US5281009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antilock brake system with closed loop control of hold during release
Assignee: Delco Electronics LLC
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Filing: 1992-08-19
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Granted: 1994-01-25
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Expires: 2012-08-19
Abstract
Abstract An antilock brake controller provides an adaptive pressure hold period that interrupts the release of brake pressure during the pressure release phase of an antilock braking pressure control cycle of a vehicle wheel by holding the brake pressure constant while the wheel slip rate is below a threshold that is adjusted as a predetermined function of wheel slip for the front wheels and as a predetermined function of wheel acceleration for the rear wheels.
Inventors
- 👤 Kevin S. Kidston
- 👤 Jeannine C. Eddy
- 👤 II Jerry J. Queen
- 👤 Jeffrey T. Von Der Vellen
- 👤 Alan J. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:50
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4266; B60T8/17; B60T8/176; B60T8/1763; B60T8/17636
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
186 words
A method of antilock control of the brake pressure applied to a brake of a vehicle wheel traveling over a road surface in a vehicle braking system having a pressure modulator for modulating the applied brake pressure during antilock controlled braking of the wheel, the method comprising the steps of: measuring wheel slip; measuring wheel slip rate of change; and cyclically: (A) detecting an incipient wheel lock condition, (B) controlling brake pressure during a release phase of an ABS pressure cycle in response to the detected incipient wheel lock condition by: (a) controlling the modulator to release brake pressure and (b) interrupting the control of the modulator to release brake pressure, while the measured wheel slip rate of change is less than a threshold level that is a predetermined function of a predetermined wheel parameter, by controlling the modulator to hold the wheel brake pressure, (C) detecting recovery from the wheel lock condition, and (D) controlling brake pressure during an apply phase of the ABS pressure cycle in response to the detected recovery from the wheel lock condition by controlling the modulator to apply brake pressure.
Claim 2
Independent Claim
186 words
A method of antilock control of the brake pressure applied to a brake of a vehicle wheel traveling over a road surface in a vehicle braking system having a pressure modulator for modulating the applied brake pressure during antilock controlled braking of the wheel, the method comprising the steps of: measuring wheel slip; measuring wheel slip rate of change; and cyclically: (A) detecting an incipient wheel lock condition, (B) controlling brake pressure during a release phase of an ABS pressure cycle in response to the detected incipient wheel lock condition by: (a) controlling the modulator to release brake pressure and (b) interrupting the control of the modulator to release brake pressure, while the measured wheel slip rate of change is less than a threshold level that is a predetermined function of a predetermined wheel parameter, by controlling the modulator to hold the wheel brake pressure, (C) detecting recovery from the wheel lock condition, and (D) controlling brake pressure during an apply phase of the ABS pressure cycle in response to the detected recovery from the wheel lock condition by controlling the modulator to apply brake pressure.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the predetermined wheel parameter is the measured wheel slip.
Claim 4
Dependent Claim
24 words
The method of claim 1 further including the step of measuring wheel acceleration and wherein the predetermined wheel parameter is the measured wheel acceleration.
Claim 5
Independent Claim
223 words
A method of antilock control of the brake pressure applied to a brake of a vehicle wheel traveling over a road surface in a vehicle braking system having a pressure modulator for modulating the applied brake pressure during antilock controlled braking of the wheel, the method comprising the steps of: measuring wheel slip; measuring wheel slip rate of change; and cyclically: (A) detecting an incipient wheel lock condition, (B) detecting recovery from the wheel lock condition, (C) initiating an ABS pressure cycle in response to the detected incipient wheel lock condition, the ABS pressure cycle including a pressure release phase and a pressure apply phase, (D) controlling brake pressure during the release phase of the ABS pressure cycle in response to the detected incipient wheel lock condition to allow recovery from the wheel lock condition by: (a) controlling the modulator to release brake pressure and (b) interrupting the control of the modulator to release brake pressure, while the measured wheel slip rate of change is less than a threshold level that is a predetermined function of the measured wheel slip, by controlling the modulator to hold the wheel brake pressure, and (E) controlling brake pressure during the apply phase of the ABS pressure cycle in response to the detected recovery from the wheel lock condition by controlling the modulator to apply brake pressure.
Claim 6
Independent Claim
223 words
A method of antilock control of the brake pressure applied to a brake of a vehicle wheel traveling over a road surface in a vehicle braking system having a pressure modulator for modulating the applied brake pressure during antilock controlled braking of the wheel, the method comprising the steps of: measuring wheel slip; measuring wheel slip rate of change; and cyclically: (A) detecting an incipient wheel lock condition, (B) detecting recovery from the wheel lock condition, (C) initiating an ABS pressure cycle in response to the detected incipient wheel lock condition, the ABS pressure cycle including a pressure release phase and a pressure apply phase, (D) controlling brake pressure during the release phase of the ABS pressure cycle in response to the detected incipient wheel lock condition to allow recovery from the wheel lock condition by: (a) controlling the modulator to release brake pressure and (b) interrupting the control of the modulator to release brake pressure, while the measured wheel slip rate of change is less than a threshold level that is a predetermined function of the measured wheel slip, by controlling the modulator to hold the wheel brake pressure, and (E) controlling brake pressure during the apply phase of the ABS pressure cycle in response to the detected recovery from the wheel lock condition by controlling the modulator to apply brake pressure.
Claim 7
Independent Claim
222 words
A method of antilock control of the brake pressure applied to a brake of a vehicle wheel traveling over a road surface in a vehicle braking system having a pressure modulator for modulating the applied brake pressure during antilock controlled braking of the wheel, the method comprising the steps of: determining wheel slip; determining wheel slip rate of change; and cyclically: (A) detecting an incipient wheel lock condition, (B) controlling brake pressure during a release phase of an ABS pressure cycle in response to the detected incipient wheel lock condition by: (a) controlling the modulator to release brake pressure and (b) interrupting the control of the modulator to release brake pressure, while the measured wheel slip rate of change is less than a threshold level that is a predetermined function of a predetermined wheel parameter for a first interruption of the control of the modulator to release brake pressure and during a predetermined recovery condition of the wheel for subsequent interruptions of the control of the modulator to release brake pressure, by controlling the modulator to hold the wheel brake pressure, (C) detecting recovery from the wheel lock condition, and (D) controlling brake pressure during an apply phase of the ABS pressure cycle in response to the detected recovery from the wheel lock condition by controlling the modulator to apply brake pressure.
Claim 8
Independent Claim
222 words
A method of antilock control of the brake pressure applied to a brake of a vehicle wheel traveling over a road surface in a vehicle braking system having a pressure modulator for modulating the applied brake pressure during antilock controlled braking of the wheel, the method comprising the steps of: determining wheel slip; determining wheel slip rate of change; and cyclically: (A) detecting an incipient wheel lock condition, (B) controlling brake pressure during a release phase of an ABS pressure cycle in response to the detected incipient wheel lock condition by: (a) controlling the modulator to release brake pressure and (b) interrupting the control of the modulator to release brake pressure, while the measured wheel slip rate of change is less than a threshold level that is a predetermined function of a predetermined wheel parameter for a first interruption of the control of the modulator to release brake pressure and during a predetermined recovery condition of the wheel for subsequent interruptions of the control of the modulator to release brake pressure, by controlling the modulator to hold the wheel brake pressure, (C) detecting recovery from the wheel lock condition, and (D) controlling brake pressure during an apply phase of the ABS pressure cycle in response to the detected recovery from the wheel lock condition by controlling the modulator to apply brake pressure.
Claim 9
Dependent Claim
46 words
The method of claim 5 further including the step of measuring wheel acceleration and wherein the predetermined wheel parameter is the measured wheel slip and the predetermined recovery condition of the wheel is one of a predetermined slip rate of change and a predetermined wheel acceleration.
Claim 10
Dependent Claim
31 words
The method of claim 5 further including the step of limiting the duration of the first interruption of the control of the modulator to release brake pressure at a predetermined time.
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) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |