US3985398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidic antiskid circuit
Assignee: United States Department of the Air Force
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Filing: 1975-04-08
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Granted: 1976-10-12
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Expires: 1995-04-08
Abstract
Abstract A pneumatic wheel speed sensor provides pulse frequency signal proportional to wheel speed, the signal is converted to DC signal and differentiated and compared to commanded deceleration, error which causes modulation of brake pressure. Excessive deceleration causes a digital amplifier to switch into the system an integrator resulting in rapid brake pressure signal decrease. A second order lead protects against undesirable landing gear oscillation in aircraft applications.
Inventors
- 👤 Henrik H. Straub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:22
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/321; B60T8/325; G; G01; G01P; G01P15/00; G01P15/02; G01P15/03; G01P15/038; G01P3/00; G01P3/26; G01P3/263; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2065; Y10T137/2071
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A fluidic antiskid circuit comprising: a pneumatic wheel speed sensor connected to a wheel; means for determining the rate of deceleration of the wheel; means for comparing the rate of deceleration with a preselected rate of deceleration, and producing an output signal; valve means connected to a wheel braking system and adapted to receive said output signal whereby braking pressure is varied according to the deceleration rate, and means for detecting and compensating for excessive wheel deceleration, including a fluidic digital amplifier connected to said means for comparing deceleration rates.
Claim 2
Dependent Claim
90 words
A fluidic antiskid circuit comprising: a pneumatic wheel speed sensor connected to a wheel; means for determining the rate of deceleration of the wheel; means for comparing the rate of deceleration with a preselected rate of deceleration, and producing an output signal; valve means connected to a wheel braking system and adapted to receive said output signal whereby braking pressure is varied according to the deceleration rate, and means for detecting and compensating for excessive wheel deceleration, including a fluidic digital amplifier connected to said means for comparing deceleration rates.
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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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |