US4202584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-skid brake control device and associated method
Assignee: Honda Motor Co Ltd
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Filing: 1978-01-20
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Granted: 1980-05-13
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Expires: 1998-01-20
Abstract
Abstract An anti-skid brake control device and associated method in which the device includes a wheel cylinder having defined therein a first hydraulic chamber connected with a brake fluid line extending from the master cylinder and a second hydraulic chamber connected with a pressure controlling fluid circuit. As the brake fluid line is isolated from the pressure controlling circuit by the output member of the wheel cylinder, the brake system can operate effectively, though in a conventional manner, should oil leakage occur in the controlling circuit. On a four-wheeled vehicle, each pair of front or rear wheel cylinders can be served by a common arrangement of such pressure controlling circuit for anti-skid control.
Inventors
- 👤 Makoto Sato
- 👤 Hiroshi Takamatsu
- 👤 Yoshitaka Miyagawa
- 👤 Etsuo Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:37
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/88; B60T8/885; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T8/17; B60T8/1701; B60T8/1708; B60T8/176; B60T8/1761; B60T8/17613; B60T8/34; B60T8/343; B60T8/344; B60T8/348; B60T8/40; B60T8/4004; B60T8/4009; B60T2270/00; B60T2270/40; B60T2270/403
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
280 words
In a brake system for use with wheeled vehicles including a brake fluid pressure producing unit, an anti-skid brake control device comprising: an oil-hydraulic brake mechanism associated with a vehicle wheel and including an operating member, a first hydraulic chamber defined on one side of said operating member for hydraulically driving the latter, and a second hydraulic chamber defined on the opposite side of said operating member to apply thereon an oil-hydraulic pressure counteracting the oil-hydraulic pressure applied to said operating member on said one side thereof, said first hydraulic chamber being held in fluid communication with said brake fluid pressure producing unit; a source of fluid pressure; a high-pressure fluid line extending between said second hydraulic chamber in said brake mechanism and said source of fluid pressure; an oil reservoir; a low-pressure fluid line extending between said second hydraulic chamber in said brake mechanism and said oil reservoir; fluid control valve means inserted in said high-pressure and low-pressure fluid lines; and command system means connected with said fluid control valve means for effecting a repeated braking process in which the braking torque as applied to the wheel begins to decrease when the angular deceleration of the wheel exceeds a predetermined threshold valve, then begins to increase when the angular wheel deceleration decreasing with decrease in the braking torque is reduced below said predetermined threshold value, is subsequently held at a definite level during the period of time that the angular acceleration of the wheel arising upon disappearance of the angular wheel deceleration is held above a predetermined threshold value, and finally begins again to rise when the angular acceleration of the wheel falls below its said predetermined threshold value.
Claim 2
Dependent Claim
280 words
In a brake system for use with wheeled vehicles including a brake fluid pressure producing unit, an anti-skid brake control device comprising: an oil-hydraulic brake mechanism associated with a vehicle wheel and including an operating member, a first hydraulic chamber defined on one side of said operating member for hydraulically driving the latter, and a second hydraulic chamber defined on the opposite side of said operating member to apply thereon an oil-hydraulic pressure counteracting the oil-hydraulic pressure applied to said operating member on said one side thereof, said first hydraulic chamber being held in fluid communication with said brake fluid pressure producing unit; a source of fluid pressure; a high-pressure fluid line extending between said second hydraulic chamber in said brake mechanism and said source of fluid pressure; an oil reservoir; a low-pressure fluid line extending between said second hydraulic chamber in said brake mechanism and said oil reservoir; fluid control valve means inserted in said high-pressure and low-pressure fluid lines; and command system means connected with said fluid control valve means for effecting a repeated braking process in which the braking torque as applied to the wheel begins to decrease when the angular deceleration of the wheel exceeds a predetermined threshold valve, then begins to increase when the angular wheel deceleration decreasing with decrease in the braking torque is reduced below said predetermined threshold value, is subsequently held at a definite level during the period of time that the angular acceleration of the wheel arising upon disappearance of the angular wheel deceleration is held above a predetermined threshold value, and finally begins again to rise when the angular acceleration of the wheel falls below its said predetermined threshold value.
Claim 3
Dependent Claim
130 words
An anti-skid brake control method adapted for use with a wheeled vehicle, said method comprising the steps of: decreasing a braking torque as applied to a wheel when an angular deceleration of said wheel exceeds a first predetermined threshold value; increasing the braking torque when the angular wheel deceleration, decreasing with decrease in the braking torque, is reduced below said first predetermined threshold value; holding the braking torque at a definite level during the period of time in which the angular acceleration of the wheel, increasing upon disappearance of the angular wheel deceleration, remains above a second predetermined threshold value; increasing the braking torque when the angular acceleration of the wheel falls below said second predetermined threshold value; and repeating the above-described sequence of steps until the vehicle is stopped.
Claim 4
Dependent Claim
130 words
An anti-skid brake control method adapted for use with a wheeled vehicle, said method comprising the steps of: decreasing a braking torque as applied to a wheel when an angular deceleration of said wheel exceeds a first predetermined threshold value; increasing the braking torque when the angular wheel deceleration, decreasing with decrease in the braking torque, is reduced below said first predetermined threshold value; holding the braking torque at a definite level during the period of time in which the angular acceleration of the wheel, increasing upon disappearance of the angular wheel deceleration, remains above a second predetermined threshold value; increasing the braking torque when the angular acceleration of the wheel falls below said second predetermined threshold value; and repeating the above-described sequence of steps until the vehicle is stopped.
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) | 1983-05-13 | 1983-11-12 | 1984-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-13 | 1987-11-12 | 1988-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-13 | 1991-11-12 | 1992-05-13 | $7700.00 | Window Closed / Lapsed |