US3603878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed-monitor system and method using impulsive ignition noise
Assignee: Individual
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Filing: 1969-02-25
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Granted: 1971-09-07
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Expires: 1989-02-25
Abstract
Abstract A speed monitor system using impulsive ignition noise in the form of a periodic sequence of noise bursts which is present on the power distribution buss of a motor vehicle. The noise burst are amplified and a pulse is produced for each noise burst to develop a sequence of pulses. An output signal is generated proportional to the time rate of the sequence of pulses and is therefore proportional to the engine speed.
Inventors
- 👤 Joseph M Himmelstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:12
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
In an internal combustion engine motor vehicle having a power distribution buss which develops impulsive ignition noise in the form of a periodic sequence of noise bursts a speed monitor system which comprises amplifier means connected to said buss for amplifying said noise bursts, pulse means for producing an individual pulse for each noise burst to provide a sequence of pulses, means for generating an output signal proportional to the frequency of said pulses and thereby proportional to said engine speed, monitor means for producing an alarm indication when said output signal is equal to or greater in value than a threshold value, means for selectively varying the threshold value to obtain an alarm indication when said engine speed is at a predetermined value, means for decreasing said output signal by a preselected percentage of its value whereby said alarm indication is produced only when said engine speed exceeds the threshold by said preselected percentage, and means for temporarily short circuiting said decreasing means during the time said selectively varying means is adjusted.
Claim 2
Dependent Claim
173 words
In an internal combustion engine motor vehicle having a power distribution buss which develops impulsive ignition noise in the form of a periodic sequence of noise bursts a speed monitor system which comprises amplifier means connected to said buss for amplifying said noise bursts, pulse means for producing an individual pulse for each noise burst to provide a sequence of pulses, means for generating an output signal proportional to the frequency of said pulses and thereby proportional to said engine speed, monitor means for producing an alarm indication when said output signal is equal to or greater in value than a threshold value, means for selectively varying the threshold value to obtain an alarm indication when said engine speed is at a predetermined value, means for decreasing said output signal by a preselected percentage of its value whereby said alarm indication is produced only when said engine speed exceeds the threshold by said preselected percentage, and means for temporarily short circuiting said decreasing means during the time said selectively varying means is adjusted.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |