Polynomial windowing algorithm for impact responsive activation
First Claim
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1. A method for activating an impact responsive device in a vehicle having an associated single point accelerometer and control module, comprising sensor processing cycle steps of:
- discriminating to provide a prediction on when to activate by using a polynomial windowing function of acceleration and time of a signal at a single point sensor location so the polynomial function for acceleration is not monotonically increasing; and
using a positive spike detector defining a positive spike either to be a positive acceleration preceded by a deceleration or a positive acceleration value above some preset spike magnitude wherein the number of positive spikes is termed a positive spike count, and an above bias delay detector where the above bias delay detector counts the number of consecutive acceleration samples above a bias value and sets a delay proportional to this number where the device will not activate for this amount of time, defined as an above bias delay, for dynamic side impact and soft crash discrimination.
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Abstract
Polynomial functions of acceleration and time are used to develop an air bag activation decision. The polynomial functions include windowing constraints, a spike detector to detect the oscillatory signal in side impacts, and an above bias delay detector to help detect low speed impacts.
11 Citations
4 Claims
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1. A method for activating an impact responsive device in a vehicle having an associated single point accelerometer and control module, comprising sensor processing cycle steps of:
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discriminating to provide a prediction on when to activate by using a polynomial windowing function of acceleration and time of a signal at a single point sensor location so the polynomial function for acceleration is not monotonically increasing; and using a positive spike detector defining a positive spike either to be a positive acceleration preceded by a deceleration or a positive acceleration value above some preset spike magnitude wherein the number of positive spikes is termed a positive spike count, and an above bias delay detector where the above bias delay detector counts the number of consecutive acceleration samples above a bias value and sets a delay proportional to this number where the device will not activate for this amount of time, defined as an above bias delay, for dynamic side impact and soft crash discrimination. - View Dependent Claims (2, 3, 4)
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