US3723964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine condition monitoring apparatus
Assignee: Motorola Solutions Inc
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Filing: 1971-12-17
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Granted: 1973-03-27
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Expires: 1991-12-17
Abstract
Abstract An internal combustion engine having an oil pressure lubricating system is provided with engine condition indicator apparatus to continuously monitor engine oil temperature and oil pressure during engine operation. Ambient temperature and engine oil temperature readings are compared to obtain a corrected temperature reading; engine oil temperature and oil pressure readings are also compared to obtain a corrected pressure reading. The corrected oil temperature and oil pressure signals are then compared to engine speed signals and electrical responses obtained respectively when the signals are of greater magnitude than the engine speed signals. Indicator means are provided to indicate occurrences of these electrical responses.
Inventors
- 👤 M Lace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:37
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/08; F01; F01M; F01M1/00; F01M1/18; F02D; F02D41/00; F02D41/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
In combination with an internal combustion engine having an oil pressure lubricating system, engine condition monitoring apparatus comprising electrical sensing means for engine oil temperature, engine oil pressure, and engine speed, respectively, a comparator circuit means connected to said engine oil pressure and engine temperature sensing means for providing a corrected pressure signal representative of the difference between the signals sensed thereby, level detector circuit means for receiving said engine oil temperature and said corrected pressure signals and further connected to said engine speed sensing means for comparing said engine oil temperature signal and said corrected pressure signal to said engine speed signal, respectively, said level detector circuit means providing first output signals when said engine oil temperature and said corrected pressure signals exceed said engine speed signal, respecTively, and indicator means connected to said level detector circuit means for selectively providing an indication in response to occurrences of said first output signals whereby the condition of the engine is continuously monitored.
Claim 2
Dependent Claim
162 words
In combination with an internal combustion engine having an oil pressure lubricating system, engine condition monitoring apparatus comprising electrical sensing means for engine oil temperature, engine oil pressure, and engine speed, respectively, a comparator circuit means connected to said engine oil pressure and engine temperature sensing means for providing a corrected pressure signal representative of the difference between the signals sensed thereby, level detector circuit means for receiving said engine oil temperature and said corrected pressure signals and further connected to said engine speed sensing means for comparing said engine oil temperature signal and said corrected pressure signal to said engine speed signal, respectively, said level detector circuit means providing first output signals when said engine oil temperature and said corrected pressure signals exceed said engine speed signal, respecTively, and indicator means connected to said level detector circuit means for selectively providing an indication in response to occurrences of said first output signals whereby the condition of the engine is continuously monitored.
Claim 3
Dependent Claim
107 words
The combination of claim 1 wherein said comparator circuit means is a first comparator circuit means, said engine condition monitoring apparatus further includes electrical sensing means for engine ambient temperature, a second comparator circuit means connected to said engine oil temperature and ambient temperature sensing means for providing a corrected temperature signal representative of the difference between the signals sensed thereby, said level detector circuit means is connected to said second comparator circuit means for receiving said corrected temperature signal for comparing said corrected temperature signal to said engine speed signal and providing said first output signal when said corrected temperature signal exceeds said engine speed signal.
Claim 4
Dependent Claim
37 words
The combination of claim 2 wherein said level detector circuit means is an analog-to-digital converter circuit means operable to provide both true and not true logic signals, and said first output signals correspond to true logic signals.
Claim 5
Dependent Claim
106 words
The combination of claim 3 wherein said level detector circuit means comprises first and second circuit means for receiving said corrected temperature and pressure signals, respectively, and comparing the same against said engine speed signals, respectively, said indicator means comprises first temperature indicator means responsive to a true logic signal from said first level detector circuit to provide an indication thereof, first oil indicator means responsive to a true logic signal from said second detector circuit to provide an indication thereof, and second temperature and oil indicator means responsive to true logic signals from said first and second detector circuits, respectively, to provide an indication thereof.
Claim 6
Dependent Claim
51 words
The combination of claim 4 wherein said first temperature indicator means is also responsive to a true logic output signal from said second level detector circuit means to prevent any output from said first temperature indicator means during the presence of true logic output signal from said second detector circuit means.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |