US3608982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the control of antiskid brake pressure
Assignee: Aisin Corp
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Filing: 1969-06-12
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Granted: 1971-09-28
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Expires: 1989-06-12
Abstract
Abstract In a pneumatically servo-controlled hydraulic brake pressure control arrangement, comprising a pneumatic servo unit having two pneumatic piston chambers; a master cylinder unit operatively connected with said servo unit, on the one hand, and with hydraulic cylinder means for wheel or wheels of a powered vehicle, on the other; an air change off valve means adapted for receiving a wheel lock or lock-impending a signal from a wheel deceleration sensing means, the improvements comprise the provision of a check valve adapted for on-off controlling pneumatic flow from one of said servo piston chambers through said change off valve means, and a flow control valve adapted for throttling said flow, said check valve and said flow control valve being arranged in parallel to each other for suppressing otherwise possible excess repetition of hydraulic brake pressure increase and release in case of an abrupt and considerable application of the hydraulic braking effort.
Inventors
- 👤 Masami Inada
- 👤 Tasuo Hayashi
- 👤 Katuki Takayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/66; B60T13/72; B60T8/00; B60T8/32; B60T8/34; B60T8/44; B60T8/447; B60T8/448; B60T8/50; B60T8/5018; B60T8/5025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
An antiskid braking control system for a vehicle having wheel cylinders and a master cylinder fluidically connected thereto for applying hydraulic brake pressure to said wheel cylinders for braking the wheels of said vehicle comprising, servo means having two pneumatic chambers separated by a power piston for boosting hydraulic brake pressure in said master cylinder, sensing means producing a first signal when said vehicle wheels are locked and a second signal when said wheels are released, control means responsive to said sensing means for controlling said servo means and including valve means operable to control the pressUre differential in said chambers so as to move said power piston in a direction in which hydraulic pressure is decreased in response to said first signal and to move said power piston in a direction in which hydraulic brake pressure is increased in response to said second signal, and pressure control means adapted to permit a rapid decrease of pressure in one of said chambers upon reception of said second signal to allow a rapid increase in brake pressure until a predetermined pressure differential in said chambers is achieved and subsequently permitting a further gradual decrease in pressure to allow a gradual increase in brake pressure upon reapplication of said brakes.
Claim 2
Dependent Claim
208 words
An antiskid braking control system for a vehicle having wheel cylinders and a master cylinder fluidically connected thereto for applying hydraulic brake pressure to said wheel cylinders for braking the wheels of said vehicle comprising, servo means having two pneumatic chambers separated by a power piston for boosting hydraulic brake pressure in said master cylinder, sensing means producing a first signal when said vehicle wheels are locked and a second signal when said wheels are released, control means responsive to said sensing means for controlling said servo means and including valve means operable to control the pressUre differential in said chambers so as to move said power piston in a direction in which hydraulic pressure is decreased in response to said first signal and to move said power piston in a direction in which hydraulic brake pressure is increased in response to said second signal, and pressure control means adapted to permit a rapid decrease of pressure in one of said chambers upon reception of said second signal to allow a rapid increase in brake pressure until a predetermined pressure differential in said chambers is achieved and subsequently permitting a further gradual decrease in pressure to allow a gradual increase in brake pressure upon reapplication of said brakes.
Claim 3
Dependent Claim
86 words
An antiskid braking control system as set forth in claim 1 wherein said valve means comprises, a vacuum valve for connecting the other of said chambers with a vacuum source responsive to said first signal and for connecting said pressure control means with said vacuum source responsive to said second signal, and an air valve for connecting said pressure control means with an atmospheric pressure source responsive to said first signal and connecting said servo means with said atmospheric pressure source responsive to said second signal.
Claim 4
Dependent Claim
93 words
An antiskid braking control system as set forth in claim 1 wherein said servo means further comprises passage means connected between said two chambers for establishing pneumatic communication therebetween, valve means responsive to foot pressure exerted upon a brake pedal for on-off control of said passage means and for movement of said power piston, spring means for urging said power piston in opposition to said foot pressure and passage mans for connecting one of said two chambers with said pressure control means and connecting the other of said chambers with said control means.
Claim 5
Dependent Claim
42 words
An antiskid braking control system as set forth in claim 3 wherein said pressure control means comprises a check valve for checking pneumatic flow from said one chamber to said control means and a flow control valve for controlling said pneumatic flow.
Claim 6
Dependent Claim
35 words
An antiskid braking control system as set forth in claim 4 wherein said check valve and said flow control valve are arranged in parallel to each other between said one chamber and said control means.
Claim 7
Dependent Claim
53 words
An antiskid braking control system as set forth in claim 4 wherein said flow control valve comprises a valve member adapted for on-off control of fluid communication between said one chamber and said control means, a spring urging said valve member towards its closed position, and an orifice provided in said valve member.
Claim 8
Dependent Claim
196 words
An antiskid braking control system as set forth in claim 1 wherein said servo means further comprises passage means connected between said two chambers for establishing pneumatic communication therebetween, valve means responsive to foot pressure exerted upon a brake pedal for on-off control of said passage means and for moving said power piston, spring means for urging said power piston in opposition to said foot pressure, and passage means for connecting one of said two chambers with said pressure control means and connecting the other chamber with said control means, said valve means further comprising a vacuum valve for connecting the other of said chambers with a vacuum source responsive to said first signal and for connecting said pressure control means with said vacuum source responsive to said second signal, and an air valve for connecting said pressure control means with an atmospheric pressure source responsive to said first signal and connecting said servo means with said atmospheric pressure source responsive to said second signal, and wherein said pressure control means comprises a check valve for checking pneumatic flow from one chamber to said control means and a flow control valve for controlling said pneumatic flow.
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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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |