US3847448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for antiskid control of a hydraulic brake system
Assignee: Sharp Corp
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Filing: 1972-10-10
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Granted: 1974-11-12
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Expires: 1992-10-10
Abstract
Abstract An anti-skid brake control system for hydraulically braked vehicle wheels senses and regulates the deceleration of one of the braked wheels and uses the mean speed of this wheel to compare with the sensed speed of another wheel whose braking is controlled to conform to the first wheel. Preferably the first wheel is selected as most likely to skid, and the other wheel is one having superior braking ability.
Inventors
- 👤 K Nishida
- 👤 T Okamoto
- 👤 M Inada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:53
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/58; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
278 words
An apparatus for the antiskid brake control of a plurality of front and rear wheels of a powered and wheeled vehicle, comprising means for sensing the revolutions per unit time of each of said wheels and for issuing output signals responsive to the sensed wheel revolutions, and an actuator for regulating the respective wheel brake pressure in response to said output signals, said apparatus further comprising in combination: a. a first means for delivery of an electrical voltage in response to the said output signal corresponding to the revolutions of one of the wheels, for providing a wheel decelerating signal thereof; b. a second means for generating a brake pressure control signal for effecting a pressure control action at the brake means for said one wheel, when said wheel deceleration signal exceeds a predetermined value; c. a third means comprising a capacitor for accumulation of an output signal corresponding to the revolutions of a pair of wheels, and a discharge circuit for discharging the charge accumulated in said capacitor in response to the acceleration of said one wheel when said brake means for said one wheel is released, thereby establishing a pseudo vehicle speed signal; d. a fourth means for generating a voltage in response to said output signal from a remaining one of said wheels, thereby providing a wheel speed signal for said remaining wheel; e. a fifth means for obtaining a comparison signal upon comparing said remaining wheel speed signal with said pseudo vehicle speed signal; and f. a sixth means for generation of a brake pressure control signal responsive to said comparison signal for control of the brake pressure applied to said remaining vehicle wheel.
Claim 2
Independent Claim
278 words
An apparatus for the antiskid brake control of a plurality of front and rear wheels of a powered and wheeled vehicle, comprising means for sensing the revolutions per unit time of each of said wheels and for issuing output signals responsive to the sensed wheel revolutions, and an actuator for regulating the respective wheel brake pressure in response to said output signals, said apparatus further comprising in combination: a. a first means for delivery of an electrical voltage in response to the said output signal corresponding to the revolutions of one of the wheels, for providing a wheel decelerating signal thereof; b. a second means for generating a brake pressure control signal for effecting a pressure control action at the brake means for said one wheel, when said wheel deceleration signal exceeds a predetermined value; c. a third means comprising a capacitor for accumulation of an output signal corresponding to the revolutions of a pair of wheels, and a discharge circuit for discharging the charge accumulated in said capacitor in response to the acceleration of said one wheel when said brake means for said one wheel is released, thereby establishing a pseudo vehicle speed signal; d. a fourth means for generating a voltage in response to said output signal from a remaining one of said wheels, thereby providing a wheel speed signal for said remaining wheel; e. a fifth means for obtaining a comparison signal upon comparing said remaining wheel speed signal with said pseudo vehicle speed signal; and f. a sixth means for generation of a brake pressure control signal responsive to said comparison signal for control of the brake pressure applied to said remaining vehicle wheel.
Claim 3
Dependent Claim
34 words
The apparatus as claimed in claim 1 wherein said fourth means includes a comparison circuit arranged to provide said remaining wheel speed signal as a maximum value determined by comparing various other wheel speeds.
Claim 4
Dependent Claim
30 words
The apparatus as claimed in claim 1 wherein said fifth means is connected with a limiting circuit to deliver an output signal when said comparison signal attains a predetermined value.
Claim 5
Dependent Claim
36 words
The apparatus as claimed in claim 1 wherein said third and fourth means are adapted for determination of respective time constants, the time constant of said third means being larger than that of said fourth means.
Claim 6
Dependent Claim
23 words
The apparatus as claimed in claim 4 wherein said comparison signal produced by said fifth means is responsive to said respective time constants.
Claim 7
Dependent Claim
27 words
The apparatus as claimed in claim 3 wherein said fifth means is adapted for providing a ratio between said remaining wheel speed and said pseudo vehicle speed.
Claim 8
Dependent Claim
36 words
The apparatus as claimed in claim 6 wherein said fifth means is adapted for delivery of an output signal when said remaining wheel''s rotational speed drops to less than 20 percent of said pseudo vehicle speed.
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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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |