US3767972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed responsive systems
Assignee: Associated Engineering Ltd
•
Filing: 1972-03-21
•
Granted: 1973-10-23
•
Expires: 1992-03-21
Abstract
Abstract This invention relates to a speed responsive system for a motor vehicle whereby the vehicle may be kept at a predetermined speed, or the driver may be warned when a predetermined speed is reached. In one embodiment, the system includes an inductive pick-up or transducer, which senses rotation of a ferrous-toothed disc rotatable with a shaft to generate a voltage dependent upon the rotational speed of the shaft. Means, comprising a potential divider or a memory circuit, are provided for generating a reference voltage, and a comparator circuit is provided for comparing the voltages, the comparator being arranged to emit or change its output signal when the speed responsive voltage, or a voltage derived therefrom, reaches the reference voltage.
Inventors
- 👤 J Noddings
- 👤 L Hyde
- 👤 R Borton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:41
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103; B; B60; B60K; B60K31/00; B60K31/06; B60K31/10; B60K31/102; B60K31/105
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
A speed responsive system, including means for generating an electrical voltage which changes with rotational speed of a rotatable member, means for generating a reference voltage, comparator means for comparing the voltages, the comparator means being operable to produce an output signal which changes when the speed responsive voltage reaches the reference voltage, pulse generator circuit means including a time constant feedback loop, connected to the output of the comparator means, operable to form the output signal of the comparator means into substantially constant width pulses of which the average value increases with the difference between the speed responsive voltage and the reference voltage, and of which the frequency increases with the difference between the speed responsive voltage and the reference voltage.
Claim 2
Dependent Claim
122 words
A speed responsive system, including means for generating an electrical voltage which changes with rotational speed of a rotatable member, means for generating a reference voltage, comparator means for comparing the voltages, the comparator means being operable to produce an output signal which changes when the speed responsive voltage reaches the reference voltage, pulse generator circuit means including a time constant feedback loop, connected to the output of the comparator means, operable to form the output signal of the comparator means into substantially constant width pulses of which the average value increases with the difference between the speed responsive voltage and the reference voltage, and of which the frequency increases with the difference between the speed responsive voltage and the reference voltage.
Claim 3
Dependent Claim
87 words
A speed responsive system as claimed in claim 1, including a differentiator circuit connected to the voltage generating means and adapted to produce an output voltage which changes with rate of change of the speed responsive voltage, the output of the differentiator circuit being connected to the comparator means, the comparator means being adapted to add the speed responsive voltage to the rate of change voltage thereby to cause the combined voltage to reach the reference voltage before the speed responsive voltage alone reaches the reference voltage.
Claim 4
Dependent Claim
36 words
A speed responsive system as claimed in claim 4, wherein the differential circuit is adapted to produce a rate of change voltage substantially proportional to the rate of change of the rotational speed of the member.
Claim 5
Dependent Claim
73 words
A speed responsive system as claimed in claim 1, wherein the rotatable member is driven by a prime mover having a driver-operable control member for adjusting the output torque of the prime mover, and the output signal from the comparator is used to prevent the speed of the rotatable member exceeding a pRedetermined speed, irrespective of any movement of the driver-operable control member by the driver tending to increase the rotatable member speed.
Claim 6
Dependent Claim
26 words
A speed responsive system as claimed in claim 1, wherein the voltage generating means is connected to a voltmeter calibrated in terms of rotatable member speed.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |