US4163192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition spark zone duration circuit
Assignee: RCA Corp
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Filing: 1978-03-27
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Granted: 1979-07-31
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Expires: 1998-03-27
Abstract
Abstract A circuit for generating a clean square electrical pulse having a duration equal to the spark zone duration in an internal combustion engine includes a comparator connected to produce an output when the signal input thereto, coupled from the primary winding of the ignition coil, exceeds a predetermined high voltage at the reference voltage input of the comparator. A one-shot multivibrator triggered by the initial output of the comparator generates an output continuing beyond the duration of high voltage ringing in the signal from the ignition coil. A "nor" gate receptive to outputs from the comparator and the one-shot produces an output which reduces the reference voltage applied to the comparator to a value below the plateau of the signal from the ignition coil. The "nor" gate provides the desired output spark zone duration pulse.
Inventors
- 👤 Eldon M. Sutphin, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:48
CPC Classifications
F; F02; F02P; F02P17/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
141 words
Means for generating a square electrical pulse having a duration equal to the spark zone duration in an internal combustion engine having an ignition coil, comprising a comparator connected to produce an output when the signal input thereto, coupled from the primary winding of the ignition coil, exceeds a predetermined high voltage at the reference voltage input of the comparator, triggered means responsive to the initial output of the comparator to generate an output continuing beyond the duration of high amplitude ringing in the signal from said ignition coil, feedback means operative during outputs from one or the other or both of the comparator and the triggered means to reduce the reference voltage applied to the comparator to a value below the plateau of the signal from the ignition coil, and means to derive an output pulse from the feedback means.
Claim 2
Dependent Claim
141 words
Means for generating a square electrical pulse having a duration equal to the spark zone duration in an internal combustion engine having an ignition coil, comprising a comparator connected to produce an output when the signal input thereto, coupled from the primary winding of the ignition coil, exceeds a predetermined high voltage at the reference voltage input of the comparator, triggered means responsive to the initial output of the comparator to generate an output continuing beyond the duration of high amplitude ringing in the signal from said ignition coil, feedback means operative during outputs from one or the other or both of the comparator and the triggered means to reduce the reference voltage applied to the comparator to a value below the plateau of the signal from the ignition coil, and means to derive an output pulse from the feedback means.
Claim 3
Dependent Claim
14 words
The combination according to claim 1 wherein said triggered means is a monostable multivibrator.
Claim 4
Dependent Claim
35 words
The combination according to claim 2 wherein said feedback means includes an "or" gate receptive to outputs of the comparator and the multivibrator, and said output pulse is derived from the output of "or" gate.
Claim 5
Dependent Claim
104 words
Means for generating an electrical pulse having a duration equal to the spark zone duration in an internal combustion engine, comprising a comparator having a signal input coupled to the primary winding of the ignition coil of the engine, and having a reference signal input, a monostable multivibrator having a trigger input coupled to the output of the comparator, and an "or" gate coupling the output of the comparator and the output of the multivibrator to the reference signal input of the comparator, whereby the output of said "or" gate is a clean square pulse having a duration equal to the spark zone duration.
Claim 6
Dependent Claim
104 words
Means for generating an electrical pulse having a duration equal to the spark zone duration in an internal combustion engine, comprising a comparator having a signal input coupled to the primary winding of the ignition coil of the engine, and having a reference signal input, a monostable multivibrator having a trigger input coupled to the output of the comparator, and an "or" gate coupling the output of the comparator and the output of the multivibrator to the reference signal input of the comparator, whereby the output of said "or" gate is a clean square pulse having a duration equal to the spark zone duration.
Claim 7
Dependent Claim
51 words
In combination, a comparator having a signal input, a reference input, and an output, a monostable multivibrator having a trigger input coupled to the output of the comparator, and an "or" gate coupling the output of the comparator and the output of the multivibrator to the reference input of the comparator.
Claim 8
Dependent Claim
51 words
In combination, a comparator having a signal input, a reference input, and an output, a monostable multivibrator having a trigger input coupled to the output of the comparator, and an "or" gate coupling the output of the comparator and the output of the multivibrator to the reference input of the comparator.
Claim 9
Dependent Claim
107 words
For use with an ignition coil, the combination of a comparator having two input terminals and an output terminal; means for applying to one of the input terminals a control voltage at a reference level; means for applying to the other of the input terminals a wave from the ignition coil; triggered means responsive to a signal at the output terminal of the comparator and having an output, feedback means coupled to the comparator and to the triggered means and supplying feedback to said one input terminal of the comparator for modifying the threshold of the comparator, and means to derive an output from the feedback means.
Claim 10
Dependent Claim
107 words
For use with an ignition coil, the combination of a comparator having two input terminals and an output terminal; means for applying to one of the input terminals a control voltage at a reference level; means for applying to the other of the input terminals a wave from the ignition coil; triggered means responsive to a signal at the output terminal of the comparator and having an output, feedback means coupled to the comparator and to the triggered means and supplying feedback to said one input terminal of the comparator for modifying the threshold of the comparator, and means to derive an output from the feedback means.
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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) | 1982-07-30 | 1983-01-29 | 1983-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-30 | 1987-01-29 | 1987-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-30 | 1991-01-29 | 1991-07-31 | $7700.00 | Window Closed / Lapsed |