Slant transform/signal space crash discriminator
First Claim
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1. In a motor vehicle, a system for triggering a safety device comprising:
- a sensor mounted in said vehicle for generating an analog signal representative of instantaneous vehicle acceleration (deceleration);
means for converting said analog signal to digital acceleration data;
means for transforming said acceleration data to a signal space vector; and
signal space discriminator means responsive to said signal space vector for triggering the safety device when a value calculated from said signal space vector exceeds a threshold value therefor.
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Abstract
A system and method for triggering a vehicle safety device in response to a crash or sudden vehicle deceleration includes conversion of an analog signal generated by an acceleration sensor and representative of instantaneous vehicle acceleration to a digital value and using a ROM lookup table to determine its natural log. An autocorrelation of the log values of the acceleration data is determined and thereafter used to calculate first and second basis vector values. A safety device trigger signal is generated by a signal space discriminator when a value calculated from the first and second basis vector values exceeds a threshold value therefor.
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Citations
19 Claims
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1. In a motor vehicle, a system for triggering a safety device comprising:
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a sensor mounted in said vehicle for generating an analog signal representative of instantaneous vehicle acceleration (deceleration); means for converting said analog signal to digital acceleration data; means for transforming said acceleration data to a signal space vector; and signal space discriminator means responsive to said signal space vector for triggering the safety device when a value calculated from said signal space vector exceeds a threshold value therefor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for triggering a safety device in a motor vehicle, said method comprising the steps of:
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obtaining an analog signal representative of instantaneous vehicle acceleration (deceleration) from a sensor mounted in said vehicle; converting said analog signal to digital data; transforming said digital data to a signal space vector; and triggering the safety device when a value calculated from said signal space vector exceeds a threshold value therefor. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for triggering a safety device in a motor vehicle, said method comprising the steps of:
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obtaining an analog signal representative of instantaneous vehicle acceleration (deceleration) from a sensor mounted in said vehicle; converting said analog signal to digital data; obtaining log values of said digital data; determining an autocorrelation of said log values of said digital data using a lag; calculating first and second basis vector values from said log-correlation; obtaining a signal space vector from two pairs of said first and second basis vector values; obtaining a detector vector corresponding to specific crash profiles; calculating the value of the dot product of said signal space vector with said detector vector; integrating successive values of said dot product of said signal space vector with said detector vector; comparing each of said integrated dot products with a threshold value; and triggering said safety device if said integrated dot product exceeds said threshold value. - View Dependent Claims (16, 17, 18, 19)
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Specification