US5746486A
Expired / Lapsed
US
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Brake control system
Assignee: GM Global Technology Operations LLC
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Filing: 1997-08-29
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Granted: 1998-05-05
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Expires: 2017-08-29
Abstract
Abstract A brake control system method according to the steps of: determining driver commanded yaw rate; measuring actual yaw rate; determining a yaw rate error; determining, in response to vehicle conditions, a yaw rate dead band wherein the yaw rate dead band varies with vehicle conditions; comparing the yaw rate error to the dead band; and if the yaw rate error exceeds the dead band, controlling the vehicle responsive to the yaw rate error, wherein yaw rate control only occurs when the yaw rate error exceeds the dead band.
Inventors
- 👤 Ronald Paul
- 👤 Stephen Robert Pastor
- 👤 Michael Douglas Rizzo
- 👤 Duane Edward Bassett
- 👤 Edward John Bedner
- 👤 Douglass L. Carson
- 👤 Hsien Heng Chen
- 👤 Yuen-Kwok Chin
- 👤 Youssef Ahmed Ghoneim
- 👤 Alan James Lee
- 👤 William Chin-Woei Lin
- 👤 Howard Hans Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:45
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1755; G; G05; G05D; G05D1/00; G05D1/08; G05D1/0891; B60T2270/00; B60T2270/30; B60T2270/311
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
A brake control system method according to the steps of: determining driver commanded yaw rate; measuring actual yaw rate; determining a yaw rate error; determining, in response to vehicle conditions, a yaw rate dead band wherein the yaw rate dead band varies with vehicle conditions; comparing the yaw rate error to the dead band; and if the yaw rate error exceeds the dead band, controlling the vehicle responsive to the yaw rate error, wherein yaw rate control only occurs when the yaw rate error exceeds the dead band.
Claim 2
Dependent Claim
88 words
A brake control system method according to the steps of: determining driver commanded yaw rate; measuring actual yaw rate; determining a yaw rate error; determining, in response to vehicle conditions, a yaw rate dead band wherein the yaw rate dead band varies with vehicle conditions; comparing the yaw rate error to the dead band; and if the yaw rate error exceeds the dead band, controlling the vehicle responsive to the yaw rate error, wherein yaw rate control only occurs when the yaw rate error exceeds the dead band.
Claim 3
Dependent Claim
24 words
A brake control system method according to claim 1, wherein the variable dead band is continuously updated responsive vehicle speed and steering wheel angle.
Claim 4
Dependent Claim
51 words
A brake control system method according to claim 1, wherein a first table function is used when the vehicle is in an understeer condition and a second table function is used when the vehicle is in an oversteer condition, wherein the deadband is independently adjusted for the oversteer and understeer conditions.
Claim 5
Dependent Claim
30 words
A brake control system method according to claim 3, wherein the first table function allows a larger deadband for understeer conditions than the second table function allows for oversteer conditions.
Claim 6
Dependent Claim
23 words
A brake control method according to claim 3, wherein the first and second table functions are responsive to vehicle speed and steering angle.
Claim 7
Dependent Claim
119 words
A brake control system comprising: a yaw rate sensor providing an output signal indicative of measured vehicle yaw rate; a plurality of additional sensors for measuring a plurality of vehicle conditions; a microprocessor controller including memory including a first table function having a first output representing an oversteer deadband responsive to the plurality of vehicle conditions and a second table function having a second output representing an understeer deadband responsive to the plurality of vehicle conditions, a command generator responsive to the first and second outputs representing the oversteer and understeer dead bands, the measured vehicle yaw rate and the plurality of vehicle conditions to provide an output command; and at least one actuator responsive to the output command.
Claim 8
Dependent Claim
119 words
A brake control system comprising: a yaw rate sensor providing an output signal indicative of measured vehicle yaw rate; a plurality of additional sensors for measuring a plurality of vehicle conditions; a microprocessor controller including memory including a first table function having a first output representing an oversteer deadband responsive to the plurality of vehicle conditions and a second table function having a second output representing an understeer deadband responsive to the plurality of vehicle conditions, a command generator responsive to the first and second outputs representing the oversteer and understeer dead bands, the measured vehicle yaw rate and the plurality of vehicle conditions to provide an output command; and at least one actuator responsive to the output command.
Claim 9
Dependent Claim
105 words
A brake control system according to claim 6, also comprising: a command interpreter responsive to the plurality of vehicle conditions to provide a desired vehicle yaw rate; means, within the microprocessor controller responsive to the desired vehicle yaw rate and the measured vehicle yaw rate, for determining a yaw rate error, wherein the output command is only applied to the at least one actuator if the vehicle is in an oversteer condition and the yaw rate error is greater than the oversteer dead band or if the vehicle is in an understeer condition and the yaw rate error is greater than the understeer dead band.
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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) | 2001-05-04 | 2001-11-03 | 2002-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-04 | 2005-11-03 | 2006-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-04 | 2009-11-03 | 2010-05-05 | $7700.00 | Window Closed / Lapsed |