US3743362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake control system
Assignee: Boeing North American Inc
•
Filing: 1972-01-03
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Granted: 1973-07-03
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Expires: 1992-01-03
Abstract
Abstract An antiwheel-lock brake control system in which, following the detection of incipient wheel lock, brake apply pressure is initially relieved and thereafter controlled by cyclical time duration modulation of an operator-initiated brake apply pressure.
Inventors
- 👤 J Neisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:21
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
210 words
A method of operating an antiwheel-lock braking system of the type which includes a vehicle operator-controlled fluid control pressure generator, a brake actuating fluid pressure source, a fluid pressure-responsive brake actuator, a main valve connected to said fluid pressure source and having a discharge passage from which brake actuating pressure is supplied to said brake actuator, and a control device responsive to the control pressure from said generator and operatively connected to said main valve for controlling the application of brake actuating pressure to said brake actuator, the method comprising the steps of actuating the generator to actuate the fluid pressure control device to cause said main valve to apply brake actuating pressure to the brake actuator, operating said fluid pressure control device to rapidly, termporarily relieve the brake actuating pressure applied to the brake actuator and temporarily terminating connection of the generator output pressure to said fluid pressure control device independently of said pressure generator, cycylically reconnecting and disconnecting said fluid pressure control device to and from the generator output pressure, whereby a desired magnitude of fluid pressure is established at the brake actuator by varying the relative magnitude of the durations of the connection and disconnection of the fluid pressure control device and the generator during successive cycles.
Claim 2
Independent Claim
210 words
A method of operating an antiwheel-lock braking system of the type which includes a vehicle operator-controlled fluid control pressure generator, a brake actuating fluid pressure source, a fluid pressure-responsive brake actuator, a main valve connected to said fluid pressure source and having a discharge passage from which brake actuating pressure is supplied to said brake actuator, and a control device responsive to the control pressure from said generator and operatively connected to said main valve for controlling the application of brake actuating pressure to said brake actuator, the method comprising the steps of actuating the generator to actuate the fluid pressure control device to cause said main valve to apply brake actuating pressure to the brake actuator, operating said fluid pressure control device to rapidly, termporarily relieve the brake actuating pressure applied to the brake actuator and temporarily terminating connection of the generator output pressure to said fluid pressure control device independently of said pressure generator, cycylically reconnecting and disconnecting said fluid pressure control device to and from the generator output pressure, whereby a desired magnitude of fluid pressure is established at the brake actuator by varying the relative magnitude of the durations of the connection and disconnection of the fluid pressure control device and the generator during successive cycles.
Claim 3
Dependent Claim
37 words
The method defined in claim 1 further comprising the steps of gradually increasing the duration of the connection time relative to the disconnection time to thereby gradually increase the magnitude of fluid pressure at the brake actuator.
Claim 4
Dependent Claim
180 words
An antiwheel-lock braking system comprising: a vehicle operator-controlled fluid control pressure generator, a brake actuating fluid pressure source, a fluid pressure-responsive brake actuator, a main valve connected to said fluid pressure source and having a discharge passage from which brake actuating pressure is supplied to said brake actuator, a control device responsive to the control pressure from said generator and operatively connected to said main valve for controlling the application of brake actuating pressure to said brake actuator, means for operating said fluid pressure control device to rapidly, temporarily relieve the brake actuating pressure applied to the brake actuator and temporarily terminating connection of the generator output pressure to said fluid pressure control device independently of the operation of said pressure generator, said operating means including means for cyclically reconnecting and disconnecting said fluid pressure control device to and from the output of said generator, whereby a desired magnitude of fluid pressure is established at the brake actuator by varying the relative magnitude of the durations of the connection and disconnection of the fluid pressure control device and the generator.
Claim 5
Dependent Claim
180 words
An antiwheel-lock braking system comprising: a vehicle operator-controlled fluid control pressure generator, a brake actuating fluid pressure source, a fluid pressure-responsive brake actuator, a main valve connected to said fluid pressure source and having a discharge passage from which brake actuating pressure is supplied to said brake actuator, a control device responsive to the control pressure from said generator and operatively connected to said main valve for controlling the application of brake actuating pressure to said brake actuator, means for operating said fluid pressure control device to rapidly, temporarily relieve the brake actuating pressure applied to the brake actuator and temporarily terminating connection of the generator output pressure to said fluid pressure control device independently of the operation of said pressure generator, said operating means including means for cyclically reconnecting and disconnecting said fluid pressure control device to and from the output of said generator, whereby a desired magnitude of fluid pressure is established at the brake actuator by varying the relative magnitude of the durations of the connection and disconnection of the fluid pressure control device and the generator.
Claim 6
Dependent Claim
47 words
The braking system defined in claim 3, wherein said operating means includes a solenoid actuated valve interposed in a fluid conduit between said control device and said operator-controlled generator, and said solenoid is cyclically energized and deenergized to disconnect and reconnect said control device from said generator.
Claim 7
Dependent Claim
54 words
The system defined in claim 4, wherein said solenoid actuated valve is normally biased mechanically to its open position providing direct fluid communication between said operator-controlled generator and said control device, whereby, in the event of operational failure of said solenoid the system will operate in its normal manner but without its antiwheel-lock function.
References Cited (Backward Citations)
US3503654A
Cited
US3620577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |