Patent USRE33557E successfully refreshed from Google Patents.
USRE33557E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-lock brake control system
Assignee: Motors Liquidation Co
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Filing: 1990-06-08
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Granted: 1991-03-19
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Expires: 2010-06-08
Abstract
Abstract A brake control system is described that prevents a wheel lockup condition by identifying the brake pressure that produces the maximum possible braking effort during each brake pressure application period and applying a predetermined fraction of the identified pressure after an incipient wheel lockup condition is sensed. The predetermined fraction provides for adaptive adjustment of the brake pressure if the identified brake pressure is in error until a pressure is applied that produces substantially the maximum possible braking effort.
Inventors
- 👤 Alexander Kade
- 👤 Harland G. Hopkins
- 👤 Mutasim A. Salman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:08
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/58; B60T8/17; B60T8/176; B60T8/1763; B60T8/17636; B60T8/34; B60T8/50; B60T8/5056
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
118 words
A wheel lock control system for limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a road surface, the system comprising: means for determining the tire torque tending to accelerate the wheel during the application of brake pressure; means for storing a valve representative of the brake pressure corresponding in time to the maximum determined tire torque; means for detecting an incipient wheel lockup condition resulting from the valve of slip between the wheel and the road surface exceeding a critical slip value; and means for establishing the brake pressure following a detected incipient wheel lockup condition at a value having a predetermined relationship to the brake pressure represented by the stored value.
Claim 2
Dependent Claim
118 words
A wheel lock control system for limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a road surface, the system comprising: means for determining the tire torque tending to accelerate the wheel during the application of brake pressure; means for storing a valve representative of the brake pressure corresponding in time to the maximum determined tire torque; means for detecting an incipient wheel lockup condition resulting from the valve of slip between the wheel and the road surface exceeding a critical slip value; and means for establishing the brake pressure following a detected incipient wheel lockup condition at a value having a predetermined relationship to the brake pressure represented by the stored value.
Claim 3
Dependent Claim
140 words
A wheel lock control system for limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a road surface, the system comprising: means for determining the tire torque tending to accelerate the wheel during the application of brake pressure; means for storing a value representing the brake pressure corresponding in time to the maximum determined tire torque during periods of application of brake pressure; means for detecting an incipient wheel lockup condition resulting from the value of slip between the wheel and the road surface exceeding a critical slip value; means for lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; and means for reestablishing brake pressure following wheel speed recovery to a value having a predetermined relationship to the brake pressure represented by the stored value.
Claim 4
Dependent Claim
140 words
A wheel lock control system for limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a road surface, the system comprising: means for determining the tire torque tending to accelerate the wheel during the application of brake pressure; means for storing a value representing the brake pressure corresponding in time to the maximum determined tire torque during periods of application of brake pressure; means for detecting an incipient wheel lockup condition resulting from the value of slip between the wheel and the road surface exceeding a critical slip value; means for lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; and means for reestablishing brake pressure following wheel speed recovery to a value having a predetermined relationship to the brake pressure represented by the stored value.
Claim 5
Independent Claim
114 words
The method of limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a roadway comprising the steps of: determining the tire torque tending to accelerate the wheel during the application of brake pressure; storing a value representing the brake pressure corresponding in time to the maximum determined tire torque following each application of brake pressure; detecting an incipient wheel lockup condition resulting from the value of slip between the wheel and the road surface exceeding a critical slip value; and reapplying the brake pressure following a detected incipient wheel lockup condition to a value that is a predetermined relationship to the brake pressure represented by the last stored value.
Claim 6
Independent Claim
114 words
The method of limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a roadway comprising the steps of: determining the tire torque tending to accelerate the wheel during the application of brake pressure; storing a value representing the brake pressure corresponding in time to the maximum determined tire torque following each application of brake pressure; detecting an incipient wheel lockup condition resulting from the value of slip between the wheel and the road surface exceeding a critical slip value; and reapplying the brake pressure following a detected incipient wheel lockup condition to a value that is a predetermined relationship to the brake pressure represented by the last stored value.
Claim 7
Independent Claim
127 words
The method of limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a roadway comprising the steps of: determining the tire torque tending to accelerate the wheel during the application of brake pressure; storing a value representing the brake pressure corresponding in time to the maximum determined tire torque following each application of brake pressure; detecting an incipient wheel lockup condition resulting from the value of slip between the wheel and the road surface exceeding a critical slip value; lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; and reapplying brake pressure following wheel speed recovery to a value that is predetermined relationship to the brake pressure represented by the last stored value.
Claim 8
Independent Claim
127 words
The method of limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a roadway comprising the steps of: determining the tire torque tending to accelerate the wheel during the application of brake pressure; storing a value representing the brake pressure corresponding in time to the maximum determined tire torque following each application of brake pressure; detecting an incipient wheel lockup condition resulting from the value of slip between the wheel and the road surface exceeding a critical slip value; lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; and reapplying brake pressure following wheel speed recovery to a value that is predetermined relationship to the brake pressure represented by the last stored value.
Claim 9
Independent Claim
132 words
A system for controlling the brake applied to the brakes of a wheel traveling over a road surface to limit the wheel slip between the wheel and the road surface, the system comprising, in combination: means for determining the value of tire torque resulting from the tire and road interface; means for storing a value representative of the brake pressure corresponding in time to the maximum determined value of tire torque; means for determining when the value of slip between the tire and road surface exceeds a critical slip value; and means responsive to the determination of a slip value exceeding the critical slip value for reestablishing the brake pressure to a value related to the stored value to establish a wheel slip value producing substantially the peak value of tire torque.
Claim 10
Independent Claim
132 words
A system for controlling the brake applied to the brakes of a wheel traveling over a road surface to limit the wheel slip between the wheel and the road surface, the system comprising, in combination: means for determining the value of tire torque resulting from the tire and road interface; means for storing a value representative of the brake pressure corresponding in time to the maximum determined value of tire torque; means for determining when the value of slip between the tire and road surface exceeds a critical slip value; and means responsive to the determination of a slip value exceeding the critical slip value for reestablishing the brake pressure to a value related to the stored value to establish a wheel slip value producing substantially the peak value of tire torque.
Claim 11
Independent Claim
163 words
A system for controlling the brake pressure applied to the brakes of a wheel traveling over a road surface to limit the wheel slip between the wheel and the road surface, the system comprising, in combination: means for determining the value of tire torque resulting from the tire and road interface; and means for cyclically (A) storing a value representative of the brake pressure corresponding in time to the maximum determined value of tire torque, (B) determining when the value of slip between the tire and road surface exceeds a critical slip value, (C) reestablishing the brake pressure to a value related to the stored value to establish a wheel slip value producing substantially the peak value of tire torque and (D) ramping the brake pressure in direction tending to increase the value of slip between the tire and road surface, whereby the slip between the tire and road surface is maintained substantially at the value resulting in the peak tire torque value.
Claim 12
Independent Claim
163 words
A system for controlling the brake pressure applied to the brakes of a wheel traveling over a road surface to limit the wheel slip between the wheel and the road surface, the system comprising, in combination: means for determining the value of tire torque resulting from the tire and road interface; and means for cyclically (A) storing a value representative of the brake pressure corresponding in time to the maximum determined value of tire torque, (B) determining when the value of slip between the tire and road surface exceeds a critical slip value, (C) reestablishing the brake pressure to a value related to the stored value to establish a wheel slip value producing substantially the peak value of tire torque and (D) ramping the brake pressure in direction tending to increase the value of slip between the tire and road surface, whereby the slip between the tire and road surface is maintained substantially at the value resulting in the peak tire torque value.
Claim 13
Independent Claim
124 words
A method for controlling the brake pressure applied to the brakes of a wheel traveling over a road surface to limit the wheel slip between the wheel and the road surface, the method comprising: determining the value of tire torque resulting from the tire and road interface; storing a value representative of the brake pressure corresponding in time to the maximum determined value of tire torque; determining when the value of slip between the tire and road surface exceeds a critical slip value; and reestablishing the brake pressure following the determination of the value of slip exceeding a critical slip value to a value related to the stored value to establish a wheel slip value producing substantially the peak value of tire torque. .Iadd.
Claim 14
Independent Claim
124 words
A method for controlling the brake pressure applied to the brakes of a wheel traveling over a road surface to limit the wheel slip between the wheel and the road surface, the method comprising: determining the value of tire torque resulting from the tire and road interface; storing a value representative of the brake pressure corresponding in time to the maximum determined value of tire torque; determining when the value of slip between the tire and road surface exceeds a critical slip value; and reestablishing the brake pressure following the determination of the value of slip exceeding a critical slip value to a value related to the stored value to establish a wheel slip value producing substantially the peak value of tire torque. .Iadd.
Claim 15
Independent Claim
95 words
A method of limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a roadway, the method comprising the steps of: detecting an incipient wheel lockup condition; storing a value representing the brake pressure corresponding to a predetermined braking condition between the wheel and the roadway; lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; and reapplying the brake pressure following wheel speed recovery to a value that is a predetermined fraction of the pressure represented by the stored value. .Iaddend. .Iadd.
Claim 16
Independent Claim
95 words
A method of limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a roadway, the method comprising the steps of: detecting an incipient wheel lockup condition; storing a value representing the brake pressure corresponding to a predetermined braking condition between the wheel and the roadway; lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; and reapplying the brake pressure following wheel speed recovery to a value that is a predetermined fraction of the pressure represented by the stored value. .Iaddend. .Iadd.
Claim 17
Independent Claim
108 words
A method of limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a roadway, the method comprising the steps of: detecting an incipient wheel lockup condition; storing a value representing the brake pressure substantially at the time an incipient wheel lockup condition is detected; lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; reapplying the brake pressure following wheel speed recovery to a value that is a predetermined fraction of the pressure represented by the stored value; and ramping the reapplied brake pressure until an incipient wheel lockup condition is again detected. .Iaddend. .Iadd.
Claim 18
Independent Claim
108 words
A method of limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a roadway, the method comprising the steps of: detecting an incipient wheel lockup condition; storing a value representing the brake pressure substantially at the time an incipient wheel lockup condition is detected; lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; reapplying the brake pressure following wheel speed recovery to a value that is a predetermined fraction of the pressure represented by the stored value; and ramping the reapplied brake pressure until an incipient wheel lockup condition is again detected. .Iaddend. .Iadd.
Claim 19
Independent Claim
126 words
A method of limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a roadway, the method comprising the steps of: detecting an incipient wheel lockup condition of the wheel resulting from slip between the wheel and the road surface exceeding a critical slip value; storing a value representing the brake pressure establishing the critical slip between the wheel and the road surface; lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; reapplying the brake pressure following wheel speed recovery to a value that is a predetermined fraction of the pressure represented by the stored value; and ramping the reapplied brake pressure until an incipient wheel lockup condition is again detected. .Iaddend. .Iadd.
Claim 20
Independent Claim
126 words
A method of limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a roadway, the method comprising the steps of: detecting an incipient wheel lockup condition of the wheel resulting from slip between the wheel and the road surface exceeding a critical slip value; storing a value representing the brake pressure establishing the critical slip between the wheel and the road surface; lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; reapplying the brake pressure following wheel speed recovery to a value that is a predetermined fraction of the pressure represented by the stored value; and ramping the reapplied brake pressure until an incipient wheel lockup condition is again detected. .Iaddend. .Iadd.
Claim 21
Dependent Claim
102 words
A wheel lock control system for limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a road surface, the system comprising: means for detecting an incipient wheel lockup condition; means for storing a value representing the brake pressure corresponding to a predetermined braking condition between the wheel and the road surface; means for lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; and means for reestablishing brake pressure following wheel speed recovery to a value that is predetermined fraction of the pressure represented by the stored value. .Iaddend.
Claim 22
Dependent Claim
102 words
A wheel lock control system for limiting the brake pressure applied to the brakes of a vehicle wheel traveling over a road surface, the system comprising: means for detecting an incipient wheel lockup condition; means for storing a value representing the brake pressure corresponding to a predetermined braking condition between the wheel and the road surface; means for lowering the brake pressure in response to a detected incipient wheel lockup condition to allow wheel speed recovery; and means for reestablishing brake pressure following wheel speed recovery to a value that is predetermined fraction of the pressure represented by the stored value. .Iaddend.
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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) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |