US4783991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition and combustion engine performance monitor
Assignee: Individual
•
Filing: 1984-06-20
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Granted: 1988-11-15
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Expires: 2004-06-20
Abstract
Abstract A semiautomated diagnostic apparatus primarily used with ignition systems on internal combustion engines is novel in that every firing is examined for peak breakdown voltage level in a synchronized sequential manner to create a display of abnormalities and sequence number identification. Normal conditions can also be displayed in sequence when desired. A variable input permits examining relative peak voltages for further user analysis. An acoustic alert is provided as is an RPM indication and novel realtime indication of spark advance angle. The system operates at any engine speed.
Inventors
- 👤 Glenn H. Wixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:36
CPC Classifications
F; F02; F02P; F02P17/00; F02P17/02; F02P17/04; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
An engine analyzer comprising: means for producing accurately scaled ignition signals from the high voltage ignition source; means for producing signals representing crankshaft top dead center piston positions; means for providing reference sparkplug signals; individual comparator means responsive to said high voltage ignition source signals, said position signals and said plug signals for producing comparator output signals; means responsive to said comparator signals for indicating abnormal ignition operation.
Claim 2
Dependent Claim
68 words
An engine analyzer comprising: means for producing accurately scaled ignition signals from the high voltage ignition source; means for producing signals representing crankshaft top dead center piston positions; means for providing reference sparkplug signals; individual comparator means responsive to said high voltage ignition source signals, said position signals and said plug signals for producing comparator output signals; means responsive to said comparator signals for indicating abnormal ignition operation.
Claim 3
Dependent Claim
18 words
The device of claim 1, further comprising: means for indicating the spark advance angle for every ignition event.
Claim 4
Dependent Claim
13 words
The device of claim 1, further comprising: means for indicating individual sparkplug malfuncitons.
References Cited (Backward Citations)
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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) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |