Patent US3715145A successfully refreshed from Google Patents.
US3715145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic anti-lock brake control system
Assignee: Motors Liquidation Co
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Filing: 1971-09-30
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Granted: 1973-02-06
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Expires: 1991-09-30
Abstract
Abstract The invention utilizes a wheel speed proportional pressure generated by a transmission governor and a vehicle ground speed pressure provided by a vehicle ground speed computer and provides a hydraulic anti-lock brake system including a fluid pressure operated wheel brake, an operator actuated master cylinder, a low speed cutout valve which communicates the master cylinder pressure directly to the wheel brake at vehicle speeds below some predetermined level, a control valve which modulates the governor pressure to provide a control pressure proportional to the amount by which master cylinder pressure exceeds the brake pressure and a clutch modulator which acts at vehicle speeds above the threshold of the low speed cutout valve to provide a brake pressure proportional to the control pressure. The transmission governor is modified to receive the vehicle ground speed pressure and apply a force proportional thereto to the governor valve spool so that during wheel slip the governor pressure is a function of both wheel speed and ground speed, or, in other words, a function of the magnitude of wheel slip.
Inventors
- 👤 J Harned
- 👤 E Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:33
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A vehicle brake control system effective to vary a wheel speed during high level braking to provide a substantially constant ratio of vehicle ground speed to wheel speed and comprising: a master cylinder actuated by the vehicle operator and generating a fluid pressure; a fluid pressure operated wheel brake adapted to provide a braking torque in proportion to the brake pressure acting thereon; a vehicle ground speed computer providing a fluid pressure proportional to the vehicle ground speed; governor means providing a governor pressure as a function of both wheel speed and vehicle ground speed pressure; control valve means acting to modulate the governor pressure to provide a control pressure which is proportional difference between master cylinder pressure and brake pressure; and actuator means including piston means in brake fluid communication with the wheel brake and providing a brake pressure proportional to the control pressure.
Claim 2
Dependent Claim
145 words
A vehicle brake control system effective to vary a wheel speed during high level braking to provide a substantially constant ratio of vehicle ground speed to wheel speed and comprising: a master cylinder actuated by the vehicle operator and generating a fluid pressure; a fluid pressure operated wheel brake adapted to provide a braking torque in proportion to the brake pressure acting thereon; a vehicle ground speed computer providing a fluid pressure proportional to the vehicle ground speed; governor means providing a governor pressure as a function of both wheel speed and vehicle ground speed pressure; control valve means acting to modulate the governor pressure to provide a control pressure which is proportional difference between master cylinder pressure and brake pressure; and actuator means including piston means in brake fluid communication with the wheel brake and providing a brake pressure proportional to the control pressure.
Claim 3
Dependent Claim
145 words
A vehicle brake control system effective to vary a wheel speed during high level braking to provide a substantially constant ratio of vehicle ground speed to wheel speed and comprising: a master cylinder actuated by the vehicle operator and generating a fluid pressure; a fluid pressure operated wheel brake adapted to provide a braking torque in proportion to the brake pressure acting thereon; a vehicle ground speed computer providing a fluid pressure proportional to the vehicle ground speed; governor means providing a governor pressure as a function of both wheel speed and vehicle ground speed pressure; control valve means acting to modulate the governor pressure to provide a control pressure which is proportional difference between master cylinder pressure and brake pressure; and actuator means including piston means in brake fluid communication with the wheel brake and providing a brake pressure proportional to the control pressure.
Claim 4
Dependent Claim
145 words
A vehicle brake control system effective to vary a wheel speed during high level braking to provide a substantially constant ratio of vehicle ground speed to wheel speed and comprising: a master cylinder actuated by the vehicle operator and generating a fluid pressure; a fluid pressure operated wheel brake adapted to provide a braking torque in proportion to the brake pressure acting thereon; a vehicle ground speed computer providing a fluid pressure proportional to the vehicle ground speed; governor means providing a governor pressure as a function of both wheel speed and vehicle ground speed pressure; control valve means acting to modulate the governor pressure to provide a control pressure which is proportional difference between master cylinder pressure and brake pressure; and actuator means including piston means in brake fluid communication with the wheel brake and providing a brake pressure proportional to the control pressure.
Claim 5
Dependent Claim
247 words
A vehicle brake control system effective to vary a wheel speed during high level braking to provide a substantially constant ratio of vehicle ground speed to wheel speed and comprising: a master cylinder actuated by the vehicle operator and generating a fluid pressure; a fluid pressure operated wheel brake adapted to provide a braking torque in proportion to the brake pressure acting thereon; a vehicle ground speed computer providing a fluid pressure proportional to the vehicle ground speed; governor means providing a governor pressure proportional to wheel speed and vehicle ground speed pressure and including a valve spool having a wheel speed driven flyball generated force acting on one end thereof and governor pressure and vehicle ground speed pressure acting on the other end thereof; control valve means acting to modulate the governor pressure to provide a control pressure which is proportional to the difference between master cylinder pressure and brake pressure; and a clutch modulator including a piston sealingly slidable in a bore to pressurize brake fluid in communication with the wheel brake, rotary cam means operatively connected to the piston and determining the position thereof within the bore, a driven power shaft, a clutch device including driving plate means carried on the power shaft and driven plate means carried on the rotary cam means, and piston means engaging the clutch device and acted upon by control pressure to impart rotary torque to the cam means whereby a brake pressure proportional tO control pressure is provided.
Claim 6
Dependent Claim
247 words
A vehicle brake control system effective to vary a wheel speed during high level braking to provide a substantially constant ratio of vehicle ground speed to wheel speed and comprising: a master cylinder actuated by the vehicle operator and generating a fluid pressure; a fluid pressure operated wheel brake adapted to provide a braking torque in proportion to the brake pressure acting thereon; a vehicle ground speed computer providing a fluid pressure proportional to the vehicle ground speed; governor means providing a governor pressure proportional to wheel speed and vehicle ground speed pressure and including a valve spool having a wheel speed driven flyball generated force acting on one end thereof and governor pressure and vehicle ground speed pressure acting on the other end thereof; control valve means acting to modulate the governor pressure to provide a control pressure which is proportional to the difference between master cylinder pressure and brake pressure; and a clutch modulator including a piston sealingly slidable in a bore to pressurize brake fluid in communication with the wheel brake, rotary cam means operatively connected to the piston and determining the position thereof within the bore, a driven power shaft, a clutch device including driving plate means carried on the power shaft and driven plate means carried on the rotary cam means, and piston means engaging the clutch device and acted upon by control pressure to impart rotary torque to the cam means whereby a brake pressure proportional tO control pressure is provided.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |