Patent US4381500A successfully refreshed from Google Patents.
US3768451A
Expired / Lapsed
US
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Ignition timing control system
Assignee: Denso Corp
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Filing: 1971-06-03
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Granted: 1973-10-30
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Expires: 1991-06-03
Abstract
Abstract An ignition timing control system having a set of ignition times preset to meet the ignition timing requirements of an engine operating under various satisfactory operating conditions, whereby an ignition time which meets the ignition timing requirement of the engine at each time is selected from the said set of ignition times to be applied to the engine according to the engine revolutions, engine intake manifold vacuum, temperature of the engine cooling water and so on.
Inventors
- 👤 H Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:26
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/155; F02P5/1553; F02P5/1556; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
214 words
An ignition timing control system for use with an electric power source and an ignition circuit for internal combustion engine comprising: engine revolution detecting means connected to said electric power source and having a plurality of detectors each of which detects a different preset range of engine revolutions and generates an output signal only when the revolutions fall within the respective preset range; engine intake vacuum detecting means connected to each of the output terminals of said engine revolution detecting means and having a plurality of detectors each of which detects a preset range of engine intake vacuum and generates an output signal only when the vacuum falls within the respective preset range and said detector has an input signal from said engine revolution detecting means; ignition signal generator means having a plurality of generators each of which is for generating a respective ignition signal at a preselected timing periodically; interrupting means having a plurality of interrupters each of which is connected to a respective one of said generators and to a respective output of said engine intake vacuum detecting means and supplies electric power only when said interrupter has an output from said intake manifold vacuum detecting means and interrupts the electric power when said interrupter has said ignition signal as its input.
Claim 2
Dependent Claim
214 words
An ignition timing control system for use with an electric power source and an ignition circuit for internal combustion engine comprising: engine revolution detecting means connected to said electric power source and having a plurality of detectors each of which detects a different preset range of engine revolutions and generates an output signal only when the revolutions fall within the respective preset range; engine intake vacuum detecting means connected to each of the output terminals of said engine revolution detecting means and having a plurality of detectors each of which detects a preset range of engine intake vacuum and generates an output signal only when the vacuum falls within the respective preset range and said detector has an input signal from said engine revolution detecting means; ignition signal generator means having a plurality of generators each of which is for generating a respective ignition signal at a preselected timing periodically; interrupting means having a plurality of interrupters each of which is connected to a respective one of said generators and to a respective output of said engine intake vacuum detecting means and supplies electric power only when said interrupter has an output from said intake manifold vacuum detecting means and interrupts the electric power when said interrupter has said ignition signal as its input.
Claim 3
Dependent Claim
93 words
A system as in claim 1 wherein: said plurality of detectors in said intake vacuum detecting means includes N groups of P detectors, P being greater than N; the said preset range of intake vacuum being different for each of said P detectors in any of said N groups thereof, said plurality of detectors in said revolution detecting means being N in number and being connected respectively to said N groups of P detectors; there being N times P number of said generators for providing their said ignition signals at respectively different times.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |