US3776606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency to voltage converter employing hall effect cell with signal hysteresis and normalizing
Assignee: GTE Sylvania Inc
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Filing: 1972-06-13
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Granted: 1973-12-04
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Expires: 1992-06-13
Abstract
Abstract Frequency to voltage converter apparatus suitable for use in wheeled vehicle anti-skid devices includes a source of magnetic flux varying between upper and lower levels at a rate representative of vehicle wheel speed with a Hall effect cell device responsive to the rate of upper and lower flux variation to provide varying electrical signals which are applied by electrical circuitry to a braking system for effecting control of the wheel speed.
Inventors
- 👤 L Emerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:32
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/172
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
In a braking system for a wheeled vehicle, a frequency to voltage converter comprising: magnetic flux means providing magnetic flux varying between upper and lower flux levels at a rate representative of the rotational speed of a wheel; Hall effect cell means coupled to said magnetic flux means and providing electrical signals representative of said rate of upper and lower levels of magnetic flux variation; and electrical circuit means coupled to said Hall effect cell means for applying said electrical signals to a braking system of a wheeled vehicle, said electrical circuit means including a series connecting switching means, hysteresis means having a first threshold level for ''''turn-on'''' and decoupling and a second threshold level for ''''turn-off'''' and coupling, and a normalizing means for providing uniform pulse potential output signals.
Claim 2
Dependent Claim
130 words
In a braking system for a wheeled vehicle, a frequency to voltage converter comprising: magnetic flux means providing magnetic flux varying between upper and lower flux levels at a rate representative of the rotational speed of a wheel; Hall effect cell means coupled to said magnetic flux means and providing electrical signals representative of said rate of upper and lower levels of magnetic flux variation; and electrical circuit means coupled to said Hall effect cell means for applying said electrical signals to a braking system of a wheeled vehicle, said electrical circuit means including a series connecting switching means, hysteresis means having a first threshold level for ''''turn-on'''' and decoupling and a second threshold level for ''''turn-off'''' and coupling, and a normalizing means for providing uniform pulse potential output signals.
Claim 3
Dependent Claim
43 words
The frequency to voltage converter of claim 1 including a filtering means coupling said normalizing means to said braking system whereby relatively small magnitude variations of an electrical signal from said waveform normalizing means are filtered and not applied to said braking system.
Claim 4
Dependent Claim
87 words
A frequency to voltage converter suitablE for use with a wheeled vehicle braking system comprising: means for developing upper and lower magnetic flux levels varying at a rate substantially proportional to the rotational speed of a wheel; Hall effect cell means responsive to said varying rate of magnetic flux for providing a varying rate of electrical signals; and switching means, hysteresis signal means, waveform normalizing means, and filtering means series coupling electrical signals from said Hall effect cell means to a braking system of a wheeled vehicle.
Claim 5
Dependent Claim
87 words
A frequency to voltage converter suitablE for use with a wheeled vehicle braking system comprising: means for developing upper and lower magnetic flux levels varying at a rate substantially proportional to the rotational speed of a wheel; Hall effect cell means responsive to said varying rate of magnetic flux for providing a varying rate of electrical signals; and switching means, hysteresis signal means, waveform normalizing means, and filtering means series coupling electrical signals from said Hall effect cell means to a braking system of a wheeled vehicle.
Claim 6
Dependent Claim
27 words
The frequency to voltage converter of claim 3 wherein said switching means includes first, second, and third series connected transistors coupled to said Hall effect cell means.
Claim 7
Dependent Claim
53 words
The frequency to voltage converter of claim 3 wherein said first transistor of said switching means is conductive at a first level of magnetic flux and said second and third transistors are non-conductive while said first transistor is non-conductive and said second and third transistors conductive at a second level of magnetic flux.
Claim 8
Dependent Claim
16 words
The frequency to voltage converter of claim 3 wherein said circuitry is adapted to monolithic configuration.
References Cited (Backward Citations)
US3317829A
Cited
US3195043A
Cited
US3606490A
Cited
US3597011A
Cited
US3642329A
Cited
US3596114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |