Patent US3746402A successfully refreshed from Google Patents.
US3746402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulator for adaptive braking system
Assignee: Bendix Corp
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Filing: 1972-06-29
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Granted: 1973-07-17
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Expires: 1992-06-29
Abstract
Abstract An adaptive braking system is disclosed which includes the usual modulator operated by a fluid motor which is responsive to an output signal from an electronic control unit to relieve braking pressure in the vehicle''s brakes. The system further includes a valve which is responsive to the fluid pressure level actuating the vehicle''s brakes to vary the rate at which the braking pressure communicated to the vehicle''s brakes is relieved by controlling the rate at which fluid pressure is communicated to the fluid motor which operates the modulator. This feature provides a relatively low decay rate when the braking pressure communicated to the brake of the vehicle at the time the modulator is actuated is high, and a much faster decay rate when the pressure level communicated to the brakes of the vehicle upon actuation of the modulator is relatively low. Since relatively high fluid pressures will have been communicated to the vehicle''s brakes upon actuation of the modulator when the vehicle is traversing a surface having a relatively high coefficient of friction, and much lower fluid pressure levels will be communicated to the vehicle''s brakes at the time the modulator is actuated when the vehicle is traversing low coefficient surfaces, the adaptive braking system disclosed herein will provide a high decay rate on low coefficient surfaces and a much lower decay rate on high coefficient surfaces.
Inventors
- 👤 G Hickner
- 👤 R Hendrickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:47
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/50; B60T8/5087; B60T8/5093; B60T8/42; B60T8/4208; B60T8/4225; B60T8/4241; B60T8/425
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
99 words
In a vehicle having a wheel and a brake controlling said wheel, an adaptive braking system comprising: brake pressure developing means for generating braking pressure for actuating said brake; controller means responsive to an incipient skidding condition of said wheel and generating an output signal in response to said incipient skidding condition; modulating means responsive to said output signal for effecting a reduction in the braking pressure communicated to said brake; and means responsive to the magnitude of the braking pressure actuating said brake to control the rate at which the braking pressure communicated to said brake is reduced.
Claim 2
Dependent Claim
99 words
In a vehicle having a wheel and a brake controlling said wheel, an adaptive braking system comprising: brake pressure developing means for generating braking pressure for actuating said brake; controller means responsive to an incipient skidding condition of said wheel and generating an output signal in response to said incipient skidding condition; modulating means responsive to said output signal for effecting a reduction in the braking pressure communicated to said brake; and means responsive to the magnitude of the braking pressure actuating said brake to control the rate at which the braking pressure communicated to said brake is reduced.
Claim 3
Dependent Claim
28 words
The invention of claim 1: said last-mentioned means permitting said braking pressure to reduce at a progressively slower rate as the braking pressure actuating said brake is increased.
Claim 4
Dependent Claim
167 words
In a vehicle having a wheel and a brake controlling said wheel, an adaptive braking system comprising: brake pressure developing means for generating braking pressure for actuating said brake; controlling means responsive to an incipient skidding condition of said wheel and generating an output signal in response to said incipient skidding condition; modulating means responsive to said output signal for effecting a reduction in the braking pressure communicated to said brake; said modulating including a housing defining a compartment therewithin communicated to said brake pressure developing means and to said brake, a plunger slidably mounted in said compartment and movable to effect a change in volume of the latter, pressure differential responsive means operably connected to said plunger for moving the latter, and means responsive to said output signal for communicating a pressure differential across said pressure differential responsive means; and means responsive to the pressure level actuating said brake for controlling the rate at which said pressure differential is communicated across said pressure differential responsive means.
Claim 5
Dependent Claim
167 words
In a vehicle having a wheel and a brake controlling said wheel, an adaptive braking system comprising: brake pressure developing means for generating braking pressure for actuating said brake; controlling means responsive to an incipient skidding condition of said wheel and generating an output signal in response to said incipient skidding condition; modulating means responsive to said output signal for effecting a reduction in the braking pressure communicated to said brake; said modulating including a housing defining a compartment therewithin communicated to said brake pressure developing means and to said brake, a plunger slidably mounted in said compartment and movable to effect a change in volume of the latter, pressure differential responsive means operably connected to said plunger for moving the latter, and means responsive to said output signal for communicating a pressure differential across said pressure differential responsive means; and means responsive to the pressure level actuating said brake for controlling the rate at which said pressure differential is communicated across said pressure differential responsive means.
Claim 6
Dependent Claim
32 words
The invention of claim 3: said last-mentioned means decreasing the rate at which said pressure differential is communicated across said pressure differential responsive rate as the pressure actuating said brake is increased.
Claim 7
Dependent Claim
81 words
The invention of claim 3: said pressure differential responsive means including a first piston slidably mounted within said housing, said means responsive to said output signal communicating a higher fluid pressure level to one side of said first piston than the fluid pressure level communicated to the other side of the latter; said means responsive to the pressure level actuating said brake controlling the rate at which fluid pressure is communicated to said one side of said pressure differential responsive means.
Claim 8
Dependent Claim
39 words
The invention of claim 5: said last-mentioned means decreasing the rate at which fluid pressure is communicated to said one side of said first piston as the pressure actuating said brake when said output signal is generated, is increased.
Claim 9
Dependent Claim
114 words
The invention of claim 3: said modulating means including a housing defining a chamber therewithin, said pressure differential responsive means including a first piston slidably mounted in said chamber and defining a pair of fluid receiving cavities between opposite sides of the piston and corresponding ends of the housing, and passage means communicating one of said chambers with a fluid pressure level greater than that normally existing in said chambers, said means responsive to said output signal including electrically operated valve means controlling fluid communication through said passage means; said means responsive to the pressure level actuating said brake being constructed and arranged to control the rate of fluid flow through said passage means.
Claim 10
Dependent Claim
28 words
The invention of claim 7: said last-mentioned means beinG effective to vary the cross-sectional area of said passage means in response to the braking pressure actuating said brake.
Claim 11
Dependent Claim
36 words
The invention of claim 7: each of said fluid receiving cavities being normally communicated to a vacuum source, said passage means communicating said one cavity with atmospheric pressure when said electrically operated valve means is opened.
Claim 12
Dependent Claim
51 words
The invention of claim 7: said last-mentioned means including a section piston responsive to the braking pressure actuating said brake, said second piston controlling the rate of flow of fluid through said passage means, and resilient means yieldably urging said second piston to a position permitting unrestricted flow through passage means.
Claim 13
Dependent Claim
57 words
The invention of claim 7: said last-mentioned means including a second piston responsive to the braking pressure actuating said brake, said second piston varying the cross-sectional flow area of said passage means in accordance with the pressure level actuating said brake, and resilient means yieldably urging said second piston to permitting unrestricted flow through said passage means.
Claim 14
Dependent Claim
19 words
The invention of claim 11: said second piston decreasing said cross-sectional flow area as the braking pressure is increased.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |