US3677609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive control for fluid pressure braking system
Assignee: Bendix Corp
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Filing: 1970-09-25
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Granted: 1972-07-18
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Expires: 1990-09-25
Abstract
Abstract An adaptive fluid pressure braking system responsive to wheel deceleration and acceleration for cyclicly decreasing and increasing braking effort at optimum levels to prevent wheel lock-up and provide maximum deceleration. The system includes band control apparatus responsive to a pair of pre-selected wheel acceleration levels whereby, instead of taking corrective action as soon as sensed, whenever wheel acceleration during a preceding cycle is less than the lower level or greater than the upper level, a signal is generated whereby corrective action is taken during the next cycle. Where maximum wheel acceleration falls between the pre-selected levels no corrective action signal is generated for the next cycle. The corrective action may comprise a greater rate of decrease in braking pressure during the next cycle or a lesser rate of decrease in pressure.
Inventors
- 👤 Dennis J Davis
- 👤 Dennis J Sudnick
- 👤 John E Juhasz
- 👤 Sham Kurichh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:40
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/50; B60T8/5018; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; B60T8/1763; B60T8/17633; B60T8/5081; B60T8/58; Y; Y10; Y10S; Y10S188/00; Y10S188/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
175 words
An adaptive braking system for a fluid pressure actuated brake, said system including operator controlled brake valve means for applying and releasing the brakes, means for controlling the brakes during a brake application independently of the operator in response to an impending wheel skid, said means being constructed and arranged to relieve fluid pressure when said vehicle wheel decelerates to a pre-determined level greater than that at which the wheel will lock, said last named means including adjustable means for varying the rate at which the fluid pressure is relieved, means for terminating the relief of fluid pressure at a pre-determined level of acceleration of said wheel and subsequently increasing the fluid pressure at a controlled rate, means responsive to the continued acceleration of said wheel after the termination of said pressure relief for generating a signal representative of a selected level of continued acceleration of said wheel, and means for controlling said adjustable relieving means by said signal to adjust the rate of pressure relief upon the subsequent operation of said pressure relieving means.
Claim 2
Dependent Claim
175 words
An adaptive braking system for a fluid pressure actuated brake, said system including operator controlled brake valve means for applying and releasing the brakes, means for controlling the brakes during a brake application independently of the operator in response to an impending wheel skid, said means being constructed and arranged to relieve fluid pressure when said vehicle wheel decelerates to a pre-determined level greater than that at which the wheel will lock, said last named means including adjustable means for varying the rate at which the fluid pressure is relieved, means for terminating the relief of fluid pressure at a pre-determined level of acceleration of said wheel and subsequently increasing the fluid pressure at a controlled rate, means responsive to the continued acceleration of said wheel after the termination of said pressure relief for generating a signal representative of a selected level of continued acceleration of said wheel, and means for controlling said adjustable relieving means by said signal to adjust the rate of pressure relief upon the subsequent operation of said pressure relieving means.
Claim 3
Dependent Claim
65 words
The system of claim 1 including means establishing a pre-determined level of wheel acceleration above the pre-determined level at which said pressure relief is terminated, and means responsive to a signal representative of a selected wheel acceleration in excess of said established level for controlling said pressure relieving means to reduce the rate of pressure relief upon the subsequent operation of said pressure relieving means.
Claim 4
Dependent Claim
44 words
The system of claim 2 including means responsive to a signal representative of a selected wheel acceleration less than the established level for controlling said pressure relieving means to increase the rate of pressure relief upon the subsequent operation of said pressure relieving means.
Claim 5
Dependent Claim
71 words
The system of claim 2 including means establishing a second predetermined level of wheel acceleration less than said first established level, and means responsive to a signal representative of a selected wheel acceleration less than said first established level but greater than said second established level for controlling said pressure relieving means so as to repeat the same rate of pressure relief upon the subsequent operation of said pressure relieving means.
Claim 6
Dependent Claim
45 words
The system of claim 4 including means responsive to a signal representative of a selected wheel acceleration less than said second established level for controlling said pressure relieving means to increase the rate of pressure relief upon the subsequent operation of said pressure relieving means.
Claim 7
Dependent Claim
105 words
The system of claim 5 wherein said adjustable pressure relieving means comprises in combination with a fluid pressure actuator including a pressure space having a supply port adapted to be connected to said brake valve means, variable area exhaust port means connected to said actuator, valve means cooperating with said variable area exhaust port means to vary the exhaust area of said exhaust port means, and means for selectively operating said valve means to determine the exhaust area and consequent rate of pressure relief in response to the signal generated by a selected level of wheel acceleration relative to the first and second established levels.
Claim 8
Dependent Claim
90 words
The system of claim 5 wherein said adjustable pressure relieving means comprises in combination with a fluid pressure actuator including a pressure space having a supply port adapted to be connected to a brake control valve, a plurality of exhaust ports connected to said actuator, exhaust valves normally closing said ports, and means for selectively opening one or more of said valves to determine the rate of pressure relief in response to the signal generated by the level of wheel acceleration reached relative to said first and second established levels.
Claim 9
Dependent Claim
13 words
The system of claim 7 wherein the exhaust ports have different cross-sectional areas.
Claim 10
Dependent Claim
100 words
The system of claim 7 including a supply valve for controlling said supply port, means for closing said supply valve in response to deceleration of said wheel to said first predetermined level, said last named means including means for retaining said supply valve closed until the operator releases the brakes, a choke at all times communicating said pressure space with the pressure fluid delivered from the brake valve means to said supply port whereby upon termination of said pressure relief and with said supply valve closed fluid pressure is restored to the actuator through said choke at said controlled rate.
Claim 11
Dependent Claim
50 words
The system of claim 9 including means establishing a third pre-determined level of acceleration greater than said first established level, and means responsive to a selected wheel acceleration in excess of said third level for opening said supply valve whereby pressure is restored to the actuator at a rapid rate.
Claim 12
Dependent Claim
144 words
In a vehicle adaptive braking system for a vehicle having a plurality of wheels and brakes for controlling each of said wheels: means responsive to acceleration and deceleration of a corresponding vehicle wheel for generating a first signal when said wheel decelerates in excess of a predetermined level; a modulator responsive to said first signal for relieving braking pressure communicated to the brake controlling said corresponding vehicle wheel, said modulator including means responsive to a second signal for varying the rate at which braking pressure is relieved; means for terminating said braking pressure relief when said corresponding wheel accelerates past a predetermined level; and means responsive to acceleration of said corresponding wheel after termination of said braking pressure relief to generate said second signal to adjust the rate of braking pressure relief for operation of said modulator upon subsequent generation of said first signal.
Claim 13
Dependent Claim
144 words
In a vehicle adaptive braking system for a vehicle having a plurality of wheels and brakes for controlling each of said wheels: means responsive to acceleration and deceleration of a corresponding vehicle wheel for generating a first signal when said wheel decelerates in excess of a predetermined level; a modulator responsive to said first signal for relieving braking pressure communicated to the brake controlling said corresponding vehicle wheel, said modulator including means responsive to a second signal for varying the rate at which braking pressure is relieved; means for terminating said braking pressure relief when said corresponding wheel accelerates past a predetermined level; and means responsive to acceleration of said corresponding wheel after termination of said braking pressure relief to generate said second signal to adjust the rate of braking pressure relief for operation of said modulator upon subsequent generation of said first signal.
Claim 14
Dependent Claim
48 words
The invention of claim 11: said second signal being generated when said corresponding wheel accelerates past a predetermined acceleration rate; said means for varying the rate at which braking pressure is relieved being responsive to said second signal to reduce the rate at which braking pressure is relieved.
Claim 15
Dependent Claim
50 words
The invention of claim 11: said second signal being generated when said corresponding wheel fails to accelerate past a predetermined acceleration rate; said means for varying the rate at which braking pressure is relieved being responsive to said second signal to increase the rate at which braking pressure is relieved.
Claim 16
Dependent Claim
142 words
The invention of claim 11: said means generating said second signal at a first level when said corresponding wheel fails to accelerate past a first predetermined acceleration rate, generating said second signal at a second level when said corresponding wheel accelerates past a second predetermined acceleration rate higher than said first rate, and generating no second signal when said wheel accelerates past said first predetermined rate but fails to attain said second predetermined rate; said means for varying the rate at which braking pressure is s relieved increasing the rate of braking pressure relief when said second signal is generated at said first level, decreasing the rate of braking pressure relief when said second signal is generated at said second level, and permitting the rate of braking pressure relief to remain substantially constant in the absence of generation of said second signal.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |