Patent US4252095A successfully refreshed from Google Patents.
US4252095A
Expired / Lapsed
US
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Ignition system for an internal combustion engine
Assignee: MBK Industrie SA
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Filing: 1980-01-30
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Granted: 1981-02-24
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Expires: 2000-01-30
Abstract
Abstract An ignition system for an internal combustion engine, which includes circuitry for producing pulses at a frequency directly related to rotational speed of the engine and a capacitor discharge circuit. A first monostable circuit responsive to the pulses is arranged for triggering the capacitor discharge circuit by passing from its stable state to its unstable state. A second monostable circuit responsive to the pulses is arranged for triggering the capacitor discharge circuit when passing from its unstable state to its stable state. The time constant of the first monostable circuit is substantially equal to the frequency of the ignition system discharge corresponding to the maximum admissible speed of the engine. The time constant of the second monostable circuit being equal to a predetermined value equal to a value of retarded ignition allowing operation of the engine at a reduced power.
Inventors
- 👤 Christian Jaulmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:42
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/155; F02P11/00; F02P11/02; F02P9/00; F02P9/002; F02P9/005; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
In an ignition system for an internal combustion engine, which includes means for producing pulses at a frequency directly related to rotational speed of the engine and capacitor discharge circuit, the improvement comprising a first monostable circuit responsive to said means for producing pulses and arranged for triggering and capacitor discharge circuit by passing from its stable state to its unstable state, and a second monostable circuit responsive to said means for producing pulses and arranged for triggering said capacitor discharge circuit when passing from its unstable state to its stable state, the time constant of said first monostable circuit being substantially equal to the frequency of the ignition system discharge corresponding to the maximum admissible speed of the engine, and the time constant of said second monostable circuit being equal to a predetermined value.
Claim 2
Dependent Claim
135 words
In an ignition system for an internal combustion engine, which includes means for producing pulses at a frequency directly related to rotational speed of the engine and capacitor discharge circuit, the improvement comprising a first monostable circuit responsive to said means for producing pulses and arranged for triggering and capacitor discharge circuit by passing from its stable state to its unstable state, and a second monostable circuit responsive to said means for producing pulses and arranged for triggering said capacitor discharge circuit when passing from its unstable state to its stable state, the time constant of said first monostable circuit being substantially equal to the frequency of the ignition system discharge corresponding to the maximum admissible speed of the engine, and the time constant of said second monostable circuit being equal to a predetermined value.
Claim 3
Dependent Claim
79 words
An improved ignition system according to claim 1, including a shaping circuit coupled between said means for producing pulses and said first and second monostable circuits for supplying from signals delivered thereto voltage pulses of frequency proportional to engine speed and means for directing these voltage pulses to inputs of said two monostable circuits, said time constant of said second monostable circuit being equal to a value of retarded ignition allowing operation of the engine at a reduced power.
Claim 4
Dependent Claim
27 words
An improved ignition system according to either claim 1 or claim 2, wherein an output from each said monostable circuit is applied to said capacitor discharge circuit.
Claim 5
Dependent Claim
30 words
An improved ignition system according to claim 3, including power supply means for supplying power to active circuit components, said power supply means including an ignition coil of the engine.
Claim 6
Dependent Claim
25 words
An improved ignition system according to claim 4, wherein at least said first and said second monostable circuits are constructed as a single tamper-proof block.
Claim 7
Dependent Claim
33 words
An improved ignition system according to claim 1 or claim 2, including power supply means for supplying power to active circuit components, said power supply means including an ignition coil of the engine.
Claim 8
Dependent Claim
27 words
An improved ignition circuit according to claim 1 or claim 2, wherein at least first and said second monostable circuits are constructed as a single tamper-proof block.
References Cited (Backward Citations)
US3153746A
Cited
US3738340A
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US3884203A
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US3985109A
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US4163431A
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US4198933A
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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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |