3
Dependent Claim
19 words
System according to claim 1 wherein the cross connection is a connection to chassis of the internal combustion engine.
Claim 4
Dependent Claim
50 words
System according to claim 1 further comprising a bridging diode (25) connected in shunt with the auxiliary winding (14'') of the magneto generator (10) and poled to bypass transfer of voltages from the magneto to the pulse source when there are no counteracting voltages being generated in the pulse source.
Claim 5
Dependent Claim
27 words
System acCording to claim 3 wherein the bridging diode (25) has its anode connected to said cross connection and its cathode connected to the auxiliary winding (23).
Claim 6
Dependent Claim
72 words
System according to claim 1 wherein the auxiliary winding (14'') is a portion of the main winding (14) of the magneto generator (10), the other terminal of said winding (14b) being defined by an end terminal (14b) of the main winding and said one terminal (23) being defined by a tap (23) on the main winding (14), the main winding having a first terminal (14a) connected to the energy storage element (16).
Claim 7
Dependent Claim
14 words
System according to claim 5 wherein the energy storage element comprises a capacitor (16).
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |