US3877756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-skid brake control system
Assignee: Aisin Corp
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Filing: 1973-07-26
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Granted: 1975-04-15
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Expires: 1993-07-26
Abstract
Abstract An anti-skid brake control system includes a power booster interposed between a master cylinder and a brake pedal, and first and second solenoid valves electrically connected to a computer which generates first and second signals therefrom in response to wheel locking conditions, the second signal of which may be generated a predetermined time after the first signal is terminated whereby the first solenoid valve serves to reduce the hydraulic pressure within the booster upon reception of the first signal from the computer so as to release the brake pressure to the wheels and the second solenoid valve serves to gradually increase the reduced pressure within the booster upon reception of the second signal from the computer so as to recover the brake pressure whereby a substantially ideal anti-skid braking operation can be performed.
Inventors
- 👤 Masami Inada
- 👤 Toshiyuki Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:21
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/50; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633; B60T8/44; B60T8/447
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
255 words
An anti-skid brake control system comprising: wheel means including wheel brake cylinders; a master cylinder hydraulically connected to said wheel brake cylinders; manually operable means operably connected to said master cylinder; a booster interposed between said manually operatable means and said master cylinder including a housing and piston means slidably disposed therewithin and defining first and second chAmbers therein for increasing the brake pressure in said master cylinder in accordance with the pressure difference between said first and second chambers; hydraulic pressure source means for supplying pressure to said first chamber of said booster; a reservoir hydraulically connected to said pressure source; computer means for generating first and second signals therefrom in response to predetermined wheel rotational conditions; and first and second electro-magnetic valve means electrically connected to said computer means; wherein said first electro-magnetic valve means is hydraulically interposed between said first chamber of said booster and said hydraulic pressure source so as to reduce the hydraulic pressure within said first chamber of said booster upon reception of said first signal from said computer means thereby decreasing the brake pressure in said master cylinder, and said second electro-magnetic means is hydraulically interposed independently of said pressure source between said second chamber of said booster and said reservoir so as to gradually decrease the hydraulic pressure within said second chamber of said booster upon reception of said second signal from said computer means at a predetermined time after said first signal has been terminated thereby gradually increasing the decreased brake pressure in said master cylinder.
Claim 2
Dependent Claim
255 words
An anti-skid brake control system comprising: wheel means including wheel brake cylinders; a master cylinder hydraulically connected to said wheel brake cylinders; manually operable means operably connected to said master cylinder; a booster interposed between said manually operatable means and said master cylinder including a housing and piston means slidably disposed therewithin and defining first and second chAmbers therein for increasing the brake pressure in said master cylinder in accordance with the pressure difference between said first and second chambers; hydraulic pressure source means for supplying pressure to said first chamber of said booster; a reservoir hydraulically connected to said pressure source; computer means for generating first and second signals therefrom in response to predetermined wheel rotational conditions; and first and second electro-magnetic valve means electrically connected to said computer means; wherein said first electro-magnetic valve means is hydraulically interposed between said first chamber of said booster and said hydraulic pressure source so as to reduce the hydraulic pressure within said first chamber of said booster upon reception of said first signal from said computer means thereby decreasing the brake pressure in said master cylinder, and said second electro-magnetic means is hydraulically interposed independently of said pressure source between said second chamber of said booster and said reservoir so as to gradually decrease the hydraulic pressure within said second chamber of said booster upon reception of said second signal from said computer means at a predetermined time after said first signal has been terminated thereby gradually increasing the decreased brake pressure in said master cylinder.
Claim 3
Dependent Claim
32 words
An anti-skid brake control system as set forth in claim 1, wherein said booster further comprises valve means disposed within said first chamber and being operatively connected to said manually operable means.
Claim 4
Dependent Claim
22 words
An anti-skid brake control system as set forth in claim 2, wherein said piston means is operatively connected to said master cylinder.
Claim 5
Dependent Claim
42 words
An anti-skid brake control system as set forth in claim 2, wherein said valve means is capable of being moved in unison with said piston means for actuating said master cylinder in the instance of pressure leakage within said hydraulic pressure source.
Claim 6
Dependent Claim
75 words
An anti-skid brake control system as set forth in claim 1, wherein: said second electro-magnetic valve means is hydraulically connected to said reservoir; and orifice means is interposed between said reservoir and said second electro-magnetic valve means, whereby upon reception of said second signal from said computer means, pressurized fluid within said booster is permitted to flow to said reservoir through said orifice means so as to gradually increase said reduced pressure within said booster.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |