US5668740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for detecting a rough road surface
Assignee: Motors Liquidation Co
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Filing: 1994-12-20
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Granted: 1997-09-16
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Expires: 2014-12-20
Abstract
Abstract A method for detecting a rough road surface upon which a vehicle is travelling, such detection being utilized by a crash sensing system for improving its immunity to inadvertent deployment during minor crash incidents. The onset of a crash event is sensed by an on-board accelerometer when the detected vehicle deceleration exceeds a predetermined deceleration threshold value. A rough road measurement is calculated as a function of the vehicle deceleration data and compared to a threshold boundary curve. A value of the rough road measurement exceeding the boundary curve is indicative of a rough road event.
Inventors
- 👤 Jenne-Tai Wang
- 👤 Richard Jay Yun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:49
CPC Classifications
B; B60; B60R; B60R21/00; B60R21/01; B60R21/013; B60R21/0132; B60T; B60T2210/00; B60T2210/10; B60T2210/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A method for detecting a rough road surface upon which a vehicle is traveling, the method comprising: providing a signal responsive to vehicle deceleration; sampling the vehicle deceleration signal at a predetermined sampling rate to obtain discrete values of deceleration; comparing discrete values of deceleration with a deceleration threshold to detect the onset of a crash event; computing absolute values of the discrete values of deceleration; determining difference values as a function of a difference between the absolute values and the discrete values of deceleration; determining rough road measurement values as an integral of the difference values; comparing the rough road measurement values with a predetermined time-dependent boundary curve; and indicating a rough road surface when the rough road measurement value exceeds a corresponding value of the boundary curve for the appropriate time into the crash event.
Claim 2
Independent Claim
137 words
A method for detecting a rough road surface upon which a vehicle is traveling, the method comprising: providing a signal responsive to vehicle deceleration; sampling the vehicle deceleration signal at a predetermined sampling rate to obtain discrete values of deceleration; comparing discrete values of deceleration with a deceleration threshold to detect the onset of a crash event; computing absolute values of the discrete values of deceleration; determining difference values as a function of a difference between the absolute values and the discrete values of deceleration; determining rough road measurement values as an integral of the difference values; comparing the rough road measurement values with a predetermined time-dependent boundary curve; and indicating a rough road surface when the rough road measurement value exceeds a corresponding value of the boundary curve for the appropriate time into the crash event.
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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) | 2000-09-15 | 2001-03-17 | 2001-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-15 | 2005-03-17 | 2005-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-15 | 2009-03-17 | 2009-09-16 | $7700.00 | Window Closed / Lapsed |