Method for detecting a rough road surface
First Claim
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1. 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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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.
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Citations
1 Claim
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1. A method for detecting a rough road surface upon which a vehicle is traveling, the method comprising:
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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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Specification
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Current AssigneeGeneral Motors Corporation (General Motors Company)
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Original AssigneeGeneral Motors Corporation (General Motors Company)
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InventorsYun, Richard Jay, Wang, Jenne-Tai
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Primary Examiner(s)Trammell, James P.
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Assistant Examiner(s)VO, HIEN XUAN
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Application NumberUS08/360,142Time in Patent Office1,001 DaysField of Search364/550, 364/424.05, 364/426.01, 364/566, 340/436, 340/438, 307/10.1, 180/282, 280/735US Class Current701/70CPC Class CodesB60R 21/0132 responsive to vehicle motio...B60T 2210/10 Detection or estimation of ...B60T 2210/14 Rough roads, bad roads, gra...
